Title:
MANUFACTURE OF RESIN BONDED PERMANENT MAGNET
Document Type and Number:
Japanese Patent JP2516176
Kind Code:
B2
Abstract:
PURPOSE: To provide sufficient orientation in relatively low magnetic fields by magnetizing a magnet powder in a magnetic field higher than the molding magnetic field, and molding a mixture of the magnet powder and thermoplastic resin by injection while applying the magnetic field.
CONSTITUTION: A magnet powder is magnetized in a magnetic field higher than the molding magnetic field, and a mixture of the magnet powder and thermoplastic resin is molded by injection while applying the magnetic filed, to obtain a resin bonded permanent magnet. The magnet powder uses at least one kind of hard ferrite and rare-earth cobalt magnet powders. In this method of manufacture the quantity of magnet powder should be 50-96wt.%; the mixture should be molded by injection while applying the magnetic field within the temperature range of 180-350°C; and the magnetization magnetic field should be 150Koe or above. This achieves sufficient orientation in relatively low magnetic fields, and improves the magnetic capability and temperature characteristic of resin bonded magnets without need for varying their component.
Inventors:
OZAKI RYUICHI
OKONOGI ITARU
SHIMODA TATSUYA
OKONOGI ITARU
SHIMODA TATSUYA
Application Number:
JP32883093A
Publication Date:
July 10, 1996
Filing Date:
December 24, 1993
Export Citation:
Assignee:
SEIKO EPSON CORP
International Classes:
B29C45/00; H01F1/03; H01F1/08; H01F41/02; B29L31/30; (IPC1-7): H01F41/02; B29C45/00; H01F1/08
Domestic Patent References:
| JP55105314A |
Attorney, Agent or Firm:
Kisaburo Suzuki (1 outside)
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