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Review of Design Solutions for Internal Permanent-Magnet Machines Cogging Torque Reduction

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5 Author(s)
Bianchini, C. ; DISMI, Univ. of Modena & Reggio Emilia, Reggio Emilia, Italy ; Immovilli, F. ; Lorenzani, E. ; Bellini, A.
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Internal permanent-magnet synchronous machines are spreading in industrial production. They feature high torque density and extended speed range that are key issues in many fields of applications, however their cogging torque is typically quite high. Many methods and design guidelines for cogging torque reduction exist in literature and this paper compares them. For this purpose, the different design guidelines are applied to a common reference machine in order to assess their effectiveness. Computer finite element analysis (FEA) are carried out for each case in order to compare the cogging torque reduction capability of the different techniques. The side effects of these techniques, such as back-EMF and rated torque profile distortions, will be taken into account. The paper contribution is to compare the various cogging torque reduction techniques and magnetic geometries on a common reference machine to identify the most effective ones.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 10 )

Date of Publication:

Oct. 2012

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