Hysteresis Losses in Sintered NdFeB Permanent Magnets in Rotating Electrical Machines

Author

PyrhoÌˆnen, Juha ; Ruoho, Sami ; Nerg, Janne ; Paju, Martti ; Tuominen, Sampo ; KankaanpaÌˆaÌˆ, Harri ; Stern, Raivo ; Boglietti, Aldo ; Uzhegov, Nikita

Author_Institution

Dept. of Electr. Eng., Lappeenranta Univ. of Technol. (LUT), Lappeenranta, Finland

Volume

62

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

857

Lastpage

865

Abstract

Permanent magnet (PM) materials are nowadays widely used in the electrical machine manufacturing industry. The eddy-current loss models of PMs used in electrical machines are frequently discussed in research papers. In magnetic steel materials we have, in addition to eddy-current losses, there are hysteresis losses when alternating current or a rotating flux travels through the material. Should a similar phenomenon be also taken into account in calculating the losses of PMs? 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.

Keywords

eddy current losses; electric machines; iron compounds; neodymium compounds; permanent magnets; NdFeB; PM materials; alternating current; eddy-current loss models; electrical machine manufacturing industry; hysteresis losses; magnetic steel materials; rotating electrical machines; rotating flux; sintered permanent magnets; Magnetic circuits; Magnetic field measurement; Magnetic flux; Magnetic hysteresis; Permanent magnets; Soft magnetic materials; Hysteresis; PM; PM losses; PM material; hysteresis in permanent magnets (PMs);

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2014.2354597

Filename

6891224