Induction motor driving system

Details Induction motor driving system Induction motor driving system

1985-05-02

1987-07-14

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, H02P 540

Patent

active

046805257

ABSTRACT:
The drive system of an induction motor wherein the exciting current command value I.sub.o of the induction motor (14) is held constant and the rotational speed thereof is caused to quickly respond to a command speed by the vector control circuit the induction motor (104) has exceeded a predetermined speed, an exciting current amplitude-controlling circuit (51) increases the exciting current command value in accordance with the rotational speed. The level of the driving supply voltage of the induction motor is sensed by a supply voltage output circuit (52), whereupon the exciting current amplitude-controlling circuit (51) is controlled so that the predetermined speed serving as a threshold value for changing the exciting current command value may be increased in accordance with the sensed level.

REFERENCES:
patent: 3551779 (1970-12-01), Campbell
patent: 4047083 (1977-09-01), Plunkett
patent: 4099108 (1978-07-01), Okawa et al.
patent: 4263541 (1981-04-01), Okado
patent: 4361794 (1982-11-01), Kawada et al.
patent: 4384244 (1983-05-01), Matsumoto

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