氦透平膨胀机电涡流制动装置的瞬态模拟
|
摘要
电涡流制动技术具有转矩与激磁电流线性关系良好、结构简单、运行稳定、响应速度快、易于实现自动控制等优点,将其应用于氦透平膨胀机会给低温系统的运行带来诸多好处。本文基于Maxwell对氦透平膨胀机的电涡流制动装置进行瞬态模拟,阐述了电涡流制动装置的运行机理,获得了相应的磁场分布云图及转矩、涡流耗散功率的时变特性曲线。分析结果表明:电涡流主要集中于涡流环上,并表现出了较明显的趋肤效应;转子所受转矩和涡流耗散功率均呈现了一定的时变震荡特性,且转速越大,涡流耗散功率也越大。
Eddy current brake technology has the advantages of good linear relationship between torque and exciting current,simple structure,stable operation,fast response speed,and easy realization of automatic control. Applied to the helium turbine expanders it can bring many benefits to the operation of the cryogenic system. Based on Maxwell,this paper numerically simulated the eddy current brake device of the turbine expander,expounded the function mechanism of the eddy current brake device,and obtained the corresponding magnetic field distribution cloud diagram and the time-varying curves of the torque and dissipation power. The analysis results indicate that the eddy current mainly concentrates on the eddy current rings with obvious skin effect. The torque of rotor and the dissipation power all show certain time-varying oscillation characteristics,and the greater dissipated power is accompanied with a higher rotation speed.
Eddy current brake technology has the advantages of good linear relationship between torque and exciting current,simple structure,stable operation,fast response speed,and easy realization of automatic control. Applied to the helium turbine expanders it can bring many benefits to the operation of the cryogenic system. Based on Maxwell,this paper numerically simulated the eddy current brake device of the turbine expander,expounded the function mechanism of the eddy current brake device,and obtained the corresponding magnetic field distribution cloud diagram and the time-varying curves of the torque and dissipation power. The analysis results indicate that the eddy current mainly concentrates on the eddy current rings with obvious skin effect. The torque of rotor and the dissipation power all show certain time-varying oscillation characteristics,and the greater dissipated power is accompanied with a higher rotation speed.
引文
[1]常旭宁,孙俊芳,乔佳,等.氦透平膨胀机在我国的发展[J].低温与超导,2014,42(2):30-34.
[2]寇炳国.电磁涡流制动器的发展及应用[J].石油机械,1985,13(12):61-65.
[3]He R,Liu C,Li N.Fuzzy control of the integrated system of electromagnetic brake and friction brake of car[J].Journal of Mechanical Engineering.2010,46(24):83-87.
[4]Lubin T,Mezani S,Rezzoug A.Two-dimensional analytical calculation of magnetic field and electromagnetic torque for surface inset permanent magnet motors[J].IEEE Trans.Magn.2012,48:2080-2091.
[5]Mohammadi S,Mirsalim M.Double-sided permanent magnet radial flux eddy current couplers:three-dimensional analytical modeling,static and transient study,and sensitivity analysis[J].IET Electr.Power Appl.2013,7:665-679.
[6]王学敏,朱平,付豹.油气混合氦透平膨胀机在EAST低温系统中应用现状研究[J].润滑与密封,2010,35(7):95-98.
[7]胡剑,付豹,庄明,等.氦透平膨胀机制动风机机理分析与控制方案[J].低温工程,2014(06):6-11+37.
[2]寇炳国.电磁涡流制动器的发展及应用[J].石油机械,1985,13(12):61-65.
[3]He R,Liu C,Li N.Fuzzy control of the integrated system of electromagnetic brake and friction brake of car[J].Journal of Mechanical Engineering.2010,46(24):83-87.
[4]Lubin T,Mezani S,Rezzoug A.Two-dimensional analytical calculation of magnetic field and electromagnetic torque for surface inset permanent magnet motors[J].IEEE Trans.Magn.2012,48:2080-2091.
[5]Mohammadi S,Mirsalim M.Double-sided permanent magnet radial flux eddy current couplers:three-dimensional analytical modeling,static and transient study,and sensitivity analysis[J].IET Electr.Power Appl.2013,7:665-679.
[6]王学敏,朱平,付豹.油气混合氦透平膨胀机在EAST低温系统中应用现状研究[J].润滑与密封,2010,35(7):95-98.
[7]胡剑,付豹,庄明,等.氦透平膨胀机制动风机机理分析与控制方案[J].低温工程,2014(06):6-11+37.