Resolver stator

1. A resolver stator comprising:

a stator core comprising a ring-shaped stator core main body, and a plurality of tooth parts protruding radially inward from the stator core main body;

an insulator disposed radially inward with respect to the stator core main body;

a plurality of coils wound around the plurality of tooth parts, respectively; and

at least one connecting wire configured to electrically connect the plurality of coils to one another, wherein

the insulator comprises an insulator main body having an insulator main body inner surface facing radially inward, and a protruding part protruding radially inward beyond the insulator main body inner surface, and

the at least one connecting wire is disposed so as to be opposed to the protruding part in a direction parallel to a rotation axis of the resolver stator and also opposed to the insulator main body inner surface in a direction perpendicular to the rotation axis,

the insulator further comprises a holding protrusion protruding from the protruding part in the direction parallel to the rotation axis, and

the at least one connecting wire is disposed between the insulator main body inner surface and the holding protrusion.

2. The resolver stator according to claim 1 , wherein

the at least one connecting wire touches the protruding part in the direction parallel to the rotation axis.

3. The resolver stator according to claim 1 , wherein

the insulator main body inner surface is formed as a plane surface.

4. The resolver stator according to claim 1 , wherein

the insulator further comprises at least one access passage for allowing the at least one connecting wire to be wired to an opposite side of the protruding part without getting over the protruding part.

5. The resolver stator according to claim 4 , wherein

the at least one access passage comprises two access passages, and

both ends of the at least one connecting wire are wired to the opposite side of the protruding part through the two access passages respectively.

6. The resolver stator according to claim 1 , wherein

the insulator main body inner surface has a first insulator main body inner surface and a second insulator main body inner surface adjacent to each other in a circumferential direction,

each of the first and second insulator main body inner surfaces is formed as a plane surface, and

an angle between the first and second insulator main body inner surfaces is smaller than 180 degrees.

7. The resolver stator according to claim 6 , wherein the holding protrusion is disposed near an intersection or an imaginary intersection of the first and second insulator main body inner surfaces.

8. The resolver stator according to claim 1 , wherein

the at least one connecting wire comprises a plurality of connecting wires, and

between two of the coils that are adjacent to each other in a circumferential direction, the plurality of connecting wires are disposed so as to be opposed to the protruding part in the direction parallel to the rotation axis and also opposed to the insulator main body inner surface in the direction perpendicular to the rotation axis, while being piled up on each other in a bundle-like manner.

9. The resolver stator according to claim 1 , wherein

the at least one connecting wire comprises a plurality of connecting wires,

the insulator further includes an additional protruding part protruding radially inward beyond the protruding part, and

between two of the coils that are adjacent to each other in a circumferential direction, one of the connecting wires is disposed so as to be opposed to the protruding part in the direction parallel to the rotation axis and also opposed to the insulator main body inner surface in the direction perpendicular to the rotation axis, and another of the connecting wires is disposed so as to be opposed to the additional protruding part in the direction parallel to the rotation axis and also opposed to the protruding part in the direction perpendicular to the rotation axis.

10. A resolver stator comprising:

a stator core comprising a ring-shaped stator core main body, and a plurality of tooth parts protruding radially inward from the stator core main body;

an insulator disposed radially inward with respect to the stator core main body;

a plurality of coils wound around the plurality of tooth parts respectively; and

at least one connecting wire configured to electrically connect the plurality of coils to one another, wherein

the insulator comprises an insulator main body having an insulator main body inner surface facing radially inward, and a protruding part protruding radially inward beyond the insulator main body inner surface, and

the at least one connecting wire is disposed so as to be opposed to the protruding part in a direction parallel to a rotation axis of the resolver stator and also opposed to the insulator main body inner surface in a direction perpendicular to the rotation axis,

the insulator further comprises at least one access passage for allowing the at least one connecting wire to be wired to an opposite side of the protruding part without getting over the protruding part,

the at least one access passage comprises two access passages, and

both ends of the at least one connecting wire are wired to the opposite side of the protruding part through the two access passages respectively.

11. A resolver stator comprising:

a stator core comprising a ring-shaped stator core main body, and a plurality of tooth parts protruding radially inward from the stator core main body;

an insulator disposed radially inward with respect to the stator core main body;

a plurality of coils wound around the plurality of tooth parts respectively; and

at least one connecting wire configured to electrically connect the plurality of coils to one another, wherein

the insulator comprises an insulator main body having an insulator main body inner surface facing radially inward, and a protruding part protruding radially inward beyond the insulator main body inner surface, and

the at least one connecting wire is disposed so as to be opposed to the protruding part in a direction parallel to a rotation axis of the resolver stator and also opposed to the insulator main body inner surface in a direction perpendicular to the rotation axis,

the insulator main body inner surface has a first insulator main body inner surface and a second insulator main body inner surface adjacent to each other in a circumferential direction,

each of the first and second insulator main body inner surfaces is formed as a plane surface, and

an angle between the first and second insulator main body inner surfaces is smaller than 180 degrees.

12. The resolver stator according to claim 11 , wherein

the insulator further comprises a holding protrusion protruding from the protruding part in the direction parallel to the rotation axis, and

the at least one connecting wire is disposed between the insulator main body inner surface and the holding protrusion.

13. The resolver stator according to claim 12 , wherein the holding protrusion is disposed near an intersection or an imaginary intersection of the first and second insulator main body inner surfaces.