Özet:

Electromechanical and thermal transients at start-up of squirrel-cage induction motors in reduced voltage conditions are the object of research. One of the most troubled places in these processes is sufficient difficulty diagnosing of resource consumption of induction motors with heavy start-up in reduced voltage conditions and timely facilitation of such regimes with a view to resource saving. To determine the diagnostic parameters of starting modes for induction motors at reduce of supply voltage it is necessary to identify the dependence of start-up duration depending on the parameters of the «motor – working machine» system and their impact on the thermal insulation wear in motor during period after start-up. Therefore, the main way to increase the operational reliability of induction motors is to develop technical device for diagnostics of additional thermal insulation wear in induction motor. We use such methods as: analysis method and mathematical modeling method. It is grounded that pulse of squared starting current can take as diagnostic parameter of additional thermal insulation wear of induction motor. Investigation of thermal insulation wear shows that the thermal transient at the start-up is adiabatic. Main thermal insulation wear is during period after start-up. The dependence of additional thermal insulation wear on the pulse of squared electric current of induction motor allows to select pulse set point of squared starting current of proposed device, which will facilitate the starting mode of the motor. A structural diagram of the device for diagnostics of additional thermal insulation wear in squirrel-cage induction motor during period after start-up is proposed. Author Biographies Олександр Юрійович Вовк, Tavria State Agrotechnological University, Khmelnitsky av., 18, Melitopol, Ukraine, 72312 PhD, Associate Professor Department of Electrical Engineering and Electro Mechanics

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