Object of research: induction submersible electric motor as a part of electric drive centrifugal pump. Subject of the research: non-nominal operation modes of induction submersible electric motors, including modes of wedging. Purpose of research: creation of research methodology of operation of induction submersible electric motors at non-nominal modes of operation, including variation of frequency of feeding voltage and its magnitude. Methods of research: theory of electromechanical transformation of energy, digital modeling, statistical data processing, methods designing of experiments. Main results of research: the relevance of submersible electric motors research in non-nominal conditions is substantiated; the technique of asynchronous submersible electric motors operation research in non-nominal operating modes is built; the proposed technique is tested on the example of the ESP unit wedging mode.