Abstract
Due to the complex end effect, it is difficult for the linear induction motor to design and analyze with the "road" calculation and two-dimensional field calculation. Considering the end effect, skin effect and secondary leakage reactance of the eddy current of the secondary induction plate, a linear induction motor electromagnetic design and calculation program was programmed via VB language. A two-dimensional finite element analysis method was proposed to approximate the lateral end effect on linear induction motor performance by multiplying the two lateral end effect coefficients into secondary induction plate resistivity and air-gap relative permeability. The accuracy for both calculation of end effect coefficients by "road" calculated program and considering lateral end effect in two-dimensional finite element analysis was validated by using the experiment and three-dimensional full model finite element, respectively. This work proposes the calculation method of the lateral end effect, which is faster and more accurate for the electromagnetic design as well as the finite element simulation of linear induction motor.
Highlights
Cr(s) 影响时的气隙磁密结果,考虑 Cx(s) 影响时的 气隙磁密幅值有所减小。 VB“ 路” 算程序计算结果
[ 1] XU Wei, ZHU Jianguo, TAN Longcheng, et al Optimal design of a linear induction motor applied in transportation[ C] ∥IEEE International Conference on Industrial Technology, 2009
Survey on the development of linear induction motor based on railway transportation[ J]
Summary
K′x( s) ,Cr( s) ,Cx( s) 计算 式。 其 中, 横向端部效应 对次级电阻的修正系数计算式 其中, r1 为初级绕组电阻,x1 为初级绕组漏电 抗,xm0 为磁化电抗,r′2 为归算到初级的次级电阻,X2 为次级漏电抗。 上述参数的计算方法与旋转电机相 同。 K′r( s) ,K′x( s) 分别为纵向动态端部效应对次级 电阻和磁化电抗的修正系数;Cr(s),Cx(s) 分别为横 向端部效应对次级电阻和磁化电抗的修正系数;Kf 为集肤效应对次级电阻的修正系数。 U1 ( r1 + Req) 2 + ( x1 + Xeq) 2 ( 13) R1 + Req ( r1 + Req) 2 + ( x1 + Xeq) 2 ( 15) 言编写直线感应电机“ 路” 算设计程序。 并设计了 1 台时速 80 km / h 的直线感应电机。 样机设计参数 见表 1。
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