水轮机磁悬浮导轴承动力学特性
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摘要
水轮机磁悬浮导轴承是一种无油轴承,其工程可靠性一直没有很好的解决。作者应用理论分析方法及基于其Halbach阵列的动力学特性ANSYS仿真,对水轮机径向混合磁悬浮导轴承动力特性的非线性模型及其线性化方程进行研究,设计了一种水轮机径向混合磁悬浮导轴承。研究表明在单一自由度上水轮机径向混合磁悬浮导轴承具备自稳定的特性,其负刚度可以通过轴承永磁特性调节;单元磁环厚度越大,Halbach阵列的水轮机磁悬浮永磁导轴承径向磁力越大,一定程度内表现为近似线性,之后过渡到非线性趋势,最后磁力趋于某一定值;计算结果与仿真结果偏差小于0.69%。该研究结论为水轮机径向磁悬浮导轴承装置在工程应用中提供一定指导。
The hydro-turbine magnetic suspension guide bearing is a kind of oil-less bearing. Its reliability in engineering has not been solved well. So the theoretical analysis method and an ANSYS simulation is utilized based on its Halbach Array to study the dynamic character's nonlinear model and linearity equation of hydro-turbine radial hybrid magnetic suspension guide bearings. On this basis,the author designed a type pf hydro-turbine radial hybrid magnetic suspension guide bearing. The research shows that it has the self-stabilizing characters in terms of a single degree of freedom and its negative rigidity can be adjusted through the bearing's permanent-magnetic character.With enlargement of magnetic loop's thickness in each unit,the radial magnetic force of the hydro-turbine magnetic suspension permanentmagnetic guide bearing with Halbach Array will be enlarged. To a certain degree,it appears to be approximately linear and transits the nonlinear trend later. When the magnetic force reaches a certain definite value,the deviation between the calculation result and the simulation result will be less than 0.69%. This research conclusion can be used for engineering applications of the hydro-turbine radial hybrid magnetic suspension guide bearing.
The hydro-turbine magnetic suspension guide bearing is a kind of oil-less bearing. Its reliability in engineering has not been solved well. So the theoretical analysis method and an ANSYS simulation is utilized based on its Halbach Array to study the dynamic character's nonlinear model and linearity equation of hydro-turbine radial hybrid magnetic suspension guide bearings. On this basis,the author designed a type pf hydro-turbine radial hybrid magnetic suspension guide bearing. The research shows that it has the self-stabilizing characters in terms of a single degree of freedom and its negative rigidity can be adjusted through the bearing's permanent-magnetic character.With enlargement of magnetic loop's thickness in each unit,the radial magnetic force of the hydro-turbine magnetic suspension permanentmagnetic guide bearing with Halbach Array will be enlarged. To a certain degree,it appears to be approximately linear and transits the nonlinear trend later. When the magnetic force reaches a certain definite value,the deviation between the calculation result and the simulation result will be less than 0.69%. This research conclusion can be used for engineering applications of the hydro-turbine radial hybrid magnetic suspension guide bearing.
引文
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[15] Gao H,Xu L,Zhu Y. Unbalance vibratory displacemencompensation for active magnetic bearings[J]. Chinese Journal of Mechanical Engineering,2013,26(1):95-103.
[16] Dun Yueqin,Wang Xiuhe,Kong Yu. Analysis of hybrid magnetic bearing with a permanent magnet in the rotor by FEM[J]. IEEE Transactions on Magnetics,2006,42(4):1 363-1 366.
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[19]王洪昌,蒋书运,梁玉飞.基于分子电流法轴向永磁轴承轴向刚度的分析[J].机械工程学报,2009,45(5):102-107.
[2]马宏忠.混合磁悬浮水轮发电机组转子承重系统设计与建模[J].河海大学(自然科学版),2013,51(4):5-8.
[3]田拥胜,孙岩桦,虞烈.高速永磁电机电磁轴承转子系统的动力学及实验研究[J].中国电机工程学报,2012,32(9):116-123.
[4]楼晓春,吴国庆.主动磁轴承系统的自适应滑模控制[J].电工技术学报,2012,27(1):142-147.
[5]魏彤,房建成.磁悬浮控制力矩陀螺磁轴承的变工作点线性化自适应控制方法[J].机械工程学报,2007,43(6):110-115.
[6] Nagi F H,Inayat-Hussain J I,Ahmed S K. Fuzzy bang-bang relay control of a single-axis active magnetic bearing system[J]. Simulation Modelling Practice and Theory,2009,17(4):1 734-1 747.
[7] Silva I D,Horikawa O D.Controlled attraction type magnetic bearing,electric machines and drives[C]∥. International Conference IEMD’99,Japan,1999:481-483.
[8] Ma Shilei,Pei Shiyuan,Wang Lin. A novel active online electromagnetic balancing method-principle and structure analysis[J]. Journal of Vibration and Acoustics,ASME,2012,134(3):1-8.
[9] Dun Yueqin,Wang Xiuhe,Kong Yu. Analysis of hybrid magnetic bearing with a permanent magnet in the rotor by FEM[J]. IEEE Transactions on Magnetics,2006,42(4):1 363-1 366.
[10]苏义鑫,王提峰.磁力轴承技术研究进展[J].仪器仪表用户,2007,14(5):2-4.
[11] Xiao Longxue,Wu Guoqing,Zhang Xudong. Modal analysis of maglev linear feed unit[J]. Applied Mechanics,2013,19(3):213-219.
[12] Koichi O,Tomohiro O,Toshiyuki M. DOF non-contact magnetic suspension system:a Feasibility study[J]. International Journal of Applied Electromagnetics and Mechanics,2014,45(3):627-632.
[13] Subhra Paul,Jonathan Z.Bird. Analytic3-D eddy current model of a finite width conductive plate including edge effects[J]. International Journal of Applied Electromagnetics and Mechanics,2014,45(3):535-542.
[14] Chen S Y,Lin F J.Decentralized PID neural network control for five degree-of-freedom active magnetic bearing[J].Engineering Applications of Artificial Intelligence,2013,26(3):962-973.
[15] Gao H,Xu L,Zhu Y. Unbalance vibratory displacemencompensation for active magnetic bearings[J]. Chinese Journal of Mechanical Engineering,2013,26(1):95-103.
[16] Dun Yueqin,Wang Xiuhe,Kong Yu. Analysis of hybrid magnetic bearing with a permanent magnet in the rotor by FEM[J]. IEEE Transactions on Magnetics,2006,42(4):1 363-1 366.
[17] Allag H,Yonnet J-P.3D analytical calculation of forces between linear halbach-type permanent magnet arrays[C]∥ELECTROMOTION 2009,8th International Symposium on,2009:1-6.
[18] Yonnet J P. Permanent magnet bearings and couplings[J]. IEEE Transactions on Magnetics,1981,17(1):1 169-1 173.
[19]王洪昌,蒋书运,梁玉飞.基于分子电流法轴向永磁轴承轴向刚度的分析[J].机械工程学报,2009,45(5):102-107.