Motor and electric power steering apparatus
A motor includes a rotor, a stator surrounding an outer side of the rotor in a radial direction and including a coil, and a bus bar of a wire electrically connected to the coil and having conductivity, wherein the stator is provided with a hole extending in an axial direction, the bus bar includes stretched portions extending in the axial direction, and each of the stretched portions is disposed in the hole.
1. A motor comprising:
a rotor;
a stator surrounding an outer side of the rotor in a radial direction and including a coil; and
a bus bar of a wire electrically connected to the coil and having conductivity; wherein
the stator is provided with a hole extending in an axial direction;
the bus bar includes a stretched portion extending in the axial direction;
the stretched portion is disposed in the hole;
the stator includes a stator core and an insulator having an electrically insulating property and covering at least a portion of the stator core;
the insulator includes a body portion and a flange portion;
the flange portion protrudes in the radial direction from the body portion;
an uppermost end surface of the flange portion is higher than an uppermost portion of the coil in the axial direction, the hole being defined in the flange portion; and
the coil is defined by a portion of a coil wire which is wound around the stator core via the insulator.
2. The motor of claim 1 , wherein
the stator core includes a core back having an annular shape and a plurality of teeth extending inwardly in the radial direction from the core back.
3. The motor of claim 2 , wherein the hole is located on an outer side of each of the teeth in the radial direction.
4. The motor of claim 2 , wherein
the stator core includes a split core that is split in a circumferential direction;
the insulator includes a split body provided on each split core; and
the hole is located in each of the split bodies.
5. The motor of claim 4 , wherein two of the holes are provided in each of the split bodies.
6. The motor of claim 1 , wherein
the bus bar includes a coil connection portion connected to the coil; and
the coil connection portion has a U-shape recessed outwardly or inwardly in the radial direction.
7. The motor of claim 6 , wherein the coil connection portion is recessed inwardly in the radial direction.
8. The motor of claim 6 , wherein the bus bar includes a plurality of the coil connection portions and the coil is defined by a plurality of the coil wires which are wound around the stator core via the insulator.
9. The motor of claim 1 , wherein the bus bar is a neutral point bus bar.
10. The motor of claim 1 , wherein a gap is located between the hole and the stretched portion.
11. The motor of claim 1 , wherein a portion of the flange portion is directly radially outward from a portion of the coil.
12. The motor of claim 11 , wherein a portion of the hole is directly radially outward from the portion of the coil.
13. An electric power steering apparatus comprising:
a motor comprising:
a rotor;
a stator surrounding an outer side of the rotor in a radial direction and including a coil; and
a bus bar of a wire electrically connected to the coil and having conductivity;
wherein the stator is provided with a hole extending in an axial direction;
the bus bar includes a stretched portion extending in the axial direction; and
the stretched portion is disposed in the hole;
the stator includes a stator core and an insulator having an electrically insulating property and covering at least a portion of the stator core;
the insulator includes a body portion and a flange portion;
the flange portion protrudes in the radial direction from the body portion;
an uppermost end surface of the flange portion is higher than an uppermost portion of the coil in the axial direction, the hole being defined in the flange portion; and
the coil is defined by a portion of a coil wire which is wound around the stator core via the insulator.