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Switched Reluctance Motor ( Srm ) Essay

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Switched reluctance motor (SRM) has merits of rigid and simple structure, simple converter circuit with fault tolerance, high starting torque, premium speed regulation performance, high speed capability, high torque to inertia ratio. However, the SRM suffers from noticeable torque ripple due to discrete nature of the torque production, acoustic noises, high nonlinear characteristics due to the doubly saliency structure. The nonlinearity in the operation of the SRM complicates the analysis as well as the control of the motor [1-5]. Based on the modelling of SRM magnetic circuit, three models of SRM are found in literature: linear model, nonlinear model without mutual inductances, and nonlinear model with mutual inductances. Linear models in [6,7] are designed and simulated readily. On contrast nonlinear models are obtained after a large set of experimental tests to obtain the magnetic characteristics [8-15], or from a finite element method (FEM) analysis [16-18], which takes into consideration the saturation of rotor and stator materials. The nonlinear model is preferable when accurate precision is wanted. The converter used with SRM requires at least one switch per phase due to unidirectional phase current. This is a big advantage when compared to the converters for AC motor drives. Some configurations of converters used in SRM drives are presented in [19-22]. The half-bridge asymmetric converter is the most widely used for SRM drive applications, because of its high

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