Permanent magnet and magnetization apparatus for producing the p

Details Permanent magnet and magnetization apparatus for producing the p Permanent magnet and magnetization apparatus for producing the p

1990-02-07

1993-04-06

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

H01F 720, H01F 1300

Patent

active

052007294

ABSTRACT:
Disclosed is a permanent magnet which is suitable for use for a field system of an electric motor or the like and which is constituted by a single piece of magnetic material in which S and N poles are alternately continuously formed through non-magnetic flux regions or weak magnetic flux regions interposed therebetween, and further disclosed is a magnetization apparatus for magnetizing such a permanent magnet. The magnetization apparatus comprises a first magnetic flux generation unit provided on one surface of a single piece of magnetic material for generating N-pole magnetic flux, a second magnetic flux generation unit provided adjacently to the first magnetic flux generation unit on the one surface for generating S-pole magnetic flux, and a third magnetic flux generation unit provided between the first and second magnetic flux generation unit on the one surface for passing therethrough part of magnetic flux generated by the first and second magnetic flux generation unit and for generating magnetic flux for canceling the magnetic flux passing through the third magnetic flux generation unit, whereby N and S poles are formed in domains of an object to be magnetized opposite to the first and second magnetic flux generation units and non-magnetic flux regions or weak magnetic flux regions are formed in domains of the object to be magnetized opposite to the third magnetic flux generation unit.

REFERENCES:
patent: 3270264 (1966-08-01), Miner
patent: 4494028 (1985-01-01), Brown
patent: 4614929 (1986-09-01), Tsukuda et al.
patent: 4806837 (1989-12-01), Ito

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