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介绍了全数字直流调速技术的工作原理及目前牙轮钻机电控的转术水平．结合钻机的工作特点，着重介绍了全数字直流调速技术在牙轮钻机上的应用。
The working principle of all-digital DC speed control technology and the current level of electric control of roller cone drilling rig are introduced. Combined with the working characteristics of drilling rig, the application of all-digital DC speed regulation technology on roller cone drilling rig is introduced emphatically.