Study the effects of no nominal conditions on the performance of high efficiency induction motor

Paper deals with a mathematical model to study the processes arising when starting a pump unit electric drive. The electric motor under investigation is a newly-developed induction motor with squirrel-cage rotor, designed to operate in continuous duty, with high efficiency energy class. The influence of the voltage deflection on the performance of specific induction motor as part of the electric drive has been evaluated. The mathematical model developed allows to set deflection of the supply voltage in the variation of the factor of inertia. The results on the influence of the supply voltage on impact torques and currents and electrical energy losses have been obtained. The results obtained are in addition to experimental studies of the same motor and they could be of great practical importance when considering to start and if possible control the speed of induction motors.