Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-05-24
1984-07-10
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318803, 318811, H02P 540
Patent
active
044595344
ABSTRACT:
A control apparatus for induction motor comprising an induction motor driven by a power converter, a circuit for producing an effective current command value for the induction motor on the basis of a speed command value and an actual speed value, a circuit for producing a slip frequency corresponding to the magnitude of the effective current command value, and a circuit for producing a primary frequency command value on the basis of the slip frequency and the actual speed value, the output of the power converter being controlled on the basis of the frequency command value, the effective current command value and a given exciting current or voltage command value, wherein the control apparatus further comprises a current component detecting circuit for detecting the primary current of the induction motor so as to produce in the form of a DC signal an actual effective current value which is an effective component of the detected primary current, a first current control circuit for producing an effective voltage command value in the form of a DC signal on the basis of the actual effective current value and the effective current command value, and a converter controlling circuit for controlling the power converter to produce output on the basis of the effective voltage command value, the frequency command value, and a given exciting voltage command value in the form of a DC signal. The current component detecting circuit preferably further produces in the form of a DC signal an actual exciting current value which is an exciting component of the detected primary current, and the controlling apparatus may further comprise a second current controlling circuit for producing the exciting voltage command value on the basis of the actual exciting current value and the predetermined exciting current command value.
REFERENCES:
patent: 4310791 (1982-01-01), Akamatsu
patent: 4322671 (1982-03-01), Kawada et al.
patent: 4356544 (1982-10-01), Ono et al.
patent: 4364109 (1982-12-01), Okado et al.
patent: 4377779 (1983-03-01), Plunkett
Nagase Hiroshi
Okuyama Toshiaki
Hitachi , Ltd.
Smith Jr. David
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