Extended State Observer with Cogging Force Compensation for Sensorless Control Strategy of Linear Flux-Switching Permanent Magnet Machine
Meng Gaojun1, Yuan Ye2, Sun Yukun1,2, Zhu Zhiying1, Liu Haitao1
1. Jiangsu Collaborative Innovation Center for Smart Distribution Network Nanjing 210000 China; 2. School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China
Abstract：For the defects existing in cogging force caused by double salient structure of linear flux-switching permanent magnet (LFSPM) machine, a strategy about extended state observer (ESO) with control of a position-independent sensor and cogging force compensation was proposed to improve the control performance of the sensorless in LFSPM. Primarily, a back electromotive force (EMF) model was built, and a method introducing back EMF estimation value into stator current observer was studied. And then the back EMF in the current state function under the two-phase stationary reference frame, considered as disturbance of the system, performed exact estimation by using an ESO to increase the precision of observation. On this basis, the adaptive sliding-mode controller was designed, in which harmonic current was used for feed-forward compensation of the observed cogging force to eliminate the estimation errors in mover position and speed induced by time variation of cogging force and improve the performance of sliding-mode controller. Simulation results showed that the measured values of the system disturbance can quickly and accurately follow the real values, and meanwhile further suppress the position estimation error. Experimental evaluations of the proposed scheme were carried out on an A&D5435-controlled LFSPM drive platform to verify and confirm the practical efficiency of the proposed approach. The exact position tracking of LFSPM motor under different working conditions was realized.
孟高军, 袁野, 孙玉坤, 朱志莹, 刘海涛. 带定位力补偿的扩张观测器磁通切换永磁直线电机无位置传感器控制策略[J]. 电工技术学报, 2018, 33(17): 4091-4101.
Meng Gaojun, Yuan Ye, Sun Yukun, Zhu Zhiying, Liu Haitao. Extended State Observer with Cogging Force Compensation for Sensorless Control Strategy of Linear Flux-Switching Permanent Magnet Machine. Transactions of China Electrotechnical Society, 2018, 33(17): 4091-4101.
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2018, Vol. 33 
