US3708769A - Electromagnetic contactor - Google Patents

Electromagnetic contactor Download PDF

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Publication number
US3708769A
US3708769A US00160438A US3708769DA US3708769A US 3708769 A US3708769 A US 3708769A US 00160438 A US00160438 A US 00160438A US 3708769D A US3708769D A US 3708769DA US 3708769 A US3708769 A US 3708769A
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United States
Prior art keywords
core portion
contactor
driving coil
guide members
core
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Expired - Lifetime
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US00160438A
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English (en)
Inventor
A Caltabiano
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GHISALBA SpA
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GHISALBA SpA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
    • H01H50/22—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil wherein the magnetic circuit is substantially closed

Definitions

  • ABSTRACT An electromagnetic contactor with a magnetic core 30 F0 n A cat- Prio D ta subdivided into two portions, wherein the first of said 1 relg W n y a portions is mounted fixedly with respect to the opera- Oct 22, 1970 Italy.........................................705l4 rive losure stroke of the contactor, but with no positive connection to the contactor structure so as to /2 move back under impact of the second core portion at [51] Int. ....H0111 50/18 the time of contactor closure.
  • Said first core portion [58] Field of may be manually lifted for disengaging and removing the driving coil of the contactor.
  • This invention has the object of improving an elec tromagnetic" contactor by introducing therein a peculiarity suitable by itself for reducing in a substantial 'manner all the above stated disadvantages of different kinds of the known contactors, even by improving the closure power and without in any way increasing the manufacture costs.
  • the movable portion returns'towards the normal closure position, without having caused any violent impact, noise or vibration. Both the core wear and the tendency to contact bounce are therefore substantially reduced. Furthermore, when the movable core portion effects the said additional stroke, it being connected as known to the driven unit of movable contacts, it loades beyond the normal value the springs of the movable contacts and thus it pushes said movable contacts against the fixed contacts, during a brief lapse of time after contactor closure, with an increased load. On one hand said increased load further reduces the bounce tendency, and on the other hand it gives rise to an unusual adherence between the contacts during the peak of maximum current absorption which immediately follows the contactor closure, thus increasing the closure power of the contactor, if all other features remain unchanged.
  • FIG. 1 shows a vertical section'of the contactor, I taken along the displacement direction of the movable contact unit and according to the broken line I-I of FIG. 2;
  • FIG. 2 is a rear'view of a section of th'econtactor, taken along the line II-II of FIG. Ii
  • FIG. 4 is a partial front view showing the respective positions of the coils and themovable contacts.
  • DETAILED DESCRIPTION members 4 are carried, under action of springs 5, by a movable unit 6 which passes through openings 7 of the intermediate wall 1 and which is pin connected, at the rear end thereof, to square levers 8.
  • Said square levers 8 are hinged to pivots 9 fixed to the contactor structure 0, and at the opposite ends they are connected to the movable portion 10 of the magnetic core.
  • Said movable portion 10 faces the socalled fixed portion 11 (which however, as already explained, may be considered fixed only with reference to the main operation stroke).
  • the driving coils 12, which in the example are in number of two, are linked to the branches of the fixed and movable portions 11 and 10 of the magnetic core.
  • the fixed portion 11 of the magnetic core is fixed, stiffly or through shock-absorbing members of a somewhat yieldable material, to the contactor structure 0.
  • the socalled fixed portion 11 of the magnetic core has no fixed connection to the contactor structure, but it is guided with respect to said structure so that it may move in the same direction of displacement as the movable portion 10 of the magnetic core, along a sufficiently long stroke, but only in the direction of departing from said movable portion 10 and not in the direction of approaching it from the rest position.
  • said guide members 15 limit the mobility of the socalled fixed portion 11 such as to establish a rest position thereof. Said fixed portion 11 is maintained in its rest position by its own weight or, if needed, by action or with the aid of light return springs, not shown.
  • the extensions 14 engage the guide members 15 by means of pads 16 of a shock-absorbing or somewhat yieldable material, such as rubber, nylon or the like.
  • the contactor operation takes place as follows.
  • a magnetic flux is produced in the magnetic circuit comprising the movable and fixed portions 10 and 11 of the magnetic core, and as a consequence an attraction force is applied onto the fixed core portion 11, in the direction downwards according to the drawing, as well as onto the movable core por tion 10, in the direction upwards according to the drawing.
  • the extensions 14 rest through the pads 16 upon the transverse portion of the guide members 7 15, the fixed core portion 11 may not move under action of said attraction force which trends to approach said fixed portion 11 to the movable portion 10.
  • the fixed core portion 11 behaves in the same manner as in the known contactors, wherein it is fixedly connected to the contactor structure.
  • the movable core portion 10 is displaced upwards (according to the drawing) by said attraction force and, in a well known manner, it causes the square levers 8 to rotate about the pivots 9 and the movable unit 6 to displace (towards the left hand side, according to the drawing) thus approaching the movable contact members 4 to the fixed contact members 3 up to contact thereof, and then compressing the springs S of the movable contact members 4.
  • the movable core portion 10 When the movable core portion 10 takes contact with the fixed core portion 11, it has at this time a somewhat reduced speed due to the absorption of a portion of the kinetic energy by action of the compression springs 5, however the speed of said movable core portion still is noticeable.
  • the impact against the so-called fixed core portion 11 does not stop the movable core portion 10, thus dissipating its kinetic energy into vibrations, noise and heat produced by anelastic deformations of the materials, as in the known contactors the socalled fixed portion 11 of the core moves back, joined with the movable core portion 10, thus allowing the latter to travel along an additional stroke beyond its normal closure position.
  • the contact springs 5 are further compressed, and so the return springs of, the movable unit 6, if they are provided as required in some contactor types, but not shown in the example. Compression of said springs exhausts the whole kinetic energy of the movable core portion 10. Thereafter, under return action of the compressed springs, the movable unit 6, the movable core portion 10 and the socalled fixed core portion 11 return towards the normal closure position and stop when the extensions 14 of the socalled fixed core portion 11 rest anew upon the transverse portion of the guide members 15. At this time the somewhat yieldable pads 16 absorbe the light shock which is produced.
  • the displacement stroke allowed to the fixed core portion may amount to only few millimeters, for example ten millimeters.
  • the stop 17 is arranged as such a distance a from the fixed core portion, as to allow a displacement amounting at least to the difference between the height L of the coil 12 and the length T of the air gap provided in the magnetic core circuit, in open position.
  • the coil or coils l2 driving the contactor are arranged within suitable windows 71' of the intermediate wall 1; they are fixed in front of said wall, at 18, 19 and are arranged (as shown in FIG. 4) in the free spaces between the movable contact members 4 of the contactor. If said requirements are fulfilled, it is sufficient to release the connections 18, 19 and to raise the fixed core portion 11 up to against the stop 17 for allowing removal of the coils 12 from the front side of the contactor, by passing them between the movable contact members 4 as diagrammatically shown in FIG. 3.
  • Dismounting the coils requires the simple removal of the firescreen or cover 2 with the affixed arc-extinguishing plates 13, without requiring dismounting of any other component part of the contactor, even if it is installed. Since the operation is effected entirely from the front side, it founds no hindrance in other appliances which may be installed in the vicinity. As a consequence dismounting the coils is extremely easy, thus affording the already stated advantages.
  • the movable core portion is slightly engaged within'the coils 12-, and therefore said coils should be slightly raised for disengaging them from the magnetic core when they have to be removed. It is possible, however,
  • the electric connection of the coils 12 may take place, in a manner per se known, by means of their own mechanic connection, thus making'the operation still easier.
  • Raising the fixed core portion may be effected by acting from the front side of the contactor by means of a'screw-driver or like suitable tool, and by operating onto a suitable extension 20 of the fixed core portion 11.
  • Return of the fixed core portion 11 to its normal position may be effected by its own weight or by a return spring (not shown) which, however, should apply a sufficiently light effort such as not to hinder manual raising of the fixed core portion nor its going back at the time of impact against it of the movable core portion 10.
  • the characteristic feature according to the invention is actually suitable for attaining the desired advantages yet without involving an increased cost or a complication in the manufacture of the concerned contactor, so that its application involves a considerable technical and industrial advantage.
  • An electromagnetic.contactor comprising a structure, mounted in said structure at least one driving coil, a first magnetic core portion mounted in said structure for movement in a stroke direction and magnetically linked with said driving coil, a movable unit guided in said structure and operatively connected to said first core portion, movable contact members carried by said movable unit, fixed contact members mounted on said structure and cooperable with said movable contact members, a second magnetic core portion linked with said driving coil and cooperable with said first core portion, and guide members interposed between said structure and said second core portion and supporting said second core portion in a rest position, said guide members guiding said second core portion along a direction of movement corresponding to said stroke direction of said first core portion and allowing free displacement without noticeable resistance of said second core portion from said rest position thereof only in the direction of departing from said first core portion, whereby upon feeding of said coil the first core portion moves towards thesecond core portion by driving said movable unit and closing together said fixed and movable contact members, and upon impact of the first core portion the second core portion moves back thus allowing

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Package Frames And Binding Bands (AREA)
US00160438A 1970-10-22 1971-07-07 Electromagnetic contactor Expired - Lifetime US3708769A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7051470 1970-10-22

Publications (1)

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US3708769A true US3708769A (en) 1973-01-02

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US00160438A Expired - Lifetime US3708769A (en) 1970-10-22 1971-07-07 Electromagnetic contactor

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US (1) US3708769A (es)
CA (1) CA952164A (es)
DE (1) DE2152506A1 (es)
ES (1) ES173027Y (es)
FR (1) FR2111754B3 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120242430A1 (en) * 2010-08-17 2012-09-27 Wu Sung Jen Relay with multiple coils
US8933359B2 (en) 2011-12-29 2015-01-13 Progress Rail Services Corp Locomotive positive power bus contactor method of assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE437312B (sv) * 1983-07-11 1985-02-18 Asea Ab Elektromagnetiskt manovrerad elkopplare, exempelvis kontaktor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196231A (en) * 1960-02-12 1965-07-20 Licentia Gmbh Switch which reduces rebounding of its contacts
US3383634A (en) * 1964-06-03 1968-05-14 Naimer H L Electromagnetic switch
US3458838A (en) * 1967-09-25 1969-07-29 Smith Corp A O Electromagnetic contactor unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196231A (en) * 1960-02-12 1965-07-20 Licentia Gmbh Switch which reduces rebounding of its contacts
US3383634A (en) * 1964-06-03 1968-05-14 Naimer H L Electromagnetic switch
US3458838A (en) * 1967-09-25 1969-07-29 Smith Corp A O Electromagnetic contactor unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120242430A1 (en) * 2010-08-17 2012-09-27 Wu Sung Jen Relay with multiple coils
US8508321B2 (en) * 2010-08-17 2013-08-13 Song Chuan Precision Co., Ltd. Relay with multiple coils
US8933359B2 (en) 2011-12-29 2015-01-13 Progress Rail Services Corp Locomotive positive power bus contactor method of assembly
US9697964B2 (en) 2011-12-29 2017-07-04 Progress Rail Services Corporation Locomotive positive power bus contactor method of assembly

Also Published As

Publication number Publication date
CA952164A (en) 1974-07-30
DE2152506A1 (de) 1972-04-27
FR2111754A3 (es) 1972-06-09
ES173027U (es) 1972-02-16
ES173027Y (es) 1972-09-01
FR2111754B3 (es) 1974-06-07

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