基于组合继电反馈的永磁同步直线电机推力波动辨识方法

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Abstract Force ripples,caused by slot force and end force,are the significant factor which restricts the dynamic performance of linear motors.As a consequence,a new identification method based on the relay feedback was proposed to model and compensate for the force ripples in linear motors.Taking the direct feed platform as a researching object,the dynamic of the system was modeled and a signal source which included an ideal relay component and a hysteresis relay component along with dead zone was designed firstly.Hence,dual input description functions were obtained by implementing the method of describe function to linearize the designed relay components.Furthermore,the analytical expressions of the identified parameters in the nonlinear system were solved according to the requirement for oscillation.Finally,simulation study has been carried out for validating the feasibility and accuracy of the method while relevant experiments were conducted on the platform.Experiment results have shown that the thrust current fluctuation was reduced 46.3% while the RMSE of the tracking error can be reduced from 34.1 μm to 19.3 μm.

Key words： Linear motors oscillation parameter identification relay feedback force ripple

Received: 30 March 2016 Published: 12 May 2017

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TM351

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	Zhang Xiang
	Ye Peiqing
	Zhang Hui

Cite this article:

Zhang Xiang,Ye Peiqing,Zhang Hui. An Identification Method of Force Ripple in Permanent Magnet Synchronous Linear Motors Based on the Combined Relay Apparatus[J]. Transactions of China Electrotechnical Society, 2017, 32(9): 1-9.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I9/1

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