Characteristics of motorized spindle supported by active magnetic bearings |
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Authors: | Xie Zhenyu Yu Kun Wen Liantang Wang Xiao Zhou Hongkai |
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Affiliation: | 1. Department of Design Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2. Jiangxi Zhonghang 0ptics Equipment Co. Ltd., Jingdezhen 333000, China |
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Abstract: | A motorized spindle supported by active magnetic bearings(AMBs) is generally used for ultra-high-speed machining. Iron loss of radial AMB is very great owing to high rotation speed, and it will cause severe thermal deformation. The problem is particularly serious on the occasion of large power application, such as all electric aero-engine. In this study, a prototype motorized spindle supported by five degree-of-freedom AMBs is developed. Homopolar and heteropolar AMBs are independently adopted as radial bearings. The influences of the two types of radial AMBs on the dynamic characteristics of the motorized spindle are comparatively investigated by theoretical analysis, test modal analysis and actual operation of the system. The iron loss of the two types of radial AMBs is analyzed by finite element software and verified through run-down experiments of the system. The results show that the structures of AMB have less influence on the dynamic characteristics of the motorized spindle. However, the homopolar structure can effectively reduce the iron loss of the radial AMB and it is useful for improving the overall performance of the motorized spindle. |
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Keywords: | Dynamic characteristics Finite element analysis Loss Magnetic bearings Modal analysis Spindle design |
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