JP2016226126A - Terminal connection structure and motor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal connection structure capable of reducing the number of connecting steps of terminals of modules, and a motor unit.SOLUTION: A module 70 formed by stacking a plurality of semiconductor elements and having a plurality of terminals 72, 75, are electrically connected to a wiring part 50 and a control board 60 via each terminals 72, 75. Terminals 72, 75 of the module 70 are sandwiched between the module 70 and, the wiring part 50 and the control board 60, respectively, thereby they are electrically connected to the wiring part 50 and the control board 60.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a terminal connection structure and a motor unit.

  The motor control includes at least a module that controls power supply to the motor, a wiring unit that forms a power supply path to the motor, and a control board that controls the operation of the module. And there exists a motor unit which unitized these modules, the wiring part, and the control board with the motor. As such a motor unit, there is a motor unit described in Patent Document 1, for example. In Patent Document 1, a control terminal provided in a module is inserted into a hole formed in a control board, and is further fixed to the control board with solder or the like. That is, the module and the control board are electrically connected so that the control board can control the operation of the module. Moreover, the wiring terminal provided in the module is inserted into a hole formed in the wiring part, and is further fixed to the wiring part by soldering or the like. That is, the module and the wiring unit are electrically connected so that the wiring unit can supply power to the module.

JP 2014-131463 A

  By the way, in the motor unit described in Patent Document 1, the control terminals and wiring terminals of the module must be fixed with solder or the like at the time of assembly, which causes an increase in the number of assembly steps. The number of assembling steps increases as the number of control terminals and wiring terminals of the module increases. And the motor unit itself has many parts in the first place, and the number of processes can be reduced not only to connect the module terminals, but also to reduce the number of processes to connect the module terminals. It has become.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a terminal connection structure and a motor unit that can reduce the number of steps of module terminal connection.

  The terminal connection structure that solves the above problems is an electrical connection between a module that controls power supply from the power source to the motor and a control board that controls the operation of the wiring section or module that forms the power supply path from the power source to the motor. Connection is possible. In the terminal connection structure, the module has terminals by integrating semiconductor elements. And the terminal of a module is electrically connected to a wiring part or a control board by being pinched | interposed between a module and a wiring part or a control board.

  According to the above configuration, the module terminals are electrically connected to the wiring section or the control board only by the process of being sandwiched between the module and the wiring section or the control board. Therefore, when the module terminals are electrically connected to the wiring portion or the control board, it is possible to reduce the step of fixing with solder or the like. Therefore, the number of steps for connecting the terminals of the module can be reduced. Furthermore, if some (or all) terminals of the module can be sandwiched between the module and the wiring section or the control board, further process reduction can be realized.

  The terminal connection structure is configured by unitizing the module, the wiring unit, the control board, a motor having a motor shaft, and a heat sink that houses the motor shaft and promotes heat dissipation. The motor unit can be embodied. In the motor unit, the module, the wiring unit, and the control board are stacked in the axial direction of the motor shaft with respect to the heat sink. And the terminal of a module is comprised so that it may be pinched | interposed between a module, a wiring part, or a control board by extending in the radial direction of the motor shaft in a module, and bend | folding to the control board or a wiring part side.

  As described above, the motor unit itself has many parts in the first place. Therefore, the assembly of the motor unit itself has a large number of steps. However, when the module, wiring unit, and control board are stacked and arranged on the heat sink (in this case, the axial direction of the motor shaft) as in the above configuration, the module terminals are connected to the module in the stacking process. And the wiring portion or the control board. On the other hand, when the module terminals are extended in a direction orthogonal to the direction in which the module, the wiring unit, and the control board are stacked, as in the above configuration, it is necessary to bend in the direction in which the modules are stacked. For this reason, at least such a folding step is necessary. However, even if the bending process is necessary, it is clear that the accuracy required for the process is lower and the actual process is less than the case of fixing with solder or the like. Therefore, it is possible to reduce the time and labor required for connecting the module terminals.

  In the motor unit, the stacking arrangement is to arrange the wiring part or the control board between the heat sink and the module, and the wiring part or the control board and the module are added to the heat sink from the module side. It is preferable to be fastened by the fastening force.

  According to the above configuration, the motor unit can be easily assembled to the heat sink when the wiring portion or the control board is brought into contact with the heat sink. The reason is that the size of the module module is easy to be configured with respect to the wiring part or the control board. That is, in the above configuration, when stacking and arranging, when viewed from the stacking and arranging direction, even if the module is present in the upper layer of the stack, the wiring portion or the control board existing in the lower layer can be easily seen. Therefore, in the stacking and arranging step, it is possible to perform an operation while checking and checking all the states of the module and the wiring unit or the control board. Therefore, the process of connecting the terminals of the module can be easily performed.

  On the other hand, the stacked arrangement is to arrange the module between the heat sink and the wiring part or the control board, and the wiring part or the control board and the module are connected to the heat sink from the wiring part or the control board side. It can also be made to be fastened by the fastening force added.

  According to the said structure, a module can be arrange | positioned closest to a heat sink. That is, the module can be brought into contact with the heat sink, and the heat dissipation of the module can be preferably promoted. Thereby, at the time of use as a motor unit, the heat dissipation effect of the module can be enhanced, and the operation of the motor unit can be suitably stabilized.

In the motor unit, the modules are preferably stacked and have a heat dissipation surface on the heat sink side.
According to the said structure, the heat dissipation of a module can be accelerated | stimulated rather than the case where it does not have a heat sink regardless of whether a module is made to contact a heat sink. Moreover, even when the module is not brought into contact with the heat sink as in the configuration described above, the heat dissipation of the module can be promoted. Therefore, it is possible to stabilize the operation of the motor unit.

  According to the present invention, the number of steps for connecting the terminals of the module can be reduced.

Sectional drawing which shows the outline of the motor unit of 1st Embodiment. II-II sectional view taken on the line of FIG. III-III sectional view taken on the line of FIG. The front view which shows the module about a motor unit. (A)-(c) is the VV sectional view taken on the line of FIG. 4 which shows the bending process about a module. Sectional drawing which shows the structure of the motor unit of 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the motor unit will be described.
As shown in FIG. 1, the motor unit is a unit obtained by unitizing a motor 12 having a motor shaft 11 and a motor controller 13 for controlling the rotation operation of the motor 12. As will be described later, the main components of the motor controller 13 include a wiring unit 50, a control board 60, and a module 70. In addition, the motor unit of this embodiment is mounted in the electric power steering apparatus in a vehicle, for example. The electric power steering device controls the motor unit so that an assist torque corresponding to the steering torque when the driver of the vehicle operates the steering wheel is generated (assisting the driver's steering operation).

  The motor unit includes a cylindrical motor housing 14 that houses the motor 12 and the motor controller 13. The motor housing 14 includes a cylindrical stator housing 20 having an opening 20a that opens to one side, and a cylindrical cover 21 having an opening 21a that opens to one side. The stator housing 20 and the cover 21 are provided so that the opening directions of the openings 20 a and 21 a are opposed to each other in the axial direction of the motor shaft 11. That is, the openings 20a and 21a close each other's openings. The stator housing 20 and the cover 21 are assembled by engaging a plurality of engaging portions (not shown) formed on the periphery of the opening 20a and a plurality of engaging claws (not shown) formed on the periphery of the opening 21a. It is done. In the following description, “axial direction” means the axial direction of the motor shaft 11, “radial direction” means a direction perpendicular to the “axial direction” (a direction perpendicular to the plane including the motor shaft 11), “Circumferential direction” means the direction of rotation about the “axial direction”.

  The stator housing 20 accommodates the motor 12 including the stator 30 and the rotor 33. A cylindrical stator 30 formed with a plurality of teeth is fixed to the inner periphery of the stator housing 20. A motor coil 31 is wound around each tooth of the stator 30 via an insulator. Lead wires 32a serving as connection ends of the motor coils 31 are respectively connected to motor-side bus bars 32 of corresponding phases (three phases of U phase, V phase, and W phase).

  A motor shaft 11 is disposed on the inner peripheral side of the stator 30, and a cylindrical rotor 33 is fitted on the motor shaft 11. That is, the rotor 33 rotates integrally with the motor shaft 11. A plurality of permanent magnets 34 formed in a rectangular plate shape are fixed to the outer periphery of the rotor 33. The permanent magnets 34 are alternately arranged with different polarities (N pole, S pole) in the circumferential direction of the rotor 33.

Note that the stator 30, the motor coil 31, the motor-side bus bar 32, the rotor 33, and the permanent magnet 34 described above are components of the motor 12.
The length of the motor shaft 11 is set such that its output side extends to the outside on the opposite side to the cover 21 of the stator housing 20. The length of the motor shaft 11 is set so that the cover 21 side (the side opposite to the output side) extends from the stator housing 20 to the inside of the cover 21. The output side of the motor shaft 11 is a side that transmits (outputs) the rotational torque of the motor 12 to the outside. The output side of the motor shaft 11 is rotatably supported by a bearing 35 fixed to the stator housing 20. On the other hand, the cover 21 side of the motor shaft 11 is rotatably supported by a bearing 36 fixed to a heat sink 40 described later.

  For the motor shaft 11, a resolver 80 is provided at a shaft end portion 11 a that extends to the inside of the cover 21. That is, the resolver 80 is disposed on the same axis as the motor shaft 11, that is, the rotor 33. The resolver 80 detects information used for calculating the rotation angle of the motor 12, that is, the rotor 33.

  In the motor 12, a rotating magnetic field is generated by supplying three-phase driving power to each motor coil 31 according to the rotation angle calculated using the detection result in the resolver 80. The rotor 33 rotates based on the relationship between the rotating magnetic field generated in the motor 12 and each permanent magnet 34.

  The cover 21 accommodates the motor controller 13 including the wiring unit 50, the control board 60, the module 70, the resolver 80, and the like. A connector 21b that is connected to an external power supply or an external control unit is formed on the opposite side of the opening 21a of the cover 21.

Hereinafter, the configuration of the motor controller 13 will be described in detail.
As shown in FIG. 1, the motor controller 13 includes a heat sink 40 having a function of promoting heat dissipation of various components that constitute the motor unit. The heat sink 40 has a disk-shaped base portion 41. The diameter of the base 41 is set to be slightly larger than the diameter of the opening 20a. The base 41 is fitted (press-fitted) into the opening 20 a of the stator housing 20.

  A rectangular parallelepiped installation portion 42 extends along the axial direction on the inner diameter side of the base portion 41. The installation part 42 is arranged on the opposite side to the motor 12 with the base part 41 as a boundary. An installation base 43 on which various parts constituting the motor controller 13 can be installed is formed on the outer surface of the installation unit 42 in the axial direction. The base portion 41 is formed with a communication port 41a that communicates the interior of the stator housing 20 and the cover 21 in the axial direction. The installation part 42 also constitutes the heat sink 40.

  A through hole 44 is formed in the heat sink 40 along its axial direction. The through hole 44 extends from the motor part 12 side of the base part 41 to the installation base 43 formed in a planar shape parallel to the base part 41. The installation base 43 is provided with an opening recess 45 through which the through hole 44 communicates. The motor shaft 11 is inserted through the through hole 44. In this case, the motor shaft 11 stops until the shaft end portion 11 a reaches the opening recess 45 and does not protrude from the installation base 43. The bearing 36 is fixed to the through hole 44 in the middle thereof. The bearing 36 is disposed on the way from the opening recess 45 of the through hole 44 toward the motor 12.

  The open recess 45 accommodates a resolver 80 including a resolver stator 81, a resolver coil 82, an output terminal 83, a resolver rotor 84, and the like. A cylindrical resolver stator 81 formed with a plurality of teeth is fixed to the inner periphery of the opening recess 45. A resolver coil 82 is wound around each tooth of the resolver stator 81 via an insulator. Connected to the resolver coil 82 is an output terminal 83 for outputting information used for calculating the rotation angle of the motor 12.

  A shaft end portion 11a of the motor shaft 11 is disposed on the inner peripheral side of the resolver stator 81, and a cylindrical resolver rotor 84 is fitted on the shaft end portion 11a. That is, the resolver rotor 84 rotates integrally with the motor shaft 11. The outer periphery of the resolver rotor 84 is formed in a shape in which the gap (gap) with the resolver stator 81 changes according to the rotation operation (rotation angle) of the motor shaft 11 (rotor 33).

  The resolver coil 82 includes an excitation coil to which an excitation voltage is applied by the external power source or the like, and an output coil in which a voltage is induced based on an excitation current corresponding to the excitation voltage. In the output coil, the voltage induced when the motor shaft 11 rotates changes. Then, the resolver 80 outputs from the output terminal 83 a voltage signal based on the voltage induced in the output coil. This voltage signal is information corresponding to the rotation angle of the motor 12.

  An accommodation hole 46 extending from the installation base 43 toward the motor 12 is formed on the radially outer side of the through hole 44 of the heat sink 40. The accommodation hole 46 is formed only in a part facing the wiring part 50. The accommodation hole 46 accommodates an electronic component 51 such as a coil or a capacitor, which will be described later, mounted on the wiring portion 50.

  In addition, as shown in FIGS. 1 to 3, the wiring base 50, the control board 60, and the module 70 are stacked on the installation base 43 in the axial direction. In addition, the wiring part 50 and the control board 60 of this embodiment comprise one wiring control board by connecting with each other. In the wiring control board, the wiring part 50 and the control board 60 have substantially the same region. In the present embodiment, in the installation base 43, the wiring portion 50, the control board 60, and the module 70 are laminated in the axial direction from the motor 12 side. That is, the stacked arrangement of the present embodiment is to arrange the wiring unit 50 and the control board 60 between the heat sink 40 and the module 70.

  As shown in FIGS. 2 and 3, two through-holes 91 are formed in the wiring unit 50 and the control board 60 across these boundaries. Further, two through holes 92 are formed in the module 70 on a line along the longitudinal direction that halves the length in the short direction. The modules 70 are stacked so that the line along the longitudinal direction that halves the length in the short side direction coincides with the boundary between the wiring portion 50 and the control board 60. That is, the through holes 91 of the wiring unit 50 and the control board 60 and the through holes 92 of the module 70 are arranged to coincide with each other in the axial direction.

  The module 70 is fixed to the heat sink 40 together with the wiring portion 50 and the control board 60 by inserting the screws 101 into the through holes 91 and 92. Each screw 101 is inserted through two screw holes 43 a formed in the installation base 43 of the heat sink 40. That is, the wiring unit 50, the control board 60, and the module 70 are fastened by the screws 101 so as to be close to each other. In this case, the heat sink 40 is applied with a fastening force for fastening the wiring portion 50 and the control board 60 and the module 70 by fastening each screw 101 to each screw hole 43a. In addition, each screw hole 43a is arrange | positioned so that it may correspond with each through-hole 91,92 in an axial direction.

Hereinafter, the wiring unit 50, the control board 60, and the module 70 will be described in detail.
As shown in FIGS. 1 and 2, the wiring part 50 is formed in a rectangular shape (rectangular shape) having a long side and a short side. The wiring unit 50 forms a power supply path for supplying power to the motor 12 and the like. An electronic component 51 such as a coil or an electrolytic capacitor is mounted on the wiring unit 50 on the motor 12 side. The coil reduces noise by cutting power in an extra frequency region of driving power supplied from an external power source. In addition, the electrolytic capacitor smoothes drive power supplied from a coil or an external power source to reduce noise. The electronic component 51 is disposed to face the accommodation hole 46 of the heat sink 40.

  The wiring part 50 is formed with a power terminal part 52 to which an external power source is connected. A power supply bus bar 21c extending from the connector 21b is connected to the power supply terminal portion 52. A printed wiring 50a is formed on the module 70 side of the wiring unit 50 using a copper plate or the like. The printed wiring 50 a is connected to the power supply terminal unit 52. The electronic components 51 are connected to the printed wiring 50a.

  As shown in FIGS. 1 and 2, the control board 60 is formed in a rectangular shape (rectangular shape) having a long side and a short side. The control board 60 is a control board that controls the operation of the module 70. An electronic component 61 such as a microprocessor or a ROM is mounted on the control board 60. In the control board 60, the electronic component 61 constructs a control circuit that controls the operation of the module 70.

  The control board 60 is formed with a signal terminal unit 62 to which an external control unit is connected. A signal line 21d extending from the connector 21b is connected to the signal terminal portion 62. A printed wiring 60a is formed on the module 70 side of the control board 60 using a copper plate or the like. The printed wiring 60 a is connected to the signal terminal unit 62. Further, the printed wiring 60 a is connected to the printed wiring 50 a of the wiring unit 50. That is, a power supply path is formed between the control board 60 and the wiring unit 50 through the respective printed wirings 60a and 50a. The printed wiring 60 a is connected to the output terminal 83 of the resolver 80. That is, a signal path is formed between the control board 60 and the resolver 80 for transmitting and receiving a signal indicating the rotation angle of the rotor 33 through the output terminal 83 and the printed wiring 60a. In addition, electronic components 61 are connected to the printed wiring 60a.

  As shown in FIGS. 1 and 2, the module 70 is formed in a rectangular shape (rectangular shape) having a long side and a short side. The physique (surface area) of the module 70 is set smaller than each of the wiring part 50 and the control board 60. That is, the physique of the module 70 is smaller than one wiring control board configured by the wiring unit 50 and the control board 60. The module 70 is molded with a drive circuit 70a composed of an inverter circuit or the like in which a plurality of switching elements such as FETs are integrated as semiconductor elements. In the module 70, the drive circuit 70a controls power supply to the motor 12 based on an external power supply (for example, supply of drive power of three phases (U phase, V phase, W phase)). A heat radiating plate 71 such as a copper plate is molded on the wiring portion 50 and the control board 60 side of the module 70. The heat radiation plate 71 is molded in the module 70 so that the wiring part 50 and the control board 60 side are exposed. That is, the heat radiating plate 71 protrudes from the module 70 toward the heat sink 40 in the axial direction. A heat radiating surface 71 a that promotes heat radiation of the module 70 is formed on the heat sink 40 side of the heat radiating plate 71. The heat radiating surface 71a is brought into contact with the wiring part 50 and the control board 60 through grease applied to the surface.

  Two wiring terminals 72 are extended in the radial direction (a direction orthogonal to the direction of stacking arrangement) on the wiring unit 50 side in the longitudinal direction of the module 70. Each wiring terminal 72 is connected to the printed wiring 50 a of the wiring unit 50. That is, a power supply path (drive power supply path) is formed in the module 70 through the printed wiring 50 a of the wiring unit 50 and the wiring terminals 72.

  Further, on the wiring portion 50 side in the longitudinal direction of the module 70, the three wiring terminals 73 in addition to the respective wiring terminals 72 are extended in the radial direction (direction orthogonal to the direction in which they are stacked and arranged). Each wiring terminal 73 is connected to the corresponding motor-side bus bar 32 of each phase (U-phase, V-phase, W-phase) via three module bus bars 74. Each module bus bar 74 is arranged on the module 70 side of the wiring section 50 so as to avoid contact with the printed wiring 50a. Each module bus bar 74 advances to the inside of the stator housing 20 through a communication port 41 a formed in the base portion 41. Each module bus bar 74 is connected to the motor-side bus bar 32 inside the stator housing 20. That is, a power supply path (drive power supply path) is formed in the motor 12 through each wiring terminal 73, each module bus bar 74, and the motor-side bus bar 32.

  Further, on the control board 60 side in the longitudinal direction of the module 70, 22 control terminals 75 are extended in a radial direction (a direction orthogonal to the direction in which the modules are arranged in a stacked manner). Each control terminal 75 is connected to a printed wiring 60 a of the control board 60. That is, between the module 70 and the control board 60, a control signal instructing the operation (switching) of the switching element of the inverter circuit through the printed wiring 60 a of the control board 60 and each control terminal 75, and a current value monitored by the inverter circuit A signal path for transmitting and receiving a signal indicating the above is formed.

  As shown in a particularly enlarged view of FIG. 3, the terminals 72, 73, 75 of the module 70 are extended from the longitudinal direction in the radial direction, and then on the surface side facing the wiring portion 50 and the control board 60 of the module 70. It is bent. The terminals 72, 73, and 75 are arranged so as to be sandwiched between the surface of the module 70 facing the wiring unit 50 and the control board 60 and the surface of the wiring unit 50 and control board 60 facing the module 70. Is done. That is, the terminals 72, 73, and 75 are pressed against and contact the wiring unit 50 and the control board 60 by fastening the wiring unit 50 and the control board 60 to the module 70.

  In this case, each wiring terminal 72 abuts on the printed wiring 50 a (power supply path) of the wiring unit 50. That is, the module 70 is electrically connected to the wiring unit 50. Each wiring terminal 73 is in contact with each module bus bar 74. That is, the module 70 is electrically connected to the motor 12. Each control terminal 75 is in contact with a printed wiring 60 a (signal path) of the control board 60. That is, the module 70 is electrically connected to the control board 60. The exposed portion of the heat dissipation plate 71 from the module 70 is sandwiched between the module 70, the wiring portion 50, and the control board 60.

Here, the configuration of the module 70 will be described in more detail.
4 and 5A show the module 70 before being installed on the heat sink 40 (motor unit). On the other hand, FIGS. 5B and 5C show the module 70 in the case of being installed in the heat sink 40 (motor unit). That is, the external configuration (structure) of the module 70 changes before and after the heat sink 40 is installed. 5A to 5C, only the wiring terminal 72 appears on the wiring unit 50 side of the module 70 depending on the position of the cross-sectional line.

  Specifically, as shown in FIGS. 4 and 5A, the terminals 72, 73, and 75 of the module 70 are not bent before the heat sink 40 is installed, and extend almost straight in the radial direction of the module 70. .

  On the other hand, as shown in FIGS. 5B and 5C, when the module 70 is installed on the heat sink 40, the terminals 72, 73, and 75 are bent through the following bending process. . Specifically, in the bending step, first, the terminals 72, 73, and 75 are bent at substantially right angles along the outline of the module 70 toward the heat radiating plate 71 (FIG. 5B). In the next step, the terminals 72, 73, and 75 are bent so that their tips are opposed to each other. In this case, each terminal 72, 73, 75 is further bent at a right angle along the outline of the module 70 (FIG. 5C). As a result, contact surfaces 72 a, 73 a, and 75 a that contact the wiring portion 50 and the control board 60 are formed on the heat dissipation plate 71 side of the terminals 72, 73, and 75, respectively.

  The module 70 in which the terminals 72, 73, and 75 are bent toward the heat radiation plate 71 by the above-described bending process is attached to the heat sink 40 through the following stacking process.

  First, the wiring base 50 and the control board 60 are stacked and arranged on the installation base 43 of the heat sink 40. In this case, with respect to each screw hole 43 a formed in the installation base 43, the wiring portion 50 and each through hole 91 of the control board 60 are positioned so as to coincide with the axial direction. Further, the wiring unit 50 and the control board 60 are positioned so that the electronic component 51 mounted on the wiring unit 50 is accommodated in the accommodation hole 46 formed in the installation base 43. Further, the wiring portion 50 and the control board 60 are positioned so that the respective printed wirings 50a, 60a formed on the wiring portion 50 and the control board 60 face the module 70 side.

  Next, the wiring unit 50 and the control board 60 are stacked and arranged with the module 70 positioned. In this case, each through hole 92 of the module 70 is positioned so as to coincide with the axial direction with respect to each through hole 91 formed in the wiring unit 50 and the control board 60. Further, the module 70 is positioned so that the contact surfaces 72a and 73a of the wiring terminals 72 and 73 face the wiring portion 50 side. Further, the module 70 is positioned so that each contact surface 75a of each control terminal 75 faces the control board 60 side. Thereafter, the module 70 is fastened to the wiring unit 50 and the control board 60 by the screws 101 in a positioned state, and is fixed to the installation base 43 together with the wiring unit 50 and the control board 60. That is, the terminals 72, 73, and 75 of the module 70 are all sandwiched between the module 70, the wiring unit 50, and the control board 60.

  Each screw 101 is tightened with respect to each screw hole 43 a of the heat sink 40. In this case, the terminals 72, 73, and 75 of the module 70 are pressed against the wiring unit 50 and the control board 60. In other words, each contact surface 72 a of each wiring terminal 72 is pressed against the printed wiring 50 a of the wiring unit 50 to form a terminal connection structure that electrically connects the wiring unit 50 and the module 70. Each contact surface 73a of each wiring terminal 73 is pressed against each module bus bar 74 to form a terminal connection structure for electrically connecting the motor 12 and the module 70. Each contact surface 75a of each control terminal 75 is pressed against the printed wiring 60a of the control board 60 to form a terminal connection structure for electrically connecting the control board 60 and the module 70.

  The length of the heat radiating plate 71 protruding toward the heat sink 40 is set to be smaller than the thickness of each terminal 72, 73, 75. That is, as shown particularly in the enlarged view of FIG. 3, the heat radiating surface 71a of the heat radiating plate 71 of the module 70 is inward of the contact surfaces 72a, 73a, 75a of the terminals 72, 73, 75 (FIG. 5). (C) In the middle, it is retracted and arranged. In this case, a gap that can be formed between the heat radiation surface 71a, the wiring portion 50, and the control board 60 is filled with grease as described above.

According to the motor unit of the present embodiment described above, the following operations and effects (1) to (5) are exhibited.
(1) Each wiring terminal 72 and each control terminal 75 of the module 70 are electrically connected to the wiring unit 50 and the control board 60 only by a process of being sandwiched between the module 70, the wiring unit 50, and the control board 60. . Therefore, when electrically connecting each wiring terminal 72 and each control terminal 75 to the wiring part 50 and the control board 60, the process of fixing with solder etc. can be reduced. Therefore, the number of steps for connecting the terminals 72 and 75 of the module 70 can be reduced. Furthermore, the terminals 72 and 75 of the module 70 are all sandwiched between the module 70 and the wiring unit 50 and the control board 60. Therefore, further process reduction is realized.

  (2) In the present embodiment, each contact surface 73 a of each wiring terminal 73 is pressed against each module bus bar 74 to form a terminal connection structure that electrically connects the motor 12 and the module 70. Thereby, when electrically connecting each wiring terminal 73 of the module 70 to each module bus bar 74 (motor 12), the process of fixing with solder etc. can be reduced.

  (3) As in this embodiment, the motor unit itself has many parts in the first place. Therefore, the assembly of the motor unit itself has a large number of steps. However, when the wiring unit 50, the control board 60, and the module 70 are stacked and disposed on the heat sink 40 (in this case, the axial direction of the motor shaft 11) as in the above configuration, Each terminal 72, 73, 75 of the module 70 can be sandwiched between the module 70, the wiring unit 50 and the control board 60.

  On the other hand, when the terminals 72, 73, 75 of the module 70 are extended in the radial direction of the wiring unit 50, the control board 60, and the module 70 as in the present embodiment, they are bent in the direction in which they are stacked. Since it is necessary, at least such a folding step is necessary. However, even if the bending process is necessary, it is clear that the accuracy required for the process is lower and the actual process is less than the case of fixing with solder or the like. Therefore, it is possible to reduce the time and labor required for connecting the terminals 72, 73, 75 of the module 70.

  (4) In the motor unit of the present embodiment, the stacked arrangement is such that the wiring portion 50 and the control board 60 are arranged between the heat sink 40 and the module 70. That is, the wiring part 50, the control board 60, and the module 70 are fastened by being fastened with the screws 101 to the heat sink 40 from the module 70 side.

  Thereby, it is easier to assemble the motor unit with the heat sink 40 than when the module 70 is brought into contact with the wiring unit 50 and the control board 60. The reason is that the physique of the module 70 is made small with respect to one wiring control board comprised by the wiring part 50 and the control board 60. FIG.

  For example, as shown in FIG. 2, in the case of stacking arrangement, when viewed from the direction in which the modules 70 in the axial direction are stacked (in the drawing, the front side of the drawing), even if the module 70 exists in the upper layer of the stack, The wiring part 50 and the control board 60 existing in the circuit board can be easily seen. Therefore, in the stacking and arranging step, it is possible to perform an operation while checking and checking all the states of the module 70, the wiring unit 50, and the control board 60. Therefore, the process of connecting the terminals 72, 73, 75 of the module 70 can be easily performed.

  (5) In the motor unit of the present embodiment, the module 70 has the heat radiating surface 71a on the heat sink 40 side while being laminated. Thereby, regardless of whether or not the module 70 is brought into contact with the heat sink 40, the heat dissipation of the module 70 can be promoted as compared with the case where the heat dissipation surface 71a is not provided. Moreover, even when the module 70 is not brought into contact with the heat sink 40 as in the present embodiment, the heat dissipation of the module 70 can be promoted. Therefore, it is possible to stabilize the operation of the motor unit.

(Second Embodiment)
Next, a second embodiment of the motor unit will be described. Note that the same configurations and the same control contents as those in the embodiment already described are denoted by the same reference numerals, and redundant description thereof is omitted. In the present embodiment, the main difference from the first embodiment is the order of the stacked arrangement of the wiring unit 50, the control board 60, and the module 70.

  As shown in FIG. 6, in the present embodiment, in the installation base 43, the module 70, the wiring unit 50, and the control board 60 are sequentially stacked in the axial direction from the motor 12 side. That is, the stacked arrangement of this embodiment is to arrange the module 70 between the heat sink 40, the wiring unit 50, and the control board 60. In the present embodiment, the accommodation hole 46 can be omitted from the installation base 43 of the heat sink 40.

  And in this embodiment, the direction which bends each terminal 72,73,75 of the module 70 with respect to FIG.5 (b), (c) is made reverse to the axial direction. Specifically, in the bending step, first, the terminals 72, 73, and 75 are bent at substantially right angles along the outline of the module 70 on the side opposite to the heat radiation plate 71. In the next step, the terminals 72, 73, and 75 are bent so that their tips are opposed to each other. In this case, the terminals 72, 73 and 75 are further bent at a right angle along the outline of the module 70. As a result, contact surfaces 72 a, 73 a, and 75 a that contact the wiring portion 50 and the control board 60 are formed on the opposite sides of the terminals 72, 73, and 75 to the heat radiation plate 71, respectively.

  The module 70 in which the terminals 72, 73, and 75 are bent to the opposite side of the heat dissipation plate 71 through the above-described bending process is attached to the heat sink 40 through the following stacking process.

  On the installation base 43 of the heat sink 40, first, the modules 70 are stacked and arranged in a positioned state. In this case, each through hole 92 of the module 70 is positioned so as to coincide with the axial direction with respect to each screw hole 43 a formed in the installation base 43. Further, the module 70 is positioned so that the contact surfaces 72a and 73a of the wiring terminals 72 and 73 face the wiring portion 50 side. Further, the module 70 is positioned so that each contact surface 75a of each control terminal 75 faces the control board 60 side.

  Next, in the module 70, the wiring unit 50 and the control board 60 are stacked and arranged in a positioned state. In this case, with respect to each through hole 92 formed in the module 70, the wiring part 50 and each through hole 91 of the control board 60 are positioned so as to coincide with the axial direction. In addition, the wiring unit 50 and the control board 60 are positioned so that the electronic component 51 mounted on the wiring unit 50 faces the opposite side with respect to the module 70. Further, the wiring part 50 and the control board 60 are positioned so that the printed wirings 50a and 60a formed on the wiring part 50 and the control board 60 face the module 70 side. Thereafter, the wiring unit 50 and the control board 60 are fastened to the module 70 by the screws 101 in a positioned state, and are fixed to the installation base 43 together with the module 70. That is, the terminals 72, 73, and 75 of the module 70 are all sandwiched between the module 70, the wiring unit 50, and the control board 60.

  In addition, as in the first embodiment, the terminals 72, 73, and 75 of the module 70 are pressed against the wiring unit 50 and the control board 60, and the printed wiring 50a of the wiring unit 50 and the printed wiring 60a of the control board 60, respectively. Abut.

According to the motor unit described above, in addition to the operations and effects similar to (1) to (3) and (5) of the first embodiment, the following operations and effects shown in (6) and (7) are provided. Play.
(6) In the motor unit of the present embodiment, the stacked arrangement is such that the module 70 is arranged between the heat sink 40, the wiring unit 50, and the control board 60. That is, the wiring part 50, the control board 60, and the module 70 are fastened by being fastened with the screws 101 to the heat sink 40 from the wiring part 50 and control board 60 side.

  Therefore, the module 70 can be disposed closest to the heat sink 40. That is, since the module can be brought into contact with the heat sink 40, the heat radiation of the module 70 can be preferably promoted. Thereby, when using as a motor unit, the heat dissipation effect of the module 70 can be enhanced, and the operation of the motor unit can be suitably stabilized.

  (7) In the present embodiment, the terminals 72, 73, and 75 do not exist on the side of the module 70 where the heat dissipation plate 71 is exposed. That is, the heat radiating surface 71 a of the heat radiating plate 71 of the module 70 can be in contact with the installation base 43, that is, the heat sink 40 in a face-contact state. In this case, the module 70 can obtain a heat radiation effect that is the same as or more than that of the first embodiment, even if the grease required in the first embodiment is not necessary.

In addition, each said embodiment can also be implemented with the following forms which changed this suitably.
The wiring unit 50 and the control board 60 may be configured as separate boards. For example, a stacked arrangement in which the module 70 is sandwiched between the wiring unit 50 and the control board 60 from both sides in the axial direction may be employed. In this case, in the module 70, the wiring terminals 72 and 73 may be bent toward the wiring portion 50, and the control terminals 75 may be bent toward the control board 60. That is, in the module 70, the terminals 72, 73, and 75 may be bent to different sides instead of the same side, as long as the terminals are sandwiched between substrates or the like so that they can be electrically connected. In addition, in the combination of at least one of the wiring unit 50 and the module 70, the control board 60, and the module 70, the terminal may be sandwiched between the boards and the like so as to be electrically connected.

  -The physique of the module 70 may be larger than one wiring control board, and may be larger than any of the wiring part 50 or each control board 60. In particular, when the physique of the module 70 is larger than one wiring control board, the effect (4) of the first embodiment is the effect of the second embodiment.

  The connection between each wiring terminal 73 of the module 70 and each module bus bar 74 may be fixed with solder or the like. That is, each wiring terminal 73 may be extended almost straight from the module 70 in the radial direction without being bent. Even in this case, the effects (1) and the like are achieved in the above-described embodiments.

  Each terminal 72, 73, 75 of the module 70 may be formed by molding a terminal bent from the manufacturing stage. Further, the terminals 72, 73, 75 may extend in the axial direction of the module 70 from the manufacturing stage. That is, the terminals 72, 73, and 75 do not need to extend in the radial direction from the module 70 before the heat sink 40 is installed. In this case, the bending process can be reduced.

The heat radiating plate 71 may be configured separately from the module 70. Further, the module 70 may not have the heat radiating surface 71a as long as the heat radiating action of the heat sink 40 is sufficient.
-The connection structure of each terminal 72, 73, 75 of the module 70 of each said embodiment is applicable not only to a motor unit but to a generator, a household electronic device, etc.

  The connection structure of each terminal 72, 73, 75 of the module 70 of each of the above embodiments, when used in a motor unit, is the configuration (shape) of the heat sink, the wiring section, the control board, the manner of arrangement of the module, and the motor 12 It is also possible to apply the present invention to a method in which the method for detecting the rotation angle is appropriately changed.

  For example, the wiring unit 50, the control board 60, and the module 70 can be stacked in the radial direction of the motor shaft 11 with respect to the installation base formed in the axial direction of the heat sink 40. Moreover, the installation part 42 of the heat sink 40 may be cylindrical, and the cross section in the radial direction of the motor shaft 11 may be a polygon such as a triangle or a pentagon. The heat sink 40 may be fixed to the stator housing 20 (motor housing 14) with screws or the like. Moreover, you may make it use magnetic sensors, such as a magnet and Hall IC, for the detection of the rotation angle of the motor 12. FIG. Moreover, in the motor unit, if it has the structure which can arrange | position a wiring part, a control board, and a module, it may replace with the heat sink 40 and may use cooling structures, such as air cooling by a fan (fan), for example.

  DESCRIPTION OF SYMBOLS 11 ... Motor shaft, 12 ... Motor, 40 ... Heat sink, 42 ... Installation part, 43 ... Installation base, 50 ... Wiring part, 50a ... Printed wiring, 53 ... Coil component, 53a ... 1st common mode coil, 53b ... 2nd Common mode coil 60 ... control board 60a ... printed wiring 70 ... module 71 ... heat dissipation plate 71a ... heat dissipation surface 72, 73, 75 ... terminal, 72a, 73a, 75a ... contact surface.

Claims (5)

In a connection structure of terminals for electrically connecting a module that controls power supply from a power source to a motor and a wiring part that forms a power supply path from the power source to the motor or a control board that controls the operation of the module ,
The module has terminals by integrating semiconductor elements,
The terminal of the module has a connection structure that is electrically connected to the wiring section or the control board by being sandwiched between the module and the wiring section or the control board. Connection structure. The module connected by the terminal connection structure according to claim 1, the wiring unit, and the control board;
A motor having a motor shaft;
A heat sink that houses the motor shaft and has a function of promoting heat dissipation, and
The module, the wiring unit, and the control board are stacked in the axial direction of the motor shaft with respect to the heat sink,
The terminal of the module is sandwiched between the module and the wiring section or the control board by being extended in the radial direction of the motor shaft in the module and then bent to the wiring section or the control board side. Configured to be
A motor unit formed by unitizing the module, the wiring section, the control board, the motor, and the heat sink. The stacked arrangement is to arrange the wiring portion or the control board between the heat sink and the module,
The motor unit according to claim 2, wherein the wiring unit or the control board and the module are fastened by a fastening force applied to the heat sink from the module side. The stacked arrangement is to arrange the module between the heat sink and the wiring portion or the control board,
The motor unit according to claim 2, wherein the wiring part or the control board and the module are fastened by a fastening force applied to the heat sink from the wiring part or the control board side.   The motor unit according to any one of claims 2 to 4, wherein the module is arranged in a stacked manner and has a heat dissipation surface on the heat sink side.