Design of Induction Motor for PWM Frequency Converter

Abstract

Basically the induction motor is a constant speed machine. Speed of the induction motor will vary minor depending upon the load due to increase in a slip. Large variation of speed can be obtained only by varying the frequency of the supply by use of variable frequency or speed drives. A supply to the induction motor is given from a PWM converter. Frequency converter is used to generate the variable voltage and frequency required to control the speed of induction motor. Converter gives inversion of voltage coming from the link DC into an alternate signal of variable amplitude and frequency. Damage in insulation, harmonic, temperature rise, damage in bearing, etc are the problems present in the motor when operated with PWM converter. To overcome this, it is necessary to modify the design of conventional induction motor for PWM frequency converter. This project focuses on the precautions which are considered at the time of manufacturing of this type of motor.