Methods and apparatus for speed-control of induction motors

Details Methods and apparatus for speed-control of induction motors Methods and apparatus for speed-control of induction motors

1975-01-31

1977-02-15

Rubinson, Gene Z.

Electricity: motive power systems

With flywheel or massive rotary member

318230, 318231, 321 4, 321 6, H02P 534

Patent

active

040084213

ABSTRACT:
A method of energizing a single-, three-, or poly-phase A.C. motor for continuously-variable speed control from a fixed-frequency supply of corresponding phase. Each phase is modulated by a continuously-variable modulation wave of sub-supply frequency to provide two continuously-variable sideband frequencies, either of which can be used to supply the motor. The modulation wave is sampled in each cycle of the A.C. supply and a full-wave rectified resultant modulation wave compared with a cosine wave of supply frequency. Each phase is gated by solid-state switch means for current flow from amplitude equality to next-following cosine zero. Optionally, secondary modulation, by a square wave of supply frequency, is used.

REFERENCES:
patent: 3353081 (1967-11-01), Stemmler
patent: 3387195 (1968-06-01), Piccand et al.
patent: 3470447 (1969-09-01), Gyugyi et al.
patent: 3493838 (1970-02-01), Gyugyi et al.
patent: 3703672 (1972-11-01), Bird et al.

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