Abstract
It is known that skewed rotor structure for electrical machines can reduce torque ripple and radial force which will produce the unwanted vibration and noise, however, utilizing this structure can also affect other parameters of machine such as the average torque, the inductance, the flux-linkage and the magnetic energy and so on. This drawback always shows in the special and popular machines-switched reluctance motors. In this paper, different skewed angles of rotor and their effects on the key electromagnetic parameters are analyzed for switched reluctance motor. During the whole analysis process, three-dimensional finite element method is used to model, mesh, solve, and plot the results. Especially, the properties of the magnetic materials, the complex motor geometry, the effects of magnetic saturation and end windings were considered. Simulated and compared results show that an appropriate skewed angle selected can reduce the radial force largely but not make the average torque decreasing badly, which can be observed from the final conclusion: under the skewed angle of 5°, the radial force is reduced of 56.2%, the average torque is only reduced of 18.9%. So, if the target of designing for switched reluctance motors is to reduce the vibration and noise to be the most extent, then selecting an appropriate skewed structure for rotor shape is an effective way.