Abstract
In the electric drive designed on the basis of an asynchronous motor with a phase rotor it is proposed to regulate the rotor current using the rectifier-inverter unit. The input of the rectifier is connected to the terminals of the rotor winding of the motor and the output of the inverter performed on the basis of IGBT-transistors with reverse diodes is connected to the frequency-dependent inductive-active resistance. A capacitive filter is included in the DC link. In the electric drive system, the installed soft-start of the asynchronous motor with a phase rotor is implemented with the possibility of regulating and maintaining the constancy of the starting torque to ensure the required acceleration. It is proposed to use such an electric drive system on conveyors of metallurgical production, which often do not require speed control, but providing starting modes with a predetermined rate of acceleration including when the conveyor is fully loaded. The electric drive system combines some properties of asynchronous valve cascade and parametric control systems. The operation of the inverter control system is described, it implements stabilization of the rotor current of an induction motor by changing the frequency at the output of the voltage inverter as a function of the rectified current of the motor rotor. Frequency-dependent inductive-active resistance, referred to as induction resistance, contains a massive magnetic core with three tubular rods connected by a yoke and each rod has a single-layer phase winding. The wall thickness of the tubular rods does not exceed the depth of penetration of the electromagnetic field into the massive ferromagnetic material. The results of experimental studies of the frequency characteristics of the induction resistance are presented. The mathematical model of the electric drive system is developed, computer simulation of dynamic processes is carried out using the MATLAB Simulink application software package. The possibility of implementing the proposed method of controlling the process of starting an induction motor with the stabilization of the starting torque has been proven.
Keywords
Induction motor with phase rotor, starting torque, rectifier, inverter, filter, induction resistance.
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