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《Journal of Liaoning Technical University(Natural Science)》 2009-05
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Critical speed calculation and mode analysis of rotor for high speed motor

WANG Tianyu1,2,WANG Fengxiang2,FANG Cheng2,KONG Xiaoguang2(1.College of Mechanical and Engineering,Shenyang Institute of Engineering,Shenyang 110136,China;2.School of Electrical Engineering,Shenyang University of Technology,Shenyang 110178,China)  
A 3D finite element analysis(FEA) is used to establish the critical speed and vibration mode of the magnetic bearing-rotor system of high-speed motor.Also,the bearing stiffness of 3D-FEA model was determined using vibration experiment according to the suspension characteristics of the magnetic bearing system.The critical speeds calculated using FEA are consistent with actual results of the rotor system.The study shows that the bearing stiffness has significant impact on the critical speed of rotor.The critical speed can be adjusted by changing bearing stiffness and material properties.The shaft extension should be maintained at a safe range in order to avoid critical speed at rotor bending modes.
【Fund】: 国家自然科学基金重点项目资助(50437010);; 辽宁省教育厅科技基金项目资助(2008483);; 2008年沈阳工程学院科技项目
【CateGory Index】: TM355
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