Research Progress and Prospect of High Electrical Resistivity NdFeB Permanent Magnetic Materials
NdFeB rare earth permanent magnetic material has excellent magnetic properties and has been wide-ly used in new energy,information,rail transit,as well as aerospace and other fields for a long time.The elec-trical resistivity of traditional NdFeB permanent magnetic material is low,and it is vulnerable to the action of al-ternating magnetic field in the service process of permanent magnet motor,which generates eddy current inside the magnet,causes high temperature rise,and leads to thermal demagnetization of the magnet,thus reducing the energy efficiency of the motor and even bringing major safety risks.Improving the electrical resistivity of NdFeB permanent magnet can reduce its eddy current loss and the temperature rise,which is a reliable way to solve the problem of thermal demagnetization of magnet.Therefore,the research and development of high electri-cal resistivity NdFeB permanent magnetic material has important social and economic value and scientific signifi-cance.This paper summarizes the research status of high electrical resistivity NdFeB permanent magnetic materi-al,and discusses and prospects the research and development of high electrical resistivity NdFeB permanent magnetic material.
rare earth permanent magnetic materialselectrical resistivitymagnetic propertiesmicrostructuralpermanent magnet motor
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