Electronic Science and Technology ›› 2021, Vol. 34 ›› Issue (4): 24-33.doi: 10.16180/j.cnki.issn1007-7820.2021.04.005

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Research Development of Initial Rotor Position Detection of Permanent Magnet Synchronous Motors

LI Yifei,JIANG Quan   

  1. School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China
  • Received:2020-01-09 Online:2021-04-15 Published:2021-04-16
  • Supported by:
    National Important Research and Development Program(2018YFB0104603)


Permanent magnet synchronous motors are widely used in the field of motor drives because of their high efficiency and small moment of inertia. In the field of high-performance drive control, there is a high demand of reliable and fast startup of the motor, so the speed and position information of the rotor is essential. The accuracy of the initial position estimation of the permanent magnet synchronous motor will directly determine whether the motor can be started and the performance of the motor control. Position sensors are bulky, costly, and sensitive to the environment, which limits the application range of permanent magnet synchronous motors. Sensorless technology has gradually become a research hotspot. In this study, the detection methods of initial rotor position of permanent magnet synchronous motor are discussed. The study respectively introduces the rotor position detection method based on the salient pole effect of the magnetic circuit structure of the motor or the non-linear saturation characteristic of the stator core and the specific implementation scheme. Finally, the initial position detection methods of permanent magnet synchronous motor are summarized and predicted.

Key words: permanent magnet synchronous motor, high performance control, sensorless, fast startup, initial rotor position detection, magnetic circuit structure salient pole effect, non-linear saturation characteristic of the stator core

CLC Number: 

  • TP273