Method and apparatus for magnetizing permanent magnet in magneti

Details Method and apparatus for magnetizing permanent magnet in magneti Method and apparatus for magnetizing permanent magnet in magneti

1974-07-12

1976-07-20

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

29594, 148108, 335231, H01F 1300

Patent

active

039710548

ABSTRACT:
The permanent magnet of a magnetic structure is formed of isotropic magnetic material, and is magnetized along the path that the flux follows during use of the magnetic structure to increase the efficiency of the magnetic structure in use. The magnetic structure, which may be the annular magnetic structure of an electrodynamic loudspeaker, includes a cylindrical permanent magnet and an annular cup-like return path element connected to the magnet at one end thereof and forming an air gap with the magnet at the opposite end. Apparatus is provided for magnetizing the permanent magnet having an annular portion which may extend into the air gap of the speaker magnetic structure, to provide curved magnetic lines in the permanent magnet in substantially the path of the operating flux to the air gap. The end of the magnet opposite the air gap may be mounted in a recess in the magnetic return path element and the magnetizing apparatus may engage the return path element about such end of the magnet to provide curved magnetizing lines in the part of the magnet which is set into the recess in the element.

REFERENCES:
patent: 3417295 (1968-12-01), Littwin
patent: 3440364 (1969-04-01), Parker
patent: 3550051 (1970-12-01), Parker

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