三相电动机以三相电源驱动感应电动机，其效率很高，启动力矩也比较大。
Three-phase motor relies on three-phase supply. It has a high efficiency and can get a high starting torque.
镗床主传动系统是用来实现镗床主运动的，它将主电动机的原动力变成可供主轴上刀具切削加工的切削力矩和切削速度。
The system of boring main driving is used to achieve the main movement boring machine, main Motor will become the driving force on the tool spindle machining cutting torque and the cutting speed.
镗床主传动系统是用来实现镗床主运动的，它将主电动机的原动力变成可供主轴上刀具切削加工的切削力矩和切削速度。
The system of boring main driving is used to achieve the main movement boring machine, main Motor will become the driving force on the tool spindle machining cutting torque and the cutting speed.
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