EP 0390643 B1 19940420 - Transformer of the closed ferrite magnetic circuit type.
Title (en)
Transformer of the closed ferrite magnetic circuit type.
Title (de)
Transformator mit geschlossenem Ferrit-Magnetkreis.
Title (fr)
Transformateur du type à circuit magnétique fermé en ferrite.
Publication
Application
Priority
FR 8903985 A 19890328
Abstract (en)
[origin: JPH02281720A] PURPOSE: To suppress generation of noise due to magnetic distortion, by filling in an air gap with a packing material of a single component having a prescribed Shore hardness with respect to temperature. CONSTITUTION: An air gap 6 of the transformer consisting of a ferrite-made magnetic closed circuit is filled in with a packing material 15 of a single component having a prescribed Shore hardness with respect to temperature. The packing material 15 desirably has a Shore hardness of 30 at 25 deg.C, and a polysulfide group packing material or a polyurethane group packing material is adopted for the material 15. The single component packing material is of self-adhesion, sufficiently flexible to cushion vibration and cured without causing contraction due to the lapse of time. Thus, generation of unpleasant noise due to magnetic distortion is suppressed.
IPC 1-7
IPC 8 full level
H01F 30/00 (2006.01); H01F 3/14 (2006.01); H01F 27/24 (2006.01); H01F 38/08 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP US)
H01F 3/14 (2013.01 - EP US)
Citation (examination)
EP 0315527 A1 19890510 - OREGA ELECTRO MECANIQUE [FR]
Designated contracting state (EPC)
DE ES FR GB IT NL SE
DOCDB simple family (publication)
EP 0390643 A1 19901003; EP 0390643 B1 19940420; DE 69008226 D1 19940526; DE 69008226 T2 19940804; ES 2051480 T3 19940616; FR 2645336 A1 19901005; FR 2645336 B1 19910607; HK 26095 A 19950310; JP 2945061 B2 19990906; JP H02281720 A 19901119; US 5025241 A 19910618
DOCDB simple family (application)
EP 90400760 A 19900320; DE 69008226 T 19900320; ES 90400760 T 19900320; FR 8903985 A 19890328; HK 26095 A 19950302; JP 8058190 A 19900328; US 48076390 A 19900216