Loss analysis of rotor magnet with PWM controller switching frequency variation
Transportation Electrification Asia-Pacific（2014）
Abstract
When high-power Permanent Magnet Synchronous Motor (PMSM) is operating with large stator current and high rotating speed there will be large amount of harmonics component in stator winding and deduce significant eddy current loss in rotor magnet. A detailed analytical method was proposed which calculated the eddy current loss in rotor magnet based on FFT analysis of stator current. A Finite Element Method (FEM) was founded to evaluate the relation of eddy current loss in rotor magnet and stator winding harmonics which were caused by different switching frequency. The flux densities in air gap, eddy current distribution and eddy current loss in rotor magnet were investigated. At last a testing method was applied to measuring the eddy current loss in rotor magnet which is based on testing descending of back Electromotive Force (EMF), temperature of rotor magnet. The three results have a good agreement with each other.
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Key words
eddy current losses,fast fourier transforms,finite element analysis,harmonic analysis,permanent magnet motors,rotors,stators,synchronous motors,emf,fem,fft analysis,pmsm,pwm controller,air gap,back electromotive force,eddy current distribution,eddy current loss,finite element method,flux densities,harmonics component,permanent magnet synchronous motor,rotor magnet loss analysis,stator current,stator winding harmonics,switching frequency variation,switching frequency,eddy current loss in rotor magnet,harmonic analysis of stator current,eddy currents,mathematical model
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