Performance Analysis of Switched Reluctance Motor by Using Closed Loop Current Control Technique

Abstract

This paper presents the performance analysis of an 6/4 3-phase switched reluctance motor in terms of current, flux, torque and speed. When the speed of the motor is low the current rises quickly. If the speed is large the increase in current is low. In low-speed region, the current can be controlled by using chop/hysteresis current control mode. In this mode a voltage of +Vdc and -Vdc is applied in such way the current is limited to a band. The bands can design around the reference value of current. The upper and lower bands can be designed based on the reference current. After the base speed we have to maintain current, current can’t increase quickly because speed becomes large, so in this region instead of keeping current constant the power is to be considered constant. When the speed is large this mode is not preferable. So still we have to maintain the power current has to build up, so we switch little earlier that angle is called advance angle. Angle by which voltage application is advanced that angle is the advance angle. The advance angle control can be used in such way that the current increase will happen in the lower inductance region only. The advancing of angle can be increased up to certain angles only i.e up to the lower value of inductance minimum point. The simulation has been carried out for 6/4 3-phase switched reluctance motor using MATLAB/ Simulink by applying closed loop current control technique. The detailed control of SRM for different speed modes has been carried out and the analysis of results demonstrated.