Method and apparatus for controlling induction motor

Details Method and apparatus for controlling induction motor Method and apparatus for controlling induction motor

1982-11-15

1984-03-13

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318811, H02P 540

Patent

active

044370512

ABSTRACT:
Disclosed is a method and apparatus for operating an induction motor by an inverter of the pulse-width modulation (PWM) type, wherein the slip frequency is calculated from the speed command and the actual motor speed so as to produce the phase compensation signal, and the frequency command for the inverter is produced by adding the phase compensation signal, the slip frequency signal and the motor speed signal. The primary current command is calculated from the slip frequency, the amplitude ratio of pulse-width modulation is calculated basing on the primary current command and the actual primary current, and the inverter is controlled in accordance with the amplitude ratio so as to control the primary current of the induction motor.

REFERENCES:
patent: 4310791 (1982-01-01), Akamatsu

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