The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Analysis of Estimated Position Error by Magnetic Saturation and Compensating Method for Sensorless Control of PMSM

자속 포화에 의한 PMSM 센서리스 위치 추정 오차 분석 및 보상 기법

  • Park, Byung-Jun (School of Energy Engineering, Kyungpook National University) ;
  • Gu, Bon-Gwan (School of Energy Engineering, Kyungpook National University)
  • Received : 2018.06.22
  • Accepted : 2018.11.20
  • Published : 2019.03.01
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Abstract

For a pump or a compressor motor, a high periodic load torque variation is induced by the mechanical works, and it causes system vibration and noise. To minimize these problems, load torque compensation method, injecting periodic torque current, could be utilized. However, with the sensorless control method, which is usually utilized in the pump and compressor for low cost, the periodic torque current degrades the accuracy of the rotor position estimation owing to the inductance variation. This paper analyzes the rotor position and speed estimation error of sensorless control method with constant motor parameters under period loading. Assuming the constant speed by the accurate load torque compensation, the speed error equation is derived in frequency domain with inductance depending on the stator current. Further, it is also shown that the rotor position error could be minimized by compensating the inductance variation. The simulation and experimental results verify that the derived speed error model and the validity of the inductance compensation method.

Keywords

Acknowledgement

이 논문은 2017년도 정부(교육부)의 재원으로 한국 연구재단의 지원을 받아 수행된 기초연구사업임(No. NRF-2017R1D1A3B03030254). 본 연구는 2016년도 중소벤처기업부의 기술개발사업 지원에 의한 연구임[S2449721].

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