煤矿传送用外转子感应电机的设计

Design of external rotor induction motor for coal mine transmission

外转子感应电机设计时,受额定输出转矩的约束,需给定初始转子内径值,进行相关电磁设计计算。再通过不断循环迭代,来确定转子内径,得到电动机各部分尺寸的设计方案。本文采用有限元法对所给外转子感应电机设计方案进行二维瞬态磁场计算,对比了电机的磁场分布和性能特性,分析了电机气隙谐波含量,验证了基于转子内径循环迭代法进行电机设计的准确性。本方法与传统感应电机设计方法相比,可减少循环迭代数,降低对经验公式的依赖,计算简单,易于程序化。

A direct drive type of external rotor induction motor is designed for coal mine transmission. The outer diameter of the rotor is fixed with a belt to drive the transmission system directly. In the design of the outer rotor induction motor, with the limit of the rated output torque and the given initial value of the rotor diameter to conduct electromagnetic design calculation, the rotor diameter is determined by continuous iterations. The sizes of various parts of the motor are finally obtained and the design scheme is presented. The finite element method is taken in a given external rotor induction motor design to conduct a 2D transient field calculation. The magnetic field distribution and the performance characteristics of the motor are compared. The motor air gap harmonic content is analyzed and the accuracy of motor design based on iterations of the rotor inner diameter method is verified. Comparing with the traditional induction motor design method, the proposed method is less dependent on the experience formula, and the calculation is more simple and easier to be programmed.