走速度由液力控制实现无级调速。
道夫采用变频电机，同步齿形带传动，实现无级调速。
The doffer is driven by an inverter and a synchronous toothed belt which permits stepless variations of the speed.
可大范围内实现无级调速，可输出较大推力和较大力矩。
Can be achieved within a wide range of stepless speed regulation, can output a larger and larger torque thrust.
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