Pulse width modulated inverter machine drive

Details Pulse width modulated inverter machine drive Pulse width modulated inverter machine drive

1980-12-29

1983-03-22

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318802, 363 41, H02P 540

Patent

active

043777791

ABSTRACT:
Improved operation of a pulse width modulated inverter machine drive system is obtained by a control apparatus which regulates inverter switching device conduction by modifying switching signal waveforms transmitted to the inverter to eliminate switching pulses narrower than the minimum inverter switching device pulse width. By dropping the narrow inverter switching pulses in sequence during the exact interval which the pulses would otherwise occur and boosting the amplitude of remaining pulses, the control apparatus permits the inverter to smoothly transition from pulse width modulation operation to square wave operation without objectionable jumps in inverter output voltage.

REFERENCES:
patent: 3819992 (1974-06-01), Opal et al.
patent: 4047083 (1977-09-01), Plunkett
patent: 4295189 (1981-10-01), Boys
patent: 4320331 (1982-03-01), Plunkett
patent: 4333042 (1982-06-01), Kawada et al.
"Direct Flux and Torque Regulation in a PWM Inverter-Induction Motor Drive", A. B. Plunkett; IEEE Industry Applications, vol. 1A-13, No. 2; 4/77, pp. 139-146.
G. B. Kliman & A. B. Plunkett, "Development of a Modulation Strategy for a PWM Inverter Drive", IAS '75 ANNUAL.

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