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.
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