Variable speed drive for induction motor

Details Variable speed drive for induction motor Variable speed drive for induction motor

1975-05-29

1976-11-09

Rubinson, Gene Z.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318227, 321 7, H02P 742

Patent

active

039913546

ABSTRACT:
A variable speed drive is provided for a polyphase induction motor. The motor is connected through a contactor to a constant frequency polyphase alternating current power source for starting and for full speed operation but is supplied by a variable frequency source in a single phase operating mode when reduced speed levels are desired. In the single phase operating mode, low speed operation is provided by driving the motor with a cycloconverter which converts power from the polyphase source to single phase alternating current of a predetermined lower frequency. The motor speed decreases from a higher level to a lower level by coasting, with gate signals of the cycloconverter suppressed until a desired lower speed is reached. Initiation of contactor and cycloconverter operation is coordinated by motor speed sensing means.

REFERENCES:
patent: 3527995 (1970-09-01), Lee et al.
patent: 3803478 (1974-04-01), Honey

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