电磁液冷缓速器制动力矩影响参数

Influence Factor of Braking Torque in Electromagnetic Liquid-cooled Retarder

针对传统电涡流缓速器的风冷散热、热衰退问题严重的缺点,提出一种双凸极构造的电磁缓速器模型.在该缓速器的定子内设有液体通道,通过液冷措施及时排出缓速器工作时产生的热量,使其保持较低的温度;介绍了该缓速器的结构,在进行理论分析后,应用电磁场有限元分析专用工具,对缓速器的磁场和涡流场进行分析,详细讨论了电导率、励磁电流以及励磁电流饱和程度对制动力矩的影响.结果表明:随着电导率的增加,制动力矩逐渐趋于饱和;当励磁电流饱和时,随着励磁电流的增大,制动力矩不会明显地增加;当励磁电流的饱和程度不断增加时,制动力矩变化缓慢.

Aiming at air cooling and thermal recession problem of the traditional eddy current retarder, a type of salient pole electromagnetic liquid-cooled retarder （ELR） was proposed. The liquid channels were equipped in the retarder＇ s stator. The heat generated during the operation was discharged through a liquid-cooled system, which can make the retarder maintain a lower temperature. Firstly this paper introduced the structure of retarder. After conducting theoretical analysis, the magnetic and the eddy current field of the retarder were analyzed by the finite element analysis software. The effects of the conductivity, the excitation current and excitation current saturation degree on the brake torque were discussed in detail. Results show that the braking torque becomes increasingly saturated with the increase of the electrical conductivity; when the excitation current is saturated, the torque increases slightly with the increase of the excitation current; when the degree of saturation excitation current increases, the torque changes slowly.