Winding Factors and Magnetic Fields in Permanent-Magnet Brushless Machines With Concentrated Windings and Modular Stator Cores

Greg Heins, D Ionel, Mark Thiele

    Research output: Contribution to journalArticle

    Abstract

    Removing some sections of the stator yoke in a permanent-magnet brushless machine can be beneficial for reducing punching waste and simplifying motor manufacture. However, in some cases, restricting the possible flux paths, in this way, will have a detrimental impact on the torque and air-gap harmonics. This paper discusses the potential implications of modular stator core arrangements and presents the air-gap flux density harmonics and winding factors for potential slot/pole combinations. Finite-element analysis (FEA) simulations are presented to support the analytical calculations. The analysis indicates that the performance reduction from using a modular stator is minimal when the number of slots and poles are similar but drops off substantially when this is not the case. A modular core stator will increase the MMF subharmonics due to the magnet field but can reduce the subharmonics due to the armature if a single-layer winding is used. The effect of slotting is very similar for a modular and conventional core machine, and FEA results match previously published analytical analyses. � 2015 IEEE.
    Original languageEnglish
    Article number15292164
    Pages (from-to)2924-2932
    Number of pages9
    JournalIEEE Transactions on Industry Applications
    Volume51
    Issue number4
    Early online date21 Jan 2015
    DOIs
    Publication statusPublished - 2015

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