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Dynamic Strategy for Effective Current Reduction in Brushless DC Synchronous Motors Fault Tolerant Operation

Author

Listed:
  • Rafael de Farias Campos

    (Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil)

  • Cesar da Silva Liberato

    (Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil)

  • José de Oliveira

    (Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil)

  • Tiago Jackson May Dezuo

    (Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil)

  • Ademir Nied

    (Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil)

Abstract

This work presents a flexible strategy for RMS current reduction of healthy phases for brushless DC synchronous motors (BLDC) operating in phase opening failure, avoiding motor degradation without reducing its performance and allowing safe shutdown when a phase failure is detected. After the diagnosis of an open-phase failure, a corrective action divided into three steps is proposed. First, the traditional Six-Step operating mode with 120° electric degrees is changed to a new operating mode that uses the two healthy phases at 180° electric degrees to reduce torque loss due to phase failure. Second, a trapezoidal shape (with adjustable angles according to the RMS current level) is imposed as a current reference for the controller to reduce the current level and, consequently, improve the efficiency of the motor. Third, the passband of the speed control loop is reduced to minimize the influence of speed oscillations in controller failure. The experimental results presented show that the mode of operation with the proposed dynamic current reduction strategy allows an approximate reduction of up to 27% in the effective current and up to 41% in the motor temperature variation, compared to the usual failure mode of operation of the BLDC motor without the proposed strategy. The dynamics of change in the trapezium angle allowed a weighting between the current level and the oscillation of the speed, preventing the motor in phase failure from having a high-speed variation.

Suggested Citation

  • Rafael de Farias Campos & Cesar da Silva Liberato & José de Oliveira & Tiago Jackson May Dezuo & Ademir Nied, 2022. "Dynamic Strategy for Effective Current Reduction in Brushless DC Synchronous Motors Fault Tolerant Operation," Energies, MDPI, vol. 15(24), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9323-:d:998162
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    References listed on IDEAS

    as
    1. Pierpaolo Dini & Sergio Saponara, 2019. "Cogging Torque Reduction in Brushless Motors by a Nonlinear Control Technique," Energies, MDPI, vol. 12(11), pages 1-20, June.
    2. Przemyslaw Pietrzak & Marcin Wolkiewicz, 2021. "Comparison of Selected Methods for the Stator Winding Condition Monitoring of a PMSM Using the Stator Phase Currents," Energies, MDPI, vol. 14(6), pages 1-23, March.
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