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Rotor Position and Speed Estimation of PMSM Based on BEMF Method

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DOI: 10.23977/amce.2019.032


Guanglin Dong, Dafang Wang, and Mingyu Wang

Corresponding Author

Guanglin Dong


Permanent magnet synchronous motor (PMSM) sensorless control is a research hotspot at present. The position and speed estimation of PMSM rotor based on back electromotive force (BEMF) is widely used in industrial control due to its simple principle and high estimation accuracy at high speed. In this paper, the principle of estimating rotor position and speed based on BEMF is deduced by PMSM mathematical model in two-phase stationary coordinate system, and the closed-loop control system of PMSM is designed based on the estimated rotor position and speed. It is also pointed out that there are some problems in the actual implementation of BEMF method, such as integral zero drift, fluctuation of speed estimation, variation of PMSM parameters and limited application scope, and the solutions are given in the end.


PMSM, Rotor Position, Speed Estimation

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