正弦BLDC电动机力矩性能分析

Torque analysis for sine wave brushless DC motor

利用Ｐａｒｋ 变换，根据ｄ－ ｑ 坐标系下正弦ＢＬＤＣ电动机的力矩公式，分析了正弦ＢＬＤＣ 电动机的力矩波动，导出了定子三相电流存在直流偏置、幅值误差和相位误差导致的力矩波动成分表达式． 通过实验样机，对有直流偏置、幅值误差和相位误差的电动机定子绕组电流对应的力矩波动情况进行了测试，分析了力矩波动成分与电动机参数的关系． 理论分析与实验结果的对比为正弦ＢＬＤＣ 电动机的力矩波动抑制提供了依据．

Park transfer is used for analysis of the torque ripple in a sine wave brushless DC motor using the torque formula for sine wave brushless DC motor in d q coordinates. The difference errors of three phase stator currents lead to torque ripptes of difference frequencies. A sample motor is used to measure the ripple torque with DC bias, amplitude error and angle error of current.