基于母线电流的无刷直流电机换相位置优化策略

通过分析无刷直流（BLDC）电机换相位置与母线电流的关系，建立了母线电流与换相位置偏差的数学关系，在此基础上提出了一种无位置传感器无刷直流电机换相位置优化策略。该策略以控制绕组电流与反电动势（BEMF）同相位为目标，以换相位置补偿角为被控制量，以母线电流随换相角度的变化率作为偏差量，通过比例积分（PI）调节器调节电机换相位置;并且可以同时校正位置信号检测误差和绕组电感引起的相位偏差。通过实验验证了该策略可以准确、快速地找到最佳换相位置，有效提高电机运行效率。

BLDC motor commutation position optimization strategy based on bus current

This paper analyzes the relation between commutation position of brushless direct current (BLDC) motors and bus current, builds up their mathematical relation, and proposes a sensorless BLDC motors commutation position optimization strategy. This strategy regulates the commutation position by a proportional integral (PI) adjuster, aiming at regulating the current and the back electromotive force (BEMF) in-phase. The controlled variable of the PI adjuster is the commutation position compensating angle and the deviation value is the ratio of current change over angle. This optimization strategy can revise the detected position signal error and the phase deviation caused by the winding inductance at the same time. The experimental results verify that this optimization strategy can get the best commutation position accurately and fast, and improve the operating efficiency effectively.