Efficiency Improvement with Solid State Starter for Three Phase Induction Motor Applications

Abstract

Three phase induction motor is a versatile machine for energy conversion. All three phase machine will operate with a starter. The Starter is a mechanical or electromechanical device. Starters are facilitating for easy on and off the motor, protect from excess load current, and safe from low or high supply voltage. Some of the starters have mechanism of reduce the starting input current to the motor. These are activated through mechanical or electromechanical components. The solid state starter eliminates the mechanical components action and working as static device. The a) moveable touch contactor, b) Thermal or magnetic overload relay, which through the load current flow, c) No volt coil, which is to be energized for plunger contactor are major components of the starter. The above components are consuming the power during the whole operational time of the motor. The solid state starter is minimizing the above power loss at great extent. The solid state starter activation speed also very high since the capture the voltage value, current value, temperature value and to and fro of control signals for operating the motor is based digital system. The applied voltage, load current, temperature of the motor are captured by sensors and fed to the PIC controller, and the star to delta conversion and power feed to the motor by activating GTO also implement by same PIC controller. This method of starting the motor has many advantageous such as reduce more loss and increase the efficiency, more reliability, effective sensitivity, compact size of the starter. The method of starting is executing with MATLAB simulation and physically verified as wellconfirmed.