EP0622813B1 - Widerstandselement für Leistungswiderstand - Google Patents

Widerstandselement für Leistungswiderstand Download PDF

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Publication number
EP0622813B1
EP0622813B1 EP94400913A EP94400913A EP0622813B1 EP 0622813 B1 EP0622813 B1 EP 0622813B1 EP 94400913 A EP94400913 A EP 94400913A EP 94400913 A EP94400913 A EP 94400913A EP 0622813 B1 EP0622813 B1 EP 0622813B1
Authority
EP
European Patent Office
Prior art keywords
slots
resistive element
series
strip
resistive
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.)
Expired - Lifetime
Application number
EP94400913A
Other languages
English (en)
French (fr)
Other versions
EP0622813A1 (de
Inventor
Olivier Couderc
Bernard Puel
Joseph Teixido
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.)
Alstom Transport SA
Original Assignee
GEC Alsthom Transport SA
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 GEC Alsthom Transport SA filed Critical GEC Alsthom Transport SA
Publication of EP0622813A1 publication Critical patent/EP0622813A1/de
Application granted granted Critical
Publication of EP0622813B1 publication Critical patent/EP0622813B1/de
Anticipated expiration legal-status Critical
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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 present invention relates to a resistive element for power resistance.
  • Some power resistors use metallic strips or plates as a resistive part. This is the case in particular of the power resistors used in rail traction as a braking rheostat. To limit overheating and wear on mechanical brakes, a significant part of the kinetic energy of the machine is converted into electrical energy dissipated in thermal form in power rheostats. These resistors must withstand the severe service conditions encountered in rail traction. These rheostats are in the form of boxes which are combined to obtain the desired total resistance. Each box has a resistive part generally made from an alloy of nickel and chromium. The resistive part can be constituted in different ways, for example by strips folded in a zigzag and welded end to end or by plates connected in series.
  • the resistive part of the power resistor can consist of a dimensioned ribbon, from the manufacturing, in width, thickness and length.
  • the resistivity is defined during casting, the rolling determines its thickness, the cutting its width and the flow its length.
  • This method has several drawbacks.
  • the supply time is long (four or five months) since the interventions take place from the metal casting.
  • the manufacturing cost is high since the parts are made on demand.
  • resistive plates sold by the French company RESISTEL S.A. which have slots always perpendicular to the length of the plates (see Figure 1).
  • the resistance value is a function of the pitch imposed on the transverse slots. This solution turns out to be much more satisfactory than the previous ones: there is no local alteration in resistance, the slits being able to be made without roughing up the metal.
  • the pitch of the slots allowing the resistance to be adjusted, the variations in thickness and resistivity of plates of different origins can thus be compensated.
  • DE-C-420027 teaches the arrangement of slots (internal, external or mixed) in the form of I perpendicular to the edges or in the form of U, X or double-T to increase the electrical resistivity and the mechanical resistance.
  • DE-C-486243 describes a resistive element in cast iron subdivided into several meander-shaped bands connected in parallel.
  • GB-A-196 480 relates to a resistive element in accordance with the preamble of claim 1.
  • a resistive element is proposed, in the form of a plate or ribbon, several of which can be combined to constitute a power resistance, this resistive element having slots inclined at a determined angle.
  • the angle of inclination of the slots and the pitch of these slots makes it possible to finely adjust the value of the resistance of the resistive element (up to a hundredth of an ohm).
  • the resistive element by comprising several electrical circuits joined in parallel by the ends, has the advantage of imparting great flexibility in adjusting the resistance. In this case, one can act on the pitch of the slots, their angle of inclination and the number of electrical circuits.
  • the strip can advantageously form a plate.
  • An additional slot may advantageously be provided between the end of an electrical circuit and the corresponding end of the resistive element if this end of the electrical circuit is between an internal slot and one of said edges of the strip.
  • the resistive element can comprise in series several electrical circuits in parallel.
  • FIG. 1 represents, seen from above, a resistive plate according to the known art.
  • the rectangular plate 1 in alloy of nickel and chromium, has two opposite ends 2 and 3 by which the plate will be fixed in a rheostat comprising a plurality of identical plates. These ends 2 and 3 also serve as electrical connections for placing the various resistive plates of the rheostat in series according to a method well known to those skilled in the art. Holes 4 and 5 drilled in the middle position in the ends 2 and 3 can ensure both the mechanical maintenance of the plates and their placing in series.
  • Slots are made in the plate from the edges 6 and 7 joining the ends 2 and 3: slots 8 made from the edge 6 and slots 9 made from the edge 7.
  • the slots 8 and 9 are located alternately so as to form a zigzag electrical circuit between the ends 2 and 3.
  • the slots 8 and 9 are perpendicular to the edges 6 and 7 of the resistive plate 1 and are therefore perpendicular to an axis passing through the holes 4 and 5.
  • the value of the resistance of the plate 1 is adjusted by adjusting the pitch of the regularly spaced slots 8 and 9. Since the plate has a plurality of slots, it is difficult from a single variable to precisely adjust the value of its resistance. This difficulty increases with the number of slots.
  • Figure 2 is a top view of a resistive plate 10 according to an embodiment of the invention. It is a rectangular plate, for example made of nickel-chrome, which has two opposite ends 11 and 12. Holes 13 and 14 drilled in these ends serve for the mechanical fixing of the plate 10 as well as for its electrical connection. An additional hole 15 in the central part ensures intermediate mechanical support of the same type as for the ends.
  • the edges 16 and 17 of the plate 10 join the ends 11 and 12. From the edge 16, slots were made 18. From the edge 17, slots were made 19.
  • the interior of the plate 10 has a series of slots 20 in its upper part, according to the view in FIG. 2. It also has a series of slots 21 in its lower part.
  • the slots delimit three electrical circuits in parallel on the left side of the plate and three electrical circuits in parallel on the right side. One of these circuits is shown in dotted lines.
  • the plate 10 therefore comprises in series two assemblies each comprising three electrical circuits in parallel.
  • the internal slots 20 and 21 are all the same length and the slots 18 and 19 of the plate edges are half length.
  • the pitch between two successive slots is the same for the entire plate and the angle of inclination is of course always the same.
  • the slots 18, 19, 20 and 21 are inclined at the same angle ⁇ relative to the longitudinal axis of the plate.
  • the resistance of the plate depends on its own characteristics (resistivity, dimensions), the number of its electrical circuits, the pitch of the slots and also the angle of inclination of these slots.
  • FIG. 3 shows the range of development of the resistance R of the plate 10 as a function of the angle of inclination ⁇ for values between 45 and 80 ° and as a function of the dimensions of the plate, the pitch of the slots and the number of electrical circuits.
  • the ordinate axis is graduated in relative values. For the upper curve delimiting the range, it can be seen that for angle values approaching 45 °, the variation in resistance is small. For values approaching 80 °, the resistance variation is significant.
  • the range between 60 and 70 ° is interesting because it allows good control of the resistance variation as a function of the angle of inclination.
  • the slots are inclined by about 66 °.
  • the remedy for avoiding the appearance of excessively hot zones consists in providing an additional slit between the end of the electrical circuit in question and the corresponding end of the resistive element. This is shown in Figure 4 where there is shown a resistive plate 25, of the type of Figure 2, but having these additional slots referenced 26, of the same pitch and the same width as the others.
  • the slits can be made by grooving with a numerically controlled machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Resistors (AREA)
  • Networks Using Active Elements (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Non-Adjustable Resistors (AREA)

Claims (4)

  1. Widerstandselement, das aus einem Band aus Widerstandsmaterial besteht, in dem gemäß einem bestimmten Abstand Schlitze (18, 19, 20, 21) ausgebildet sind, die mindestens einen zickzackförmigen Stromweg zwischen zwei Enden (11, 12) des Widerstandselements begrenzen, die als elektrische Anschlüsse dienen, wobei die Schlitze in Bezug auf eine Achse, die durch die elektrischen Anschlüsse verläuft, um einen Winkel (θ) mit einem bestimmten Wert geneigt sind, um dem Widerstandselement den gewünschten elektrischen Widerstand zu verleihen, wobei das Widerstandselement aufweist:
    - eine erste Längsreihe von Schlitzen (18), die sich vom ersten Rand (16) des Bands (10) ausgehend erstrecken,
    - eine zweite Längsreihe von Schlitzen (19), die sich vom entgegengesetzten Rand (17) des Bands (10) ausgehend erstrecken,
    dadurch gekennzeichnet, daß das Widerstandselement weiter aufweist:
    - mindestens eine Längsreihe von Schlitzen (20, 21), die sich im Inneren des Bandes (10) erstrecken, so daß sich Querreihen von Schlitzen ergeben, die je aus einem Schlitz jeder der Längsreihen bestehen, wobei die Schlitze der Querreihen nebeneinander angeordnet sind, um mindestens zwei parallelgeschaltete elektrische Stromwege zu begrenzen.
  2. Widerstandselement nach Anspruch 1, dadurch gekennzeichnet, daß das Band eine Platte (10, 25) bildet.
  3. Widerstandselement nach einem beliebigen der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß ein zusätzlicher Schlitz (26) zwischen dem Ende eines elektrischen Stromwegs und dem entsprechenden Ende des Widerstandselements vorgesehen ist, wenn dieses Ende des elektrischen Stromwegs zwischen einem Innenschlitz und einem der Ränder des Bandes liegt.
  4. Widerstandselement nach Anspruch 3, dadurch gekennzeichnet, daß es in Reihe mehrere parallelgeschaltete elektrische Stromwege aufweist.
EP94400913A 1993-04-30 1994-04-27 Widerstandselement für Leistungswiderstand Expired - Lifetime EP0622813B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305166 1993-04-30
FR9305166A FR2704683B1 (fr) 1993-04-30 1993-04-30 Elément résistif pour résistance de puissance.

Publications (2)

Publication Number Publication Date
EP0622813A1 EP0622813A1 (de) 1994-11-02
EP0622813B1 true EP0622813B1 (de) 1997-07-09

Family

ID=9446635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400913A Expired - Lifetime EP0622813B1 (de) 1993-04-30 1994-04-27 Widerstandselement für Leistungswiderstand

Country Status (6)

Country Link
EP (1) EP0622813B1 (de)
KR (1) KR100297480B1 (de)
AT (1) ATE155278T1 (de)
DE (1) DE69404078T2 (de)
ES (1) ES2103549T3 (de)
FR (1) FR2704683B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11901850B2 (en) 2019-12-18 2024-02-13 Milwaukee Electric Tool Corporation Power tool having stamped brake resistor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100979141B1 (ko) 2008-05-27 2010-08-31 주식회사 푸름 크레인용 제동저항기
KR100971463B1 (ko) 2008-06-02 2010-07-22 주식회사 푸름 철도 차량용 제동저항기
GB2468677A (en) * 2009-03-17 2010-09-22 Eltek Valere As Resistor device
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE420027C (de) * 1925-10-15 Hans Oberlaender Elektrisches Widerstandselement
DE486243C (de) * 1929-11-14 Aeg Elektrischer Widerstand aus Gusseisen
GB196480A (en) * 1922-05-01 1923-04-26 Robert Frederick Baerlocher Improvements in electrical resistance grids

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11901850B2 (en) 2019-12-18 2024-02-13 Milwaukee Electric Tool Corporation Power tool having stamped brake resistor

Also Published As

Publication number Publication date
ES2103549T3 (es) 1997-09-16
FR2704683B1 (fr) 1995-06-02
KR100297480B1 (ko) 2001-10-24
DE69404078D1 (de) 1997-08-14
FR2704683A1 (fr) 1994-11-04
EP0622813A1 (de) 1994-11-02
ATE155278T1 (de) 1997-07-15
DE69404078T2 (de) 1997-10-30

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