INSULATOR, STATOR, AND MOTOR

FIELD

The present disclosure relates to an insulator, a stator, and a motor.

BACKGROUND

There has been known a technique concerning a motor including a stator including a stator core and a coil, a rotor, and an insulator (see, for example, Patent Literature 1). In the technique described in Patent Literature 1, the insulator has a structure that improves cooling efficiency by cooling oil supplied to the coil wound around the stator core.

CITATION LIST
Patent Literature

Patent Literature 1: JP 2012-213275 A

SUMMARY
Technical Problem

In order to downsize the motor and improve output, it is necessary to reduce the number of poles. When the number of poles is reduced, the number of coils wound around one tooth increases. Accordingly, it is necessary to form a locking section of an insulator provided to restrict a coil from coming off larger than a locking section of the insulator of the related art. However, a path of a nozzle used when the coil is wound is likely to interfere with the locking section of the insulator as in the related art. Therefore, in the insulator, the path of the nozzle used when the coil is wound needs to be secured.

An object of the present disclosure is to provide an insulator, a stator, and a motor in which a path of a nozzle used when a coil is wound is secured.

Solution to Problem

According to an aspect of the present invention, an insulator disposed between a stator core and a three-phase coil wound around the stator core, the insulator comprises: a main body section that covers a portion around which the coil is wound in the stator core and insulates the stator core from the coil; a locking section disposed at an end portion on a radial direction inner side of the main body section; and a plurality of jumper wire holding sections that are disposed on a radial direction outer side of the main body section and hold jumper wires of the coil, wherein in an axial direction view, at least one of the plurality of jumper wire holding sections is formed shorter in a circumferential direction on the radial direction outer side than in the circumferential direction on the radial direction inner side.

According to another aspect of the present invention, a stator of a motor comprises: the insulator; the stator core to which the insulator is attached; and the coil wound around the stator core via the insulator.

According to still another aspect of the present invention, a motor comprises: the end face; and a rotor that rotates with respect to the stator.

Advantageous Effects of Invention

According to the present disclosure, there are provided an insulator, a stator, and a motor in which a path of a nozzle used when a coil is wound is secured.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram schematically illustrating a stator including an insulator according to a first embodiment.

FIG. 2 is a perspective view schematically illustrating a state in which a coil is not disposed in the stator illustrated in FIG. 1.

FIG. 3 is an exploded perspective view of the stator including the insulator illustrated in FIG. 2.

FIG. 4 is a perspective view of a first member of the insulator according to the first embodiment.

FIG. 5 is a perspective view of the first member of the insulator according to the first embodiment.

FIG. 6 is a schematic diagram of the first member of the insulator according to the first embodiment.

FIG. 7 is a cross-sectional view of the first member of the insulator according to the first embodiment taken along line A-A.

FIG. 8 is a cross-sectional view of the first member of the insulator according to the first embodiment taken along line B-B.

FIG. 9 is a plan view of the first member of the insulator according to the first embodiment.

FIG. 10 is a perspective view of a second member of the insulator according to the first embodiment.

FIG. 11 is a perspective view of the first member and the second member of the insulator according to the first embodiment.

FIG. 12 is a schematic diagram for explaining a path of a nozzle.

FIG. 13 is a schematic diagram for explaining the path of the nozzle.

DESCRIPTION OF EMBODIMENTS

In the following explanation, an embodiment according to the present disclosure is explained with reference to the drawings. However, the present invention is not limited to the embodiment. Constituent elements of the embodiment explained below can be combined as appropriate. A part of the constituent elements is sometimes not used.

First Embodiment
<Motor>

FIG. 1 is a diagram schematically illustrating a stator including an insulator according to a first embodiment. FIG. 2 is a perspective view schematically illustrating a state in which a coil is not disposed in the stator illustrated in FIG. 1. FIG. 3 is an exploded perspective view of the stator including the insulator illustrated in FIG. 2. In the figures, the shape of a coil 3 is schematically illustrated. The stator including the insulator is disposed in a not-illustrated three-phase 24-pole segment-type switched reluctance motor. The motor includes a cylindrical stator 1 and a not-illustrated rotor disposed on the inner side of the stator 1. The stator 1 includes a cylindrical stator core 2 and a coil 3 supported by the stator core 2. The inner circumferential surface of the stator 2 and the outer circumferential surface of the rotor face at an interval.

In the following explanation, a direction parallel to a rotation axis AX of the motor is referred to as axial direction. the axial direction one side is referred to as axial direction one side and the side opposite to the axial direction one side is referred to as axial direction other side. A direction of turning around the rotation axis AX is referred to as circumferential direction. One side in a rotating direction in the circumferential direction is referred to circumferential direction one side and the side opposite to the circumferential direction one side is referred to as circumferential direction other side. Further, a radiation direction of the rotation axis AX is referred to as radial direction. A direction side away from the central axis AX in the radial direction is referred to as radial direction outer side and the side opposite to the radial direction outer side is referred to as radial direction inner side.

The stator core 2 includes a main body section 20, teeth 21, and slots 22 that house the coil 3. The slots 22 are recesses recessed from the inner circumferential surface to the radial direction outer side. A plurality of slots 22 are provided in the circumferential direction on the inner circumferential surface of the stator core 2. In the present embodiment, twenty-four slots 22 are disposed in the stator core 2 in the circumferential direction. In the present embodiment, the number of slots of the stator 2 is twenty-four. The slots 22 extend in the axial direction. The slots 22 are disposed on the inner circumferential surface. The slots 22 are opened toward the axial direction one side, the axial direction other side, and the radial direction inner side.

The stator core 2 includes a plurality of teeth 21 disposed among the slots 22 adjacent to one another in the circumferential direction. In the present embodiment, twenty-four teeth 21 are disposed in the stator core 2 in the circumferential direction. The teeth 21 are sections around which the coil 3 is wound in the stator core 2. The teeth 21 support the coil 3. The teeth 21 are inserted into openings of the coil 3.

The coil 3 is disposed in the periphery of the teeth 21. The coil 3 is supported by the teeth 21. The coil 3 includes the openings. The teeth 21 are inserted into the openings of the coil 3. The coil 3 is attached to the stator core 2 via an insulator 5. Since the number of poles of the motor is reduced, a winding number of the coil 3 wound around one tooth 21 is larger compared with that of a 36-pole motor of the related art.

The coil 3 includes a not-illustrated coil main body section and a not-illustrated coil end portion. A portion of the coil 3 housed in the slots 22 is the coil main body section. A portion protruding from the stator core 2 in the axial direction in the coil 3 is the coil end portion.

The coil 3 is made of, for example, a linear or belt-like conductor such as a flat wire, a round wire, or a plate-like segment conductor. The coil 3 is made of a conductor disposed in a spiral shape. The coil 3 may be configured by winding one conductor in a spiral shape or may be configured by connecting a plurality of conductors in a spiral shape. A winding method and a connection method for the coil 3 are not limited.

The coil 3 includes an A-phase coil (a first-phase coil) 3A, a B-phase coil (a second-phase coil) 3B, and a C-phase coil (a third-phase coil) 3C. When it is not particularly necessary to distinguish the A-phase coil 3A, the B-phase coil 3B, and the C-phase coil 3C, the coils are described as the coil 3.

In the circumferential direction, the A-phase coil 3A and the B-phase coil 3B are adjacent to each other. In the circumferential direction, the B-phase coil 3B and the C-phase coil 3C are adjacent to each other. In the circumferential direction, the C-phase coil 3C and the A-phase coil 3A are adjacent to each other. The B-phase coil 3B is disposed next to the circumferential direction one side of the A-phase coil 3A. The C-phase coil 3C is disposed next to the circumferential direction one side of the B-phase coil 3B. The A-phase coil 3A is disposed next to circumferential direction one side of the C-phase coil 3C.

The insulator 5 is formed of a member made of resin. The insulator 5 is interposed between the coil 3 and the stator core 2. The insulator 5 is divided into a plurality in the circumferential direction. In the present embodiment, the insulator 5 is divided into twelve. The insulator 5 is divided into two in the axial direction. In other words, the insulator 5 is divided into a first member 6 on one side and a second member 7 on the other side in the axial direction.

One insulator 5 divided in the circumferential direction has a double-linked structure. Since one insulator 5 divided in the circumferential direction has the double-linked structure, the A-phase, the B-phase, and the C-phase cannot be fixed. Therefore, one insulator 5 divided in the circumferential direction fixes SN winding and makes the A-phase, the B-phase, and the C-phase common.

The first member 6 of one insulator 5 divided in the circumferential direction is explained with reference to FIG. 4 to FIG. 6. FIG. 4 is a perspective view of the first member of the insulator according to the first embodiment. FIG. 5 is a perspective view of the first member of the insulator according to the first embodiment. FIG. 6 is a schematic diagram of the first member of the insulator according to the first embodiment. FIG. 6 is a schematic diagram in which the circumferential direction is made linear for explanation. The first member 6 includes a wall section 60, a main body section 61, a locking section 62, and a jumper wire holding section 63.

The wall section 60 has a shape obtained by dividing a disk into a plurality in the circumferential direction. When all the wall sections 60 of the first member 6 of the insulator 5 divided in the circumferential direction are connected, the wall section 60 is formed in a disk shape.

The main body section 61 is protruded to the radial direction inner side from the end portion on the radial direction inner side of the wall section 60. The main body section 61 is a portion around which the coil 3 is wound. The main body section 61 is connected to an end portion on the axial direction one side of a main body section 71 of the second member 7. In a state of being assembled with the main body section 71 of the second member 7, the main body section 61 is disposed to cover the teeth 21 of the stator core 2 around which the coil 3 is wound. The main body section 61 is disposed to cover the axial direction one side of the teeth 21.

The locking section 62 restricts the coil 3 from coming off the main body section 61. The locking section 62 is longer on the axial direction one side than the main body section 61 and expands in the circumferential direction. The locking section 62 is formed higher in the axial direction higher than a locking section of the insulator of the related art. The locking section 62 is disposed on the radial direction inner side of the main body section 61. The locking section 62 is connected to the end portion on the axial direction one side of a locking section 72 of the second member 7.

The jumper wire holding section 63 holds jumper wires of the phases of the coil 3. The jumper wire holding section 63 holds a jumper wire 3AT, a jumper wire 3BT, and a jumper wire 3CT. The jumper wire holding section 63 is disposed further on the axial direction one side than the wall section 60. The jumper wire holding section 63 is disposed further on the radial direction outer side than the main body section 61.

The jumper wire holding section 63 is divided into a plurality in the circumferential direction. In the present embodiment, the jumper wire holding section 63 is divided into a jumper wire holding section 63₁, a jumper wire holding section 63₂, a jumper wire holding section 63₃, a jumper wire holding section 63₄, and a jumper wire holding section 63₅. The jumper wire holding sections 63₁, the jumper wire holding sections 63₂, the jumper wire holding sections 63₃, the jumper wire holding sections 63₄, and the jumper wire holding sections 63₅are formed in different shapes. Planar shapes of the jumper wire holding section 63₁, the jumper wire holding section 63₂, the jumper wire holding section 63₃, the jumper wire holding section 63₄, and the jumper wire holding section 63₅are explained below. When it is not particularly necessary to distinguish the jumper wire holding section 63₁, the jumper wire holding section 63₂, the jumper wire holding section 63₃, the jumper wire holding section 63₄, and the jumper wire holding section 63₅, the jumper wire holding sections are explained as the jumper wire holding section 63.

In the jumper wire holding section 63, a first groove 64A, a second groove 64B, and a third groove 64C are formed. The first groove 64A, the second groove 64B, and the third groove 64C are disposed to be separated in the axial direction. The first groove 64A, the second groove 64B, and the third groove 64C are formed in different shapes. The first groove 64A, the second groove 64B, and the third groove 64C have, for example, shapes different in depths in the radial direction. The first groove 64A, the second groove 64B, and the third groove 64C have, for example, shapes different in widths in the axial direction.

The first groove 64A is a groove that holds the jumper wire 3AT of the A-phase coil 3A. The first groove 64A is formed in the outer circumferential portion of the jumper wire holding section 63. The first groove 64A is opened toward the radial direction outer side. The first groove 64A is located on the axial direction one side of the jumper wire holding section 63. The jumper wire 3AT housed in the first groove 64A does not intersect the jumper wire 3BT and the jumper wire 3CT of the other phases on paths to the slots 22 of the stator core 2.

The second groove 64B is a groove that holds the jumper wire 3BT of the B-phase coil 3B. The second groove 64B is formed in the outer circumferential portion of the jumper wire holding section 63. The second groove 64B is opened toward the radial direction outer side. The second groove 64B is located further on the axial direction other side than the first groove 64A of the jumper wire holding section 63. The jumper wire 3BT housed in the second groove 64B does not intersect the jumper wire 3AT and the jumper wire 3CT of the other phases on the path to the slot 22 of the stator core 2.

The third groove 64C is a groove that holds the jumper wire 3CT of the C-phase coil 3C. The third groove 64C is formed in the outer circumferential portion of the jumper wire holding section 63. The third groove 64C opens toward the radial direction outer side. The third groove 64C is located on the axial direction other side with respect to the second groove 64B of the jumper wire holding section 63. The jumper wire 3CT housed in the third groove 64C does not intersect the jumper wire 3AT and the jumper wire 3BT of the other phase on the path to the slot 22 of the stator core 2.

In the jumper wire holding section 63 including the first groove 64A, the second groove 64B, and the third groove 64C configured as explained above, a first coil end portion of the jumper wire 3AT of the A-phase coil 3A in the first groove 64A, a second coil end portion of the jumper wire 3BT of the B-phase coil 3B in the second groove 64B, and a third coil end portion of the jumper wire 3CT of the C-phase coil 3C in the third groove 64C are present at different positions in the radial direction.

The jumper wire holding section 63 is explained with reference to FIG. 7. FIG. 7 is a cross-sectional view of the first member of the insulator according to the first embodiment taken along line A-A. At the position of the A-A line illustrated in FIG. 6, as illustrated in FIG. 7, the height in the radial direction of the jumper wire 3AT of the A-phase coil 3A housed in the first groove 64A is smaller than the height in the radial direction of the jumper wire 3BT of the B-phase coil 3B housed in the second groove 64B. The height in the radial direction of the jumper wire 3BT of the B-phase coil 3B housed in the second groove 64B is smaller than the height in the radial direction of the jumper wire 3CT of the C-phase coil 3C housed in the third groove 64C. At the position of the line A-A illustrated in FIG. 6, as illustrated in FIG. 7, only the jumper wire 3BT of the B-phase coil 3B housed in the second groove 64B extends to the slot 22 of the stator core 2. Accordingly, at the position of the line A-A illustrated in FIG. 6, as illustrated in FIG. 7, the jumper wire 3BT housed in the second groove 64B does not intersect the jumper wire 3AT and the jumper wire 3CT of the other phases on the path to the slot 22 of the stator core 2.

The height in the radial direction of the jumper wire 3AT of the A-phase coil 3A housed in the first groove 64A is, in other words, the height in the depth direction of the first groove 64A. The height in the radial direction of the jumper wire 3BT of the B-phase coil 3B housed in the second groove 64B is, in other words, the height of the second groove 64B in the depth direction. The height in the radial direction of the jumper wire 3CT of the C-phase coil 3C housed in the third groove 64C is, in other words, the height in the depth direction of the third groove 64C.

The jumper wire holding section 63 is explained with reference to FIG. 8. FIG. 8 is a cross-sectional view taken along line B-B of the first member of the insulator according to the first embodiment. At the position of the B-B line illustrated in FIG. 6, as illustrated in FIG. 8, the height in the radial direction of the jumper wire 3AT of the A-phase coil 3A housed in the first groove 64A is smaller than the height in the radial direction of the jumper wire 3BT of the B-phase coil 3B housed in the second groove 64B. The height in the radial direction of the jumper wire 3BT of the B-phase coil 3B housed in the second groove 64B is smaller than the height in the radial direction of the jumper wire 3CT of the C-phase coil 3C housed in the third groove 64C. At the position of the B-B line illustrated in FIG. 6, only the jumper wire 3AT of the A-phase coil 3A housed in the first groove 64A extends to the slot 22 of the stator core 2. Accordingly, at the position of the B-B line illustrated in FIG. 6, as illustrated in FIG. 8, the jumper wire 3AT housed in the first groove 64A does not intersect the jumper wire 3BT and the jumper wire 3CT of the other phases on the path to the slot 22 of the stator core 2.

A planar shape of the first member of the insulator is explained with reference to FIG. 9. FIG. 9 is a plan view of the first member of the insulator according to the first embodiment. The shape illustrated in FIG. 9 is one of a plurality of members obtained by dividing the first member 6 in the circumferential direction. In other words, the members illustrated in FIG. 9 are coupled in the circumferential direction to form the first member 6, a plane shape of which is a ring shape.

The jumper wire holding section 63₁is coupled to the jumper wire holding section 63₅of another member located next to the jumper wire holding section 63₁on the circumferential direction one side. The jumper wire holding section 63₅is coupled to the jumper wire holding section 63₁of another member located next to the jumper wire holding section 63₅on the circumferential direction one side.

The jumper wire holding section 63₂is located on the radial direction outer side of a main body section 61₂. The jumper wire holding section 63₂is located on an axis passing the center in the circumferential direction of the main body section 61₂. The jumper wire holding section 63₄is located on the radial direction outer side of a main body section 61₄. The jumper wire holding section 63₄is located on an axis passing the center in the circumferential direction of the main body section 61₄.

The jumper wire holding section 63₁, the jumper wire holding section 63₃, and the jumper wire holding section 63₅are located to deviate in the circumferential direction on the axis passing the center in the circumferential direction of the main body section 61₂and the axis passing the center in the circumferential direction of the main body section 61₄. The jumper wire holding section 63₃is located between the jumper wire holding section 63₂and the jumper wire holding section 63₄located on the circumferential direction other side. The jumper wire holding section 63₅and the jumper wire holding section 63₁coupled to each other are located between the jumper wire holding section 63₄and the jumper wire holding section 63₁located on the circumferential direction other side.

At least one of the jumper wire holding section 63₁, the jumper wire holding section 63₂, the jumper wire holding section 63₃, the jumper wire holding section 63₄, and the jumper wire holding section 63₅is formed shorter in the circumferential direction on the radial direction outer side than in the circumferential direction on the radial direction inner side in the axial direction view. In the present embodiment, the jumper wire holding section 63₂and the jumper wire holding section 63₄are formed shorter in the circumferential direction on the radial direction outer side than in the circumferential direction on the radial direction inner side. Accordingly, in the jumper wire holding sections 63 adjacent to each other in the circumferential direction, the distance on the radial direction outer side is wider than the distance on the radial direction inner side. A gap extending in a direction inclined with respect to the radial direction is formed between the jumper wire holding sections 63 adjacent to each other in the circumferential direction. This gap serves as a passage Q of a nozzle 100 used when the coil 3 is wound around the stator core 2.

The passage Q of the nozzle 100 is defined, between the jumper wire holding sections 63 adjacent to each other in the circumferential direction, by a gap extending in a direction inclined with respect to the radial direction and a gap in the circumferential direction of the locking sections 62 adjacent to each other in the circumferential direction. The passage Q of the nozzle 100 is indicated by a broken line in FIG. 9. In the embodiment, the passage Q is disposed in a direction in which the center line of the passage Q intersects the radial direction.

The passage Q includes a passage Q₁, a passage Q₂, a passage Q₃, and a passage Q₄. When it is not particularly necessary to distinguish the passage Q₁, the passage Q₂, the passage Q₃, and the passage Q₄, the passages are described as the passage Q.

The passage Q₁passes between the jumper wire holding section 63₁and the jumper wire holding section 63₂. The passage Q₁is formed between a straight line L11 and a straight line L12. The straight line L11 is a straight line connecting the end portion on the circumferential direction other side and on the radial direction inner side of the jumper wire holding section 63₁and the end portion on the circumferential direction other side of a locking section 62₄of the main body section 61₄located on the radial direction inner side of the jumper wire holding section 63₄located, on circumferential direction one side, next to the jumper wire holding section 63₅coupled to the jumper wire holding section 63₁. The straight line L12 is a straight line on the extension of the end face on the circumferential direction one side of the jumper wire holding section 63₂.

The passage Q₂passes between the jumper wire holding section 63₂and the jumper wire holding section 63₃. The passage Q₂is formed between a straight line L21 and a straight line L22. The straight line L21 is a straight line on the extension of the end face on the circumferential direction other side of the jumper wire holding section 63₂. The straight line L22 is a straight line connecting the end portion on circumferential direction one side and on the radial direction inner side of the jumper wire holding section 63₃and the end portion on the circumferential direction one side of the locking section 62₄of the main body section 61₄located on the radial direction inner side of the jumper wire holding section 63₄located next to the jumper wire holding section 63₃on the circumferential direction other side.

The passage Q₃passes between the jumper wire holding section 63₃and the jumper wire holding section 63₄. The passage Q₃is formed between a straight line L31 and a straight line L32. The straight line L31 is a straight line connecting the end portion on the circumferential direction other side and on the radial direction inner side of the jumper wire holding section 63₃and the end portion on the circumferential direction other side of a locking section 62₂of the main body section 61₂located on the radial direction inner side of the jumper wire holding section 63₂located next to the jumper wire holding section 63₃on circumferential direction one side. The straight line L32 is a straight line on the extension of the end face on the circumferential direction one side of the jumper wire holding section 63₄.

The passage Q₄passes between the jumper wire holding section 63₄and the jumper wire holding section 63₅. The passage Q₄is formed between a straight line L41 and a straight line L42. The straight line L41 is a straight line on the extension of the end face on the circumferential direction other side of the jumper wire holding section 63₄. The straight line L42 is a straight line connecting the end portion on circumferential direction one side and on the radial direction inner side of the jumper wire holding section 63₅and the end portion on the circumferential direction one side of the locking section 62₂of the main body section 61₂located on the radial direction inner side of the jumper wire holding section 63₂located next to, on the circumferential direction other side, the jumper wire holding section 63₁coupled to the jumper wire holding section 63₅.

The passage Q₁and the passage Q₄intersect between the locking section 62₄of the main body section 61₄located on the radial direction inner side of the jumper wire holding section 63₄and the locking section 62₂located next to the locking section 62₄on the circumferential direction other side. The passage Q₂and the passage Q₃intersect between the locking section 62₂of the main body section 61₂located on the radial direction inner side of the jumper wire holding section 63₂and the locking section 62₄located next to the locking section 62₂on the circumferential direction other side.

The end portion on the circumferential direction one side of the locking section 62₂is located on the extension of the end face on the circumferential direction one side of the jumper wire holding section 63₂. The end portion on the circumferential direction one side of the locking section 62₄is located on the extension of the end face on the circumferential direction one side of the jumper wire holding section 63₄. The end portion on the circumferential direction other side of the locking section 62₂is located on the extension of the end face on the circumferential direction other side of the jumper wire holding section 63₂. The end portion on the circumferential direction other side of the locking section 62₄is located on the extension of the end face on the circumferential direction other side of the jumper wire holding section 63₄.

A space between the jumper wire holding section 63₁and the jumper wire holding section 63₂, a space between the jumper wire holding section 63₂and the jumper wire holding section 63₃, a space between the jumper wire holding section 63₃and the jumper wire holding section 63₄, and a space between the jumper wire holding section 63₄and the jumper wire holding section 63₅are the narrowest on the radial direction inner side. A distance d of a portion where the space between the jumper wire holding section 63₁and the jumper wire holding section 63₂is the narrowest, the distance d of a portion where the space between the jumper wire holding section 63₂and the jumper wire holding section 63₃is the narrowest, the distance d of a portion where the space between the jumper wire holding section 63₃and the jumper wire holding section 63₄is the narrowest, and the distance d of a portion where the space between the jumper wire holding section 63₄and the jumper wire holding section 63₅is the narrowest are a distance that enables the nozzle 100 used when the coil 3 is wound around the stator core 2 to pass. The distance d is, for example, 6.3 mm.

In the present embodiment, in the axial direction view, an interval between the locking sections 62 adjacent to each other in the circumferential direction is, for example, 7.2 mm in the narrowest portion. In the present embodiment, in the axial direction view, an interval between the jumper wire holding sections 63 adjacent to each other in the circumferential direction is, for example, 6.3 mm or more and 6.6 mm or less in the narrowest portion.

An angle θ1 between the end portion on the circumferential direction other side of the jumper wire holding section 63₂and the end portion on the circumferential direction one side of the jumper wire holding section 63₃is, for example, 16.4°. An angle θ2 between the end portion on the circumferential direction other side of the jumper wire holding section 63₃and the end portion on the circumferential direction one side of the jumper wire holding section 63₄is, for example, 9.5°. An angle θ3 between the end portion on the circumferential direction one side of the jumper wire holding section 63₂and the end portion on the circumferential direction one side of the jumper wire holding section 63₃is, for example, 3°. An angle θ4 between the end portion on the circumferential direction other side of the jumper wire holding section 63₃and the end portion on the circumferential direction other side of the jumper wire holding section 63₄is, for example, 5°. An angle θ5 between the end portion on the circumferential direction other side of the jumper wire holding section 63₁and the end portion on circumferential direction one side of the jumper wire holding section 63₃is, for example, 11.5°. An angle θ6 between the end portion on the circumferential direction other side of the jumper wire holding section 63₃and the end portion on circumferential direction one side of the jumper wire holding section 63₅is, for example, 10.5°.

In the present embodiment, in the axial direction view, an angle formed by the end portions facing each other of the jumper wire holding sections 63 adjacent to each other in the circumferential direction is, for example, 9° or more and 17° or less.

The second member 7 of one insulator 5 divided in the circumferential direction is explained with reference to FIG. 10 and FIG. 11. FIG. 10 is a perspective view of the second member of the insulator according to the first embodiment. FIG. 11 is a perspective view of the first member and the second member of the insulator according to the first embodiment. The second member 7 includes a wall section 70, the main body section 71, and the locking section 72. A shape illustrated in FIG. 10 and FIG. 11 is one of a plurality of members obtained by dividing the second member 7 in the circumferential direction. In other words, the members illustrated in FIG. 10 are coupled in the circumferential direction to form the second member 7, a plane shape of which is a ring shape.

The wall section 70 has a shape obtained by dividing a cylinder into a plurality in the circumferential direction. When all wall sections 70 of the second member 7 of the insulator 5 divided in the circumferential direction are connected, the wall section 70 formed in a cylindrical shape.

The main body section 71 protrudes to the radial direction inner side from a surface facing the radial direction inner side of the wall section 70. The main body section 71 is a portion around which the coil 3 is wound.

The main body section 71 is connected to the end portion on the axial direction other side of the main body section 61 of the first member 6. In a state of being assembled with the main body section 61 of the first member 6, the main body section 71 is disposed to cover the teeth 21 of the stator core 2 around which the coil 3 is wound. The main body section 71 is disposed to cover the axial direction other side of the teeth 21.

The locking section 72 restricts the coil 3 from coming off the main body section 71. The locking section 72 is longer on the axial direction other side than the main body section 71 and expands in the circumferential direction. The locking section 72 is disposed on the radial direction inner side of the main body section 71. The locking section 72 is connected to the end portion on the axial direction other side of the locking section 62 of the first member 6.

A path of the nozzle 100 used when the coil 3 is wound around the stator core 2 is explained with reference to FIG. 12 and FIG. 13. FIG. 12 is a schematic diagram for explaining the path of the nozzle. FIG. 13 is a schematic diagram for explaining the path of the nozzle. FIG. 12 and FIG. 13 are schematic diagrams in which the circumferential direction is made linear for explanation. The coil 3 is wound around the integrally assembled stator core 2 using the nozzle 100.

In FIG. 12(a) and FIG. 13(a), the nozzle 100 is located in the radial direction. As illustrated in FIG. 12(a) and FIG. 13(a), the locking section 62 protrudes more greatly compared with the related art. For this reason, when the nozzle 100 enters the main body section 61 side of the insulator 6 in this state, the locking section 62 interferes with the nozzle 100.

Therefore, as illustrated in FIG. 12(b) and FIG. 13(b), the nozzle 100 is inclined obliquely to the radial direction and caused to enter the main body section 61 side of the insulator 6. As illustrated in FIG. 9, the narrowest portion between the jumper wire holding sections 63 adjacent to each other has width equivalent to a distance d that enables the nozzle 100 to pass. Therefore, the nozzle 100 can enter from this gap.

Then, as illustrated in FIG. 12(c) and FIG. 13(c), the nozzle 100 is caused to enter the locking section 62 side of the insulator 6 in a state of being kept obliquely inclined. The nozzle 100 passes between the jumper wire holding sections 63 adjacent to each other and reaches between the locking sections 62 adjacent to each other.

Then, as illustrated in FIG. 12(d) and FIG. 13(d), the nozzle 100 is returned to the direction along the radial direction. The position of the nozzle 100 is moved in order to start winding the coil 3 around the main body section 61.

Then, as illustrated in FIG. 12(e) and FIG. 13(e), the tilt of the nozzle 100 is changed to wind the coil 3 around the main body section 61.

In this way, the coil 3 is wound around the stator core 2.

In the present embodiment, in the axial direction view, at least one of the jumper wire holding sections 63 is formed shorter in the circumferential direction on the radial direction outer side than in the circumferential direction on the radial direction inner side. Accordingly, in the jumper wire holding sections 63 adjacent to each other in the circumferential direction, the distance on the radial direction outer side is wider than the distance on the radial direction inner side. A gap extending in a direction inclined with respect to the radial direction is formed between the jumper wire holding sections 63 adjacent to each other in the circumferential direction. This gap serves as a passage Q of a nozzle 100 used when the coil 3 is wound around the stator core 2. Therefore, according to the present embodiment, an operation of moving the nozzle 100 in the axial direction to avoid the locking section 62 is unnecessary regardless of the height on the radial direction inner diameter side of the locking section 62. According to the present embodiment, it is possible to simplify movement of the nozzle 100 and prevent the jumper wires from coming off.

In the present embodiment, the end portion on the circumferential direction one side of the locking section 62₂is located on the extension of the end face on the circumferential direction one side of the jumper wire holding section 63₂. The end portion on the circumferential direction other side of the locking section 62₂is located on the extension of the end face on the circumferential direction other side of the jumper wire holding section 63₂. In the present embodiment, the end portion on the circumferential direction one side of the locking section 62₄is located on the extension of the end face on the circumferential direction one side of the jumper wire holding section 63₄. The end portion on the circumferential direction other side of the locking section 62₄is located on the extension of the end face on the circumferential direction other side of the jumper wire holding section 63₄. Accordingly, the passage Q of the nozzle 100 can be secured.

As explained above, in the present embodiment, the gap extending in the direction inclined with respect to the radial direction, the gap in the circumferential direction between the locking sections 62 adjacent to each other in the circumferential direction, and the passage Q of the nozzle 100 can be secured between the jumper wire holding sections 63 adjacent to each other in the circumferential direction.

REFERENCE SIGNS LIST

- 1 STATOR
- 2 STATOR CORE
- 21 TOOTH
- 22 SLOT
- 3 COIL
- 3A A-PHASE COIL (FIRST-PHASE COIL)
- 3AT JUMPER WIRE
- 3B B-PHASE COIL (SECOND-PHASE COIL)
- 3BT JUMPER WIRE
- 3C C-PHASE COIL (THIRD-PHASE COIL)
- 3CT JUMPER WIRE
- 5 INSULATOR
- 6 FIRST MEMBER
- 60 WALL SECTION
- 61 MAIN BODY SECTION
- 62 LOCKING SECTION
- 63 JUMPER WIRE HOLDING SECTION
- 64A FIRST GROOVE
- 64B SECOND GROOVE
- 64C THIRD GROOVE
- 7 SECOND MEMBER
- 70 WALL SECTION
- 71 MAIN BODY SECTION
- 72 LOCKING SECTION
- 100 NOZZLE
- AX ROTATION AXIS
- d DISTANCE
- Q PASSAGE.

INSULATOR, STATOR, AND MOTOR

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