Control apparatus for three-phase induction motor

Details Control apparatus for three-phase induction motor Control apparatus for three-phase induction motor

1986-11-21

1988-06-21

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318809, H02P 540

Patent

active

047527250

ABSTRACT:
A three-phase induction motor control apparatus resorting to a slip frequency control type vector control system having three-phase sine wave generating device, first operation device, second operation device, and vector operation device; whereby a current command value and a frequency command value are determined in accordance with a difference between a set velocity and a real velocity to determined a control current value. The three-phase sine wave generating device generates a three-phase sine wave having a frequency according to the frequency command value. The first operation device multiplies one of outputs, which are outputted from the three-phase sine wave generating device and mutually have a phase difference of 120.degree., and a preset value to determine one current component value. The second operation device adds one half of the preset value to the current command value and multiplies this resultant value and the other of the outputs generated from the three-phase sine wave generating device to determine the other current component value. The vector operation device determines the vector sum of those one and other current component values to output it as the control current value.

REFERENCES:
patent: 4306182 (1981-12-01), Curtiss
patent: 4451771 (1984-05-01), Nagase et al.
patent: 4456868 (1984-06-01), Yamamura et al.

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