H - Electricity – 02 – M
Patent
H - Electricity
02
M
318/111
H02M 7/538 (2006.01) H02M 7/5387 (2006.01)
Patent
CA 1300676
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.
597227
Iwasa Masao
Kito Yasutami
Gowling Lafleur Henderson Llp
Iwasa Masao
Kito Yasutami
Otis Elevator Company
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