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Influence of magnet shaping on cogging torque of surface‐mounted PM machines
Author(s) -
Taghipour Boroujeni Samad,
Zamani Vahid
Publication year - 2016
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.2150
Subject(s) - cogging torque , armature (electrical engineering) , magnet , torque , finite element method , torque density , mechanical engineering , magnetic flux , magnetic field , mechanics , physics , materials science , engineering , structural engineering , thermodynamics , quantum mechanics
Summary In the presented work, influence of magnet shaping on cogging torque of surface‐mounted Permanent Magnet (PM) machines is investigated. The considered PM shape for the magnet shaping is the loaf‐shape PM with off‐set arcs. For the first time, based on the solution of the Poissons's equation, an analytical model is provided to predict the magnetic flux density of the slotted‐armature and surface‐mounted PM machines with the loaf‐shape PM. The influence of the slotted armature on the magnetic flux density is taken into account by considering the slot virtual surface currents. The geometry of the loaf‐shape PM is formulated and optimized to reach a design with a low value of the cogging torque. The machine cogging torque is computed by the Maxwell stress tensor. The obtained analytical model is used as the computational tool to find the dependence of the machine cogging torque on the PM geometry. Finally, the validity of the obtained results is verified by finite element analysis. Copyright © 2016 John Wiley & Sons, Ltd.