Starting multi-speed motors at a low speed connection

Details Starting multi-speed motors at a low speed connection Starting multi-speed motors at a low speed connection

1991-09-23

1993-03-09

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 72, 318778, 318788, 318792, H02K 1100, H02P 134, H02P 736, H02P 142

Patent

active

051928876

ABSTRACT:
A multi-speed electric motor (1) has a main electrical winding (3) and an auxiliary electrical winding (5) connected in parallel. One additional electrical winding (21) is connected in series with the parallel connected main and auxiliary windings, and another additional electrical winding (23) is connected in series with this third winding. A temperature sensitive resistive element (25) is connected in parallel with at least one of the additional electrical windings. The resistive element improves the motor's starting torque when one or more additional windings are initially connected in the motor circuit as it is started.

REFERENCES:
patent: 3633082 (1972-01-01), Hasegawa
patent: 3821602 (1974-06-01), Linkous
patent: 3879685 (1975-04-01), Epstein et al.
patent: 4119894 (1978-10-01), Sorensen
patent: 4131832 (1978-12-01), Cavil et al.
patent: 4262225 (1981-04-01), Hildebrandt et al.
patent: 4408244 (1983-10-01), Weible
patent: 4772814 (1988-09-01), Lewus

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