换向是所有整流子电机运行时的最薄弱环节,它往往限制了直流电机的容量、短时过负载能力,转速及磁场削弱的深度。由于牵引电动机特殊的工作条件,更会使换向情况大大恶化。而且,往往在试验台上试验时,牵引电动机的换向情况良好,但在实际运行中却出现了问题。因此,牵引电动机比起一般整流子电机的换向,更要困难得多。根据近年来实际运行 Commutation is the weakest link of all commutator motors and often limits the DC motor’s capacity, short-term overload capacity, rotational speed, and depth of field weakening. Due to traction motor special working conditions, but also make the commutation situation greatly deteriorated. Moreover, often in the test bench test, traction motor reversing good, but in actual operation there have been problems. Therefore, the traction motor commutation than the average commutator motor is even more difficult. According to the actual operation in recent years