Title :
The effects of thermal cycling on aging of Neodymium-Iron-Boron magnets
Author :
Huger, Daniel ; Gerling, Dieter
Author_Institution :
Inst. for Electr. Drives & Actuators, Univ. of the Armed Forces Munich, Neubiberg, Germany
Abstract :
In this paper, the effects of temperature cycling on Neodymium-Iron-Boron (NdFeB) magnet aging are investigated. An accelerated lifetime test is parameterized and performed. In order to separate the aging mechanism, the temperature limits given by the manufacturer are not exceeded and the thermal aftereffects, observed during the first cycles, are separated. 80 magnets with four different temperature indices and coatings are tested. The required heating and cooling half-cycle times are measured. It is proven than no secondary aging mechanisms distorts the results. A Coffin-Manson-type aging well known from other aging mechanisms and a logarithmic drop in remanence and coercive force is shown.
Keywords :
ageing; coercive force; cooling; heating; magnets; Coffin-Manson-type aging; NdFeB; coercive force; cooling half-cycle times; heating half-cycle time; neodymium-iron-boron magnet aging; thermal cycling; Aging; Coatings; Magnetic circuits; Magnetic flux; Magnetic separation; Magnetomechanical effects; Temperature measurement;
Conference_Titel :
Power Electronics and Drive Systems (PEDS), 2015 IEEE 11th International Conference on
Conference_Location :
Sydney, NSW
DOI :
10.1109/PEDS.2015.7203464
