Abstract
The paper considers a method for starting an induction electric motor with a phase rotor. The proposed system consists of an induction electric motor in the rotor circuit where a two-link frequency converter based on an autonomous voltage inverter is included. A frequency-dependent parametric device (induction resistance) is connected to the output of the inverter. The induction resistance is a device consisting of an inductor and a magnetic circuit. Its principle of operation is based on the phenomenon of electromagnetic energy absorption by the magnetic core of the rheostat and its conversion into thermal energy. The higher is the frequency of the current flowing through the resistance windings, the higher is the power absorbed by the magnetic circuit and the electrical parameters of the induction resistance. By influencing the electrical parameters of the induction resistance magnetic circuit, it is possible to influence the characteristics of the electric motor. In the course of the work, the induction resistance was compared with a rheostat and a reactor connected in series with each other. Also, the optimal ratio between the active and inductive parts was selected for the node of the rheostat and the reactor. Based on the results of computer simulation, conclusions are made about the possibility of replacing the induction resistance with a rheostat with a series-connected reactor. The most optimal will be the use of induction resistance. When the rheostat is switched on with the reactor, the losses in the active part will be almost identical. However, with a minimum active resistance, it will be necessary to take into account the values of the output current of the inverter and select keys that allow short-term operation with overloads or take keys of higher power. With a large active component, the operating speed decreases due to the fact that changing the frequency does not affect its value, unlike the induction resistance.
Keywords
Induction electric motor, phase rotor, frequency converter, induction resistance, reactor, simulation modeling.
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