JP2013223322A - Rotary electric machine and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary electric machine that connects external power supply terminals to bus bars via a coupling member manufactured of a material more flexible than materials of the external power supply terminals and the bus bars and can reduce a number of components and assembling man-hours at the time of assembly of a wire connection unit.SOLUTION: External power supply terminals 32U, 32V, and 32W are connected to bus bars 31U, 31V, and 31W via a coupling member 35. The coupling member 35 is manufactured of a material more flexible than those of the bus bars 31U, 31V, and 31W and the external power supply terminals 32U, 32V, and 32W. The external power supply terminals 32U, 32V, and 32W with the coupling member 35 bent extend from a radial direction other side of a base portion 31b to a shaft direction outward. Joint portions among coil terminals 24a and 24b and coil connection terminals 32a and 32b are positioned closer to the shaft direction outward than a joint portion between a connection portion 32d and the coupling member 35.

Description

  The present invention relates to a rotating electrical machine applied to, for example, a motor for a vehicle and a manufacturing method thereof, and more particularly to a connection unit structure for connecting coils constituting a stator coil.

  In the conventional rotating electric machine, each of the coil connection terminals has a strip-shaped conductive portion, and is integrated with the strip-shaped conductive portion and extends substantially parallel to the longitudinal direction from the side end of the strip-shaped conductive portion. A plurality of conductive members bent in the plate thickness direction and a plurality of concentric groove portions, the strip-like conductive portions are concentrically accommodated in the respective groove portions, and the coil connection terminals are radially arranged from the groove portions. A holder made of an insulating material that extends to hold a plurality of conductive members and a plurality of wound coils are provided, and a predetermined connection is made by connecting a coil terminal of the coil to a coil connection terminal ( For example, see Patent Document 1).

  In this conventional rotating electrical machine, the external power supply terminal to which external power is supplied and the conductive member are separately manufactured to increase the material yield. The external power supply terminal is connected to the conductive member by welding or the like before being housed in the holder. When each of the plurality of conductive members is stored in the plurality of concentric grooves of the holder, the external power supply terminal of the conductive member previously stored in the groove does not interfere with the conductive member stored in the groove later. It was extended in the axial direction from the conductive member.

JP 2003-324883 A

In the conventional rotating electrical machine, the external power supply terminal extends in the axial direction from each of the conductive members. Therefore, it is necessary to guide the external power supply terminal to a predetermined radial position (power supply position). Therefore, after incorporating a plurality of conductive members into the holder, it is necessary to connect a wiring member for guiding the external power supply terminal to a predetermined radial position to the external power supply terminal. The number of parts and the number of assembly steps when assembling the conductive member There was a problem that increased.
In addition, since the external power supply terminal extends in the axial direction, the flow immersion method cannot be used to insulate the joint between the coil connection terminal and the coil terminal, and the insulation at the joint between the coil connection terminal and the coil terminal cannot be used. There was also a problem that the processing became complicated.

  The present invention has been made in order to solve the above-described problem. By connecting the external power supply terminal to the bus bar via a connection member that is more flexible than the material of the bus bar and the external power supply terminal, and bending the connection member, the bus bar is provided. Assembling the wiring unit, the external power supply terminal can be positioned at the non-interference position when assembled into the insulation holder, and the external power supply terminal can be positioned at the specified radial position after the assembly of the bus bar into the insulation holder is completed. An object of the present invention is to obtain a rotating electrical machine that can reduce the number of parts and assembly man-hours at the time, and that can easily insulate the joint between a coil connection terminal and a coil terminal by using a fluid immersion method, and a method for manufacturing the same.

  The rotating electrical machine according to the present invention includes a housing, a rotor rotatably supported on the shaft and disposed in the housing, and a plurality of teeth, each having a diameter from the inner peripheral wall surface of the annular core back. A stator core that protrudes inward in the direction and is arranged at a predetermined pitch in the circumferential direction, and a stator coil that includes a plurality of concentrated winding coils wound around each of the teeth, and surrounds the rotor And a connection unit that is disposed on one end side in the axial direction of the stator and performs predetermined connection of the plurality of concentrated winding coils. The connection unit includes an annular insulating holder in which a plurality of bus bar storage grooves are concentrically recessed, and a rectangular cross section stored in each of the plurality of bus bar storage grooves by bending a belt-shaped flat plate in the thickness direction. And a base portion of the base portion that is bent in the thickness direction from one side in the width direction and extends to one side in the radial direction, is arranged at a predetermined interval in the circumferential direction of the base portion, and is connected to the coil terminal of the concentrated winding coil A plurality of bus bars each having a plurality of coil connection terminals having a rectangular cross section and provided corresponding to each phase of the stator coil; and a plurality of external power supply terminals each connected to the plurality of bus bars via a connecting member; It is equipped with. An insulating coating is fused to the joint between the coil connection terminal and the coil terminal, the connection member is made of a material that is more easily bent than the bus bar and the external power supply terminal, and the plurality of external power supply terminals are connected to the connection terminal. The member is bent to extend outward in the axial direction from the other radial side of the base, and the joint between the coil connection terminal and the coil terminal is axially outside the joint between the bus bar and the connecting member. It is located in the direction.

  According to this invention, the connecting member is made of a material that is more easily bent than the bus bar and the external power supply terminal. Therefore, even if the external power supply terminal is connected to the bus bar via the connecting member in advance, the external power supply terminal can be positioned at the non-interference position by bending the connecting member when the bus bar is assembled into the insulating holder. Therefore, the bus bar can be attached to the insulating holder without being obstructed by the external power supply terminal previously attached to the insulating holder. Thereby, the number of parts at the time of an assembly of a connection unit and an assembly man-hour can be reduced.

  Further, when the insulating coating is fused to the joint between the coil connection terminal and the coil terminal by the flow dipping method, the connecting member is bent so that the external power feeding terminal is located in the axial direction from the joint between the coil connection terminal and the coil terminal. Can be located in the direction. As a result, it is possible to easily avoid a situation in which the external power supply terminal does not touch the insulating powder flowing in the tank and the insulating coating is fused to the external power supply terminal.

It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is an end elevation which shows the state which attached the connection unit to the stator in the rotary electric machine which concerns on Embodiment 1 of this invention. It is an end view of the stator in the rotary electric machine according to Embodiment 1 of the present invention. It is principal part sectional drawing which shows the state which mounted | wore the stator in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a VV arrow sectional view of Drawing 4. It is a perspective view which shows the core unit of the stator in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a connection diagram of the stator coil in the rotary electric machine according to Embodiment 1 of the present invention. It is an end elevation which shows the bus bar applied to the connection unit of the stator coil in the rotary electric machine which concerns on Embodiment 1 of this invention. It is process drawing explaining the shaping | molding method of the bus bar applied to the stator coil connection unit in the rotary electric machine which concerns on Embodiment 1 of this invention. It is process drawing explaining the mounting method to the insulation holder of the bus bar in the rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing explaining the insulation processing method of the coil junction part in the rotary electric machine which concerns on Embodiment 1 of this invention. It is principal part sectional drawing which shows the state which attached the connection knit to the stator in the rotary electric machine which concerns on Embodiment 2 of this invention. It is XIII-XIII arrow sectional drawing of FIG. It is a principal part top view which shows the connection member applied to the connection unit in the rotary electric machine which concerns on Embodiment 3 of this invention.

  Hereinafter, preferred embodiments of a rotating electrical machine and a manufacturing method thereof according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a cross-sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention, FIG. 2 is an end view showing a state where a connection unit is mounted on a stator in the rotating electrical machine according to Embodiment 1 of the present invention, and FIG. FIG. 4 is an end view of the stator in the rotary electric machine according to Embodiment 1 of the present invention, FIG. 4 is a cross-sectional view of the main part showing a state where the connection unit is mounted on the stator in the rotary electric machine according to Embodiment 1 of the present invention, 4 is a sectional view taken along arrows V-V in FIG. 4, FIG. 6 is a perspective view showing a core unit of a stator in the rotary electric machine according to Embodiment 1 of the present invention, and FIG. 7 is in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 8 is an end view showing the bus bar applied to the stator coil connection unit in the rotary electric machine according to Embodiment 1 of the present invention, and FIG. 9 is a circuit diagram of the stator coil connection according to Embodiment 1 of the present invention. FIG. 10 is a process diagram for explaining a method for forming a bus bar applied to a stator coil connection unit in an electric machine, and FIG. 10 is a process diagram for explaining a method for mounting a bus bar to an insulating holder in a rotary electric machine according to Embodiment 1 of the present invention; FIG. 11 is a cross-sectional view illustrating a method for insulating a coil joint portion in the rotary electric machine according to Embodiment 1 of the present invention.

  In FIG. 1, a rotating electrical machine 100 includes a housing 1, a rotor 6 rotatably disposed in the housing 1, a stator 20 held in the housing 1 so as to surround the rotor 6, and a shaft of the stator 20. A connection unit 30 disposed at one end in the direction.

  The housing 1 is clamped between the first and second brackets 2 and 3 and the first and second brackets 2 and 3 from both sides in the axial direction and tightens the bolts 5 that fasten the first and second brackets 2 and 3. And a metal cylindrical frame 4 held by the first and second brackets 2 and 3.

  The rotor 6 includes, for example, a rotor core 7 having an 8-pole magnet 8 fixed to the outer peripheral surface thereof by adhesion, a shaft 9 inserted and fixed in the axial center position of the rotor core 7, and fixed to both axial end surfaces of the rotor core 7. The cooling fan 10 is provided. The rotor 6 is rotatably disposed in the housing 1 with the shaft 9 being rotatably supported by first and second bearings 11 and 12 provided in the first and second brackets 2 and 3. .

  The stator 20 includes an annular stator core 21 and a stator coil 23 wound around the stator core 21. As will be described later, the stator coil 23 includes twelve concentrated winding coils 24. The twelve concentrated winding coils 24 are connected by a connection unit 30 disposed at the shaft end of the stator 20, and are shown in FIG. As shown in the figure, each of the four concentrated winding coils 24 is configured as a three-phase AC winding formed by Y-connecting a U-phase winding, a V-phase winding, and a W-phase winding.

  Next, the configuration of the stator 20 will be specifically described.

  As shown in FIGS. 2 and 3, the stator core 21 includes a core back portion 22a having a circular arc cross section, and teeth 22b projecting radially inward from the circumferential center of the inner peripheral surface of the core back portion 22a. Twelve core blocks 22 each having a T-shaped cross section are arranged in the circumferential direction to form an annular shape.

  The coil bobbin 26 is a resin molded body of an insulating resin such as nylon, and is disposed at both axial ends of the core block 22. As shown in FIG. 6, the concentrated winding coil 24 is produced by winding a conductor wire coated with insulation around the teeth 22 b and the coil bobbin 26 of the core block 22 a predetermined number of times.

  The stator 20 includes twelve core blocks 22 around which concentrated winding coils 24 are wound, the circumferential side surfaces of the core back portion 22a are aligned with each other in the circumferential direction, and inserted into the cylindrical frame 4 for baking. It is made by fixing it with a screw. In the stator 20 configured as described above, the two coil terminals 24 a and 24 b extend from one of the concentrated winding coils 24 to one side in the axial direction. The core back portions 22a are arranged in a row in the circumferential direction to constitute an annular core back of the stator core 21.

  Next, the configuration of the connection unit 30 will be described with reference to FIGS. 2, 4, 5, 8, and 9.

  As shown in FIGS. 2, 4 and 8, the connection unit 30 includes a plurality of bus bars 31N, 31U, 31V, 31W for performing predetermined connection of the concentrated winding coil 24, and a plurality of bus bars 31N, 31U, 31V, And an insulating holder 33 for storing and holding 31W.

  The bus bar 31N is a bus bar for neutral point connection, and as shown in FIG. 8A, an annular base 31a formed by bending a strip-shaped flat plate in the thickness direction, and the width direction of the base 31a, respectively. And 12 coil connection terminals 32a that are bent in the thickness direction from one side and extend outward in the radial direction, and are arranged at an equiangular pitch in the circumferential direction.

  The bus bar 31U is a bus bar for U-phase connection, and as shown in FIG. 8B, the bus bar 31U is formed by bending a belt-like flat plate in the thickness direction, and has a missing portion 32c in which a part of an arc is missing. An incomplete annular base 31b having a smaller diameter than the base 31a of the bus bar 31N, and each of the bases 31b are bent in the thickness direction from one side in the width direction and extend outward in the radial direction. The coil connection terminal 32b, the connection portion 32d extending in the width direction from one side in the width direction of the base portion 31b, and the connecting member 35 having one end joined to the connection portion 32d by welding or the like and extending inward in the radial direction. And. An external power supply terminal 32U formed by bending a belt-like flat plate into an L shape is joined to the other end of the connecting member 35 by welding or the like and extends in the axial direction.

  The bus bar 31V is a bus bar for V-phase connection, and as shown in FIG. 8C, the bus bar 31B is formed by bending a belt-like flat plate in the thickness direction and has a missing portion 32c in which a part of an arc is missing. An incomplete annular base 31b having a smaller diameter than the base 31b of 31U is bent in the thickness direction from one side in the width direction of each base 31b and extends outward in the radial direction, and four are arranged at an equiangular pitch in the circumferential direction. A coil connecting terminal 32b, a connecting portion 32d extending in the width direction from one side in the width direction of the base portion 31b, and a connecting member 35 having one end joined to the connecting portion 32d by welding or the like and extending radially inward. It is equipped with. An external power supply terminal 32V formed by bending the belt-like flat plate into an L shape is joined to the other end of the connecting member 35 by welding or the like and extends in the axial direction.

  The bus bar 31W is a bus bar for W-phase connection, and is formed by bending a belt-like flat plate in the thickness direction as shown in FIG. An incomplete annular base 31b having a smaller diameter than the base 31b of the bus bar 31V, and each of the bases 31b are bent in the thickness direction from one side in the width direction and extend outward in the radial direction. The coil connection terminal 32b, the connection portion 32d extending in the width direction from one side in the width direction of the base portion 31b, and the connecting member 35 having one end joined to the connection portion 32d by welding or the like and extending inward in the radial direction. And. An external power supply terminal 32W formed by bending a belt-like flat plate into an L shape is joined to the other end of the connecting member 35 by welding or the like and extends in the axial direction.

The circumferential direction of the base portions 31a and 31b corresponds to the length direction of the strip-shaped flat plate, and the thickness direction and the width direction of the base portions 31a and 31b are a short side in a rectangular cross section orthogonal to the length direction of the strip-shaped flat plate and Corresponds to the direction along the long side.
Further, the connecting member 35 is made of a material that is easier to bend than the conductive member that is the material of the bus bars 31U, 31V, 31W and the external power supply terminals 32U, 32V, 32W, for example, a twisted copper wire as shown in FIG. Has been.

  Here, a manufacturing method of the bus bar 31U using a press molding machine (not shown) will be described with reference to FIG.

  First, as shown in FIG. 9 (a), the coil connection terminal 32b and the connection portion 32d have a predetermined length extending from one side in the width direction from a strip-shaped conductive member made of a copper plate having a thickness of about 1 mm. The base 31b of the belt-like flat plate is punched out. Next, as shown in FIG. 9B, the base portion 31b is bent in the thickness direction to form an incomplete annular shape with a part of the arc missing. Next, as shown in FIG. 9C, each of the coil connection terminals 32b is bent at a right angle in the thickness direction and extended outward in the radial direction. Further, as shown in FIG. 9D, the respective distal ends of the coil connection terminals 32b are bent at right angles in the thickness direction. Next, one end of the connecting member 35 having the external power supply terminal 32U connected to the other end by welding is welded to the connection portion 32d. Then, the connecting member 35 is bent at a right angle and extended radially inward. Thereby, the bus bar 31U extending in the axial direction from the external power supply terminal 32U is obtained. The base 31b, the coil connection terminal 32b, and the external power supply terminal 32U have a rectangular cross section (cross-sectional rectangle).

For convenience of explanation, the manufacturing process of the bus bar 31U is described as being divided into a plurality of processes. However, the bending process of the base 31b and the bending process of the coil connection terminal 32b may be performed simultaneously.
In addition, the bus bars 31N, 31V, 31W are produced in the same manner, and the description thereof is omitted here.

  As shown in FIGS. 2 and 4, the insulating holder 33 is manufactured in an annular shape using an insulating resin such as nylon, and four annular bus bar housing grooves 34 are concentrically recessed. The four bus bar storage grooves 34 are formed in the insulating holder 33 so that the base portions 31a and 31b of the bus bars 31N, 31U, 31V, and 31W can be stored, respectively.

  Next, a method of attaching the bus bars 31N, 31U, 31V, 31W to the insulating holder 33 will be described with reference to FIG.

  First, the base 31a of the bus bar 31N is inserted into the bus bar housing groove 34 located on the outermost periphery, and the bus bar 31N is mounted on the insulating holder 33. Next, the base 31 b of the bus bar 31 U is inserted into the second bus bar housing groove 34 from the outer peripheral side, and the bus bar 31 U is attached to the insulating holder 33. At this time, as shown in FIG. 10A, the connecting member 35 of the bus bar 31U is bent at a right angle and extends radially inward, and the external power supply terminal 32U extends axially outward. . Therefore, as shown in FIG. 10B, the bent portion of the connecting member 35 of the bus bar 31U is extended to extend outward in the axial direction from the base portion 31b, and the external power supply terminal 32U is extended outward in the radial direction. Let As a result, the external power supply terminal 32U is retracted to a non-interference position that does not interfere with the bus bar 31V attached to the insulating holder 33. Therefore, the base 31b of the bus bar 31V is inserted into the third bus bar housing groove 34 from the outer peripheral side, and the bus bar 31V is attached to the insulating holder 33.

  Next, the bent portion of the connecting member 35 of the bus bar 31V is extended to extend outward in the axial direction from the base portion 31b, and the external power supply terminal 32V is extended radially outward, and then the base portion 31b of the bus bar 31W is moved to the outer peripheral side. Are inserted into the fourth bus bar housing groove 34, and the bus bar 31 </ b> W is attached to the insulating holder 33. Thereafter, as shown in FIG. 10C, the connecting members 35 of the bus bars 31U and 31V are bent at right angles and extended radially inward, and the external power supply terminals 32U and 32V extend axially outward. Let

  Accordingly, the bus bars 31N, 31U, 31V, 31W are assembled to the insulating holder 33. Then, 12 pairs of coil connection terminals 32a and 32b extending radially outward from the insulating holder 33 are arranged at an equiangular pitch. Three connecting members 35 are adjacent to each other in the circumferential direction and extend radially inward from the insulating holder 33, and the external power supply terminals 32 </ b> U, 32 </ b> V, and 32 </ b> W extend from the radially inner side of the insulating holder 33 to the axially outer side. Yes.

  The connection unit 30 thus manufactured is disposed at one end of the stator 20 in the axial direction, the coil terminal 24a of the concentrated winding coil 24 is connected to the coil connection terminal 32a, and the coil terminal 24b is connected to the coil connection terminal 32b. The As a result, as shown in FIG. 7, a three-phase AC winding formed by Y-connecting a U-phase winding, a V-phase winding, and a W-phase winding each having four concentrated winding coils 24 connected in parallel is provided. Composed.

  The joint portions between the coil terminals 24 a and 24 b and the coil connection terminals 32 a and 32 b are located outward in the axial direction from the joint portion between the connection portion 32 d and the connecting member 35. Therefore, as shown in FIG. 11, the connecting member 35 is bent so that the external power supply terminals 32U, 32V, and 32W are positioned inward in the axial direction from the joint between the coil terminals 24a and 24b and the coil connection terminals 32a and 32b. . Then, the assembly of the connection unit 30 and the stator 20 is preheated, the assembly is moved in the axial direction of the stator 30, and the joint portions of the coil terminals 24 a and 24 b and the coil connection terminals 32 a and 32 b are connected to the tank 40. It is immersed in an insulating powder 41 such as epoxy flowing inside, and the insulating powder 41 is fused to the surface of the joint portion to form an insulating coating. Thereafter, the assembly of the connection unit 30 and the stator 20 may be heated.

  Next, the assembly is moved in the axial direction, and the joint portions between the coil terminals 24 a and 24 b and the coil connection terminals 32 a and 32 b are pulled out from the insulating powder 41 flowing in the tank 40. Then, the connecting member 35 is bent to extend the external power supply terminals 32U, 32V, and 32W from the radially inner side of the base portion 31b to the axially outer side.

  In the rotating electrical machine 100 configured as described above, AC power is supplied from the external power source to the stator coil 23 via the external power supply terminals 32U, 32V, and 32W, and the rotor 6 is rotationally driven. The rotating electrical machine 100 operates as an inner rotor type three-phase motor having 8 magnetic poles and 12 slots.

  According to the first embodiment, the external power supply terminals 32U, 32V, and 32W are connected to the connection portions 32d of the base portions 31b of the bus bars 31U, 31V, and 31W via the connection members 35, and the connection members 35 are connected to the bus bars 31U, 31V, and 31B. It is made of a material that is more easily bent than 31W and the external power supply terminals 32U, 32V, and 32W. Therefore, prior to the assembly of the connection unit 30, the external power supply terminals 32U, 32V, 32W are connected to the bus bars 31U, 31V, 31W, and when the bus bars 31U, 31V, 31W are attached to the insulating holder 33, the connecting member 35 is connected. Can be bent, and the external power supply terminals 32U, 32V, and 31W previously mounted can be retracted to the non-interference position.

  As a result, the external power supply terminals 32U, 32V, and 32W can be connected to the bus bars 31U, 31V, and 31W before being incorporated into the insulating holder 33, so that the connection work space can be widened and the work efficiency can be improved. In addition, the number of parts and the number of assembly steps can be reduced when assembling the connection unit 30. Furthermore, since the bus bars 31V and 31W can be attached to the insulating holder 33 without being obstructed by the external power supply terminals 32U and 32V previously attached, the assembling property of the connection unit 30 is improved and the cost is reduced. .

Since the connecting member 35 is made of a stranded copper wire, the flexibility of the connecting member 35 is improved. Therefore, the position adjustment work of the external power supply terminals 32U, 32V, 32W and the retreat work to the non-interference position are simplified.
Since the insulating coating is formed at the joint between the coil terminals 24a and 24b and the coil connection terminals 32a and 32b, the electrical insulation is improved.

  The joints between the coil terminals 24 a and 24 b and the coil connection terminals 32 a and 32 b are located outward in the axial direction from the joint between the connection part 32 d and the connecting member 35. Therefore, the connecting member 35 can be bent so that the external power supply terminals 32U, 32V, and 32W can be positioned axially inward from the joint between the coil terminals 24a and 24b and the coil connection terminals 32a and 32b. As a result, an insulating coating is simply applied to the joint between the coil terminals 24a, 24b and the coil connection terminals 32a, 32b without forming an insulating coating on the external power supply terminals 32U, 32V, 32W by using a fluid dipping method or the like. Can be formed.

Embodiment 2. FIG.
12 is a cross-sectional view of a principal part showing a state in which a wiring unit is mounted on a stator in a rotary electric machine according to Embodiment 2 of the present invention, and FIG. 13 is a cross-sectional view taken along arrow XIII-XIII in FIG.

12 and 13, the connecting member 36 is configured by laminating a plurality of thin copper plates that are thinner than the thickness of the copper plate that is the material of the bus bars 31U, 31V, 31W and the external power supply terminals 32U, 32V, 32W. It is easier to bend than the bus bars 31U, 31V, 31W and the external power supply terminals 32U, 32V, 32W.
In the second embodiment, the above-described embodiment is used except that a connecting member 36 made by laminating a plurality of thin copper thin plates is used in place of the connecting member 35 made of a twisted copper wire. It is comprised similarly to the form 1 of.

Also in the second embodiment, the connecting member 36 is configured by laminating a plurality of thin copper plates that are thinner than the thickness of the copper plate that is the material of the bus bars 31U, 31V, 31W and the external power supply terminals 32U, 32V, 32W. The connecting member 36 can be easily bent in the thickness direction, and the same effect as in the first embodiment can be obtained.
Since the connecting member 36 is configured by laminating a plurality of thin copper plates, the bending direction is determined. As a result, the extension positions in the axial direction of the external power supply terminals 32U, 32V, and 32W are determined, and the assembly can be easily automated. Further, the connecting member 36 can be made thinner than the connecting member 35 formed of a stranded wire, and space saving can be achieved.

  In the second embodiment, the joining of the connecting member 36 and the connecting portion 32d and the joining of the connecting member 36 and the external power supply terminals 32U, 32V, 32W are performed by ultrasonic welding. Therefore, the work space for welding can be reduced, and the laminated copper thin plates can be easily welded together.

Embodiment 3 FIG.
FIG. 14 is a plan view of relevant parts showing a connecting member applied to a connection unit in a rotary electric machine according to Embodiment 3 of the present invention.

In FIG. 14, the connecting member 36 </ b> A is configured by forming notches 37 on both sides of the connecting member 36 in the width direction.
The third embodiment is configured in the same manner as in the second embodiment except that a connecting member 36A having a notch 37 is used instead of the connecting member 36.

Also in the third embodiment, the connecting member 36A is formed by laminating a plurality of copper thin plates that are thinner than the thickness of the copper plate that is the material of the bus bars 31U, 31V, 31W and the external power supply terminals 32U, 32V, 32W. The connecting member 36A can be easily bent in the thickness direction, and the same effect as in the second embodiment can be obtained.
Since the notches 37 are formed on both sides of the connecting member 36 </ b> A in the width direction, the connecting member 36 </ b> A is easily bent at the position where the notch 37 is formed. Therefore, the bending position of the connecting member 36A can be controlled, and the degree of freedom in layout is increased.

In each of the above embodiments, the ratio of the number of magnetic poles to the number of slots in the rotating electrical machine is 8:12, that is, the pole slot ratio is 2: 3, but the pole slot ratio is not limited to 2: 3. For example, it may be 4: 3.
Moreover, in each said embodiment, although the stator core shall be comprised by the several core block, a stator core may be produced by the integral thing. In this case, the cylindrical frame holding the stator core can be omitted.

Moreover, in each said embodiment, although the connection member shall be connected to the connection part protrudingly provided by the base part of the bus-bar, a connection part is abbreviate | omitted and it connects so that a connection member may be directly connected to the base part of a bus-bar. Also good.
In each of the above embodiments, the coil terminal of the concentrated winding coil and the coil connection terminal of the bus bar are connected radially outward of the base portion of the bus bar, and the external power supply terminal is axially extended from the radially inner side of the base portion of the bus bar. Although it is supposed to extend outward, the coil terminal of the concentrated winding coil and the coil connection terminal of the bus bar are connected radially inward of the base of the bus bar, and the external power supply terminal is connected from the radial outward of the base of the bus bar. It may be extended outward in the axial direction.

Further, in each of the above embodiments, the base portion of the bus bar is made to be an incomplete annular shape having a missing portion, but the shape of the base portion is not limited to the incomplete annular shape, and may be an annular shape. It may be divided into arc shapes.
Further, in each of the above embodiments, it is assumed that a U-phase winding, a V-phase winding and a W-phase winding each having four concentrated winding coils connected in parallel are Y-connected to form a three-phase AC winding. However, the connection form of the concentrated winding coil is not limited to this. For example, the U-phase winding, the V-phase winding, and the W-phase winding in which two concentrated winding coils are connected in parallel to each other are connected to the Y-connection. A set of three-phase AC windings may be configured. Therefore, the configuration of the connection unit is appropriately designed according to the connection form of the concentrated winding coil.

  DESCRIPTION OF SYMBOLS 1 Housing, 6 Rotor, 9 Shaft, 20 Stator, 21 Stator core, 22a Core back part, 22b Teeth, 23 Stator coil, 24 Concentrated winding coil, 24b Coil terminal, 30 Connection unit, 31U, 31V, 31W Bus bar, 31b Base part, 32b Coil connection terminal, 32U, 32V, 32W External power supply terminal, 33 Insulation holder, 34 Bus bar storage groove, 35, 36, 36A Connecting member, 37 Notch.

Claims (6)

A housing;
A rotor rotatably supported by the housing and disposed in the housing;
A plurality of teeth project radially inward from the inner circumferential wall surface of the annular core back, and are arranged at a predetermined pitch in the circumferential direction, and a plurality of teeth wound around each of the teeth. A stator coil having a concentrated winding coil, and a stator held in the housing so as to surround the rotor;
A rotating electrical machine including a connection unit disposed on one end side in the axial direction of the stator and performing predetermined connection of the plurality of concentrated winding coils;
The above wiring unit is
An annular insulating holder in which a plurality of bus bar storage grooves are concentrically recessed;
Each of the strip-shaped flat plates is bent in the thickness direction, and has a base having a rectangular cross section stored in each of the plurality of bus bar storage grooves, and is bent in the thickness direction from one side in the width direction of the base and extends to one side in the radial direction. A plurality of coil connection terminals arranged in a circumferential direction of the base portion at a predetermined interval and connected to the coil terminal of the concentrated winding coil, and provided corresponding to each phase of the stator coil. Multiple busbars,
Each having a plurality of external power supply terminals connected to the plurality of bus bars via coupling members,
An insulating coating is fused to the joint between the coil connection terminal and the coil terminal;
The connecting member is made of a material that is more easily bent than the bus bar and the external power supply terminal,
The plurality of external power supply terminals are bent in the connecting member and extend outward in the axial direction from the other radial side of the base,
The rotating electrical machine characterized in that a joint portion between the coil connection terminal and the coil terminal is located axially outward from a joint portion between the bus bar and the connecting member.   The rotating electrical machine according to claim 1, wherein the connecting member is made of a stranded wire of a metal wire.   The rotating electrical machine according to claim 1, wherein the connecting member is made by laminating metal flat plates.   The rotating electrical machine according to claim 3, wherein a notch is formed in a part of the connecting member.   The rotating electrical machine according to any one of claims 1 to 4, wherein the bus bar and the connecting member, and the external power feeding terminal and the connecting member are connected by ultrasonic welding. A method of manufacturing a rotating electrical machine according to any one of claims 1 to 5,
Connecting the plurality of external power supply terminals to the plurality of bus bars via the connecting member;
Attaching the plurality of bus bars connected to the external power supply terminals to the insulating holder to produce the connection unit;
Arranging the connection unit on one end side in the axial direction of the stator, and connecting the plurality of coil connection terminals and coil terminals of the concentrated winding coil;
Bending the connecting member to position the plurality of external power supply terminals axially inward from the joint between the coil connection terminal and the coil terminal;
The assembly of the stator and the connection unit is heated, and then the plurality of external power supply terminals do not touch the insulating powder flowing in the tank, and the joint between the coil connection terminal and the coil terminal is the tank. Moving the assembly in the axial direction of the stator so as to be immersed in the insulating powder flowing in the interior, and fusing an insulating coating to the joint between the coil connection terminal and the coil terminal;
The assembly is moved so that the joint between the coil connection terminal and the coil terminal is pulled out from the insulating powder flowing in the tank, the connecting member is bent, and the plurality of external power feed terminals are connected to the base portion in diameter. And a step of extending outward in the axial direction from the other side of the direction.

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