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Universal adaptive torque control for PM motors for field-weakening region operation

United States Patent

March 29, 2011
View the Complete Patent at the US Patent & Trademark Office
The invention includes a motor controller and method for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by, among other things, receiving a torque command, determining a normalized torque command by normalizing the torque command to a characteristic current of the motor, determining a normalized maximum available voltage, determining an inductance ratio of the motor, and determining a direct-axis current based upon the normalized torque command, the normalized maximum available voltage, and the inductance ratio of the motor.
Royak; Semyon (Beachwood, OH), Harbaugh; Mark M. (Richfield, OH), Breitzmann; Robert J. (South Russel, OH), Nondahl; Thomas A. (Wauwatosa, WI), Schmidt; Peter B. (Franklin, WI), Liu; Jingbo (Milwaukee, WI)
Rockwell Automation Technologies, Inc. (Mayfield Heights, OH)
12/ 036,024
February 22, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT This invention was made with Government support under contract number NREL-ZCL-3-32060-03; W(A)-03-011, CH-1137 awarded by Department of Energy. The Government has certain rights in the invention.