用轴向磁拉力延长立式电机推力轴承寿命的研究

摘要

为解决立式电机轴向负荷长期超载导致轴承严重磨损导致寿命缩短的问题,提出了一种利用异步电机转子被磁化后产生的轴向电磁拉力来抵消轴向载荷的方法,从而达到保护电机轴承、延长电机使用寿命的目的.以200 MW火电机组中凝聚水泵的立式电机为例,分析计算了其在轴向电磁力辅助承担部分轴向负载,推力轴承的寿命变化情况；并进行了实验研究.理论分析和实验结果表明,该方法可以有效地降低轴承磨损,延长其使用寿命.%To solve the heavy wear and poor life of thrust bearing in vertical motor because of its axial load long-term overload, the paper proposes a method that the axial load is offset by axial electromagnetic tension generated after the asynchronous motor rotor magnetized. Taking the vertical motor of condensed water pump in a 200 MW thermal power unit as example, the life of thrust bearing is calculated in the case of a part of axial loads on the axial magnetic force auxiliary. Experiment result shows that the method can lower the wear of thrust bearing and improve its life.