Hysteresis Losses in Sintered NdFeB Permanent Magnets in Rotating Electrical Machines
Pyrhönen, Juha; Ruoho, Sami; Nerg, Janne; Paju, Martti; Tuominen, Sampo; Kankaanpää, Harri; Stern, Raivo; Boglietti, Aldo; Uzhegov, Nikita (2015)
Juha Pyrhönen, Sami Ruoho, Janne Nerg, Martti Paju, Sampo Tuominen, Harri Kankaanpää, Raivo Stern, Aldo Boglietti, Nikita Uzhegov (2015) Hysteresis Losses in Sintered NdFeB Permanent Magnets in Rotating Electrical Machines. IEEE Transactions on Industrial Electronics 01/2015; 62(2):857-865. DOI:10.1109/TIE.2014.2354597
used in the electrical machine manufacturing industry. Eddy
current loss models of permanent magnets used in electrical
machines are frequently discussed in research papers. In
magnetic steel materials we have, in addition to eddy current
losses, hysteresis losses when AC or a rotating flux travels
through the material.
Should a similar phenomenon also be taken into account in
calculating the losses of permanent magnets? Actually, every now
and then authors seem to assume that some significant hysteresis
losses are present in rotating machine PMs. This paper studies
the mechanisms of possible hysteresis losses in PMs and their role
in PMs when used in rotating electrical machines.
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