Abstract
Electric drive systems based on an induction squirrel-cage motor powered by a frequency converter are used in various mechanisms for general industrial and specialized purposes. To expand the scope of application for frequency induction motors with a squirrel-cage rotor on automated production units, it is necessary to increase the stability of the torque generated by the motor during unit startup. Therefore, the problem of research and development of controlled automated electric drives based on squirrel-cage induction motors remains relevant. Increasing the energy efficiency of induction electric drives with vector control can be achieved through the introduction of correction means, which is a promising technical solution that meets the increasing demands of modern production. The work investigates a frequency induction electric drive system that stabilizes engine torque during start-up by constructing an acceleration control loop, determined on the basis of differentiating the signal received from the speed sensor, with relay control of an additional adjustable power transistor switch in the DC link of the frequency converter. The main task presented in the study is the creation of a system and algorithm for controlling an additional pulse switch in the DC link of a frequency converter whose operation is compatible with the vector control system of the inverter. The best stabilization of the starting torque implements the function of protecting equipment from possible overloads and ensures the unit increased stability. The use of the developed system for correcting the inverter input voltage in the acceleration function of the electric drive makes it possible, in the starting mode, to reduce torque fluctuations and reduce current consumption.
Keywords
motor, vector control system, relay regulators, correction, starting torque, transistor switch, energy efficiency, electric drive, alternating current
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