PWM inverter control unit

Details PWM inverter control unit PWM inverter control unit

1989-04-20

1991-02-19

Stephan, Steven L.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 98, 318811, H02M 112

Patent

active

049949519

ABSTRACT:
The present invention is achieved with a control unit for a PWM inverter for comparing (8) a voltage command signal (7) with the fundamental of the inverter's output voltage waveform and for comparing (11) the result with a carrier signal (10) and using that result to keep the output voltage waveform equal to the voltage command signal. The use of the output's fundamental for feedback eliminates the prior art need to use slight delays in the inverter's switching stage thereby removing the prior art torque ripple and consequent vibration problems particularly at low speed and furthermore enables smoother stopping and starting control using variable speed ranges of several hundred to one.

REFERENCES:
patent: 4772996 (1988-09-01), Hanei et al.

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