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车载永磁传感器件中NdFeB烧结永磁的稳定性分析

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Indexed by:Journal Papers

Date of Publication:2010-09-20

Journal:功能材料

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:41

Issue:9

Page Number:1664-1666

ISSN No.:1001-9731

Key Words:NdFeB烧结永磁;电磁干扰;振动;稳定性

Abstract:研究了电磁干扰、振动和温度等环境因素对NdFeB永磁性能的影响.研究结果表明:(1) 场强或频率越高,失效越大,而交变磁场比稳恒磁场更为严重;(2) 交变场下因涡流的"趋肤"效应,导致永磁出现不可逆的热退磁现象,当外场为30kA/m、500Hz干扰时,其失效瞬间即超过15%;(3) 振动和高温的共同作用干扰,使得退磁失效情况加剧.

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