EP0307372A2 - Elektrischer Hochleistungswiderstand - Google Patents

Elektrischer Hochleistungswiderstand Download PDF

Info

Publication number
EP0307372A2
EP0307372A2 EP88830360A EP88830360A EP0307372A2 EP 0307372 A2 EP0307372 A2 EP 0307372A2 EP 88830360 A EP88830360 A EP 88830360A EP 88830360 A EP88830360 A EP 88830360A EP 0307372 A2 EP0307372 A2 EP 0307372A2
Authority
EP
European Patent Office
Prior art keywords
cutouts
electric power
power resistor
metallic plate
expanded regions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88830360A
Other languages
English (en)
French (fr)
Other versions
EP0307372A3 (en
EP0307372B1 (de
Inventor
Giovanni Fornari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TELEMA SpA
Original Assignee
TELEMA SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11188249&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0307372(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by TELEMA SpA filed Critical TELEMA SpA
Publication of EP0307372A2 publication Critical patent/EP0307372A2/de
Publication of EP0307372A3 publication Critical patent/EP0307372A3/en
Application granted granted Critical
Publication of EP0307372B1 publication Critical patent/EP0307372B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
    • H01C3/10—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration
    • H01C3/12—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration lying in one plane

Definitions

  • the resistive electric element is generally defined by a metallic plate or grid constituted by a plurality of cutouts in turn defining a plurality of coils which increase the length of the resistive path without changing its dimensions and therefore determine the value of the electrical resistance of the resistor.
  • resistors often reach high temperatures as the balance between the heat produced during each second and the heat simultaneously released by the surface of the resistor to the outer environment is no longer maintained.
  • the temperature increase of the resistor which causes the expansion of the material which composes it, determines the disadvantage that the coils, by deformating, may make mutual contact, causing a short circuit which disables the resistor, with the consequence of inactivating the entire circuit to which it belongs.
  • the aim proposed by the present invention is to eliminate the disadvantages described above by providing an electric power resistor particularly usable for electric resistances in general which is capable of working without trouble even at high temperatures without being subject to short circuits which cause the interruption of the operation of the electric circuit in which it is interposed and without having reinforcement elements which encapsulate the coils.
  • an important object of the invention is to provide an electric power resistor the grid whereof is adapted to excellently withstand electric power overloads during its operation.
  • Not least object of the invention is to provide an electric power resistor which has optimum operation even if subject to any vibrations due to external factors.
  • an electric power resistor particularly usable for electric resistances in general comprising a metallic plate having a plurality of cutouts defining a plurality of non-encapsulated and co-planar coils, characterized in that said cutouts are arranged symmetrically on said metallic plate and have, at their ends, an expanded region having a substantially circular configuration adapted to allow an increase in the cross section affected by the flow of the current between one coil and the next, drastically reducing the temperature of the so-called "hotpoints", together with the uniform longitudinal expansion of said plate.
  • the electric power resistor according to the invention comprises a metallic plate, generally indicated by the reference numeral 2, having a plurality of cutouts defining a plurality of coils 3 which are advantageously not encapsulated and are mutually co-planar.
  • the plurality of mutually equidistant cutouts comprises a first set of cutouts and a second set of cutouts respectively indicated by the reference numerals 4 and 5.
  • Both the first set of cutouts 4 and the second set of cutouts 5 have, at their ends, an expanded region 6 having a substantially circular configuration, adapted to allow an increase in the cross section affected by the flow of current between one coil and the next so as to allow, in the so-called "hotpoints", a drastic decrease in temperature.
  • the expanded regions 6 furthermore advantageously allow a uniform longitudinal expansion of the metallic plate 2 since their arrangement, together with the arrangement of the cutouts 4 and 5 on the metallic plate, determines a configuration which allows equal elasticity in expansion and displacement for each coil.
  • the first set of cutouts 4 extends from the longest edges 7 of the metallic plate towards the interior thereof and each cutout has, at its facing ends, the expanded region 6.
  • the second set of cutouts 5 is instead defined in a substantially central region of the metallic plate and has the expanded region 6 at both ends.
  • the expanded regions 6 of the cutouts of the first set 4 and of the second set 5 are conveniently all mutually aligned except for the expanded regions 6a which are proximate to, and aligned with, at least one hole 8, not an end one, adapted for one or more central stiffenings of the metallic plate, according to its longitudinal extension, adapted to prevent its concave or convex deformation during its operation.
  • the expanded regions 6a aligned with the holes 8 are spaced from each of said holes by an extent equal to half the distance occurring between two expanded regions 6 of two aligned cutouts 4 in the absence of holes 8.
  • the expanded regions 6 of the cutouts 5 are spaced from the edges 7 of the metallic plate by an amount which is substantially equal to half the spacing of the facing expanded regions 6 of the cutouts 4.
  • the electric power resistor particularly usable for resistances in general, is particularly advantageous in that it allows a uniform longitudinal expansion of the coils, allowing the latter to remain mutually co-planar without having to be encapsulated in reinforcement elements and therefore in that it prevents the occurrence, also due to these last, of a contact between coils which would cause a short circuit which would disable said resistor.
  • the materials employed, as well as the dimensions, may be any according to the requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Resistors (AREA)
EP88830360A 1987-09-11 1988-09-07 Elektrischer Hochleistungswiderstand Expired - Lifetime EP0307372B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8721887A IT1222646B (it) 1987-09-11 1987-09-11 Resistore elettrico di potenza particolarmente utilizzabile per resistenze elettriche in genere
IT2188787 1987-09-11

Publications (3)

Publication Number Publication Date
EP0307372A2 true EP0307372A2 (de) 1989-03-15
EP0307372A3 EP0307372A3 (en) 1990-01-17
EP0307372B1 EP0307372B1 (de) 1994-03-09

Family

ID=11188249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88830360A Expired - Lifetime EP0307372B1 (de) 1987-09-11 1988-09-07 Elektrischer Hochleistungswiderstand

Country Status (3)

Country Link
EP (1) EP0307372B1 (de)
DE (1) DE3888266T2 (de)
IT (1) IT1222646B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105702400A (zh) * 2016-03-31 2016-06-22 湖南福德电气有限公司 一种适用于大电流限制直流分量电阻器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950867C (de) * 1939-12-06 1956-10-18 Sachsenwerk Licht & Kraft Ag Aus Blechstreifen bestehender Widerstandskoerper
DE1665211A1 (de) * 1966-04-28 1970-10-08 N Izsledovatelski I Pk I Elekt Geripptes gestanztes Widerstandselement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950867C (de) * 1939-12-06 1956-10-18 Sachsenwerk Licht & Kraft Ag Aus Blechstreifen bestehender Widerstandskoerper
DE1665211A1 (de) * 1966-04-28 1970-10-08 N Izsledovatelski I Pk I Elekt Geripptes gestanztes Widerstandselement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105702400A (zh) * 2016-03-31 2016-06-22 湖南福德电气有限公司 一种适用于大电流限制直流分量电阻器
CN105702400B (zh) * 2016-03-31 2018-07-03 湖南福德电气有限公司 一种适用于大电流限制直流分量电阻器

Also Published As

Publication number Publication date
EP0307372A3 (en) 1990-01-17
IT1222646B (it) 1990-09-05
IT8721887A0 (it) 1987-09-11
DE3888266D1 (de) 1994-04-14
DE3888266T2 (de) 1994-08-11
EP0307372B1 (de) 1994-03-09

Similar Documents

Publication Publication Date Title
US6282072B1 (en) Electrical devices having a polymer PTC array
US6392528B1 (en) Circuit protection devices
US3541491A (en) Electrical resistors
US20060250208A1 (en) Dual protection device for circuits
SE427782B (sv) Elektriskt overspenningsskydd
US3983528A (en) Resistor network with adjustable resistance value
EP0307372B1 (de) Elektrischer Hochleistungswiderstand
US2261667A (en) Electrical resistance
US9601243B2 (en) Contact element for varistor
US4689598A (en) Electrical fuse
EP3301695B1 (de) Überbrückungsstreifen und umschaltvorrichtungsanordnung
US3755769A (en) Modularized fuse with precise gap
EP0346263B1 (de) Thermischer Schutz mit variablem Widerstand sowie Verfahren zu dessen Herstellung
US3242271A (en) Electrical switch and improved contact finger and contact clip construction therefor
US4511874A (en) Fatigue-resistant fuse strip
US4017817A (en) Fuse strips
US5796569A (en) Cylindrical PTC circuit overcurrent protection device
USRE25834E (en) Adjustable inductance unit
EP0059334B1 (de) Elektrische Sicherung
JPH0359954A (ja) 組電池装置
US3523265A (en) Fuse elements
EP0203041B1 (de) Widerstandsstruktur für elektrische Leistung
US3256447A (en) Protective fuse having an auxiliary electrode
US3471818A (en) Unitary full-range current-clearing fusible element
US3164797A (en) Wire wound electrical resistor

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19900711

17Q First examination report despatched

Effective date: 19921105

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 3888266

Country of ref document: DE

Date of ref document: 19940414

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: AEG SCHIENENFAHRZEUGE GMBH

Effective date: 19941129

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

R26 Opposition filed (corrected)

Opponent name: AEG SCHIENENFAHRZEUGE GMBH

Effective date: 19941129

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

R26 Opposition filed (corrected)

Opponent name: AEG SCHIENENFAHRZEUGE GMBH

Effective date: 19941129

R26 Opposition filed (corrected)

Opponent name: ABB DAIMLER-BENZ TRANSPORTATION (DEUTSCHLAND) GMB

Effective date: 19941129

PLBO Opposition rejected

Free format text: ORIGINAL CODE: EPIDOS REJO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAE Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOS REFNO

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

R26 Opposition filed (corrected)

Opponent name: ABB DAIMLER-BENZ TRANSPORTATION (DEUTSCHLAND) GMB

Effective date: 19941129

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION REJECTED

27O Opposition rejected

Effective date: 20000108

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070912

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20070808

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070927

Year of fee payment: 20

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20080906

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20080906

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

R26 Opposition filed (corrected)

Opponent name: ABB DAIMLER-BENZ TRANSPORTATION (DEUTSCHLAND) GMBH

Effective date: 19941129