During drilling process, screw drill motor sometimes doesn't work properly or even seriously damaged because of sand jamming.

在钻井施工作业中，螺杆钻具常因砂卡导致螺杆马达工作失效，导致螺杆钻具报废，严重影响了正常钻井作业。

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The hydraulic seam drill is equipped with the synchronous gear motor as the driving part, which can effectively solve the corrosive problem of the emulsion to the motor body.

乳化液煤层液压钻使用同步马达作为其驱动元件，可有效解决乳化液对马达机体的腐蚀问题。

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After pearl rotates for 180 o, pull (1) hand towards motor, then begin to drill hole until the pearl is holed through.

珍珠翻转180度以后，向电机方向扳动1手柄，再次实施打孔，通孔即完成。

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To complete the drilling without mishap, the rover's operators on Earth had to devise new procedures to solve a series of computer software problems that affected the craft's motor's control systems, said JPL drill-systems engineer Scott McCloskey.

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