Stator

Abstract

A first winding (101) and a second winding (102), which are mutually out-of-phase, are wound as stator windings on predetermined teeth of a stator core (31). The first winding is a winding wound first with respect to the teeth, and the second winding is a winding wound later with respect to the teeth. In the teeth around which the first winding and the second winding are wound, the first winding is wound in a first range from a first end portion on one side in the radial direction to an intermediate position in the radial direction in such a manner that the wire material overlaps multiple layers with respect to the teeth. The second winding is wound in a second range from a second end portion on the other side in the radial direction to a position overlapping the first winding. The first winding is wound with a winding start end and a winding end of the wire material as positions on the first end side, and the second winding is wound so that a part of the winding start end and the winding end of the wire material is laminated on the first winding.

Description

[0001] Cross-reference to related applications

[0002] This application is based on Japanese patent application No. 2022-178136 filed on November 7, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a stator. Background Art

[0004] In a rotating electric machine having a stator and a rotor, a structure in which a stator winding is wound around a tooth of a stator core by concentrated winding is known. In addition, a structure in which two phase windings of different phases are wound around the same tooth of a stator core is known. For example, Patent Document 1 describes a structure in which two phase windings of different phases are respectively wound around one area and the other area of ​​a tooth divided into two in the radial direction.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 5304427

[0008] However, in the structure in which two phase windings are wound in each region of the tooth divided into two in the radial direction as described above, the wire ends of each phase winding provided in these phase windings are separated and exist in the radial inner side and the radial outer side, and there is a concern that the terminal processing of connecting the wire ends to each other at the coil end or connecting each wire end to a connecting member such as a bus bar may become complicated. In addition, in the structure assuming that the two phase windings are wound in a state of being stacked on each other, when the two phase windings are wound on the same tooth, there is a concern that the winding wound later will interfere with the wire end led out from the winding wound earlier. Summary of the invention

[0009] In view of the above, an object of the present disclosure is to provide a stator capable of appropriately winding a first winding and a second winding on the same tooth.

[0010] The following describes the technical means for solving the above-mentioned technical problems and their effects.

[0011] Means 1 is a stator,

[0012] The stator has a stator core and a multi-phase stator winding. The stator core has a circular annular back yoke and a plurality of teeth extending radially from the back yoke and arranged at predetermined intervals in the circumferential direction. The stator winding is formed by winding a conductive wire material around the teeth in a concentrated winding manner.

[0013] A first winding and a second winding having different phases from each other are wound around a predetermined tooth among the plurality of teeth as the stator winding, wherein the first winding is wound first with respect to the tooth, and the second winding is wound later with respect to the tooth.

[0014] In the tooth on which the first winding and the second winding are wound, the first winding is wound in a first range from a first end on one radial side to a middle position in a radial direction so that the conductive wire material overlaps the tooth in multiple layers, and the second winding is wound in a second range from a second end on the other radial side to a position overlapping with the first winding,

[0015] The first winding is wound with the winding start end and the winding end end of the conductive wire material as positions on the first end side, and the second winding is wound so as to partially overlap the first winding.

[0016] In a structure in which a first winding and a second winding of mutually out-of-phase as stator windings are wound on the same tooth of a stator core, the terminal processing (terminal processing at the coil end) of these windings may be complicated. In addition, when winding the windings in a stacked state, the winding start end and the winding end end of the first winding wound first may become obstacles when the second winding wound later is wound. In this regard, in the tooth wound with the first winding and the second winding, the first winding is wound in a first range from the first end on one side in the radial direction to the middle position in the radial direction by overlapping the conductive wire material with multiple layers relative to the tooth, thereby enabling the first winding to be arranged close to the radial one side of the tooth, and further enabling the ends of the conductive wire material in the first winding (the winding start end and the winding end end) to be appropriately concentrated on the first end side of the tooth. As a result, it is possible to suppress the undesirable situation that the winding start end and the winding end end of the first winding wound first become obstacles when the second winding wound later is wound. In addition, by winding the second winding in the tooth in the second range from the second end on the other radial side to the position overlapping with the first winding, the second winding can be wound close to the first end in a state overlapping with the first winding using the empty area in the tooth where the first winding is not wound. As a result, the end of the conductive wire material can be brought close to the first end for the second winding. As a result, the first winding and the second winding can be appropriately wound in the same tooth.

[0017] In means 2, the first winding is wound with the first end as the winding starting position and the position where the wire material overlaps with the winding starting position as the winding ending position, and the second winding is wound from the winding starting position toward the center of the tooth at a position closer to the center of the tooth between the radial ends of the tooth than the winding starting position of the first winding.

[0018] According to the above structure, the first winding is wound with the first end of the tooth as the winding starting point and the position overlapping the conductive wire material at the winding starting point as the winding ending point, thereby realizing a structure suitable for arranging the first winding close to one side of the tooth in the radial direction. In addition, the winding starting point of the second winding is set to a position closer to the center of the tooth between the radial ends of the tooth than the winding starting point of the first winding, and the winding is performed toward the center of the tooth, so that the second winding can be appropriately wound while avoiding interference with the end of the first winding.

[0019] In means 3, the conductor material is a round wire with a circular cross-section, the first winding and the second winding are wound on the teeth in a staggered arrangement of the conductor material, and the second winding is wound at a position with an interval from the first end corresponding to one winding circle of the conductor material as the winding starting position.

[0020] In a structure using round wire as a conductor material, the first winding and the second winding are wound in a staggered configuration, which can improve the occupancy rate. In addition, through the staggered configuration structure of the round wire, it is relatively easy to use a position that is offset from the radial position as the winding starting point of the second winding, and the second winding can appropriately avoid interference with the end of the first winding.

[0021] In means 4, in the tooth, the second winding starts from the first end side and is folded back at the second end, whereby the conductive wire material is wound in a multi-layered manner with respect to the tooth.

[0022] According to the above structure, for each of the first winding and the second winding, the winding start point and the winding end point of the conductor material can be concentrated on the first end side of the tooth. This can improve the operability of the terminal processing when connecting a plurality of first windings constituting the stator winding to each other, connecting a plurality of second windings to each other, or connecting a first winding and a second winding to each other.

[0023] In means 5, in the tooth, a protrusion is provided at a boundary position opposite to the first end side in the first range around which the first winding is wound, and the protrusion extends in a direction perpendicular to the radial direction and away from the tooth surface.

[0024] As described above, when the conductive wire material is wound around the first winding in multiple layers in the first range from the first end to the middle position of the tooth in the radial direction, there is a possibility that the conductive wire material will be scattered due to the displacement of the conductive wire material at the middle position of the tooth. In this regard, in the tooth, since the protrusion is provided at the boundary position (the boundary portion on the middle position side) of the first range where the first winding is wound, it is possible to suppress the scattering of the first winding.

[0025] In means 6, in the tooth, an insulating component is installed at the axial end of the tooth, and the first winding and the second winding are wound in a state where the insulating component is interposed between the first winding and the second winding and the tooth. The axial thickness dimensions of the insulating component are different between the first insulating portion and the second insulating portion, the axial thickness dimension of the first insulating portion is smaller than the axial thickness dimension of the second insulating portion, the first insulating portion is a portion corresponding to the first range in the radial direction, and the second insulating portion is a portion outside the first range.

[0026] In the insulating member mounted on the axial end of the tooth, the thickness dimension in the axial direction is different between the first insulating portion corresponding to the first range and the second insulating portion outside the first range, and the thickness dimension in the axial direction of the first insulating portion is smaller than the thickness dimension in the axial direction of the second insulating portion. In this case, the first insulating portion and the second insulating portion can have a step difference, and the first winding can be suppressed from being scattered by the step difference.

[0027] In addition, in the first range of the tooth, both the first winding and the second winding are wound in a stacked state, whereas only the second winding is wound in the portion outside the first range. In this structure, since the axial thickness dimension of the first insulating portion corresponding to the first range is smaller than the axial thickness dimension of the second insulating portion, it is possible to suppress the axial length dimension in the first range from being too large compared to other portions, and to achieve equalization of the axial length dimension of the winding in the radial direction of the tooth.

[0028] In means 7, the stator winding has a plurality of phase windings arranged in phase, and each of the phase windings is wound around the teeth in a concentrated winding manner.

[0029] In the stator core, when three teeth that are continuous in the circumferential direction are set as a first tooth, a second tooth, and a third tooth, a first phase winding among the plurality of phase windings is continuously wound around the first tooth and the second tooth, and a second phase winding among the plurality of phase windings is continuously wound around the second tooth and the third tooth, and the second tooth is a tooth around which the first winding and the second winding are wound.

[0030] One end and the other end of the first phase winding are respectively drawn out from the end portions on the back yoke side of the radial ends of the first tooth and the second tooth, and on the other hand,

[0031] One end and the other end of the second phase winding are respectively drawn out from the end portions on the back yoke side of the radial ends of the third tooth and the second tooth,

[0032] In the first phase winding and the second phase winding, the first phase winding is the leading winding that is wound first when the winding is wound, and the second phase winding is the trailing winding that is wound later, and the first phase winding is continuous between the first tooth and the second tooth through a transition portion, and the transition portion extends circumferentially along the back yoke.

[0033] In order to achieve, for example, the reduction of pulsating current in the stator, it is considered that two phase windings (first phase winding and second phase winding) of mutually different phases are wound in each of three teeth that are continuous in the circumferential direction. Specifically, in the stator core, it is considered that the first tooth and the second tooth of the three teeth that are continuous in the circumferential direction are continuously wound with the first phase winding, and the second tooth and the third tooth are continuously wound with the second phase winding. Then, in this structure, one end and the other end of the first phase winding are respectively drawn out from the end of the back yoke side of the radial ends of the first tooth and the second tooth, and on the other hand, one end and the other end of the second phase winding are respectively drawn out from the end of the back yoke side of the radial ends of the third tooth and the second tooth. As a result, it is possible to properly connect the wire ends in each phase winding to the power supply side and the neutral point while treating the three teeth as a group. In addition, since the first phase winding as the first winding group is continuous between the first tooth and the second tooth through the transition portion extending in the circumferential direction along the back yoke, it becomes a structure in which all the multiple wire ends generated in units of teeth are processed on the back yoke side.

[0034] In means 8, an insulating component is provided at the axial end of the stator core, which insulates the teeth and the stator winding, and the insulating component has a rising portion, which is provided on the back yoke side of the tooth in an axially extending manner, and a retaining portion is provided on the rising portion, which retains the transition portion which is one of the ends of the winding starting point end and the winding ending point end of the first winding wound on the second tooth and the other of the winding starting point end and the winding ending point end of the first winding.

[0035] In a structure in which the first phase winding is continuously wound relative to the first tooth and the second tooth, in the first winding wound on the second tooth in the first phase winding, the transition portion extending from the first tooth side becomes the winding starting end, and the opposite side becomes the winding ending end. Or conversely, the transition portion extending from the first tooth side becomes the winding ending end, and the opposite side becomes the winding starting end. In this case, the rising portion provided on the back yoke side is used in the insulating component to hold the winding starting end and the winding ending end of the first winding. Thereby, the winding starting end and the winding ending end of the first winding can be held on the back yoke side, and it is appropriately avoided to become an obstacle when the second winding is wound. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above-mentioned objects and other objects, features or advantages of the present disclosure will become more apparent through the following detailed description with reference to the accompanying drawings. The accompanying drawings are as follows:

[0037] Figure 1 is a longitudinal section view of the motor.

[0038] Figure 2 is a cross-sectional view of the motor.

[0039] Figure 3 is a diagram showing the electrical structure of the control device,

[0040] Figure 4 is a three-dimensional diagram of the stator.

[0041] Figure 5 is a top view of the stator.

[0042] Figure 6 is a three-dimensional diagram showing the structure of a stator core.

[0043] Figure 7 is the winding structure diagram of the stator winding,

[0044] Figure 8 It is a diagram showing the correspondence between the various winding parts of the stator winding and the teeth.

[0045] Fig. 9 is a diagram showing the structure of a split core,

[0046] Fig.10 is a perspective view showing a state where a partial winding is wound around one tooth group.

[0047] Fig.11 1 is a diagram showing the winding order of the conductor material on the tooth A2 at the center of the tooth group.

[0048] Fig.12 is a three-dimensional diagram showing the winding structure in tooth A2,

[0049] Fig.13 is a three-dimensional diagram of the bus assembly.

[0050] Fig.14 is a three-dimensional diagram showing the structure of a bus.

[0051] Fig.15 is a perspective view showing the structure of a bus holder.

[0052] Fig.16 This is a perspective view showing the state where the bus assembly is assembled to the stator.

[0053] Fig.17 FIG. 1 is a diagram showing a state where a winding is wound around a tooth in another example.

[0054] Fig.18 FIG. 1 is a diagram showing a state where a winding is wound around a tooth in another example.

[0055] Fig.19 FIG. 1 is a diagram showing a state where a winding is wound around a tooth in another example.

[0056] Fig. 20 This is a winding structure diagram of a stator winding in another example. DETAILED DESCRIPTION

[0057] (First Embodiment)

[0058] Hereinafter, each embodiment will be described based on 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 parts with the same reference numerals is referred to. In the first embodiment, a motor 10 as a rotating electrical machine is exemplified and described.

[0059] Figure 1 The motor 10 shown is a permanent magnet excitation type motor, specifically, a permanent magnet excitation type synchronous machine having a three-phase winding. That is, the motor 10 is a brushless motor. The three-phase winding may have 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. Hereinafter, in this embodiment, the axial direction indicates the axial direction of the rotating shaft 11, the radial direction indicates the radial direction of the rotating shaft 11, and the circumferential direction indicates the circumferential direction of the rotating shaft 11.

[0060] The housing 20 is formed in a cylindrical shape, and the stator 30 and the rotor 40 are housed in the housing 20. The housing 20 is provided with bearings 23 and 24, and the rotating shaft 11 is supported to be rotatable by the bearings 23 and 24. The axis of the inner peripheral surface of the housing 20 is coaxial with the rotating shaft 11. The angle sensor 12 is provided on the front end side of the rotating shaft 11. The angle sensor 12 can be a magnetic sensor or a resolver.

[0061] The stator 30 is provided in a cylindrical shape along the inner circumference of the housing 20 at the substantially axial center of the housing 20. The stator 30 is fixed to the inner circumferential surface of the housing 20 with the axis O of the rotating shaft 11 as the center. The stator 30 constitutes a part of the magnetic circuit, and has a stator core 31 and a stator winding 32. The stator core 31 is annular and arranged radially opposite to the outer circumference of the rotor 40. The stator winding 32 is wound around the stator core 31.

[0062] like Figure 2As shown, the stator core 31 has an annular back yoke 33 and a plurality of teeth 34 protruding radially inward from the back yoke 33 and arranged at a predetermined distance in the circumferential direction, and slots 35 are formed between adjacent teeth 34. In the stator core 31, the teeth 34 are arranged at equal intervals in the circumferential direction, and the stator winding 32 is wound around these teeth 34. Thus, the conductor of the stator winding 32 is accommodated in each slot 35. In the present embodiment, the number of teeth 34 and the number of slots 35 are respectively set to "18". For the sake of convenience, symbols T1 to 18 are marked for each tooth 34 in reverse order of circumferential arrangement. When it is necessary to indicate the tooth number, the tooth 34 is also recorded as teeth T1, T2, T3... The stator winding 32 is maintained in a state of being accommodated in the slots 35, and a magnetic flux is generated by being supplied with power (alternating current).

[0063] The stator core 31 is formed by laminating a plurality of thin plate-shaped magnetic steel plates (stator core sheets) in the axial direction of the stator core 31. The steel plates may be formed by, for example, punching a strip-shaped electromagnetic steel plate.

[0064] The rotor 40 constitutes a part of the magnetic circuit, has a plurality of magnetic poles in the circumferential direction, and is arranged to face the stator 30 in the radial direction. In the present embodiment, the rotor 40 has fourteen magnetic poles (i.e., the number of magnetic pole pairs is seven). The rotor 40 includes a rotor core 41 formed of a magnetic body and a permanent magnet 42 fixed to the rotor core 41. Specifically, as shown in FIG. Figure 2 As shown, the rotor 40 includes fourteen permanent magnets 42 as magnet portions so that polarities thereof alternate in the circumferential direction. The permanent magnets 42 are embedded in accommodation holes provided in the rotor core 41 along the axial direction.

[0065] The rotor 40 may be a well-known structure, for example, an IPM type (Interior Permanent Magnet) rotor or an SPM type (Surface Permanent Magnet) rotor. In addition, a rotor on the field winding side may be used as the rotor 40. In the present embodiment, an IPM type rotor is used. The rotating shaft 11 is inserted through the rotor 40, and the rotor 40 is fixed to the rotating shaft 11 in such a manner that the rotor 40 rotates integrally with the rotating shaft 11 with the rotating shaft 11 as the center.

[0066] The motor 10 is connected to the control device 50. The control device 50 is mainly composed of a microcomputer including a CPU, a ROM, a RAM, and an I / O, and the CPU implements various functions by executing programs stored in the ROM. In addition, various functions may be implemented by electronic circuits as hardware, or at least part of various functions may be implemented by software, that is, processing executed on a computer.

[0067] The control device 50 may include, for example, a function of converting power from an external source (e.g., a battery) and supplying the power to the motor 10 to generate a driving force. In addition, for example, the control device 50 may include a function of controlling the motor 10 (e.g., controlling a current) using information on a rotation angle input from the angle sensor 12.

[0068] Figure 3 2 is a diagram showing an electrical configuration of the control device 50 in the present embodiment.

[0069] In the present embodiment, the stator winding 32 is composed of a first stator winding 32a and a second stator winding 32b, and a first inverter circuit 51 and a second inverter circuit 52 are provided for each of the stator windings 32a and 32b in the control device 50. Each of the inverter circuits 51 and 52 is respectively composed of a full-bridge circuit having the same number of upper and lower arms as the number of phases of the three phases. The control device 50 controls the current of each phase by turning on and off the switching element provided in each arm.

[0070] In detail, the first inverter circuit 51 has a series connection of an upper arm switch Sp and a lower arm switch Sn as a switching element in each of the three phases formed by the U phase, the V phase, and the W phase. In the present embodiment, a voltage-controlled semiconductor switching element, specifically an IGBT, is used as the upper arm switch Sp and the lower arm switch Sn of each phase. In addition, a MOSFET can also be used. Freewheel diodes (return diodes) Dp and Dn are respectively connected in reverse parallel to the upper arm switch Sp and the lower arm switch Sn of each phase.

[0071] The high potential side terminal (collector) of the upper arm switch Sp of each phase is connected to the positive terminal of the battery. In addition, the low potential side terminal (emitter) of the lower arm switch Sn of each phase is connected to the negative terminal (ground) of the battery. The intermediate connection point between the upper arm switch Sp and the lower arm switch Sn of each phase is respectively 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. In the first inverter circuit 51, one end of the phase winding of each phase is respectively connected to the intermediate connection point of the switches Sp and Sn of the upper and lower arms.

[0072] The second inverter circuit 52 has the same structure as the first inverter circuit 51, so detailed description is omitted here. The second stator winding 32b has phase windings of X phase, Y phase, and Z phase. In the second inverter circuit 52, one end of the phase winding of each phase is connected to the middle connection point of the switches Sp and Sn of the upper and lower arms, respectively.

[0073] 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 with each other.

[0074] The structure of the stator 30 will be described in detail below. Figure 4 is a three-dimensional diagram of the stator 30, Figure 5 is a top view of the stator 30. In addition, Figure 6 3 is a perspective view of the structure of the stator core 31. Figure 4 , Figure 5 The stator 30 shown corresponds to Figure 2 The stator 30 is shown.

[0075] In the stator 30, the stator core 31 is composed of a plurality of split cores 61. The split cores 61 are arranged in a circumferential direction, so that the stator core 31 is formed into a cylindrical shape. Each split core 61 has teeth 34 (see Fig. 9 (a)), each split core 61 is arranged in the circumferential direction, thereby, as shown in FIG. Figure 2 As shown, the teeth 34 and the slots 35 are alternately arranged in the circumferential direction. In the present embodiment, the stator core 31 is composed of eighteen split cores 61. A round wire having a circular cross section is used as a conductor material, and the conductor material is wound around each tooth 34 in a concentrated winding manner, thereby forming the stator winding 32.

[0076] Figure 7 is a winding structure diagram of the stator winding 32 in this embodiment, Figure 7 (a) shows the structure of the phase windings of the U phase, the V phase, and the W phase in the first stator winding 32a, Figure 7 (b) shows the structure of the phase windings of the second stator winding 32b, namely, the X-phase, the Y-phase, and the Z-phase. The phase windings of the stator windings 32a and 32b are connected to each other by star connection (Y connection).

[0077] like Figure 7 As shown in (a), the first stator winding 32a has partial windings U1, U2, U3, and U4 as phase windings of the U phase, partial windings V1, V2, V3, and V4 as phase windings of the V phase, and partial windings W1, W2, W3, and W4 as phase windings of the W phase. Moreover, one end of the series connection body of the partial windings U1 and U2, one end of the series connection body of the partial windings V1 and V2, and one end of the series connection body of the partial windings W1 and W2 are mutually connected through a neutral point N1a, and one end of the series connection body of the partial windings U3 and U4, one end of the series connection body of the partial windings V3 and V4, and one end of the series connection body of the partial windings W3 and W4 are mutually connected through a neutral point N1b.

[0078] In addition, if Figure 7As shown in (b), the second stator winding 32b has partial windings X1, X2, X3, and X4 as phase windings of the X phase, partial windings Y1, Y2, Y3, and Y4 as phase windings of the Y phase, and partial windings Z1, Z2, Z3, and Z4 as phase windings of the Z phase. Moreover, one end of the series connection body of the partial windings X1 and X2, one end of the series connection body of the partial windings Y1 and Y2, and one end of the series connection body of the partial windings Z1 and Z2 are mutually connected through a neutral point N2a, and one end of the series connection body of the partial windings X3 and X4, one end of the series connection body of the partial windings Y3 and Y4, and one end of the series connection body of the partial windings Z3 and Z4 are mutually connected through a neutral point N2b.

[0079] In addition, in addition to the structure in which the four partial windings of each phase winding in each stator winding 32a, 32b are separated into two and connected in star connection as described above, the four partial windings of each phase winding may be connected in star connection after two parallel connections. In this case, in the first stator winding 32a, the neutral points (N1a, N1b) are combined into one, and in the second stator winding 32b, the neutral points (N2a, N2b) are also combined into one.

[0080] 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 respectively wound around the teeth 34 of the stator core 31 in a concentrated winding manner. In the present embodiment, twelve partial windings of the first stator winding 32a and twelve partial windings of the second stator winding 32b are allocated to be wound around the eighteen teeth 34 of the stator core 31. This point will be described in detail below.

[0081] In the stator core 31, all eighteen teeth 34 are divided into groups of three, and the three teeth 34 in each group are respectively wound with partial windings of two phase windings that are out of phase with each other. Figure 5As shown, all teeth 34 (T1 to T18) of the stator core 31 are divided into six tooth groups G1 to G6, and two partial windings of the partial windings U1 to U4, V1 to V4, and W1 to W4 of the first stator winding 32a and two partial windings of the partial windings X1 to X4, Y1 to Y4, and Z1 to Z4 of the second stator winding 32b are wound around each tooth group G1 to G6 in a distributed state. In this case, in each tooth group G1 to G6, a partial winding of the first stator winding 32a is wound around one side of each tooth 34 that is both sides in the circumferential direction, and a partial winding of the second stator winding 32b is wound around the other side of each tooth 34. In addition, partial windings of both the first stator winding 32a and the second stator winding 32b are wound around the tooth 34 that is the center of each tooth group G1 to G6.

[0082] Here, in each tooth group G1 to G6, when three teeth 34 that are continuous in the circumferential direction are set as the first tooth, the second tooth, and the third tooth in the order of circumferential arrangement, the first tooth and the second tooth among these first to third teeth are continuously wound with a partial winding of the first phase winding among a plurality of phase windings, and the second tooth and the third tooth are continuously wound with a partial winding of the second phase winding among a plurality of phase windings. The second tooth in the middle of the three continuous teeth 34 becomes a common tooth that is wound with the first phase winding and the second phase winding together. In this case, the "first phase winding" is any one of the six phase windings of the first stator winding 32a and the second stator winding 32b, and the "second phase winding" is a phase winding different from the first phase winding among the same six phase windings.

[0083] Figure 8 : is a diagram showing the correspondence between each partial winding of the stator windings 32a, 32b and each tooth T1 to T18. Figure 8 For example, in gear group G1,

[0084] A partial winding W1 of the second stator winding 32b is wound around the tooth T1.

[0085] The partial winding W2 of the second stator winding 32b and the partial winding X2 of the first stator winding 32a are wound around the tooth T2.

[0086] The partial winding X1 of the first stator winding 32a is wound around the tooth T3. The teeth T1 to T3 correspond to the first to third teeth. Although the other tooth groups G2 to G6 are not described, the partial windings are wound around them in the same manner, and the three teeth in each tooth group G2 to G6 correspond to the first to third teeth, respectively.

[0087] Hereinafter, the winding structure of each partial winding in each tooth group will be described. In addition, here, before describing the winding structure of each partial winding, a more detailed structure of the stator core 31 will be described.

[0088] Fig. 9 (a) is a three-dimensional view of the split core 61, Fig. 9 (b) is an exploded perspective view of the split core 61. The split core 61 has a core body 62 as a steel plate laminate and insulating components 63 and 64 provided at one axial end and the other axial end of the core body 62 (the upper and lower sides of the figure). The core body 62 has teeth 34 extending in the radial direction (the radial direction in the stator core 31), a yoke 62a provided at one end of the core body 62, and a flange 62b provided at the other end. The yoke 62a is equivalent to Figure 2 The back yoke 33 of the stator core 31 is shown in FIG. When the plurality of split cores 61 are arranged in a circumferential direction, the yokes 62a of the split cores 61 are connected to each other, thereby forming an annular back yoke 33. In addition, in adjacent split cores 61, the yokes 62a are bonded to each other by bonding or the like.

[0089] The insulating members 63 and 64 are made of insulating resin materials and the like, and are respectively attached to both ends of the tooth 34 in the axial direction. The insulating member 63 has a covering portion 63a and rising portions 63b and 63c. The covering portion 63a covers the axial end surface (upper surface in the figure) of the tooth 34, and the rising portions 63b and 63c are provided at one end side and the other end side of the covering portion 63a in the radial direction and extend in the axial direction (upper side in the figure). The rising portion 63b is provided on the yoke 62a side in the radial direction, that is, the base end side of the tooth 34, and the rising portion 63c is provided on the side opposite to the yoke in the radial direction, that is, the front end side of the tooth 34. In the rising portion 63b, grooves 65a and 65b are provided at two locations in the circumferential direction, through which the conductor material of a partial winding can be inserted. The insulating member 64 also has a covering portion 64a and rising portions 64b and 64c.

[0090] The split core 61 is formed by attaching insulating members 63 and 64 to a core body 62 , and a plurality of conductive wires are wound so as to be suspended over the insulating members 63 and 64 , thereby winding partial windings around the teeth 34 of the split core 61 .

[0091] Fig.10 1 and 2 are perspective views showing a state where a partial winding is wound around one tooth group G, wherein (a) is a perspective view viewed from the radial inner side, and (b) is a perspective view viewed from the radial outer side.

[0092] exist Fig.10 In (a) and (b), in the tooth group G, three teeth 34 that are consecutive in the circumferential direction are arranged in the order of tooth A1 (first tooth), tooth A2 (second tooth), and tooth A3 (third tooth) in the circumferential direction, and the first phase winding C1 is wound continuously on teeth A1 and A2, and the second phase winding C2 is wound continuously on teeth A2 and A3. The center tooth A2 among teeth A1 to A3 is a common tooth that is wound with the first phase winding C1 and the second phase winding C2. In addition, Fig.10 The tooth group G shown in (a) and (b) is, for example, Figure 2 or Figure 8 In the tooth group G1 shown in the figure, the tooth T1 of the tooth group G1 is equivalent to the "tooth A3", the tooth T2 is equivalent to the "tooth A2", and the tooth T3 is equivalent to the "tooth A1". Fig.10 In (a) and (b), partial windings X1 and X2 as the first phase winding C1 are wound around teeth A1 and A2, and partial windings W1 and W2 as the second phase winding C2 are wound around teeth A2 and A3. The first phase winding C1 of each phase winding C1 and C2 is the first winding that is wound first during winding, and the second phase winding C2 is the last winding that is wound last.

[0093] In the first phase winding C1 as the first winding group, the conductor material is wound in the order of tooth A1 → tooth A2 during the winding operation. In each of the teeth A1 and A2, the conductor material is wound in the circumferential directions opposite to each other. Fig.10 For example, in (a), the conductor material is wound counterclockwise around the tooth A1 for the number of turns Na, and then the conductor material is wound clockwise around the tooth A2 for the number of turns Nb. In the first phase winding C1, the conductor end portions at the winding start point side and the conductor end portions at the winding end point side of the conductor material are drawn out in the axial direction to form drawn out portions H11 and H12 extending from the split core 61 by a predetermined length.

[0094] The drawn portion H11 on the winding start side is drawn from the base end side (back yoke 33 side) of the tooth A1, and the drawn portion H12 on the winding end side is drawn from the base end side (back yoke 33 side) of the tooth A2. In this case, in particular, in each split core 61, the grooves 65a, 65b are provided in the rising portion 63b of the insulating member 63, and the drawn portion H11 is drawn in a state of being inserted into the groove 65a of the insulating member 63 corresponding to the tooth A1. In addition, the drawn portion H12 is drawn in a state of being inserted into the groove 65a of the insulating member 63 corresponding to the tooth A2.

[0095] In addition, in the first phase winding C1, between the partial winding X1 wound on the tooth A1 and the partial winding X2 wound on the tooth A2, a transition portion H13 is formed between the teeth A1 and A2, and the transition portion H13 is guided to the outside of the rising portion 63b of the insulating member 63. Specifically, the transition portion H13 is the conductor material in the section from the tooth winding end position of the partial winding X1 to the tooth winding start position of the partial winding X2, and the transition portion H13 is pulled out to the outside of the rising portion 63b between the groove portion 65b on the tooth A1 side and the groove portion 65b on the tooth A2 side. In addition, as Fig.10 As shown in (b), a guide groove 65c is provided on the outer side surface of the rising portion 63b, and the transition portion H13 can be guided in a state of being fitted into the guide groove 65c.

[0096] On the other hand, in the second phase winding C2 as the last winding group, the wire material is wound in the order of tooth A3 → tooth A2. Here, if compared with the first phase winding C1 and the second phase winding C2, in these phase windings C1 and C2, the winding operation is performed from the adjacent teeth on one side to the teeth on the other side in the circumferential direction in the reverse order. That is, in the first phase winding C1 as the first winding group, the winding operation is performed from the adjacent teeth on the other side in the reverse order. Fig.10 The partial windings X1 and X2 are wound in a manner that the left direction of (a) is transferred to the right direction. On the other hand, in the second phase winding C2 as the rear winding, the windings X1 and X2 are wound in a manner that the left direction of (a) is transferred to the right direction. Fig.10 The partial windings W1 and W2 are wound in a manner shifting from the right to the left in (a).

[0097] In each tooth A2, A3, the conductor material is wound in opposite circumferential directions. Fig.10 For example, in (a), the conductor material is wound counterclockwise around the tooth A3 by the number of turns Na, and then the conductor material is wound clockwise around the tooth A2 by the number of turns Nb. In the second phase winding C2, the conductor end portions at the winding start point side and the conductor end portions at the winding end point side of the conductor material are drawn out in the axial direction to form drawn out portions H21 and H22 extending from the split core 61 by a predetermined length.

[0098] The drawn portion H21 on the winding start side is drawn from the base end side (back yoke 33 side) of the tooth A3, and the drawn portion H22 on the winding end side is drawn from the base end side (back yoke 33 side) of the tooth A2. In this case, the drawn portion H21 is drawn in a state of being inserted into the groove portion 65a of the insulating member 63 corresponding to the tooth A3. In addition, the drawn portion H22 is drawn in a state of being inserted into the groove portion 65b of the insulating member 63 corresponding to the tooth A2.

[0099] In addition, in the second phase winding C2, a transition portion H23 is formed between the partial winding W1 wound on the tooth A3 and the partial winding W2 wound on the tooth A2, which is spanned between these teeth A2 and A3. The transition portion H23 is different from the transition portion H13 of the first phase winding C1. It is not guided to the outside of the rising portion 63b of the insulating part 63, but is directly spanned from the tooth A3 side to the tooth A2 side.

[0100] According to the above structure, the two extraction parts H11, H12 of the first phase winding C1 and the two extraction parts H21, H22 of the second phase winding C2 are arranged in the circumferential direction at the same position in the radial direction (that is, the position on the base end side of each tooth). Figure 2 Each of the tooth groups G1 to G6 shown in the figure has the same winding structure.

[0101] As described above, in the first-phase winding C1, the number of turns of a part of the winding with respect to tooth A1 is "Na", and the number of turns of a part of the winding with respect to tooth A2 is "Nb". Additionally, in the second-phase winding C2, the number of turns of a part of the winding with respect to tooth A3 is "Na", and the number of turns of a part of the winding with respect to tooth A2 is "Nb". The relationship between these respective numbers of turns is Na / 2 < Nb. That is, in the present embodiment, for the teeth A1 and A3 at both ends among the three teeth A1 to A3 that are continuous in the circumferential direction, the number of turns is "Na" respectively, and for the central tooth A2, the number of turns 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.

[0102] In this case, the amount of wire of the central tooth A2 (common tooth) among the three continuous teeth A1 to A3 is more than that of the teeth A1 and A3 at both ends. Therefore, when winding the wire material around the common tooth, winding disorder may occur. Regarding this point, in the present embodiment, the lead-out positions of the wire ends of each phase winding are specified. The transition portion H13 of the first-phase winding C1 (the winding first) is guided by the erected portion 63b of the insulating member 63, and the wire end is held by the groove portion 65a of the insulating member 63. Through these, the occurrence of defects due to winding disorder of the wire material is suppressed.

[0103] As described above, in the winding structure in which a plurality of windings are wound around the same tooth of the stator core 31, the terminal processing of each winding (terminal processing at the end of the coil) becomes complicated, and the winding start end and the winding end of the winding first wound may become an obstacle when winding the subsequent windings. In the present embodiment, it is a winding structure that improves such defects, and the details are described below.

[0104] Fig.11 It is a diagram showing the winding order of the wire material in the central tooth A2 of the tooth group G. Here, the part of the winding of the first-phase winding C1 wound around the tooth A2 is set as the first winding 101, and the part of the winding of the second-phase winding C2 wound around the tooth A2 is set as the second winding 102. For the sake of explanation, the first winding 101 is represented by a single-layer coil, and the second winding 102 is represented by a double-layer coil. In Fig.10 (a), the numbers marked on each of the windings 101 and 102 represent the winding order. Each of the windings 101 and 102 is wound with the illustrated No. 1 as the winding start point and No. 8 as the winding end point. The number of turns is not limited to this. The left and right of the figure are in the circumferential direction. Additionally, the up and down of the figure are in the radial direction, and the upper side of the figure is the back yoke 33 side, that is, the radial outer side (outer diameter side). Fig.11 (b) shows the state in which the first winding 101 is wound around the tooth A2 (tooth 34), Fig.11 (c) shows the state in which the second winding 102 is wound after the first winding 101.

[0105] As Fig.11 As shown, in the tooth 34, the first winding 101 is wound in a state where the conductive wire material is overlapped in multiple layers within the first range R1 from the end (first end 34a) on the back yoke 33 side to the middle position in the radial direction. In this case, the first winding 101 is wound with the first end 34a of the tooth 34 as the winding starting point position (single-layer turn No. 1) and the position overlapping the conductive wire material at the winding starting point position as the winding end point position (single-layer turn No. 8). As a result, the first winding 101 is arranged close to the radial one side of the tooth 34, and the ends of the conductive wire material in the first winding 101 (winding starting point end and winding end end end) are concentrated on the first end side of the tooth 34.

[0106] In addition, the position closer to the radial center of the tooth 34 than the winding starting point position of the first winding 101 is set as the winding starting point position (double-layer coil No. 1), and the second winding 102 is wound from the winding starting point position toward the center of the tooth, and the second winding 102 is wound in a manner that a part overlaps on the first winding 101. That is, the second winding 102 is wound in the second range R2 from the end (second end 34b) opposite to the back yoke side of the tooth 34 to the position overlapping with the first winding 101, and the conductive wire material is wound in multiple layers with respect to the tooth 34 by setting the first end 34a side as the winding starting point and folding back at the second end 34b.

[0107] Here, the first winding 101 and the second winding 102 are wound around the teeth 34 in a staggered arrangement of the conductor material as a round wire, and the second winding 102 is wound at a position that is separated from the first end by an interval equivalent to one winding of the conductor material as the winding starting point. In addition, if the radial inner side and the radial outer side are compared, the number of turns of the conductor material on the radial outer side (back yoke 33 side) is larger. However, the number of turns of the conductor material on the radial inner side and the radial outer side may be set to be the same.

[0108] According to the above configuration, the winding start and end ends of the first winding 101 are concentrated on the first end side of the tooth 34, thereby preventing the winding start and end ends of the first winding 101 from becoming obstacles when winding the second winding 102.

[0109] Fig.12 : is a three-dimensional diagram showing the winding structure in tooth A2. Fig.12 As shown, the first winding 101 is wound in a state where the transition portion H13 and the extraction portion H12 are respectively held by the groove portions 65a and 65b of the insulating member 63. Furthermore, the second winding 102 is wound in a manner overlapping the first winding 101. In this case, the groove portions 65a and 65b of the insulating member 63 correspond to the holding portions that hold the transition portion H13 and the extraction portion H12 of the first winding 101.

[0110] Hereinafter, the bus bar assembly 70 assembled to one axial end side of the stator 30 will be described. Fig.13 is a perspective view of the bus assembly 70 .

[0111] The bus assembly 70 has a plurality of bus bars 71 and a bus bar holder 72 for holding the bus bars 71. The bus bars 71 include bus bars 73 for each phase and bus bars 74 for a neutral point, which are provided for each phase of each stator winding 32a, 32b. The bus bars 73 for each phase are conductive components that interconnect partial windings of the same phase, and the bus bars 74 for a neutral point are conductive components that connect partial windings of each phase through a star connection. In the present embodiment, six bus bars, namely, a U-phase bus, a V-phase bus, a W-phase bus, an X-phase bus, a Y-phase bus, and a Z-phase bus, are provided as the bus bars 73 for each phase, and two bus bars, namely, a neutral point bus of the first stator winding 32a and a neutral point bus of the second stator winding 32b, are provided as the bus bars 74 for a neutral point. In addition, a structure in which one neutral point is provided in each stator winding 32a, 32b is exemplified here.

[0112] Fig.14 (a) is a three-dimensional diagram of the structure of a bus as a bus 73 for each phase. The bus 73 for each phase is in an arc shape as a whole, and arms 73a extending in the radial direction are provided at both ends, and a winding connection part 73b connected to the phase winding of each phase is provided at the front end of each arm 73a. In addition, an electric terminal part 73c for inputting and outputting electric power according to the phase is provided in the arc part. Fig.13 As shown, in the bus bar 73 of each phase, the radial length of each arm portion 73a and the circumferential position of the electric terminal portion 73c are different.

[0113] in addition, Fig.14 (b) is a perspective view of the structure of a bus serving as a neutral point bus 74. The neutral point bus 74 is in an arc shape as a whole, and radially extending arms 74a are provided at multiple locations (six locations in the present embodiment) in the longitudinal direction thereof, and a neutral point connection portion 74b connected to the neutral point side end of the phase winding of each phase is provided at the front end of each arm portion 74a.

[0114] Fig.15It is a three-dimensional view of the structure of the bus holder 72. The bus holder 72 is made of, for example, an insulating resin material and is formed into a circular ring shape. The bus holder 72 has a plurality of grooves 72a extending in an arc shape in the circumferential direction. These plurality of grooves 72a are formed in multiple layers radially inside and outside, and each bus 73, 74 is assembled in each groove 72a in such a manner that the bus plate surfaces are radially opposite to each other. In addition, a plurality of protrusions 72b are provided on the upper surface of the bus holder 72. The protrusions 72b are supporting portions for supporting the arm portions 73a, 74a of each bus 73, 74, and are respectively dispersedly provided in the circumferential direction according to the positions of each arm portion 73a, 74a.

[0115] A plurality of through holes 72c are provided in the radially outer side of each groove 72a at the outer edge of the bus bar holder 72. The through holes 72c are provided as the lead-out portions of the wire ends of each phase winding. Fig.10 The through holes 72c as the lead connection parts in the bus assembly 70 are concentratedly provided at the outer edge of the bus holder 72. In addition, the bus holder 72 is provided with a plurality of assembly parts 72d for assembling the bus assembly 70 to the stator core 31.

[0116] Fig.16 2 is a perspective view showing a state where the bus assembly 70 is assembled in the stator 30. Fig.16 In the embodiment, the bus bar assembly 70 is assembled coaxially with the stator core 31 at one axial end side of the stator core 31 .

[0117] The lead-out portion of each phase winding, which is the end of the wire, is connected to each bus bar 73, 74 on the upper surface side of the bus bar holder 72 while being inserted through the through hole 72c of the bus bar holder 72. Specifically, the end of the wire of each phase winding is joined to the connection portion 73b, 74b of each bus bar 73, 74 by welding or the like. Thus, in each stator winding 32a, 32b, the phase winding of each phase is connected to each other in a desired manner. In addition, the electric terminal portion 73c of the bus bar 73 for each phase is connected to the power line 75 for each phase.

[0118] However, in the rotating electric machine, noise and vibration due to torque fluctuations become a problem. Torque fluctuations mainly have sixth harmonic components or twelfth harmonic components as main components, so it is preferable to suppress them. Therefore, the following control can be performed in the control device 50 using the motor 10 of the above structure.

[0119] In the motor 10 of the above structure,

[0120] The partial windings (first coil bodies) of the U-phase, V-phase, and W-phase in the first stator winding 32a are wound around the first teeth (T3, T6, T9, T12, T15, and T18) of each tooth group.

[0121] A partial winding (second coil body) of each phase of any one of the first stator winding 32a and the second stator winding 32b is wound around the second teeth (T2, T5, T8, T10, T14, T17) of each tooth group.

[0122] Partial windings (third coil bodies) of the X-phase, Y-phase, and Z-phase in the second stator winding 32 b are wound around the third teeth ( T1 , T4 , T7 , T10 , T13 , and T16 ) of each tooth group.

[0123] In this structure, the control device 50 sets the total phase difference of the magnetomotive force generated by the partial winding of the first stator winding 32a wound on the second tooth and the magnetomotive force generated by the partial winding of the second stator winding 32b wound on the second tooth in such a manner that each phase difference of the magnetomotive force of the second coil body of each phase relative to the magnetomotive force of the first coil body of each phase and each phase difference of the magnetomotive force of the third coil body of each phase relative to the magnetomotive force of the second coil body of each phase are within a prescribed phase range including an electrical angle of 20 degrees, or in such a manner that each phase difference of the magnetomotive force of the third coil body of each phase relative to the magnetomotive force of the first coil body of each phase and each phase difference of the magnetomotive force of the second coil body of each phase relative to the magnetomotive force of the third coil body of each phase are within a prescribed phase range including an electrical angle of 20 degrees. The total phase difference can be set, for example, in the range of 72 to 88 degrees in electrical angle. Alternatively, the control device 50 sets the total 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. The details of this control are described in detail in Japanese Patent No. 7103299 of the applicant of this application.

[0124] According to the present embodiment described in detail above, the following excellent effects are achieved.

[0125] In a structure in which the first winding 101 and the second winding 102 of mutually different phases as the stator winding 32 are wound on the same tooth 34 of the stator core 31, the terminal processing (terminal processing at the coil end) of these windings 101 and 102 may be complicated. In addition, the winding start end and the winding end end of the first winding 101 wound first may become obstacles when the second winding 102 wound later is wound. In this regard, in a first range R1 from the first end 34a to the middle position in the radial direction of the tooth 34 on which the first winding 101 and the second winding 102 are wound, the first winding 101 is wound in a manner that the conductive wire material overlaps with the tooth 34 in multiple layers, thereby allowing the first winding 101 to be arranged close to one side of the tooth 34 in the radial direction, and further, the ends of the conductive wire material in the first winding 101 (the winding start end and the winding end end) can be appropriately concentrated on the first end 34a side of the tooth 34. Thus, it is possible to suppress the inconvenience that the winding start end and the winding end end of the first winding 101 wound earlier become obstacles to the second winding 102 wound later. In addition, by winding the second winding 102 in the second range R2 from the second end 34b of the tooth 34 to the position overlapping with the first winding 101, it is possible to use the empty area of ​​the tooth 34 where the first winding 101 is not wound, and the second winding 102 can be wound close to the first end 34a in a state overlapping with the first winding 101. Thus, for the second winding 102, the end of the conductor material can also be brought close to the first end 34a. As a result, the first winding 101 and the second winding 102 can be appropriately wound in the same tooth.

[0126] Since the first winding 101 is wound with the first end 34a of the tooth 34 as the winding starting point and the position overlapping the conductive wire material at the winding starting point as the winding ending point, a structure suitable for arranging the first winding 101 close to one side in the radial direction of the tooth 34 can be realized. In addition, the winding starting point of the second winding 102 is set to a position closer to the tooth between the radial ends of the tooth 34 than the winding starting point of the first winding 101, and the winding is performed toward the center of the tooth, so that the second winding 102 can be appropriately wound while avoiding interference with the end of the first winding 101.

[0127] In the structure using round wire as the conductor material, the first winding 101 and the second winding 102 are wound in a staggered arrangement, and the occupancy rate can be improved. In addition, the staggered arrangement structure of the round wire makes it easier to use a position that is offset from the radial position as the winding starting point of the second winding, and it is easy to realize a structure in which the winding starting point of the second winding 102 is separated from the first end 43a by an amount equivalent to one winding of the conductor material. As a result, it is possible to appropriately avoid interference with the end of the first winding for the second winding.

[0128] In addition, the second winding 102 is configured such that the first end 34a side of the tooth 34 is used as the winding start point and the conductive wire material is folded back at the second end 34b, thereby being wound in multiple layers with respect to the tooth 34. Thus, for the second winding 102, as with the first winding 101, the winding start point and the winding end point of the conductive wire material can be concentrated on the first end 34a side of the tooth 34. Therefore, the operability of the terminal processing when connecting a plurality of first windings 101 constituting the stator winding 32, connecting a plurality of second windings 102, or connecting a first winding 101 and a second winding 102 can be improved.

[0129] In the stator core 31, a structure is set in which the first phase winding C1 is continuously wound around the first tooth and the second tooth among the three consecutive first to third teeth in the circumferential direction, and the second phase winding C2 is continuously wound around the second tooth and the third tooth. In such a structure, one end and the other end of the first phase winding C1 are respectively drawn out from the end portions on the back yoke 33 side of the radial ends of the first tooth and the second tooth, and on the other hand, one end and the other end of the second phase winding C2 are respectively drawn out from the end portions on the back yoke 33 side of the radial ends of the third tooth and the second tooth (refer to Fig.10 (a), (b)). Thus, the three teeth 34 can be grouped together, and the connection of the wire ends in each phase winding to the power supply side or the neutral point can be properly achieved. In addition, since the first phase winding C1 as the first winding is continuous between the first tooth and the second tooth through the transition portion H13 extending in the circumferential direction along the back yoke 33, it becomes a structure in which all the multiple wire ends generated in units of teeth are processed on the back yoke 33 side.

[0130] In a structure in which the first phase winding C1 is continuously wound around the first tooth A1 and the second tooth A2 adjacent in the circumferential direction, in the first winding 101 wound around the second tooth A2, the transition portion H13 extending from the first tooth A1 side becomes the winding starting end, and the opposite side becomes the winding ending end. In this case, in the insulating parts 63 and 64, the rising portion 63b provided on the back yoke 33 side is used to hold the winding starting end (transition portion H13) and the winding ending end of the first winding 101. Thus, the winding starting end and the winding ending end of the first winding 101 can be held on the back yoke 33 side, and appropriately avoid becoming an obstacle when the second winding 102 is wound.

[0131] (Other embodiments)

[0132] The above-mentioned embodiment may be modified as follows, for example.

[0133] In a structure in which the first winding 101 is wound in a first range R1 from the first end 34a to the middle position in the radial direction of the tooth A2 (tooth 34) at the center of the tooth group G, the first winding 101 may be scattered during the winding process. Therefore, as a structure for suppressing the scattering of the first winding 101, the following structure may be provided.

[0134] like Fig.17 As shown, in the tooth 34, a protrusion 81 can be provided at a boundary position opposite to the first end side in the first range R1 in which the first winding 101 is wound, and the protrusion 81 extends in a direction orthogonal to the radial direction and away from the tooth surface. That is, in the radial direction, the protrusion 81 is provided at a position that becomes the boundary portion between the first winding 101 and the second winding 102. The protrusion 81 can be integrally formed with the insulating parts 63 and 64, for example, and is provided to extend from the tooth surface side in at least one direction of the axial direction and the circumferential direction. Among them, the protrusion 81 can also be formed by an electromagnetic steel plate in the tooth 34. According to the above structure, even in a structure in which the first winding 101 is wound in the first range R1 from the first end 34a to the middle position in the radial direction of the tooth 34, the scattering of the first winding 101 can be appropriately suppressed.

[0135] In addition, Fig.18 In the structures shown in (a) and (b) of FIG. 1 , in the insulating parts 63 and 64, the covering parts 63a and 64a covering the axial end face of the tooth 34 are provided with a step part 82, and the step part 82 is used to make the axial thickness dimension different between the first range R1 and the outside of the first range R1. In this case, the first range R1 is the winding range of the first winding 101 in the tooth 34, and the axial thickness dimension of the covering parts 63a and 64a is small in the first range R1. In the split core 61, in terms of the relationship with the axial end face of the coil side CS, the height dimension from the axial end face of the coil side CS is smaller in the first range R1 than in the outside of the first range. In the covering parts 63a and 64a, the part in the first range R1 corresponds to the "first insulating part", and the part outside the first range R1 corresponds to the "second insulating part".

[0136] In the above configuration, the first range R1 where the first winding 101 is wound and the areas outside the first range are formed in a stepped shape in the split core 61, thereby preventing the first winding 101 from being scattered. In addition, in the tooth 34, considering that both the first winding 101 and the second winding 102 are wound in a stacked state in the first range R1, only the second winding 102 is wound in the areas outside the first range R1, so that the axial length dimension in the first range R1 is prevented from being excessively large compared to other parts, and the axial length dimension of the winding is equalized in the radial direction of the tooth 34.

[0137] In addition, instead of providing the step portion 82 on each of the insulating members 63 and 64 on both sides in the axial direction, a step portion 82 may be provided on either of the insulating members 63 and 64 on both sides in the axial direction.

[0138] In addition, if Fig.19 As shown in (a), in the covering portion 63a of the insulating member 63, the portion corresponding to the first range R1 may be provided as an inclined portion 83 that is lower as it approaches the back yoke 33 side (right side of the figure). In this case, the first winding 101 can be wound in a state close to the rising portion 63b on the back yoke 33 side, and the first winding 101 can be prevented from being scattered.

[0139] like Fig.19 As shown in (b), in the covering portion 63a of the insulating member 63, the entire area wound with the first winding 101 and the second winding 102 may be set as an inclined portion 83 that is lower as it approaches the back yoke 33 side (right side of the figure). Fig.18 The structure of (a) and (b) Fig.19 In the structures (a) and (b), it is also possible to combine Fig.17 As shown in the figure, the protrusion 81 is provided at the boundary position of the first range R1. For example, the protrusion 81 may be provided in the insulating members 63 and 64 from the circumferential side surfaces thereof toward the circumferential direction.

[0140] In the stator winding 32, a conductor material formed by arranging a plurality of wires in parallel may be used as the conductor material, and the conductor material may be wound around the teeth. In this case, by thinning the conductor material, it is possible to suppress the first winding 101 from becoming disordered.

[0141] In the above embodiment, in the first phase winding C1 as the first winding group, the partial winding is wound in the order of the first tooth → the second tooth, but this may be changed to a structure in which the partial winding is wound in the order of the second tooth → the first tooth. In addition, in the above embodiment, in the second phase winding C2 as the last winding group, the partial winding is wound in the order of the third tooth → the second tooth, but this may be changed to a structure in which the partial winding is wound in the order of the second tooth → the third tooth.

[0142] In the above embodiment, if Figure 7 As shown in (a) of FIG. 1 , in the first stator winding 32a, the partial windings U1 to U4, V1 to V4, and W1 to W4 of each phase are separated into two by two and connected in a star connection, but this can also be changed. For example, Fig. 20As shown in (a), it is also possible to connect the partial windings U1 to U4, V1 to V4, and W1 to W4 of each phase in series and connect these three-phase series connections through a star connection. The same is true for the second stator winding 32b. Fig. 20 As shown in (b), partial windings X1 to X4, Y1 to Y4, and Z1 to Z4 of each phase may be connected in series and these three-phase series connections may be connected in a star connection.

[0143] In each of the stator windings 32a and 32b, the phase windings of each phase may be connected by a Δ connection instead of a star connection (Y connection).

[0144] In the stator core 31, each split core 61 may have a plurality of teeth 34. For example, the split core 61 may have three teeth 34. In addition, the stator core 31 may not be a split core structure, that is, may be a one-piece annular structure that is inseparable in the circumferential direction.

[0145] The number of teeth of the stator core 31 may be other than 18. However, in this case, the number of teeth may be 3×n.

[0146] In the above embodiment, the stator winding 32 has the first stator winding 32a and the second stator winding 32b, and has a total of six phase windings. However, this may be changed to a structure in which the stator winding 32 has a phase winding of three phases.

[0147] Instead of an inner rotor type rotating electric machine, the rotating electric machine may be an outer rotor type rotating electric machine. In the outer rotor type rotating electric machine, in the stator core 31, the back yoke 33 is radially inside, and the teeth 34 are provided so as to extend from the back yoke 33 toward the radial outside. In this case, the winding start end and the winding end end of the first winding 101 and the winding start end and the winding end end of the second winding 102 can be concentrated on the radially inside base end side (back yoke 33 side) of the teeth 34.

[0148] The following describes technical ideas extracted from the above-mentioned embodiments.

[0149] [Structure 1]

[0150] A stator (30) comprises a stator core (31) and a multi-phase stator winding (32), wherein the stator core comprises a circular annular back yoke (33) and a plurality of teeth (34) extending radially from the back yoke and arranged at predetermined intervals in the circumferential direction, and the stator winding is formed by winding a conductive wire material around the teeth in a concentrated winding manner, wherein:

[0151] A first winding (101) and a second winding (102) having different phases from each other are wound around a predetermined tooth among the plurality of teeth as the stator winding, the first winding being a winding wound before the tooth, and the second winding being a winding wound after the tooth.

[0152] In the tooth on which the first winding and the second winding are wound, the first winding is wound in a first range from a first end on one radial side to a middle position in a radial direction so that the conductive wire material overlaps the tooth in multiple layers, and the second winding is wound in a second range from a second end on the other radial side to a position overlapping with the first winding,

[0153] The first winding is wound with the winding start end and the winding end end of the conductive wire material as positions on the first end side, and the second winding is wound so as to partially overlap the first winding.

[0154] [Structure 2]

[0155] The stator of structure 1, wherein

[0156] The first winding is wound with the first end portion as a winding starting point and a position where the conductive wire overlaps with the winding starting point as a winding ending point.

[0157] The second winding is wound toward the tooth center from a winding starting point closer to the tooth center between the radial ends of the tooth than the winding starting point of the first winding.

[0158] [Structure 3]

[0159] The stator of structure 2, wherein:

[0160] The conductor material is a round wire having a circular cross section, and the first winding and the second winding are wound around the teeth in a staggered arrangement of the conductor material.

[0161] The second winding is wound with a position that is spaced apart from the first end by a distance corresponding to one winding of the conductive wire material as a winding starting point.

[0162] [Structure 4]

[0163] A stator as described in structure 2 or 3, wherein:

[0164] In the tooth, the second winding starts from the first end and is folded back at the second end, whereby the conductive wire is wound in a multi-layered manner with respect to the tooth.

[0165] [Structure 5]

[0166] A stator according to any one of structures 1 to 4, wherein:

[0167] In the tooth, a protrusion (81) is provided at a boundary position opposite to the first end side in the first range where the first winding is wound, and the protrusion extends in a direction perpendicular to the radial direction and away from the tooth surface.

[0168] [Structure 6]

[0169] A stator according to any one of structures 1 to 5, wherein:

[0170] In the tooth, an insulating member (63, 64) is installed at an axial end of the tooth, and the first winding and the second winding are wound in a state where the insulating member is interposed between the first winding and the second winding and the tooth.

[0171] The insulating component has different axial thickness dimensions between the first insulating portion and the second insulating portion, the axial thickness dimension of the first insulating portion is smaller than the axial thickness dimension of the second insulating portion, the first insulating portion is a portion corresponding to the first range in the radial direction, and the second insulating portion is a portion outside the first range.

[0172] [Structure 7]

[0173] A stator according to any one of structures 1 to 6, wherein:

[0174] The stator winding has a plurality of phase windings arranged in phase, each of the phase windings is wound around the teeth in a concentrated winding manner.

[0175] In the stator core, when three teeth that are continuous in the circumferential direction are set as a first tooth, a second tooth, and a third tooth, a first phase winding (C1) among the plurality of phase windings is continuously wound around the first tooth and the second tooth, and a second phase winding (C2) among the plurality of phase windings is continuously wound around the second tooth and the third tooth, and the second tooth is a tooth around which the first winding and the second winding are wound.

[0176] One end and the other end of the first phase winding are respectively drawn out from the end portions on the back yoke side of the radial ends of the first tooth and the second tooth, and on the other hand,

[0177] One end and the other end of the second phase winding are respectively drawn out from the end portions on the back yoke side of the radial ends of the third tooth and the second tooth,

[0178] In the first phase winding and the second phase winding, the first phase winding is the leading winding that is wound first when the winding is wound, and the second phase winding is the trailing winding that is wound later, and the first phase winding is continuous between the first tooth and the second tooth through a transition portion (H13), and the transition portion extends circumferentially along the back yoke.

[0179] [Structure 8]

[0180] The stator described in structure 7, wherein:

[0181] An insulating member (63) is provided at an axial end of the stator core, the insulating member insulating the teeth from the stator winding.

[0182] The insulating member has a rising portion (63b) which is provided on the back yoke side of the tooth in a manner extending in the axial direction.

[0183] A retaining portion (65a, 65b) is provided on the rising portion, which retains the transition portion which is one of the ends of the winding starting point end and the winding ending point end of the first winding wound on the second tooth and the other of the winding starting point end and the winding ending point end of the first winding.

[0184] Although the present disclosure is described according to the embodiment, it should be understood that the present disclosure is not limited to the embodiment, structure. The present disclosure also includes various modifications, deformations within the equivalent range. In addition, various combinations or modes, and other combinations or modes containing only one element, more than one element or less than one element also fall into the category or scope of thought of the present disclosure.

Claims

1. A stator (30), comprising a stator core (31) and a multi-phase stator winding (32), wherein the stator core has a back yoke (33) in an annular shape and a plurality of teeth (34) extending radially from the back yoke and arranged at predetermined intervals in the circumferential direction, wherein the stator winding is formed by winding a conductive wire material around the teeth in a concentrated winding manner, It is characterized in that A first winding (101) and a second winding (102) having different phases from each other are wound around a predetermined tooth among the plurality of teeth as the stator winding, the first winding being a winding wound before the tooth, and the second winding being a winding wound after the tooth. In the tooth on which the first winding and the second winding are wound, the first winding is wound in a first range from a first end on one radial side to a middle position in a radial direction so that the conductive wire material overlaps the tooth in multiple layers, and the second winding is wound in a second range from a second end on the other radial side to a position overlapping with the first winding, The first winding is wound with the winding start end and the winding end end of the conductive wire material as positions on the first end side, and the second winding is wound so as to partially overlap the first winding.

2. The stator according to claim 1, characterized in that: The first winding is wound with the first end portion as a winding starting point and a position where the conductive wire overlaps with the winding starting point as a winding ending point. The second winding is wound toward the tooth center from a winding starting point closer to the tooth center between the radial ends of the tooth than the winding starting point of the first winding.

3. The stator according to claim 2, characterized in that: The conductor material is a round wire having a circular cross section, and the first winding and the second winding are wound around the teeth in a staggered arrangement of the conductor material. The second winding is wound with a position that is spaced apart from the first end by a distance corresponding to one winding of the conductive wire material as a winding starting point.

4. The stator according to claim 2, characterized in that: In the tooth, the second winding starts from the first end and is folded back at the second end, whereby the conductive wire is wound in a multi-layered manner with respect to the tooth.

5. The stator according to claim 1, characterized in that: In the tooth, a protrusion (81) is provided at a boundary position opposite to the first end side in the first range where the first winding is wound, and the protrusion extends in a direction perpendicular to the radial direction and away from the tooth surface.

6. The stator according to claim 1, characterized in that: In the tooth, an insulating member (63, 64) is installed at an axial end of the tooth, and the first winding and the second winding are wound in a state where the insulating member is interposed between the first winding and the second winding and the tooth. The insulating component has different axial thickness dimensions between the first insulating portion and the second insulating portion, the axial thickness dimension of the first insulating portion is smaller than the axial thickness dimension of the second insulating portion, the first insulating portion is a portion corresponding to the first range in the radial direction, and the second insulating portion is a portion outside the first range.

7. The stator according to any one of claims 1 to 6, characterized in that: The stator winding has a plurality of phase windings arranged in phase, each of the phase windings is wound around the teeth in a concentrated winding manner. In the stator core, when three teeth that are continuous in the circumferential direction are set as a first tooth, a second tooth, and a third tooth, a first phase winding (C1) among the plurality of phase windings is continuously wound around the first tooth and the second tooth, and a second phase winding (C2) among the plurality of phase windings is continuously wound around the second tooth and the third tooth, and the second tooth is a tooth around which the first winding and the second winding are wound. One end and the other end of the first phase winding are respectively drawn out from the end portions on the back yoke side of the radial ends of the first tooth and the second tooth, and on the other hand, One end and the other end of the second phase winding are respectively drawn out from the end portions on the back yoke side of the radial ends of the third tooth and the second tooth, In the first phase winding and the second phase winding, the first phase winding is the leading winding that is wound first when the winding is wound, and the second phase winding is the trailing winding that is wound later, and the first phase winding is continuous between the first tooth and the second tooth through a transition portion (H13), and the transition portion extends circumferentially along the back yoke.

8. The stator according to claim 7, characterized in that: An insulating member (63) is provided at an axial end of the stator core, the insulating member insulating the teeth from the stator winding. The insulating member has a rising portion (63b) which is provided on the back yoke side of the tooth in a manner extending in the axial direction. A retaining portion (65a, 65b) is provided on the rising portion, which retains the transition portion which is one of the ends of the winding starting point end and the winding ending point end of the first winding wound on the second tooth and the other of the winding starting point end and the winding ending point end of the first winding.

Images