Bus bar module

Abstract

To properly bond a power line bus bar and a relay terminal fixed to a bus bar holder.SOLUTION: In a bus bar module, a power line bus bar 71 is fixed to a bus bar holder 74 with a plurality of press-fitting fixation parts 82, and a relay terminal 73 is also fixed with a press-fitting fixation part 102. In this state, a bonding terminal part 85 of the power line bus bar 71 and a bonding terminal part 104 of the relay terminal 73 are bonded to each other. One of the press-fitting fixation parts 82 is a first fixation part 82A disposed near the bonding terminal part 85, and the remaining press-fitting fixation parts 82 are second fixation parts 82B that are farther from the bonding terminal part 85 than the first fixation part 82A. The first fixation part 82A is provided with a circumferential-direction positioning part (projection 121) for positioning the power line bus bar 71 in a circumferential direction whereas none of the second fixation parts 82B is provided with a circumferential-direction positioning part.SELECTED DRAWING: Figure 24

Description

[Technical field]

[0001] The present invention relates to a bus bar module. [Background technology]

[0002] In a known configuration of a stator of a rotating electric machine, a power line bus bar is connected to each phase winding of a stator winding, and a relay terminal for power supply is connected to each power line bus bar (see, for example, Patent Document 1). In this configuration, the power line bus bar and the relay terminal of each phase are fixed to a bus bar holder made of an insulating material, and a joint provided on the power line bus bar and a joint provided on the relay terminal are joined by welding or the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6851920 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the positions of the joints of the power line busbar and the relay terminal fixed to the busbar holder are misaligned, there is a concern that poor connection may occur. For example, when the fixing portion of the power line busbar is inserted into an insertion hole provided in the busbar holder to fix the power line busbar, it is desirable to leave some space in the insertion hole in consideration of ease of assembly, etc. In this case, if the position of the power line busbar is misaligned due to the space provided in the insertion hole, there is a concern that poor connection may occur due to the misalignment of the joints of the power line busbar and the relay terminal.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a busbar module that can properly join a power line busbar and a relay terminal fixed to a busbar holder. [Means for solving the problem]

[0006] The means for solving the above problems and their effects will be described below.

[0007] Method 1 is: A power line bus bar provided for each phase winding of the stator winding; a relay terminal provided for each of the power line bus bars of each phase and connected to the power line bus bar; a bus bar holder that holds the power line bus bar and the relay terminal; A busbar module arranged on an axial end side of a cylindrical stator, the power line bus bar has an arc shape extending in a circumferential direction, and includes a plurality of bus bar fixing portions that are fixed to the bus bar holder at a plurality of locations spaced apart from one another in the circumferential direction, and a bus bar joint portion that is a joint portion with the relay terminal, the relay terminal has a terminal fixing portion fixed to the bus bar holder, and a terminal joint portion which is a joint portion with the power line bus bar, the power line bus bar is fixed to the bus bar holder by the plurality of bus bar fixing portions, and the relay terminal is fixed to the bus bar holder by the terminal fixing portion, and in this state, the bus bar joint portion and the terminal joint portion are joined to each other, one of the plurality of bus bar fixing portions is a first fixing portion provided in the vicinity of the bus bar joint, and the remaining bus bar fixing portions are second fixing portions that are farther from the bus bar joint than the first fixing portion; The first fixed portion is provided with a circumferential positioning portion (121) that positions the power line bus bar in the circumferential direction, whereas the second fixed portion is not provided with the circumferential positioning portion.

[0008] In the busbar module, the power line busbar fixed to the busbar holder and the relay terminal are joined together, so that the stator winding is electrically connected to the power supply device side, such as an inverter. In detail, the arc-shaped power line busbar is fixed to the busbar holder by a plurality of busbar fixing parts spaced apart from each other in the circumferential direction, and the relay terminal is fixed to the busbar holder by a terminal fixing part. The busbar joint part of the power line busbar and the terminal joint part of the relay terminal are joined to each other by welding or the like.

[0009] In particular, in the power line busbar, one of the multiple busbar fixing portions is a first fixing portion provided near the busbar joint portion, which is the joint portion with the relay terminal, and the others are second fixing portions that are farther from the busbar joint portion than the first fixing portion. Then, the circumferential positioning portion positions the power line busbar only at the first fixing portion out of the first and second fixing portions. In this case, the first fixing portion suppresses circumferential positional deviation of the busbar joint portion, while the second fixing portion suppresses circumferential busbar position restriction. As a result, the power line busbar fixed to the busbar holder and the relay terminal can be properly joined.

[0010] In means 2, the busbar holder is provided with an insertion hole through which the first fixing portion and the second fixing portion are inserted in a pressed-in state, the first fixing portion is a press-fit fixing portion that is pressed circumferentially into the insertion hole, and the second fixing portion is a press-fit fixing portion that is pressed radially into the insertion hole.

[0011] In the power line busbar, a first fixing portion near the busbar joint is fixed in the insertion hole in a circumferentially pressed-in state, and a second fixing portion farther from the busbar joint than the first fixing portion is fixed in the insertion hole in a radially pressed-in state. This makes it possible to properly hold the power line busbar in the busbar holder while suppressing circumferential positional deviation at the first fixing portion and suppressing circumferential busbar position restriction at the second fixing portion.

[0012] In the third aspect, the press-fitting and holding force by the first fixing portion is greater than the press-fitting and holding force by the second fixing portion.

[0013] In the power line busbar, the press-fit holding force of the first fixing portion near the busbar joint is greater than the press-fit holding force of the second fixing portion not near the busbar joint, which makes it possible to preferentially suppress circumferential positional deviation at the first fixing portion in the power line busbar.

[0014] In means 4, the busbar joint portion and the terminal joint portion are joined in a radially abutting state, and the first fixing portion is provided with a protrusion portion that protrudes radially toward the opposite side of the relay terminal and abuts against the inner wall of the insertion hole.

[0015] In a configuration in which the busbar joint and the terminal joint are joined in a state of abutting each other in the radial direction, it is desirable to bring the busbar joint as close as possible to the terminal joint in the radial direction. In this case, if the radial dimension of the insertion hole of the busbar holder is larger than the radial dimension of the busbar fixing part, the power line busbar can be easily assembled to the busbar holder, but there is a concern that the busbar joint may unintentionally move away from the terminal joint in the radial direction. In consideration of this, in the power line busbar, a protrusion that protrudes radially to the opposite side of the relay terminal in the first fixing part near the busbar joint is provided, and the protrusion is configured to abut against the inner wall of the insertion hole. This makes it possible to prevent the busbar joint from unintentionally moving away from the terminal joint in the radial direction.

[0016] In means 5, the busbar holder is provided with a second insertion hole through which the terminal fixing portion of the relay terminal is inserted, and the terminal fixing portion is provided with a protrusion that protrudes radially toward the opposite side of the power line busbar and abuts against the inner wall of the second insertion hole.

[0017] The terminal fixing portion of the relay terminal is provided with a protrusion that protrudes radially to the opposite side of the power line busbar, and the protrusion is configured to abut against the inner wall of the second insertion hole. In this case, in combination with the configuration in which the first fixing portion of the power line busbar is provided with a protrusion that protrudes radially to the opposite side of the relay terminal, the busbar joint and the terminal joint can be brought closer to each other in the radial direction, and the busbar joint and the terminal joint can be joined more appropriately.

[0018] In means 6, the power line bus bar has a main body portion extending circumferentially and an arm portion extending radially from the main body portion, and the bus bar holder is formed with a plurality of through holes that penetrate axially at a position radially outward from the power line bus bar and through which conductor ends extending axially from the phase winding of each phase are inserted, and the arm portions are joined to the conductor ends inserted into the through holes, and at least the second fixed portion of the first fixed portion and the second fixed portion is provided with a protrusion that protrudes radially outward and abuts the inner wall of the insertion hole.

[0019] In a busbar holder that holds a power line busbar, when the conductor end of a phase winding is inserted into a through hole located radially outward from the power line busbar and the arm portion of the power line busbar is joined to the conductor end, there is a concern that the tip of the arm portion may protrude excessively radially outward and come into unintentional contact with a housing, etc. In consideration of this point, at least the second fixing portion of the first and second fixing portions of the power line busbar is provided with a protrusion that protrudes radially outward, and the protrusion is configured to abut against the inner wall of the insertion hole. This makes it possible to prevent the tip of the arm portion from protruding excessively radially outward.

[0020] In Means 7, the phase windings of each phase in the stator winding are connected at a neutral point, the busbar holder holds the power line busbars of each phase, and holds a neutral point busbar for neutral point connection radially outward from the power line busbars, the neutral point busbar has a main body portion extending in a circumferential direction and an arm portion extending radially from the main body portion, and has a plurality of busbar fixing portions fixed to the busbar holder at a plurality of locations on the main body portion spaced apart from each other in the circumferential direction, the busbar holder has a plurality of through holes formed at positions radially outward from the neutral point busbar, which penetrate the axial direction and allow the insertion of conductor ends extending in the axial direction from the phase windings of each phase, the arm portions of the neutral point busbar are joined to the conductor ends inserted into the through holes, and the busbar fixing portion of the neutral point busbar is provided with a protrusion protruding radially outward and abutting the inner wall of the insertion hole.

[0021] In a busbar holder in which a neutral busbar is disposed radially outward from a power line busbar, when the conductor end of a phase winding is inserted into a through hole located radially outward from the neutral busbar and the arm portion of the neutral busbar is joined to the conductor end, there is a concern that the tip of the arm portion may excessively protrude radially outward and unintentionally contact a housing or the like. In particular, when the neutral busbar is disposed radially near the outer periphery of the busbar holder, the length of the arm portion becomes short, and depending on the bending shape, there is a greater concern that the radial tip side of the arm portion may protrude. In consideration of this point, a protrusion that protrudes radially outward is provided on the busbar fixing portion of the neutral busbar, and the protrusion is configured to abut against the inner wall of the insertion hole. This makes it possible to suppress the inconvenience of the tip of the arm portion of the neutral busbar protruding excessively radially outward. [Brief description of the drawings]

[0022] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a diagram showing the electrical configuration of a control device. [Figure 4]FIG. [Diagram 5] FIG. 4 is a perspective view illustrating a configuration of a stator core. [Figure 6] FIG. 3 is a diagram showing the winding configuration of the stator winding. [Figure 7] FIG. 4 is a diagram showing the correspondence between each partial winding of a stator winding and a tooth number. [Figure 8] FIG. 4 is a perspective view showing an example of a winding structure of partial windings around a group of teeth. [Figure 9] FIG. 4 is a perspective view showing a state in which a stator winding is wound around a stator core. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 4 is a perspective view showing a state in which the power bus bar and the neutral bus bar are separated. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] 3A and 3B are a perspective view and a plan view of a bus bar holder. [Figure 18] FIG. 4 is a front view showing a state in which the busbar module is assembled to the stator. [Figure 19] FIG. 4 is a diagram showing a state in which a circuit board is assembled to a relay terminal. [Figure 20] 4 is an enlarged view of a first fixing portion of the power line bus bar. FIG. [Figure 21] 4 is an enlarged view of a second fixing portion of the power line bus bar. FIG. [Figure 22] FIG. 4 is a perspective view showing a terminal joint portion of the power line bus bar and the relay terminal. [Figure 23] FIG. 4 is a plan view showing a terminal joint portion of the power line bus bar and the relay terminal. [Figure 24] Cross-sectional view taken along line 24-24 in Figure 23. [Diagram 25]FIG. 4 is a plan view of the neutral bus bar as viewed from the press-fitted fixed portion side. [Figure 26] FIG. 4 is an enlarged perspective view showing the configuration of a joint portion between each bus bar and an end portion of a conductor wire. [Figure 27] 4 is an enlarged plan view showing the configuration of a joint portion between each bus bar and an end portion of a conductor; FIG. [Figure 28] 13 is a diagram showing a state in which the end of a conductor is inserted into a through hole of a busbar holder. FIG. [Figure 29] 13 is a diagram showing a state in which the end of a conductor is inserted into a through hole of a busbar holder. FIG. [Diagram 30] 13 is a diagram showing a cross-sectional structure of a terminal joint portion of a power line bus bar and a relay terminal in a modified example. FIG. [Diagram 31] FIG. 11 is a plan view of a bus bar module according to another embodiment. [Diagram 32] FIG. 11 is a plan view showing a configuration of a circuit board in a further example. [Diagram 33] FIG. 11 is a winding configuration diagram of a stator winding in another example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, a rotating electric machine according to an embodiment will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings, and the description of the same parts is incorporated herein by reference. In this embodiment, a motor 10 is used as an example of a rotating electric machine.

[0024] The motor 10 shown in Fig. 1 is a permanent magnet field type motor, specifically a permanent magnet field type synchronous machine having a three-phase winding. The three-phase winding is preferably provided in two systems. The motor 10 includes a housing 20, a stator 30 fixed to the housing 20, a rotor 40 that rotates relative to the stator 30, and a rotating shaft 11 to which the rotor 40 is fixed. In the following description, the axial direction refers to the direction in which the rotating shaft 11 extends, the radial direction refers to the direction extending radially from the center of the rotating shaft 11, and the circumferential direction refers to the circumferential direction centered on the rotating shaft 11.

[0025] The housing 20 is formed in a cylindrical shape, and the stator 30, the rotor 40, and the like are accommodated in the housing 20. The housing 20 has a cylindrical housing body 21 with a bottom and an end plate portion 23 fixed to an open end of the housing body 21. The housing body 21 and the end plate portion 23 are formed of a metal material such as aluminum. The housing body 21 has a bottom portion 22 at an axial end. At the radial center between the bottom portion 22 and the end plate portion 23 of the housing body 21, cylindrical boss portions 22a, 23a are formed extending toward the inside of the housing in the axial direction, and bearings 25, 26 are attached to the boss portions 22a, 23a. The rotating shaft 11 is rotatably supported by the bearings 25, 26. The boss portions 22a, 23a are bearing fixing portions for fixing the bearings 25, 26. The boss portion 23a in the end plate portion 23 is surrounded by a circular hollow portion 24. An angle sensor 12 is provided on the tip side of the rotating shaft 11. The angle sensor 12 may be a magnetic sensor or a resolver.

[0026] A control device 50 for controlling the energization of the motor 10 and a cover 27 for covering the control device 50 are provided on one axial end side of the housing 20.

[0027] The stator 30 is fixed to the inner peripheral surface of the housing 20, centered around the axis of the rotating shaft 11. The stator 30 constitutes a magnetic circuit together with the rotor 40. The stator 30 has an annular stator core 31 arranged radially opposite to the outer periphery of the rotor 40, and a stator winding 32 wound around the stator core 31.

[0028] As shown in FIG. 2, the stator core 31 has an annular back yoke 33 and a plurality of teeth 34 that protrude radially inward from the back yoke 33 and are arranged at a predetermined distance in the circumferential direction, and a slot 35 is formed between adjacent teeth 34. In the stator core 31, the teeth 34 are provided at equal intervals in the circumferential direction, and the stator winding 32 is wound around the teeth 34 by concentrated winding. As a result, the conductor of the stator winding 32 is accommodated in each slot 35. In this embodiment, the number of teeth 34 and the number of slots 35 are each set to "18". For convenience of explanation, the teeth 34 are assigned the symbols T1 to T18 in the counterclockwise order in the circumferential arrangement, and when it is necessary to indicate the teeth number, the teeth 34 are also described as teeth T1, T2, T3, . . . The stator winding 32 is held in a state of being accommodated in the slot 35, and generates a magnetic flux when power (AC power) is supplied.

[0029] The stator core 31 is formed by stacking a plurality of thin steel plates (core sheets) that are magnetic bodies in the axial direction of the stator core 31. The steel plates may be formed, for example, by press-punching a strip-shaped electromagnetic steel plate material.

[0030] The rotor 40 constitutes a part of the magnetic circuit, has a plurality of magnetic poles in the circumferential direction, and is disposed so as to face the stator 30 in the radial direction. In this embodiment, the rotor 40 has 14 magnetic poles (i.e., the number of magnetic pole pairs is 7). The rotor 40 includes a rotor core 41 made of a magnetic material, and a permanent magnet 42 fixed to the rotor core 41. Specifically, as shown in FIG. 2, the rotor 40 includes 14 permanent magnets 42 as a magnet portion so that the polarities are alternated in the circumferential direction, and the permanent magnets 42 are embedded in receiving holes provided in the rotor core 41 along the axial direction.

[0031] The rotor 40 may have a known configuration, and may be, for example, an IPM (Interior Permanent Magnet) type rotor or an SPM (Surface Permanent Magnet) type rotor. A rotor on the field winding side may also be used as the rotor 40. In this embodiment, an IPM type rotor is used. The rotating shaft 11 is inserted into the rotor 40, and the rotor 40 is fixed to the rotating shaft 11 so as to rotate integrally with the rotating shaft 11 around the rotating shaft 11.

[0032] As shown in FIG. 1, the motor 10 is an electromechanical integrated motor, and a control device 50 is provided on the side of the stator 30 and the rotor 40 in the axial direction. The control device 50 is accommodated in a cover 27 that is integrally provided on the housing 20. As shown in FIG. 3, the control device 50 includes inverters 51, 52 and a control unit 53 that controls the current supply to the inverters 51, 52. The control unit 53 is mainly configured with a microcomputer including a CPU, a ROM, a RAM, an I / O, etc., and realizes various functions by the CPU executing a program stored in the ROM. Note that the various functions may be realized by electronic circuits, which are hardware, or at least a part of them may be realized by software, i.e., by processing executed on a computer.

[0033] The control unit 53 has a function of controlling the motor 10 (such as current control) based on commands from a higher-level ECU (not shown) and information related to the rotation angle input from the angle sensor 12. The inverters 51 and 52 convert power from an external source (such as a battery) and supply it to the motor 10 to generate driving force.

[0034] The control device 50 has a circuit board 55 and various electric components 56 mounted on the circuit board 55. The electric components 56 include a microcomputer constituting the control unit 53, and semiconductor switching elements and drive circuits constituting the inverters 51 and 52. The control device 50 is provided on the opposite side of the end plate portion 23 from the stator 30.

[0035] FIG. 3 is a diagram showing the electrical configuration of the control device 50 in this embodiment.

[0036] In this embodiment, the stator winding 32 has two systems of three-phase windings. That is, the stator winding 32 is composed of a first stator winding 32a and a second stator winding 32b. Inverters 51 and 52 are provided for the stator windings 32a and 32b, respectively. Here, the inverter 51 connected to the first stator winding 32a is also referred to as the first inverter 51, and the inverter 52 connected to the second stator winding 32b is also referred to as the second inverter 52. Each of the inverters 51 and 52 is formed of a full bridge circuit having upper and lower arms in the same number as the number of phases of the three phases. The control unit 53 controls the current in each phase by turning on and off switching elements provided in each arm of the inverters 51 and 52.

[0037] More specifically, the first inverter 51 includes a series connection of upper arm switches Sp and lower arm switches Sn as switching elements in three phases consisting of U phase, V phase, and W phase. In this embodiment, a voltage-controlled semiconductor switching element, specifically an IGBT, is used as the upper arm switch Sp and the lower arm switch Sn in each phase. Note that a MOSFET may also be used as the switching element. Freewheel diodes (freewheel diodes) Dp, Dn are connected in inverse parallel to the upper arm switch Sp and the lower arm switch Sn in each phase.

[0038] The high potential terminal (collector) of the upper arm switch Sp of each phase is connected to the positive terminal of the battery B. The low potential terminal (emitter) of the lower arm switch Sn of each phase is connected to the negative terminal (ground) of the battery B. An intermediate connection point between the upper arm switch Sp and the lower arm switch Sn of each phase is connected to one end of the phase winding of each phase in the first stator winding 32a. The first stator winding 32a has phase windings of U-phase, V-phase, and W-phase, and in the first inverter 51, one end of the phase winding of each phase is connected to the intermediate connection point of the upper and lower arm switches Sp, Sn.

[0039] The second inverter 52 has a similar configuration to the first inverter 51, and therefore a detailed description thereof will be omitted here. The second stator winding 32b has X-phase, Y-phase, and Z-phase windings, and in the second inverter 52, one end of each of these phase windings is connected to the intermediate connection points of the upper and lower arm switches Sp, Sn, respectively. The three-phase currents supplied from the first inverter 51 and the three-phase currents supplied from the second inverter 52 have a predetermined current phase difference from each other.

[0040] As described above, the motor 10 of this embodiment is a two-system, 14-pole, 18-slot concentrated winding motor.

[0041] The following describes a specific configuration of the stator 30. Fig. 4 is a plan view of the stator 30, and Figs. 5(a) and 5(b) are perspective views for explaining the configuration of the stator core 31.

[0042] In the stator 30, the stator core 31 is composed of a plurality of split cores 61, and the split cores 61 are arranged in a line in the circumferential direction to form the stator core 31 into a cylindrical shape. Each split core 61 has a core body 62 which is a laminated steel plate body, and insulating members 63, 64 which are made of an insulating resin material or the like. Fig. 5(a) shows the stator core 31 with the insulating members 63, 64 attached, and Fig. 5(b) shows the stator core 31 with the insulating members 63, 64 removed.

[0043] The core body 62 has teeth 34 extending in the radial direction of the stator core 31, a yoke portion 62a provided on one end side thereof, and a flange portion 62b provided on the other end side thereof. The yoke portion 62a is a portion corresponding to the back yoke 33 of the stator core 31 shown in FIG. 2. The yoke portions 62a of adjacent split cores 61 may be joined to each other by adhesive or the like. The insulating members 63, 64 are attached to one end side and the other end side of the teeth 34 in the axial direction. The insulating members 63, 64 have upright portions 63a, 64a extending in the axial direction radially outside (the back yoke 33 side) of the teeth 34. The upright portions 63a, 64a are provided with groove portions 63b, 64b at two circumferential positions, respectively, through which the conductor material of the stator winding 32 can be inserted.

[0044] The split cores 61 are lined up in the circumferential direction, so that the teeth 34 and the slots 35 are arranged alternately in the circumferential direction, as shown in Fig. 2. In this embodiment, the stator core 31 is made up of 18 split cores 61. As shown in Fig. 4, the stator winding 32 is formed by winding conductive wire around each tooth 34 using concentrated winding. However, Fig. 4 shows only one example of the winding structure for each tooth 34, and does not necessarily match the winding structure described below. The winding structure in this embodiment will be described in detail later.

[0045] An example of the electrical configuration of the stator winding 32 is shown in Fig. 6. Fig. 6(a) shows the configuration of U-, V-, and W-phase windings in the first stator winding 32a, and Fig. 6(b) shows the configuration of X-, Y-, and Z-phase windings in the second stator winding 32b. In each of these stator windings 32a, 32b, the phase windings of each phase are connected to each other by a star connection (Y connection).

[0046] 6(a), the first stator winding 32a has partial windings U1, U2, U3, and U4 as a U-phase phase winding, partial windings V1, V2, V3, and V4 as a V-phase phase winding, and partial windings W1, W2, W3, and W4 as a W-phase phase winding. One end of the series-connected body of the partial windings U1 and U2, one end of the series-connected body of the partial windings V1 and V2, and one end of the series-connected body of the partial windings W1 and W2 are connected to each other at a neutral point N1a, and one end of the series-connected body of the partial windings U3 and U4, one end of the series-connected body of the partial windings V3 and V4, and one end of the series-connected body of the partial windings W3 and W4 are connected to each other at a neutral point N1b.

[0047] 6(b), the second stator winding 32b has partial windings X1, X2, X3, and X4 as an X-phase phase winding, partial windings Y1, Y2, Y3, and Y4 as a Y-phase phase winding, and partial windings Z1, Z2, Z3, and Z4 as a Z-phase phase winding. One end of the series-connected body of the partial windings X1 and X2, one end of the series-connected body of the partial windings Y1 and Y2, and one end of the series-connected body of the partial windings Z1 and Z2 are connected to each other at a neutral point N2a, and one end of the series-connected body of the partial windings X3 and X4, one end of the series-connected body of the partial windings Y3 and Y4, and one end of the series-connected body of the partial windings Z3 and Z4 are connected to each other at a neutral point N2b.

[0048] The partial windings U1 to U4, V1 to V4, W1 to W4 of each phase in the first stator winding 32a and the partial windings X1 to X4, Y1 to Y4, Z1 to Z4 of each phase in the second stator winding 32b are wound by concentrated winding around the teeth 34 of the stator core 31. In this embodiment, the 12 partial windings of the first stator winding 32a and the 12 partial windings of the second stator winding 32b are distributed and wound around the 18 teeth 34 of the stator core 31. This point will be described in detail below.

[0049] In the stator core 31, a total of 18 teeth 34 are divided into three teeth groups, and partial windings of two phase windings of different phases are wound around three teeth 34 in each teeth group. That is, in the stator 30, as shown in Fig. 4, all teeth 34 (T1 to T18) of the stator core 31 are divided into six teeth groups G1 to G6, and the stator windings 32a and 32b are configured by winding phase windings of each phase around the teeth groups G1 to G6 arranged in the circumferential direction. Two partial windings out of the partial windings U1 to U4, V1 to V4, and W1 to W4 of the first stator winding 32a and two partial windings out of the partial windings X1 to X4, Y1 to Y4, and Z1 to Z4 of the second stator winding 32b are wound around each of the teeth groups G1 to G6 in an assigned state. In this case, in each of the teeth groups G1 to G6, a partial winding of the first stator winding 32a is wound around one of the three teeth on both sides in the circumferential direction of each of the teeth 34, and a partial winding of the second stator winding 32b is wound around the other of each of the teeth 34. In addition, the partial windings of both the first and second stator windings 32a, 32b are wound around the central tooth 34 of each of the teeth groups G1 to G6.

[0050] In each of teeth groups G1 to G6, if the three consecutive teeth 34 arranged in the circumferential direction are arranged in circumferential order as the first teeth, second teeth, and third teeth, a partial winding of the first phase winding of the multiple phase windings is wound continuously around the first and second teeth, and a partial winding of the second phase winding of the multiple phase windings is wound continuously around the second and third teeth. The second tooth, which is the center of the three consecutive teeth 34, is a common tooth around which both the first and second phase windings are wound.

[0051] 7 is a diagram showing the relationship between each of the partial windings of the stator windings 32a and 32b and each of the teeth T1 to T18. In FIG. 7, for example, in the teeth group G1, A partial winding W1 of the first stator winding 32a is wound around the teeth T1, The partial winding W2 of the first stator winding 32a and the partial winding X2 of the second stator winding 32b are wound around the teeth T2, The partial winding X1 of the second stator winding 32b is wound around tooth T3. These teeth T1 to T3 correspond to the first to third teeth. Although a description of the other tooth groups G2 to G6 is omitted, the partial windings are wound in a similar manner, and the three teeth in each of the tooth groups G2 to G6 correspond to the first to third teeth, respectively.

[0052] Each of the teeth groups G1 to G6 shown in Fig. 7 includes three pairs of teeth groups, each of which has the same combination of phase windings for two phases. Specifically, in the teeth groups G1 and G4, a W-phase winding and an X-phase winding are combined as a combination of phase windings for two phases. In the teeth groups G2 and G5, a V-phase winding and a Z-phase winding are combined as a combination of phase windings for two phases, and in the teeth groups G3 and G6, a U-phase winding and a Y-phase winding are combined as a combination of phase windings for two phases.

[0053] Teeth groups that have the same combination of phase windings for two phases, i.e., teeth groups G1 and G4, teeth groups G2 and G5, and teeth groups G3 and G6, are each arranged at positions 180 degrees apart from each other in the circumferential direction (see FIG. 4).

[0054] Next, the winding structure of the phase windings (partial windings) in each of the teeth groups G1 to G6 will be described.

[0055] FIG. 8 is a perspective view showing an example of a winding structure of partial windings for one tooth group G. FIG. 8 illustrates the winding structure of tooth group G1 including teeth T1 to T3. In tooth group G1, partial windings W1 and W2 are wound around teeth T1 and T2 using conductor material C1 as a W-phase winding, and partial windings X1 and X2 are wound around teeth T2 and T3 using conductor material C2 as an X-phase winding. Of the W-phase winding and the X-phase winding, the X-phase winding is a first-wound phase winding that is wound first during winding, and the W-phase winding is a last-wound phase winding that is wound last. Each of the conductor materials C1 and C2 is a coated conductor in which a conductor is covered with an insulating coating, and is, for example, a round wire.

[0056] When winding the X-phase winding, which is the pre-wound winding, the conductor wire C2 is wound around the teeth group G1 in the order of teeth T3 → teeth T2. At this time, the conductor wire C2 is wound around the teeth T3, T2 in the opposite circumferential directions. In the conductor wire C2, the winding start side conductor end and the winding end side conductor end are drawn-out portions H21, H22 drawn out in the axial direction. In addition, in the conductor wire C2, the crossover portion H23 between both partial windings X1, X2 may be guided by the insulating member 63 provided on each divided core 61. Specifically, the crossover portion H23 may be guided to the outside of the standing portion 63a, i.e., the opposite side of the teeth across the standing portion 63a, via the groove portion 63b of the insulating member 63. The transition portion H23 is guided to the outside of the standing portion 63a, so that the transition portion H23 of the conductor C2 does not interfere with the winding of the conductor C1 which is wound later.

[0057] When winding the W-phase winding, which is a post-wound winding, the conductor wire C1 is wound around the teeth group G1 in the order of teeth T1 and then teeth T2. At this time, the conductor wire C1 is wound around the teeth T1 and T2 in opposite circumferential directions. In the conductor wire C1, the winding start side and the winding end side are drawn-out portions H11 and H12 drawn out in the axial direction. In the conductor wire C1, the crossover portion H13 between the two partial windings W1 and W2 does not have to be guided by the insulating member 63, unlike the crossover portion H23. This is because the W-phase winding is a post-wound winding.

[0058] Fig. 9 is a perspective view showing a state in which the stator winding 32 is wound around the stator core 31. In Fig. 9, the conductor end portion 36 is extended in the axial direction for each partial winding wound around each tooth 34. The conductor end portion 36 corresponds to the lead-out portions H11, H12, H21, and H22 described in Fig. 8. In this embodiment, four conductor end portions 36 are provided for each tooth group G, and a total of 24 conductor end portions 36 are provided for all six tooth groups G.

[0059] <Explanation of busbar module 70> A busbar module 70 is attached to one axial end of the stator 30, and the configuration of the busbar module 70 will be described below. Fig. 10 is a perspective view of the busbar module 70, and Fig. 11 is a plan view of the busbar module 70. Note that Fig. 11 shows the correspondence with the teeth groups G1 to G6 described above.

[0060] The busbar module 70 has a plurality of power line busbars 71 provided for each phase, a plurality of neutral point busbars 72, a relay terminal 73 connected to the power line busbars 71 of each phase, and a busbar holder 74 that holds the busbars 71, 72 and the relay terminal 73. The power line busbars 71 and the neutral point busbar 72 are made of metal plates, the plate surface direction extends in the axial direction, and have an arc shape in a plan view. The power line busbar 71 is a conductive member that connects partial windings of the same phase to each other, and the neutral point busbar 72 is a conductive member that connects the partial windings of each phase by star connection.

[0061] The power line bus bar 71 is made up of bus bars for six phases in each of the stator windings 32a and 32b. That is, as shown in Fig. 11, the power line bus bar 71 includes a U-phase bus bar 71U, a V-phase bus bar 71V, and a W-phase bus bar 71W, which are bus bars for each phase of the first stator winding 32a, and an X-phase bus bar 71X, a Y-phase bus bar 71Y, and a Z-phase bus bar 71Z, which are bus bars for each phase of the second stator winding 32b. Each power line bus bar 71 electrically connects partial windings of the same phase to each other.

[0062] The neutral point bus bar 72 includes neutral point bus bars 72A, 72B corresponding to neutral points N1a, N1b of the first stator winding 32a shown in Figure 6(a), and neutral point bus bars 72C, 72D corresponding to neutral points N2a, N2b of the second stator winding 32b shown in Figure 6(b).

[0063] The relay terminals 73 include a U-phase terminal 73U, a V-phase terminal 73V, and a W-phase terminal 73W which are relay terminals 73 for each phase of the first stator winding 32a, and an X-phase terminal 73X, a Y-phase terminal 73Y, and a Z-phase terminal 73Z which are relay terminals 73 for each phase of the second stator winding 32b. In each phase, the relay terminals 73 of each phase are joined to a power line bus bar 71, and the power line bus bar 71 and the relay terminals 73 can be electrically connected to each other. The relay terminals 73 are conductive members which relay between the stator windings 32a, 32b and the inverters 51, 52 of the control device 50.

[0064] The busbar holder 74 is provided with a plurality of busbar accommodating grooves 111 extending in the circumferential direction and aligned in the radial direction. The busbar holder 74 is provided with five rows of busbar accommodating grooves 111 in the radial direction, and the spaces between the busbar accommodating grooves 111 in the radial direction form isolation walls that insulate and isolate the busbars aligned in the radial direction. In this embodiment, of the five rows of busbar accommodating grooves 111 in the radial direction, the power line busbars 71 of each phase are accommodated in the three rows of busbar accommodating grooves 111 on the radially inner side, and the neutral point busbar 72 is accommodated in the two rows of busbar accommodating grooves 111 on the radially outer side. The busbar holder 74 is also provided with two busbar accommodating grooves 111 aligned in the circumferential direction at positions that are the same diameter. In other words, the busbar holder 74 has six busbar accommodating grooves 111, two in each row, for the power line busbars 71, and four busbar accommodating grooves 111, two in each row, for the neutral point busbars 72.

[0065] The configuration of each part of the busbar module 70 will be specifically described below. First, the power line busbar 71 and the neutral point busbar 72 will be described. Fig. 12 is a perspective view showing the power line busbar 71 and the neutral point busbar 72 separated into (a) to (d). Fig. 13 is a perspective view showing the configuration of one power line busbar 71 (specifically, the X-phase busbar 71X) among the multiple power line busbars 71, and Fig. 14 is a perspective view showing the configuration of one neutral point busbar 72 (specifically, the neutral point busbar 72C) among the multiple neutral point busbars 72.

[0066] In FIG. (a) shows a V-phase bus bar 71V and a Z-phase bus bar 71Z, (b) shows a U-phase bus bar 71U and a Y-phase bus bar 71Y, (c) shows a W-phase bus bar 71W and an X-phase bus bar 71X, In (d), four neutral bus bars 72A to 72D are shown. 12(a) to (c), two power line bus bars 71 each having a substantially semicircular shape are arranged side by side in the circumferential direction. Bus bars 71V and 71Z in (a), bus bars 71U and 71Y in (b), and bus bars 71W and 71X in (c) have different radii of curvature, with bus bars 71V and 71Z having the smallest radius of curvature and bus bars 71W and 71X having the largest radius of curvature. In (d), neutral point bus bars 72A to 72D are divided into two groups in the circumferential direction and arranged in double radial positions.

[0067] Busbars 71V and 71Z in (a) are busbars connected to the V-phase winding and Z-phase winding of tooth groups G2 and G5. Busbars 71U and 71Y in (b) are busbars connected to the U-phase winding and Y-phase winding of tooth groups G3 and G6. Busbars 71W and 71X in (c) are busbars connected to the W-phase winding and X-phase winding of tooth groups G1 and G4.

[0068] As shown in FIG. 13, the power line busbar 71 has a main body portion 81 extending in an arc shape, a plurality of press-fitted fixing portions 82 extending axially from the main body portion 81 and press-fitted and fixed to the busbar holder 74, and a plurality of arm portions 83 extending radially outward from the main body portion 81. The press-fitted fixing portions 82 are provided at three locations spaced apart from one another in the circumferential direction. The press-fitted fixing portions 82 are preferably provided at equal intervals in the circumferential direction. However, the press-fitted fixing portions 82 may be provided at unequal intervals in the circumferential direction. The arm portions 83 are provided at both ends of the main body portion 81 at positions shifted in the axial direction (in other words, in the plate surface direction) relative to the main body portion 81. At the tip of each arm portion 83, a folded portion 83a is formed by folding back in a substantially U-shape in the radial direction. In this embodiment, at the tip of the arm portion 83, a portion that is folded back and extends from the radially outer side (the arm tip side) toward the radially inner side serves as a folded back portion 83a.

[0069] Furthermore, power line busbar 71 has an upright portion 84 extending axially from main body portion 81, and a joint terminal portion 85 is provided at the tip of upright portion 84 as a portion to be joined to relay terminal 73 shown in FIG. 10 etc. In power line busbar 71, press-fit fixing portion 82 and upright portion 84 are provided so as to protrude in opposite directions to each other in the axial direction. In power line busbar 71, press-fit fixing portion 82 corresponds to the "busbar fixing portion," and joint terminal portion 85 corresponds to the "busbar joint portion."

[0070] 12, the power line busbars 71 of each phase have a common configuration in that they all have a main body portion 81, a plurality of press-fit fixing portions 82, a plurality of arm portions 83, an upright portion 84, and a connecting terminal portion 85. However, the positions of the press-fit fixing portions 82 and the connecting terminal portions 85 in the longitudinal direction of the main body portion 81 are different for each power line busbar 71 of each phase. Also, the length and shape of the arm portions 83 are different for each power line busbar 71 depending on the radial arrangement position and the position of the conductor end portion 36 of the partial winding to be connected.

[0071] 14, the neutral point bus bar 72 has a main body portion 91 extending in an arc shape, a plurality of press-fit fixing portions 92 extending axially from the main body portion 91 and press-fitted and fixed to the bus bar holder 74, and a plurality of arm portions 93 extending radially outward from the main body portion 91. The press-fit fixing portions 92 are provided at three locations spaced apart from each other in the circumferential direction. The arm portions 93 are provided at three locations including both ends of the main body portion 91, at positions shifted in the axial direction (in other words, in the plate surface direction) with respect to the main body portion 91. The tip of each arm portion 93 is provided with a folded portion 93a folded back in a substantially U-shape in the radial direction.

[0072] The power line bus bar 71 and the neutral point bus bar 72 may be formed into the illustrated shape by punching and bending a flat plate material.

[0073] Next, the configuration of the relay terminal 73 will be described. Fig. 15 is a perspective view of the relay terminal 73 of each phase, with Fig. 15(a) showing a U-phase terminal 73U, a V-phase terminal 73V, and a W-phase terminal 73W which are relay terminals 73 of the UVW phases, and Fig. 15(b) showing an X-phase terminal 73X, a Y-phase terminal 73Y, and a Z-phase terminal 73Z which are relay terminals 73 of the XYZ phases. Fig. 16 is a perspective view showing one relay terminal 73 (Z-phase terminal 73Z).

[0074] As shown in FIG. 16, the relay terminal 73 has a connection end 101 provided at one end in the longitudinal direction, a press-fit fixing portion 102 provided at the other end in the longitudinal direction, a bent portion 103 provided in an intermediate portion between the connection end 101 and the press-fit fixing portion 102, and a joint terminal portion 104 provided between the bent portion 103 and the press-fit fixing portion 102. The connection end 101 is a portion connected to the circuit board 55, and the press-fit fixing portion 102 is a portion that is press-fitted and fixed to the busbar holder 74. The joint terminal portion 104 is a portion that is joined to the joint terminal portion 85 of the power line busbar 71 by welding or the like. In the relay terminal 73, the press-fit fixing portion 102 corresponds to the "terminal fixing portion", and the joint terminal portion 104 corresponds to the "terminal joint portion".

[0075] The relay terminal 73 is provided with a contact portion 105 between the bent portion 103 and the press-fitted fixing portion 102, which extends in a direction perpendicular to the axial direction and contacts an axial end face (the seat portion 116 in FIG. 17) of the busbar holder 74. A joint terminal portion 104 is provided at a tip position extending radially from the contact portion 105.

[0076] 15(a) and 15(b), the relay terminals 73 of each phase have a common configuration in that they all have a connection end 101, a press-fit fixing portion 102, a bent portion 103, a joining terminal portion 104, and a contact portion 105. However, the shape of the bent portion 103 is different in the relay terminals 73 of each phase. Also, the relay terminals 73 of each phase include those in which the press-fit fixing portion 102 is oriented in a different direction and those in which the contact portion 105 extends in a different direction.

[0077] The relay terminal 73 may be formed by punching a flat plate material and then bending the bent portion 103, the joint terminal portion 104, and the contact portion 105. The bent portion 103 may be formed by punching.

[0078] Next, the configuration of the busbar holder 74 will be described with reference to Fig. 17. Fig. 17(a) is a perspective view of the busbar holder 74, and Fig. 17(b) is a plan view of the busbar holder 74. Note that Fig. 15(b) shows the correspondence with each of the tooth groups G1 to G6 to ensure consistency with Fig. 11 and the like.

[0079] The busbar holder 74 is made of, for example, an insulating resin material and is formed in a circular ring shape. The busbar holder 74 is provided with a plurality of busbar accommodating grooves 111 for accommodating the power line busbar 71 and the neutral point busbar 72. The busbar accommodating grooves 111 are opened on one of the axial sides of the busbar holder 74, i.e., on the side opposite to the stator, and are each formed in an arc shape with a length of approximately a semicircle. The busbar accommodating grooves 111 in each row arranged in the radial direction have different radii of curvature of the arc. The busbar accommodating grooves 111 are provided in five rows arranged in the radial direction. In this embodiment, of the five rows of busbar accommodating grooves 111 arranged in the radial direction, three rows on the radially inner side are busbar accommodating grooves 111 for power line busbars, and two rows on the radially outer side are busbar accommodating grooves 111 for neutral point busbars. In each bus bar accommodating groove 111, a power line bus bar 71 and a neutral point bus bar 72 are assembled such that the bus bar plate surfaces face each other in the radial direction.

[0080] The busbar accommodating grooves 111 are provided with insertion holes 112 through which the press-fitted fixing portions 82 of the power line busbar 71 and the press-fitted fixing portions 92 of the neutral point busbar 72 are inserted. The insertion holes 112 are provided so as to penetrate in the axial direction from the bottom surface of the busbar accommodating grooves 111. Each busbar accommodating groove 111 is provided with the same number of insertion holes 112 as the press-fitted fixing portions 82, 92 of each busbar 71, 72 (i.e., three).

[0081] A plurality of through holes 113 penetrating in the axial direction (thickness direction of the busbar holder 74) are provided at the outer edge portion of the busbar holder 74, i.e., radially outside each busbar accommodating groove 111. These through holes 113 are conductor passing holes through which the lead-out portions drawn out in the axial direction from the partial windings of each phase, i.e., the conductor end portions 36 shown in FIG. 9 are inserted. The number of through holes 113 is the same as the number of partial windings of the stator winding 32, and in this embodiment, 24 through holes 113 are provided in the circumferential direction. The through holes 113 are conductor guide portions that guide the conductor end portions 36 of the partial windings to connection positions with each busbar 71, 72 in the busbar module 70.

[0082] The busbar holder 74 is provided with a plurality of arm support parts 114 that support the arm parts 83 of the power line busbar 71. Each arm support part 114 is provided as a protrusion extending in the axial direction in the busbar holder 74, and is disposed in a distributed manner in the circumferential direction according to the position of the arm parts 83 of the power line busbar 71. The power line busbar 71 is provided at a position radially inward of the neutral point busbar 72, and the length of the arm parts 83 is relatively long, but the middle part of the arm parts 83 is supported by the arm support parts 114, so that the circumferential position of the arm parts 83 is maintained at an appropriate position.

[0083] The arm support portion 114 is provided radially outward of the busbar accommodating grooves 111 for power busbars provided in the three radially inner rows of the five radially aligned busbar accommodating grooves 111, so as to be able to support the arm portions 83 for six phases. In this embodiment, the arm support portion 114 for supporting the arm portions 83 for six phases is provided at a position between the two radially outer rows of busbar accommodating grooves 111 for neutral point busbars, arranged in the circumferential direction. The arm support portion 114 can also be provided between the three radially inner rows of busbar accommodating grooves 111 for power busbars and the two radially outer rows of busbar accommodating grooves 111 for neutral point busbars.

[0084] Note that the power line bus bar 71 includes arm portions 83 that cross each other, and arm support portions 114 are provided at the arm portions 83 to prevent contact with each other at the crossing portions. In Fig. 17, for the purpose of distinction, the arm support portions 114 provided at the crossing portions of the arm support portions 114 are referred to as "arm support portions 114X."

[0085] The busbar holder 74 is provided with terminal support portions 115 for supporting the relay terminals 73 of each phase. The terminal support portions 115 are provided at two locations spaced approximately 180° apart in the circumferential direction, one of which serves as a first support portion 115A supporting the relay terminals 73 of each phase of the first stator winding 32a, i.e., a U-phase terminal 73U, a V-phase terminal 73V, and a W-phase terminal 73W, and the other of which serves as a second support portion 115B supporting the relay terminals 73 of each phase of the second stator winding 32b, i.e., an X-phase terminal 73X, a Y-phase terminal 73Y, and a Z-phase terminal 73Z.

[0086] The first support portion 115A is provided with a base portion 116 against which the abutment portions 105 of the UVW phase relay terminals 73 (73U, 73V, 73W) abut, and an insertion hole 117 through which the press-fit fixing portions 102 of each relay terminal 73 are inserted. The base portion 116 is provided to stand up from the axial end face of the busbar holder 74, and its upper surface serves as the mounting surface for each relay terminal 73 (73U, 73V, 73W), in other words, the abutted surface against which the abutment portions 105 of each relay terminal 73 abut. The insertion hole 117 is provided near the base portion 116 so as to penetrate the busbar holder 74 in the axial direction. In the busbar holder 74, the insertion hole 117 corresponds to the "second insertion hole."

[0087] The second support portion 115B has a similar configuration and is provided with a base portion 116 against which the abutment portions 105 of the XYZ phase relay terminals 73 (73X, 73Y, 73Z) abut, and an insertion hole 117 through which the press-fit fixing portions 102 of each relay terminal 73 are inserted.

[0088] The busbar holder 74 is provided with a plurality of legs 118 extending in the axial direction at a predetermined interval in the circumferential direction. Each leg 118 has the same length in the axial direction. As shown in FIG. 18, when the busbar module 70 is assembled to the stator 30, each leg 118 is disposed radially outside the insulating member 63 provided at the coil end of the stator 30, and the tip of each leg 118 abuts on the axial end face of the stator core 31. As a result, the busbar module 70 is coaxial with the stator 30 and is provided at a predetermined height from the axial end face of the stator core 31. The integrated body of the stator 30 and the busbar module 70 corresponds to a "stator unit."

[0089] As shown in Fig. 10 and Fig. 11, when the bus bars 71, 72 are assembled to the bus bar holder 74, the main body portions 81, 91 of the bus bars 71, 72 are accommodated in the bus bar accommodation grooves 111, and the arm portions 83, 93 are arranged to cross the bus bar accommodation grooves 111 in the radial direction. Although not shown in Fig. 10 and Fig. 11, the press-fit fixing portions 82, 92 of the bus bars 71, 72 are press-fitted into the insertion holes 112 of the bus bar holder 74, thereby fixing the bus bars 71, 72 to the bus bar holder 74. In this state, the U-shaped portions including the folded portions 83a, 93a at the tip portions of the arm portions 83, 93 are arranged in positions surrounding the through holes 113. The tip portions of the conductor ends 36 inserted into the through holes 113 are joined to the arm portions 83, 93 by welding or the like.

[0090] In a busbar holder 74, in a configuration in which two power line busbars 71 are lined up circumferentially in busbar accommodating grooves 111 of the same radius, the number of busbar accommodating grooves 111 in the radial direction (number of radial rows) can be reduced, but it may become difficult to unify the orientation of the arm portions 83 extending radially from the power line busbars 71.

[0091] 10 and 11, the arm portion 83 of each power line bus bar 71 is supported by each arm support portion 114 arranged in the circumferential direction radially outward from each bus bar receiving groove 111 that holds the power line bus bar 71. Some power line bus bars 71 have arm portions 83 that extend obliquely relative to the radial direction (extending not only radially but also circumferentially), but in all power line bus bars 71, the orientation of the arm portions 83 radially outward from the arm support portions 114 is aligned along a radial line that extends linearly from the center point C of the stator 30 (see FIG. 11). In particular, in this embodiment, in all bus bars 71 and 72 including the neutral point bus bar 72, the orientation of the arm portions 83 and 93 near the through hole 113 is aligned along a radial line that extends linearly from the center point C of the stator 30. As a result, the arm portions 83 of the bus bars 71, 72 are arranged in the same orientation at positions circumferentially adjacent to each through hole 113. In this case, the orientation of the arm portions 83 near the conductor end portion 36 can be properly corrected by the arm support portion 114. By aligning the orientation of all the arm portions 83, welding of the arm portions 83 can be easily and accurately performed.

[0092] Further, the relay terminals 73 of each phase are attached to the terminal support portions 115 of the busbar holder 74. Although not shown in Fig. 10 and Fig. 11, the press-fit fixing portions 102 of each relay terminal 73 are press-fitted into the insertion holes 117 of the busbar holder 74, thereby fixing each relay terminal 73 to the busbar holder 74. In this state, the joint terminal portions 85 of the power line busbar 71 and the joint terminal portions 104 of the relay terminal 73 overlap in the radial direction and are joined to each other by welding or the like.

[0093] The characteristic configuration of the bus bar module 70 of this embodiment will be described in more detail below.

[0094] <Details of Relay Terminal 73> In the motor 10, in a configuration in which the power line bus bar 71 and the circuit board 55 are electrically connected by the relay terminal 73, there is a concern that if unnecessary stress acts on the relay terminal 73 due to an assembly error or vibrations generated by the motor 10, the relay terminal may be damaged or otherwise damaged. In this embodiment, therefore, a bent portion 103 is provided between the power line bus bar 71 and the circuit board 55 in the relay terminal 73. This is the configuration shown in FIG. 16, and even if unnecessary stress acts on the relay terminal 73, the stress is mitigated by deformation of the bent portion 103. This makes it possible to suppress problems such as damage to the relay terminal 73.

[0095] In the busbar module 70, as shown in Fig. 10 and Figs. 15(a) and (b), the relay terminals 73 (73U, 73V, 73W) of the UVW phases and the relay terminals 73 (73X, 73Y, 73Z) of the XYZ phases are arranged side by side in the circumferential direction. The relay terminals 73 are provided with their bent portions 103 extending in the circumferential direction in a plan view. This makes it difficult for the bent portions 103 to come into contact with the housing 20 on the radial outside, as compared to a configuration in which the bent portions 103 extend in the radial direction, thereby suppressing problems such as loss of insulation.

[0096] In addition, the bent portions 103 of the circumferentially adjacent relay terminals 73 overlap each other when viewed in the axial direction. This allows the relay terminals 73 arranged in the circumferential direction to be disposed close to each other, while maximizing the degree of bending, thereby achieving the desired stress relaxation in each relay terminal 73.

[0097] Fig. 19 is a diagram showing a state in which circuit board 55 is attached to relay terminal 73 extending axially from busbar holder 74. As shown in Fig. 19, through hole 55a is formed in circuit board 55, and connection end 101 of relay terminal 73 is inserted into through hole 55a. Connection end 101 is connected to circuit board 55 by solder or the like. Circuit board 55 is fixed to end plate portion 23 of housing 20 by fasteners 57 such as screws.

[0098] Here, on the circuit board 55, the distance from the connection position of each relay terminal 73 to the fixing position (screw fixing position) of the fastener 57 is different, and the magnitude of the stress that each relay terminal 73 receives from the circuit board 55 differs depending on the distance. Therefore, in this embodiment, the degree of bending of the bent portion 103 of each relay terminal 73 is made different depending on the distance from the connection position of each relay terminal 73 to the screw fixing position on the circuit board 55.

[0099] 19, V-phase terminal 73V is closest to the screw fixing position. Therefore, the degree of bending of bent portion 103 of V-phase terminal 73V is greater than those of W-phase terminal 73W and U-phase terminal 73U. This allows appropriate stress relaxation to be performed for each relay terminal 73 even if the stress applied to each relay terminal 73 is different.

[0100] In addition, in a state where the relay terminal 73 is assembled to the busbar holder 74, the press-fit fixing portion 102 of the relay terminal 73 is press-fitted into the insertion hole 117 of the busbar holder 74, and the abutting portion 105 of the relay terminal 73 is abutted against the pedestal portion 116 of the busbar holder 74. In this case, even if stress occurs on the axial compression side of the relay terminal 73, the stress can be received by the axial end face of the busbar holder 74 (i.e., the pedestal portion 116). In addition, in the relay terminal 73, the joint terminal portion 104 of the relay terminal 73 joined to the power line busbar 71 is provided on the abutting portion 105 abutting against the axial end face of the busbar holder 74, so that the displacement of the joint terminal portion 104 is suppressed. This suppresses inconveniences such as damage to the joint portions of the joint terminal portions 85, 104 between the power line busbar 71 and the relay terminal 73.

[0101] 19, the relay terminal 73 is configured to have a plurality of bent portions in opposite directions at the bend 103. In this case, by increasing the number of bends at the bend 103, the dimension in the width direction (the left-right direction in the figure) is reduced, and the relay terminals 73 lined up in the circumferential direction can be arranged close to each other.

[0102] In addition, in the relay terminal 73, the rising portion rising from the abutment portion 105 and the connection end portion 101 on the circuit board 55 side are offset from each other in a direction perpendicular to the axial direction. In this case, stress relaxation is easier to achieve than in a configuration in which the rising portion rising from the abutment portion 105 and the connection end portion 101 on the circuit board 55 side are not offset.

[0103] Furthermore, in a configuration in which the bent portion 103 is provided in the relay terminal 73, it becomes necessary to secure space in the axial direction for the bent portion 103, and there is a concern that the motor shaft length will become excessively long. In this regard, in this embodiment, the bent portion 103 of the relay terminal 73 is disposed in a hollow portion 24 formed around the boss portion 23a in the end plate portion 23 of the housing 20. The configuration will be described with reference to FIG.

[0104] 18, the housing 20 to be assembled to the stator unit consisting of the stator 30 and the busbar module 70 is simply shown by phantom lines. As described above, the end plate portion 23 of the housing 20 has an annular cavity 24 formed around the boss portion 23a (see FIG. 1), and at least a part of the bent portion 103 of the relay terminal 73 is housed in the cavity 24. In this case, the bent portion 103 is provided at a position aligned radially with the bearing 26, which provides the relay terminal 73 with a desired stress relaxation structure while preventing the motor shaft length from becoming excessively long.

[0105] <Fixing structure of power line bus bar 71> 10 etc., in busbar module 70, power line busbar 71 is fixed to busbar holder 74 by a plurality of press-fit fixing portions 82, and relay terminal 73 is fixed to busbar holder 74 by press-fit fixing portions 102, and in this state, joint terminal portion 85 of power line busbar 71 and joint terminal portion 104 of relay terminal 73 are joined to each other. In this case, it is necessary to properly join each of joint terminal portions 85, 104 of power line busbar 71 and relay terminal 73 to each other.

[0106] When the press-fit fixing portion 82 of the power line busbar 71 is inserted into the insertion hole 112 provided in the busbar holder 74 to fix the power line busbar 71, it is desirable to provide a margin in the insertion hole 112 in consideration of ease of assembly, etc. In this case, if the margin provided in the insertion hole 112 causes the power line busbar 71 to shift in position, there is a concern that poor connection will occur due to misalignment of the connecting terminal portions 85, 104 of the power line busbar 71 and the relay terminal 73.

[0107] In this embodiment, the press-fitting structure of the press-fitting portion 82 provided in the vicinity of the joining terminal portion 85 of the power line bus bar 71 is different from that of the other press-fitting portions 82, thereby suppressing poor joining due to misalignment of the joining terminal portions 85, 104 of the power line bus bar 71 and the relay terminal 73. In FIG. 13 described above, one of the press-fitting portions 82 is a first fixing portion 82A provided in the vicinity of the standing portion 84 (joint terminal portion 85) in the circumferential direction, and the other is a second fixing portion 82B that is farther from the standing portion 84 than the first fixing portion 82A. In this case, the first fixing portion 82A and the second fixing portion 82B have different press-fitting structures.

[0108] Here, the configuration of the power line bus bar 71 will be described again. FIG. 20 is a diagram showing an enlarged view of the first fixing portion 82A in the power line bus bar 71, (a) is a front view of the first fixing portion 82A, and (b) is a side view of the first fixing portion 82A. Further, FIG. 21 is a diagram showing an enlarged view of the second fixing portion 82B in the power line bus bar 71, (a) is a front view of the second fixing portion 82B, and (b) is a side view of the second fixing portion 82B. In FIGS. 20 and 21, the insertion hole 112 into which the first fixing portion 82A is inserted in the bus bar holder 74 is shown as the insertion hole 112A, and the insertion hole 112 into which the second fixing portion 82B is inserted is shown as the insertion hole 112. In FIGS. 20 and 21, in (a), the left - right direction is the circumferential direction, and in (b), the left - right direction is the radial direction.

[0109] As shown in FIG. 20(a), the width dimensions of the first fixing portion 82A of the power line bus bar 71 are different between the insertion tip side and the insertion base end side with respect to the insertion hole 112A, and the width dimension D1 on the insertion tip side and the width dimension D2 on the insertion base end side are in the relationship of D1 < D2. That is, the first fixing portion 82A has a substantially wedge - like shape in a front view. The circumferential hole dimension D3 of the insertion hole 112A is larger than the width dimension D1 on the insertion tip side of the first fixing portion 82A and smaller than the width dimension D2 on the insertion base end side (D1 < D3 < D2). In this case, the first fixing portion 82A is a press - fit fixing portion into which press - fitting is performed in the circumferential direction with respect to the insertion hole 112A. Further, in the first fixing portion 82A, the protruding portion 121 that protrudes in a wedge - like shape in the circumferential direction serves as a circumferential positioning portion for positioning the power line bus bar 71 in the circumferential direction.

[0110] Also, as shown in FIG. 20(b), the first fixing portion 82A is provided with a protruding portion 122 that protrudes in the radial direction. In the present embodiment, the protruding portion 122 is provided so as to protrude inward in the radial direction. As a result, in the first fixing portion 82A, the thickness dimension is D4 at a portion other than the protruding portion 122, and the thickness dimension is D5 at the protruding portion 122 (D4 < D5). The thickness dimension D4 is the thickness of the plate material of the power line bus bar 71. If the radial hole dimension of the insertion hole 112A is D6, then D4 < D6 and D5 = D6. Note that D5 > D6 may also be possible.

[0111] In the first fixing portion 82A of the power line bus bar 71, it is press-fitted and fixed to the insertion hole 112A by an overhanging shape (wedge shape) in the circumferential direction, and the play in the insertion hole 112A is suppressed by the protruding portion 122 protruding in the radial direction. Thereby, in the first fixing portion 82A, the holding force and the positional accuracy in the insertion hole 112A are ensured.

[0112] On the other hand, as shown in Fig. 21(a), the width dimension D11 of the second fixing portion 82B of the power line bus bar 71 is smaller than the circumferential hole dimension D12 of the insertion hole 112B (D11 < D12).

[0113] Further, as shown in Fig. 21(b), the second fixing portion 82B is provided with a protruding portion 123 protruding in the radial direction. In the present embodiment, the protruding portion 123 is provided so as to protrude inward in the radial direction. Thereby, in the second fixing portion 82B, the thickness dimension is D13 at a portion other than the protruding portion 123, and the thickness dimension is D14 at the protruding portion 123 (D13 < D14). The thickness dimension D13 is the thickness of the plate material of the power line bus bar 71 (D13 = D4). If the radial hole dimension of the insertion hole 112B is D15, then D13 < D15 and D14 = D15. Note that D14 > D15 may also be possible. In this case, the second fixing portion 82B is a press-fitting fixing portion into which press-fitting is performed in the radial direction with respect to the insertion hole 112B.

[0114] According to the configurations of FIGS. 20 and 21 described above, the first fixing portion 82A is provided with a circumferential positioning portion (overhanging portion 121) for positioning the power line bus bar 71 in the circumferential direction, while the second fixing portion 82B is not provided with a circumferential positioning portion. That is, in the power line bus bar 71, the circumferential positioning is performed only by the first fixing portion 82A among the first fixing portion 82A and the second fixing portion 82B. In this case, the displacement of the joining terminal portion 85 is suppressed in the vicinity of the first fixing portion 82A, and the circumferential bus bar position regulation in the second fixing portion 82B is suppressed. Thereby, the mutual joining of the power line bus bar 71 and the relay terminal 73 can be properly performed.

[0115] In each of the insertion holes 112A, 112B, the radial hole dimensions D6, D15 are larger than the plate thickness (D4, D13 in Fig. 20(b) and Fig. 21(b)) of the power line bus bar 71, so that a gap is formed in the radial direction between each of the fixing portions 82A, 82B and the inner wall of the insertion hole 112A, 112B. Also, each of the fixing portions 82A, 82B is provided with protruding portions 122, 123 that protrude in the radial direction, and the fixing portions 82A, 82B are press-fit and fixed by the protruding portions 122, 123.

[0116] In each of the fixing parts 82A, 82B, the protruding parts 122, 123 may be extrusion molded by, for example, press processing. In each of the fixing parts 82A, 82B, the number of the protruding parts 122, 123 may be two or more. In addition, the protruding parts 122, 123 may be formed by bending the tip of each of the fixing parts 82A, 82B, or the protruding parts 122, 123 may be formed by crushing the tip of each of the fixing parts 82A, 82B.

[0117] First fixing portion 82A is press-fitted and fixed to insertion hole 112A by a press-fit allowance of overhanging portion 121 provided in the circumferential direction of first fixing portion 82A. In contrast, second fixing portion 82B is press-fitted and fixed to insertion hole 112B by protrusion 123 provided in the radial direction of second fixing portion 82B. In this case, the press-fit holding force of first fixing portion 82A is greater than the press-fit holding force of second fixing portion 82B. This allows power line busbar 71 to preferentially suppress circumferential positional deviation at first fixing portion 82A.

[0118] It is preferable that the protruding dimension (=D14-D13) of the protruding portion 123 of the second fixing portion 82B is greater than the protruding dimension (=D5-D4) of the protruding portion 122 of the first fixing portion 82A.

[0119] FIG. 22 is a perspective view showing an enlarged view of a terminal joining portion in the power line bus bar 71 and the relay terminal 73, and FIG. 23 is a plan view similarly showing an enlarged view of the terminal joining portion. In FIGS. 22 and 23, the joining portion with the power line bus bar 71 is enlarged and shown for the relay terminals 73 (73X, 73Y, 73Z) of the XYZ phases. Further, FIG. 24 is a cross-sectional view taken along line 24-24 of FIG. 23.

[0120] As shown in FIGS. 22 to 24, in the power line bus bar 71 and the relay terminal 73, the respective joining terminal portions 85 and 104 are joined in a state of being in contact with each other in the radial direction. In this case, it is desirable to bring the respective joining terminal portions 85 and 104 as close as possible in the radial direction. However, if the radial dimension of the insertion hole 112 of the bus bar holder 74 is excessive with respect to the radial dimension of the press-fitting fixing portion 82 of the power line bus bar 71 (that is, D4 < D6 in FIG. 20(b)), while the assemblability of the power line bus bar 71 with respect to the bus bar holder 74 becomes good, there is a concern that the joining terminal portion 85 may unintentionally move away from the joining terminal portion 104 on the relay terminal 73 side in the radial direction.

[0121] In this regard, in the present embodiment, as shown in FIG. 24, in the power line bus bar 71, a protruding portion 122 that protrudes in the radial direction to the opposite side (the inner side in the radial direction in the present embodiment) of the relay terminal 73 is provided at the first fixing portion 82A located in the vicinity of the joining terminal portion 85, and the protruding portion 122 is configured to be in contact with the inner wall of the insertion hole 112A. In this case, the first fixing portion 82A is pressed against the side opposite to the protruding portion 122 (the right side in the figure) in the insertion hole 112A. Thereby, inconveniences such as the joining terminal portion 85 of the power line bus bar 71 unintentionally moving away from the joining terminal portion 104 of the relay terminal 73 in the radial direction are suppressed.

[0122] 23, the terminal joints of the power line busbar 71 and the relay terminal 73 for each phase are configured so that their joint surfaces are aligned linearly along a straight line LA. This improves the workability when welding the terminal joints of each phase. In other words, it becomes easier to determine the positions of the welding points, and the number of welding steps can be reduced.

[0123] <Fixing structure of neutral bus bar 72> In a configuration in which the neutral point bus bar 72 is disposed radially outward of the power line bus bar 71 in the bus bar holder 74, there is a concern that the tip of the arm portion 93 of the neutral point bus bar 72 may excessively protrude radially outward and may unintentionally come into contact with the housing 20 or the like. In particular, when the neutral point bus bar 72 is disposed radially near the outer periphery of the bus bar holder 74, the length of the arm portion 93 becomes short, and depending on the bending shape, etc., there is a greater concern that the radial tip side of the arm portion 93 may protrude. A countermeasure against this will be described with reference to FIG. 25. FIG. 25 is a plan view of the neutral point bus bar 72 as viewed from the side of the press-fit fixing portion 92.

[0124] In Fig. 25, the press-fit fixing portion 92 of the neutral point bus bar 72 is provided with a protruding portion 131 that protrudes radially outward. This protruding portion 131 may be extruded by pressing, similar to the protruding portion 122 described in Fig. 20 and other figures. When the press-fit fixing portion 92 of the neutral point bus bar 72 is inserted into the insertion hole 112 of the bus bar holder 74, the protruding portion 131 of the press-fit fixing portion 92 abuts against the radially outer inner wall of the insertion hole 112. In other words, the press-fit fixing portion 92 is pressed against the opposite side (radially inward) from the protruding portion 131 within the insertion hole 112. This makes it possible to prevent the tip of the arm portion 93 of the neutral point bus bar 72 from protruding excessively radially outward.

[0125] As shown in FIG. 14, the neutral point bus bar 72 may include a number of press-fit fixing portions 92 arranged circumferentially, including some (having an approximately wedge shape) that are press-fitted circumferentially in the same manner as the first fixing portion 82A of the power line bus bar 71, and some that are press-fitted radially in the same manner as the second fixing portion 82B.

[0126] <Welding structure of conductor end 36> One possible configuration for joining the arm portion 83 of the power line bus bar 71 and the conductor end 36 of the phase winding is to join the arm portion 83 and the conductor end 36 to each other by welding. In this case, however, if the arm portion 83 and the conductor end 36 are too far apart, there is a concern that it may be difficult to properly weld the arm portion 83 and the conductor end 36. This concern may also arise at the joint between the arm portion 93 of the neutral point bus bar 72 and the conductor end 36. A countermeasure to this problem will be described below.

[0127] Fig. 26 is an enlarged perspective view showing the configuration of the joint portions between the power line bus bar 71 and the neutral point bus bar 72 and the conductor end portion 36 in the bus bar module 70, and Fig. 27 is a plan view showing the configuration of the joint portions. In Fig. 27, the housing 20 is shown in imaginary lines on the radially outer side of the bus bar holder 74. Fig. 28(a) is a vertical cross-sectional view of the through hole 113 in the bus bar holder 74 (cross-sectional view taken along line 28-28 in Fig. 27), and Fig. 28(b) is a front view of the through hole 113 of the bus bar holder 74 as viewed from the stator 30 side (first surface F1 side).

[0128] The busbar holder 74 is provided with a through hole 113 penetrating in the axial direction, and the conductor end 36 is inserted into the through hole 113 from a first surface F1 on the stator 30 side of both axial faces of the busbar holder 74. The tip of the conductor end 36 protrudes from a second surface F2 opposite to the first surface F1. On the second surface F2 side of the busbar holder 74, the tip of the conductor end 36 and the arm portion 83 of the power line busbar 71 intersect with each other, and are joined to each other by welding at the intersection. In FIG. 27, the welded portion between the conductor end 36 and the arm portion 83 of the power line busbar 71 is indicated as WP.

[0129] As shown in FIGS. 28(a) and 28(b), the through hole 113 of the busbar holder 74 is provided with a tapered guide portion 141 that is expanded toward the first surface F1 side. The center P1 of the guide portion 141 is eccentric to the opposite side of the arm welded portion (WP) of the power line busbar 71 in the direction crossing the through hole 113. In this case, when the conductor end portion 36 is inserted into the through hole 113 of the busbar holder 74, the guide portion 141 guides the conductor end portion 36 into the through hole 113. In addition, since the center P1 of the guide portion 141 in the through hole 113 is eccentric to the opposite side of the arm welded portion in the direction crossing the through hole 113, it is possible to incline the conductor end portion 36 on the second surface F2 side of the busbar holder 74 toward the side approaching the arm welded portion. The through hole 113 configured as described above allows the conductor end 36 to be tilted toward the arm welded portion, but restricts the conductor end 36 from being tilted away from the arm welded portion, thereby allowing the conductor end 36 and the power line bus bar 71 to be properly welded.

[0130] The guide portion 141 is provided eccentrically in the circumferential direction with respect to the center of the through hole 113. This causes the tip of the conductor end portion 36 to tilt in the circumferential direction. This prevents the tip of the conductor end portion 36 from unintentionally tilting in the radial direction and coming into contact with the housing 20.

[0131] 27, the outer periphery of the busbar holder 74 is radially inward relative to the housing 20, and the arm portion 83 of the power line busbar 71 does not protrude radially outward relative to the outer periphery of the busbar holder 74. This prevents unintended contact between the power line busbar 71 and the housing 20. In addition, as described above, the conductor end 36 inclines in the circumferential direction, and does not incline radially outward, thereby preventing the arm portion 83 from being pushed radially outward by the conductor end 36, which would cause the arm portion 83 to come into contact with the housing 20.

[0132] Furthermore, on the second surface F2 of the busbar holder 74, a protrusion 142 is provided on the opposite side of the folded-back tip portion of the arm portion 83 across the through hole 113 in the radial direction. That is, the protrusion 142 is provided on the opening side of the U-shaped portion of the arm portion 83. In this case, on the second surface F2 side of the busbar holder 74, the folded-back apex of the arm portion 83 is disposed on the radial outside of the through hole 113, and the protrusion 142 is disposed on the radial inside of the through hole 113. This restricts radial positional deviation of the conductor end portion 36 inserted into the through hole 113.

[0133] The arm portion 83 is adjacent to the conductor end 36 in the circumferential direction, and the side opposite to the folded-back portion 83a forms a welded portion (i.e., an arm welded portion). The arm portion 83 is provided with a bulging portion 143 that bulges out toward the side away from the second surface F2 of the busbar holder 74 at a position that forms the arm welded portion. In this case, by raising the welded portion of the arm portion 83 in the configuration that allows the conductor end 36 to be tilted toward the side approaching the arm portion 83 as described above, it is possible to bring the conductor end 36 and the arm portion 83 (busbar welded portion) closer to each other.

[0134] In this embodiment, the arm portion 83 is joined to the conductor end 36 by welding, without crimping the U-shaped portion. In other words, crimping (i.e., a mechanical connection structure) is not necessarily required to electrically connect the arm portion 83 and the conductor end 36.

[0135] Although not illustrated in the drawings, the welded portion between arm portion 93 of neutral point bus bar 72 and conductor end portion 36 has a similar configuration to arm portion 83 of power line bus bar 71 .

[0136] The configuration of Fig. 28 may be modified as shown in Fig. 29. In Fig. 29, (a) shows a vertical cross section of through hole 113 in busbar holder 74, (b) shows a bottom view of through hole 113, and (c) shows a top view of through hole 113.

[0137] As shown in FIG. 29, the through hole 113 of the busbar holder 74 may be configured such that a guide portion 141 is provided on the first surface F1 side and a guide portion 144 (second guide portion) is provided on the second surface F2 side. The guide portion 141 is expanded toward the first surface F1 side, and its center P1 is eccentric to the opposite side of the arm welded portion (WP) of the power line busbar 71 in the direction crossing the through hole 113. The guide portion 144 is expanded toward the second surface F2 side, and its center P2 is eccentric to the side of the arm welded portion (WP) of the power line busbar 71 in the direction crossing the through hole 113. This encourages the conductor end 36 to be inclined toward the side approaching the arm welded portion on both the first surface F1 side and the second surface F2 side of the through hole 113. This allows proper welding of the conductor end 36 and the power line busbar 71.

[0138] However, in rotating electrical machines, noise and vibration due to torque ripple are a problem. Torque ripple is mainly composed of the 6th harmonic component or the 12th harmonic component, so it is desirable to suppress these. Therefore, it is preferable to use the motor 10 configured as described above and perform the following control in the control device 50.

[0139] In the motor 10 having the above configuration, The U-phase, V-phase, and W-phase partial windings (first coil bodies) of the first stator winding 32a are wound around the first teeth (T1, T4, T7, T10, T13, T16) of each tooth group, A partial winding (second coil body) of one phase of each of the first and second stator windings 32a and 32b is wound around the second teeth (T2, T5, T8, T11, T14, T17) of each tooth group, The X-phase, Y-phase and Z-phase partial windings (third coil bodies) of the second stator winding 32b are wound around the third teeth (T3, T6, T9, T12, T15, T18) of each tooth group.

[0140] In this configuration, the control device 50 sets a combined phase difference between the magnetomotive force generated by the partial winding of the first stator winding 32a wound around the second teeth and the magnetomotive force generated by the partial winding of the second stator winding 32b wound around the second teeth so that the phase difference between the magnetomotive force of the second coil body of each phase and the magnetomotive force of the third coil body of each phase and the magnetomotive force of the second coil body of each phase are within a predetermined phase range including 20 degrees in electrical angle, or the phase difference between the magnetomotive force of the third coil body of each phase and the magnetomotive force of the first coil body of each phase and the magnetomotive force of the second coil body of each phase and the magnetomotive force of the third coil body of each phase are within a predetermined phase range including 20 degrees in electrical angle. The combined phase difference may be set, for example, in a range of 72 to 88 degrees in electrical angle. Alternatively, the control device 50 sets a combined phase difference between a current flowing through a partial winding of the first stator winding 32a wound around the second teeth and a current flowing through a partial winding of the second stator winding 32b wound around the second teeth. Details of this control are described in detail in Japanese Patent No. 7103299 filed by the applicant of the present application.

[0141] (Other embodiments) The above embodiment may be modified, for example, as follows.

[0142] In the busbar module 70, the configuration of the terminal joint portion between the power line busbar 71 and the relay terminal 73 may be changed as follows. Fig. 30 is a diagram showing a cross-sectional structure of the terminal joint portion between the power line busbar 71 and the relay terminal 73, and this diagram is a partial modification of the configuration shown in Fig. 24.

[0143] 30(a), a convex portion 151 may be provided on an axial end surface of the busbar holder 74, and abutment portion 105 provided between bent portion 103 and press-fitted fixed portion 102 in relay terminal 73 may abut against convex portion 151. In this way, when axial stress is generated in relay terminal 73, the stress can be absorbed by deformation of convex portion 151 on the busbar holder 74 side, and the stress relaxation effect in relay terminal 73 can be further enhanced.

[0144] 30(b), the press-fit fixing portion 102 of the relay terminal 73 may be provided with a protrusion 152 that protrudes radially toward the opposite side (radially outward) of the power line bus bar 71, and the protrusion 152 may be configured to abut against the inner wall of the insertion hole 117. In this case, coupled with the configuration in which the first fixing portion 82A of the power line bus bar 71 is provided with a protrusion 122 that protrudes radially inward, the joining terminal portion 85 of the power line bus bar 71 and the joining terminal portion 104 of the relay terminal 73 can be brought closer to each other in the radial direction, and the joining of these joining terminal portions 85, 104 can be more appropriately performed.

[0145] As shown in Fig. 20 and Fig. 21, the fixing portions 82A, 82B of the power line bus bar 71 are provided with the protruding portions 122, 123 protruding radially inward, but this may be changed. As with the protruding portion 131 of the press-fit fixing portion 92 of the neutral point bus bar 72 shown in Fig. 25, the protruding portions 122, 123 of the fixing portions 82A, 82B of the power line bus bar 71 may be provided to protrude radially outward. Note that, in the power line bus bar 71, of the protruding portion 122 of the first fixing portion 82A and the protruding portion 123 of the second fixing portion 82B, only the protruding portion 123 of the second fixing portion 82B may be provided to protrude radially outward.

[0146] In the busbar holder 74 that holds the power line busbar 71, when the conductor end 36 is inserted into the through hole 113 located radially outward from the power line busbar 71 and the arm portion 83 of the power line busbar 71 is joined to the conductor end 36, there is a concern that the tip of the arm portion 83 may excessively protrude radially outward and unintentionally come into contact with the housing 20 or the like. In this regard, the fixing portions 82A, 82B of the power line busbar 71 are provided with protruding portions 122, 123 that protrude radially outward, and the protruding portions 122, 123 are configured to abut against the inner wall of the insertion hole 112. This makes it possible to prevent the tip of the arm portion 83 from excessively protruding radially outward.

[0147] The busbar module 70 may be configured as shown in FIG. 31. In the configuration of FIG. 31, the configuration of the neutral point bus bar 72 is different from that of FIG. 11. Specifically, in FIG. 11, the two neutral point bus bars 72A and 72D on the outermost side in the radial direction have the same shape in a plan view, and the neutral point bus bars 72A and 72D are arranged in point symmetry. Similarly, the two neutral point bus bars 72B and 72C on the second row on the outer side in the radial direction have the same shape in a plan view, and the neutral point bus bars 72B and 72C are arranged in point symmetry. In contrast, in FIG. 31, the two neutral point bus bars 72A and 72D on the outermost side in the radial direction have line symmetric shapes in a plan view, and the two neutral point bus bars 72B and 72C on the second row on the outer side in the radial direction have line symmetric shapes in a plan view.

[0148] In the circuit board 55, the through hole 55a through which the connection end 101 of the relay terminal 73 is inserted may be configured as follows: Fig. 32(a) is a plan view of the circuit board 55, and Fig. 32(b) is a cross-sectional view in the thickness direction of the circuit board 55 (cross-sectional view taken along line 32-32 in Fig. 32(a)).

[0149] The through hole 55a of the circuit board 55 is provided with a tapered guide portion 161 that is expanded toward the lower surface side (the busbar module 70 side). The center of the guide portion 161 is eccentric toward the radially outward side. In this case, when the connection end portion 101 of the relay terminal 73 is inserted into the through hole 55a of the circuit board 55, the guide portion 161 guides the relay terminal 73 into the through hole 55a. In addition, since the center of the guide portion 161 in the through hole 55a is eccentric toward the radially outward side, the tip portion of the relay terminal 73 can be inclined toward the radially inward side on the upper surface side of the circuit board 55. The through hole 55a of the above configuration allows the tip portion of the relay terminal 73 to be inclined toward the radially inward side, but restricts it from being inclined toward the radially outward side. It is possible to suppress the relay terminal 73 from unintentionally approaching the radially outward side (i.e., the housing 20 side).

[0150] In the above embodiment, in the power line bus bar 71 and the neutral point bus bar 72, the opposite side of the folded-back portion 83a, 93a of the arm portion 83, 93 is the arm welded portion, but this may be changed. For example, the folded-back portion 83a, 93a of the arm portion 83, 93 may be the arm welded portion, or the top of the U-shaped folded-back portion may be the arm welded portion. Also, the arm portion 83, 93 may not have the folded-back portion 83a, 93a, and the arm tip portion may be L-shaped or I-shaped (straight shape).

[0151] 15 and the like, the relay terminals 73 for each phase include those having bent portions 103 with different shapes, but this may be changed. It is also possible for the bent portions 103 of the relay terminals 73 for three phases arranged side by side in the circumferential direction to all have the same shape.

[0152] In addition, relay terminal 73 has been configured to have press-fit fixing portion 102 as a fixing portion relative to busbar holder 74 (see FIG. 16 etc.), but this may be changed. For example, relay terminal 73 may have, as a fixing portion relative to busbar holder 74, a welded portion that is welded to busbar holder 74 or a fastened portion that is fastened to busbar holder 74 with a screw. Alternatively, relay terminal 73 may not have a fixing portion that is fixed to busbar holder 74, and may be indirectly held relative to busbar holder 74 by having joint terminal portion 104 joined to joint terminal portion 85 of power line busbar 71.

[0153] In the above embodiment, the first fixed portion 82A of the power line bus bar 71 is configured to be press-fitted by making the first fixed portion 82A approximately wedge-shaped when viewed from the front (see FIG. 20(a)). However, this may be modified so that the first fixed portion 82A is rectangular when viewed from the front and the insertion hole 112A is tapered to a narrower shape, thereby allowing the first fixed portion 82A to be press-fitted.

[0154] In the above embodiment, the power line busbar 71 of the busbar module 70 has the busbar fixing portions provided as press-fit fixing portions 82 (first fixing portion 82A, second fixing portion 82B), but this may be changed. Of the busbar fixing portions of the power line busbar 71, the first fixing portion 82A in the vicinity of the joining terminal portion 85 may be positioned in the circumferential direction by a concave-convex engagement with the busbar holder 74. As for the second fixing portion 82B, it is sufficient that it is press-fitted in the radial direction, as described above.

[0155] In the busbar holder 74, three or more power line busbars 71 may be arranged side by side in the circumferential direction in the busbar accommodating grooves 111 having the same radius. Also, in the busbar holder 74, only one power line busbar 71 may be arranged in the circumferential direction in the busbar accommodating grooves 111 having the same radius.

[0156] In the above embodiment, the busbar holder 74 of the busbar module 70 is configured to have through holes 113 for inserting the conductor end portions 36 on the radial outside of the busbar accommodating grooves 111 of each busbar 71, 72. However, this may be modified so that the through holes 113 for inserting the conductor end portions 36 are provided on the radial inside of the busbar accommodating grooves 111 of each busbar 71, 72.

[0157] The first stator winding 32a and the second stator winding 32b may have a configuration as shown in Fig. 33. In the first stator winding 32a shown in Fig. 33(a), the U-phase partial windings U2 and U3, the V-phase partial windings V1 and V4, and the W-phase partial windings W2 and W3 are connected to each other at a neutral point N1. In the second stator winding 32b shown in Fig. 33(b), the X-phase partial windings X2 and X3, the Y-phase partial windings Y2 and Y3, and the Z-phase partial windings Z1 and Z4 are connected to each other at a neutral point N2. In this case, it is preferable that the neutral point connection is performed by one neutral point bus bar in each of the stator windings 32a and 32b.

[0158] In the stator core 31, each split core 61 may have multiple teeth 34. For example, the split core 61 may have three teeth 34. The stator core 31 may not have a split core structure, that is, may have an integral annular structure that cannot be divided in the circumferential direction.

[0159] The number of teeth of the stator core 31 may be other than 18. In this case, however, the number of teeth should be 3×n. Also, the number of poles of the rotor 40 may be other than 14.

[0160] In the above embodiment, the stator winding 32 has the first stator winding 32a and the second stator winding 32b, and is configured to have a total of six phase windings. However, this may be modified so that the stator winding 32 has a set of three phase windings.

[0161] The rotating electric machine may be an outer rotor type rotating electric machine instead of an inner rotor type rotating electric machine. In the outer rotor type rotating electric machine, the back yoke 33 is located radially inward in the stator core 31, and the teeth 34 are provided so as to extend radially outward from the back yoke 33. In this configuration, as in the above, it is preferable that the busbar module 70 is provided on the axial end side of the stator 30.

[0162] The technical ideas extracted from the above-described embodiments will be described below. [Configuration 1] a power line bus bar (71) provided for each phase winding of the stator winding (32); A relay terminal (73) provided for each of the power line bus bars of each phase and connected to the power line bus bar; a bus bar holder (74) for holding the power line bus bar and the relay terminal, A busbar module (70) arranged on an axial end side of a cylindrical stator (30), the power line bus bar has an arc shape extending in a circumferential direction, and has a plurality of bus bar fixing portions (82) fixed to the bus bar holder at a plurality of locations spaced apart from one another in the circumferential direction, and has a bus bar joint portion (85) which is a joint portion with the relay terminal, The relay terminal has a terminal fixing portion (102) that is fixed to the bus bar holder, and also has a terminal joint portion (104) that is a joint portion with the power line bus bar, the power line bus bar is fixed to the bus bar holder by the plurality of bus bar fixing portions, and the relay terminal is fixed to the bus bar holder by the terminal fixing portion, and in this state, the bus bar joint portion and the terminal joint portion are joined to each other, one of the plurality of bus bar fixing portions is a first fixing portion (82A) provided in the vicinity of the bus bar joint, and the remaining bus bar fixing portions are second fixing portions (82B) that are farther from the bus bar joint than the first fixing portion; A busbar module, wherein the first fixed portion is provided with a circumferential positioning portion (121) that positions the power line busbar in the circumferential direction, while the second fixed portion is not provided with the circumferential positioning portion. [Configuration 2] the busbar holder is provided with an insertion hole (112) through which the first fixing portion and the second fixing portion are inserted in a press-fit state, The busbar module according to configuration 1, wherein the first fixing portion is a press-fit fixing portion that is circumferentially press-fitted into the insertion hole, and the second fixing portion is a press-fit fixing portion that is radially press-fitted into the insertion hole. [Configuration 3] 3. The busbar module according to configuration 2, wherein a press-fitting and holding force by the first fixing portion is greater than a press-fitting and holding force by the second fixing portion. [Configuration 4] the bus bar joint portion and the terminal joint portion are joined in a radially abutting state to each other, The busbar module according to configuration 2 or 3, wherein the first fixing portion is provided with a protruding portion (122) that protrudes radially away from the relay terminal and abuts against an inner wall of the insertion hole. [Configuration 5] The busbar holder is provided with a second insertion hole (117) through which the terminal fixing portion of the relay terminal is inserted, The busbar module according to configuration 4, wherein the terminal fixing portion is provided with a protrusion (152) that protrudes radially toward an opposite side of the power line busbar and abuts against an inner wall of the second insertion hole. [Configuration 6] The power line bus bar has a main body portion (81) extending in a circumferential direction and an arm portion (83) extending in a radial direction from the main body portion, the bus bar holder is formed with a plurality of through holes (113) at positions radially outward of the power line bus bar, the through holes penetrating in the axial direction and through which conductor ends (36) extending in the axial direction from the phase windings of each phase are inserted; The arm portion is joined to the end of the conductor inserted into the through hole, The busbar module according to any one of configurations 2 to 5, wherein at least the second fixed portion of the first fixed portion and the second fixed portion is provided with a protrusion (123) that protrudes radially outward and abuts against an inner wall of the insertion hole. [Configuration 7] In the stator winding, the phase windings of each phase are connected at a neutral point, the bus bar holder holds the power line bus bars of each phase, and holds a neutral point bus bar (72) for connecting a neutral point radially outward of the power line bus bars; the neutral point bus bar has a main body portion (91) extending in a circumferential direction and an arm portion (93) extending in a radial direction from the main body portion, and has a plurality of bus bar fixing portions (92) fixed to the bus bar holder at a plurality of locations on the main body portion spaced apart from each other in the circumferential direction; the busbar holder is formed with a plurality of through holes (113) penetrating the busbar holder in the axial direction at a position radially outward of the neutral point busbar, and through which conductor ends (36) extending in the axial direction from the phase windings of each phase are inserted; The arm portion of the neutral bus bar is joined to the end portion of the conductor inserted into the through hole, The busbar module according to any one of configurations 2 to 6, wherein the busbar fixing portion of the neutral point busbar is provided with a protrusion (131) that protrudes radially outward and abuts against an inner wall of the insertion hole. [Explanation of symbols]

[0163] 30... stator, 32... stator winding, 70... busbar module, 71... power line busbar, 73... relay terminal, 74... busbar holder, 82... press-fit fixing portion, 82A... first fixing portion, 82B... second fixing portion, 85... joining terminal portion, 102... press-fit fixing portion, 104... joining terminal portion, 121... extension portion.

Claims

1. A power line bus bar (71) provided for each phase winding of the stator winding (32); A relay terminal (73) provided for each of the power line bus bars of each phase and connected to the power line bus bar; a bus bar holder (74) for holding the power line bus bar and the relay terminal, A busbar module (70) arranged on an axial end side of a cylindrical stator (30), the power line bus bar has an arc shape extending in a circumferential direction, and has a plurality of bus bar fixing portions (82) fixed to the bus bar holder at a plurality of locations spaced apart from each other in the circumferential direction, and has a bus bar joint portion (85) which is a joint portion with the relay terminal, The relay terminal has a terminal fixing portion (102) fixed to the bus bar holder, and also has a terminal joint portion (104) which is a joint portion with the power line bus bar, the power line bus bar is fixed to the bus bar holder by the plurality of bus bar fixing portions, and the relay terminal is fixed to the bus bar holder by the terminal fixing portion, and in this state, the bus bar joint portion and the terminal joint portion are joined to each other, one of the plurality of bus bar fixing portions is a first fixing portion (82A) provided in the vicinity of the bus bar joint, and the remaining bus bar fixing portions are second fixing portions (82B) that are farther from the bus bar joint than the first fixing portion, A busbar module, wherein the first fixing portion is provided with a circumferential positioning portion (121) that positions the power line busbar in the circumferential direction, while the second fixing portion is not provided with the circumferential positioning portion.

2. the busbar holder is provided with an insertion hole (112) through which the first fixing portion and the second fixing portion are inserted in a press-fit state, 2. The busbar module according to claim 1, wherein the first fixing portion is a press-fit fixing portion that is circumferentially press-fitted into the insertion hole, and the second fixing portion is a press-fit fixing portion that is radially press-fitted into the insertion hole.

3. The busbar module according to claim 2 , wherein a press-fitting and holding force by the first fixing portion is greater than a press-fitting and holding force by the second fixing portion.

4. the bus bar joint portion and the terminal joint portion are joined in a radially abutting state to each other, The busbar module according to claim 2 or 3, wherein the first fixing portion is provided with a protruding portion (122) that protrudes radially away from the relay terminal and abuts against an inner wall of the insertion hole.

5. The busbar holder is provided with a second insertion hole (117) through which the terminal fixing portion of the relay terminal is inserted, The busbar module according to claim 4 , wherein the terminal fixing portion is provided with a protrusion (152) that protrudes radially toward an opposite side of the power line busbar and abuts against an inner wall of the second insertion hole.

6. The power line bus bar has a main body portion (81) extending in a circumferential direction and an arm portion (83) extending in a radial direction from the main body portion, The bus bar holder is formed with a plurality of through holes (113) at positions radially outward of the power line bus bar, the through holes penetrating the bus bar holder in the axial direction and through which conductor ends (36) extending in the axial direction from the phase windings of each phase are inserted, The arm portion is joined to the end of the conductor inserted into the through hole, 4. The busbar module according to claim 2, wherein at least the second fixed portion of the first fixed portion and the second fixed portion is provided with a protrusion (123) that protrudes radially outward and abuts against an inner wall of the insertion hole.

7. In the stator winding, the phase windings of each phase are connected at a neutral point, The bus bar holder holds the power line bus bars of each phase, and holds a neutral point bus bar (72) for connecting a neutral point radially outward of the power line bus bars, The neutral point bus bar has a main body portion (91) extending in a circumferential direction and an arm portion (93) extending in a radial direction from the main body portion, and has a plurality of bus bar fixing portions (92) fixed to the bus bar holder at a plurality of locations on the main body portion spaced apart from each other in the circumferential direction, The busbar holder is formed with a plurality of through holes (113) at positions radially outward of the neutral point busbar, the through holes penetrating the busbar holder in the axial direction and through which conductor ends (36) extending in the axial direction from the phase windings of each phase are inserted, The arm portion of the neutral bus bar is joined to the end portion of the conductor inserted into the through hole, The busbar module according to claim 2 or 3, wherein the busbar fixing portion of the neutral busbar is provided with a protrusion (131) that protrudes radially outward and abuts against an inner wall of the insertion hole.

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