永磁无刷直流电动机位置传感器精度对脉动转矩抑制效果的影响研究

Research on The Position Sensor Precision Effect for Pulsating Torque Suppression of Permanent Magnet Brush-less DC Motor

采用峰谷互补方法对永磁无刷直流电动机的脉动转矩进行抑制时,2台电机脉动转矩波形的对称性和正弦性与抑制效果密切相关,而位置传感器的精度直接影响电机脉动转矩的波形特性。基于此,首先通过实验测定了2种位置传感器在电机运行时其输出信号的相位差、占空比和响应速度,并进行了分析。然后搭建实验平台测定了电机在2种位置传感器工况下脉动转矩的对称性和正弦性。最后,对比了2种位置传感器运行时电机脉动转矩的抑制效果,结果表明在光栅位置传感器工况运行时电机脉动转矩的抑制效果约提升30%。

When the peak-to-valley complementary method is used to suppress the ripple torque of the permanent magnet brushless DC motor,the symmetry and sinusoidal of the two motor ripple torque waveforms are closely related to the suppression effect,and the accuracy of the position sensor directly affects the motor ripple torque.Waveform characteristics.Based on this,the phase difference,duty cycle and response speed of the output signals of the two position sensors during motor operation were measured and analyzed.Then the experimental platform was built to determine the symmetry and sinusoidality of the pulsating torque of the motor under two position sensor conditions.Finally,the suppression effect of the motor ripple torque during the operation of the two position sensors is compared.The results show that the suppression effect of the motor ripple torque is about 30%when the grating position sensor is running.