Control circuit for A.C. induction motor

Details Control circuit for A.C. induction motor Control circuit for A.C. induction motor

1979-03-28

1981-11-10

Dobeck, B.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318814, H02P 516

Patent

active

043000860

ABSTRACT:
The voltage and frequency of an A.C. excitation signal applied to the stator windings of an A.C. induction motor are varied in proportion to the amplitude of current flowing in the stator windings. The stator current flow is sensed by a feedback resistor in series with the inverter which generates the A.C. excitation signal for the stator windings. The voltage drop aross the feedback resistor is summed with a VELOCITY COMMAND voltage which indicates the desired speed of the motor and the summed voltage controls the frequency and the amplitude of the A.C. excitation voltage in a constant volts per hertz manner. The stator current feedback holds the motor speed constant in spite of variations in the load on the motor.

REFERENCES:
patent: 3584279 (1971-06-01), Krauthamer
patent: 3619749 (1971-11-01), Schieman
patent: 3748556 (1973-07-01), Gillett
patent: 3764872 (1973-10-01), Boice
patent: 4099108 (1978-07-01), Okawa et al.

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