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《Journal of Vibration and Shock》 2011-09
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Improved passive electromagnetic damper and its application

LIU Shu-lian1,ZHENG Shui-ying2 ( 1.School of Mechanic & Automotive engineering Zhejiang University of Science and Technology,Hangzhou 310023,China; 2.Institute of Chemical Machinery,Zhejiang University,Hangzhou 310027,China)  
To simply and reliably improve the stability of rotor-bearing system and eliminate the oil whip online,the method of using an improved passive electromagnetic damper to increase the damping effect was proposed.Its configuration is similar to that of electromagnetic bearing,but no sensors and no closed loop control are needed.When the rotor is rotating,the electromagnetic damping is formed due to the eddy currents induced inside the surface layer of rotor to mitigate vibration.Increasing direct current can enhance damping,but the stiffness of system will be decreased and the resistance torque and heat of damper will take place.In order to improve the characteristics of damper and avoid the decreasing of stiffness,a new method of adding extra circuit was presented,without changing the configuration and the static current.By choosing appropriate parameters of extra circuit devices,the damping effect of the improved damper is more evident than that of the original.The experiment results show that with the improved damper,better effect of reducing vibration and eliminating oil whip of rotor-bearing system can be achieved.
【Fund】: 国家高技术研究发展计划(863计划)(2009AA04Z413);; “流体机械与多相流的基础研究及应用”高校创新团队(T200918);; 浙江省自然科学基金资助项目(Y1110109)
【CateGory Index】: O328
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