Device for controlling an AC motor

Details Device for controlling an AC motor Device for controlling an AC motor

1990-11-09

1993-04-27

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318829, H02P 528

Patent

active

052065758

ABSTRACT:
In the A.C. electric motor control device of this invention, with the object of improving response to abrupt speed adjustments and load fluctuations, and of improving stability of control under low speed operation, a prescribed current of the inverter circuit is detected and the power factor or power is controlled in accordance with the amount of change in this current.
Specifically, a prescribed current of the inverter circuit is detected and the power factor or power is calculated from this detected current value. Using the result of this calculation, together with a command value, control quantities are calculated that determine the output voltage and output frequency of said inverter circuit. Control signals for the switching elements of said inverter circuit are then generated in accordance with these calculated control quantities.

REFERENCES:
patent: 3723840 (1973-03-01), Opal et al.
patent: 3819992 (1974-06-01), Opal et al.
patent: 4291264 (1981-09-01), Siemon
patent: 4420718 (1983-12-01), Sakai et al.
patent: 4546301 (1985-10-01), Tinebor et al.
patent: 4581568 (1986-04-01), Fitzpatrick et al.
patent: 4590413 (1986-05-01), Gritter et al.
patent: 5010287 (1991-04-01), Mukai et al.

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