Analysis of starting transients of squirrel-cage induction motor. The start-off stage

Abstract

The outcomes of a theoretical transient analysis of a stationary IM during connection to the net work are reported. Based on the obtained analytical expressions, the influence of each component of transient currents and electromagnetic torque on ripple amplitudes and transient time is revealed. The original reason for the long term and high ripple starting torque transient is clarified and possible ways of eliminating them are theoretically justified.

Mathematical modelling of starting modes of induction motors with squirrel-cage rotor

“…Most methods of calculating start-up modes, including those used in known computing environments, are based on the classic substituting circuits of the IM, which do not always meet the needs of practice. In order to increase the accuracy of calculations, in some works [4,11] the authors divide the start-up process into separate parts. However, reliable information about the course of processes during start-up can be obtained only with the help of highly developed mathematical models of the IM, which adequately take into account all major factors, in particular, changes in inductive resistances due to saturation and in active resistances due to skin effect.…”