Energy parameters of a submersible asynchronous electric motor at variations of rotor pack electromagnetic parameters

A mathematical model to study changes in the energy parameters of a submersible electrical motor (SEM) through rotor pack parameters variations has been completed. Resistance variations influence coefficients of rotor pack short-circuited winding PEDN (SEMI)32-117 to power losses in the pack as well as efficiency and SEM air gap torque were determined in the Mathematica software. The worst-case energy mode of the pack characterized with an increase in power losses by 61.6 % under conditions of SEM nominal load, the pack overheating and SEM premature failure was determined. The necessity of controlling rotor packs active resistance during the SEM assembly stage and expediency of completing the rotor in packs with active resistance positive and negative variations for compensation of variations having different signs, stabilization and reduction in the SEM energy parameters spread are substantiated.