Fixer

Abstract

To suitably wind two phase windings in each of the three consecutive teeth in a circumferential direction.SOLUTION: A stator winding has a plurality of phase windings provided for individual phases, and each phase winding has a plurality of partial windings each wound around the teeth. Among a first tooth, a second tooth, and a third tooth that are three circumferentially consecutive teeth of a plurality of teeth, a partial winding of a first phase winding C1 among the plurality of phase windings is continuously wound on the first tooth and the second tooth, and a partial winding of a second phase winding C2 among the plurality of phase windings is continuously wound on the second tooth and the third tooth. While one end of the first phase winding C1 is led out from a proximal end side or a distal end side of the first tooth, and the other end is led out from a proximal end side or a distal end side of the second tooth, one end of the second phase C2 winding is led out from a proximal end side or a distal end side of the third tooth, and the other end is led out from the proximal end side or the distal end side of the second tooth.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a stator.

Background Art

[0002] In a rotating electric machine including a stator and a rotor, in order to reduce the ripple current in the stator winding provided in the stator, it is conceivable to wind two phase windings having different phases from each other in each of three consecutive teeth in the circumferential direction. For example, in Patent Document 1, in a rotating electric machine having a three-phase stator winding composed of a U phase, a V phase, and a W phase, in the first tooth, each coil body Ua, Va, Wa of the U phase, V phase, and W phase in the first stator winding is wound, in the second tooth, each coil body Ub, Vb, Wb of the U phase, V phase, and W phase in the second stator winding is wound, and in the third tooth, a coil body Uc, Vc, Wc of any one phase of the first and second stator windings is wound. A technique is described in which the phase difference of the magnetomotive force in each coil body between phases is within a predetermined phase range including 20 degrees in electrical angle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Cited Document 1 and the like, a specific configuration for winding phase windings for two phases in each of three consecutive teeth in the circumferential direction is not described. Therefore, a proposal of a technique for winding phase windings for two phases in each of three consecutive teeth in the circumferential direction is desired.

[0005] The present invention has been made in view of the above problems, and its objective is to provide a stator that can suitably wind two phase windings in each of the three consecutive teeth in the circumferential direction. [Means for solving the problem]

[0006] The following describes the means to solve the above problems and their effects.

[0007] Method 1 is, A stator core having an annular back yoke and a plurality of teeth extending radially from the back yoke and provided at predetermined intervals in the circumferential direction, A stator having a stator winding with multiple phase windings provided for each phase, Each of the aforementioned phase windings has a plurality of partial windings that are wound around the teeth by concentrated winding, In the plurality of teeth, of the first, second, and third teeth which are three consecutive teeth in the circumferential direction, the first and second teeth are continuously wound with a portion of the first phase winding among the plurality of phase windings, and the second and third teeth are continuously wound with a portion of the second phase winding among the plurality of phase windings. One end of the first phase winding is drawn out from the base or tip side of the first tooth, and the other end is drawn out from the base or tip side of the second tooth, The second phase winding is characterized in that one end is drawn out from the base or tip side of the third tooth, and the other end is drawn out from the base or tip side of the second tooth.

[0008] For example, in order to reduce ripple current in the stator, it is conceivable to wind two phase windings (first phase winding and second phase winding) that are in different phases around each of the three consecutive teeth in the circumferential direction. Specifically, among the first to third teeth that are three consecutive teeth in the circumferential direction in the stator core, it is conceivable to continuously wind a portion of the first phase winding around the first and second teeth, and continuously wind a portion of the second phase winding around the second and third teeth. In this configuration, one end of the first phase winding is drawn out from the base or tip side of the first tooth, and the other end is drawn out from the base or tip side of the second tooth, while one end of the second phase winding is drawn out from the base or tip side of the third tooth, and the other end is drawn out from the base or tip side of the second tooth. This allows for the connection of the wire ends to the power supply side and the connection of the neutral point in each phase winding to be suitably carried out while treating the three teeth as a set. As a result, two phase windings can be suitably wound around each tooth, which is arranged in a circumferential direction of three consecutive teeth.

[0009] In means 2, the second phase winding is a pre-winding winding that is wound first during winding, and the first phase winding is a post-winding winding that is wound later, and a teeth guide is provided at the axial end of the stator core, radially outward or inward from the teeth, to guide the connecting portion that is spanned between the second teeth and the third teeth in the pre-winding winding.

[0010] When the central second tooth of the three circumferentially continuous first to third teeth is designated as a common tooth, and two phase windings (first phase winding and second phase winding) are wound around this common tooth, there is a concern that the connecting portion between the teeth in the first winding may hinder the winding of the second winding onto the second tooth. In this regard, by providing a tooth-tooth guide portion at the axial end of the stator core, and radially outward or inward from the teeth, it is possible to suppress the inconvenience of the connecting portion between the teeth in the first winding hindering the winding of the second winding.

[0011] In means 3, an insulating member is provided at the axial end of the stator core to insulate the teeth from the partial winding, and the insulating member has an upright portion that extends axially from at least one of the base end side and the tip end side of the teeth, the upright portion functions as a guide between the teeth, and the connecting portion is spanned across the side of the upright portion opposite the teeth.

[0012] An insulating member is provided at the axial end of the stator core to insulate the teeth from the partial windings, and is used to guide the connecting portion between teeth in the pre-winding. This insulating member allows for effective guidance of the connecting portion between teeth while maintaining insulation between the teeth from the partial windings.

[0013] In means 4, in the pre-winding, one side and the other side of the connecting portion guided by the tooth-tooth guide are a partial winding wound around the second tooth and a partial winding wound around the third tooth, respectively, and the circumferential direction of the conductor material in each of these partial windings is opposite to that of the others.

[0014] In the initial winding, if the conductor winding directions of the partial windings wound around the second and third teeth are opposite to each other, it is considered that loosening of the conductor material at the junction is more likely to occur compared to when the conductor winding directions are the same. Furthermore, if loosening of the conductor material at the junction occurs in the initial winding, there is a concern that it may affect the subsequent winding. In this regard, by guiding the junction of the initial winding to the inter-tooth guide section, loosening of the junction is suppressed, and consequently, each phase winding can be wound properly.

[0015] In means 5, an insulating member is provided at the axial end of the stator core to insulate the teeth from the partial winding, and the insulating member is provided on the base end side or tip side of the teeth and has a holding portion that holds the wire ends that are the starting and ending ends of the winding of the respective conductor materials in the first phase winding and the second phase winding.

[0016] The conductor end portions that are the start side and the end side of each conductor in the first-phase winding and the second-phase winding are held by holding portions provided on the base end side or the tip end side of the teeth in the insulating member. Thereby, the positions of the conductor end portions of each phase winding can be properly determined, and connection to a bus bar or the like becomes easy. Also, an effect of suppressing loosening or the like of the conductor during winding operation of each phase winding can be expected.

[0017] In means 6, the stator core is circumferentially divisible and is composed of a plurality of divided cores each having the teeth, and the holding portion is provided for each divided core.

[0018] The stator core is configured by a plurality of divided cores, and a holding portion for holding the conductor end portions of each phase winding is provided for each divided core. In this case, in a configuration where partial windings are wound around each tooth of each divided core, the conductor end portions drawn from the partial windings can be suitably held respectively.

[0019] In means 7, when the number of turns of the partial winding with respect to the first teeth and the third teeth is Na, and the number of turns of the partial winding with respect to the second teeth is Nb, the relationship between these numbers of turns is Na / 2 < Nb.

[0020] When the number of turns of the partial windings of the teeth at both ends (the first and third teeth) among three consecutive teeth in the circumferential direction is Na, and the number of turns of the partial winding of the middle tooth (the second tooth) is Nb, and the relationship between these numbers of turns is Na / 2 < Nb, the amount of conductor increases in the middle tooth, that is, the common tooth, compared to others. Therefore, when winding the conductor around the common tooth, there is a concern that winding disorder may occur. In this regard, since the lead-out positions of the conductor end portions of each phase winding are defined, inconveniences due to winding disorder of the conductor can be suppressed.

[0021] Also, by guiding the crossover portion of the phase winding to the inter-tooth guide portion or holding the conductor end portion by the holding portion, an effect of suppressing inconveniences due to winding disorder of the conductor can be expected.

[0022] In means 8, a bus bar module having a bus bar to which the conductor ends of each phase winding are electrically connected and a bus bar holder for holding the bus bar is provided. The conductor ends, which are one end and the other end of each phase winding, are drawn out so as to extend in the axial direction and are connected to the bus bar while being inserted into an insertion hole provided in the bus bar holder.

[0023] In each phase winding wound around the first to third teeth that are three consecutive in the circumferential direction, the conductor end is configured to be drawn out from the base end side or the tip end side of each tooth. In other words, the conductor end is configured to be drawn out from a predetermined position with respect to each tooth. In this case, the conductor ends of each phase winding can be easily and appropriately connected to the bus bar module provided on one side in the axial direction of the stator core.

[0024] In means 9, the stator core has 3×n of the teeth, and a set of three teeth in the circumferential direction forms a tooth group respectively. The bus bar module has an annular shape coaxial with the stator core, and for each tooth group, two phase windings corresponding to the first phase winding and the second phase winding are wound respectively, and the bus bar module is assembled on one end side in the axial direction of the stator core.

[0025] According to the above configuration, the stator winding can be suitably wound around all 3×n teeth in the stator core, and the bus bar module can be easily and properly assembled for the n tooth groups.

Brief Description of Drawings

[0026] [Figure 1] Longitudinal sectional view of the motor. [Figure 2] Cross-sectional view of the motor. [Figure 3] Diagram showing the electrical configuration of the control device. [Figure 4] Perspective view of the stator. [Figure 5] Plan view of the stator. [Figure 6] A perspective view showing the configuration of the stator core. [Figure 7] Winding diagram of the stator winding. [Figure 8] A diagram showing the correspondence between each section winding of the stator winding and the teeth. [Figure 9] A diagram showing the configuration of the partitioned core. [Figure 10] A perspective view showing a partial winding wound around a single group of teeth. [Figure 11] Perspective view of the busbar module. [Figure 12] A perspective view showing the configuration of the bass bar. [Figure 13] A perspective view showing the configuration of the bus bar holder. [Figure 14] A perspective view showing the busbar module assembled to the stator. [Figure 15] A perspective view showing the state in which a partial winding is wound around the teeth group in the second embodiment. [Figure 16] A plan view of the teeth group as seen from the axial direction. [Figure 17] A diagram illustrating the winding configuration of a stator winding in an alternative example. [Modes for carrying out the invention]

[0027] (First Embodiment) The embodiments will be described below with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the explanations for such parts will be based on those same reference numerals. In the first embodiment, a motor 10 as a rotating electric machine will be described as an example.

[0028] The motor 10 shown in Figure 1 is a permanent magnet field type, specifically a permanent magnet field synchronous machine having three phase windings. In other words, the motor 10 is a brushless motor. It may have two sets of three phase windings. The motor 10 comprises 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. Hereinafter, in this embodiment, axial direction refers to the axial direction of the rotating shaft 11, radial direction refers to the radial direction of the rotating shaft 11, and circumferential direction refers to the circumferential direction of the rotating shaft 11.

[0029] The housing 20 is formed in a cylindrical shape, and the stator 30 and rotor 40 are housed inside the housing 20. The housing 20 is provided with bearings 23 and 24, which rotatably support the rotating shaft 11. The axis of the inner surface of the housing 20 is coaxial with the rotating shaft 11. 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.

[0030] The stator 30 is cylindrical and positioned approximately in the axial center of the housing 20, along the inner circumference of the housing 20. The stator 30 is fixed to the inner surface of the housing 20 with respect to the axis O of the rotation shaft 11. The stator 30 constitutes part of the magnetic circuit and has a ring-shaped stator core 31 arranged radially opposite to the outer circumference of the rotor 40, and stator windings 32 wound around the stator core 31.

[0031] As shown in Figure 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 predetermined distances in the circumferential direction, with slots 35 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 windings 32 are wound around these teeth 34. As a result, the conductors of the stator windings 32 are housed in each slot 35. In this embodiment, the number of teeth 34 and the number of slots 35 are both set to "18". For the sake of explanation, each tooth 34 is assigned the designation T1 to 18 in counterclockwise order in the circumferential arrangement, and when it is necessary to indicate the tooth number, the teeth 34 will also be referred to as teeth T1, T2, T3, etc. The stator windings 32 are held in a state housed in the slots 35, and magnetic flux is generated when power (AC power) is supplied.

[0032] The stator core 31 is formed by stacking multiple thin magnetic steel sheets (core sheets) in the axial direction of the stator core 31. The steel sheets may be formed, for example, by press-punching strip-shaped electrical steel sheets.

[0033] The rotor 40 constitutes part of the magnetic circuit, has multiple magnetic poles in the circumferential direction, and is positioned radially opposite to the stator 30. In this embodiment, the rotor 40 has 14 magnetic poles (i.e., 7 magnetic pole pairs). The rotor 40 comprises a rotor core 41 made of a magnetic material and permanent magnets 42 fixed to the rotor core 41. Specifically, as shown in Figure 2, the rotor 40 has 14 permanent magnets 42 as magnetic parts such that their polarity alternates in the circumferential direction, and the permanent magnets 42 are embedded in housing holes provided in the rotor core 41 along the axial direction.

[0034] The rotor 40 may have a well-known configuration, and may be, for example, an IPM (Interior Permanent Magnet) type rotor or an SPM (Surface Permanent Magnet) type rotor. Alternatively, a rotor on the field winding side may be used as the rotor 40. In this embodiment, an IPM type rotor is used. The rotating shaft 11 is inserted through the rotor 40 and fixed to the rotating shaft 11 so as to rotate integrally with the rotating shaft 11 around the rotating shaft 11.

[0035] A control device 50 is connected to the motor 10. The control device 50 is mainly composed of a microcomputer equipped with a CPU, ROM, RAM, and I / O, and various functions are realized by the CPU executing a program stored in the ROM. These various functions may be realized by hardware electronic circuits, or at least a part of them may be realized by software, i.e., processing executed on a computer.

[0036] The control device 50 has functions such as converting power from an external source (e.g., a battery) and supplying it to the motor 10 to generate driving force. In addition, the control device 50 has a function to control the motor 10 (such as current control) using information about the rotation angle input from the angle sensor 12.

[0037] Figure 3 shows the electrical configuration of the control device 50 in this embodiment.

[0038] In this embodiment, the stator winding 32 is composed of a first stator winding 32a and a second stator winding 32b, and the control device 50 is provided with a first inverter circuit 51 and a second inverter circuit 52 for each of the stator windings 32a and 32b. Each inverter circuit 51 and 52 is composed of a full-bridge circuit having the same number of upper and lower arms as the number of phases in the three-phase system. The control device 50 controls the current in each phase by turning on and off switching elements provided on each arm.

[0039] More specifically, the first inverter circuit 51 comprises three phases, U-phase, V-phase, and W-phase, each equipped with a series connection of an upper arm switch Sp and a lower arm switch Sn as switching elements. In this embodiment, voltage-controlled semiconductor switching elements are used as the upper arm switch Sp and lower arm switch Sn in each phase, specifically IGBTs are used. MOSFETs may also be used. Freewheeling diodes Dp and Dn are connected in antiparallel to the upper arm switch Sp and lower arm switch Sn in each phase, respectively.

[0040] The high-potential side terminal (collector) of each phase's upper arm switch Sp is connected to the positive terminal of the battery. The low-potential side terminal (emitter) of each phase's lower arm switch Sn is connected to the negative terminal (ground) of the battery. The intermediate connection point between each phase's upper arm switch Sp and lower arm switch Sn is connected to one end of the phase winding of each phase in the first stator winding 32a. The first stator winding 32a has U-phase, V-phase, and W-phase windings, and in the first inverter circuit 51, one end of each of these phase windings is connected to the intermediate connection point of the upper and lower arm switches Sp and Sn, respectively.

[0041] The second inverter circuit 52 has the same configuration as the first inverter circuit 51, so a detailed explanation is omitted here. The second stator winding 32b has X-phase, Y-phase, and Z-phase windings, and in the second inverter circuit 52, one end of each of these phase windings is connected to the intermediate connection point of the upper and lower arm switches Sp and Sn, respectively.

[0042] The three-phase current supplied from the first inverter circuit 51 and the three-phase current supplied from the second inverter circuit 52 have a predetermined current phase difference from each other.

[0043] The configuration of the stator 30 is described in detail below. Figure 4 is a perspective view of the stator 30, and Figure 5 is a plan view of the stator 30. Figure 6 is a perspective view showing the configuration of the stator core 31. Note that the stator 30 shown in Figures 4 and 5 corresponds to the stator 30 shown in Figure 2.

[0044] In the stator 30, the stator core 31 is composed of a plurality of segmented cores 61, and the stator core 31 is formed in a cylindrical shape by arranging each segmented core 61 in a circumferential direction. Each segmented core 61 has teeth 34 (see Figure 9(a)), and as each segmented core 61 is arranged in a circumferential direction, the teeth 34 and slots 35 are arranged alternately in the circumferential direction, as shown in Figure 2. In this embodiment, the stator core 31 is composed of 18 segmented cores 61. The stator winding 32 is composed of conductor material wound around each tooth 34 by concentrated winding.

[0045] Figure 7 is a winding configuration diagram of the stator winding 32 in this embodiment. Figure 7(a) shows the configuration of the U-phase, V-phase, and W-phase windings in the first stator winding 32a, and Figure 7(b) shows the configuration of the X-phase, Y-phase, and Z-phase windings in the second stator winding 32b. In these stator windings 32a and 32b, the phase windings of each phase are connected to each other by a star connection (Y connection).

[0046] As shown in Figure 7(a), the first stator winding 32a has partial windings U1, U2, U3, and U4 as U-phase phase windings, partial windings V1, V2, V3, and V4 as V-phase phase windings, and partial windings W1, W2, W3, and W4 as W-phase phase windings. One end of the series connection of partial windings U1 and U2, one end of the series connection of partial windings V1 and V2, and one end of the series connection of partial windings W1 and W2 are connected to each other at the neutral point N1a, and one end of the series connection of partial windings U3 and U4, one end of the series connection of partial windings V3 and V4, and one end of the series connection of partial windings W3 and W4 are connected to each other at the neutral point N1b.

[0047] Furthermore, as shown in Figure 7(b), the second stator winding 32b has partial windings X1, X2, X3, and X4 as X-phase phase windings, partial windings Y1, Y2, Y3, and Y4 as Y-phase phase windings, and partial windings Z1, Z2, Z3, and Z4 as Z-phase phase windings. One end of the series connection of partial windings X1 and X2, one end of the series connection of partial windings Y1 and Y2, and one end of the series connection of partial windings Z1 and Z2 are connected to each other at the neutral point N2a, and one end of the series connection of partial windings X3 and X4, one end of the series connection of partial windings Y3 and Y4, and one end of the series connection of partial windings Z3 and Z4 are connected to each other at the neutral point N2b.

[0048] In addition, the four sub-windings for each phase winding in each stator winding 32a and 32b may be connected in a star configuration, rather than being divided into two pairs and connected in a star configuration as described above. In this case, the neutral points (N1a, N1b) in the first stator winding 32a are combined into one, and similarly, the neutral points (N2a, N2b) in the second stator winding 32b are also combined into one.

[0049] The partial windings U1-U4, V1-V4, and W1-W4 of each phase in the first stator winding 32a, and the partial windings X1-X4, Y1-Y4, and Z1-Z4 of each phase in the second stator winding 32b are each wound around the teeth 34 of the stator core 31 by concentrated winding. 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 explained in detail below.

[0050] In the stator core 31, all 18 teeth 34 are divided into groups of three teeth, and each group of three teeth 34 has partial windings of two phase windings that are in different phases wound around it. In other words, in the stator 30, as shown in Figure 5, all the teeth 34 (T1~T18) of the stator core 31 are divided into six tooth groups G1~G6, and each tooth group G1~G6 has two partial windings from the first stator winding 32a (U1~U4, V1~V4, W1~W4) and two partial windings from the second stator winding 32b (X1~X4, Y1~Y4, Z1~Z4) wound around it. In this case, in each tooth group G1 to G6, a portion of the first stator winding 32a is wound around one of the teeth 34 on both sides in the circumferential direction, and a portion of the second stator winding 32b is wound around the other tooth 34. In addition, both portions of the first and second stator windings 32a and 32b are wound around the central tooth 34 of each tooth group G1 to G6.

[0051] Here, in each tooth group G1 to G6, if we consider the three consecutive teeth 34 in the circumferential direction as the first tooth, second tooth, and third tooth in circumferential order, then of these first to third teeth, the first and second teeth are continuously wound with a portion of the first phase winding from among the multiple phase windings, and the second and third teeth are continuously wound with a portion of the second phase winding from among the multiple phase windings. The second tooth, which is the center of the three consecutive teeth 34, is a common tooth on which both the first and second phase windings are wound. In this case, the "first phase winding" is one of the six phase windings in the first and second stator windings 32a and 32b, and the "second phase winding" is a different phase winding from the first phase winding among the six phase windings.

[0052] Figure 8 shows the correspondence between each partial winding of the stator windings 32a and 32b and each tooth T1 to T18. In Figure 8, for example, in tooth group G1, The first tooth, tooth T1, has a partial winding W1 of the second stator winding 32b wound around it. The second tooth, tooth T2, is wound with a partial winding W2 of the second stator winding 32b and a partial winding X2 of the first stator winding 32a. The third tooth, tooth T3, has a partial winding X1 of the first stator winding 32a wound around it. The other tooth groups G2 to G6 will not be explained, but each partial winding is wound in a similar manner, and each partial winding is wound around the first to third teeth of each tooth group G2 to G6 as shown in the figure.

[0053] The winding structure of each partial winding in each tooth group will be described below. Before describing the winding structure of each partial winding, a more detailed configuration of the stator core 31 will be described.

[0054] Figure 9(a) is a perspective view of the segmented core 61, and Figure 9(b) is an exploded perspective view of the segmented core 61. The segmented core 61 has a core body 62 which is a laminate of steel plates, and insulating members 63 and 64 provided on one axial end and the other end (upper and lower sides in the figure) of the core body 62. The core body 62 has teeth 34 extending in the radial direction (radial direction in the stator core 31), a yoke portion 62a provided on one end, and a flange portion 62b provided on the other end. The yoke portion 62a corresponds to the back yoke 33 of the stator core 31 shown in Figure 2. When multiple segmented cores 61 are arranged in a circumferential direction, the yoke portions 62a of each segmented core 61 are connected to each other to form an annular back yoke 33. It is preferable that the yoke portions 62a of adjacent segmented cores 61 are joined together by adhesive or the like.

[0055] The insulating members 63 and 64 are made of an insulating resin material or the like and are attached to both axial ends of the teeth 34, respectively. The insulating member 63 has a cover portion 63a that fits over the axial end face (upper surface in the figure) of the teeth 34, and upright portions 63b and 63c provided on one radial end and the other end of the cover portion 63a, extending axially (upwards in the figure). The upright portion 63b is provided on the side of the yoke portion 62a in the radial direction, i.e., on the base end side of the teeth 34, and the upright portion 63c is provided on the side opposite the yoke portion in the radial direction, i.e., on the tip side of the teeth 34. The upright portion 63b has grooves 65a and 65b in two locations in the circumferential direction through which the conductor material of the partial winding can be inserted. The insulating member 64 similarly has a cover portion 64a and upright portions 64b and 64c.

[0056] The divided core 61 is constructed by attaching insulating members 63 and 64 to the core body 62, and by winding multiple layers of conductor material across each insulating member 63 and 64, a partial winding is wound around the teeth 34 of the divided core 61.

[0057] Figure 10 is a perspective view showing a state in which partial windings are wound around a single tooth group G, where (a) is a perspective view seen from the radially inward direction and (b) is a perspective view seen from the radially outward direction. In Figures 10(a) and (b), tooth group G1 including teeth T1 to T3 is used as an example, and in tooth group G1, the phase winding wound around teeth T1 and T2 (W-phase phase winding having partial windings W1 and W2) is called the "first phase winding C1", and the phase winding wound around teeth T2 and T3 (X-phase phase winding having partial windings X1 and X2) is called the "second phase winding C2". Of the two phase windings C1 and C2, the second phase winding C2 is the pre-winding winding that is wound first during winding, and the first phase winding C1 is the post-winding winding that is wound later.

[0058] In the second phase winding C2, which is the pre-winding winding, the conductor material is wound in the order of teeth T3 → teeth T2 during the winding process. At each of these teeth T2 and T3, the conductor material is wound in opposite circumferential directions. In Figure 10(a), the conductor material is wound counterclockwise around tooth T3 with a number of turns Na, and then the conductor material is wound clockwise around tooth T2 with a number of turns Nb. In addition, in the second phase winding C2, the conductor end at the beginning of winding and the conductor end at the end of winding are pulled out in the axial direction, forming lead-out sections H21 and H22 that extend from the divided core 61 for a predetermined length.

[0059] The lead-out portion H21 on the winding start side is pulled out from the base end side of tooth T3 (third tooth), and the lead-out portion H22 on the winding end side is pulled out from the base end side of tooth T2 (second tooth). In particular, in each divided core 61, grooves 65a, 65b are provided in the upright portion 63b of the insulating member 63, and the lead-out portion H21 is pulled out while inserted into the groove 65a of the insulating member 63 corresponding to tooth T3. Similarly, the lead-out portion H22 is pulled out while inserted into the groove 65a of the insulating member 63 corresponding to tooth T2. The lead-out portions H21 and H22 are held by the grooves 65a of the insulating member 63, and these grooves 65a correspond to the "holding portion".

[0060] Furthermore, in the second phase winding C2, the section between the partial winding X1 wound around tooth T3 and the partial winding X2 wound around tooth T2 is a connecting section H23 that spans between these teeth T3 and T2, and this connecting section H23 is guided to the outside of the upright section 63b of the insulating member 63. Specifically, the connecting section H23 is a conductor material in the section from the end position of the tooth winding of partial winding X1 to the start position of the tooth winding of partial winding X2, and this connecting section H23 is pulled out to the outside of the upright section 63b between the groove section 65b on the tooth T3 side and the groove section 65b on the tooth T2 side. As shown in Figure 10(b), a guide groove 65c is provided on the outer surface of the upright section 63b, and the connecting section H23 is guided while incorporated into the guide groove 65c. The upright section 63b of the insulating member 63 corresponds to the "tooth guide section".

[0061] On the other hand, in the first phase winding C1, which is a post-winding winding, the conductor material is wound in the order of teeth T1 → teeth T2 during the winding process. Comparing the first and second phase windings C1 and C2, in each of these phase windings C1 and C2, the winding process is carried out in the circumferential direction in opposite orders, from one adjacent tooth to the other. In other words, in the second phase winding C2, which is a pre-winding winding, the partial windings X1 and X2 are wound in a manner that progresses from left to right in Figure 10(a), whereas in the first phase winding C1, which is a post-winding winding, the partial windings W1 and W2 are wound in a manner that progresses from right to left in Figure 10(a).

[0062] In each tooth T1 and T2, the conductor material is wound in opposite circumferential directions. In Figure 10(a), the conductor material is wound counterclockwise around tooth T1 with a number of turns Na, and then wound clockwise around tooth T2 with a number of turns Nb. In the first phase winding C1, the conductor end on the winding start side and the conductor end on the winding end side are pulled out axially, forming lead-out sections H11 and H12 that extend from the divided core 61 for a predetermined length.

[0063] The lead-out portion H11 on the winding start side is drawn out from the base end side of the tooth T1 (first tooth), and the lead-out portion H12 on the winding end side is drawn out from the base end side of the tooth T2 (second tooth). In particular, in this case, the lead-out portion H11 is drawn out in a state of being inserted into the groove portion 65a of the insulating member 63 corresponding to the tooth T1. Further, the lead-out portion H12 is drawn out in a state of being inserted into the groove portion 65b of the insulating member 63 corresponding to the tooth T2.

[0064] Also, in the first-phase winding C1, between the partial winding W1 wound around the tooth T1 and the partial winding W2 wound around the tooth T2, there is a bridging portion H13 bridged between these teeth T1 and T2. The bridging portion H13, unlike the bridging portion H23 of the second-phase winding C2, is not guided outside the upright portion 63b of the insulating member 63 and is directly bridged from the tooth T1 side to the tooth T2 side.

[0065] According to the above configuration, the two lead-out portions H11 and H12 of the first-phase winding C1 and the two lead-out portions H21 and H22 of the second-phase winding C2 are arranged to be aligned in the circumferential direction at the same position in the radial direction (that is, the position on the base end side of each tooth). Each of the other tooth groups G2 to G6 has the same winding structure as the tooth group G1 (see FIGS. 4 and 5).

[0066] As described above, in the first-phase winding C1, the number of turns of the partial winding around the tooth T1 is "Na", and the number of turns of the partial winding around the tooth T2 is "Nb". Also, in the second-phase winding C2, the number of turns of the partial winding around the tooth T3 is "Na", and the number of turns of the partial winding around the tooth T2 is "Nb". The relationship between these numbers of turns is Na / 2 < Nb. That is, in the present embodiment, among the three consecutive teeth T1 to T3 in the circumferential direction, the numbers of turns of the teeth T1 and T3 at both ends are each "Na", and the number of turns of the central tooth T2 is "2Nb", and their relationship is "Na < 2Nb". The upper limit of the number of turns Nb is, for example, the number of turns Na.

[0067] In this case, since the amount of conductor in the central tooth T2 (common tooth) of the three consecutive teeth T1 to T3 is greater than the amount of conductor in the teeth T1 and T3 at both ends, there is a concern that winding disorder may occur when winding the conductor material around the common tooth. In this embodiment, however, the exit position of the conductor end of each phase winding is defined, the connecting portion H23 of the second phase winding C2 (pre-winding) is guided by the upright portion 63b of the insulating member 63, and the conductor end is held by the groove portion 65a of the insulating member 63, thereby suppressing the inconvenience caused by winding disorder of the conductor material.

[0068] Furthermore, in this embodiment, the busbar module 70 is assembled to one axial end of the stator 30, and the details thereof will be described below. Figure 11 is a perspective view of the busbar module 70.

[0069] The busbar module 70 has a plurality of busbars 71 and a busbar holder 72 that holds each of the busbars 71. The busbars 71 include a busbar 73 for each phase provided for each phase of each stator winding 32a, 32b, and a neutral point busbar 74. The busbars 73 for each phase are conductive members that connect the partial windings of the same phase to each other, and the busbar 74 for the neutral point is a conductive member that connects the partial windings of each phase by a star connection. In this embodiment, six busbars are provided as the busbars 73 for each phase: a U-phase busbar, a V-phase busbar, a W-phase busbar, an X-phase busbar, a Y-phase busbar, and a Z-phase busbar, and two busbars are provided as the neutral point busbars 74: a neutral point busbar for the first stator winding 32a and a neutral point busbar for the second stator winding 32b. In this example, we are illustrating a configuration in which each stator winding 32a and 32b has one neutral point.

[0070] Figure 12(a) is a perspective view showing the configuration of one busbar 73 for each phase. Each phase busbar 73 is arc-shaped overall, with radially extending arm portions 73a at both ends, and winding connection portions 73b connected to the phase windings of each phase at the tip of each arm portion 73a. Power terminal portions 73c for power input and output are also provided in the arc portion for each phase. As shown in Figure 11, the radial length of the arm portion 73a and the circumferential position of the power terminal portion 73c differ for each phase busbar 73.

[0071] Figure 12(b) is a perspective view showing the configuration of a single busbar 74 for the neutral point. The busbar 74 for the neutral point is arc-shaped overall, and has radially extending arm portions 74a at multiple locations (six locations in this embodiment) along its longitudinal direction. At the tip of each arm portion 74a, there is a neutral point connection portion 74b that is connected to the neutral point end of the phase winding of each phase.

[0072] Figure 13 is a perspective view showing the configuration of the busbar holder 72. The busbar holder 72 is made of, for example, an insulating resin material and is formed in an annular shape. The busbar holder 72 has a plurality of grooves 72a that extend in an arc shape in the circumferential direction. These plurality of grooves 72a are formed in multiple layers radially inward and outward, and each busbar 73, 74 is assembled into each groove 72a such that the busbar plate surfaces face each other radially. In addition, a plurality of protrusions 72b are provided on the upper surface of the busbar holder 72. These protrusions 72b are support parts that support the arm portions 73a, 74a of each busbar 73, 74, and are provided distributed in the circumferential direction according to the position of each arm portion 73a, 74a.

[0073] Multiple through holes 72c are provided on the outer edge of the busbar holder 72, i.e., radially outward from each groove 72a, that penetrate in the axial direction (up and down direction in the figure). These through holes 72c are insertion holes through which the lead-out portions, which are the wire ends of each phase winding, i.e., the lead-out portions H11, H12, H21, and H22 shown in Figure 10(a), etc., are inserted. In this embodiment, the through holes 72c, which are the wire connection portions in the busbar module 70, are concentrated on the outer edge of the busbar holder 72. The busbar holder 72 is also provided with multiple assembly portions 72d for assembling the busbar module 70 to the stator core 31.

[0074] Figure 14 is a perspective view showing the busbar module 70 assembled on the stator 30. In Figure 14, the busbar module 70 is assembled coaxially with the stator core 31 on one axial end of the stator core 31.

[0075] The lead-out ends of each phase winding are inserted through the through-holes 72c of the busbar holder 72 and connected to the respective busbars 73 and 74 on the upper surface of the busbar holder 72. Specifically, the lead-out ends of each phase winding and the connection portions 73b and 74b of the respective busbars 73 and 74 are joined by welding or the like. This ensures that the phase windings of each phase are connected to each other in the desired configuration in each stator winding 32a and 32b. In addition, power lines 75 are connected to the power terminal portions 73c of each phase busbar 73.

[0076] Incidentally, noise and vibration due to torque ripple are problematic in rotating electric machines. Since torque ripple mainly consists of 6th harmonic or 12th harmonic components, it is desirable to suppress these. Therefore, it is preferable to use the motor 10 with the above configuration and perform the following control in the control device 50.

[0077] In the motor 10 with the above configuration, The first teeth (T1, T4, T7, T10, T13, T16) of each tooth group are wound with the U-phase, V-phase, and W-phase partial windings (first coil body) of the first stator winding 32a. • On the second teeth (T2, T5, T8, T10, T14, T17) of each tooth group, a partial winding (second coil body) of either one phase from the first and second stator windings 32a and 32b is wound. The third teeth (T3, T6, T9, T12, T15, T18) of each tooth group are wound with the X-phase, Y-phase, and Z-phase partial windings (third coil body) of the second stator winding 32b.

[0078] In this configuration, the control device 50 sets the 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, such that the phase difference between the magnetomotive force of the second coil body of each phase and the phase difference between the magnetomotive force of the third coil body of each phase and the magnetomotive force generated by 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 generated by the partial winding of the second coil body of each phase and the magnetomotive force generated by the partial winding of the second stator winding 32b wound around the second teeth are within a predetermined phase range including 20 degrees in electrical angle. Alternatively, the control device 50 sets the combined phase difference between the current flowing through the partial winding of the first stator winding 32a wound around the second tooth and the current flowing through the partial winding of the second stator winding 32b wound around the second tooth. Details of this control are described in detail in Japanese Patent No. 7103299 filed by the applicant of this application.

[0079] According to the embodiment described in detail above, the following excellent effects can be obtained.

[0080] In the stator core 31, of the three consecutive first to third teeth in the circumferential direction, the first phase winding C1 is continuously wound around the first and second teeth, and the second phase winding C2 is continuously wound around the second and third teeth. In this configuration, one end of the first phase winding C1 is drawn out from the base end of the first tooth and the other end is drawn out from the base end of the second tooth, while one end of the second phase winding C2 is drawn out from the base end of the third tooth and the other end is drawn out from the base end of the second tooth (see Figures 10(a) and (b)). This allows for the connection of the conductor ends to the power supply side and the connection of the neutral point in each phase winding to be suitably carried out while treating the three teeth 34 as a set. As a result, two phase windings can be suitably wound around each of the three consecutive teeth 34 in the circumferential direction.

[0081] When the central second tooth of the three circumferentially continuous first to third teeth is designated as a common tooth, and two phase windings (first phase winding C1 and second phase winding C2) are wound around this common tooth, there is a concern that the connecting portion between the teeth in the first winding may interfere with the winding of the second winding. In this regard, by providing an upright portion 63b (tooth guide portion) at the axial end of the stator core 31 and radially outward from the teeth 34 to guide the connecting portion H23 of the first winding, it is possible to suppress the inconvenience of the connecting portion H23 between the teeth 34 in the first winding interfering with the winding of the second winding.

[0082] An insulating member 63 is provided at the axial end of the stator core 31 (split core 61) and insulates the teeth 34 from the partial winding to guide the connecting portion H23 between the teeth in the pre-winding. This insulating member 63 allows for suitable guidance of the connecting portion H23 between the teeth while achieving insulation between the teeth 34 from the partial winding.

[0083] In the second phase winding C2 (pre-winding), if the conductor winding directions of the partial windings wound around the second and third teeth are opposite to each other, it is considered that loosening of the conductor material at the connecting section H23 is more likely to occur compared to when the winding directions are the same. In other words, when the conductor material is wound in opposite directions on adjacent teeth, the tension on the connecting section H23 is weakened, which can cause loosening. Furthermore, if loosening of the conductor material at the connecting section H23 in the second phase winding C2 occurs, there is a concern that it may affect the first phase winding C1 (post-winding). In this regard, by guiding the connecting section H23 of the second phase winding C2 to the upright portion 63b of the insulating member 63, loosening of the connecting section is suppressed, and consequently, each phase winding can be wound properly.

[0084] The lead-out portions H11, H12, H21, and H22 (the wire ends at the beginning and end of the winding) of the first phase winding C1 and the second phase winding C2 are held in place by the grooves 65a of the insulating member 63. This allows for proper positioning of the wire ends of each phase winding C1 and C2, facilitating connection to busbars and the like. Furthermore, it is expected to suppress loosening of the wire material during the winding work of each phase winding.

[0085] The stator core 31 is composed of a plurality of segmented cores 61, and each segmented core 61 is provided with a holding portion (groove 65a) for holding the wire ends of each phase winding C1 and C2. In this configuration, when a partial winding is wound around each tooth 34 of each segmented core 61, the wire ends drawn out from the partial winding can be appropriately held.

[0086] Among three consecutive teeth 34 in the circumferential direction, the number of turns of the partial windings of the teeth 34 (the first and third teeth) at both ends is Na, and the number of turns of the partial winding of the central tooth 34 (the second tooth) is Nb. When the relationship between these numbers of turns is Na / 2 < Nb, the amount of conductor increases compared to others in the central tooth 34, that is, the common tooth. Therefore, when winding the conductor around the common tooth, there is a concern that winding disorder may occur. In this regard, since the lead-out positions of the conductor ends (lead-out portions H11, H12, H21, H22) of each phase winding are defined, it is possible to suppress the inconvenience caused by the winding disorder of the conductor.

[0087] Also, by guiding the crossing portion H23 of the second-phase winding C2 to the upright portion 63b of the insulating member 63 or holding the conductor end by the groove portion 65a of the insulating member 63, it is possible to expect the effect of suppressing the inconvenience caused by the winding disorder of the conductor.

[0088] In each phase winding C1, C2 wound around the first to third teeth that are continuous in the circumferential direction, the conductor ends are drawn out from the base end side of each tooth 34. In other words, the conductor ends are drawn out from a predetermined position with respect to each tooth 34. In this case, the conductor ends of each phase winding C1, C2 can be easily and appropriately connected to the bus bar module 70 provided on one side in the axial direction of the stator core 31.

[0089] The total 18 teeth 34 in the stator core 31 are divided into six tooth groups G1 to G6, and two phase windings C1, C2 are wound in each of these tooth groups G1 to G6, and an annular bus bar module 70 is assembled. As a result, the stator winding 32 can be suitably wound around all the teeth, and the bus bar module 70 can be easily and properly assembled to the partial windings of each tooth group G1 to G6.

[0090] (Second Embodiment) The second embodiment will be described below, focusing on the differences from the first embodiment. In this embodiment, compared to the first embodiment, the winding patterns of the first phase winding C1 and the second phase winding C2 in each tooth group G consisting of three consecutive teeth 34 in the circumferential direction are different, and the specific configuration will be described below.

[0091] Figure 15 is a perspective view showing the state in which the partial winding is wound around the teeth group G1, and Figure 16 is a plan view of the teeth group G1 as seen from the axial direction. In this embodiment, two different phase windings C1 and C2 are wound continuously during the winding process, and Figure 15 shows the state in which the two phase windings C1 and C2 are connected by an intermediate section H3. In this embodiment as in the first embodiment, the second phase winding C2 is the pre-winding winding and the first phase winding C1 is the post-winding winding.

[0092] In the configuration shown in Figure 15, during the winding process of the conductor material, the conductor material corresponding to the second phase winding C2 (pre-winding) is wound in the order of teeth T3 → teeth T2, and subsequently, the conductor material corresponding to the first phase winding C1 (post-winding) is wound in the order of teeth T2 → teeth T1. In the winding portion corresponding to C1, the section between teeth T1 and T2 is a connecting section H41, and in the winding portion corresponding to C2, the section between teeth T2 and T3 is a connecting section H42.

[0093] In this case, a partial winding X1 with turn count Na is wound around tooth T3, then passes through the connecting section H42, and a partial winding X2 with turn count Nb is wound around tooth T2. After the intermediate section H3 is stretched axially, a partial winding W2 with turn count Nb is wound around tooth T2, then passes through the connecting section H41, and a partial winding W1 with turn count Na is wound around tooth T1. Note that in Figure 15, the winding direction of teeth T1 and T3 is counterclockwise, and the winding direction of tooth T2 is clockwise.

[0094] In the winding section corresponding to C1, the lead-out section H11 and the connecting section H41 should be inserted into the grooves 65a and 65b of the insulating member 63, respectively. Similarly, in the winding section corresponding to C2, the lead-out section H21 and the connecting section H42 should be inserted into the grooves 65a and 65b of the insulating member 63, respectively.

[0095] Figure 16 shows the state after the winding has been formed as in Figure 15, by cutting the intermediate section H3 to separate the first phase winding C1 and the second phase winding C2 from each other. In this case, the cutting of the intermediate section H3 forms lead-out sections H51 and H52, which become the conductor ends of each phase winding C1 and C2. In the configuration of Figure 16, two lead-out sections H11 and H21 are provided on the radially outward side (tooth base end side), and two lead-out sections H51 and H52 are provided on the radially inward side (tooth tip side), and each of these lead-out sections is extended in the axial direction. In the busbar holder 72 of the busbar module 70, through holes 72c are preferably formed to match the position of each lead-out section.

[0096] According to this embodiment, in each group of teeth, it is possible to continuously wind two phase windings C1 and C2 around three teeth, thereby improving the efficiency of the winding work. Furthermore, by distributing the four lead-out sections H11, H21, H51, and H52 in two groups each on the radially inward and outward, the spacing between welding positions can be increased, for example, when welding each busbar 73 and 74 in the busbar module 70, thereby simplifying the welding work.

[0097] (Other embodiments) The above embodiment may be modified as follows, for example.

[0098] In the above embodiment, the second phase winding C2, which is the pre-winding winding, is configured to wind a portion of the winding in the order of the third tooth → second tooth. However, this can be changed to wind a portion of the winding in the order of the second tooth → third tooth. Also, in the above embodiment, the first phase winding C1, which is the post-winding winding, is configured to wind a portion of the winding in the order of the first tooth → second tooth. However, this can be changed to wind a portion of the winding in the order of the second tooth → first tooth.

[0099] In the configuration shown in Figures 10(a) and (b), one end and the other end of each phase winding C1 and C2 may be drawn out from the tip side of each tooth 34, that is, from the side opposite the back yoke of each tooth 34. In this case, the radially inward upright portion 63c of the insulating member 63 (see Figure 9(a)) is preferably the tooth guide portion. In other words, the connecting portion H23 that spans between adjacent teeth in the second phase winding C2 (pre-winding) is preferably guided to the outside (radially inward) by the upright portion 63b of the insulating member 63.

[0100] Alternatively, in a configuration where two phase windings are wound around three consecutive first to third teeth in the circumferential direction, one end of each phase winding is drawn out from the base end side (back yoke side) of each tooth, and the other end is drawn out from the tip side (anti-back yoke side) of each tooth.

[0101] In the above embodiment, as shown in Figure 7(a), the first stator winding 32a is configured such that the partial windings U1~U4, V1~V4, and W1~W4 of each phase are divided into two and connected by a star configuration. However, this configuration may be changed. For example, as shown in Figure 17(a), the partial windings U1~U4, V1~V4, and W1~W4 of each phase may be connected in series, and these three-phase series connections may be connected by a star configuration. Similarly, for the second stator winding 32b, as shown in Figure 17(b), the partial windings X1~X4, Y1~Y4, and Z1~Z4 of each phase may be connected in series, and these three-phase series connections may be connected by a star configuration.

[0102] In each stator winding 32a and 32b, it is also possible to connect the phase windings of each phase using a delta connection instead of a star connection (Y connection).

[0103] In the stator core 31, each segmented core 61 may have multiple teeth 34. For example, a segmented core 61 may have three teeth 34. Alternatively, the stator core 31 may have a configuration that is not a segmented core structure, i.e., a single, indivisible annular structure in the circumferential direction.

[0104] The number of teeth of the stator core 31 may be other than 18. However, in this case, the number of teeth should preferably be 3 × n.

[0105] In the above embodiment, the stator winding 32 has a configuration having a first stator winding 32a and a second stator winding 32b, for a total of 6 phase windings. However, this can be changed to a configuration where the stator winding 32 has 3 phase windings.

[0106] The rotating electric machine may be an outer rotor type instead of an inner rotor type.

[0107] The technical concepts extracted from the above-described embodiments are described below. [Configuration 1] A stator core (31) having an annular back yoke (33) and a plurality of teeth (34) extending radially from the back yoke and provided at predetermined intervals in the circumferential direction, A stator (30) having a stator winding (32) having multiple phase windings provided for each phase, Each of the aforementioned phase windings has a plurality of partial windings that are wound around the teeth by concentrated winding, In the plurality of teeth, of the first, second, and third teeth which are three consecutive teeth in the circumferential direction, the first and second teeth are continuously wound with a portion of the first phase winding (C1) of the plurality of phase windings, and the second and third teeth are continuously wound with a portion of the second phase winding (C2) of the plurality of phase windings. One end of the first phase winding is drawn out from the base or tip side of the first tooth, and the other end is drawn out from the base or tip side of the second tooth, A stator in which one end of the second phase winding is drawn out from the base or tip side of the third tooth, and the other end is drawn out from the base or tip side of the second tooth. [Configuration 2] Of the first phase winding and the second phase winding, the second phase winding is a pre-winding winding that is wound first during winding, and the first phase winding is a post-winding winding that is wound later. The stator according to configuration 1, wherein at the axial end of the stator core, and radially outward or inward from the teeth, there is a tooth-tooth guide portion (63b) that guides a connecting portion (H23) that is stretched between the second teeth and the third teeth in the pre-winding. [Configuration 3] An insulating member (63) is provided at the axial end of the stator core to insulate the teeth from the partial winding. The stator according to configuration 2, wherein the insulating member has upright portions (63b, 63c) provided to extend axially on at least one of the base end and tip end of the teeth, the upright portions function as guides between the teeth, and the connecting portion is spanned across the side of the upright portions opposite the teeth. [Structure 4] The stator according to configuration 2 or 3, wherein in the pre-winding, one side and the other side of the connecting portion guided by the inter-tooth guide are a partial winding wound around the second tooth and a partial winding wound around the third tooth, respectively, and the circumferential direction of the conductor material of each of these partial windings is opposite to that of the other. [Composition 5] An insulating member (63) for insulating the teeth and the partial winding is provided at an axial end of the stator core. The insulating member is provided on the base end side or the tip end side of the teeth, and has holding portions (65a, 65b) for holding the conductor end portions which are the start side and the end side of winding of each conductor material in the first-phase winding and the second-phase winding. The stator according to any one of Configurations 1 to 4. [Configuration 6] The stator core is circumferentially divisible, and is composed of a plurality of divided cores (61) each having the teeth. The holding portion is provided for each divided core. The stator according to Configuration 5. [Configuration 7] When the number of turns of the partial winding with respect to the first teeth and the third teeth is Na, and the number of turns of the partial winding with respect to the second teeth is Nb, the relationship between the respective numbers of turns is Na / 2 < Nb. The stator according to any one of Configurations 1 to 6. [Configuration 8] A busbar module (70) having busbars (73, 74) to which the conductor end portions of each phase winding are electrically connected, and a busbar holder (72) for holding the busbars. The conductor end portions which are one end and the other end of each phase winding are drawn out so as to extend in the axial direction, and are connected to the busbars in a state of being inserted into insertion holes (72c) provided in the busbar holder. The stator according to any one of Configurations 1 to 7. [Configuration 9] The stator core has 3×n teeth, and three teeth in a group in the circumferential direction are respectively tooth groups (G1 to G6). The busbar module has an annular shape coaxial with the stator core. For each tooth group, two phase windings corresponding to the first-phase winding and the second-phase winding are wound. The busbar module is assembled on one axial end side of the stator core. The stator according to Configuration 8.

Explanation of Signs

[0108] 30...stator, 31...stator core, 32...stator winding, 33...back yoke, 34...teeth.

Claims

1. A stator core (31) having an annular back yoke (33) and a plurality of teeth (34) extending radially from the back yoke and provided at predetermined intervals in the circumferential direction, A stator (30) having a stator winding (32) having a plurality of phase windings provided for each phase, Each of the aforementioned phase windings has a plurality of partial windings that are wound around the teeth by concentrated winding, In the plurality of teeth, of the first, second, and third teeth which are three consecutive teeth in the circumferential direction, the first and second teeth are continuously wound with a portion of the first phase winding (C1) of the plurality of phase windings, and the second and third teeth are continuously wound with a portion of the second phase winding (C2) of the plurality of phase windings. One end of the first phase winding is drawn out from the base or tip side of the first tooth, and the other end is drawn out from the base or tip side of the second tooth, A stator in which one end of the second phase winding is drawn out from the base or tip side of the third tooth, and the other end is drawn out from the base or tip side of the second tooth.

2. Of the first phase winding and the second phase winding, the second phase winding is a pre-winding winding that is wound first during winding, and the first phase winding is a post-winding winding that is wound later. The stator according to claim 1, wherein at the axial end of the stator core, and radially outward or inward from the teeth, there is a tooth-tooth guide portion (63b) that guides a connecting portion (H23) that is stretched between the second teeth and the third teeth in the pre-winding.

3. An insulating member (63) is provided at the axial end of the stator core to insulate the teeth from the partial winding. The stator according to claim 2, wherein the insulating member has upright portions (63b, 63c) provided to extend axially on at least one of the base end side and the tip end side of the teeth, the upright portions function as guides between the teeth, and the connecting portion is spanned across the side of the upright portions opposite the teeth.

4. The stator according to claim 2, wherein in the pre-winding, one side and the other side of the connecting portion guided by the inter-tooth guide are a partial winding wound around the second tooth and a partial winding wound around the third tooth, respectively, and the circumferential direction of the conductor material of each of these partial windings is opposite to that of the others.

5. An insulating member (63) is provided at the axial end of the stator core to insulate the teeth from the partial winding. The stator according to claim 1, wherein the insulating member is provided on the base end side or tip side of the teeth and has holding portions (65a, 65b) that hold the wire ends that are the starting and ending ends of the wire material in the first phase winding and the second phase winding, respectively.

6. The stator according to claim 5, wherein the stator core is circumferentially separable and is composed of a plurality of divided cores (61), each having the teeth, and each divided core is provided with the holding portion.

7. The stator according to any one of claims 1 to 6, wherein when the number of turns of the partial winding for the first tooth and the third tooth is Na, and the number of turns of the partial winding for the second tooth is Nb, the relationship between these numbers of turns is Na / 2 < Nb.

8. The busbar module (70) includes busbars (73, 74) to which the conductor ends of each phase winding are electrically connected, and a busbar holder (72) that holds the busbars. The stator according to claim 1, wherein the conductor ends, which are one and the other end of each phase winding, are drawn out so as to extend in the axial direction and connected to the busbar by being inserted through holes (72c) provided in the busbar holder.

9. The stator core has 3 × n teeth, and the three teeth in the circumferential direction each form a tooth group (G1 to G6). The busbar module has an annular shape coaxial with the stator core, Each of the aforementioned tooth groups has two phase windings, corresponding to the first phase winding and the second phase winding, wound around it. The stator according to claim 8, wherein the busbar module is assembled to one axial end of the stator core.

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