Motor having a highly reliable grounding structure and electric equipment on which the motor is mounted
View Patent ↗This motor has a stator formed by integrally molding a stator core, a stator winding wound around the stator core, and a grounding terminal mounted on the stator winding by insulating resin. The motor has a rotor provided with a shaft, a bracket mounting a bearing for supporting the shaft, and a conductive pin press fit in at least one hole having a predetermined diameter provided in the teeth of the stator core. The pin and the grounding terminal are electrically connected to each other.
1. A toroidal motor comprising:
a stator including
a stator core having a yoke and a plurality of teeth extending from an inside circumference of the yoke, the stator core having a slot therein,
a stator winding wound on the yoke of the stator core toward an outside circumference of the yoke from the slot in the stator core,
a grounding terminal mounted on the stator winding, the grounding terminal having a first end protruding toward the outside circumference of the yoke, and
a conductive pin electrically connecting the grounding terminal to the stator core;
a rotor provided with a shaft; and
a bracket for receiving a bearing which rotatably supports the shaft,
wherein at least one hole is provided in the stator core, the hole having a predetermined diameter and being provided in a tooth of the plurality of teeth of the stator core,
wherein a first end of the conductive pin is press fitted in the hole and a second end of the conductive pin is connected with a second end of the grounding terminal,
wherein the grounding terminal extends along the yoke from the second end connected to the conductive pin so that a side of the grounding terminal faces the yoke, and
wherein the stator is formed by integrally molding the stator core, the stator winding, the grounding terminal, and the conductive pin with an insulating resin.
2. The motor as defined in claim 1 , wherein the predetermined diameter of the hole is no less than 20% and no more than 40% of a dimension of the width of one of the teeth.
3. The motor as defined in claim 1 , further comprising a connector mounted on the stator winding, wherein one side of the grounding terminal protrudes to outside of the connector via a terminal of the connector.
4. The motor as defined in claim 3 , wherein a part of the connector is integrally molded by insulating resin.
5. An electric device comprising:
the motor as defined in claim 1 ; and
a unit powered by the motor.
6. An electric device comprising:
the motor as defined in claim 2 ; and
a unit powered by the motor.
7. An electric device comprising:
the motor as defined in claim 3 ; and
a unit powered by the motor.
8. An electric device comprising:
the motor as defined in claim 4 ; and
a unit powered by the motor.
9. The motor as defined in claim 1 , wherein the grounding terminal includes a portion in a shape of a crank.
10. The motor as defined in claim 4 , wherein a tip of the first end of the grounding terminal protrudes to the outside of the insulating resin via the connector.