Beihang University

Sha He

Haitao Li

Gang Liu

Shiqiang Zheng

Tong Wen

Hao Jin

A sensorless commutation error compensation system for a brushless motor, comprises: a brushless motor () and a commutation logic module circuit (). The commutation logic module circuit () is connected to three virtual Hall signal output ends of the brushless motor (), and used for receiving three virtual Hall signals output by the brushless motor (), obtaining three error compensation angle signals on the basis of the three virtual Hall signals, respectively superimposing the three error compensation angle signals and the three virtual Hall signals to form superposition results, and controlling the brushless motor () to adjust commutation timing on the basis of the superposition results, so as to achieve commutation error compensation. The system controls commutation errors on the basis of currents and counter-electromotive forces of three phases, instead of controlling the commutation errors on the basis of the current and the counter-electromotive force of one of the three phases, so that a torque ripple of a brushless direct-current motor can be reduced and a working efficiency of the motor can be improved.

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Beijing, China

Sha He