Torque limit of PM motors for field-weakening region operation

Patent · Tue Feb 14 04:00:00 EST 2012

OSTI ID:1036713

Royak, Semyon ^[1]; Harbaugh, Mark M ^[2]

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1. Beachwood, OH
2. Richfield, OH

The invention includes a motor controller and technique for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by receiving a torque command, determining a physical torque limit based on a stator frequency, determining a theoretical torque limit based on a maximum available voltage and motor inductance ratio, and limiting the torque command to the smaller of the physical torque limit and the theoretical torque limit. Receiving the torque command may include normalizing the torque command to obtain a normalized torque command, determining the physical torque limit may include determining a normalized physical torque limit, determining a theoretical torque limit may include determining a normalized theoretical torque limit, and limiting the torque command may include limiting the normalized torque command to the smaller of the normalized physical torque limit and the normalized theoretical torque limit.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE
• Assignee: Rockwell Automation Technologies, Inc. (Mayfield Heights, OH)
• Patent Number(s): 8,115,437
• Application Number: US patent applicaiton 12/036,099
• OSTI ID: 1036713
• Country of Publication: United States
• Language: English

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