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A Sensorless Rotor Position Estimation Scheme for IPMSM Using HF Signal Injection with Frequency and Amplitude Optimization

  • Lu, Jiadong (School of Automation, Northwestern Polytechnical University, and Shaanxi Key Laboratory of Small & Special Electrical Machine and Drive Technology) ;
  • Liu, Jinglin (School of Automation, Northwestern Polytechnical University, and Shaanxi Key Laboratory of Small & Special Electrical Machine and Drive Technology) ;
  • Hu, Yihua (Dept. of Electrical Engineering and Electronics, University of Liverpool) ;
  • Zhang, Xiaokang (School of Automation, Northwestern Polytechnical University, and Shaanxi Key Laboratory of Small & Special Electrical Machine and Drive Technology) ;
  • Ni, Kai (Dept. of Electrical Engineering and Electronics, University of Liverpool) ;
  • Si, Jikai (School of Electrical Engineering and Automation, Henan Polytechnic University)
  • Received : 2017.07.24
  • Accepted : 2018.04.24
  • Published : 2018.09.01

Abstract

High frequency signal injection (HFI) is an alternative method for estimating rotor position of interior permanent magnet synchronous motor (IPMSM). The general method of frequency and amplitude selection is based on error tolerance and experiments, and is usually set with only one group of HF parameters, which is not efficient for different working modes. This paper proposes a novel rotor position estimation scheme by HFI with optimized frequency and amplitude, based on the mathematic model of IPMSM. The requirements for standstill and low-speed operational modes are met by applying this novel scheme. Additionally, the effects of the frequency and amplitude of the injected HF signal on the position estimation results under different operating conditions are analyzed. Furthermore, an optimization method for HF parameter selection is proposed to make the estimation process more efficient under different working conditions according to error tolerance. The effectiveness of the propose scheme is verified by the experiments on an IPMSM motor prototype.

Keywords

AC motor drives;HF parameter optimization;HF signal injection;Interior permanent magnet synchronous motor;Sensorless control

Acknowledgement

Supported by : Shaanxi Science Technology Co-ordination

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