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Minimizing torque ripple in permanent magnet synchronous motors with polymer-bonded magnets

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5 Author(s)
Borghi, Carlo A. ; Dept. of Electr. Eng., Bologna Univ., Italy ; Casadei, D. ; Cristofolini, Andrea ; Fabbri, M.
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The paper presents a method for determining the main design parameters of a permanent magnet (PM) motor that will reduce the total torque ripple. First, the magnet arrangement is derived by one-dimensional field analysis coupled with a multiobjective minimization technique. Then, a two-dimensional model is used to further optimize the magnet arc width and minimize the cogging torque. The analysis mainly focuses on a rotor that is completely covered by the permanent magnets. In this configuration, the permanent magnets can be made from a tube of polymer-bonded magnet, and manufacture of the motor is greatly simplified. We present experimental tests of a machine manufactured on the basis of our design procedure

Published in:

Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 2 )

Date of Publication:

Mar 2002

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