초록 ▼

A motor with positive torque parking positions. The motor includes a rotor which is rotatable about an axis of rotation and a stator in magnetic coupling relation with the rotor. The stator includes a plurality of teeth each having a radially extending shaft and an axially extending face. The faces

A motor with positive torque parking positions. The motor includes a rotor which is rotatable about an axis of rotation and a stator in magnetic coupling relation with the rotor. The stator includes a plurality of teeth each having a radially extending shaft and an axially extending face. The faces of the stator teeth define an aperture for receiving the rotor and the faces of the stator teeth and the rotor define a air gap therebetween. Each stator tooth has a notch in its face that is approximately at least as wide as the shaft of the stator tooth so that the stator has a magnetic configuration relative to the rotor for parking the rotor in a rest position corresponding to a positive torque starting position. The motor also includes a winding on the shafts of the stator teeth and a control circuit for controlling current in the winding whereby an electromagnetic field is produced for rotating the rotor at a desired speed or torque during the operation of the motor.

대표청구항 ▼

1. A motor comprising:a rotor rotatable about an axis of rotation; a stator in magnetic coupling relation with the rotor, said stator including a plurality of teeth each having a radially extending pole body and an axially extending face, said pole bodies of the stator teeth each having a generally

1. A motor comprising:a rotor rotatable about an axis of rotation; a stator in magnetic coupling relation with the rotor, said stator including a plurality of teeth each having a radially extending pole body and an axially extending face, said pole bodies of the stator teeth each having a generally uniform thickness throughout its radial extent, said faces of the stator teeth defining an aperture for receiving the rotor, said faces of the stator teeth and said rotor defining an air gap therebetween, each stator tooth having a notch in its face which is approximately at least as wide as the thickness of the pole body of the respective stator tooth, said notch defining a modified air gap reluctivity between the stator and the rotor for parking the rotor in a rest position corresponding to a positive torque starting position; a winding on the pole bodies of the stator teeth; and a control circuit for controlling current in the winding whereby an electromagnetic field is produced for rotating the rotor at a desired speed or torque during operation of the motor.