Method and apparatus to compensate for resistance variations in electric motors
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United States of America Patent
Stats
-
Jun 25, 2002
Grant Date -
N/A
app pub date -
Sep 6, 2000
filing date -
Sep 17, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method are described for adjusting the modeled resistance used in the control of an electric motor drive to match the actual resistance of the motor. The system comprises sensors for measuring motor current and motor speed, which data is inputted into a processing unit. The processor uses the measured rotational speed to calculate what the proper current should be based upon the torque desired. If the calculated current is not equal to the measured current, then the modeled resistance of the motor is altered to correct the current. The invention is particularly useful for permanent magnet brushless motors operating in voltage mode.
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