Shifted pole single phase variable reluctance motor

Details Shifted pole single phase variable reluctance motor Shifted pole single phase variable reluctance motor

1991-08-20

1994-03-15

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68B, 310259, 310168, H02K 2138

Patent

active

052948560

ABSTRACT:
A hybrid single-phase variable reluctance motor (31) has a stator (33) having a plurality of inwardly salient teeth (41A-41D) terminating at a central bore (37). The teeth are arranged in generally diametrically opposed pairs of teeth and are generally evenly spaced around the bore. A phase winding (43) is operatively associated with one pair of the stator teeth. The winding, when energized, causes a temporary magnetization of the stator teeth. A rotor (35) is disposed for rotation in the bore and has outwardly salient teeth (45A, 45B) generally diametrically opposed to each other. A permanent magnet (53) is disposed adjacent the bore at the end of one tooth (41D) of a second pair (41C, 41D) of stator teeth. One tooth (41D) of the second pair of stator teeth is offset with respect to a longitudinal axis (A.sub.1) of the second pair of teeth. This offset acts to eliminate a stable detent position in which the rotor could otherwise "park" itself when it stops running. Parking in such a position makes it difficult to restart the motor.

REFERENCES:
patent: 3604961 (1971-09-01), Saldinger
patent: 3978356 (1976-08-01), Spiesberger
patent: 4642494 (1987-02-01), Lundin et al.
patent: 4940912 (1990-07-01), Kant et al.
patent: 5015903 (1991-05-01), Hancock et al.
patent: 5122697 (1992-06-01), Horst

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