Electricity: motive power systems – Induction motor systems – Braking
Patent
1976-10-13
1979-03-20
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Braking
318777, 361 29, H02P 324, H02P 748
Patent
active
041456459
ABSTRACT:
There is disclosed a squirrel-cage motor for a winch drive or other application and control means for operating the motor in hoist or lower directions at any one of a plurality of speeds in either direction. The motor and winch are provided with a load brake. In one embodiment, the stator comprises two stator windings having different numbers of poles to provide high speed (fewer poles) and low speed (more poles) windings. The control means comprises a direct current power source, an alternating current power source, means for connecting the sources to the stator windings so that different speed points and braking operations are achieved, and means for operating the load brake. Low speed results from simultaneously energizing the low speed winding and the high speed winding from the alternating current power source and the direct current power source, respectively. Intermediate speed results from energizing only the low speed winding from the alternating current power source. High speed results from energizing only the high speed winding from the alternating current power source.
The control means includes time delay means to prevent connection of the alternating current source to the winding previously energized from the direct current source until arcing across a direct current contactor in the control means ceases during transition from low speed to higher speed.
REFERENCES:
patent: 2677087 (1954-04-01), Willmott
patent: 2740932 (1956-04-01), King
patent: 2793339 (1957-05-01), Rhyne, Jr.
patent: 2816258 (1957-12-01), Norman
patent: 2840772 (1958-06-01), Seely
patent: 2847630 (1958-08-01), Holt et al.
patent: 3011594 (1961-12-01), Borden
patent: 3166701 (1965-01-01), Bohn
patent: 3281633 (1966-10-01), Jensen
patent: 3368073 (1968-02-01), Baughman
patent: 3721832 (1973-03-01), Lee
patent: 3786327 (1974-01-01), Dyer
patent: 3864611 (1975-02-01), Chang
patent: 3919600 (1975-11-01), Sons
Millonzi Lawrence A.
Price Lester A.
Schmid Gerold E.
Harnischfeger Corporation
Indyk Eugene S.
Nilles James E.
Rubinson Gene Z.
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