Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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High frequency pulse injected double stage filtering method for linear permanent magnet motor position error compensation considering parameter asymmetry

  • Yan, Jianhu (School of Automation, Nanjing University of Science and Technology) ;
  • Song, Tongyue (School of Automation, Nanjing University of Science and Technology) ;
  • Chi, Song (School of Automation, Nanjing University of Science and Technology) ;
  • Ying, Zhanfeng (School of Energy and Power Engineering, Nanjing University of Science and Technology)
  • Received : 2021.02.07
  • Accepted : 2021.05.31
  • Published : 2021.09.20
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Abstract

Due to machining errors and the effect of the longitudinal end of a stator, linear permanent magnet motors (LPMMs) produce asymmetric three-phase winding resistance and inductance. After a Park transformation of the asymmetric three-phase stator inductance, the dq axis inductance is not constant, and the dq axis is coupled. This leads to errors in estimating the motor position by the traditional pulse injection method. In this paper, the position estimation error caused by parameter asymmetry is analyzed to discuss the influence of LPMM asymmetric three-phase winding parameters on high frequency pulse injection sensorless method error. Moreover, a double stage filtering method is used to realize error compensation. On this basis, a simulation model was built by MATLAB/Simulink and experiments were carried out on a LPMM prototype under no-load conditions. The simulation and experimental results verify that the double stage filtering method can improve the position estimated accuracy and dynamic performance under sensorless control.

Keywords

Acknowledgement

This work was supported in part by the National Natural Science Foundation of China under Grant 51607091.

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