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Analysis of surface permanent magnet machines with fractional-slot concentrated windings

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3 Author(s)
A. M. El-Refaie ; Electr. Machines & Drives Lab., GE Global Res. Center, Niskayuna, NY, USA ; T. M. Jahns ; D. W. Novotny

This paper presents a closed-form analytical technique for analyzing surface PM machines equipped with fractional-slot concentrated windings. Since this class of winding configuration deviates significantly from conventional sinusoidal distributions, classical steady-state phasor or dq analytical techniques cannot be used to provide accurate results. The presented analytical model provides a fast and reliable method to analyze and compare candidate machine designs. Stator slotting effects are taken into consideration and a wide range of concentrated winding configurations can be analyzed. This technique is capable of analyzing the machine both below (constant-torque) and above (flux-weakening) base speed. Average torque, cogging torque, and ripple torque are all evaluated. Analytical results are verified using finite element analysis.

Published in:

IEEE Transactions on Energy Conversion  (Volume:21 ,  Issue: 1 )