EP0107167B1 - Percuteur à grande sensibilité - Google Patents

Percuteur à grande sensibilité Download PDF

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Publication number
EP0107167B1
EP0107167B1 EP19830110368 EP83110368A EP0107167B1 EP 0107167 B1 EP0107167 B1 EP 0107167B1 EP 19830110368 EP19830110368 EP 19830110368 EP 83110368 A EP83110368 A EP 83110368A EP 0107167 B1 EP0107167 B1 EP 0107167B1
Authority
EP
European Patent Office
Prior art keywords
core
magnetic
casing
spring
force
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
Application number
EP19830110368
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0107167A1 (fr
Inventor
Gérard Ebersohl
Pierre Favier
Claude Becas
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 SA
Original Assignee
Alstom 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 Alstom SA filed Critical Alstom SA
Publication of EP0107167A1 publication Critical patent/EP0107167A1/fr
Application granted granted Critical
Publication of EP0107167B1 publication Critical patent/EP0107167B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • H01H71/321—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements
    • H01H71/322—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements with plunger type armature

Definitions

  • the present invention relates to a striker intended to release mechanical energy under the action of an electrical signal, comprising a cylindrical metal case with a bottom, made of material permeable to magnetic flux, a magnetic core and an electric coil.
  • the document FR-A-1 592 767 describes in particular a striker comprising a large spring maintained bandaged by a movable part under the action of a mechanical energy of low value, this energy being produced by a second movable member having a potential mechanical energy released by the action of an electric current.
  • the second movable member is a metal part compressing a small spring, held by a magnet and released by the action of a current in a coil which creates a magnetic flux opposing that of the magnet.
  • Such a striker has a number of faults.
  • document FR-A-2 412160 which combines the elements of the preamble of the independent claims, is known to have a striker of the type comprising a sliding percussion rod capable of assuming a fixed position in which the rod maintains a band spring, the fixed position of the rod being obtained by magnetic attraction by means of a magnetic circuit with permanent magnet, and an electric coil enabling said attraction to be canceled to allow the spring which drives the rod to be relaxed, the magnetic circuit comprising, on the one hand, two pole pieces threaded on said rod, one fixed in contact with the magnet, the other, moviie, said pole pieces each comprising a shoulder respectively coming into contact with one and the other end of a spring threaded on the rod, and on the other hand, a housing surrounding the pole pieces and having a bottom in contact with the magnet and a cover provided with an orifice through which protrudes the has a rod, the rod having a bulge allowing it to be joined in translation with the moving part, said coil surrounding the pole pieces.
  • the assembly is not very sensitive to corrosion.
  • the specifications assign a very low value to the current which must feed the striker coil during the operation of the striker; however, one must not, always according to the specifications required, multiply the ampere-turns of the coil, under penalty of having to increase the dimension of the latter beyond certain imposed limit values.
  • An object of the present invention is to produce a striker of small volume, releasing a large energy under the action of a low electrical energy.
  • Another object of the invention is to produce a striker with a high degree of insensitivity to shocks, so as not to inadvertently release its energy in the absence of an electrical signal.
  • the striker remains insensitive to any acceleration up to a value of 100 g.
  • the subject of the present invention is a striker intended to release mechanical energy under the action of an electrical signal
  • a cylindrical metal casing with a bottom made of material permeable to magnetic flux, a fixed cylindrical magnetic core coaxial with said casing, a core movable magnetic, a spring and an electric coil
  • said housing has inside an axial cylindrical pillar extending from the bottom over a part of the length of the housing, said coil being arranged coaxially with said pillar and surrounding it
  • said fixed magnetic core placed in the extension of the coil, having an outside diameter smaller than the inside diameter of the case and having at one end a shoulder by which it is in contact with the inside lateral surface of the case
  • said striker comprising a magnet under form of rubber band rolled into a cylinder and placed between the inner surface of the housing and the side surface rale of the fixed core, said spring having the same axis as the coil and the pillar and bearing by a first end on the bottom, said movable core being able to slide in the fixed core and having
  • the invention relates to a striker intended to release mechanical energy under the action of an electrical signal, comprising a cylindrical metal housing with a bottom, made of material permeable to magnetic flux, a magnetic core, a core movable magnetic, a spring and an electric coil, characterized in that said magnetic core, cylindrical and of the same axis as the housing, forms with the latter a single block, said housing comprising inside its an axial cylindrical pillar extending from the melts over part of the length of the housing, said coil being arranged coaxially with said pillar and surrounding it, said striker comprising a magnet in the form of a magnetic rubber band wound in a cylinder and placed between the interior surface of the housing and the lateral surface of the fixed core, said spring having the same axis as the coil and the pillar and bearing at one end on the fixed core, said movable core being able to slide in the fixed core and having a shoulder on which a second end of the spring is supported, the movable core having a planar end coming to bear on the plan
  • It comprises a cylindrical housing 1 provided with a bottom 2 and a central cylindrical pillar 3 starting from the bottom and extending over a length of between 1/3 and half the length of the housing.
  • the housing, its bottom and the pillar are preferably made from a single piece of metal; the metal chosen is preferably a soft iron. A part of the magnetic circuit of low reluctance is thus obtained. If, however, a housing with a crimped bottom is produced, it will be necessary to increase the number of turns of the winding to take account of the additional reluctance due to the air gap. Between the housing and bottom around the pillar are arranged, coaxially, a spring 4, one end 4A of which rests on the bottom 2, and a coil 5, which occupies the entire volume between the spring and the side wall of the housing.
  • the length 1 of the winding and the length 10 of the pillar are chosen so that the difference d of these lengths is between 1/15 and 1/4 of the length 10 so that the underside of the pillar is inside the coil.
  • Supply wires 5A from the coil pass through a bore in the bottom.
  • the magnetic circuit is completed by a fixed core 7, of cylindrical shape having an axial bore.
  • the outside diameter of the core is less than the inside diameter of the case, except at one end or a shoulder 7A comes into contact with the inside wall of the case.
  • the fixed core 7 abuts against a shoulder 1A of the internal wall of the housing at the end of the coil.
  • the thickness of the side wall of the housing is therefore smaller, but constant from the shoulder 1A to its end opposite the bottom.
  • a magnet 8 is arranged in the form of a magnetized rubber band wound in a cylinder.
  • the magnetization of the strip being perpendicular to the surface of the strip, the fact of having it wound in a cylinder determines a radial magnetization.
  • a movable core 9 is placed in the fixed core; it has a shoulder 9A on which the end 4B of the spring 4 bears.
  • This mobile core made of soft magnetic material, has a flat end surface 9B which comes into contact with the end of the pillar 3.
  • the flux created by the magnet passes through the fixed core 7, the moving part 9, the pillar 3, the bottom 2 and closes by the side wall 1 of the housing.
  • the induction crossing the surface 9B produces a bonding force of the core 9 on the pillar; this force is opposed to that of the spring which is banded in the position of FIG. 1.
  • the lines of force of the magnet 8 are partially closed by the shoulder 7A of the core 7 without crossing the surface 9B.
  • the large surface of the magnet with the magnetic circuit makes it possible to work at low levels of induction.
  • the clearances and the surface states in this contact zone are therefore not critical.
  • the surface condition of the faces of the shoulder 7A in contact with the housing so as to decrease the value of the reluctance of the corresponding air gap.
  • the end 9B of the movable core will be carefully ground and possibly nickel-plated, so that the air gap formed with the end surface of the pillar 3 has as low a reluctance as possible.
  • the striker is completed by a percussion rod 11, passing through a cover 13 of the housing made of non-magnetic material.
  • the operation of the device is as follows: in the absence of current in the coil, the movable core 9 and the pillar 3 are in contact, attracted magnetically in the magnetic circuit comprising the magnet 8, the fixed core 7 and the movable core 9 and closing by the bottom 2 and the lateral surface of the housing with a very small air gap 9B.
  • the magnetic contact force is sufficient to keep the spring 4 bandaged.
  • the bonding force becomes lower than that of the spring which relaxes (FIG. 2) and drives by its shoulder 9A, the movable core 9 which itself drives the percussion rod 11.
  • the percussion rod controls the closing devices of the circuit breaker.
  • the mobile core is lightened as much as possible; it can also be separated from the rod 11 as shown in the aforementioned document FR-A-2412160.
  • the first means consists in adjusting the mechanical force of the spring 4 by placing at one of its ends one or more washers of calibrated thickness such as 30.
  • the bonding force of the spring is measured by means of a dynamometer fixed to the movable core. Knowledge of the characteristics of the spring makes it possible to establish an abacus or a table giving the total thickness of washers to be put in place.
  • a means of adjusting the adhesive strength of the movable core 9 consists in gradually driving in the annular magnet 8 before the non-magnetic cover 13 is put in place.
  • the magnet is therefore gradually inserted around the core 7.
  • the tool may include a tube pushing the magnet and operated by a micrometric screw.
  • a dynamometer pulls the core 9.
  • the position of the magnet is thus precisely determined, which gives the desired bonding force.
  • the latter is then immobilized by means of one or more screws 20 passing through the wall 1 through a bore and wedging the magnet on the core.
  • the non-magnetic cover 13, then placed, does not disturb the adjustment.
  • a third way is to adjust the bonding strength by means of additional shunt (see Figures 5 and 6).
  • One or more metallic pieces such as 40 are applied to the lower end of the fixed core. These pieces, made of soft iron, preferably in the form of a circular sector (see FIG. 6) serve as magnetic shunt by reducing the induction created by the magnet in the movable core 9 and reducing the reluctance for the flux created by the coil.
  • the length of the magnet must be such that its lower end does not exceed or better, or slightly behind the inner end of the fixed core.
  • the apparatus may include a second coil, coaxial with the coil 5, for the electrical reset of the striker (not shown in the drawing).
  • Figure 7 shows, in section a striker according to an alternative embodiment.
  • the fixed core 7 and the housing 1 form a single block obtained by any known means.
  • This arrangement makes it possible to overcome the reluctance dispersions between the core 7 and the housing 1.
  • the required reluctance is no longer obtained by the hardly reproducible length of an air gap, but by the choice of the height L which is easy. adjust once and for all for a well-defined induction.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
EP19830110368 1982-10-21 1983-10-18 Percuteur à grande sensibilité Expired EP0107167B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8217607 1982-10-21
FR8217607A FR2535107A1 (fr) 1982-10-21 1982-10-21 Percuteur a grande sensibilite

Publications (2)

Publication Number Publication Date
EP0107167A1 EP0107167A1 (fr) 1984-05-02
EP0107167B1 true EP0107167B1 (fr) 1987-01-21

Family

ID=9278453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830110368 Expired EP0107167B1 (fr) 1982-10-21 1983-10-18 Percuteur à grande sensibilité

Country Status (5)

Country Link
EP (1) EP0107167B1 (ja)
JP (1) JPS59501928A (ja)
DE (1) DE3369422D1 (ja)
FR (1) FR2535107A1 (ja)
WO (1) WO1984001662A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005044230A1 (de) * 2005-09-16 2007-04-05 Abb Patent Gmbh Elektromagnetischer Auslöser

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573570B1 (fr) * 1984-11-22 1988-05-27 Merlin Gerin Relais electromagnetique polarise a accrochage magnetique pour un declencheur d'un disjoncteur electrique
US4876521A (en) * 1987-08-25 1989-10-24 Siemens Energy & Automation, Inc. Tripping coil with flux shifting coil and booster coil
FR2656953B1 (fr) * 1990-01-05 1996-08-30 Merlin Gerin Relais electromagnetique polarise par un aimant permanent.
JP5742133B2 (ja) * 2009-12-18 2015-07-01 富士電機機器制御株式会社 電磁石装置
CN103943428B (zh) * 2014-04-23 2016-08-17 华东交通大学 一种永磁体可移动式中低压断路器驱动装置
US11049635B2 (en) 2016-03-03 2021-06-29 Nachi-Fujikoshi Corp. Solenoid

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919324A (en) * 1958-08-04 1959-12-29 Leach Corp Magnetic shuttle device
US3783423A (en) * 1973-01-30 1974-01-01 Westinghouse Electric Corp Circuit breaker with improved flux transfer magnetic actuator
FR2240518A1 (en) * 1973-08-07 1975-03-07 Electricite De France Percussion trigger device for circuit breaker - release device reduces the attraction of a permanent magnet
FR2412160A1 (fr) * 1977-12-19 1979-07-13 Alsthom Cgee Dispositif electromecanique de percussion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005044230A1 (de) * 2005-09-16 2007-04-05 Abb Patent Gmbh Elektromagnetischer Auslöser
DE102005044230B4 (de) * 2005-09-16 2008-04-10 Abb Patent Gmbh Elektromagnetischer Auslöser

Also Published As

Publication number Publication date
JPS59501928A (ja) 1984-11-15
WO1984001662A1 (fr) 1984-04-26
FR2535107B1 (ja) 1985-04-12
DE3369422D1 (en) 1987-02-26
JPH0329166B2 (ja) 1991-04-23
EP0107167A1 (fr) 1984-05-02
FR2535107A1 (fr) 1984-04-27

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