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Methods, systems and apparatus for controlling third harmonic voltage when operating a multi-phase machine in an overmodulation region

United States Patent

8,742,712
June 3, 2014
View the Complete Patent at the US Patent & Trademark Office
Methods, system and apparatus are provided for controlling third harmonic voltages when operating a multi-phase machine in an overmodulation region. The multi-phase machine can be, for example, a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided. For example, when the reference voltage vector is determined to be within the overmodulation region, an angle of the reference voltage vector can be modified to generate a reference voltage overmodulation control angle, and a magnitude of the reference voltage vector can be modified, based on the reference voltage overmodulation control angle, to generate a modified magnitude of the reference voltage vector. By modifying the reference voltage vector, voltage command signals that control a five-phase inverter module can be optimized to increase output voltages generated by the five-phase inverter module.
Perisic; Milun (Torrance, CA), Kinoshita; Michael H (Redondo Beach, CA), Ransom; Ray M. (Big Bear City, CA), Gallegos-Lopez; Gabriel (Lomita, CA)
GM Global Technology Operations LLC (Detroit, MI)
13/ 014,607
20120187876
January 26, 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.