THE ELECTRIC DRIVE ON THE BASIS OF THE INDUCTION MACHINE WITH AN INDUCTION RESISTANCE IN THE ROTOR CIRCUIT CONNECTED THROUGH VALVE ELEMENTS
The relevance of the research is based on the intensive development of controlled AC drive, in which composition frequency-regulated induction motors with a squirrel-cage rotor (AD with SCR) and induction motors with a wound rotor (AD with WR) used for the lifting and transport mechanisms find their application field. At the stage of the modernization of the electric drive with the extension of the speed regulation range, the AD with WR is not replaced on an AD with SCR, then the winding of the rotor is short-circuited, and the stator winding is fed from a frequency converter (FC). However, the frequency converter generates a non-sinusoidal voltage on the stator, leading to the appearance of high-order harmonics, which negatively affects the service life of the AD with WR, designed for power supply from the industrial network. Therefore, the task of improving the systems of an adjustable electric drive based on an electric motor with a phase rotor in the direction of creating hybrid systems of frequency-parametric control is relevant. In work development of new electric drive systems based on an induction motors with a phase rotor having improved performance by introducing new circuit solutions and control algorithms that provide motor control via the rotor circuit. Research results: the principle of operation of the induction resistance, introduced into the rotor circuit through a frequency converter, changing its parameters depending on the frequency of the current flowing through it, is described. A method for controlling the speed of the electric motor, which consists in a smooth change of the additional inductive-active resistance introduced into the rotor circuit connected to the rotor through a frequency converter, is proposed. The technique reduce to the rotor winding resistance and induction resistance to the DC link is applied. The efficiency test of the proposed electric drive system in the software package MatLab Simulink through the method of mathematical modelling, is performed. On the basis of computer simulation mechanical and power characteristics of the described electric drive system were obtained. On the grounds of the data obtained as a result of modelling the properties of the electric drive system are studied.
Authors: V. N. Meshcheryakov, A. I. Boikov, V. V. Pikalov, A. A. Muravyev, D. V. Lastochkin
Direction: Electrical Engineering
Keywords: Asynchronous motor, phase rotor, parametric controller, inductive resistance, frequency converter, autonomous voltage inverter, software package MATLAB Simulink
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