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Effects of Temperature on Control Performance of Magnetically Levitated Planar Actuators
Rou-gang Zhou,Si-jie Yan,Yun-fei Zhou,Xin Cheng,Chou Jay Tsai Chien 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
During the operation of magnetically levitated planar actuators (MLPAs), the temperature of current coils is rising and the resistancevaries in proportion, thus changing the current loop’s gain and directly affecting the system’s control performance. The coiltemperature also affects the temperature of adjacent magnetic steel, attenuating the residual flux density of magnetic steel andchanging the driving force and torque outputted from coils. In this paper, we analyzed the effects of temperature rise on the controlperformance of MLPAs. 1) A coil temperature analytical model was used to compute real-time coil temperature, and the temperatureparameters were predicted to linearly modify the servo gain coefficient of current loop controller, ensuring that the dynamicperformance of current loop is consistent during the operation of MLPAs. 2) A correction factor modifying the effect of temperatureon magnetic field intensity was added into the current decoupled model, which improved the precision of the dynamics model andsatisfied the strict requirement on the precision of MLPAs.
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