access icon free Survey on high-frequency models of PWM electric drives for shaft voltage and bearing current analysis

In this study, a review on high-frequency modelling in electric machines is conducted. Pulse-width modulation (PWM) creates common-mode-voltage (CMV) and common-mode-current (CMC) in electric drives with high-frequency impacts such as shaft voltage and bearing current which in turn cause bearing failures. To predict and reduce these failures in an electric machine, transitional modelling of high-frequency pulses is necessary. At the first step, several methods for high-frequency modelling in an electric drive are categorised. At the second step, several types of bearing currents discussed and CMV and CMC in electric drives are introduced. At the third step, CMV, CMC and bearing currents are simulated for six types of PWM methods and experimental verification is reported. Finally, root-mean-square value of a distorted parasitic current is introduced for comparing the electromagnetic effects of PWM methods.

Inspec keywords: machine bearings; electric machines; PWM invertors; failure analysis; electric drives; machine theory

Other keywords: bearing current analysis; electromagnetic effects; electric drives; CMV; bearing failures; high-frequency pulses; common-mode-current; transitional modelling; PWM electric drives; high-frequency models; common-mode-voltage; CMC; root-mean-square value; distorted parasitic current; pulse-width modulation; electric machines; PWM inverters; shaft voltage

Subjects: DC-AC power convertors (invertors); Drives; a.c. machines; Reliability; d.c. machines

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