Rotor position estimation in a bldc motor at low speed using g-functions and extended state observers

2021 ◽  
Author(s):  
Isai Jimenez Hernandez ◽  
Carlos Garcia Rodriguez ◽  
Jesus Linares Flores
Keyword(s):  
Position Estimation ◽  
Bldc Motor ◽  
Extended State ◽  
Low Speed ◽  
Rotor Position ◽  
State Observers ◽  
Rotor Position Estimation

scholarly journals Full-Speed Range Encoderless Control for Salient-Pole PMSM with a Novel Full-Order SMO

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2423 ◽  
Author(s):  
Yuanlin Wang ◽  
Xiaocan Wang ◽  
Wei Xie ◽  
Manfeng Dou
Keyword(s):  
Sliding Mode ◽  
Permanent Magnet Synchronous Motor ◽  
Position Estimation ◽  
Low Speed ◽  
Rotor Position ◽  
Stator Current ◽  
Salient Pole ◽  
Start Up ◽  
Full Speed ◽  
Rotor Position Estimation

For salient-pole permanent magnet synchronous motor (PMSM), the amplitude of extended back electromotive force (EEMF) is determined by rotor speed, stator current and its derivative value. Theoretically, even at extremely low speed, the back EEMF can be detected if the current in q-axis is changing. However, it is difficult to detect the EEMF precisely due to the current at low speed. In this paper, novel full-order multi-input and multi-output discrete-time sliding mode observer (SMO) is built to detect the rotor position. With the proposed rotor position estimation technique, the motor can start up from standstill and reverse between positive and negative directions without a position sensor. The proposed method was evaluated by experiment.

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