Use of a conductor screen to magnetize NdFeB magnets

Author

Wallace, R.R. ; Fierro, V.D. ; Moran, L.A. ; Lipo, T.A.

Author_Institution

Dept. of Electr. Eng., Concepcion Univ., Chile

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

2153

Lastpage

2155

Abstract

The magnetizer presented in this paper consists of a magnetic core made with silicon iron sheets with a large airgap in which the permanent magnets to be magnetized are located, This magnetic structure is energized by two symmetrical coils placed on the central leg above and below the airgap. The cross section of the airgap is four times the area of the permanent magnet, so with a copper plate that surrounds the magnet (not completely), effective concentration of the flux density lines is obtained. The copper plate was called “electromagnetic conductor screen”. The capacitor-discharge-bank was rated 1080 μF, 2000 V and 3.5 tesla were obtained in the central airgap. The paper presents the experimental results and theoretical analysis used to evaluate the conductor screen time-constant of the proposed magnetizing system

Keywords

boron alloys; coils; electromagnetic shielding; ferromagnetic materials; iron alloys; magnetic cores; magnetic flux; magnetisation; neodymium alloys; permanent magnets; 1080 muF; 2000 V; 3.5 tesla; NdFeB; airgap; central airgap; conductor screen; flux density lines; magnetic core; magnetic structure; magnetizer; permanent magnets; symmetrical coils; time-constant; Coils; Conductors; Copper; Iron; Leg; Magnetic analysis; Magnetic cores; Magnetic flux; Permanent magnets; Silicon;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706834

Filename

706834