Interior PM Machines Using Ferrite to Replace Rare-Earth Surface PM Machines

Since the cost of rare-earth permanent magnets (PMs), such as NdFeB and SmCo, is more and more increasing, there is a great interest in designing PM machines without adopting such rare-earth PMs, i.e., replacing them with cheaper ferrite magnets. Referring to the interior PM (IPM) machines, the expe...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2014-03, Vol.50 (2), p.979-985
Main Authors: Barcaro, Massimo, Bianchi, Nicola
Format: Article
Language:English
Subjects:
Ferrite magnets
Ferrites
interior permanent-magnet (PM) (IPM) machines
machine design
Perpendicular magnetic anisotropy
PM machines
PM motors
PM-assisted reluctance (REL) machines
rare-earth magnets
Reluctance motors
Rotors
synchronous machines
Torque
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Summary:Since the cost of rare-earth permanent magnets (PMs), such as NdFeB and SmCo, is more and more increasing, there is a great interest in designing PM machines without adopting such rare-earth PMs, i.e., replacing them with cheaper ferrite magnets. Referring to the interior PM (IPM) machines, the expected performance reduction is limited owing to the anisotropic structure: The reluctance (REL) torque component compensates for the use of low-energy PMs. This paper investigates the convenience of adopting ferrite magnets in an IPM machine (sometimes also referred to as PM-assisted synchronous REL machine), instead of a rare-earth surface-mounted PM machine. It is shown that, even though a lengthening of the stack length is required, the anisotropic PM machine that adopts ferrite magnets may represent a valid competitor of a surface PM machine with rare-earth PMs.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2013.2272549