Second, the electric submersible pump connected to the pipe thread pretightening force enough (or not pre-torque).
第二，电潜泵各管螺纹联接的预紧力不够（或预紧扭矩不够）。
By applying different pre-pressure, the speed, torque and temperature of the ultrasonic motor in low and high vacuum have been tested and compared with the normal condition.
施加不同的预压力在低、高真空环境下对超声电机的转速、转矩及温升进行测量并与常态下相比较。
The results show that stalling torque increases and no load speed decreases with the increase of the pre-load and degree of vacuum.
结果表明，随着预紧力和真空度的增加，马达的堵转力矩增加而空载转速下降；
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