电机支承轴承是牵引电机中的一个关键部件。轴承的运转情况直接影响到牵引电机的运行可靠性，为此必须选择合适的轴承，设计良好的支承定位结构及正确的润滑密封系统，本文系统地介绍了电机轴承的选型依据．不同传动方式应选择的轴承类型，以及影响轴承额定转达的因素。 Motor support bearings are a key component in traction motors. Bearing operation directly affects the reliability of traction motor operation, for which must choose the right bearing, well-designed bearing structure and the correct lubrication of the sealing system, the paper systematically introduced the motor bearing selection basis. Different types of transmission should choose the type of bearing, as well as affect the bearing rated transfer factor.