Hamilton Sundstrand Corporation

Precision Engine Controls Corporation

Joel Mawhinney

A DC brushless motor includes a rotary actuation shaft having multiple poles. Each of the poles has multiple commutation steps. The DC brushless motor also includes a motor controller capable of controlling rotation of the rotary actuation shaft. The motor controller stores a commutation step map.

Commutation calibration via motor mapping

A drive system for a motor has a switching network for supplying three phases of power to a motor, and a control for the switching network. The control is programmed to provide a commutation with a positive offset, ahead of a current position, when driving in opposition to a load, and to use one of a zero or negative offset when the control drives the motor complementary to the load force. A method and system are also disclosed and claimed.

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San Diego, CA, United States of America

Joel Mawhinney