COMPENSATION SYSTEM AND METHOD FOR ZERO-CROSSING VOLTAGE OF BACK ELECTROMOTIVE FORCE OF BRUSHLESS DIRECT CURRENT MOTOR

WIPO Patent Application WO/2024/078595

A1

Disclosed in the present invention are a compensation system and method for a zero-crossing voltage of back electromotive force of a brushless direct current motor. First, a bus current threshold is preset in a voltage compensation module to divide a voltage compensation reference; second, the voltage compensation module compares a bus current value with the bus current threshold to determine whether the bus current value exceeds the bus current threshold; then the voltage compensation module outputs a corresponding voltage compensation signal according to a comparison result of the bus current value and the bus current threshold; and finally, a controller compensates for a zero-crossing voltage of back electromotive force of a brushless direct current motor according to the voltage compensation signal. That is, the determination reference of the zero-crossing voltage of the back electromotive force is improved to compensate for the step-down offset of the zero-crossing voltage of the back electromotive force caused by overlarge bus current, thereby improving the commutation precision of the brushless direct current motor.

LU CHUNLEI (CN)
LU RUIFENG (CN)
ZHU JIE (CN)

PCT/CN2023/124354

April 18, 2024

October 12, 2023

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JIANGSU DONGCHENG TOOLS TECH CO LTD (CN)

H02P6/182

CN115664275A	2023-01-31
CN114362608A	2022-04-15
CN107482962A	2017-12-15
CN109167539A	2019-01-08
CN208158473U	2018-11-27
US20040263113A1	2004-12-30

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