我矿有WK-4A电动挖掘机4台,每年挖掘石灰石170万t。该设备的使用环境十分恶劣,特别是石灰石矿山,硬度大,爆破时又经常产生底根。所以,经常发生直流发电机损坏。从各矿山使用该电动挖掘机的情况,回转直流发电机发生问题最多。笔者从多年电动挖掘机调试与修理经验出发,谈一谈该型 I Mine has WK-4A electric excavator 4, 1.7 million tons of limestone excavation every year. The use of the equipment is very harsh environment, especially limestone mines, hardness, blasting often produce the end of the root. Therefore, DC generator damage often occurs. From the use of the mine in the case of electric excavators, rotary DC generators have the most problems. The author from many years of electric excavator debugging and repair experience, talk about the type