Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Effect of demagnetization faults on line start AF-PMSM performance

  • Eker, Mustafa (Mechatronics Engineering Department, Tokat Gaziosmanpasa University) ;
  • Ozsoy, Mustafa (Electric Electronical Engineering Department, Tokat Gaziosmanpasa University)
  • Received : 2021.11.04
  • Accepted : 2022.03.06
  • Published : 2022.06.20
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Abstract

This study is concerned with irreversible demagnetization faults in axial flux permanent magnet synchronous motors (AF-PMSM). Line start capability was provided to the AF-PMSM by making changes in its traditional rotor architecture. With this architecture, the motor operates as an asynchronous motor in the transient state and as a synchronous motor in the steady state. In this study, the impacts of an irreversible demagnetization fault on motor performance, which occurs in motors due to various reasons, is investigated. The four poles of the used AF-PMSM have 5.5 kW of shaft power. Each pole is comprised of five identical magnets. Different rates (20%, 40%, and 60%) of demagnetization failure were created in a single pole. The data acquired from the faulty motors were compared to data from a healthy motor. The results indicate that irreversible demagnetization faults have an adverse impact on motor performance. It was observed that the experimentally created demagnetization faults increase the current drawn by the motor. In addition, they cause a decrease in both the power factor and efficiency. However, the faults did not have an adverse impact on the starting capability of the motor. The unique aspect of the present study is that it is the first time the impacts of demagnetization faults on the performance of line start AF-PMSMs have been examined.

Keywords

Acknowledgement

This study was supported by the Tokat Gaziosmanpasa University Scientific Research Projects Unit, Project number 2019/48.

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