盘式实心异步磁力耦合器的调速关系分析
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摘要
气隙厚度对磁力耦合器的运行至关重要,通过改变气隙厚度实现耦合器的调速功能具有重要意义。为了研究盘式实心异步磁力耦合器的气隙厚度与调速性能之间的关系,结合等效磁路法与磁路的基尔霍夫定律建立了轴向充磁的耦合器模型。通过对模型进行解析计算得出耦合器的磁路参数,再结合三维修正系数与转矩公式得到耦合器的转矩表达式。此外,在恒转矩负载调速下,结合转矩表达式推导出气隙厚度与转差率的关系,得到调速关系式,从而研究得到盘式实心异步磁力耦合器的调速关系。利用Matlab对转矩表达式和调速关系式进行离散化求解,并用有限元仿真及实验进行对比分析,验证了调速关系在理论计算上的正确性,并为耦合器实现精确调速提供了理论依据。
The air-gap thickness is crucial to the operation of magnetic couplers,and it is of great significance for realizing speed adjustment of couplers through changing air-gap thickness. In order to investigate the relationship between air-gap thickness and adjustable-speed performance of axial-flux solid asynchronous magnetic couplers,a model for axial-flux magnetic couplers is established by combining equivalent magnetic circuit approach and Kirchhoff? s law of magnetic circuit. The magnetic circuit parameters of couplers are solved by utilizing the method of analytical calculation on the above model,then,the torque expression is obtained by integrating three-dimensional correction coefficient and torque formula. Moreover,by synthesizing the torque expression under constant torque load condition,the relationship between air-gap thickness and slip is derived,which is beneficial for acquiring the adjustable-speed relationship of axial-flux solid asynchronous magnetic couplers. The Matlab is used to solve the discretization of torque expression and adjustable-speed relationship,besides,the finite element simulations and experiments are also employed in the contrast and analyses,the accuracy of theoretical calculation is verified and the theoretical foundation for realizing precise speed adjustment of couplers is provided.
The air-gap thickness is crucial to the operation of magnetic couplers,and it is of great significance for realizing speed adjustment of couplers through changing air-gap thickness. In order to investigate the relationship between air-gap thickness and adjustable-speed performance of axial-flux solid asynchronous magnetic couplers,a model for axial-flux magnetic couplers is established by combining equivalent magnetic circuit approach and Kirchhoff? s law of magnetic circuit. The magnetic circuit parameters of couplers are solved by utilizing the method of analytical calculation on the above model,then,the torque expression is obtained by integrating three-dimensional correction coefficient and torque formula. Moreover,by synthesizing the torque expression under constant torque load condition,the relationship between air-gap thickness and slip is derived,which is beneficial for acquiring the adjustable-speed relationship of axial-flux solid asynchronous magnetic couplers. The Matlab is used to solve the discretization of torque expression and adjustable-speed relationship,besides,the finite element simulations and experiments are also employed in the contrast and analyses,the accuracy of theoretical calculation is verified and the theoretical foundation for realizing precise speed adjustment of couplers is provided.
引文
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[2]由蕤,柴建云,孙旭东,等.电磁耦合调速风力发电机组模拟实验研究[J].中国电机工程学报,2013,33(3):92-98.
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[4]杨超君,孔令营,张涛,等.调磁式异步磁力联轴器三维气隙磁场研究[J].机械工程学报,2016(8):8-15.
[5]MENG Z,ZHU Z,SUN Y.3-D analysis for the torque of permanent magnet coupler[J].IEEE Transactions on Magnetics,2015,51(4):1-8.
[6]高庆忠,佟金锴,代康.基于等效深度法的永磁涡流联轴器的涡电流分析与传递转矩计算[J].沈阳工程学院学报(自然科学版),2014,10(3):240-244.
[7]葛研军,石运卓,贾峰,等.永磁式异步磁力耦合器漏磁系数计算[J].机械设计与制造,2013(7):67-70.
[8]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].Electric Power Applications,IET,2013,7(9):665-679.
[9]李发海,朱东起.电机学[M].北京:科学出版社,2000:57-58.
[10]汤蕴缪,梁艳萍.电机电磁场的分析与计算[M].北京:机械工程出版社,2010:46-50.
[11]王秀和.永磁电机[M].北京:中国电力出版社,2007:24-28.
[12]MOHAMMADI S,MIRSALIM M,VAEZ-ZADEH S,et al.Analytical modeling and analysis of axial-flux interior permanent-magnet couplers[J].IEEE Transactions on Industrial Electronics,2014,61(11):5940-5947.
[13]RUSSELL R L,NORSWORTHY K H.Eddy currents and wall losses in screened-rotor induction motors[J].Proceedings of the IEEPart A:Power Engineering,1958,105(20):163-175.
[14]牛景丽,陈东海.基于Mag Net的磁力耦合调速器磁路机构的参数优化[J].现代制造技术与装备,2016(1):91-92.