Abstract

This paper analyzes the harmonics and vibration under different fault-tolerant current control when one-phase winding of dual three-phase permanent magnet synchronous motor (PMSM) is an open circuit fault. Firstly, the dual three-phase load condition subdomain model of breadloaf surface-mounted permanent magnet (PM) PMSM is established. Secondly, the working conditions of an open circuit fault of one-phase winding are set from the perspectives of no fault-tolerant (NFT) control, maximum torque (MT) control, minimum copper loss (MCL) control and single three-phase mode (STPM) control. The torque harmonics and electromagnetic force harmonics of the four working conditions are analyzed. Then, considering the multi-physical field of electromagnetic and structural coupling, the electromagnetic force in the motor air gap acts on the stator core, and the vibration under four different working conditions is calculated and analyzed. Through the comparison between the analytical method and finite element method, the accuracy of the established model is verified. The calculation method is effective and accurate, it can quickly predict the motor performance in case of one-phase open circuit fault of dual three-phase PMSM.

Highlights

  • Academic Editor: Jan AwrejcewiczPolyphase permanent magnet synchronous motors (PPMSMs) have attracted more and more attention in ship propulsion, electric vehicles, wind power generation and other applications

  • It can be seen that the descending order of the harmonic content of the motor under the four control modes is single three-phase mode (STPM), maximum torque (MT), minimum copper loss (MCL), no fault-tolerant (NFT)

  • The electromagnetic force harmonics of MT control, MCL control and STPM control are distributed in 4kpfr, 2kpfr and 6kpfr, where k is the natural number and fr is the mechanical frequency of motor rotation, that can be calculated by nr /60

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Summary

Introduction

Polyphase permanent magnet synchronous motors (PPMSMs) have attracted more and more attention in ship propulsion, electric vehicles, wind power generation and other applications. The sub domain method (SM) divides the motor into multiple structural domains and quickly calculates the air gap magnetic field results of the motor in combination with the boundary conditions. In reference [11], a fault-tolerant hybrid current control method is proposed by combining single-phase three-phase mode control with maximum torque control. Reference [12] established the mathematical model of one-phase open circuit dual three-phase PMSM according to four different neutral connection modes under fault state, and derived the MCL vector control strategy under four conditions. Under different fault-tolerant conditions, the torque harmonics, electromagnetic force harmonics and vibration of the motor are analyzed by using the FE method and analytical model. The results show the effectiveness and accuracy of the analytical method It provides a basis for studying the winding open circuit fault of dual three-phase PMSM

Subdomain Model of Dual Three-Phase Motor
Open Circuit Fault Condition Setting
No Fault Tolerant Control
Maximum Torque Control
Minimum Copper Loss Control
Single Three-Phase Mode Control
Torque Harmonic Analysis
Harmonic Analysis of Radial Electromagnetic Force
Modal Calculation of Stator Core
Electromagnetic Vibration
Conclusions
Full Text
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