Control apparatus for an induction motor

Details Control apparatus for an induction motor Control apparatus for an induction motor

1987-10-07

1988-11-15

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318778, H02P 130

Patent

active

047852259

ABSTRACT:
A control apparatus for an induction motor comprises a variable voltage, variable frequency inverter feeding the motor, which is controlled by the PWM control. A secondary current component and an exciting current component of the motor are obtained by the calculation on the basis of a motor current and an actual slip frequency of the motor. From the thus obtained secondary current component, an actual torque produced by the motor is calculated. A frequency reference for the PWM control is obtained by the comparison result of the actual torque and a torque reference. A modulation factor reference for the PWM control is obtained by the comparison of the exciting current component and an exciting current reference. According to this control apparatus, the torque of the induction motor can be controlled to follow the torque reference with a high accuracy.

REFERENCES:
patent: 4501343 (1985-02-01), Salihi
patent: 4671389 (1987-06-01), Tanahasi

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