Control apparatus for induction motor

Details Control apparatus for induction motor Control apparatus for induction motor

1995-04-21

1996-07-02

Cabeca, John W.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318799, 318806, H02P 540

Patent

active

055325718

ABSTRACT:
The invention provides a control apparatus for an induction motor to maintain torque following controllability even with use of inexpensive speed detection units having detection delay. In a control unit, a phase correction arithmetic circuit uses a motor speed detection value detected by a speed sensor and a low-pass filter and a detection delay time of a control system to compute a correction phase. An adder adds the correction phase to a magnetic flux phase obtained by a vector control computation. The addition corrects a magnetic flux phase deviation due to detection delay of the correction phase of a primary current command, and compensates for the detection delay so as to maintain the torque following controllability of an inductor motor.

REFERENCES:
patent: 4673858 (1987-06-01), Saito
patent: 4780650 (1988-10-01), Miyazaki et al.
patent: 4823066 (1989-04-01), Yoshiki et al.
patent: 5003243 (1991-03-01), Tadakuma et al.
patent: 5387855 (1995-02-01), Miyazaki et al.

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