Reduction control of induction motor vibration with pulsating load by repetitive control using an acceleration sensor

Abstract

AbstractRecently, the V/F control drive system of the induction motor has been applied widely to the drive of compressors, pumps, etc., because it is very simple and basically requires no speed sensors. However, if the V/F controlled induction motor drives a pulsating load such as the compressors, the rotational speed of the motors is fluctuated considerably and the motor frame vibrates due to the pulsating load torque. When frequency of the torque pulsation is especially close to the resonant frequency of the mechanical system, large vibration and acoustic noise are produced.In this paper the authors propose a method to reduce the vibration of the V/F controlled induction motor with a fluctuated load by repetitive control using an acceleration sensor. The acceleration sensor is easy to install on the motor or load frame. The repetitive control is considered effective for reduction of the vibration, as the load torque varies periodically. Effectiveness of the proposed method is confirmed by approximate analysis and experiments.