Brushless D.C. motor having asymmetrically positioned poles

Details Brushless D.C. motor having asymmetrically positioned poles Brushless D.C. motor having asymmetrically positioned poles

1982-08-06

1984-07-03

Rubinson, G. Z.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 310 46, H02K 2902

Patent

active

044581840

ABSTRACT:
A brushless DC motor has a rotor which is partially magnetized. The magnetized portion of the rotor extends in a circumferential arc of approximately 180.degree. and has a first magnetic polarity (either north or south polarity). The stator of the brushless DC motor has two pairs of asymmetrically positioned poles. The first pair of poles are circumferentially spaced from one another by an angle which is greater than 180.degree.. Similarly, the second pair of poles are circumferentially spaced from one another at an angle greater than 180.degree.. First and second windings are wound on the first and second pairs of poles, respectively. A magnetic sensor senses the angular position of the magnetized portion of the rotor and provides a signal to a control circuit, which alternately energizes the first and second windings in synchronism with the sensed angular position of the rotor. The torque generated is greater than the 180.degree. angle, and no point of zero torque exists. The motor, therefore, can be stopped at any position and restarted even though only a single magnetic sensor is used.

REFERENCES:
patent: 3486099 (1969-12-01), Brunner et al.
patent: 3873897 (1975-03-01), Muller
patent: 4217508 (1980-08-01), Uzuka
patent: 4371817 (1983-02-01), Muller

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