PWM inverter controller for starting and driving an AC motor

Details PWM inverter controller for starting and driving an AC motor PWM inverter controller for starting and driving an AC motor

1987-02-03

1988-07-19

Salce, Patrick R.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

318811, H02M 112

Patent

active

047589388

ABSTRACT:
A first memory stores first PWM control signal pattern data being calculated in advance according to the sine-triangle wave comparison modulation system in the frequency region below a predetermined frequency, for each of predetermined frequency intervals. A second memory stores second PWM control signal pattern data being calculated in advance according to the harmonic removal pattern modulation system in the frequency region above the predetermined frequency for each of predetermined frequency intervals. A frequency designating section supplies frequency designating data. A controller reads out, when receiving the frequency designating data, either the first or second PWM control signal pattern data in accordance with the frequency designating data, from the first or second memory. An inverter outputs a predetermined AC power in accordance with the read-out first or second PWM control signal pattern data. An AC motor is variably speed driven in accordance with the frequency designating data, when receiving the predetermined AC power from the inverter.

REFERENCES:
patent: 4047083 (1977-09-01), Plunkett
patent: 4086623 (1978-04-01), Jensen
patent: 4338558 (1982-07-01), Okamatsu et al.
patent: 4377779 (1983-03-01), Plunkett
patent: 4409534 (1983-10-01), Bose
patent: 4410937 (1983-10-01), Uesugi
IEEE Transactions on Industry Applications, vol. IA-21, No. 4, May/Jun. 1985, pp. 580-587.
The Transactions of the Institute of Electric Engineers of Japan (Denki-Gakkai) vol. 7, 590, 591-H. Mochikawa et al, (Technological University of Nagaoka).

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