Title :
Analysis of NdFeB Bonded Magnet Behaviors Within High-Frequency Field and High Temperature Using Micromagnetic Simulator
Author :
Akagi, Fumiko ; Honkura, Yoshinobu
Author_Institution :
Dept. of Appl. Phys., Kogakuin Univ., Tokyo, Japan
Abstract :
Motors of hybrid vehicles and electric vehicles are anticipated to become smaller and have higher rotational speed. However, the small motors with high rotational speed may demagnetize the permanent magnets of motors by applying a high-frequency field of ~10 kHz at temperatures over 400 K. This demagnetization also depends on a static dc-field ~3-4 kOe. We call this demagnetization phenomena magnetic fatigue. In this paper, magnet behaviors within a high-frequency field and at high temperature were simulated using a micromagnetic simulator.
Keywords :
demagnetisation; electric motors; electric vehicles; fatigue; iron compounds; micromagnetics; neodymium compounds; permanent magnets; NdFeB; NdFeB bonded magnet behaviors; demagnetization phenomena; electric vehicle motors; high rotational speed; high-frequency field; hybrid vehicle motors; magnetic fatigue; micromagnetic simulator; permanent magnets; static dc-field; Demagnetization; Magnetic flux; Magnetization; Permanent magnets; Perpendicular magnetic anisotropy; Saturation magnetization; High-frequency field; Magnetic fatigue; NdFeB anisotropic bonded magnet; high frequency field; magnetic fatigue; permanent magnet;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2438439
