Reduction Control of Vibration of Induction Motor with Pulsating Load by Repetitive Control utilizing Acceleration Sensor.

Abstract

Recently, the V/F control drive system of the induction motor is widely applied to the drive of compressors, pumps, and so on, because it is very simple and basically requires no speed sensors. However, in the case that the V/F controlled induction motor drives a pulsating load such as the compressors, the rotational speed of the motors is considerably fluctuated and the motor frame is vibrated 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, authors propose a method to reduce the vibration of the V/F controlled induction motor with a fluctuated load by repetitive control utilizing an acceleration sensor. It is easy to install the acceleration sensor 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.