Method and apparatus for controlling PWM inverter

Details Method and apparatus for controlling PWM inverter Method and apparatus for controlling PWM inverter

1984-02-27

1986-09-09

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318811, 318798, H02P 540

Patent

active

046111581

ABSTRACT:
An AC motor such as an induction motor or a synchronous motor is driven by a PWM inverter. Turn-on of the PWM inverter is controlled by PWM pulse signals obtained as a result of comparison between voltage command signals (a modulation signal) and a carrier wave signal. The voltage command signals are obtained as a function of errors between current command signals and detected current signals. Ripples included in the voltage command signals are so suppressed as to be decreased as the rotation speed of the AC motor becomes lower. By so suppressing the ripples, the level of noise generated from the motor can be reduced especially when the motor operates in a low-speed rotation range.

REFERENCES:
patent: 3859585 (1975-01-01), Meier
patent: 4240020 (1980-12-01), Okuyama et al.
patent: 4322671 (1982-03-01), Kawada et al.
patent: 4354223 (1982-10-01), Turnbull
patent: 4364109 (1982-12-01), Okado et al.
patent: 4387421 (1983-06-01), Zach et al.
patent: 4409534 (1983-10-01), Bose
patent: 4458192 (1984-07-01), Sakamoto et al.

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