“A Study of Response of Switched Reluctance Motor SRM In Sensor-Based and Sensor-Less Control Mode”
Abstract: – This paper aims at implementing a Switched Reluctance Motor drive in sensor-based mode using dsPIC30F6010 motor control demo-board. For this purpose, initially the sensor-based and sensor-less control technique for the SRM drive have been studied. The simulation model in sensor-based operation has been developed in SIMULINK/MATLAB environment and the responses of the drive for different load torques and reference speeds have been obtained. The impact of varying firing angles, ON and OFF, of the control devices in each of the phases also has been analyzed. The sensor-less control technique that has been used here is Fluxcurrent-theta method. This has also been simulated in the SIMULINK/MATLAB environment. Initially, the motor is run in stepper mode and later on it is run in open-loop with the help of rotor position signals. The sensor-based scheme also has been successfully implemented with outer speed loop and inner current loop.
Keywords – Switched reluctance motor drives, sensor-based mode, sensor-less mode, control strategies, MATLAB/SIMULINK.
INTRODUCTION
The first acknowledged application of Switched Reluctance Motor (herein after referred to as “SRM”) dates back to 19th century [1]; its development since then has been hampered by the non-availability of fast switching devices. However there have been some vast improvements of the power electronics drive technologies that have made a great success in achieving adjustable speed drives with Switched Reluctance Motor.Over the last two decades,continuous research and development efforts have led to evolution of SRM drive systems suitable for commercial production. Technological breakthrough in the field of power semiconductor devices, digital signal processing and solidstate control of electrical motors [2,3] has revolutionized variable/adjustable speed drive systems. Recently, SRM drives have received considerable attention from the researchers and the drive industry due to their various attractive features. The SRM is a viable candidate for variable speed applications because of its high torque density, low inertia, quick response, low loses, wide speed range capability, simple control and low overall cost.