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WO2018141567A1 - Résistance de puissance ondulée - Google Patents

Résistance de puissance ondulée Download PDF

Info

Publication number
WO2018141567A1
WO2018141567A1 PCT/EP2018/051447 EP2018051447W WO2018141567A1 WO 2018141567 A1 WO2018141567 A1 WO 2018141567A1 EP 2018051447 W EP2018051447 W EP 2018051447W WO 2018141567 A1 WO2018141567 A1 WO 2018141567A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical conductor
base body
power resistor
axis
resistor according
Prior art date
Application number
PCT/EP2018/051447
Other languages
German (de)
English (en)
Inventor
Severa MICHAL
Peter Martin
Original Assignee
Vishay Electronic Gmbh
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
Application filed by Vishay Electronic Gmbh filed Critical Vishay Electronic Gmbh
Publication of WO2018141567A1 publication Critical patent/WO2018141567A1/fr

Links

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
    • 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
    • H01C3/14—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element being formed in two or more coils or loops continuously wound as a spiral, helical or toroidal winding
    • H01C3/18—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element being formed in two or more coils or loops continuously wound as a spiral, helical or toroidal winding wound on a flat or ribbon base

Definitions

  • the present invention relates to a power resistor having a principal axis having a main body, which carries at least one electrical conductor.
  • the electrical conductor is repeatedly wound as tightly as possible around the base body, which is intended to prevent slippage of individual winding loops, in order to reliably avoid touching the winding loops and a short circuit connected thereto.
  • power resistors are known in principle and are used for example as filter or damping resistors of electrical resonant circuits or are used in electrical generators or frequency converters to rapidly reduce high electrical power.
  • substantially electrical energy is converted by the power resistor into thermal energy. Since the thermal expansion coefficients of the main body and the electrical conductor are usually different, the heat generated causes the base body and the electrical conductor to expand to different extents. If, for example, the main body has a greater thermal expansion than the electrical conductor, high mechanical stresses can build up as a result of the tight winding of the electrical conductor, so that in the extreme case the
  • An object of the invention is therefore to provide an improved power resistor in which the problems described above do not occur even at high heat input.
  • a power resistor with the features of claim 1 is provided.
  • the power resistor according to the invention comprises a main body having a main extension axis, which carries at least one electrical conductor.
  • the electrical conductor is wound on the base body.
  • the electrical conductor is at least partially configured both band-like and undulated in its longitudinal extent.
  • the invention is based on the general idea that the electrical conductor can be stretched by an at least partial undulation of the electrical conductor during thermal expansion, in particular during thermal expansion of the base body. This increases a wavelength of undulation. That The electrical conductor can follow better by a change in length, which is made possible by the undulation, a strong thermal expansion of the body. In addition, the surface-to-volume ratio is significantly improved by the band-like design of the electrical conductor, which favors a higher heat dissipation. This results in the advantage that heat-related expansion damage can be avoided, thereby increasing the life of the power resistor in total.
  • the electrical conductor can have different types of undulations, for example, the undulation may be sinusoidal, zig-zag-like (triangular and / or triangulation), sawtooth-like, rectangular, or any other type of undulation. It is irrelevant whether the undulation is periodic, partially periodic or completely aperiodic. Moreover, the amplitude of the undulation of the be even electrical conductor. However, it is also conceivable that the electrical conductor has sections with different undulation amplitude. Also, the undulation of the electrical conductor can have a constant wavelength. Undulation sections with different wavelengths are also possible. It is understood that even sections without undulation can be present. For example, the electrical conductor may not be undulated in its two end regions for better contacting of the electrical conductor.
  • the electrical conductor can have a constant cross-sectional shape and / or cross-sectional area when viewed in the direction of its longitudinal extent. In principle, it is also possible that the cross-sectional shape and / or cross-sectional area vary. Furthermore, the electrical conductor may comprise different materials at least in sections. In particular, the different materials may be periodically arranged in the longitudinal extension and / or have different thermal expansion coefficients.
  • the power resistor may not only comprise an electrical conductor which is wound around the base body, but also several conductors may be polyfilarly wound around the base body.
  • the base body and the at least one wound around the main body electrical conductor in a housing, in particular a cylindrical housing, arranged, which is filled with an electrically non-conductive granules, such as sand.
  • a housing in particular a cylindrical housing, arranged, which is filled with an electrically non-conductive granules, such as sand.
  • a particularly favorable design of the power resistor can be realized if the electrical conductor spirally with at least one winding wound around a winding axis on the base body.
  • the winding axis and the extension axis of the base body are aligned substantially parallel to each other.
  • the winding axis and the extension axis at an angle, in particular an acute angle may be aligned with each other.
  • the electrical conductor has a cross section with a first axis defining a width of the electrical conductor and with a second axis defining a thickness of the electrical conductor.
  • the cross section of the electrical conductor is rectangular, wherein the edges of the electrical conductor can also be rounded.
  • the first axis of the electrical conductor and the main extension axis of the base body are aligned substantially parallel to one another.
  • the band-like electrical conductor is not with its narrow side on the body.
  • a zig-zag-like undulation of the band-like electrical conductor is comparable to a Leporellofalz, wherein the folds are aligned substantially parallel to the winding axis or to the main axis of extension of the body.
  • the electrical conductor may have an undulation with only one extreme point facing the base body and only one extreme point facing away from the base body.
  • the undulation of the electrical conductor preferably has a plurality of extreme points, wherein a part of the extreme points faces the base body and the other part of the extreme points faces away from the base body.
  • the extreme points in relation to the winding axis partially radially inward and partially radially outward.
  • the main body may have various peripheral shapes.
  • the peripheral shape of the body is rectangular, but also a circular peripheral shape or any undefined circumferential shape are conceivable.
  • a substantially planar support element is provided.
  • the main body can also comprise a plurality of planar support elements which are aligned with one another in such a way that the basic body has, for example, a T-shaped, Y-shaped, cross-shaped or star-shaped cross section. But it is also conceivable that the main body has an O-shaped, round, oval or any other cross section.
  • the main body may have notches in which the winding loops are received at least in sections.
  • the base body has at least one edge, in particular a substantially straight edge, against which the electrical conductor rests.
  • the edge is substantially parallel to the main axis of extension of the main body.
  • the electrical conductor is positively and / or non-positively attached to the edge of the body.
  • the electrical conductor is pressed in this embodiment, so to speak, at the edge of the body or even clamped.
  • slippage of the conductor can be prevented, so that adjacent winding loops do not come into contact and ultimately a short circuit between them is avoided.
  • the production of the base body is simplified, as can be dispensed with costly indentations of the edges of the body.
  • at least one fastening element is provided on the base body, which serves for fastening, in particular for material-locking fastening, for example by welding or soldering, the electrical conductor seen on the base body. It is advantageous if the fastening element is arranged in a region near the edge and / or in an axial end region of the base body.
  • the fastening element is designed in the form of a rivet, which is riveted to the base body.
  • each locking head of the rivet a mounting surface for cohesively securing the electrical conductor.
  • the rivet can be used to festzunieten the electrical conductor to the body in a conventional manner.
  • the base body comprises an electrically insulating material, such as mica, in particular mica, hard paper, ceramic or an electrically non-conductive plastic.
  • an electrically insulating material such as mica, in particular mica, hard paper, ceramic or an electrically non-conductive plastic.
  • the electrical conductor preferably consists of a metallic material, wherein in principle the use of an electrically conductive plastic is conceivable.
  • FIG. 1 is a perspective plan view of a power resistor according to the invention according to a first embodiment
  • Fig. 2 is a cross-sectional view of the power resistor of Fig. 1; 3 shows an alternative manner of fastening an electrical conductor of a power resistor according to the invention; and FIG. 4 shows a further possible embodiment of a power resistor according to the invention.
  • FIG. 1 and 2 show a power resistor according to the invention with a main body 10 having a main extension axis A, around which a band-like electrical conductor 12 is spirally wound around a winding axis B.
  • the main body 10 comprises an electrically insulating material, such as mica, in particular mica, hard paper, ceramic or an electrically non-conductive plastic, whereas the electrical conductor 12 may be, for example, a metal or an electrically conductive plastic.
  • the main body 10 is in the embodiment shown by way of example a substantially planar support element for the electrical conductor 12.
  • the main extension axis A of the main body 10 and the winding axis B are slightly inclined relative to each other and form an acute angle (FIG. 1).
  • the main extension axis A of the main body 10 and the winding axis B practically coincide.
  • the electrical conductor 12 has a substantially rectangular cross-section with a first axis defining a width of the electrical conductor 12 and with a second axis defining a thickness of the electrical conductor 12, the thickness of the electrical conductor 12 being significantly less than its width ,
  • the first axis and the main extension axis A of the main body 10 are aligned substantially parallel to one another, ie the electrical Head 12 is not wound with its narrow side, but rather with its broad side on the base body 10.
  • the electrical conductor 12 is undulated in its longitudinal extent.
  • the undulation of the electrical conductor 12 serves to compensate for any thermal expansion of the main body 10, which may occur, for example, during the operation of the power resistor.
  • the undulation of the electrical conductor 12 has a plurality of extreme points 14, wherein a part of the extreme points 14a face the main body 10 and the other part of the extreme rems kind 14b facing away from the base body 10.
  • the extreme points 14 can touch the base body 10 (FIG. 2), but also can not be in contact with it (FIG. 3).
  • the electrical conductor 12 is zig-zag-shaped in its longitudinal extension.
  • the undulation of the electrical conductor 12 is formed to a certain extent in the form of a Leporellofalzes, wherein the individual folds of the Leporellofalzes represent the extreme points 14 of the undulation.
  • the folds extend over the entire width of the electrical conductor 12 and are aligned substantially parallel to the main extension axis A of the main body 10 or to the winding axis B.
  • the electrical conductor 12 may also be differently undulated, for example sinusoidal, sawtooth, rectangular or in any other way.
  • the electrical conductor 12 may also be only partially undulated.
  • the properties of the undulation (in particular their shape, amplitude, wavelength) can vary in the longitudinal extent of the electrical conductor 12.
  • the main body 10 further has at least one substantially straight and substantially to the main extension axis A of the main body parallel edge 16, on which the wound around the main body 10 electrical conductor 12th is applied.
  • the base body 10 specifically comprises two mutually substantially parallel edges 16, against which the electrical conductor 12 rests.
  • the electrical conductor 12 abuts with an extreme point 14 on the edge 16.
  • the electrical conductor 12 may be positively and / or non-positively attached to the base 16 for better attachment to the base body 10, so that thereby a slippage of individual winding loops of the electrical conductor 12 can be avoided.
  • the fastening element 18 is used in particular for materially bonded fastening, for example by welding or soldering, of the electrical conductor 12 to the base body 10.
  • the fastening element 18 comprises a head 20, in particular a setting head of the rivet, which serves as a mounting surface for the electrical conductor 12 serves.
  • the electrical conductor 12 is shown in Fig. 3 as if it were attached only on one side of the body, it is understood that the electrical conductor 12 may also be wound around the base body 10 as well.
  • the electrical conductor 12 may be attached to the base body 10 on a side of the base body 10 opposite the setting head on a closing head (not shown) formed during the riveting process.
  • FIG. 4 shows a further embodiment of a power resistor, which essentially differs from the power resistor illustrated in FIGS. 1 and 2 in that the base body 10 is formed from two support elements 22 oriented perpendicular to one another.
  • the support elements 22 can bei- For example, along the main axis of extension A of the base body 10 be positively and / or non-positively inserted into one another.
  • the two support elements 22 may also be cohesively connected to one another, for example by means of adhesive, in order to form the main body 10.
  • the main body 10 shown in FIG. 4 has a substantially cross-section or X-shaped cross section. But it is also conceivable that the base body 10 may have other cross-sectional shapes, such as a T-shape, Y-shape or star-like shape. Moreover, the main body 10 may have an O-shaped, round, oval or any cross section.
  • the electrical conductor 12 can follow the thermal expansion of the main body 10 or compensate for a heat-related volumetric expansion of the main body 10 by a change in length, without the electrical conductor 12 tearing, which ultimately ensures long-term operational reliability of the power resistor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Resistors (AREA)

Abstract

La présente invention concerne une résistance de puissance ayant un corps de base (10) présentant un axe d'extension principal (A) et supportant au moins un conducteur électrique (12). Le conducteur électrique (12) est en particulier enroulé sur le corps de base (10) et le conducteur électrique (12) est conçu au moins par secteurs sous forme d'un ruban et est ondulé au moins par secteurs dans une direction longitudinale du conducteur électrique.
PCT/EP2018/051447 2017-02-02 2018-01-22 Résistance de puissance ondulée WO2018141567A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017102019.5 2017-02-02
DE102017102019.5A DE102017102019A1 (de) 2017-02-02 2017-02-02 Leistungswiderstand

Publications (1)

Publication Number Publication Date
WO2018141567A1 true WO2018141567A1 (fr) 2018-08-09

Family

ID=61022352

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/051447 WO2018141567A1 (fr) 2017-02-02 2018-01-22 Résistance de puissance ondulée

Country Status (3)

Country Link
DE (1) DE102017102019A1 (fr)
TW (1) TW201841173A (fr)
WO (1) WO2018141567A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1373689A (en) * 1921-04-05 Resistance device
FR678076A (fr) * 1929-07-09 1930-03-18 Résistance électrique
FR37204E (fr) * 1929-07-10 1930-11-03 Résistance électrique
FR697913A (fr) * 1929-11-11 1931-01-23 Brown élément de résistance électrique à ruban métallique
GB367004A (en) * 1930-02-19 1932-02-05 Edwin Niblock Lightfoot Improvements in electrical resistance devices
US4100395A (en) * 1976-06-29 1978-07-11 Glenro, Inc. Expanded element radiant heating device
FR2397705A1 (fr) * 1977-07-11 1979-02-09 Siemens Ag Element de resistance en forme de bande
US4359710A (en) * 1980-02-11 1982-11-16 Eaton Corporation Annular resistor with zig-zag layer pattern for resistance elements
EP1884962A1 (fr) * 2006-08-04 2008-02-06 Gamma S.P.A. Résistance électrique pour un dispositif de chauffage
GB2472784A (en) * 2009-08-17 2011-02-23 Tyco Electronics Ltd Uk resistor and method of manufacture
CN102436882B (zh) * 2011-06-16 2013-08-28 王爱民 一种波浪式电阻片的电阻器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE876875C (de) 1951-08-17 1953-05-18 Heraeus Gmbh W C Elektrisches Widerstandsheizelement
DE3337420A1 (de) 1983-10-14 1985-04-25 Draloric Electronic GmbH, 8672 Selb Elektrischer hochlast-drahtwiderstand
DE4225724C2 (de) 1992-01-25 1998-04-16 Abb Patent Gmbh Leistungswiderstand für Flüssigkeitskühlung

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1373689A (en) * 1921-04-05 Resistance device
FR678076A (fr) * 1929-07-09 1930-03-18 Résistance électrique
FR37204E (fr) * 1929-07-10 1930-11-03 Résistance électrique
FR697913A (fr) * 1929-11-11 1931-01-23 Brown élément de résistance électrique à ruban métallique
GB367004A (en) * 1930-02-19 1932-02-05 Edwin Niblock Lightfoot Improvements in electrical resistance devices
US4100395A (en) * 1976-06-29 1978-07-11 Glenro, Inc. Expanded element radiant heating device
FR2397705A1 (fr) * 1977-07-11 1979-02-09 Siemens Ag Element de resistance en forme de bande
US4359710A (en) * 1980-02-11 1982-11-16 Eaton Corporation Annular resistor with zig-zag layer pattern for resistance elements
EP1884962A1 (fr) * 2006-08-04 2008-02-06 Gamma S.P.A. Résistance électrique pour un dispositif de chauffage
GB2472784A (en) * 2009-08-17 2011-02-23 Tyco Electronics Ltd Uk resistor and method of manufacture
CN102436882B (zh) * 2011-06-16 2013-08-28 王爱民 一种波浪式电阻片的电阻器

Also Published As

Publication number Publication date
DE102017102019A1 (de) 2018-08-02
TW201841173A (zh) 2018-11-16

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