Method of making isotropic bonded magnet

Details Method of making isotropic bonded magnet Method of making isotropic bonded magnet

1992-04-29

1995-11-07

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Producing or treating magnetic product precursor thereof

148101, 148105, H05B 100

Patent

active

054645760

ABSTRACT:
A method of manufacturing an inorganic bonding type rapidly solidified magnet, which is formed by energizing and sintering, after an instantaneous mutual attractive force has been applied intermittently in accordance with the electromagnetic force upon a thin piece shaped rapidly solidified magnet powder in a mold. A thin piece shaped inorganic glass having a thermal expansion ratio 9.times.10.sup.-6 /.degree. C. or less is used as the inorganic coupling agent. The magnet of the present invention having a ring shape, is effective to improve reliability as a rotor magnet in consideration of size, safety, mechanical strength, etc. of the present magnet formed in a ring shape. The electric resistance of the magnet is 10.sup.-3 through 10.sup.-1 .OMEGA.cm and is desirable as a rotor magnet of a PWM driving brushless electric motor.

REFERENCES:
patent: 4360382 (1982-11-01), Iijima et al.
patent: 4600555 (1986-07-01), Shimizu
patent: 4767474 (1988-08-01), Fujimura et al.
patent: 4840684 (1989-06-01), Fujimura et al.

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