Motor with multiple bus rings
An aspect of the invention provides a motor that comprises: a stator including multiple motor coils; multiple bus rings configured to distribute currents of different phases to the motor coils; and a ring-shaped bus ring holder in which multiple holding grooves configured to hold the respective bus rings are formed, wherein: each of the motor coils includes an insulator around which a wound wire is wound; the insulator includes an outer flange formed at an outer side of the wound wire in a radial direction of the motor and extending in an axial direction of the motor; and the bus ring holder is arranged at an outer side of the outer flange in the radial direction of the motor, and contiguous to the outer flange.
1. A motor comprising:
a stator including a plurality of motor coils;
a plurality of bus rings configured to distribute currents of a plurality of different phases to the motor coils; and
a ring-shaped bus ring holder in which a plurality of holding grooves configured to hold the respective bus rings are formed,
wherein each of the motor coils includes an insulator around which a wound wire is wound,
the insulator includes an outer flange formed at an outer side of the wound wire in a radial direction of the motor and extending in an axial direction of the motor, and
the bus ring holder is arranged at an outer side of the outer flange in the radial direction of the motor, and contiguous to the outer flange.
2. The motor of claim 1 , wherein
the outer flange has a surface part opposed to the bus ring holder, and
the opposed surface part curves along a ring-shaped form of the bus ring holder.
3. The motor of claim 1 , further comprising:
teeth each extending in the radial direction of the motor and inserted into one of the insulators; and
a yoke arranged at an outer side of the insulators in the radial direction of the motor and connected to a first end part of each of the teeth, wherein
the bus ring holder is arranged contiguous to the yoke in the axial direction of the motor.
4. The motor of claim 3 , wherein
the insulator includes an inner flange at an inner side of the wound wire in the radial direction of the motor,
the yoke is press-fit to the teeth, and
an end part of the inner flange in a press-fitting direction in which the yoke is press-fit to the teeth is located at an outer side of a second end part of a corresponding tooth in the radial direction of the motor.
5. The motor of claim 1 , wherein
each bus ring comprises:
an inserted part inserted into a corresponding holding groove; and
a wound-wire connecting terminal extending inward from the inserted part in the radial direction of the motor, and connected to an end part of the wound wire, and
the wound-wire connecting terminal includes a cutout part that holds the end part of the wound wire.
6. The motor of claim 5 , wherein
the wound-wire connecting terminal is shaped like a plate,
the end part of the wound wire is connected to a surface of the wound-wire connecting terminal, and
the wound-wire connecting terminal has a concave part on the surface in a portion where the surface contacts the end part of the wound wire.
7. The motor of claim 5 , wherein
the end part of the wound wire extends from the insulator toward the wound-wire connecting terminal, and
the cutout part is formed in an end portion of the wound-wire connecting terminal in a direction in which the end part of the wound wire extends.
8. The motor of claim 1 , wherein
each of the bus rings comprises:
a ring-shaped part formed in a circumferential direction of the motor;
a current supplying end part positioned at an outer side of the ring-shaped part in the radial direction of the motor and configured to supply one of the currents of different phases; and
a folded part continuing to the current supplying end part and the ring-shaped part, and folded along an axial direction of the motor.
9. The motor of claim 1 , wherein
the bus ring holder and the insulators are a single unit.