数控线切割机床中,现都采用快速走丝(9～10米/分)。走丝马达多用260瓦、1380转/分左右的小型异步电动机。由于在工作过程中钼丝换向频繁,在供电不正常有突然停电危险的地区,钼丝常常因马达惯性而拉断。由于钼丝供应困难,停电断丝成了线切割机床正常使用的一大威胁。就是在供电正常的地区,为了避免惯性拉断钼丝,也必须在关车时注意钼丝位置。有 CNC wire cutting machine tools are now used to take the fast wire (9 ~ 10 m / min). Multi-purpose wire motor with 260 watts, 1380 rev / min or so small asynchronous motors. Due to frequent commutation of molybdenum wire in the work process, molybdenum wire is often pulled off due to motor inertia in areas where the power supply is abnormally in danger of a sudden power failure. Due to the difficulty of molybdenum wire supply, power failure has become a wire cutting machine normal use of a major threat. Is in the normal power supply area, in order to avoid inertia pull off the molybdenum wire must also pay attention to molybdenum wire off the car position. Have