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Date of Publication:2010-01-01

Journal:功能材料

Issue:9

Page Number:1664-1666

ISSN No.:1001-9731

Abstract:The effects of electromagnetic disturbance, vibrating and temperature on the permanent magnetic properties were investigated. The results show that (1) the magnetic properties decrease as external magnetic field or frequency increase, and the magnetic loss gets more in alternating magnetic field; (2) The irreversible thermal demagnetization of the permanent magnets would happened, due to skin effect of eddy current in alternating magnetic field. Demagnetization would be raised rapidly over 15% when being in 30kA/m, 500Hz magnetic field; (3) Demagnetization raised larger as magnets were affected by both vibrating and high temperature.

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