Abstract
The work solves an actual scientific problem, which consists in increasing the starting moment of a synchronous motor for reversing mechanisms with a significant moment of static resistance according to the simultaneous limitation of stator currents due to the use of a thyristor voltage regulator with the use of multi-stage compensation of the inertia excitation circuit. The problem of starting a powerful synchronous motor with current limitation does not lose its relevance, primarily for reversing mechanisms with a significant moment of static resistance, as well as in the conditions of powering the motors from long electrical networks, which is typical for drives of mechanisms of drilling rigs in the oil and gas industry, turbocompressors of gas pumping stations and quarry excavators.To evaluate the effect of the developed device on the start of a synchronous motor in the conditions of limiting the voltage of the power supply network with the help of a regulator, the calculated dependences of the motor start-up with a step change in the storage capacity depending on the slip are given.The static dependence of sliding on the moment M is presented, and the stator current is presented. The dynamic characteristics of the engine start using the proposed system and the direct asynchronous start with a tenfold additional resistor are presented.The use of the developed device made it possible to increase the electromagnetic moment developed by the engine from twice to 2.5 times the nominal one. As a result of the redistribution current load between the rotor circuits, the current in the damper winding at start-up decreased by an average of one rating in the longitudinal and transverse windings.
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