Position Sensorless Control Of Switched Reluctance Motor

Switched Reluctance Motors(SRM), which have advantages such as a small and solid structure and low cost, achieve good control performance with the support of highly development of power electronics and control technology. It is necessary to obtain reliable and precise information of rotor positions for running of an SRM. However, installing a position sensor in a Switched Reluctance Motor Drive will lower the firmness of the whole system and increase the cost at the same time. For this reason, position sensorless control of SRM has drawn a lot of attention from experts and researchers of SRM. This is also the key point of this dissertation.First of all, this dissertation refers to the basic structure and operating principles of SRM and then describes three equivalent models including the linear model, the quasi-linear model and the nonlinear model.Secondly, this dissertation presents several basic Switched Reluctance Motor Drives and their components. Then, the dissertation describes a close-loop torque controller of SRM, and designs a simulation model of the whole system and analyzes the simulation result.Thirdly, this dissertation categorizes theories of position sensorless control of SRM into 4 types and studies each theory in detail. It proposes new algorithms for pulse injection method and inductance space vector method. Especially, it studies the position sensorless controller based on ANN. The dissertation researches the result of SRM modeling by ANN in detail and proposes a new algorithm for position sensorless control based on ANN, whose performance gets highly-promoted because of introduction of a fuzzy logic controller for ANN. This dissertation simulates these new algorithms using Matlab\Simulink and compares the results of them.Finally, this dissertation designs a drive circuit, a power converter, a detection circuit and a dsPIC33FJ32MC204 control circuit for a 40 W 6\4 poles Switched Reluctance Motor. Then, it designs the software flow for the whole control system. Several related experiments are executed on this system and their results are showed in the dissertation.