异步电动机转子电阻斩波调速系统的特性分析与仿真研究

转子电阻斩波调速是异步电动机一种简便而有效的调速方法。本文对异步电动机转子电阻斩波调速系统的静态和动态特性进行了详细的分析，进一步确定了转子外接电阻的计算方法和系统的动态数学模型，并对该系统应用MATLAB／SIMuLINK进行了仿真研究。仿真结果表明，本文的分析是简单而有效的。

异步电动机动态过程MATLAB仿真

针对传统的对异步电机动态过程仿真的缺陷,提出了用MATLAB对异步电机动态行为进行仿真;本文应用参照系理论,并采用标幺化处理方法来建立电机的数学模型,用MATLAB语言进行仿真,做出仿真结果。分析结果可知,仿真结果与传统方法具有良好的一致性。

电动助力转向器模型和控制策略的建立

在分析电动助力转向器的结构和工作原理之后,建立了转向器转向盘与转向轴上端、小齿轮与转向轴下端、助力电动机数学模型。同时,研究了直线型、折线型和曲线型助力特性,设计了直线型助力转向器的助力特性曲线,满足了电动助力的轻便型的要求,并给出了确定直线型助力特性的参数计算方法,为电动助力控制策略提供了常用的技术方案。

MATLAB在电机仿真中的应用

推导出直流电动机和同步旋转坐标系(M,T坐标系)下异步电动机的数学模型。利用Matlab/Simulink对其进行了仿真和封装。获得了仿真结果并将封装后的电机模型加入到库元件中。验证了电机模型的正确性。

Study on cogging force of permanent magnet linear synchronous motor

Presented the methods to obtain the cogging force of permanent magnet linear synchronous motors(PMLSMs), analyzed the characteristics of the cogging force, and provided a basis for reducing the effect of the cogging force. 2-dimensional finite element method(2D FEM) was used to solve the whole motor when its mover was at dif- ferent position, so that the relation was derived between the cogging force and the mover position. The analysis results show that the cogging force between the two ends of the primary iron-core and the secondary permanent magnets (PMs) is sinusoidal function of the mover position under certain conditions only. Two proposed methods, namely direct and indirect methods, are applied to calculate the cogging force between the primary iron-core teeth and the secondary PMs. The agreement of the two methods is validated.