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Methods, systems and apparatus for adjusting duty cycle of pulse width modulated (PWM) waveforms

United States Patent

May 21, 2013
View the Complete Patent at the US Patent & Trademark Office
Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase machine operates in an overmodulation region. The disclosed embodiments provide a mechanism for adjusting a duty cycle of PWM waveforms so that the correct phase voltage command signals are applied at the angle transitions. This can reduce variations/errors in the phase voltage command signals applied to the multi-phase machine so that phase current may be properly regulated thus reducing current/torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.
Gallegos-Lopez; Gabriel (Lomita, CA), Kinoshita; Michael H. (Redondo Beach, CA), Ransom; Ray M. (Big Bear City, CA), Perisic; Milun (Torrance, CA)
GM Global Technology Operations LLC (Detroit, MI)
12/ 983,669
January 3, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under DE-FC26-07NT43123, awarded by the US-Department of Energy. The Government has certain rights in this invention.