JP6870711B2 - Drive device and electric power steering device using this - Google Patents

Description

The present invention relates to a drive device and an electric power steering device using the drive device.

Conventionally, it is known that a motor and an inverter circuit that controls the drive of the motor are arranged close to each other. For example, in Patent Document 1, a housing containing a circuit board on which an inverter circuit is mounted is attached to the outer shell of a compressor.

Japanese Unexamined Patent Publication No. 2003-153552

In FIG. 4 of Patent Document 1, six power control semiconductors are mounted on a circuit board. However, Patent Document 1 does not mention the phase arrangement of the three-phase inverter.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a drive device capable of reducing interphase variation in wiring length from a reference position, and an electric power steering device using the drive device. It is in.

The drive device of the present invention includes a rotary electric machine, a substrate, a heat sink, an intermediate member, a first drive element, a second drive element, a first take-out line, and a second take-out line.
A rotating electric machine having three or more phases has a stator around which the first winding set and the second winding set are wound, a rotor provided so as to be rotatable relative to the stator, and a shaft that rotates with the rotor.
The substrate is provided on one side of the rotary electric machine in the axial direction. The heat sink is provided on the side opposite to the rotating electric machine of the substrate. The intermediate member is provided between the substrate and the heat sink.

The first drive element constituting the first inverter unit for switching the energization of the first winding set is arranged on one surface of the substrate.
The second drive element constituting the second inverter portion for switching the energization of the second winding set is the same surface as the surface on which the first drive element of the substrate is arranged, and is a region in which the first drive element is arranged. It is arranged in the second region, which is the region opposite to the first region, which is the axial center of the rotary electric machine.

The first take-out wire is taken out from the first winding set for each phase and arranged on the substrate.
The second take-out wire is taken out from the second winding set for each phase and arranged on the substrate.
The phase arrangement of the first take-out line and the first drive element and the second take-out line and the second drive element from the reference position side on the substrate is in the reverse order.
The first drive element and the second drive element are surface-mounted on the substrate by dividing the area for each system. The first driving element and the second driving element are arranged side by side for each phase.

In the present invention, the phase arrangement of the first take-out line and the first drive element and the second take-out line and the second drive element are in reverse order from the reference position side. As a result, the variation between the phases of the wiring length on the substrate is reduced.

It is a schematic block diagram which shows the power steering system by 1st Embodiment of this invention. It is a schematic diagram which shows the circuit structure of the drive device by 1st Embodiment of this invention. It is sectional drawing of the drive device by 1st Embodiment of this invention. It is a side view of the drive device by 1st Embodiment of this invention. It is an arrow view of FIG. 4 in the V direction. It is an arrow view of FIG. 4 in the VI direction. It is an exploded perspective view of the drive device according to 1st Embodiment of this invention. It is an exploded perspective view of the drive device according to 1st Embodiment of this invention. It is a side view of the ECU according to 1st Embodiment of this invention. It is an arrow view of FIG. 9 in the X direction. FIG. 9 is an arrow view in the XI direction of FIG. It is sectional drawing of the drive device by 2nd Embodiment of this invention. It is a side view of the drive device by 2nd Embodiment of this invention. It is a side view which removed a part of the cover member of FIG. FIG. 14 is a view taken along the line in the XV direction of FIG. 14 with a part of the cover member removed. It is a top view which shows the surface of the substrate on the frame member side by 2nd Embodiment of this invention. It is a top view which shows the surface of the substrate opposite to the frame member of the 2nd Embodiment of this invention. It is sectional drawing of the drive device by 3rd Embodiment of this invention. It is sectional drawing of the drive device by 4th Embodiment of this invention. It is sectional drawing of the drive device by 5th Embodiment of this invention.

Hereinafter, the drive device and the electric power steering device according to the present invention will be described with reference to the drawings.
(First Embodiment)
The drive device according to the first embodiment of the present invention and the electric power steering device are shown in FIGS. 1 to 11. Hereinafter, in a plurality of embodiments, substantially the same configuration will be designated by the same reference numerals and description thereof will be omitted.

As shown in FIG. 1, the drive device 1 is applied to the electric power steering device 8 for assisting the steering operation by the driver. In the drive device 1, a motor 10 as a rotary electric machine and an ECU 40 as a controller related to drive control of the motor 10 are integrally formed.

FIG. 1 shows the overall configuration of the steering system 100 including the electric power steering device 8. The steering system 100 includes a steering wheel 101 as a steering member, a column shaft 102, a pinion gear 104, a rack shaft 105, wheels 106, an electric power steering device 8, and the like.

The handle 101 is connected to the column shaft 102. The column shaft 102 is provided with a torque sensor 103 that detects the steering torque input by the driver operating the steering wheel 101. A pinion gear 104 is provided at the tip of the column shaft 102, and the pinion gear 104 meshes with the rack shaft 105. A pair of wheels 106 are provided at both ends of the rack shaft 105 via a tie rod or the like.

As a result, when the driver rotates the handle 101, the column shaft 102 connected to the handle 101 rotates. The rotational motion of the column shaft 102 is converted into a linear motion of the rack shaft 105 by the pinion gear 104, and the pair of wheels 106 are steered at an angle corresponding to the displacement amount of the rack shaft 105.

The electric power steering device 8 includes a reduction gear 9 as a power transmission unit and a drive device 1. The electric power steering device 8 motors an auxiliary torque for assisting the steering of the steering wheel 101 based on a signal such as a steering torque acquired from the torque sensor 103 and a vehicle speed acquired from a CAN (Controller Area Network) (not shown). Output from 10 is transmitted to the column shaft 102 via the reduction gear 9. That is, the electric power steering device 8 of the present embodiment is a so-called "column assist" that assists the rotation of the column shaft 102 with the torque generated by the motor 10, but is a so-called "column assist" that assists the drive of the rack shaft 105. It may be "rack assist". In other words, in the present embodiment, the column shaft 102 is the “drive target”, but the rack shaft 105 may be the “drive target”.

Next, the electrical configuration of the electric power steering device 8 will be described with reference to FIG. In FIG. 2, some control lines and the like are omitted in order to avoid complication.
The motor 10 is a three-phase brushless motor, and has a first winding set 13 and a second winding set 14 wound around a stator 12, which will be described later. The first winding set 13 is composed of a U-phase coil 131, a V-phase coil 132, and a W-phase coil 133. The second winding set 14 is composed of a U-phase coil 141, a V-phase coil 142, and a W-phase coil 143.

The ECU 40 includes a first inverter unit 50, a second inverter unit 60, power supply relays 71 and 72, reverse connection protection relays 73 and 74, a control unit 80, a rotation angle sensor 85, and a capacitor 86, all of which are mounted on the substrate 41 described later. 87, choke coil 89 and the like are provided. In this embodiment, the electronic components constituting the ECU 40 are mounted on one substrate 41. As a result, the number of parts can be reduced and the size can be reduced as compared with the case where the ECU 40 is composed of a plurality of substrates.

In the first inverter unit 50, six switching elements (hereinafter, referred to as “SW elements”) 51 to 56 are bridge-connected, and the energization of the first winding group 13 is switched. In the second inverter unit 60, six SW elements 61 to 66 are bridge-connected, and the energization of the second winding set 14 is switched.
The SW elements 51 to 56 and 61 to 66 of the present embodiment are MOSFETs (metal oxide semiconductor field effect transistors), but other elements such as IGBTs may be used.

In the SW elements 51, 52, 53 arranged on the high potential side of the first inverter unit 50, the drain is connected to the positive electrode side of the battery 109 as a power source, and the source is arranged on the low potential side SW elements 54, 55. , 56 connected to the drain. The sources of the SW elements 54, 55, 56 are connected to the negative electrode side of the battery 109 via the current detection elements 57, 58, 59. The connection points between the SW elements 51, 52, 53 on the high potential side and the SW elements 54, 55, 56 on the low potential side are connected to the U-phase coil 131, the V-phase coil 132, and the W-phase coil 133, respectively.

In the SW elements 61, 62, 63 arranged on the high potential side of the second inverter unit 60, the drain is connected to the positive electrode side of the battery 109, and the source is arranged on the low potential side of the SW elements 64, 65, 66. Connected to the drain. The sources of the SW elements 64, 65, 66 are connected to the negative electrode side of the battery 109 via the current detection elements 67, 68, 69. The connection points between the SW elements 61, 62, 63 on the high potential side and the SW elements 64, 65, 66 on the low potential side are connected to the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143, respectively.
In the present embodiment, the SW elements 51 to 56 correspond to the "first drive element", and the SW elements 61 to 66 correspond to the "second drive element". Further, SW elements 51 to 53 and 61 to 63 correspond to "high potential side elements", and SW elements 54 to 56 and 64 to 66 correspond to "low potential side elements".

The current detection elements 57, 58, and 59 are provided on the low potential side of the SW elements 54 to 56 corresponding to each phase of the first winding group 13, and the current applied to each phase of the first winding group 13 is applied. Is detected.
The current detection elements 67, 68, and 69 are provided on the low potential side of the SW elements 64 to 66 corresponding to each phase of the second winding group 14, and the current applied to each phase of the second winding group 14 is applied. Is detected.
The current detection elements 57 to 59 and 67 to 69 of this embodiment are shunt resistors.

The power relay 71 is provided between the battery 109 and the first inverter unit 50, and conducts or cuts off the current between the battery 109 and the first inverter unit 50. The power relay 72 is provided between the battery 109 and the second inverter unit 60, and conducts or cuts off the current between the battery 109 and the second inverter unit 60.

The reverse connection protection relay 73 is provided between the power supply relay 71 and the first inverter unit 50. The reverse connection protection relay 74 is provided between the power supply relay 72 and the second inverter unit 60. The reverse connection protection relays 73 and 74 are connected so that the direction of the parasitic diode is opposite to that of the power supply relays 71 and 72 to prevent the reverse current from flowing when the battery 109 is connected in the opposite direction, and the ECU 40 To protect.
In the present embodiment, the power supply relays 71 and 72 and the reverse connection protection relays 73 and 74 are all MOSFETs, but other elements such as IGBTs may be used. In this embodiment, the power supply relays 71 and 72 correspond to "relays".

The control unit 80 includes a microcomputer 81, an integrated circuit component such as ASIC 82, and the like.
The microcomputer 81 calculates a command value related to energization of the first winding group 13 and the second winding group 14 based on signals from the torque sensor 103, the rotation angle sensor 85, and the like.
The ASIC 82 is composed of a pre-driver, a signal amplification unit, a regulator, and the like. The pre-driver generates a drive signal based on the command value, and outputs the generated drive signal to the first inverter unit 50 and the second inverter unit 60. Specifically, the pre-driver outputs the generated drive signal to the gates of the SW elements 51-56 and 61-66. By switching the SW elements 51 to 56 and 61 to 66 according to the drive signal, the first inverter section 50 and the second inverter section 60 respond to the command values for the first winding set 13 and the second winding set 14. Alternating current is energized. As a result, the motor 10 is driven.
The signal amplification unit amplifies the detection signals (voltages across the ends) of the current detection elements 57 to 59 and 67 to 69 and the detection values of the rotation angle sensor 85, and outputs them to the microcomputer 81. The regulator is a stabilization circuit that stabilizes the voltage supplied to the microcomputer 81 and the like.

The rotation angle sensor 85 is composed of a magnetic detection element, and detects the rotation angle of the rotor 15 by detecting a rotating magnetic field caused by rotation of a magnet 18 provided at the other end 162 of the shaft 16 described later.

The capacitor 86 is connected in parallel with the first inverter unit 50. The capacitor 87 is connected in parallel with the second inverter unit 60. In the present embodiment, the capacitors 86 and 87 are aluminum electrolytic capacitors and are provided on the inverter portions 50 and 60 of the relays 71 to 74. Further, the choke coil 89 is connected between the battery 109 and the positive electrode side of the capacitors 86 and 87. In the present embodiment, the choke coil 89 is provided on the battery 109 side of the relays 71 to 74.
The capacitors 86, 87 and the choke coil 89 form a filter circuit to reduce noise transmitted from other devices sharing the battery 109 and reduce noise transmitted from the drive device 1 to other devices supplying the battery 109. .. Further, the capacitors 86 and 87 assist the power supply to the first inverter unit 50 and the second inverter unit 60 by storing electric charges.

In the present embodiment, the first inverter unit 50, the power supply relay 71, the reverse connection protection relay 73, and the capacitor 86 provided corresponding to the first winding set 13 are referred to as the first system 201. Further, the second inverter unit 60, the power supply relay 72, the reverse connection protection relay 74, and the capacitor 87 provided corresponding to the second winding set 14 are referred to as the second system 202. That is, the motor 10 is driven and controlled by a plurality of systems (two systems in this embodiment).

Next, the structure of the drive device 1 will be described with reference to FIGS. 3 to 11. Hereinafter, the axial direction of the motor 10 is simply referred to as “axial direction”, and the radial direction of the motor 10 is simply referred to as “diameter direction”. Note that FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
As shown in FIGS. 3 to 8, the drive device 1 includes a motor 10, a frame member 20, an ECU 40, a cover member 90, and the like.
As shown in FIG. 3, the motor 10 includes a motor case 11, a stator 12, a first winding group 13, a second winding group 14, a rotor 15, a shaft 16, and the like.

The motor case 11 has a bottom portion 111 and a tubular portion 114, and is formed in a bottomed tubular shape by, for example, a metal such as aluminum. The motor case 11 of this embodiment is made of aluminum, and its surface is anodized. The motor case 11 is arranged so that the bottom portion 111 is on the opposite side to the ECU 40 and the opening side is on the ECU 40 side. In the present embodiment, the tubular portion 114 corresponds to the “cylindrical portion of the rotary electric machine”, and the region where the tubular portion 114 is projected in the axial direction is referred to as the “motor region”.
A shaft hole 112 through which one end 161 of the shaft 16 is inserted is formed at substantially the center of the bottom portion 111. Further, a bearing 166 is fitted to the bottom portion 111.

On the opening side of the tubular portion 114, a fixing portion 116 for fixing the frame member 20 is formed so as to project outward in the radial direction. A screw hole 117 is formed in the fixing portion 116. The fixing portions 116 of the present embodiment are provided at three locations at equal intervals.

The stator 12 has a laminated portion formed by laminating thin plates of magnetic materials such as iron, and an insulator formed on the axially outer side of the laminated portion, and is fixed to the inside of the motor case 11. The number of thin plates used for the laminated portion of the stator 12 can be changed according to the output required for the motor 10. Thereby, by changing the length in the axial direction, the output of the motor 10 can be changed without changing the size in the radial direction.

The first winding set 13 and the second winding set 14 are wound around the insulator of the stator 12. From the first winding set 13, the first motor line 135 is taken out for each phase. A second motor line 145 is taken out from the second winding set 14 for each phase. The motor wires 135 and 145 are taken out from the motor case 11 to the ECU 40 side (see FIG. 7).
In the present embodiment, the first motor line 135 corresponds to the “first take-out line” and the second motor line 145 corresponds to the “second take-out line”.

The rotor 15 has a rotor core 151 and a permanent magnet 152. The rotor core 151 is formed in a substantially cylindrical shape by, for example, a magnetic material such as iron, and is provided inside the stator 12 in the radial direction so as to be coaxial with the stator 12. The permanent magnet 152 is provided on the outer side in the radial direction of the rotor core 151, and is configured such that the north pole and the south pole alternate.

The shaft 16 is formed in a rod shape by, for example, metal, and is fixed to the center of the axis of the rotor core 151. The shaft 16 is rotatably supported by being supported by a bearing 166 provided on the bottom 111 of the motor case 11 and a bearing 167 provided on the frame member 20. As a result, the shaft 16 can rotate together with the rotor 15. An air gap is formed between the outer wall of the rotor 15 and the inner wall of the stator 12.

One end 161 of the shaft 16 is inserted into a shaft hole 112 formed in the bottom 111 of the motor case 11 and projects to the outside of the motor case 11. One end 161 of the shaft 16 is provided with an output end (not shown) connected to the reduction gear 9 (see FIG. 1). As a result, the torque generated by the rotation of the rotor 15 and the shaft 16 is output to the column shaft 102 via the reduction gear 9.
The other end 162 of the shaft 16 is provided with a magnet holding portion 17 for holding the magnet 18.

As shown in FIGS. 3 and 7, the frame member 20 is formed of a metal having good thermal conductivity such as aluminum, and is inserted inside the tubular portion 114 in the radial direction so as to close the opening side of the motor case 11. Will be done. Here, the surface of the frame member 20 on the motor 10 side is referred to as the motor side end surface 21, and the surface on the ECU 40 side is referred to as the ECU side end surface 31.

A shaft hole 23 is formed at substantially the center of the frame member 20. The other end 162 side of the shaft 16 is inserted into the shaft hole 23. As a result, the magnet 18 provided at the other end 162 of the shaft 16 is exposed to the ECU 40 side. Further, a bearing 167 is fitted to the frame member 20.
Further, the frame member 20 is formed with a motor wire insertion hole 24 through which the motor wire 135 is inserted and a motor wire insertion hole 25 through which the motor wire 145 is inserted. As a result, the motor lines 135 and 145 are taken out to the ECU 40 side.

The frame member 20 is formed with a fixing portion 26 that projects radially outward at a location corresponding to the fixing portion 116 (three locations in the present embodiment). A through hole 27 is formed in the fixed portion 26. The frame fixing screw 38 is inserted into the through hole 27 and screwed into the screw hole 117. As a result, the frame member 20 is fixed to the motor case 11.

An O-ring groove 29 is formed on the radial outer side of the frame member 20 and on the bottom 111 side of the fixing portion 26, and the O-ring 39 is fitted between the O-ring groove 29 and the tubular portion 114. This prevents water droplets and the like from entering the inside of the motor 10 from between the motor case 11 and the frame member 20.
A substrate fixing portion 32, relay accommodating chambers 33 and 34, an ASIC accommodating chamber 35, a terminal relief groove 36, and an adhesive groove 37 are formed on the ECU side end surface 31 of the frame member 20.

As shown in FIGS. 3 and 7 to 11, the ECU 40 is provided on the opposite side of the frame member 20 from the motor 10 so as to be substantially coaxial with the motor 10 and substantially within the motor region.
The ECU 40 has a substrate 41 on which various electronic components are mounted.
The substrate 41 is formed in a shape that fits within the motor region. In the present embodiment, the frame member 20 is formed in a shape that fits inside the adhesive groove 37 formed on the ECU side end surface 31 in the radial direction. That is, in the present embodiment, the SW elements 51 to 56, 61 to 66 mounted on the substrate 41 and constituting the ECU 40, the current detection elements 57 to 59, 67 to 69, the capacitors 86, 87, and the choke coil 89 are motors. It fits within the area.
Here, the surface of the substrate 41 on the motor 10 side is referred to as the heat generating element mounting surface 42, and the surface on the side opposite to the motor 10 is referred to as the electronic component mounting surface 43. In this embodiment, the heat generating element mounting surface 42 corresponds to "one surface".

As shown in FIGS. 8 and 10, the heating element mounting surface 42 has SW elements 51 to 56, 61 to 66, current detection elements 57 to 59, 67 to 69, power supply relays 71 and 72, and reverse connection protection relay 73. , 74, ASIC82, rotation angle sensor 85, and the like are surface-mounted. In FIG. 10, the rotation angle sensor 85 is omitted. Further, in FIG. 11, the region where the mold portion of the ASIC 82 is arranged is shown by a broken line.
The rotation angle sensor 85 is mounted at a position substantially centered on the heat generating element mounting surface 42 and facing the magnet 18 exposed from the frame member 20. Here, assuming that the axis of the shaft 16 and the extension of the axis are the axis center O of the motor 10, the rotation angle sensor 85 is mounted on the axis center O of the heat generating element mounting surface 42 (see FIG. 3).

In the first region R1 on which the SW elements 51 to 56 and the current detection elements 57 to 59 constituting the first inverter unit 50 are mounted, the SW elements 61 to 66 and the current detection elements 67 to 69 constituting the second inverter unit 60 are mounted. Is arranged on the opposite side of the shaft center O of the motor 10 from the second region R2 on which the motor 10 is mounted. In the present embodiment, the SW elements 51 to 56 and the SW elements 61 to 66 are arranged line-symmetrically with a straight line passing through the axial center O of the motor 10 interposed therebetween.

Further, assuming that the region including the first region R1, the second region R2, and the axis center O of the motor 10 is the drive element region R3, the power supply relays 71, 72, the reverse connection protection relays 73, 74, and the ASIC 82 are the drive element regions. It is provided on the outside of R3 and on the opposite side of the drive element region R3.

A motor wire insertion portion 44 is formed outside the first region R1 in the radial direction. The motor wire 135 is inserted through the motor wire insertion portion 44. Further, a motor wire insertion portion 45 is formed outside the second region R2 in the radial direction. The motor wire 145 is inserted through the motor wire insertion portion 45.
In the present embodiment, the regions R1 to R3 are shown as rectangular regions, but depending on the mounting locations of the SW elements 51 to 56, 61 to 66 and the current detection elements 57 to 59, 67 to 69, for example, of each element. It may be defined in any way, such as an area other than the rectangle defined by the outer edge.

Further, SW elements 54 to 56 connected to the low potential side are arranged outside the SW elements 51 to 53 connected to the high potential side, and current detection elements 57 to 59 are further arranged outside the SW elements 54 to 56 connected to the low potential side. Similarly, SW elements 64 to 66 connected to the low potential side are arranged outside the SW elements 61 to 63 connected to the high potential side, and current detection elements 67 to 69 are further arranged outside the SW elements 64 to 66 connected to the low potential side. ..

Heat conduction of copper or the like to the SW elements 51 to 56, 61 to 66 mounted on the heat generating element mounting surface 42, the power supply relays 71 and 72, the reverse connection protection relays 73 and 74, and the surface of the ASIC 82 on the frame member 20 side. A heat-dissipating slag formed of a good material is formed. Further, the SW elements 51 to 56, 61 to 66, the current detection elements 57 to 59, 67 to 69, the power supply relays 71 and 72, the reverse connection protection relays 73 and 74, and the ASIC 82 are frame members via a heat radiation gel (not shown). It contacts the end surface 31 on the ECU side of 20 in a state where heat can be dissipated. As a result, the heat generated by the SW elements 51 to 56, 61 to 66, the current detection elements 57 to 59, 67 to 69, the power supply relays 71 and 72, the reverse connection protection relays 73 and 74, and the ASIC 82 dissipates heat. The heat is dissipated to the frame member 20 via the route. In addition, in FIG. 3 and the like, the ASIC 82 and the frame member 20 appear to be separated from each other because the heat radiation gel is omitted.
That is, in the present embodiment, the SW elements 51 to 56, 61 to 66, the current detection elements 57 to 59, 67 to 69, the power supply relays 71 and 72, the reverse connection protection relays 73 and 74, and the ASIC 82 are the heat generating elements 70. Configure.

The power supply relays 71 and 72, which are composed of SW elements 51 to 56 and 61 to 66 and elements having a larger physique than the reverse connection protection relays 73 and 74, are relays formed on the ECU side end surface 31 of the frame member 20. It is housed in the containment chambers 33 and 34. Further, the ASIC 82 composed of SW elements 51 to 56, 61 to 66 and elements having a larger physique than the reverse connection protection relays 73 and 74 is provided in the ASIC accommodation chamber 35 formed in the ECU side end surface 31 of the frame member 20. Be housed.

In the present embodiment, the frame member 20 has a function as an outer shell of the motor 10, a function of holding the ECU 40, and a function of a heat sink that dissipates heat of the heat generating element 70. As a result, the number of parts can be reduced and the physique of the entire device can be reduced as compared with the case where the heat sink is separately provided.

Here, the phase arrangement of the motor lines 135 and 145 and the inverter units 50 and 60 will be described. In the present embodiment, the wiring pattern of the substrate 41 connected to the drains of the power relays 71 and 72 is schematically shown by a alternate long and short dash line in FIG. 10, and is designated as a power supply region Rin. The power supply region Rin is outside the drive element region R3 including the first region R1, the second region R2, and the shaft center O of the motor 10, and the power from the battery 109 is supplied to the first inverter unit 50 and the second. This is an area including a wiring pattern supplied to the inverter unit 60.
In the present embodiment, the power supply area Rin corresponds to the “reference position”.

As shown in FIGS. 7 and 10, the first motor wire 135 includes a first U-phase motor wire 136 connected to the U-phase coil 131, a first V-phase motor wire 137 connected to the V-phase coil 132, and W. It is composed of a first W phase motor wire 138 connected to the phase coil 133. In the present embodiment, the first U-phase motor wire 136, the first V-phase motor wire 137, and the first W-phase motor wire 138 are arranged in this order from the power supply region Rin side, and are inserted into the motor wire insertion portion 44 of the substrate 41. .. In the present embodiment, the first U-phase motor wire 136, the first V-phase motor wire 137, and the first W-phase motor wire 138 are arranged on the substrate 41 outside the current detection elements 57 to 59 and in a straight line. Will be done. Further, on the substrate 41, the distance between the first U-phase motor wire 136 and the first V-phase motor wire 137 is equal to the distance between the first V-phase motor wire 137 and the first W-phase motor wire 138. That is, the 1st U phase motor wire 136 and the 1st W phase motor wire 138 are arranged symmetrically with respect to the 1st V phase motor wire 137.

The second motor wire 145 is connected to the second U-phase motor wire 146 connected to the U-phase coil 141, the second V-phase motor wire 147 connected to the V-phase coil 142, and the W-phase coil 143. It is composed of 2W phase motor wire 148. In the present embodiment, the second W phase motor wire 148, the second V phase motor wire 147, and the second U phase motor wire 146 are arranged in this order from the power supply region Rin side, and are inserted into the motor wire insertion portion 45 of the substrate 41. .. In the present embodiment, the second U-phase motor wire 146, the second V-phase motor wire 147, and the second W-phase motor wire 148 are arranged on the substrate 41 outside the current detection elements 67 to 69 and in a straight line. Will be done. Further, on the substrate 41, the distance between the second U-phase motor line 146 and the second V-phase motor line 147 is equal to the distance between the second V-phase motor line 147 and the second W-phase motor line 148. That is, the second U-phase motor wire 146 and the second W-phase motor wire 148 are arranged symmetrically with respect to the second V-phase motor wire 147.

In the present embodiment, the first U-phase motor wire 136 and the second U-phase motor wire 146 are arranged point-symmetrically with respect to the axis center O of the motor 10. Similarly, the first V-phase motor wire 137 and the second V-phase motor wire 147 are arranged point-symmetrically with respect to the axis center O of the motor 10, and the first W-phase motor wire 138 and the second W-phase motor wire 148 are the motor 10. It is arranged point-symmetrically with respect to the axis center O of.

As a result, the magnetic flux leakage from the first motor wire 135 and the magnetic flux leakage from the second motor wire 145 cancel each other out, so that the influence of the magnetic flux leakage in the rotation angle sensor 85 mounted on the axis center O of the motor 10 is reduced. can do. Here, "symmetrical" means that a manufacturing error is allowed as long as the magnetic flux leakage can be offset.
The distance between the 1st U phase motor wire 136, the 1st V phase motor wire 137, and the 1st W phase motor wire 138 is arranged so as to be as small as possible within a range in which the motor wires do not contact each other, thereby preventing magnetic flux leakage. It can be further reduced. The same applies to the second motor line 145.

Like the first motor line 135, the first inverter unit 50 is arranged in the order of U phase, V phase, and W phase from the power supply region Rin side. Specifically, the SW elements 51, 52, and 53 connected to the high potential side are arranged in the order of the U-phase SW element 51, the V-phase SW element 52, and the W-phase SW element 53 from the power supply region Rin side. Will be done. Further, the SW elements 54, 55, 56 connected to the low potential side are arranged in the order of the U-phase SW element 54, the V-phase SW element 55, and the W-phase SW element 56 from the power supply region Rin side. .. Similarly, the current detection elements 57, 58, and 59 are the current detection element 57 that detects the current of the U-phase coil 131 and the current detection elements 58 and W-phase that detect the current of the V-phase coil 132 from the power supply region Rin side. The current detection elements 58 that detect the current of the coil 133 are arranged in this order.

Like the second motor line 145, the second inverter unit 60 is arranged in the order of W phase, V phase, and U phase from the power supply region Rin side. Specifically, the SW elements 61, 62, and 63 connected to the high potential side are arranged in the order of the W phase SW element 63, the V phase SW element 62, and the U phase SW element 61 from the power supply region Rin side. Will be done. Further, the SW elements 64, 65, 66 connected to the low potential side are arranged in the order of the W phase SW element 66, the V phase SW element 65, and the U phase SW element 64 from the power supply region Rin side. To. Similarly, the current detection elements 67, 68, and 69 are the current detection element 69 that detects the current of the W-phase coil 143 and the current detection elements 68 and U-phase that detect the current of the V-phase coil 142 from the power supply region Rin side. The current detection elements 67 that detect the current of the coil 141 are arranged in this order.

Here, for the U phase, the sum of the wiring length from the power supply area Rin to the motor line 136 and the wiring length from the power supply area Rin to the motor line 146 is defined as the U phase wiring length. Similarly, for the V phase, the sum of the wiring length from the power supply area Rin to the motor line 137 and the wiring length from the power supply area Rin to the motor line 147 is defined as the V phase wiring length. For the W phase, the sum of the wiring length from the power supply area Rin to the motor line 138 and the wiring length from the power supply area Rin to the motor line 148 is defined as the W phase wiring length.

In the present embodiment, the first system 201 is arranged in the order of U phase, V phase, and W phase from the power supply region Rin side, and the second system 202 is W phase, V phase, and U phase from the power supply region Rin side. Are arranged in the order of. In other words, in the first system 201 and the second system 202, it can be considered that the arrangement of the energized phases from the power supply region Rin side is in the reverse order. Further, in the present embodiment, the distance from the center of the power supply region Rin to the center of the first region R1 and the distance from the center of the power supply region Rin to the center of the second region R2 are substantially equal.

Therefore, the variation in the U-phase wiring length, the V-phase wiring length, and the W-phase wiring length is small. In particular, the SW elements 51 to 56 and the current detection elements 57 to 59 are symmetrically arranged, and the SW elements 61 to 66 and the current detection elements 67 to 69 are symmetrically arranged to form the wiring pattern on the substrate 41 symmetrically and the first motor. By arranging the wire 135 and the second motor wire 145 symmetrically, it is possible to further reduce variations in the U-phase wiring length, the V-phase wiring length, and the W-phase wiring length. By reducing the variation in the wiring length, it is possible to reduce the variation between the phases of the wiring impedance.

Further, the phase arrangement of the first inverter unit 50 and the first motor line 135 is the same, and the SW elements 51 to 53 on the high potential side and the SW elements on the low potential side are on the low potential side from the axis center O side toward the outside of the substrate 41 for each phase. SW elements 54 to 56, current detection elements 57 to 59, and motor lines 136 to 138 are arranged in this order. In each of the SW elements 51 to 56, a drain is formed on the surface on the substrate 41 side, and the wiring pattern connected to the drain of the SW elements 54 to 56 on the low potential side is connected to the motor wire 135. Therefore, by arranging the SW elements 54 to 56 on the low potential side outside the SW elements 51 to 53 on the high potential side, the substrate is compared with the case where the SW elements 51 to 53 on the high potential side are arranged outside. Wiring in 41 becomes easy.
The same applies to the second inverter unit 60 and the second motor line 145.

As shown in FIGS. 7 and 11 and the like, a microcomputer 81, capacitors 86 and 87, a choke coil 89 and the like are mounted on the electronic component mounting surface 43.
The microcomputer 81 is mounted on the back side of the area where the ASIC 82 is mounted, at least partially overlapping.

The capacitor 86 is mounted on the back side of the first region R1 on which the SW elements 51 to 56 constituting the first inverter section 50 are mounted, and at least a part thereof overlaps. Further, the capacitor 87 is mounted on the back side of the second region R2 on which the SW elements 61 to 66 constituting the second inverter unit 60 are mounted, and at least a part thereof overlaps. By arranging the capacitors 86 and 87 on the back side of the inverter units 50 and 60, the noise reduction effect is enhanced.

In the present embodiment, by mounting the capacitors 86, 87 and the choke coil 89, which are relatively large electronic components, on the electronic component mounting surface 43 side, the substrate 41 and the frame member 20 can be arranged in close proximity to each other. is there. As a result, the heat of the heat generating element 70 mounted on the heat generating element mounting surface 42 side can be dissipated to the back surface of the frame member 20.

On the electronic component mounting surface 43, a motor wire connecting portion 46 formed of a metal having good conductivity or the like is provided at a position where the motor wire insertion portions 44, 45 are formed. The motor wire connecting portion 46 has a press-fitting portion, and when the motor wires 135 and 145 are press-fitted into the press-fitting portion, the motor wires 135 and 145 and the substrate 41 are electrically connected by press fitting.

A hole 48 is formed at a portion of the substrate 41 corresponding to the substrate fixing portion 32. The substrate fixing screw 49 (see FIGS. 7 and 8) is inserted into the hole 48 and screwed into the substrate fixing portion 32 of the frame member 20. As a result, the substrate 41 is fixed to the frame member 20.

As shown in FIGS. 3 to 8, the cover member 90 has a cover main body 91, a power supply connector 96, and a signal connector 97, and is formed so as to cover the electronic component mounting surface 43 side of the substrate 41. ..
An insertion portion 921 is formed at the end of the peripheral wall 92 of the cover body 91. The insertion portion 921 is inserted into the adhesive groove 37 of the frame member 20 and fixed with an adhesive. This prevents water droplets and the like from entering between the frame member 20 and the cover member 90.

A capacitor accommodating portion 93 is formed at substantially the center of the cover body 91. The capacitor accommodating portion 93 is formed so as to project to the side opposite to the motor 10 and accommodates the capacitors 86 and 87. A breathing hole 94 is formed in the capacitor accommodating portion 93. The breathing hole 94 is closed by the filter member 95. The filter member 95 is made of a material that does not allow water to pass through but allows air to pass through. As a result, the pressure change inside the drive device 1 due to the temperature change is suppressed.

The power supply connector 96 and the signal connector 97 (hereinafter, appropriately referred to as “connectors 96, 97”) are formed so as to project from the cover main body 91 to the side opposite to the motor 10. In this embodiment, the connectors 96 and 97 are integrally formed with the cover body 91.
The power supply connector 96 has an opening 961 formed at an end opposite to the motor 10, and is formed so that a harness (not shown) connected to the battery 109 can be connected from the axial end side. Further, the power supply connector 96 has a power supply connector terminal 962 connected to the substrate 41. The power supply connector terminal 962 is inserted into the terminal insertion hole 965 formed in the substrate 41, and is connected to the substrate 41 by solder or the like. As a result, the ECU 40 is connected to the battery 109.

In the signal connector 97, an opening 971 is formed at an end opposite to the motor 10, and a harness (not shown) can be connected from the opening 971. In the present embodiment, two signal connectors 97 are formed, one of the signal connectors 97 is connected to a harness connected to the torque sensor 103, and the other signal connector 97 is connected to the CAN. Harness is connected. Further, the signal connector 97 has a signal connector terminal 972 connected to the substrate 41. The signal connector terminal 972 is inserted into the terminal insertion hole 975 formed in the substrate 41 and is connected to the substrate 41 by solder or the like. As a result, the information from the torque sensor 103 and the information from the CAN are input to the ECU 40.

The tips of the power supply connector terminal 962 and the signal connector terminal 972 (hereinafter, appropriately referred to as "terminals 962 and 972") are inserted into the terminal relief groove 36 formed in the ECU side end surface 31 of the frame member 20, and the terminal 962. , 972 and the frame member 20 are configured so as not to be short-circuited.

As described in detail above, the drive device 1 of the present embodiment includes the motor 10, the substrate 41, the SW elements 51 to 56, the SW elements 61 to 66, the first motor line 135, and the second motor line 145. And.
The motor 10 has a stator 12 around which the first winding set 13 and the second winding set 14 are wound, a rotor 15 provided so as to be rotatable relative to the stator 12, and a shaft 16 that rotates together with the rotor 15. It is a three-phase motor.

The substrate 41 is provided on one side of the motor 10 in the axial direction.
The SW elements 51 to 56 constituting the first inverter unit 50 for switching the energization of the first winding set 13 are arranged on the heat generating element mounting surface 42 which is one surface of the substrate 41.

The SW elements 61 to 66 constituting the second inverter unit 60 for switching the energization of the second winding set 14 are the same surfaces as the surfaces on which the SW elements 51 to 56 of the substrate 41 are mounted, and the SW elements 51 to 56 are mounted. It is arranged in the first region R1 which is the region where the 56 is mounted and the second region R2 which is the region opposite to the shaft center O of the motor 10.

The first motor wire 135 is taken out from the first winding set 13 for each phase and arranged on the substrate 41.
The second motor line 145 is taken out from the second winding set 14 for each phase and arranged on the substrate 41.

The first motor line 135 and SW elements 51 to 56 and the second motor line 145 and SW elements 61 to 66 are arranged in reverse order from the power supply region Rin side on the substrate 41.
In other words, assuming that the U phase is the first phase, the V phase is the second phase, and the W phase is the third phase, the first motor line 135 and the SW elements 51 to 56 are the first phase from the power supply region Rin side. (U phase), second phase (V phase), and third phase (W phase) are arranged in this order, and the second motor line 145 and SW elements 61 to 66 are arranged in the order of (U phase), second phase (V phase), and third phase (W phase) from the power supply region Rin side. The phases are arranged in the order of phase (W phase), second phase (V phase), and first phase (U phase).

In the present embodiment, the first motor line 135 and SW elements 51 to 56 according to the first system 201 and the second motor line 145 and SW elements 61 to 66 according to the second system are on the reference position side (this embodiment). In, the phase arrangement from the power supply region Rin side) is in the reverse order. As a result, the variation between the phases of the wiring length from the reference position on the substrate 41 is reduced.

The reference position is outside the drive element region R3, which is a region including the first region R1, the second region R2, and the axis center O of the motor 10, and the power from the battery 109 is supplied to the first inverter section 50 and the second inverter. It is a power supply area Rin which is an area including a wiring pattern to be supplied to the unit 60. That is, in the present embodiment, the first motor line 135 and the SW elements 51 to 56 and the second motor line 145 and SW 61 to 66 are arranged in reverse order from the power supply region Rin side. As a result, the variation between the phases of the wiring length in the substrate 41 from the power supply region Rin to the motor line 135 and 145 is reduced, so that the variation in the impedance of each phase can be reduced.

The drive device 1 further includes power relays 71 and 72 capable of switching the conduction or interruption of the current energized between the battery 109 and the first inverter unit 50 or the second inverter unit 60. The power relays 71 and 72 are mounted in the power supply region Rin of the heat generating element mounting surface 42, which is the same surface as the surface on which the SW elements 51 to 56 and 61 to 66 are arranged.
By arranging the power relays 71 and 72 in the power supply area Rin, wiring on the board 41 becomes easy, and the mounting area of the board 41 can be effectively utilized.

The drive device 1 further includes a frame member 20 provided between the motor 10 and the substrate 41.
The SW elements 51 to 56 and 61 to 66 are mounted on the heat generating element mounting surface 42, which is the surface of the substrate 41 on the frame member 20 side, so that heat can be dissipated from the frame member 20. That is, the frame member 20 has both a function as an outer shell of the motor 10 and a function as a heat sink. As a result, the number of parts can be reduced and the physique of the drive device 1, particularly the physique in the axial direction, can be reduced as compared with the case where a heat sink is separately provided.
The first motor line 135 is connected to the substrate 41 on the radial outer side of the first region R1. The second motor line 145 is connected to the substrate 41 on the radial outer side of the second region R2. As a result, the mounting area of the substrate 41 can be effectively utilized.

The drive device 1 further includes current detection elements 57 to 59 and 67 to 79 for detecting the current applied to each phase of the first winding set 13 or the second winding set 14. The current detection elements 57 to 59 and 67 to 79 are located between the SW elements 51 to 56 and the first motor line 135 on the same surface as the surface on which the SW elements 51 to 56 and 61 to 66 are mounted on the substrate 41, or , SW elements 61-66 and the second motor line 145.
Thereby, the current applied to each phase of the first winding group 13 or the second winding group 14 can be appropriately detected.

In the SW elements 51 to 56 and 61 to 66, the SW elements 51 to 53 and 61 to 63 on the high potential side are arranged on the O side of the shaft center of the motor 10, and the SW elements 51 to 53 and 61 to 63 on the high potential side are arranged. SW elements 54 to 56 and 64 to 66 on the low potential side are arranged on the outside. By arranging in this way, wiring on the substrate 41 becomes easier as compared with the case where the SW elements 51 to 53 and 61 to 63 on the high potential side are arranged on the outside.

The first motor line 135 and the second motor line 145 are arranged point-symmetrically with respect to the axial center O of the motor 10 on the substrate 41. As a result, the first motor line 135 and the second motor line 145 are arranged so that the corresponding phases are point-symmetrical, and the magnetic flux leakage is canceled out, so that the magnetic flux leakage can be reduced. Further, for example, when the rotation angle sensor 85 is arranged at the axis center O of the motor 10, the rotation angle sensor 85 can reduce the detection error due to the influence of magnetic flux leakage.

In the first motor line 135 and the second motor line 145, the phases arranged on both sides of the first motor line 135 and the second motor line 145 are symmetrically arranged with respect to the phase arranged in the center. That is, in the first motor line 135 and the second motor line 145, the U phase and the W phase are arranged symmetrically with respect to the V phase. As a result, the variation in the wiring length between the phases is further reduced, so that the variation in the impedance between the phases can be further reduced.
The motor lines 136, 137, and 138 are arranged in a straight line on the substrate 41. Further, the motor lines 146, 147, and 148 are arranged in a straight line on the substrate 41.

The drive device 1 of the present embodiment is applied to the electric power steering device 8. That is, the electric power steering device 8 includes a drive device 1 and a reduction gear 9 for transmitting the torque output from the motor 10 to the column shaft 102, and drives the column shaft 102 with the torque of the motor 10. It assists the driver in steering the steering wheel 101.
The drive device 1 of the present embodiment is configured such that the motor 10 and the ECU 40 are coaxially provided, the physique in the axial direction is miniaturized, and most of the entire device fits within the motor region. .. As a result, it can be mounted even in a place where the mounting space is narrow. Further, in the drive device 1 of the present embodiment, an O-ring 39 is provided between the motor case 11 and the frame member 20, and the frame member 20 and the cover member 90 are fixed with an adhesive. , It has a waterproof structure. Therefore, the drive device 1 may be mounted in the engine room, and is suitably applicable to, for example, a rack assist type electric power steering device.

(Second Embodiment)
The driving device according to the second embodiment of this embodiment is shown in FIGS. 12 to 17. Note that FIG. 12 is a cross-sectional view taken along the line XII-XII of FIG. In each figure according to this embodiment, capacitors 86 and 87 are omitted as appropriate.
The drive device 2 includes a motor 210 as a rotary electric machine, a front frame end 215, a rear frame end 220, an ECU 240 as a controller, a connector 280, a cover member 290, and the like. In this embodiment, the rear frame end 220 corresponds to the "frame member". Since the electrical configuration of the drive device 2 is the same as that of the above embodiment, the description thereof will be omitted.

As shown in FIGS. 12 to 15, the motor 210 includes a stator 212, a rotor 15, a shaft 16, and the like.
The front frame end 215 and the rear frame end 220 are fixed to the stator 212. Further, in the present embodiment, the motor case is omitted, and the stator 212 is exposed. Other points are the same as those of the stator 12 of the above embodiment. That is, in the drive device 2 of the present embodiment, the stator 212 is exposed and does not have a waterproof structure. Therefore, the drive device 2 of the present embodiment is preferably provided in the vehicle interior, and is preferably applied to the column assist type electric power steering device.
In the present embodiment, since the motor case is omitted, the region on which the stator 212 is projected is regarded as the “motor region”.

The front frame end 215 is made of a metal such as aluminum, and is provided at an end portion of the motor 210 opposite to the ECU 240. A shaft hole 216 is formed at substantially the center of the front frame end 215. A bearing 166 is provided in the front frame end 215, and one end 161 of the shaft 16 is inserted through the front frame end 215. As a result, one end 161 of the shaft 16 is exposed from the front frame end 215. An output end 165 is provided at one end 161 of the shaft 16. The output end 165 is connected to the reduction gear 9. As a result, the torque generated by the rotation of the rotor 15 and the shaft 16 is output to the column shaft 102 via the reduction gear 9.

As shown in FIGS. 12 to 15, the rear frame end 220 has a frame portion 222, a heat radiating portion 230, and a connector receiving portion 236, and is made of a metal having good thermal conductivity such as aluminum, and the motor 210. It is provided on the ECU 240 side of the above. The front frame end 215 and the rear frame end 220 are fastened with a through bolt (not shown) with the motor 210 sandwiched between them. Further, a motor wire insertion hole (not shown) is formed in the rear frame end 220. The motor wires 135 and 145 are inserted into the motor wire insertion holes and taken out to the ECU 240 side.

The frame portion 222 is formed in a substantially annular shape on the motor 210 side and is fixed to the stator 212 of the motor 210.
The heat radiating portion 230 is erected on the ECU 240 side of the frame portion 222.
A shaft hole 231 is formed in the shaft center O of the heat radiating portion 230. A bearing 167 is provided in the shaft hole 231, and the other end 162 of the shaft 16 is inserted through the shaft hole 231. As a result, the magnet 18 provided at the other end 162 of the shaft 16 is exposed to the ECU 240 side.
A substrate fixing portion 232 is formed on the outside of the heat radiating portion 230. A heat radiating surface 235 is formed on the ECU 240 side of the heat radiating unit 230.
The connector receiving portion 236 is formed so as to project radially outward from the heat radiating portion 230. The connector 280 is arranged on the ECU 240 side of the connector receiving portion 236. The connector receiving portion 236 and the connector 280 are separated from each other.

The ECU 240 is on the opposite side of the rear frame end 220 from the motor 210 and is provided substantially coaxially with the motor 210.
The ECU 240 has a substrate 241 on which various electronic components are mounted.
The substrate 241 is formed in a shape that fits within the projected region of the rear frame end 220. Further, the SW elements 51 to 56, 61 to 66 mounted on the substrate 241 and constituting the ECU 240, the current detection elements 57 to 59, 67 to 69, the capacitors 86 and 87, and the choke coil 89 are housed in the motor region. ing.
Here, the surface of the substrate 241 on the motor 210 side is referred to as a heat generating element mounting surface 242, and the surface on the side opposite to the motor 10 is referred to as an electronic component mounting surface 243. In this embodiment, the heat generating element mounting surface 242 corresponds to "one surface".

As shown in FIG. 16, on the heat generating element mounting surface 242, SW elements 51 to 56, 61 to 66, current detection elements 57 to 59, power supply relays 71 and 72, reverse connection protection relays 73 and 74, ASIC82, and rotation. An angle sensor 85 or the like is mounted.
In the present embodiment, the SW elements 51 to 56, 61 to 66, the current detection elements 57 to 59, 67 to 69, the power supply relays 71 and 72, the reverse connection protection relays 73 and 74, and the ASIC 82 are via a heat dissipation gel. It contacts the heat radiating surface 235 of the heat radiating portion 230 of the rear frame end 220 in a state where heat can be radiated. As a result, the heat generated by the SW elements 51 to 56, 61 to 66, the power supply relays 71, 72, the reverse connection protection relays 73, 74, and the ASIC 82 is dissipated to the rear frame end 220 via the heat dissipation gel. To. Further, on the electronic component mounting surface 243, the microcomputer 81 is mounted in a region where at least a part overlaps with the ASIC 82 (see FIGS. 12 and 17).

In the present embodiment, the SW elements 51 to 56 constituting the first inverter unit 50 and the SW elements 61 to 66 constituting the second inverter unit 60 are the axial center O of the motor 10 (in this embodiment, the rotation angle). It is arranged symmetrically with respect to the place where the sensor 85 is mounted). In the present embodiment, the SW elements 51 to 56 and the SW elements 61 to 66 are arranged point-symmetrically with respect to the axis center O of the motor 10. Regarding the phase arrangement, as in the above embodiment, the first inverter unit 50 is arranged in the order of U phase, V phase, and W phase from the power supply region Rin side, and the second inverter unit 60 is in the power supply region. From the Rin side, the W phase, the V phase, and the U phase are arranged in this order.
The arrangement of various electronic components mounted on the substrate 241 is the same as that of the above embodiment except for the above points.

A motor wire insertion portion 244 is formed on the outer side in the radial direction of the first region R1 on which the elements constituting the first inverter portion 50 of the substrate 241 are mounted. The motor wire 135 is inserted through the motor wire insertion portion 244 and connected by solder or the like. Further, a motor wire insertion portion 245 is formed on the outer side in the radial direction of the second region R2 on which the elements constituting the second inverter portion 60 of the substrate 241 are mounted. The motor wire 145 is inserted into the motor wire insertion portion 245 and connected by solder or the like.

The motor wire insertion portions 244 and 245 are formed on the circumference C centered on the axis center O. That is, on the substrate 241 the motor lines 135 and 145 are arranged on the circumference C. In the present embodiment, the motor wires 135 and 145 are taken out from the winding sets 13 and 14 wound around the annular stator 212. By forming the motor wire insertion portions 244 and 245 on the same circumference, the motor wires 135 and 145 can be taken out substantially straight from the stator 212 side to the substrate 41 side. Easy to connect.

A hole 248 is formed at a portion of the substrate 241 corresponding to the substrate fixing portion 232. The board fixing screw 49 is inserted into the hole 248 and screwed into the board fixing portion 232 of the rear frame end 220. As a result, the substrate 241 is fixed to the rear frame end 220.

Further, the substrate 241 has an arc portion 251 formed in an arc shape and a connector fixing portion 252 formed on the radial outer side of the arc portion 251. A hole 253 through which the connector fixing screw 289 is inserted is formed in the connector fixing portion 252.
A connector 280 is provided on the connector fixing portion 252 on the heat generating element mounting surface 242 side of the substrate 241 and outside the power supply relays 71 and 72 and the reverse connection protection relays 73 and 74.

As shown in FIGS. 12 to 15, the connector 280 is fixed to the substrate 241 by the connector fixing screw 289 inserted from the electronic component mounting surface 243 side of the substrate 241.
The connector 280 is formed of resin or the like, is fixed in a state of protruding outward in the radial direction from the substrate 241 and is arranged on the ECU 240 side of the connector receiving portion 236 of the rear frame end 220. The connector 280 is provided on the ECU 240 side of the frame portion 222 and the connector receiving portion 236 of the rear frame end 220, and is included in the concept that "the connector is arranged on the controller side of the frame member". And.

In the present embodiment, the connector 280 is provided on the heat generating element mounting surface 242 side of the substrate 241 so that the heat radiating portion 230 is formed by rising up by the height of the connector 280, thereby increasing the heat mass of the heat radiating portion 230. This makes it possible to dissipate the heat generated by the heat generating element 70 with high efficiency.

The connector 280 is formed so that the opening 281 faces the radial outer side and the harness can be connected from the radial outer side. Further, the connector 280 has a terminal 282. The terminal 282 is connected to the substrate 241.
In the connector 280 of the present embodiment, the power supply connector 283 and the signal connector 284 are integrally formed. A flange portion 285 is formed on the outer periphery of the connector 280.

The cover member 290 is formed of metal or the like separately from the connector 280. The cover member 290 has a top portion 291 and a side wall 292 formed along the outer edge of the top portion 291. The cover member 290 is formed so as to cover the ECU 240, and is fixed to the rear frame end 220 by caulking or the like.
A notch 293 having a shape corresponding to the connector 280 is formed on the side wall 292. As a result, the opening 281 side of the connector 280 is exposed from the cover member 290.

In the present embodiment, it is assumed that the motor 10 side is mounted so as to be on the lower side in the vertical direction, and the motor 10 side of the flange portion 285 is exposed from the cover member 290. By providing the flange portion 285, water or the like can be prevented from entering the inside of the device from between the cover member 290 and the connector 280. Further, the infiltrated water is discharged to the outside of the drive device 2 through the flange portion 285.

In the present embodiment, the first motor line 135 and the second motor line 145 are arranged on the same circumference on the substrate 241. This facilitates the connection between the motor wires 135 and 145 drawn from the first winding set 13 and the second winding set 14 wound around the annular stator 212 and the substrate 241.
Moreover, the same effect as that of the above-described embodiment is obtained.

(Third Embodiment)
A third embodiment of the present invention is shown in FIG. FIG. 18 is a schematic cross-sectional view, and the description of some members such as a connector is omitted. In addition, hatching of SW elements and the like is omitted. The same applies to FIGS. 19 and 20 described later.

In the drive device 3 of the third embodiment, the ECU 340 is different from that of the above embodiment.
In the ECU 340, a substrate 341, an intermediate member 350, and a heat sink 355 are provided in this order from the motor 10 side. SW elements 51 to 56 and 61 to 66 are mounted on the heat generating element mounting surface 342, which is the surface of the substrate 341 on the motor 10 side. The arrangement of the SW elements 51 to 56, 61 to 66, etc. on the heat generating element mounting surface 342 side is the same as in FIG. That is, as in the above embodiment, the first motor line 135 and the SW elements 51 to 56 and the second motor line 136 and the SW elements 61 to 66 have the phase arrangements in the reverse order from the power supply region Rin side. .. In this embodiment, the heat generating element mounting surface 342 corresponds to "one surface".
The mounting surface 343 on the side opposite to the motor 10 of the substrate 341 may be designated as "one surface", and the SW elements 51 to 56 and 61 to 66 may be mounted on the mounting surface 343.

The intermediate member 350 has a plate-shaped portion 351 and a peripheral wall portion 352. The plate-shaped portion 351 is formed in a substantially disk shape, and the electronic component 181 is mounted on the surface on the substrate 341 side. The peripheral wall portion 352 is formed at least a part of the outer edge of the plate-shaped portion 351 so as to extend toward the substrate 341 side and the heat sink 355 side. The substrate 341 and the intermediate member 350 are electrically connected by, for example, a wiring pattern or the like. A hole through which the shaft 160 is inserted is formed substantially in the center of the substrate 341 and the plate-shaped portion 351.

A bearing 168 that rotatably supports the shaft 160 is provided at substantially the center of the heat sink 355. An electronic component 182 is arranged on the surface of the heat sink 355 on the motor 10 side. The electronic component 182 is connected to the intermediate member 350 by a terminal or the like (not shown).
Electronic components 181, 182 are, for example, relays, capacitors, coils, microcomputers, ASICs, and the like. The electronic components 181 and 182 may be mounted on the surface of the substrate 341 or the plate-shaped portion 351 on the heat sink 355 side.
Even with this configuration, the same effect as that of the above embodiment can be obtained.

(4th embodiment, 5th embodiment)
As shown in FIG. 19, in the drive device 4 of the fourth embodiment of the present invention, the ECU 440 is different from that of the third embodiment. In the fourth embodiment, the SW elements 51 to 56 and 61 to 66 are arranged on the surface of the plate-shaped portion 351 on the motor 10 side. In the fourth embodiment, the plate-shaped portion 351 is regarded as a "board". The SW elements 51 to 56 and 61 to 66 may be arranged on the surface of the plate-shaped portion 351 on the heat sink 355 side.

As shown in FIG. 20, in the drive device 5 of the fifth embodiment of the present invention, the ECU 550 is different from that of the third embodiment. In the present embodiment, the SW elements 51 to 56 and 61 to 66 are arranged on the surface of the heat sink 355 on the motor 10 side. In the fifth embodiment, the heat sink 355 is regarded as a "board".

The heat sink 355, the SW elements 51 to 56, 61 to 66, and the motor wires 135 and 145 are not electrically connected. The SW elements 51 to 56 and 61 to 66 may be electrically connected to the intermediate member 350 or the substrate 341 by, for example, terminals (not shown). Further, in FIG. 20, the SW elements 51 to 56, 61 to 66 and the plate-shaped portion 351 are separated from each other. For example, the SW elements 51 to 56, 61 to 66 are on the opposite side of the plate-shaped portion 351 from the motor 10. It may be electrically connected on the surface and provided on the heat sink 355 so as to dissipate heat.

The phase arrangement of the SW elements 51 to 56, 61 to 66, and the motor wires 135 and 145 on the plate-shaped portion 351 or the heat sink 355 is the same as in the above embodiment. Here, for example, when the power supply region Rin is provided on the substrate 341, the portion where the power supply region Rin is projected in the axial direction may be regarded as the “reference position”. The power supply region Rin may be formed in the plate-shaped portion 351.

Further, in FIGS. 19 and 20, the motor wires 135 and 145 are formed so as to extend to the plate-shaped portion 351 or the heat sink 355 side. Here, the substrate 341 and the plate-shaped portion 351 or the heat sink 355 may be regarded as a "substrate", and the motor wires 135 and 145 may be connected to the substrate 341. That is, the motor wires 135 and 145 may not be formed so as to extend to the plate-shaped portion 351 or the heat sink 355.
Even with this configuration, the same effect as that of the above embodiment can be obtained.

Electronic components are not shown on the substrate 341 of FIGS. 19 and 20 and the intermediate member 350 of FIG. 20, but the substrate 341 and the intermediate member 350 include electrons such as capacitors, coils, a microcomputer, and an ASIC. Parts can be mounted as appropriate. Further, in FIGS. 18 and 19, the electronic components 181 and 182 arranged on the intermediate member 350 or the heat sink 355 may be omitted.

(Other embodiments)
(A) Frame member In the above embodiment, the frame member is fixed to the motor case by the frame fixing screw. In another embodiment, the frame member may be fixed to the motor case by a member other than the screw. Further, the frame member may be fixed to the motor case by press fitting. As a result, the number of parts can be reduced. In addition, the physique in the radial direction can be miniaturized. In the third to fifth embodiments, the frame member is omitted. In another embodiment, as in the third to fifth embodiments, the frame member may be provided in the drive device including the intermediate member.

(B) ECU
In the above embodiment, the heat generating element comes into contact with the frame member via the heat radiating gel. In another embodiment, a heat radiating sheet may be used instead of the heat radiating gel, or the heat generating element and the frame member may be configured to be in direct contact with each other. Further, in the above embodiment, the SW element is formed by exposing the heat radiation slag from the mold portion. In other embodiments, the SW element does not have to expose the heat dissipation slag. The same applies to the power relay, the reverse connection protection relay, and the ASIC.

Further, in the above embodiment, the drive element, the current detection element, the power supply relay, the reverse connection protection relay, and the ASIC correspond to the heat generation element, and these heat generation elements are provided so as to be able to dissipate heat from the back to the frame member. In other embodiments, the current detection element, the power relay, and the reverse connection protection relay may be mounted on a surface different from the first drive element and the second drive element, or may be omitted. Further, the first drive element and the second drive element may be mounted on the electronic component mounting surface side, which is the surface of the frame member opposite to the rotating electric machine. In this case, the electronic component mounting surface corresponds to "one surface". Further, the current detection element may be, for example, a Hall IC or the like other than the shunt resistor, or a part of the current detection element may be omitted, such as providing a current detection element for two phases. The power relay may be a mechanical relay.
Furthermore, an electronic component different from these elements may be used as a heat generating element and mounted on the heat generating element mounting surface of the substrate so that heat can be dissipated from the back surface to the frame member. Furthermore, some or all of the electronic components mounted on the heat generating element mounting surface do not have to dissipate heat to the frame member.

In the above embodiment, the ASIC, which is an electronic component constituting the control unit, is mounted on the heat generating element mounting surface, and the microcomputer is mounted on the electronic component mounting surface. In another embodiment, the electronic components constituting the control unit are not limited to the ASIC and the microcomputer, and the package may be configured in any way. Further, for example, the ASIC is mounted on the electronic component mounting surface, the microcomputer is mounted on the heat generating element mounting surface, and the electronic component related to the control is the heat generating element mounting surface or the electronic component depending on the package configuration and the heat generation status. It may be mounted on either side of the component mounting surface. Further, the microcomputer may be mounted in an area that does not overlap with the ASIC. The "heating element mounting surface" and the "electronic component mounting surface" mean that the heat generating element and the electronic component can be mounted, and the heat generating element and the electronic component may not necessarily be mounted.

In the above embodiment, in the first embodiment, the SW element constituting the first inverter unit and the SW element constituting the second inverter unit are arranged line-symmetrically, and in the second embodiment, the first inverter unit is configured. The SW element to be used and the SW element constituting the second inverter unit are arranged point-symmetrically. In another embodiment, the SW elements may be arranged point-symmetrically in the configuration of the first embodiment, or the SW elements may be arranged line-symmetrically in the configuration of the second embodiment. Further, the arrangement of the SW elements is not limited to the symmetrical arrangement, and may be arranged in any way. Furthermore, the arrangement of various electronic components mounted on the substrate other than the SW element may be arbitrary.

Further, in the above embodiment, in the first system, the U phase, the V phase, and the W phase are arranged in this order from the power supply region side, and in the second system, the W phase, the V phase, and the U phase are arranged from the power supply region side. Are arranged in the order of. In another embodiment, the phase arrangement of the first system is not limited to the order of U phase, V phase, and W phase from the power supply region side, and may be arranged in any manner. That is, the first phase, the second phase, and the third phase may be any of the U phase, the V phase, and the W phase, respectively. Further, the phase sequence of the second line is arranged in the reverse order of the phase sequence of the first line. Thereby, as in the above embodiment, the magnetic flux leakage can be canceled out, and the influence of the magnetic flux leakage in the rotation angle sensor can be reduced. In addition, it is possible to reduce variations in wiring impedance between phases.
Further, the first take-out line and the first drive element, and the second take-out line and the second drive element have a reference position other than the power supply region, and the phase arrangement from the reference position is reversed. May be good.

In the above embodiment, the first take-out line and the second take-out line are arranged point-symmetrically. In other embodiments, the first and second take-out lines may be arranged in a manner other than point symmetry. Further, at least one of the first take-out line and the second take-out line does not have to be symmetrical in the phases arranged on both sides with respect to the phase arranged in the center. Furthermore, the first take-out line may be arranged on the substrate at a position other than the radial outer side of the first region. Similarly, the second take-out line may be arranged on the substrate at a position other than the radial outer side of the first region.

In the above embodiment, the high potential side element, the low potential side element, and the current detection element are arranged in this order from the axis center side. In another embodiment, the element arrangement from the axis center may be arranged in any manner, for example, the low potential side element may be arranged on the axis center side. Further, a part of the current detection element may be omitted, for example, a current detection element for two phases is provided.

In the above embodiment, the distance from the center of the power supply region to the center of the first region and the distance from the center of the power supply region to the center of the second region are substantially equal. In another embodiment, for example, the power supply relay and the reverse connection protection relay are omitted, and the power supply area is formed in the vicinity of the portion where the reverse connection protection relay 73 is mounted in FIG. The distance from the center to the center of the first region and the distance from the center of the power supply region to the center of the second region do not have to be equal. In such a case, for example, the entire anti-inverter portion side of the wiring pattern in which power is supplied from the battery is regarded as the "power supply region" from the end portion on the inverter portion side, and the first system is viewed from the power supply region side. The first phase, the second phase, and the third phase may be arranged in this order, and the second system may be arranged in the order of the third phase, the second phase, and the first phase. Even with this configuration, it is possible to reduce the variation in wiring impedance between the phases as compared with the case of other phase arrangements.

In the first embodiment, a metal piece used for connecting to the motor wire is mounted on the substrate, and the substrate and the motor wire are connected by press fitting. Further, in the second embodiment, the substrate and the motor wire are connected by solder or the like. In another embodiment, for example, in the configuration of the first embodiment, the substrate and the motor wire may be connected by solder, or in the configuration of the second embodiment, a metal piece provided on the substrate may be connected. The substrate and the motor wire may be connected by the press fit used. Further, the connection between the substrate and the motor wire is not limited to press-fitting and soldering, and may be connected by any method.
In the above embodiment, the substrate is fixed to the frame member by the substrate fixing screw. In other embodiments, the method of fixing the substrate to the frame member is not limited to the use of screws, and may be any method.

(C) Connector section In the first embodiment, the connector section is composed of one power supply connector and two signal connectors. In other embodiments, some or all of these connectors may be provided. These connectors may be provided separately as in the first embodiment, or may be partially or wholly formed integrally as in the second embodiment.

Further, when the motor case is not provided as in the second embodiment, the stator may be a “cylinder portion of a rotary electric machine” and the connector may be arranged in a projection region in which the stator is projected in the axial direction. Further, assuming that the connector and the cover member are separate bodies, the connector may be fixed to the electronic component mounting surface side (that is, the side opposite to the motor) of the board of the cover member.
That is, any combination may be used with respect to the number of connectors, the orientation of the opening of the connector, and the integral or separate body with the cover member.

(D) Cover member In the first embodiment, the cover member is fixed to the frame member with an adhesive. Further, in the second embodiment, the frame member is fixed by caulking. The method of fixing the cover member to the frame member is not limited to this, and any method may be used such as fixing with screws or the like.

(E) Drive device In the above embodiment, the rotary electric machine is a three-phase brushless motor. In another embodiment, the rotary electric machine is not limited to a brushless motor, and may be any motor having three or more phases. Further, the rotary electric machine is not limited to the motor (electric motor), and may be a generator, or may be a so-called motor generator having the functions of the electric motor and the generator.
In the above embodiment, the output end connected to the gear is provided on the side opposite to the ECU with the motor interposed therebetween. In other words, in the drive device of the above embodiment, the output terminal, the motor, and the ECU are arranged in this order. In other embodiments, the output end may be provided on the side opposite to the motor with the ECU in between. In other words, in the drive device of another embodiment, the motor, the ECU, and the output terminal may be arranged in this order.
In the above embodiment, the drive device is applied to an electric power steering device. In other embodiments, the drive device may be applied to devices other than the electric power steering device.
As described above, the present invention is not limited to the above-described embodiment, and can be implemented in various embodiments without departing from the spirit of the invention.

1 to 5 ... Drive device 8 ... Electric power steering device 10, 210 ... Motor (rotary electric machine)
13 ... 1st winding set 14 ... 2nd winding set 135 ... 1st motor line (1st take-out line)
145 ... 2nd motor line (2nd take-out line)
20 ... Frame member 220 ... Rear frame end (frame member)
41, 241, 341 ... Substrate 50 ... First inverter section 51-56 ... SW element (first drive element)
60 ... 1st inverter section 61-66 ... SW element (2nd drive element)

Claims (14)

Together with the stator (12, 212) around which the first winding set (13) and the second winding set (14) are wound, the rotor (15) provided so as to be rotatable relative to the stator, and the rotor. With a three-phase or more rotating electric machine (10, 210) having a rotating shaft (16),
Substrates (41, 241, 341) provided on one side of the rotary electric machine in the axial direction, and
A heat sink (355) provided on the opposite side of the substrate to the rotary electric machine,
An intermediate member (350) provided between the substrate and the heat sink,
A first drive element (51-56) arranged on one surface (42, 242, 342) of the substrate and constituting a first inverter unit (50) for switching the energization of the first winding set.
The same surface as the surface of the substrate on which the first driving element is arranged, and the area opposite to the first area, which is the area where the first driving element is arranged, with the axial center of the rotary electric machine interposed therebetween. The second drive element (61 to 66), which is arranged in the second region and constitutes the second inverter unit (60) for switching the energization of the second winding set,
A first take-out wire (135) taken out from the first winding set for each phase and arranged on the substrate, and
A second take-out wire (145) taken out from the second winding set for each phase and arranged on the substrate, and
With
The first take-out line and the first drive element, and the second take-out line and the second drive element are arranged in reverse order from the reference position side on the substrate.
The first drive element and the second drive element are surface-mounted on the substrate by dividing an area for each system.
A driving device characterized in that the first driving element and the second driving element are arranged side by side for each phase. Includes a wiring pattern that supplies power from a power source (109) on the same surface as the surface on which the first drive element and the second drive element are arranged on the substrate to the first inverter unit and the second inverter unit. Further provided are relays (71, 72) arranged in the power supply region, which is a region, and capable of switching the conduction or interruption of the current energized between the power supply and the first inverter unit or the second inverter unit. The driving device according to claim 1. A frame member (20, 220) provided between the rotary electric machine and the substrate is further provided.
The first or second drive element according to claim 1 or 2 , wherein the first drive element and the second drive element are arranged on a surface (42) of the substrate on the frame member side so as to dissipate heat to the frame member. Drive device. The first take-out line is connected to the substrate on the radial outside of the first region, and is connected to the substrate.
The drive device according to any one of claims 1 to 3 , wherein the second take-out line is connected to the substrate on the radial outer side of the second region. Between the first drive element and the first take-out line on the same surface as the surface on which the first drive element and the second drive element are arranged, or between the second drive element and the second. A current detection element (57 to 59, 67 to 69) arranged between the take-out line and detecting a current applied to each phase of the first winding set or the second winding set is further provided. The drive device according to claim 4. In the first drive element and the second drive element, high potential side elements (51 to 53, 61 to 63) are arranged on the shaft center side of the rotary electric machine, and the low potential side element is outside the high potential side element. The drive device according to any one of claims 1 to 5 , wherein (54 to 56, 64 to 66) are arranged. The first driving element and the second driving element include high potential side elements (51 to 53, 61 to 63) and low potential side elements (54 to 56, 64 to 66).
The driving device according to any one of claims 1 to 6 , wherein the high-potential side element and the low-potential side element are individually packaged. The invention according to any one of claims 1 to 7 , wherein the first take-out line and the second take-out line are arranged point-symmetrically with respect to the axial center of the rotary electric machine on the substrate. Drive device. The first and second take-out lines are according to any one of claims 1 to 8 , wherein the phases arranged on both sides of the first take-out line and the second take-out line are symmetrically arranged with respect to the phase arranged in the center. The drive device described. The drive device according to any one of claims 1 to 9 , wherein the first take-out line and the second take-out line are arranged on the same circumference on the substrate. The first take-out line is arranged on the substrate in a straight line.
The drive device according to any one of claims 1 to 9 , wherein the second take-out line is arranged on the substrate in a straight line. The first capacitor (86) connected to the first inverter unit is mounted on the back surface of the substrate corresponding to the first region.
The driving device according to any one of claims 1 to 11 , wherein the second capacitor (87) connected to the second inverter unit is mounted on the back surface of the substrate corresponding to the second region. The electronic components of the control section, includes a microcomputer (81) and ASIC (82) is,
The area where the microcomputer is mounted on one surface, the ASIC is mounted on the other surface, and the area where the microcomputer is mounted and the area where the ASIC is mounted overlap at least a part of claims 1 to 12 . The driving device according to any one item. The drive device (1 to 5) according to any one of claims 1 to 13.
A power transmission unit (9) that transmits the torque output from the rotary electric machine to the drive target (102), and
With
An electric power steering device characterized in that the driving target is driven by the torque of the rotary electric machine to assist the driver in steering the steering member (101).

Images