Design of Three-Phase Induction Motor Starting Drive Based on Electromagnetic Torque Analysis

Abstract

The process of starting a three-phase induction motor consumes a very large
current from the power grid, which can cause voltage drops and damage the coil
insulators due to the heat generated. However, this has been overcome by using several
starting methods including star-delta starter, starter with autotransformer, soft starter,
and drive frequency or better known as VFD or VSD. In conventional soft starters, a
small reduction in voltage results in a sizable drop in electromagnetic torque. This can
cause a motor with a certain load to fail to start. In this research, a three-phase induction
motor soft starter modeling will be carried out using the method of setting the source
voltage and frequency, designed to overcome the low electromagnetic torque generated
by conventional soft starters. The modeling of the soft starter with thyristor control is
expected to produce high and stable electromagnetic torque. So that the soft starter with
thyristor control can be a solution for conventional soft starters.