无铁心直线感应悬浮电机非均匀气隙工况的三维磁场与力特性分析

3D Analytical Model to Analysis the Magnetic Field and Characteristic of Coreless Linear Induction Maglev Motor for Uneven Air Gap Conditions

该文以适用于低真空管道高速磁浮列车的无铁心直线感应悬浮电机为研究对象,针对其运行过程中可能存在的非均匀气隙工况,在直角坐标下建立该电机的磁场和电磁特性的三维解析模型。首先,介绍该直线感应悬浮电机的拓扑结构及其工作原理;其次,采用积分法求解得到直线感应悬浮电机初级的三维空间磁场分布函数,并对该磁场分布函数进行傅里叶级数转换,使电机初级三维磁场函数具有形式上连续统一的解析表达式;再次,基于二阶矢量磁位(second order vectorpotential,SOVP),提出无铁心直线感应悬浮电机可考虑任意气隙(均匀、不均匀)工况的三维解析模型,推导出悬浮力、牵引力、涡流损耗等电磁参数的解析表达式,并通过有限元法验证解析计算的准确性;最后,通过小型样机试验,来验证理论计算的合理性。

The coreless linear induction maglev motor(CLIMM)used in ultra-high speed maglev,which may lead to an uneven air-gap between its primary and secondary,is proposed and investigated.The analytical model is set up in 3D cartesian coordinates to calculate the magnetic field and electromagnetic performance.Firstly,the basic structure and principle of the proposed motor is introduced.Then,the 3D magnetic field distribution function and its Fourier series of the primary based on integral approach is proposed.Based on second order vector potential(SOVP),a 3D analytic model of the motor was proposed in the paper,thus,it get the expression of the lift force,thrust force and powerlosses.The calculations of magnetic field in the air gap,forces and powerlosses are conducted by finite element method and analytical method,respectively,the outcome proves that the analytical model in this paper is correct and practical.Finally,a small scale prototype is manufactured,and experiments are carried out to verify the predicted results.