Sensorless LADRC System of PMLSM based on EKF-LESO cascade observation

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (21) : 53-61.

DONG Jiachen, GAO Qinhe, CHEN Zhixiang, NIU Hailong

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Abstract

To overcome a permanent-magnet linear synchronous motor (PMLSM)’s shortcomings of being sensitive to disturbance and easy to chatter due to noise, and get rid of position sensor’s constraint to motor servo system, a PMLSM sensor-less vector control system with the linear active disturbance rejection controller (LADRC) taken as its core, and the extended Kalman filter (EKF) algorithm and the linear extended state observer (LESO) as its cascade observation was constructed.Firstly, the error source of the control system was analyzed theoretically, it was shown that the observation accuracy of LESO is not affected in cases of input measured signals existing slow time-varying bias and observing "middle order" states except the first order state and the (n+1) one.Then, the cascade observation mode of EKF+LESO was proposed, and a sensor-less position loop LADRC system was built.Finally, simulation was done to verify fault tolerance of LESO, following ability and noise suppression ability of the control system.The test results further showed that the designed system can be used to correctly realize speed observation of the linear motor; the system operates smoothly and has a better practicability.

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PMLSM / LESO / EKF / cascade observation / LADRC

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DONG Jiachen, GAO Qinhe, CHEN Zhixiang, NIU Hailong. Sensorless LADRC System of PMLSM based on EKF-LESO cascade observation[J]. Journal of Vibration and Shock, 2019, 38(21): 53-61

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