Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Analysis of Estimation Errors in Rotor Position for a Sensorless Control System Using a PMSM

  • Park, Yong-Soon (Dept. of Electrical Eng. and Computer Science, Seoul National University) ;
  • Sul, Seung-Ki (Dept. of Electrical Eng. and Computer Science, Seoul National University) ;
  • Ji, Jun-Keun (Dept. of Electrical Eng., Soonchunhyang University) ;
  • Park, Young-Jae (Digital Media and Communication R&D Center, Samsung Electronics Co., Ltd.)
  • Received : 2012.03.05
  • Published : 2012.09.20
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Abstract

In a sensorless control system with a Permanent Magnet Synchronous Motor (PMSM), the angular position of the rotor flux can be estimated by a voltage equation. However, the estimated angle may be inaccurate due to various causes. In this paper, it was comprehensively analyzed how various causes affect the angle error. As a result of the analysis, an error equation intuitively describing these relationships was derived. The parameter errors of a PMSM and the non-ideal properties of the driving system were identified as error-causing factors. To demonstrate the validity of the error equation, PMSMs were tested at various operating points. The variations in angle errors could be well explained with the error equation.

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References

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