直流电动机失磁故障分析

Failure Analysis of the Excitation-loss in DC Motors

介绍直流电动机失磁特性、失磁原因及影响。他励直流电动机一旦失磁即会出现"飞车"现象。直流电机调速系统采用电流双闭环调速,配备足够电感量的平波电抗器,实际上是由电流源供电,这使电动机特性发生了改变,特别是它的失磁特性。

The characteristics, reason and influence of excitation-loss failure in dc motors were introduced. Once the excitation-loss occurred in the separately excited dc motor, ＂skycar＂ phenomenon would take place. At present, the existing dc speed control system without exception adopted the current double-closed-loop speed regulation system and inductance reactor with enough impedance was equipped, ie. It was supplied by the current source that made the motor performance changed, especially, the excitationloss characteristic.