Sensorless Control Research For Switched Reluctance Motor Based On DSP

The Switched Reluctance Motor (SRM) has been widely applied in many fields because of the advantages of simple structure, flexible control strategy, high reliability and low cost, etc. Switched reluctance drive system (SRD) is a new drive system with high potential after the application of AC or DC motor drive system. The running of SRM is controlled under exciding different phase windings by appropriate sequence, thus the position detection is a very important part of the control system. But the conditional position-sensor causes the SRM performance to the certain limitation, which rises the cost and adds the complexity of SRD. As a result, the sensorless for control of SRM has become one major direction in the study of SRD.Firstly, this thesis analyzes the structure and fundamental operating principle of SRM. Using the linear inductance model of SRM, a simulation model of SRD was built up. And then based on the micro-stepping driving of stepping motor, addressed a design for reducing torque ripple in SRD. By subdivided each phase current while changing the phase, then generates some torque vectors in the space, and controls current of phases to make the torque continuity. Compares various methods of sensorless position control through analyzing lots of study results and literatures. In this thesis, the sliding mode observer (SMO) based on state observer was proposed, which only needs the measurement of phase voltage and current to estimate motor position and speed. Simulation results demonstrate the applicability and robustness. Finally, the design of hardware with TMS320LF2407A and simple frame of software were given.