变频器驱动异步电机振动频谱特征分析

为提出一种更加有效的电机振动抑制算法,对电机振动频谱特性进行讨论.介绍了异步电机调速系统振动数据采集单元以及不同运行状态下的电机振动数据采集,给出了调压器调压和变频器变频调速2种情况下不同转速的电机振动频谱图和转速谱图.通过这些谱图,分别对电机振动特征、变频器载波频率对电机振动特征的影响进行了对比分析.谱图分析表明,采用变频器驱动异步电机时,一阶转频引起的强迫振动与自由振动波形会发生畸变,且电机振动峰值增大.随着变频器载波频率的增加,电机振动幅值将显著降低.变频器引入的高阶振动谐波转矩使得电机的振动特征更加复杂.电机振动频谱特征分析为电机振动抑制算法设计与算法评价提供了基础.

Analysis of vibration spectrum characteristics for asynchronous motor driven by inverter

In order to propose a kind of more effective algorithm for motor vibration suppression,the spectrum characteristic was discussed.The vibration data sampling unit of asynchronous motor drive system and the motor vibration data sampling under different running conditions were introduced.Vibration spectrums and speed spectrums of different speeds were given under two control manners by using inverter and voltage regulator.Motor vibration characteristic and influence of inverter carrier frequency on the vibration characteristic were compared and analyzed by means of those spectrums.Comparison and analysis show that the one-order rotation frequency causes the forced vibration and the free vibration wave occurs the distortion,and the vibration peak value increases,when asynchronous motor is driven by the inverter.The motor vibration magnitude decreased obviously when the inverter carrier frequency increases.High-order harmonic torque is introduced into the inverter to make more complex vibration characteristic of asynchronous motor.The spectrum characteristics analysis of motor vibration provides the basis of design and appraisal for motor vibration suppression algorithm.