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Restarting Method for EEMF Based Sensorless Permanent Magnet Synchronous Motor Drive Systems

EEMF 기반 센서리스 영구자석 동기전동기 구동 시스템의 구동 재개 방법

  • Lee, Young-Jae (Dept. of Electrical & Computer Engineering, Ajou Univ.) ;
  • Bak, Yeongsu (Dept. of Electrical & Computer Engineering, Ajou Univ.) ;
  • Lee, Kyo-Beum (Dept. of Electrical & Computer Engineering, Ajou Univ.)
  • Received : 2018.11.13
  • Accepted : 2018.12.07
  • Published : 2019.04.20

Abstract

This paper proposes a restarting method for extended electromotive force (EEMF)-based sensorless permanent magnet synchronous motor (PMSM) drive systems. The sensorless PMSM drive systems generally estimate the rotor speed and angle based on EEMF. However, if the inverter is stopped while the PMSM is rotating, the initial rotor speed and angle are required for restart. Therefore, the proposed restarting method estimates the initial rotor speed and angle using the short-circuit current generated by applying zero voltage vector from the inverter. The validity of the proposed method is verified by simulation and experimental results.

Keywords

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Fig. 1. Space vector diagram of PMSM.

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Fig. 2. Block diagram of the least order observer for estimating eγest.

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Fig. 3. Block diagram of estimating rotor speed and angle.

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Fig. 4. Control block diagram of sensorless PMSM drive system.

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Fig. 5. Short-circuit current vectors generated by (a) first and (b) second zero vector.

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Fig. 6. Simulation results of EEMF based sensorless PMSM drive system.

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Fig. 7. Simulation results of proposed restarting method for EEMF based sensorless PMSM drive system.

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Fig. 8. Experimental set.

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Fig. 9. Experimental results of EEMF based sensorless PMSM drive system.

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Fig. 10. Experimental results of proposed restarting method for EEMF based sensorless PMSM drive system.

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Fig. 11. Experimental results of initial rotor speed and angle estimated by using the proposed restarting method.

TABLE I PMSM PARAMETERS

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