永磁偏置径向磁轴承的原理分析与参数设计

为克服现有永磁偏置径向磁轴承的缺陷,研究了一种磁悬浮高速电动机用永磁偏置径向磁轴承,利用等效磁路法分析其结构及工作原理,得出了径向悬浮力的数学模型,并对数学模型进行了线性化处理,得出了其径向力-位移系数和力-电流系数。给出了磁极面积、控制绕组、定转子结构等主要参数的设计方法,并制作了实验样机,对样机进行了三维有限元仿真分析和动静态悬浮实验。理论研究和实验结果表明,该型磁轴承转子磁滞损耗小,结构紧凑,控制简单,悬浮性能良好,给出的参数设计方法合理。

Principle Analysis and Parameter Design of Permanent Magnet Bias Radial Magnetic Bearing

To overcome the defects of the present permanent magnet biased radial magnetic bearing(PRMB),a PRMB is studied to develope for the high speed magnetic suspending motor application.The configuration and fundamental principle of PRMB are analyzed.The equivalent magnetic circuit is established to deduce the mathematical model of the radial magnetic suspension force.The displacement stiffness and current stiffness are derived by linearizating the mathematical model.The parameter design of PRMB is presented including the area of magnetic pole,control windings,stator and rotor configuration etc.The parameters of the proposed prototype are given.The 3-D magnetic field simulation is performed,and the static experiment and dynamic experiment are accomplished.The theory analysis and the experiment results show that the rotor hysteresis loss of the presented PRMB is reduced,and it also has smaller volume compared to the existing structure and the control is easier.The levitation performance is well and the parameter design method is rational.