起重机小车运行机构永磁涡流制动特性仿真分析

Permanent magnet eddy current brake performance simulation analysis of the trolley traveling mechanism of a crane

基于电磁学理论分析了永磁涡流制动基本原理,建立了制动力关于永磁体充磁厚度和底面直径、磁极对数、极距以及空气间隙厚度等参数的数学模型;对比分析了解析计算与Ansoft Maxwell软件仿真结果,验证了数学模型的准确性和实用性;探究了磁极对数、永磁体永磁厚度和底面直径、空气间隙厚度以及极距对制动力的影响机理,得到了制动力与以上各参数之间的特征关系,并根据桥式起重机结构特点建立了小车运行机构的动力学模型。基于Matlab/Simulink软件对某型号桥式起重机小车运行机构的永磁涡流制动特性和吊重摆角进行了仿真分析,为起重机小车运行机构永磁涡流制动的设计提供了依据。

The fundamental of permanent magnet eddy braking is analyzed and the math model about the parameters of braking force,the number of the magnet pole pair,the thickness and bottom diameter of the magnet and so on is developed on the basis of electromagnetic theory. Additionally, the results of math model and Ansoft Maxwell are analyzed to verify its correctness and the practicability. The influence mechanism of the number of the magnet pole pair, the thickness and bottom diameter of the magnet and so on to the braking force is explored to gain the characteristic relation among them. The dynamic model is developed according to the characteristic of bridge crane and design the parameter of the permanent magnet eddy current brake. At the last, the simulation of the dynamics is performed to provide the basis to the design of permanent magnet eddy current brake of the crane.