NDLI: Concentrated winding axial flux permanent magnet motor with plastic bonded magnets and sintered segmented magnets

Content Provider	IEEE Xplore Digital Library
Author	Jussila, H. Salminen, P. Parviainen, A. Nerg, J. Pyrhonen, J.
Copyright Year	2008
Description	Author affiliation: AXCO-Motors Oy, Lappeenranta (Parviainen, A.) \|\| Elec. Eng. Dept., Tech. Univ. of Lappeenranta, Lappeenranta (Jussila, H.; Salminen, P.; Nerg, J.; Pyrhonen, J.)
Abstract	Direct drive axial flux permanent magnet (PM) motors are a cost effective and an energy saving choice for industrial use. Open slots make concentrated winding machines a favourable configuration with respect to manufacturing. However, open slots expose rotor surface magnets to large flux pulsations and the losses of sintered magnets may not be neglected. Plastic bonded magnets have very low eddy current losses but other magnetic properties of such magnet materials are not satisfactory at the moment. Divided sintered neodymium iron boron (NdFeB) may be used instead but the magnet configuration must be carefully analyzed to attain an acceptable eddy current losses level in the magnets. This paper addresses permanent magnet rotor constructions, which eliminate or remarkably reduce eddy-current losses in the magnets of a 2500 $min^{-1}$ / 3000 $min^{-1},$ 37 kW permanent magnet synchronous motor with concentrated windings. Different magnet materials, such as plastic-bonded Neo-magnets and sintered segmented NdFeB-magnets are evaluated. Also a prototype motor with plastic bonded magnets has been built. Analytical Matlabtrade- and finite-element-method-based (Flux2D/3Dtrade by Cedrat) programs are used in the calculations. The permanent magnets should be segmented into many small sections in the Machine which the flux pulsations in the magnets are high.
Starting Page	1
Ending Page	5
File Size	303981
Page Count	5
File Format	PDF
ISBN	9781424417353
DOI	10.1109/ICELMACH.2008.4799939
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-06
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Costs Rotors Permanent magnet motors Synchronous motors Magnetic materials Magnetic analysis Plastics Magnetic losses Bonding Eddy currents
Content Type	Text
Resource Type	Article

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