Research of a Soft Starter of an Induction Motor Based on Multi-Zone Transistor AC Voltage Regulator

The widespread use of induction motors (IM) for domestic and industrial purposes is determined by a simple and clear structure. The complexity of the development and production of energy-saving soft-start structures for high-voltage IM is relevant due to the presence of deep voltage drops in the mains caused by large starting currents with direct connection. Currently, resistive and frequency start-up circuits are used. Multi-zone regulation is based on the principle of a smooth increase in power supply. In this paper, we propose an algorithm for limiting the starting current of induction motors and a method for developing a soft starter of induction motors based on a multi-zone transistor AC voltage regulator (RAV) by means of electromagnetic process analysis.