Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Rotor position estimation over entire speed range of interior permanent magnet synchronous motors

  • Lee, Hyung-Woo (Department of Electrical and Computer Engineering, Ajou University) ;
  • Cho, Dae-Hyun (Department of Electrical and Computer Engineering, Ajou University) ;
  • Lee, Kyo-Beum (Department of Electrical and Computer Engineering, Ajou University)
  • Received : 2020.11.05
  • Accepted : 2021.01.04
  • Published : 2021.04.20
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Abstract

This paper presents a method for transitioning between sensorless rotor position estimation methods for an interior permanent magnet synchronous motor (IPMSM). Through the proposed method, rotor position estimation over the entire speed range of the IPMSM is possible. Considering that each sensorless method governs a different speed range for estimating rotor position and speed with good accuracy, a strategy for transitioning between two methods is indispensable. In this study, a sensorless method based on extended back electromotive force (EMF) is used for high-speed operation. In addition, during low-speed operation, rotor position is estimated using the slope of measured current through the application of a zero-voltage vector. A weight function is applied to the position and speed information obtained from the two sensorless methods. The combined information is then used throughout the speed range of the IPMSM. To achieve smooth transitions, the weight function is altered based on the rotor speed in the transition region. The effectiveness of the proposed transition method was demonstrated via simulations and experiments.

Keywords

Acknowledgement

This research was supported by Korea Electric Power Corporation (Grant No. R19XO01-20) and a grant (20RTRP-B146008-03) from the Railroad Technology Research Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government.

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