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.