Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Patent
1993-07-07
1995-07-18
Cabeca, John W.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
318 77, 318 85, H02P 768
Patent
active
054344867
ABSTRACT:
In a synchronous operation system, rotating positions of two rotating elements MSP and SSP driven by induction motors IM.sub.1 and IM.sub.2 are maintained in a predetermined positional relation, what is called, a synchronous control by a position adjuster 7. A gain compensating circuit 10 for adjusting an output of the position adjuster 7 by using a detected speed of one rotation element SSP as a parameter is provided, and the gain compensating circuit 10 adjusts the output of the position adjuster 7. Thus, a slippage of the induction motor is compensated in a speed region where the position variation of the two rotating elements becomes excessively large, or in a high speed region (constant output region) exceeding a basic rotation speed in case the synchronous control is carried out by using an induction motor and an invertor for controlling a primary frequency of the induction motor.
REFERENCES:
patent: 4016735 (1977-04-01), Peterson
patent: 4448368 (1984-05-01), Shalko
patent: 4728806 (1988-03-01), Baker et al.
patent: 5222022 (1993-06-01), Adams et al.
patent: 5252900 (1993-10-01), Uehara et al.
Cabeca John W.
Fuji Electric & Co., Ltd.
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