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Analysis of Rotor Core Eddy-Current Losses in Interior Permanent-Magnet Synchronous Machines

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3 Author(s)
Seok-Hee Han ; Dept. of Electr. & Comput. Eng., Univ. of Wisconsin, Madison, WI, USA ; Jahns, T.M. ; Zhu, Z.Q.

This paper presents the results of an investigation focused on the rotor core eddy-current losses of interior permanent-magnet (IPM) synchronous machines. First, analytical insight into the rotor core eddy-current losses of IPM machines is developed. Next, major design parameters that have the most significant impact on the rotor core eddy-current losses of IPM machines are identified. Finite-element analysis results are then presented to compare the predicted eddy-current losses in the machine core of IPM machines with one- and two-layer rotors coupled with concentrated- and distributed-winding stators. It is shown that the lowest total eddy-current losses in the machine core are achieved using a combination of distributed stator windings and two magnet layers per rotor pole, whereas minimizing only the rotor core eddy-current losses favors replacement of the rotor with a single-layer configuration.

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Industry Applications, IEEE Transactions on  (Volume:46 ,  Issue: 1 )