THE INFLUENCE OF DIFFERENT MATERIAL CHARACTERISTIC IN COMPOUND CAGE ROTOR OF INDUCTION MOTOR ON STARTING PERFORMANCE

Firstly,according to the electromagnetic field theory and the Variation method,the 2D mathematics model was developed during the starting of different material in compound cage rotor of induction motor,and the method to solve sinusoidal time-varying field was given.In the process of calculation,the stator terminal voltage was taken as restriction condition,and the starting current is iterated to obtain the starting current and starting torque under the rated voltage.Secondly,on the basis of these,by varying rotor slot,starting performance for different rotor structure motor was calculated when rotor materials were different.Thirdly,by comparison of different scheme,rotor slots and material were rationally chosen,and sample motor was manufactured and tested.Then,by comparing calculated results with measured results,the calculation of the starting performance for the induction motor with compound cage rotor indicated to meet the demands of project practice.Finally,comparing with the general induction motor,the different material in compound cage rotor of induction motor proved to be of the better starting performance.