永磁式缓速器制动特性分析

Analysis of Braking Characteristics of Permanent Magnet Type Retarder

介绍了永磁式缓速器的结构和工作原理,将Nd-Fe-B永磁体简化为通电线圈。运用电磁学原理和麦克斯韦方程,分析了永磁式缓速器定子、气隙、转子鼓中的磁场分布和边界条件。使用能量法,计算出转子鼓中的感生电流(涡流)的损耗,建立了永磁式缓速器制动力矩的简化计算模型。试验结果表明计算值和试验值能够较好地吻合。根据制动力矩计算模型,分析了永磁式缓速器制动力矩的理论计算和试验的特性曲线,得出了影响制动性能的几个因素,为以后的生产和设计提出了改进意见,并有一定的指导作用。

The basic configuration and operating principle of permanent magnet type retarder are described in this paper. Permanent magnet （Nd-Fe-B） was simplified to current-carrying coil.Using the derivation from electromagnetics and Maxwell equations , this paper analyses magnetic field and boundary condition in stator, rotor drum and air gap. Using energy method, wastage of eddy in rotor is calculated , and simplified model of braking torque is obtained. The experimental results show that the calculated values were in good agreement with the experimental results. In terms of model of braking torque, curves of braking characteristics of test and calculating are comprehensively analysed, and several factors influencing on braking characteristics were obtained. Several improved proposals are put forward. This paper reports that this model will influence on design and manufiacture of permanent magnet type retarder.