Title:
電気チョーク
Document Type and Number:
Japanese Patent JP4318756
Kind Code:
B2
Abstract:
An electrical choke comprises a magnetic amorphous metal core having, in combination, a distributed gap and a discrete gap. The amorphous metal is an iron based, rapidly solidified alloy. The distributed gap configuration is achieved by subjecting the magnetic core to a heat treatment, causing partial crystallization of the amorphous alloy. Such partial volume crystallization reduces the permeability of the magnetic core from several thousands to a value ranging from 200 to 800. The discrete gap is introduced by cutting the core and inserting a spacer. Depending on the width of the gap and the value of the annealed permeability, effective permeabilities in the range of 200 to 40 can be achieved. Advantageously, the reduced permeability magnetic core maintains its initial permeability under DC bias field excitation and exhibits low core loss, making it especially suited for use in power factor correction applications.
Inventors:
Collins, Aliki
John Sylgayris
Farley, peter
Hasegawa, Ryusuke
John Sylgayris
Farley, peter
Hasegawa, Ryusuke
Application Number:
JP54077898A
Publication Date:
August 26, 2009
Filing Date:
March 18, 1998
Export Citation:
Assignee:
Methograss Incorporated
International Classes:
H01F27/24; H01F37/00; H01F3/14; H01F27/25; H01F27/34; H01F41/02
Domestic Patent References:
| JP6074412A | ||||
| JP4367202A | ||||
| JP3125405A | ||||
| JP62194604A | ||||
| JP5335154A | ||||
| JP8279423A |
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fujihiro Kanda
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fujihiro Kanda