This paper explained on DC driving system of X2012A plane miller working board, based on electric heavy repair realized use discrepancy regulating speed system as a substitue for nondiscrepancy regulating speed.

• 本文论述了X2012A龙门铣床工作台的直流驱动系统通过电气大修改造实现以无差调速取代有差调速电控系统。