Critical Slip in Maximum Electromagnetic Power of a Motor for Borehole Prospecting Mechatronic Devices

The extraordinary conditions for borehole motors such as: wide operating medium temperature change interval from –20oC up to +250oC, hydrostatic pressure changes from atmospheric up to 210 MPa, operating medium – dielectric liquid, limited power source, long geophysical, cable of up to 10,000 m non-constant load, due to the operating cycle have influence on their reliable operating, maximum power transmission, and change of characteristics. In this particular case, it is important to know the maximum electromagnetic power, which may be created by the motor. The critical slip and maximum electromagnetic power of the induction motor with a solid rotor supplied from a limited power-source and through the complex circuit, taking into account the parameters of the motor and supply circuit, as well as the operating peculiarities, have been derived. The study of computed characteristics of the borehole motor, taking into account the above-mentioned conditions, show that the motor supplied from a limited power-supply source and through the complex circuit should be investigated inseparably from the whole system.