Stability and damping performance analysis of induction motor

This paper presents the stability and damping performance analysis of induction motor driven by open-loop constant V/Hz control. Based on linearized mathematical model, the unstable ranges of induction motor are illustrated, which involve with the motor parameters and the frequencies of applied voltage. Then the well-known concept of damping ratio is adopted to give further analyses on damping performance, it is found that the variation of motor parameters can improve the stability but at the same time deteriorate the damping ratio at critical frequency. Time-domain simulations are used to validate these frequency-domain analytical results. The stability of induction motor with different motor parameters is also investigated.