超磁致伸缩致动器功率驱动装置的谐波分析及抑制

摘要

For the power drive unit of giant magnetostrictive actuator based on sinusoidal pulse width modulation, its output voltage contains a large number of high-order harmonic which will bring vibration , noise and damage to the actuator. The harmonic of PWM inverter output voltage was analyzed by Fourier series. On this basis, the harmonic spectrum distribution and the influence factors of total harmonic distortion factor were obtained. An LCCR low-pass filter was proposed to suppress the harmonic based on analyzing the characteristics of the LCCR filter with inductive load. Meanwhile, larger modulation depth was selected to reduce the total harmonic distortion factor. Finally, the simulation and experimental results showed that the LCCR filter had a good performance to suppressing harmonic.%针对SPWM调制的超磁致伸缩致动器功率驱动单元输出的电压中含有大量的高次谐波会对致动器带来振动、噪声及对致动器造成破坏等问题,利用傅里叶级数分析了PWM逆变器输出电压中的谐波,指出了谐波的频谱分布规律和影响总谐波系数的因素.分析了LCCR滤波器的滤波特性,提出了采用在PWM逆变器后加入LCCR低通滤波器来抑制高次谐波以及选用大的调制深度来减小总谐波系数的方案.通过仿真及试验验证了该方案的有效性.