The driving circuits adopt constant current chopping for the purpose of improving rotating torque and increasing working efficiency of the stepper motor.
驱动电路采用恒流斩波方式，提高了步进电机的运转扭矩和工作效率。
Currently, the DTH RIGS use generally a percussion rotary penetration sys-tem to generate the rotating torque that produces a shearing action for breaking rock.
目前，潜孔钻机普遍采用冲击回转凿入系统，用以产生回转力矩，对岩石产生剪切作用而成颗粒分离。
Currently, the DTH RIGS use generally a percussion rotary penetration sys-tem to generate the rotating torque that produces a shearing action for breaking rock.
目前，潜孔钻机普遍采用冲击回转凿入系统，用以产生回转力矩，对岩石产生剪切作用而成颗粒分离。
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