Sensorless Control of a Permanent Magnet Synchronous Motor based on an Instantaneous Reactive Power in the Field-Weakening Region

약계자 영역에서의 순시무효전력을 이용한 PMSM의 센서리스 제어

  • 이정흠 (인하대학교 전기공학과) ;
  • 김영석 (인하대학교 전기공학과) ;
  • 최양광 (인하대학교 전기공학과)
  • Published : 2005.02.01

Abstract

This paper presents the position sensorless vector control of a cylindrical permanent magnet synchronous motor(PMSM) in the field weakening region. The position sensorless algorithm using an instantaneous reactive power of the PMSM is proposed. An instantaneous reactive power can be obtained from the vector product of rotor currents and back emf of the PMSM. Back emf includes the information of rotor speed. So the estimated speed can be yielded from the voltage equation of the PMSM. In other words, the estimated speed is compensated by using an instantaneous reactive power. To extend the speed range of the PMSM in the constant horsepower region, the field weakening control is applied. The proposed algorithm is not affected by mechanical motor parameters because the mechanical equation is not used. The effectiveness of the proposed algorithm is verified by the experimental results.

Keywords

References

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