Variable-speed control method and apparatus for AC motor

Details Variable-speed control method and apparatus for AC motor Variable-speed control method and apparatus for AC motor

1997-04-14

1999-03-09

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318814, H02P 742

Patent

active

058805729

ABSTRACT:
A variable-speed control apparatus computes the leakage inductance of an AC motor, correctly compensates the leakage inductance, and controls the variable speed of the AC motor. The variable-speed control apparatus has an AC signal generation circuit for generating an AC signal, and obtains a leakage inductance calculation value of the AC motor based on the AC signal and the measured actual current value. The differential value of the summation of a current command value and the AC signal is multiplied by the leakage inductance calculation value to generate a signal for use in compensating the voltage drop caused by the leakage inductance, and added to a voltage command value to cancel the deviation between the actual current value and the M-axis current command value and to obtain the second voltage command value. The second voltage command value is converted into a 3-phase voltage command value and used in controlling the AC motor, and the voltage drop caused by the leakage inductance can be compensated.

REFERENCES:
patent: 4967135 (1990-10-01), Ashikaga et al.
patent: 5481173 (1996-01-01), Yamamoto
patent: 5594670 (1997-01-01), Yamamoto
patent: 5598081 (1997-01-01), Okamura et al.
patent: 5644206 (1997-07-01), Yura

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