Method and apparatus for reducing torque ripple in an electric m

Details Method and apparatus for reducing torque ripple in an electric m Method and apparatus for reducing torque ripple in an electric m

1997-04-09

1999-12-07

Masih, Karen

Electricity: motive power systems

Constant motor current, load and/or torque control

318696, H02P 700

Patent

active

059989521

ABSTRACT:
Current control values are established for an electric motor including providing a table of motor current control values as a function of motor operating angle, providing a torque request signal indicative of the desired amount of torque to be supplied by the motor, and providing a torque command signal having a value functionally related to the torque request signal and a feed-forward torque signal. The motor operating angle is monitored and the motor is energized using current control values from the table in response to the torque command signal. The amount of torque ripple experienced by the motor is measured when the motor is energized. The measured torque ripple is filtered using a time domain filter and a time domain filtered torque ripple signal is provided. The time domain filtered torque ripple signal is then averaged and the averaged time domain filtered torque ripple signal is then filtered using a spatial domain filter, the spatially filtered averaged time domain filtered torque ripple signal is the used as the feed-forward torque signal. The current control values output to the motor is stored as a function of motor operating angle for the provided torque request value when the torque ripple value is less than a predetermined value.

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