Stator and motor

Abstract

The present invention relates to a stator and a motor. The stator (3a) comprises: a coil unit assembly (10a) formed by arranging coil units in a ring shape; and a bus bar arranged on the outer peripheral surface of the coil unit assembly (10a), wherein the direction in which the axis (AX) of the stator (3a) extends is defined as the axial direction, the direction orthogonal to the axial direction and in which the outer peripheral surface and the inner peripheral surface of the stator (3a) are opposite is defined as the radial direction, and the direction along the outer periphery of the stator (3a) when viewed from the axial direction is defined as the circumferential direction, the coil unit comprises: a split core having teeth extending in the radial direction; an insulator installed to at least overlap with the teeth; and a coil composed of a winding wound around the teeth through an insulator, the coil unit comprises first to third coil units (30) arranged in a ring shape in sequence and repeatedly arranged along the circumferential direction, the first to third coil units respectively comprising a split core (40), an insulator (50) and a phase winding (70 ), the outer end face of the insulator (50) on the radial direction opposite to the tooth is exposed on the outer peripheral face of the coil unit assembly (10a), the first to third slots (55) are provided on the outer end face of the insulator (50), the first to third slots (55) extend circumferentially throughout each insulator (50), and the positions in the axial direction are different from each other, one end and the other end of each phase winding (70) are led out toward the circumferential end of the slot with different phases of the insulator (50), the bus bar includes the first to third bus bars (20) provided in each slot (55), the second end of each phase winding (70) is adjacent to the first end (71) of each other phase winding (70) in the circumferential direction, and is electrically connected via each bus bar (20), forming a triangle connection forming a parallel circuit in each phase of the U phase winding, the V phase winding and the W phase winding.

Description

Technical Field

[0001] The present invention relates to a stator and a motor. Background Art

[0002] As a stator constituting a motor, for example, an armature is disclosed in Patent Document 1, which comprises: a stator core having a plurality of teeth arranged at equal intervals in the circumferential direction; windings wound around the teeth; and a bus bar connecting specified windings to each other so that a parallel circuit is formed by windings of the same phase, wherein at least two windings adjacent to each other in the circumferential direction are formed by a conductive wire, and a jumper wire composed of the conductive wire and spanned between the at least two windings is connected to the bus bar.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2016-13053

[0004] According to the armature described in Patent Document 1, the number of connection points between the winding and the bus bar can be suppressed to a small number. Figure 1 As shown, the bus bar is arranged above the winding in the axial direction, and therefore tends to be thicker in the axial direction. Summary of the invention

[0005] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a stator and a motor that can be thinned in the axial direction.

[0006] The stator of the present invention comprises: a coil unit assembly formed by arranging coil units in a ring shape; and a bus bar provided on the outer peripheral surface of the coil unit assembly, characterized in that, when the direction in which the axis of the stator extends is defined as an axial direction, the direction orthogonal to the axial direction and opposite to the outer peripheral surface and the inner peripheral surface of the stator is defined as a radial direction, and the direction along the outer periphery of the stator when viewed from the axial direction is defined as a circumferential direction, the coil unit comprises: a split core having teeth extending in the radial direction; an insulator installed so as to overlap with at least the teeth of the split core;and a coil, which is composed of a winding wound on the teeth of the split core via the insulator, the coil unit comprising a first coil unit, a second coil unit and a third coil unit which are repeatedly arranged in a ring shape along the circumferential direction, the first coil unit having a first split core, a first insulator and a first coil composed of a U-phase winding, the second coil unit having a second split core, a second insulator and a second coil composed of a V-phase winding, the third coil unit having a third split core, a third insulator and a third coil composed of a W-phase winding, the first insulator, the second insulator and the third insulator The outer end surface of the body on the opposite side of the tooth in the radial direction is exposed on the outer peripheral surface of the coil unit assembly, and the first groove, the second groove and the third groove are provided on the outer end surfaces of the first insulator, the second insulator and the third insulator. The first groove, the second groove and the third groove extend along the circumferential direction throughout the first insulator, the second insulator and the third insulator, and the positions in the axial direction are different from each other, the first end portion of the U-phase winding is led out toward one end of the first groove in the circumferential direction of the first insulator, and the second end portion of the U-phase winding is led out toward the The first end of the V-phase winding is led out toward one end of the second slot in the circumferential direction of the second insulator, and the second end of the V-phase winding is led out toward one end of the third slot in the circumferential direction of the second insulator, the first end of the W-phase winding is led out toward one end of the third slot in the circumferential direction of the third insulator, and the second end of the W-phase winding is led out toward one end of the first slot in the circumferential direction of the third insulator, and the bus bar includes a first bus bar provided in the first slot, and a second bus bar provided in the second slot. , and a third bus bar provided in the third slot, the second end of the W-phase winding is adjacent to the first end of the U-phase winding in the circumferential direction and is electrically connected via the first bus bar, the second end of the U-phase winding is adjacent to the first end of the V-phase winding in the circumferential direction and is electrically connected via the second bus bar, the second end of the V-phase winding is adjacent to the first end of the W-phase winding in the circumferential direction and is electrically connected via the third bus bar, and the U-phase winding, the V-phase winding, and the W-phase winding constitute a delta connection forming a parallel circuit in each phase. ;

[0007] A motor according to the present invention is characterized by comprising the stator according to the present invention and a rotor provided so as to face the inner peripheral surface of the stator.

[0008] According to the present invention, it is possible to provide a stator and a motor that can be thinned in the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic perspective view showing a motor according to Embodiment 1 of the present invention.

[0010] Figure 2 It is a perspective schematic diagram showing the first coil unit.

[0011] Figure 3 Observed from the axial direction Figure 2 The first coil unit is shown in FIG.

[0012] Figure 4 From the radial observation Figure 2 The first coil unit is shown in FIG.

[0013] Figure 5 It is a perspective schematic diagram showing a state before the first insulator is attached to the first split core.

[0014] Figure 6 It is a perspective schematic diagram showing a state where the first insulator is attached to the first split core.

[0015] Figure 7 It is a perspective schematic diagram showing the second coil unit.

[0016] Figure 8 Observed from the axial direction Figure 7 The second coil unit is shown in FIG.

[0017] Fig. 9 From the radial observation Figure 7 The second coil unit is shown in FIG.

[0018] Fig.10 It is a perspective schematic diagram showing the third coil unit.

[0019] Fig.11 Observed from the axial direction Fig.10 A plan schematic diagram of the third coil unit shown.

[0020] Fig.12 From the radial observation Fig.10 A plan schematic diagram of the third coil unit shown.

[0021] Fig.13 Yes means Figure 2 The first coil unit shown, Figure 7 The second coil unit shown and Fig.10 The third coil units shown are a three-dimensional schematic diagram of a coil unit assembly formed by repeatedly arranging the third coil units in a ring shape along the circumferential direction.

[0022] Fig.14 It is enlarged to show Fig.13A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG.

[0023] Fig.15 It means that the first bus bar, the second bus bar and the third bus bar are arranged at Fig.13 The schematic three-dimensional view of the outer peripheral surface of the coil unit assembly is shown in the previous state.

[0024] Fig.16 The stator of the first embodiment of the present invention is shown, that is, the first bus bar, the second bus bar and the third bus bar are provided at Fig.13 The outer peripheral surface of the coil unit assembly is shown in a three-dimensional schematic diagram of the subsequent state.

[0025] Fig.17 It is enlarged to show Fig.16 A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG.

[0026] Fig.18 It is a perspective schematic diagram showing a stator according to Embodiment 2 of the present invention.

[0027] Fig.19 It is enlarged to show Fig.18 A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG.

[0028] Fig. 20 It is a perspective schematic diagram showing a stator according to Embodiment 3 of the present invention.

[0029] Fig.21 It is enlarged to show Fig. 20 A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG. DETAILED DESCRIPTION

[0030] The stator of the present invention and the motor of the present invention are described below. In addition, the present invention is not limited to the following structure, and appropriate changes can be made within the scope of the present invention. In addition, the present invention also includes a combination of multiple preferred structures described below.

[0031] The embodiments shown below are examples, and it is of course possible to partially replace or combine the structures shown in different embodiments. After Embodiment 2, the description of matters common to Embodiment 1 is omitted, and the differences are mainly described. In particular, the same effects achieved by the same structure are not mentioned in sequence in each embodiment. In the following description, when the embodiments are not particularly distinguished, they are referred to as "the stator of the present invention" and "the motor of the present invention".

[0032] The stator of the present invention comprises: a coil unit assembly formed by arranging coil units in a ring shape; and a bus bar provided on the outer peripheral surface of the coil unit assembly, characterized in that, when the direction in which the axis of the stator extends is defined as an axial direction, the direction orthogonal to the axial direction and opposite to the outer peripheral surface and the inner peripheral surface of the stator is defined as a radial direction, and the direction along the outer periphery of the stator when viewed from the axial direction is defined as a circumferential direction, the coil unit comprises: a split core having teeth extending in the radial direction; an insulator installed so as to overlap with at least the teeth of the split core;and a coil, which is composed of a winding wound on the teeth of the split core via the insulator, the coil unit comprising a first coil unit, a second coil unit and a third coil unit which are repeatedly arranged in a ring shape along the circumferential direction, the first coil unit having a first split core, a first insulator and a first coil composed of a U-phase winding, the second coil unit having a second split core, a second insulator and a second coil composed of a V-phase winding, the third coil unit having a third split core, a third insulator and a third coil composed of a W-phase winding, the first insulator, the second insulator and the third insulator The outer end surface of the body on the opposite side of the tooth in the radial direction is exposed on the outer peripheral surface of the coil unit assembly, and the first groove, the second groove and the third groove are provided on the outer end surfaces of the first insulator, the second insulator and the third insulator. The first groove, the second groove and the third groove extend along the circumferential direction throughout the first insulator, the second insulator and the third insulator, and the positions in the axial direction are different from each other, the first end portion of the U-phase winding is led out toward one end of the first groove in the circumferential direction of the first insulator, and the second end portion of the U-phase winding is led out toward the The first end of the V-phase winding is led out toward one end of the second slot in the circumferential direction of the second insulator, and the second end of the V-phase winding is led out toward one end of the third slot in the circumferential direction of the second insulator, the first end of the W-phase winding is led out toward one end of the third slot in the circumferential direction of the third insulator, and the second end of the W-phase winding is led out toward one end of the first slot in the circumferential direction of the third insulator, and the bus bar includes a first bus bar provided in the first slot, and a second bus bar provided in the second slot. , and a third bus bar provided in the third slot, the second end of the W-phase winding is adjacent to the first end of the U-phase winding in the circumferential direction and is electrically connected via the first bus bar, the second end of the U-phase winding is adjacent to the first end of the V-phase winding in the circumferential direction and is electrically connected via the second bus bar, the second end of the V-phase winding is adjacent to the first end of the W-phase winding in the circumferential direction and is electrically connected via the third bus bar, and the U-phase winding, the V-phase winding, and the W-phase winding constitute a delta connection forming a parallel circuit in each phase. ;

[0033] A motor according to the present invention is characterized by comprising the stator according to the present invention and a rotor provided so as to face the inner peripheral surface of the stator.

[0034] [Implementation Method 1]

[0035] In the stator of the present invention, the bus bar may have a pair of bends adjacent to each other in the circumferential direction, and the ends of the two windings adjacent to each other in the circumferential direction are clamped by the pair of bends in the circumferential direction. Such an example is described below as a stator according to Embodiment 1 of the present invention. In addition, a motor having a stator according to Embodiment 1 of the present invention is described below as a motor according to Embodiment 1 of the present invention.

[0036] Figure 1 It is a schematic perspective view showing a motor according to Embodiment 1 of the present invention.

[0037] like Figure 1 As shown, the motor 1 includes a rotor 2 and a stator 3a. More specifically, in the motor 1, the rotor 2 is located on the inner side of the coaxial axis and the stator 3a is located on the outer side of the coaxial axis with respect to the axis AX. The axis AX corresponds to the rotation axis of the rotor 2.

[0038] In this specification, the direction in which the axis of the stator extends is defined as the axial direction. In addition, the direction orthogonal to the axial direction and in which the outer circumference and the inner circumference of the stator are opposite is defined as the radial direction. In addition, the direction along the outer circumference of the stator when viewed from the axial direction is defined as the circumferential direction. In addition, the axial direction, radial direction, and circumferential direction of the stator correspond to the axial direction, radial direction, and circumferential direction of the coil unit assembly described later, respectively.

[0039] The rotor 2 is provided so as to face the inner circumferential surface of the stator 3 a .

[0040] The rotor 2 is formed by stacking, for example, annular electromagnetic steel sheets in the axial direction. When viewed from the axial direction, the rotor 2 may be in a substantially circular ring shape or in a substantially polygonal ring shape.

[0041] Permanent magnets are provided on the outer peripheral surface of the rotor 2 so that N poles and S poles are alternately arranged in the circumferential direction.

[0042] The stator 3 a has a coil unit assembly 10 a , a first bus bar 20 aa , a second bus bar 20 ba , and a third bus bar 20 ca .

[0043] The coil unit assembly 10 a is formed by repeatedly arranging the first coil unit 30 a , the second coil unit 30 b , and the third coil unit 30 c in a circular shape in the circumferential direction.

[0044] Figure 2 It is a perspective schematic diagram showing the first coil unit. Figure 3 Observed from the axial direction Figure 2 The first coil unit is shown in FIG. Figure 4 From the radial observation Figure 2 The first coil unit is shown in FIG.

[0045] like Figure 2 , Figure 3 as well as Figure 4 As shown, the first coil unit 30a includes a first split core 40a, a first insulator 50a, and a first coil 60a.

[0046] Below, refer to Figure 5 and Figure 6 The first split core 40 a and the first insulator 50 a will be described. Figure 5 It is a perspective schematic diagram showing a state before the first insulator is attached to the first split core. Figure 6 It is a perspective schematic diagram showing a state where the first insulator is attached to the first split core.

[0047] like Figure 5 As shown, the first split core 40a has teeth 41a extending in the radial direction.

[0048] like Figure 5 As shown, the first insulator 50a is separated into two separate parts before being installed on the first split core 40a. Then, the first insulator 50a is installed on the first split core 40a so that the two separate parts clamp the first split core 40a in the axial direction. Thus, the first insulator 50a is installed to overlap with at least the tooth 41a of the first split core 40a.

[0049] In the first insulator 50a, the two separation parts may clamp the first split core 40a without a gap in the axial direction, or may clamp the first split core 40a with a gap in the axial direction. In the first insulator 50a, when the two separation parts clamp the first split core 40a without a gap in the axial direction, the first insulator 50a overlaps with the entire surface of the tooth 41a, so the surface of the tooth 41a is not exposed from the first insulator 50a. On the other hand, in the first insulator 50a, when the two separation parts clamp the first split core 40a with a gap in the axial direction, the first insulator 50a overlaps with a part of the surface of the tooth 41a, so the surface of the tooth 41a is exposed from the first insulator 50a.

[0050] The first insulator 50a may be attached to the first split core 40a so that the two split parts sandwich the first split core 40a in the circumferential direction. In addition, the first insulator 50a may be separated into three or more split parts before being attached to the first split core 40a.

[0051] like Figure 6As shown, the first insulator 50a has a cylindrical portion 51a, an inner flange portion 52a and an outer flange portion 53a after being installed on the first split core 40a. The cylindrical portion 51a overlaps with the tooth 41a, and more specifically, surrounds the periphery of the tooth 41a. The inner flange portion 52a extends axially and circumferentially from the inner end edge of the cylindrical portion 51a located on the inner circumferential surface side of the coil unit assembly 10a. The outer flange portion 53a extends axially and circumferentially from the outer end edge of the cylindrical portion 51a located on the outer circumferential surface side of the coil unit assembly 10a.

[0052] When the first insulator 50a is attached to the first split core 40a, the first split core 40a is exposed from the inner flange portion 52a and the outer flange portion 53a. Figure 2 , Figure 3 as well as Figure 4 As shown, in the exposed portion of the first split core 40a exposed from the outer flange portion 53a, the end surface 42aa of the two end surfaces facing each other in the circumferential direction is convex, and the end surface 42ab is concave.

[0053] The outer end surface of the first insulator 50a on the opposite side of the tooth 41a in the radial direction is exposed on the outer peripheral surface of the coil unit assembly 10a. Figure 2 As shown in the figure, the first groove 55a, the second groove 55b and the third groove 55c are provided on the outer end surface of the first insulator 50a on the opposite side of the tooth 41a in the radial direction, here, on the outer end surface of the axial upper part of the outer flange portion 53a. The first groove 55a, the second groove 55b and the third groove 55c extend in the circumferential direction and have different positions in the axial direction.

[0054] like Figure 2 , Figure 3 as well as Figure 4 As shown, the first coil 60a is composed of a U-phase winding 70a wound around the teeth 41a of the first split core 40a via the first insulator 50a, here, the cylindrical portion 51a.

[0055] The first end 71aa of the U-phase winding 70a is led out toward one end 56aa in the circumferential direction of the first slot 55a of the first insulator 50a. The first end 71aa of the U-phase winding 70a corresponds to the winding start portion of the U-phase winding 70a.

[0056] The second end portion 71ab of the U-phase winding 70a is led out toward one end 56ba in the circumferential direction of the second slot 55b of the first insulator 50a. The second end portion 71ab of the U-phase winding 70a corresponds to the winding end portion of the U-phase winding 70a.

[0057] Figure 7 It is a perspective schematic diagram showing the second coil unit. Figure 8 Observed from the axial direction Figure 7 The second coil unit is shown in FIG. Fig. 9 From the radial observation Figure 7 The second coil unit is shown in FIG.

[0058] like Figure 7 , Figure 8 as well as Fig. 9 As shown, the second coil unit 30b includes a second split core 40b, a second insulator 50b, and a second coil 60b.

[0059] The second insulator 50b is attached to the second split core 40b in front and back states. Figure 5 and Figure 6 The state shown is the same. That is, the second split core 40b has teeth 41b extending in the radial direction. In addition, the second insulator 50b has a cylindrical portion 51b, an inner flange portion 52b and an outer flange portion 53b when installed on the second split core 40b. The cylindrical portion 51b overlaps with the teeth 41b, and more specifically, surrounds the teeth 41b. The inner flange portion 52b extends axially and circumferentially from the inner end edge of the cylindrical portion 51b located on the inner circumferential surface side of the coil unit assembly 10a. The outer flange portion 53b extends axially and circumferentially from the outer end edge of the cylindrical portion 51b located on the outer circumferential surface side of the coil unit assembly 10a.

[0060] When the second insulator 50b is attached to the second split core 40b, the second split core 40b is exposed from the inner flange portion 52b and the outer flange portion 53b. Figure 7 , Figure 8 as well as Fig. 9 As shown, in the exposed portion of the second split core 40b exposed from the outer flange portion 53b, the end surface 42ba of the two end surfaces facing each other in the circumferential direction is convex, and the end surface 42bb is concave.

[0061] The outer end surface of the second insulator 50b on the opposite side of the tooth 41b in the radial direction is exposed to the outer peripheral surface of the coil unit assembly 10a. Figure 7 As shown, the outer end surface of the second insulator 50b on the radial side opposite to the tooth 41b, here refers to the outer end surface of the axial upper part of the outer flange portion 53b, is provided with a first groove 55a, a second groove 55b and a third groove 55c similarly to the first insulator 50a.

[0062] like Figure 7 , Figure 8 as well as Fig. 9 As shown, the second coil 60b is composed of a V-phase winding 70b wound around the teeth 41b of the second split core 40b via the second insulator 50b, here, the cylindrical portion 51b.

[0063] The first end 71ba of the V-phase winding 70b is led out toward one end 56bb in the circumferential direction of the second slot 55b of the second insulator 50b. The first end 71ba of the V-phase winding 70b corresponds to the winding start portion of the V-phase winding 70b.

[0064] The second end portion 71bb of the V-phase winding 70b is led out toward one end 56ca in the circumferential direction of the third slot 55c of the second insulator 50b. The second end portion 71bb of the V-phase winding 70b corresponds to the winding end portion of the V-phase winding 70b.

[0065] Fig.10 It is a perspective schematic diagram showing the third coil unit. Fig.11 Observed from the axial direction Fig.10 A plan schematic diagram of the third coil unit shown. Fig.12 From the radial observation Fig.10 A plan schematic diagram of the third coil unit shown.

[0066] like Fig.10 , Fig.11 as well as Fig.12 As shown, the third coil unit 30c includes a third split core 40c, a third insulator 50c, and a third coil 60c.

[0067] The third insulator 50c is attached to the third split core 40c in the front and rear states. Figure 5 and Figure 6 The third insulator 50c is the same as the state shown. That is, the third split core 40c has teeth 41c extending in the radial direction. In addition, the third insulator 50c has a cylindrical portion 51c, an inner flange portion 52c and an outer flange portion 53c when installed on the third split core 40c. The cylindrical portion 51c overlaps with the teeth 41c, and more specifically, surrounds the teeth 41c. The inner flange portion 52c extends axially and circumferentially from the inner end edge of the cylindrical portion 51c located on the inner circumferential surface side of the coil unit assembly 10a. The outer flange portion 53c extends axially and circumferentially from the outer end edge of the cylindrical portion 51c located on the outer circumferential surface side of the coil unit assembly 10a.

[0068] When the third insulator 50c is attached to the third split core 40c, the third split core 40c is exposed from the inner flange portion 52c and the outer flange portion 53c. Fig.10 , Fig.11 as well as Fig.12 As shown, in the exposed portion of the third split core 40c exposed from the outer flange portion 53c, of the two end surfaces facing each other in the circumferential direction, the end surface 42ca is convex and the end surface 42cb is concave.

[0069] The outer end surface of the third insulator 50c on the opposite side of the tooth 41c in the radial direction is exposed to the outer peripheral surface of the coil unit assembly 10a. Fig.10 As shown, the outer end surface of the third insulator 50c on the radial side opposite to the tooth 41c, here refers to the outer end surface of the axial upper part of the outer flange portion 53c, is provided with a first groove 55a, a second groove 55b and a third groove 55c in the same manner as the first insulator 50a and the second insulator 50b.

[0070] like Fig.10 , Fig.11 as well as Fig.12 As shown, the third coil 60c is composed of a W-phase winding 70c wound around the teeth 41c of the third split core 40c via the third insulator 50c, here, the cylindrical portion 51c.

[0071] The first end portion 71ca of the W-phase winding 70c is led out toward one end 56cb in the circumferential direction of the third slot 55c of the third insulator 50c. The first end portion 71ca of the W-phase winding 70c corresponds to the winding start portion of the W-phase winding 70c.

[0072] The second end portion 71cb of the W-phase winding 70c is led out toward one end 56ab in the circumferential direction of the first slot 55a of the third insulator 50c. The second end portion 71cb of the W-phase winding 70c corresponds to the winding end portion of the W-phase winding 70c.

[0073] Since the first coil unit 30a, the second coil unit 30b, and the third coil unit 30c each have the above-described structure, it is easy to handle a single coil unit.

[0074] Each of the first split core 40a, the second split core 40b, and the third split core 40c is formed by stacking electromagnetic steel sheets in the axial direction, for example.

[0075] Each of the first insulator 50 a , the second insulator 50 b , and the third insulator 50 c includes, for example, an insulating resin.

[0076] The winding directions of the U-phase winding 70a, the V-phase winding 70b, and the W-phase winding 70c are the same, but Figure 4 , Fig. 9 as well as Fig.12 When viewed from the radial direction as shown, it can be counterclockwise or clockwise.

[0077] The first coil unit 30a, the second coil unit 30b, and the third coil unit 30c are connected in a circular manner and repeatedly along the circumferential direction by fitting the end faces of the exposed portion of the first split core 40a, the exposed portion of the second split core 40b, and the exposed portion of the third split core 40c. More specifically, the end face 42ab of the exposed portion of the first split core 40a fits with the end face 42ba of the exposed portion of the second split core 40b, the end face 42bb of the exposed portion of the second split core 40b fits with the end face 42ca of the exposed portion of the third split core 40c, and the end face 42cb of the exposed portion of the third split core 40c fits with the end face 42aa of the exposed portion of the first split core 40a. Instead of such a connection method, the ends of the outer peripheral surfaces of the first coil unit 30a, the second coil unit 30b, and the third coil unit 30c in the circumferential direction are connected to each other by a connecting member.

[0078] As described above, the first coil unit 30a, the second coil unit 30b, and the third coil unit 30c are repeatedly arranged in a ring shape along the circumferential direction to form a Fig.13 The coil unit assembly 10a is shown. Fig.13 Yes means Figure 2 The first coil unit shown, Figure 7 The second coil unit shown and Fig.10 The third coil units shown are a three-dimensional schematic diagram of a coil unit assembly formed by repeatedly arranging the third coil units in a ring shape along the circumferential direction.

[0079] In the coil unit assembly 10a, three first coil units 30a, three second coil units 30b, and three third coil units 30c are provided, but one, two, or four or more of them may be provided.

[0080] In the coil unit assembly 10 a , the first split core 40 a , the second split core 40 b , and the third split core 40 c are repeatedly arranged in a ring shape in the circumferential direction to form a stator core 45 .

[0081] On the outer peripheral surface of the coil unit assembly 10a, the first slot 55a, the second slot 55b and the third slot 55c extend circumferentially throughout the first insulator 50a, the second insulator 50b and the third insulator 50c. That is, the axial position of the first slot 55a is the same as each other on the first insulator 50a, the second insulator 50b and the third insulator 50c. In addition, the axial position of the second slot 55b is the same as each other on the first insulator 50a, the second insulator 50b and the third insulator 50c. In addition, the axial position of the third slot 55c is the same as each other on the first insulator 50a, the second insulator 50b and the third insulator 50c.

[0082] In the coil unit assembly 10a, the first slot 55a, the second slot 55b, and the third slot 55c are arranged in order from the axial bottom to the axial top, more specifically, from the stator core 45 side, and the positions in the axial direction are different from each other. As long as the positions in the axial direction of the first slot 55a, the second slot 55b, and the third slot 55c are different from each other, they can also be arranged in the same manner as Fig.13 Arranged in different order.

[0083] In the coil unit assembly 10a, the second end 71cb of the W-phase winding 70c is adjacent to the first end 71aa of the U-phase winding 70a in the circumferential direction. The second end 71cb of the W-phase winding 70c may or may not be in contact with the first end 71aa of the U-phase winding 70a. The second end 71cb of the W-phase winding 70c may be connected to the first end 71aa of the U-phase winding 70a by, for example, soldering or welding.

[0084] In the coil unit assembly 10a, the second end 71ab of the U-phase winding 70a is adjacent to the first end 71ba of the V-phase winding 70b in the circumferential direction. The second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b may or may not be in contact. The second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b may be connected by, for example, soldering or welding.

[0085] In the coil unit assembly 10a, the second end 71bb of the V-phase winding 70b is adjacent to the first end 71ca of the W-phase winding 70c in the circumferential direction. The second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c may or may not be in contact. The second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c may be connected by, for example, soldering or welding.

[0086] Fig.14 It is enlarged to show Fig.13 A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG.

[0087] It is preferable that the second insulator 50b is provided with a circumferential positioning unit for circumferentially positioning the second end portion 71bb of the V-phase winding 70b. Fig.14 As shown in the figure, the second insulator 50b is provided with a wall portion 57a ​​as an example of a circumferential positioning means, which is in contact with the side of the second end portion 71bb of the V-phase winding 70b opposite to the third insulator 50c in the circumferential direction. Since the wall portion 57a ​​is provided in the second insulator 50b, the second end portion 71bb of the V-phase winding 70b is positioned on the side opposite to the third insulator 50c in the circumferential direction, so that the lead-out position of the second end portion 71bb of the V-phase winding 70b in the circumferential direction is easily determined.

[0088] It is preferable that the third insulator 50c is provided with a circumferential positioning unit for circumferentially positioning the first end portion 71ca of the W-phase winding 70c. Fig.14 As shown in FIG. 1 , the third insulator 50c is provided with a wall portion 57b that contacts the first end portion 71ca of the W-phase winding 70c on the side opposite to the second insulator 50b in the circumferential direction as an example of a circumferential positioning unit. Since the wall portion 57b is provided on the third insulator 50c, the first end portion 71ca of the W-phase winding 70c is positioned on the side opposite to the second insulator 50b in the circumferential direction, and thus the lead-out position of the first end portion 71ca of the W-phase winding 70c in the circumferential direction is easily determined.

[0089] like Fig.14 As shown, it is more preferable that the wall portion 57a ​​is provided on the second insulator 50b, and the wall portion 57b is provided on the third insulator 50c. Thus, it is easy to determine the circumferential lead-out position of the second end portion 71bb of the V-phase winding 70b and the first end portion 71ca of the W-phase winding 70c, which are adjacent in the circumferential direction. Therefore, it is easy to connect the second end portion 71bb of the V-phase winding 70b and the third bus bar 20ca, and the first end portion 71ca of the W-phase winding 70c and the third bus bar 20ca, which will be described later.

[0090] The above describes, with reference to the accompanying drawings, a representative description of the circumferential positioning unit for the second end 71bb of the V-phase winding 70b and the circumferential positioning unit for the first end 71ca of the W-phase winding 70c. However, for the ends of the windings other than the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c, it is also preferred to provide a circumferential positioning unit for circumferential positioning as illustrated below.

[0091] Preferably, the third insulator 50c is provided with a wall portion that contacts the side of the second end portion 71cb of the W-phase winding 70c opposite to the first insulator 50a in the circumferential direction as an example of circumferential positioning means. Thus, the second end portion 71cb of the W-phase winding 70c is positioned on the side opposite to the first insulator 50a in the circumferential direction, so that the lead-out position of the second end portion 71cb of the W-phase winding 70c in the circumferential direction is easily determined.

[0092] Preferably, the first insulator 50a is provided with a wall portion that contacts the first end portion 71aa of the U-phase winding 70a on the side opposite to the third insulator 50c in the circumferential direction as an example of circumferential positioning means. Thus, the first end portion 71aa of the U-phase winding 70a is positioned on the side opposite to the third insulator 50c in the circumferential direction, so that the lead-out position of the first end portion 71aa of the U-phase winding 70a in the circumferential direction is easily determined.

[0093] It is more preferable that the third insulator 50c is provided with a wall portion that contacts the side of the second end 71cb of the W-phase winding 70c opposite to the first insulator 50a in the circumferential direction, and the first insulator 50a is provided with a wall portion that contacts the side of the first end 71aa of the U-phase winding 70a opposite to the third insulator 50c in the circumferential direction. Thus, it is easy to determine the circumferential lead-out position of the second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a that are adjacent in the circumferential direction. Therefore, it is easy to connect the second end 71cb of the W-phase winding 70c and the first bus bar 20aa, and the first end 71aa of the U-phase winding 70a and the first bus bar 20aa, which will be described later.

[0094] Preferably, the first insulator 50a is provided with a wall portion that contacts the second end portion 71ab of the U-phase winding 70a on the side opposite to the second insulator 50b in the circumferential direction as an example of circumferential positioning means. Thus, the second end portion 71ab of the U-phase winding 70a is positioned on the side opposite to the second insulator 50b in the circumferential direction, so that the lead-out position of the second end portion 71ab of the U-phase winding 70a in the circumferential direction is easily determined.

[0095] Preferably, the second insulator 50b is provided with a wall portion that contacts the first end portion 71ba of the V-phase winding 70b on the side opposite to the first insulator 50a in the circumferential direction as an example of circumferential positioning means. Thus, the first end portion 71ba of the V-phase winding 70b is positioned on the side opposite to the first insulator 50a in the circumferential direction, so that the lead-out position of the first end portion 71ba of the V-phase winding 70b in the circumferential direction is easily determined.

[0096] It is more preferable that a wall portion is provided on the first insulator 50a so as to contact the side of the second end 71ab of the U-phase winding 70a opposite to the second insulator 50b in the circumferential direction, and a wall portion is provided on the second insulator 50b so as to contact the side of the first end 71ba of the V-phase winding 70b opposite to the first insulator 50a in the circumferential direction. Thus, it is easy to determine the circumferential lead-out position of the second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b which are adjacent in the circumferential direction. Therefore, it is easy to connect the second end 71ab of the U-phase winding 70a and the second bus bar 20ba, and to connect the first end 71ba of the V-phase winding 70b and the second bus bar 20ba, which will be described later.

[0097] Preferably, the second insulator 50b is provided with an axial positioning unit for axially positioning the second end portion 71bb of the V-phase winding 70b. Fig.14As shown in FIG. 1 , the second insulator 50b is provided with a top portion 58a as an example of an axial positioning unit, which contacts the upper side of the second end portion 71bb of the V-phase winding 70b in the axial direction, and here refers to the side of the second end portion 71bb of the V-phase winding 70b in the axial direction opposite to the second groove 55b. Fig.14 As shown, as an example of axial positioning means, the second insulator 50b is provided with a bottom 59a that contacts the second groove 55b side of the second end 71bb of the V-phase winding 70b in the axial direction. By providing the top 58a and the bottom 59a in the second insulator 50b, the second end 71bb of the V-phase winding 70b is axially positioned, so that the axial lead-out position of the second end 71bb of the V-phase winding 70b is easily determined. In addition, it is preferred that the second insulator 50b is provided with the top 58a and the bottom 59a as axial positioning means for the second end 71bb of the V-phase winding 70b, but only one of the top 58a and the bottom 59a may be provided.

[0098] Preferably, the third insulator 50c is provided with an axial positioning unit for axially positioning the first end portion 71ca of the W-phase winding 70c. Fig.14 As shown in FIG. 1 , the third insulator 50c is provided with a top portion 58b that contacts the upper side of the first end portion 71ca of the W-phase winding 70c in the axial direction, that is, the side of the first end portion 71ca of the W-phase winding 70c opposite to the second groove 55b in the axial direction, as an example of an axial positioning unit. Fig.14 As shown, the third insulator 50c is provided with a bottom 59b that contacts the lower side of the first end 71ca of the W-phase winding 70c in the axial direction, here, the second groove 55b side of the first end 71ca of the W-phase winding 70c in the axial direction as an example of an axial positioning unit. By providing the top 58b and the bottom 59b in the third insulator 50c, the first end 71ca of the W-phase winding 70c is positioned in the axial direction, so that the axial lead-out position of the first end 71ca of the W-phase winding 70c is easily determined. In addition, it is preferable that the third insulator 50c is provided with the top 58b and the bottom 59b as axial positioning units for the first end 71ca of the W-phase winding 70c, but only one of the top 58b and the bottom 59b may be provided.

[0099] like Fig.14As shown, it is more preferable that the second insulator 50b is provided with a top portion 58a and a bottom portion 59a, and the third insulator 50c is provided with a top portion 58b and a bottom portion 59b. Thus, it is easy to determine the axial lead-out position of the second end portion 71bb of the V-phase winding 70b and the first end portion 71ca of the W-phase winding 70c, which are adjacent in the circumferential direction. Therefore, it is easy to connect the second end portion 71bb of the V-phase winding 70b and the third bus bar 20ca, and to connect the first end portion 71ca of the W-phase winding 70c and the third bus bar 20ca, which will be described later.

[0100] In the above, the axial positioning unit for the second end 71bb of the V-phase winding 70b and the axial positioning unit for the first end 71ca of the W-phase winding 70c are representatively described with reference to the accompanying drawings, but for the ends of the windings other than the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c, it is also preferred to provide an axial positioning unit for axial positioning as shown in the example below.

[0101] Preferably, the third insulator 50c is provided with a top portion that contacts the upper side of the second end portion 71cb of the W-phase winding 70c in the axial direction, here, the second groove 55b side of the second end portion 71cb of the W-phase winding 70c in the axial direction as an example of axial positioning means. Also, preferably, the third insulator 50c is provided with a bottom portion that contacts the lower side of the second end portion 71cb of the W-phase winding 70c in the axial direction, here, the side of the second end portion 71cb of the W-phase winding 70c opposite to the second groove 55b in the axial direction as an example of axial positioning means. By providing such a top portion and a bottom portion in the third insulator 50c, the second end portion 71cb of the W-phase winding 70c is positioned in the axial direction, and thus it is easy to determine the lead-out position of the second end portion 71cb of the W-phase winding 70c in the axial direction. Furthermore, the third insulator 50c is preferably provided with a top portion and a bottom portion as axial positioning means for the second end portion 71cb of the W-phase winding 70c, but only one of the top portion and the bottom portion may be provided.

[0102] It is preferable that the first insulator 50a is provided with a top portion that contacts the upper side of the first end portion 71aa of the U-phase winding 70a in the axial direction, here, the second groove 55b side of the first end portion 71aa of the U-phase winding 70a in the axial direction as an example of axial positioning means. In addition, it is preferable that the first insulator 50a is provided with a bottom portion that contacts the lower side of the first end portion 71aa of the U-phase winding 70a in the axial direction, here, the side of the first end portion 71aa of the U-phase winding 70a opposite to the second groove 55b in the axial direction as an example of axial positioning means. By providing such a top portion and a bottom portion in the first insulator 50a, the first end portion 71aa of the U-phase winding 70a is positioned in the axial direction, so that the axial lead-out position of the first end portion 71aa of the U-phase winding 70a is easily determined. In addition, it is preferable that the first insulator 50a is provided with a top portion and a bottom portion as axial positioning means for the first end portion 71aa of the U-phase winding 70a, but only one of the top portion and the bottom portion may be provided.

[0103] It is more preferable that the third insulator 50c is provided with a top portion that contacts the upper side of the second end portion 71cb of the W-phase winding 70c in the axial direction and a bottom portion that contacts the lower side of the second end portion 71cb of the W-phase winding 70c in the axial direction, and the first insulator 50a is provided with a top portion that contacts the upper side of the first end portion 71aa of the U-phase winding 70a in the axial direction and a bottom portion that contacts the lower side of the first end portion 71aa of the U-phase winding 70a in the axial direction. Thus, it is easy to determine the axial lead-out position of the second end portion 71cb of the W-phase winding 70c and the first end portion 71aa of the U-phase winding 70a that are adjacent in the circumferential direction. Therefore, it is easy to connect the second end portion 71cb of the W-phase winding 70c to the first bus bar 20aa and the first end portion 71aa of the U-phase winding 70a to the first bus bar 20aa described later.

[0104] It is preferred that the first insulator 50a is provided with a top portion that contacts the upper side of the second end portion 71ab of the U-phase winding 70a in the axial direction, here, the third groove 55c side of the second end portion 71ab of the U-phase winding 70a in the axial direction, as an example of axial positioning means. In addition, it is preferred that the first insulator 50a is provided with a bottom portion that contacts the lower side of the second end portion 71ab of the U-phase winding 70a in the axial direction, here, the first groove 55a side of the second end portion 71ab of the U-phase winding 70a in the axial direction, as an example of axial positioning means. By providing such a top portion and a bottom portion in the first insulator 50a, the second end portion 71ab of the U-phase winding 70a is positioned in the axial direction, so that the axial lead-out position of the second end portion 71ab of the U-phase winding 70a is easily determined. In addition, it is preferred that the first insulator 50a is provided with a top portion and a bottom portion as axial positioning means for the second end portion 71ab of the U-phase winding 70a, but only one of the top portion and the bottom portion may be provided.

[0105] Preferably, the second insulator 50b is provided with a top portion that contacts the upper side of the first end portion 71ba of the V-phase winding 70b in the axial direction, here, the third groove 55c side of the first end portion 71ba of the V-phase winding 70b in the axial direction, as an example of axial positioning means. Also, preferably, the second insulator 50b is provided with a bottom portion that contacts the lower side of the first end portion 71ba of the V-phase winding 70b in the axial direction, here, the first groove 55a side of the first end portion 71ba of the V-phase winding 70b in the axial direction, as an example of axial positioning means. By providing such a top portion and a bottom portion in the second insulator 50b, the first end portion 71ba of the V-phase winding 70b is positioned in the axial direction, so that the lead-out position of the first end portion 71ba of the V-phase winding 70b in the axial direction is easily determined. Also, preferably, the second insulator 50b is provided with a top portion and a bottom portion as axial positioning means for the first end portion 71ba of the V-phase winding 70b, but only one of the top portion and the bottom portion may be provided.

[0106] It is more preferable that the first insulator 50a is provided with a top portion that contacts the upper side of the second end portion 71ab of the U-phase winding 70a in the axial direction and a bottom portion that contacts the lower side of the second end portion 71ab of the U-phase winding 70a in the axial direction, and the second insulator 50b is provided with a top portion that contacts the upper side of the first end portion 71ba of the V-phase winding 70b in the axial direction and a bottom portion that contacts the lower side of the first end portion 71ba of the V-phase winding 70b in the axial direction. Thus, it is easy to determine the axial lead-out position of the second end portion 71ab of the U-phase winding 70a and the first end portion 71ba of the V-phase winding 70b that are adjacent in the circumferential direction. Therefore, it is easy to connect the second end portion 71ab of the U-phase winding 70a to the second bus bar 20ba and the first end portion 71ba of the V-phase winding 70b to the second bus bar 20ba described later.

[0107] Fig.15 It means that the first bus bar, the second bus bar and the third bus bar are arranged at Fig.13 The schematic three-dimensional view of the outer peripheral surface of the coil unit assembly is shown in the previous state. Fig.16 The stator of the first embodiment of the present invention is shown, that is, the first bus bar, the second bus bar and the third bus bar are provided at Fig.13 The outer peripheral surface of the coil unit assembly is shown in a three-dimensional schematic diagram of the subsequent state.

[0108] By Fig.15 The first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca are arranged on the outer peripheral surface of the coil unit assembly 10a, thereby forming Fig.16 The stator 3a is shown.

[0109] like Fig.16 As shown, the first bus bar 20aa is arranged in the first slot 55a. In addition, the second bus bar 20ba is arranged in the second slot 55b. In addition, the third bus bar 20ca is arranged in the third slot 55c. By arranging the first bus bar 20aa, the second bus bar 20ba and the third bus bar 20ca in this way, the first bus bar 20aa, the second bus bar 20ba and the third bus bar 20ca are accommodated within the axial length range of the coil unit assembly 10a, so that the axial thinning of the stator 3a can be achieved. In addition, in the motor 1, since the stator 3a is provided, the axial thinning can also be achieved.

[0110] like Fig.16As shown, preferably in the radial direction, the outer end of the first bus bar 20aa located on the side opposite to the inner circumference of the coil unit assembly 10a is located closer to the inner circumference of the coil unit assembly 10a than the outer end of the outer circumference of the coil unit assembly 10a. By arranging the first bus bar 20aa in this way, the first bus bar 20aa is accommodated within the radial length range of the coil unit assembly 10a, so that the radial miniaturization of the stator 3a can be achieved. In addition, in the motor 1, since the stator 3a is provided, radial miniaturization can also be achieved. In addition, in the radial direction, the outer end of the outer circumference of the coil unit assembly 10a can also be located closer to the inner circumference of the coil unit assembly 10a than the outer end of the first bus bar 20aa located on the side opposite to the inner circumference of the coil unit assembly 10a.

[0111] like Fig.16 As shown, preferably in the radial direction, the outer end of the second bus bar 20ba located on the side opposite to the inner circumference of the coil unit assembly 10a is located closer to the inner circumference of the coil unit assembly 10a than the outer end of the outer circumference of the coil unit assembly 10a. By arranging the second bus bar 20ba in this way, the second bus bar 20ba is accommodated within the radial length range of the coil unit assembly 10a, so that the radial miniaturization of the stator 3a can be achieved. Furthermore, in the motor 1, since the stator 3a is provided, radial miniaturization can also be achieved. In addition, in the radial direction, the outer end of the outer circumference of the coil unit assembly 10a can also be located closer to the inner circumference of the coil unit assembly 10a than the outer end of the second bus bar 20ba located on the side opposite to the inner circumference of the coil unit assembly 10a.

[0112] like Fig.16 As shown, preferably in the radial direction, the outer end of the third bus bar 20ca located on the side opposite to the inner circumference of the coil unit assembly 10a is located closer to the inner circumference of the coil unit assembly 10a than the outer end of the outer circumference of the coil unit assembly 10a. By arranging the third bus bar 20ca in this way, the third bus bar 20ca is accommodated within the radial length range of the coil unit assembly 10a, so that the radial miniaturization of the stator 3a can be achieved. Furthermore, in the motor 1, since the stator 3a is provided, radial miniaturization can also be achieved. In addition, in the radial direction, the outer end of the outer circumference of the coil unit assembly 10a can also be located closer to the inner circumference of the coil unit assembly 10a than the outer end of the third bus bar 20ca located on the side opposite to the inner circumference of the coil unit assembly 10a.

[0113] like Fig.16As shown, it is more preferred that in the radial direction, each outer end of the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca, which are located on the side opposite to the inner circumference of the coil unit assembly 10a, is located closer to the inner circumference of the coil unit assembly 10a than the outer end of the outer circumference of the coil unit assembly 10a. By arranging the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca in this way, the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca are accommodated within the radial length range of the coil unit assembly 10a, so that the radial miniaturization of the stator 3a can be fully achieved. Furthermore, in the motor 1, since the stator 3a is provided, the radial miniaturization can also be fully achieved.

[0114] Fig.17 It is enlarged to show Fig.16 A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG.

[0115] like Fig.17 As shown in FIG. 1 , the third bus bar 20ca has a pair of curved portions, namely, a curved portion 21a and a curved portion 21b, which are adjacent to each other in the circumferential direction. The curved portion 21a is located on the surface of the wall portion 57a ​​provided on the second insulator 50b on the axial direction opposite to the second groove 55b. The curved portion 21b is located on the surface of the wall portion 57b provided on the third insulator 50c on the axial direction opposite to the second groove 55b. In the third bus bar 20ca, the axial lengths of the curved portions 21a and 21b are smaller than the axial lengths of the other portions.

[0116] The second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c, which are adjacent in the circumferential direction, are clamped in the circumferential direction by the curved portions 21a and 21b. More specifically, the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c are clamped in the circumferential direction by the curved portions 21a and 21b in a state of being bent axially upward.

[0117] The second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c are clamped in the circumferential direction by the bent portion 21a and the bent portion 21b, whereby the second end 71bb of the V-phase winding 70b contacts the first end 71ca of the W-phase winding 70c and is electrically connected via the third bus bar 20ca. That is, the second end 71bb of the V-phase winding 70b is connected to the third bus bar 20ca. The second end 71bb of the V-phase winding 70b and the third bus bar 20ca may be directly connected or may be connected by, for example, soldering or welding. In addition, the first end 71ca of the W-phase winding 70c is connected to the third bus bar 20ca. The first end 71ca of the W-phase winding 70c and the third bus bar 20ca may be directly connected or may be connected by, for example, soldering or welding.

[0118] The second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c are clamped in the circumferential direction by the curved portion 21a and the curved portion 21b, so that the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c are fixed between the curved portion 21a and the curved portion 21b. Therefore, it is easy to connect the second end 71bb of the V-phase winding 70b to the first end 71ca of the W-phase winding 70c by, for example, soldering or welding, or to connect the second end 71bb of the V-phase winding 70b to the third bus bar 20ca by, for example, soldering or welding, or to connect the first end 71ca of the W-phase winding 70c to the third bus bar 20ca by, for example, soldering or welding. In addition, the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c are not easily detached due to external vibration, impact, etc.

[0119] The above representatively illustrates the fixing method of the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c based on the third busbar 20ca with reference to the accompanying drawings, but in the combination of the ends of two circumferentially adjacent windings, in addition to the combination of the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c, they are also clamped circumferentially by a pair of bent portions of the busbar as shown below.

[0120] The second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a, which are adjacent in the circumferential direction, are clamped in the circumferential direction by a pair of bent portions of the first bus bar 20aa. More specifically, the second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a are clamped in the circumferential direction by a pair of bent portions of the first bus bar 20aa in a state of being bent axially upward.

[0121] The second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a are clamped in the circumferential direction by a pair of bent portions, whereby the second end 71cb of the W-phase winding 70c contacts the first end 71aa of the U-phase winding 70a and is electrically connected via the first bus bar 20aa. That is, the second end 71cb of the W-phase winding 70c is connected to the first bus bar 20aa. The second end 71cb of the W-phase winding 70c and the first bus bar 20aa may be directly connected or connected by, for example, soldering or welding. In addition, the first end 71aa of the U-phase winding 70a is connected to the first bus bar 20aa. The first end 71aa of the U-phase winding 70a and the first bus bar 20aa may be directly connected or connected by, for example, soldering or welding.

[0122] The second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a are clamped in the circumferential direction by a pair of curved portions, whereby the second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a are fixed between the pair of curved portions. Therefore, it is easy to connect the second end 71cb of the W-phase winding 70c to the first end 71aa of the U-phase winding 70a by, for example, soldering, welding, etc., or to connect the second end 71cb of the W-phase winding 70c to the first bus bar 20aa by, for example, soldering, welding, etc., or to connect the first end 71aa of the U-phase winding 70a to the first bus bar 20aa by, for example, soldering, welding, etc. In addition, the second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a are not easily detached due to external vibration, impact, etc.

[0123] The second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b, which are adjacent in the circumferential direction, are clamped in the circumferential direction by a pair of bent portions of the second bus bar 20ba. More specifically, the second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b are clamped in the circumferential direction by a pair of bent portions of the second bus bar 20ba in a state of being bent axially upward.

[0124] The second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b are clamped in the circumferential direction by a pair of bent portions, whereby the second end 71ab of the U-phase winding 70a contacts the first end 71ba of the V-phase winding 70b and is electrically connected via the second bus bar 20ba. That is, the second end 71ab of the U-phase winding 70a is connected to the second bus bar 20ba. The second end 71ab of the U-phase winding 70a and the second bus bar 20ba can be connected directly or by, for example, soldering or welding. In addition, the first end 71ba of the V-phase winding 70b is connected to the second bus bar 20ba. The first end 71ba of the V-phase winding 70b and the second bus bar 20ba can be connected directly or by, for example, soldering or welding.

[0125] The second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b are clamped in the circumferential direction by a pair of curved portions, whereby the second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b are fixed between the pair of curved portions. Therefore, it is easy to connect the second end 71ab of the U-phase winding 70a to the first end 71ba of the V-phase winding 70b by, for example, soldering, welding, etc., or to connect the second end 71ab of the U-phase winding 70a to the second bus bar 20ba by, for example, soldering, welding, etc., or to connect the first end 71ba of the V-phase winding 70b to the second bus bar 20ba by, for example, soldering, welding, etc. In addition, the second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b are not easily detached due to external vibration, impact, etc.

[0126] As described above, the U-phase winding 70a, the V-phase winding 70b, and the W-phase winding 70c are electrically connected to each other via the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca, thereby forming a delta connection that forms a parallel circuit in each phase. The first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca are connected to a drive circuit (not shown), and the drive circuit supplies drive currents of three phases, namely, U phase, V phase, and W phase, to the U-phase winding 70a, the V-phase winding 70b, and the W-phase winding 70c, respectively, via the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca.

[0127] In the combination of the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c, the combination of the second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a, and the combination of the second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b, as described above, it is preferred that the ends of the two windings in all combinations are clamped circumferentially by a pair of bent portions of the bus bar, but it is also possible that the ends of the two windings in a part of the combinations are clamped circumferentially by a pair of bent portions of the bus bar.

[0128] When viewed from the axial direction, the first bus bar 20aa is preferably annular. Therefore, when the U-phase drive current flows through the first bus bar 20aa, the flow direction of the drive current is not limited to one direction, for example, clockwise, so the current density is easily reduced.

[0129] The second bus bar 20ba is preferably annular when viewed from the axial direction. Therefore, when the V-phase drive current flows through the second bus bar 20ba, the flow direction of the drive current is not limited to one direction, for example, clockwise, so the current density is easily reduced.

[0130] The third bus bar 20ca is preferably annular when viewed from the axial direction. Therefore, when the W-phase drive current flows through the third bus bar 20ca, the flow direction of the drive current is not limited to one direction, for example, clockwise, so the current density is easily reduced.

[0131] When viewed from the axial direction, the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca may each be substantially annular or substantially polygonal.

[0132] More preferably, when viewed from the axial direction, the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca are each annular. In addition, when viewed from the axial direction, a portion of the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca may be annular. In addition, when viewed from the axial direction, at least one of the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca may be in an open ring shape.

[0133] like Fig.15 As shown, the first bus bar 20aa is preferably formed in a ring shape in a manner that both ends of one conductor are in contact. In this case, for example, the first bus bar 20aa can be manufactured by punching out one conductor from a conductor plate and bending it, and the remaining portion of the conductor plate can be used when manufacturing other bus bars. Therefore, the waste portion of the conductor plate becomes extremely small, thereby reducing the manufacturing cost.

[0134] On the other hand, when a ring-shaped bus bar is manufactured by punching a ring-shaped conductor from a conductor plate, the remaining portion of the conductor plate cannot be used to manufacture a ring-shaped bus bar of the same size. Therefore, a large amount of conductor plate is discarded, resulting in an increase in manufacturing cost.

[0135] From the same point of view, Fig.15 As shown in FIG. 1 , the second bus bar 20ba is preferably formed into a ring shape in such a way that both ends of one conductor are in contact with each other. Fig.15 As shown, the third bus bar 20ca is preferably formed in a ring shape so that both ends of one conductor are in contact with each other.

[0136] like Fig.15 As shown, it is more preferred that the first bus bar 20aa, the second bus bar 20ba and the third bus bar 20ca are each formed into a ring shape in a manner that the two ends of a conductor are in contact. In addition, some of the first bus bar 20aa, the second bus bar 20ba and the third bus bar 20ca may be formed into a ring shape in a manner that the two ends of a conductor are in contact.

[0137] The first bus bar 20aa may include copper. Thus, the first bus bar 20aa has a low resistance, so that the U-phase drive current easily flows through the first bus bar 20aa.

[0138] The second bus bar 20ba may include copper. Thus, the second bus bar 20ba has a low resistance, so that the V-phase drive current easily flows through the second bus bar 20ba.

[0139] The third bus bar 20ca may include copper. Thus, the third bus bar 20ca has a low resistance, so that the W-phase drive current easily flows through the third bus bar 20ca.

[0140] From the viewpoint of facilitating the flow of the three-phase drive current of the U phase, the V phase, and the W phase, the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca preferably each contain copper. Alternatively, a portion of the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca may contain copper.

[0141] The first bus bar 20aa may include a conductive elastic material. This makes it easier to attach the first bus bar 20aa to the coil unit assembly 10a.

[0142] The second bus bar 20ba may include a conductive elastic material, thereby facilitating the attachment of the second bus bar 20ba to the coil unit assembly 10a.

[0143] The third bus bar 20ca may include a conductive elastic material, thereby facilitating the attachment of the third bus bar 20ca to the coil unit assembly 10a.

[0144] From the viewpoint of easy installation in the coil unit assembly 10a, the first bus bar 20aa, the second bus bar 20ba and the third bus bar 20ca preferably each include a conductive elastic material. Alternatively, some of the first bus bar 20aa, the second bus bar 20ba and the third bus bar 20ca may include a conductive elastic material.

[0145] Examples of the conductive elastic material include iron, stainless steel, aluminum, and alloys containing at least one of these metals.

[0146] [Implementation Method 2]

[0147] In the stator of the present invention, the ends of the windings may be connected to terminals provided on the insulator, and electrically connected to the busbars via the terminals. Such an example is described below as a stator according to a second embodiment of the present invention. The stator according to the second embodiment of the present invention is the same as the stator according to the first embodiment of the present invention, except that the ends of the windings are connected to terminals provided on the insulator.

[0148] Fig.18 It is a perspective schematic diagram showing a stator according to Embodiment 2 of the present invention.

[0149] like Fig.18 As shown, the stator 3b has a coil unit assembly 10b, a first bus bar 20ab, a second bus bar 20bb, and a third bus bar 20cb.

[0150] The first bus bar 20ab is provided in the first groove 55a. In addition, the second bus bar 20bb is provided in the second groove 55b. In addition, the third bus bar 20cb is provided in the third groove 55c.

[0151] With reference Fig.15 Compared with the first bus bar 20aa, the second bus bar 20ba, and the third bus bar 20ca described above, the first bus bar 20ab, the second bus bar 20bb, and the third bus bar 20cb have a simple shape without a bent portion, and thus the manufacturing cost is reduced.

[0152] Fig.19 It is enlarged to show Fig.18 A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG.

[0153] The second end portion 71bb of the V-phase winding 70b is connected to a terminal provided on the second insulator 50b, and is electrically connected to the third bus bar 20cb via the terminal. Fig.19 As shown in FIG. 1 , as an example of such a terminal, a terminal 80a is provided in the second insulator 50b so as to contact the second end 71bb of the V-phase winding 70b on the side opposite to the third insulator 50c in the circumferential direction. That is, the terminal 80a is provided on the side opposite to the third insulator 50c. Fig.14 The terminal 80a is provided on the second insulator 50b by, for example, bonding, integral molding, etc.

[0154] The second end portion 71bb of the V-phase winding 70b is connected to the terminal 80a. The second end portion 71bb of the V-phase winding 70b and the terminal 80a may be directly connected or connected by soldering, welding, or the like.

[0155] The second end 71bb of the V-phase winding 70b is electrically connected to the third bus bar 20cb via the terminal 80a. That is, the third bus bar 20cb is connected to the terminal 80a. The third bus bar 20cb and the terminal 80a may be directly connected or connected by, for example, soldering or welding. In addition, the second end 71bb of the V-phase winding 70b may or may not be in contact with the third bus bar 20cb.

[0156] The first end portion 71ca of the W-phase winding 70c is connected to a terminal provided on the third insulator 50c, and is electrically connected to the third bus bar 20cb via the terminal. Fig.19 As shown in FIG. 1 , the third insulator 50c is provided with a terminal 80b that contacts the first end 71ca of the W-phase winding 70c on the side opposite to the second insulator 50b in the circumferential direction as an example of such a terminal. That is, the terminal 80b is provided on the side opposite to the second insulator 50b. Fig.14 The terminal 80b is provided on the third insulator 50c by, for example, bonding, integral molding, or the like.

[0157] The first end portion 71ca of the W-phase winding 70c is connected to the terminal 80b. The first end portion 71ca of the W-phase winding 70c and the terminal 80b may be directly connected or connected by soldering, welding, or the like.

[0158] The first end 71ca of the W-phase winding 70c is electrically connected to the third bus bar 20cb via the terminal 80b. That is, the third bus bar 20cb is connected to the terminal 80b. The third bus bar 20cb and the terminal 80b may be directly connected or connected by, for example, soldering or welding. In addition, the first end 71ca of the W-phase winding 70c may or may not be in contact with the third bus bar 20cb.

[0159] The second end 71bb of the V-phase winding 70b is connected to the terminal 80a, whereby the second end 71bb of the V-phase winding 70b is fixed to the terminal 80a. In addition, the first end 71ca of the W-phase winding 70c is connected to the terminal 80b, whereby the first end 71ca of the W-phase winding 70c is fixed to the terminal 80b. Thus, the connection between the second coil unit 30b and the third coil unit 30c becomes easy.

[0160] The connection method of the second end 71bb of the V-phase winding 70b and the connection method of the first end 71ca of the W-phase winding 70c are representatively described above with reference to the accompanying drawings, but the ends of the windings other than the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c are also connected to the terminals provided on the insulator as shown below, and are electrically connected to the busbar via the terminals.

[0161] The second end 71cb of the W-phase winding 70c is connected to a terminal provided on the third insulator 50c, and is electrically connected to the first bus bar 20ab via the terminal. As an example of such a terminal, the third insulator 50c is provided with a terminal that contacts the second end 71cb of the W-phase winding 70c on the side opposite to the first insulator 50a in the circumferential direction.

[0162] The first end 71aa of the U-phase winding 70a is connected to a terminal provided on the first insulator 50a, and is electrically connected to the first bus bar 20ab via the terminal. As an example of such a terminal, the first insulator 50a is provided with a terminal that contacts the first end 71aa of the U-phase winding 70a on the side opposite to the third insulator 50c in the circumferential direction.

[0163] The second end 71cb of the W-phase winding 70c is connected to the terminal, thereby fixing the second end 71cb of the W-phase winding 70c to the terminal. In addition, the first end 71aa of the U-phase winding 70a is connected to the terminal, thereby fixing the first end 71aa of the U-phase winding 70a to the terminal. Thus, the connection between the third coil unit 30c and the first coil unit 30a becomes easy.

[0164] The second end 71ab of the U-phase winding 70a is connected to a terminal provided on the first insulator 50a, and is electrically connected to the second bus bar 20bb via the terminal. As an example of such a terminal, the first insulator 50a is provided with a terminal that contacts the second end 71ab of the U-phase winding 70a on the side opposite to the second insulator 50b in the circumferential direction.

[0165] The first end 71ba of the V-phase winding 70b is connected to a terminal provided on the second insulator 50b, and is electrically connected to the second bus bar 20bb via the terminal. As an example of such a terminal, the second insulator 50b is provided with a terminal that contacts the first end 71ba of the V-phase winding 70b on the side opposite to the first insulator 50a in the circumferential direction.

[0166] The second end 71ab of the U-phase winding 70a is connected to the terminal, thereby fixing the second end 71ab of the U-phase winding 70a to the terminal. In addition, the first end 71ba of the V-phase winding 70b is connected to the terminal, thereby fixing the first end 71ba of the V-phase winding 70b to the terminal. Thus, the connection between the first coil unit 30a and the second coil unit 30b becomes easy.

[0167] As described above, among the second end 71bb of the V-phase winding 70b, the first end 71ca of the W-phase winding 70c, the second end 71cb of the W-phase winding 70c, the first end 71aa of the U-phase winding 70a, the second end 71ab of the U-phase winding 70a, and the first end 71ba of the V-phase winding 70b, the ends of all the windings are preferably connected to terminals provided on the insulator and electrically connected to the bus bar via the terminals, but the ends of a part of the windings may be connected to terminals provided on the insulator and electrically connected to the bus bar via the terminals.

[0168] The motor according to the second embodiment of the present invention is the same as the motor according to the first embodiment of the present invention, except that it includes the stator according to the second embodiment of the present invention.

[0169] [Implementation method 3]

[0170] The ends of the windings are fixed between a pair of bent portions of the busbar in the stator of the first embodiment, and are fixed to terminals provided on the insulator in the stator of the second embodiment, but may also be fixed by methods other than these. Such an example is described below as a stator of the third embodiment of the present invention. The stator of the third embodiment of the present invention is the same as the stator of the first embodiment of the present invention, except that no bent portion is provided on the busbar. In addition, the stator of the third embodiment of the present invention is the same as the stator of the second embodiment of the present invention, except that no terminal is provided on the insulator.

[0171] Fig. 20 It is a perspective schematic diagram showing a stator according to Embodiment 3 of the present invention.

[0172] like Fig. 20 As shown, the stator 3c has a coil unit assembly 10a, a first bus bar 20ab, a second bus bar 20bb, and a third bus bar 20cb.

[0173] Fig.21 It is enlarged to show Fig. 20 A three-dimensional schematic diagram of the area surrounded by the dotted line in FIG.

[0174] like Fig.21As shown, the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c, which are adjacent in the circumferential direction, are fixed in the space between the second insulator 50b and the third insulator 50c, more specifically, in the space surrounded by the wall 57a, the top 58a, the bottom 59a, the wall 57b, the top 58b, and the bottom 59b. By such a fixing method, it is also easy to connect the second end 71bb of the V-phase winding 70b to the first end 71ca of the W-phase winding 70c by, for example, soldering or welding, or to connect the second end 71bb of the V-phase winding 70b to the third bus bar 20cb by, for example, soldering or welding, or to connect the first end 71ca of the W-phase winding 70c to the third bus bar 20cb by, for example, soldering or welding.

[0175] The above describes representatively the fixing method of the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c with reference to the accompanying drawings, but in the combination of the ends of two circumferentially adjacent windings, in addition to the combination of the second end 71bb of the V-phase winding 70b and the first end 71ca of the W-phase winding 70c, they are also fixed in the space between two circumferentially adjacent insulators as shown below.

[0176] The second end 71cb of the W-phase winding 70c and the first end 71aa of the U-phase winding 70a, which are adjacent in the circumferential direction, are fixed in the space between the third insulator 50c and the first insulator 50a. By such a fixing method, it is also easy to connect the second end 71cb of the W-phase winding 70c to the first end 71aa of the U-phase winding 70a by, for example, soldering or welding, or to connect the second end 71cb of the W-phase winding 70c to the first bus bar 20ab by, for example, soldering or welding, or to connect the first end 71aa of the U-phase winding 70a to the first bus bar 20ab by, for example, soldering or welding.

[0177] The second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b adjacent to each other in the circumferential direction are fixed in the space between the first insulator 50a and the second insulator 50b. By such a fixing method, it is also easy to connect the second end 71ab of the U-phase winding 70a and the first end 71ba of the V-phase winding 70b by, for example, soldering or welding, or to connect the second end 71ab of the U-phase winding 70a and the second bus bar 20bb by, for example, soldering or welding, or to connect the first end 71ba of the V-phase winding 70b and the second bus bar 20bb by, for example, soldering or welding.

[0178] Furthermore, in the stator 3c, since no terminal is provided on the insulator, the number of components is reduced compared to the stator 3b, and thus the manufacturing cost is reduced.

[0179] The motor according to the third embodiment of the present invention is the same as the motor according to the first embodiment of the present invention except that it has the stator according to the third embodiment of the present invention. The motor according to the third embodiment of the present invention is the same as the motor according to the second embodiment of the present invention except that it has the stator according to the third embodiment of the present invention.

[0180] Description of Reference Numerals

[0181] 1...motor; 2...rotor; 3a, 3b, 3c...stator; 10a, 10b...coil unit assembly; 20aa, 20ab...first bus bar; 20ba, 20bb...second bus bar; 20ca, 20cb...third bus bar; 21a, 21b...bend; 30a...first coil unit; 30b...second coil unit; 30c...third coil unit; 40a...first split core; 40b...second split core; 40c...third split core; 41a, 41b , 41c...teeth; 42aa, 42ab...end faces of the exposed portion of the first split core; 42ba, 42bb...end faces of the exposed portion of the second split core; 42ca, 42cb...end faces of the exposed portion of the third split core; 45...stator core; 50a...first insulator; 50b...second insulator; 50c...third insulator; 51a, 51b, 51c...cylindrical portion; 52a, 52b, 52c...inner flange portion; 53a, 53b, 53c...outer flange portion; 55a.. .first groove; 55b...second groove; 55c...third groove; 56aa...one end of the first groove of the first insulator in the circumferential direction; 56ab...one end of the first groove of the third insulator in the circumferential direction; 56ba...one end of the second groove of the first insulator in the circumferential direction; 56bb...one end of the second groove of the second insulator in the circumferential direction; 56ca...one end of the third groove of the second insulator in the circumferential direction; 56cb...one end of the third groove of the third insulator in the circumferential direction; 57a, 57b...wall; 58a, 58b...top; 59a , 59b...bottom; 60a...first coil; 60b...second coil; 60c...third coil; 70a...U-phase winding; 70b...V-phase winding; 70c...W-phase winding; 71aa...first end of U-phase winding; 71ab...second end of U-phase winding; 71ba...first end of V-phase winding; 71bb...second end of V-phase winding; 71ca...first end of W-phase winding; 71cb...second end of W-phase winding; 80a, 80b...terminals; AX...axis line.

Claims

1. A stator comprising: a coil unit assembly formed by arranging coil units in a ring shape; and a bus bar provided on an outer peripheral surface of the coil unit assembly, The stator is characterized in that When the direction in which the axis of the stator extends is defined as the axial direction, the direction perpendicular to the axial direction and in which the outer circumferential surface and the inner circumferential surface of the stator are opposite to each other is defined as the radial direction, and the direction along the outer circumference of the stator when viewed from the axial direction is defined as the circumferential direction, The coil unit comprises: a split core having teeth extending in the radial direction; an insulator installed to overlap at least the teeth of the split core; and a coil composed of a winding wound around the teeth of the split core via the insulator. The coil unit includes a first coil unit, a second coil unit and a third coil unit which are repeatedly arranged in a ring shape along the circumferential direction. The first coil unit includes a first split core, a first insulator, and a first coil formed of a U-phase winding. The second coil unit includes a second split core, a second insulator, and a second coil composed of a V-phase winding. The third coil unit includes a third split core, a third insulator, and a third coil composed of a W-phase winding. The outer end surfaces of the first insulator, the second insulator, and the third insulator on the opposite side to the teeth in the radial direction are exposed on the outer peripheral surface of the coil unit assembly. A first groove, a second groove, and a third groove are provided on the outer end surfaces of the first insulator, the second insulator, and the third insulator, the first groove, the second groove, and the third groove extend along the circumferential direction throughout the first insulator, the second insulator, and the third insulator, and the positions in the axial direction are different from each other, The first end of the U-phase winding is led out toward one end of the first slot of the first insulator in the circumferential direction, and the second end of the U-phase winding is led out toward one end of the second slot of the first insulator in the circumferential direction. The first end of the V-phase winding is led out toward one end of the second slot of the second insulator in the circumferential direction, and the second end of the V-phase winding is led out toward one end of the third slot of the second insulator in the circumferential direction. The first end of the W-phase winding is led out toward one end of the third slot of the third insulator in the circumferential direction, and the second end of the W-phase winding is led out toward one end of the first slot of the third insulator in the circumferential direction. The bus bar includes a first bus bar disposed in the first slot, a second bus bar disposed in the second slot, and a third bus bar disposed in the third slot, The second end of the W-phase winding is adjacent to the first end of the U-phase winding in the circumferential direction and is electrically connected via the first bus bar. The second end of the U-phase winding is adjacent to the first end of the V-phase winding in the circumferential direction and is electrically connected via the second bus bar. The second end of the V-phase winding is adjacent to the first end of the W-phase winding in the circumferential direction and is electrically connected via the third bus bar. The U-phase winding, the V-phase winding, and the W-phase winding constitute a delta connection that forms a parallel circuit in each phase.

2. The stator according to claim 1, wherein: The bus bar has a pair of bent portions adjacent to each other in the circumferential direction, Ends of two of the windings adjacent to each other in the circumferential direction are sandwiched by the pair of bent portions in the circumferential direction.

3. The stator according to claim 1, wherein: The end of the winding wire is connected to a terminal provided on the insulator, and is electrically connected to the bus bar via the terminal.

4. The stator according to any one of claims 1 to 3, wherein: The insulator is provided with a circumferential positioning unit for positioning the end of the winding wire in the circumferential direction.

5. The stator according to any one of claims 1 to 3, wherein: The insulator is provided with an axial positioning unit for positioning the end of the winding in the axial direction.

6. The stator according to any one of claims 1 to 3, wherein: In the radial direction, the outer end of the bus bar located on the opposite side of the inner peripheral surface of the coil unit assembly is located closer to the inner peripheral surface of the coil unit assembly than the outer end of the outer peripheral surface of the coil unit assembly.

7. The stator according to any one of claims 1 to 3, wherein: When viewed from the axial direction, the bus bar has a ring shape.

8. The stator according to claim 7, wherein: The bus bar is formed in a ring shape such that both ends of one conductor are in contact with each other.

9. The stator according to any one of claims 1 to 3, wherein: The bus bar contains copper.

10. The stator according to any one of claims 1 to 3, wherein: The bus bar contains an electrically conductive elastic material.

11. A motor, characterized in that: have: The stator according to any one of claims 1 to 10; and The rotor is arranged opposite to the inner circumference of the stator.

Images