US3389354A - Electromagnetic relays - Google Patents

Electromagnetic relays Download PDF

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Publication number
US3389354A
US3389354A US513483A US51348365A US3389354A US 3389354 A US3389354 A US 3389354A US 513483 A US513483 A US 513483A US 51348365 A US51348365 A US 51348365A US 3389354 A US3389354 A US 3389354A
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US
United States
Prior art keywords
armature
core
release
movement
plate
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
US513483A
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English (en)
Inventor
Ahlberg Curt Fredrik
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US3389354A publication Critical patent/US3389354A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01H50/30—Mechanical arrangements for preventing or damping vibration or shock, e.g. by balancing of armature
    • H01H50/305—Mechanical arrangements for preventing or damping vibration or shock, e.g. by balancing of armature damping vibration due to functional movement of armature

Definitions

  • ABSTRACT OF THE DISCLOSURE An electromagnetic relay in which the movement of the armature into and out of its position of attraction is damped or cushioned by interposing a flexible member which when the armature moves toward the core softens the impact thereof upon the core by spring action and which when the armature moves away from the core accelerates the initial armature movement and causes a more uniform decrease of the magnetic field then acting upon the armature.
  • a characteristic of electromagnetic relays, for example telephone relays, of a conventional design is that the movement of the armature is markedly irregular having a considerable increase of velocity at the end of the movement, upon release as well as upon attraction.
  • electromagnetic relays which should be quick to attract or release and therefore are supplied with great power or are designed with a magnet core having small eddy current losses, the final velocity of the armature will be so great that the striking against the magnet core upon attraction respectively against the yoke upon release is followed by rebounding and spring vibrations.
  • the present invention has for a purpose to reduce by means of. simple means the velocity of motion of the armature at the end of the movement to so low a value that the impacts will cause no danger. This is achieved by means of a resilient residual plate located in the air gap between the armature and the magnet core, so arranged, that the resilient residual plate upon attraction during the last part of the movement of the armature increases the load of the armature and upon release hastens the starting of the releasing movement, so that the movement of the armature is controlled by the decreasing magnetic field.
  • FIGS. 1-3 The invention will be described below with reference to the enclosed drawings, FIGS. 1-3.
  • FIG. 1 shows a telephone relay with a residual plate according to the invention.
  • FIG. 2 shows the residual plate as seen from the pole end of the core in the-air gap.
  • FIG. 3 shows an embodiment of the residual plate.
  • FIG. 1 shows an angularly bent yoke 1 which carries a coil assembly 2 consisting of an iorn core 211, a coil 2b and end plates 2c, 2d.
  • the yoke further carries an armature 3 and a contact spring assembly 5.
  • the armature 3 is provided with a residual plate or strip 4 and a lever 31:. Initially, the effect of the residual plate 4 will be left out of consideration.
  • the armature Upon release of the relay the armature is held a short while due to eddy currents in the iron core, the armature and the yoke and generally also due to a current flow from the magnet coil to a resistance connected in parallel with the magnet coil, for example for spark extinction.
  • the magnetic field disappears comparatively swiftly and, when the attractive power of the armature becomes less than the spring load, the armature will release and the air gap will increase.
  • the magnetic field decreases very swiftly and in spite of a voltage being induced in the coil 2b, which voltage may increase the current through the magnet coil, the armature will make a strongly accelerating movement until the lever 3a strikes against the yoke 1.
  • the armature often bounces back and actuates again the contact spring assembly 5. Such a rebounding and all the contact vibrations arising upon the release, are undesirable :phenomena.
  • the acceleration of the armature upon operation may be decreased by arranging the total spring load for example by adding additional springs to assembly 5 or by separate springs so that the load increases in accordance with the increase of the magnetic field.
  • the armature is held until the spring load becomes predominant and hereby the magnetic energy has been substantially consumed and therefore the release step after the armature has begun .to move, has occurred very swiftly.
  • the residual plate or strip 4 is according to the invention resilient.
  • the release of the armature thus starts as soon as the magnetic field begins to decrease and the magnetic field will control the movement of the armature during the whole release time.
  • the release time does not increase as happens with such known methods as slow action by means of copper rings or parallel-connected resistances, but the time of the movement of the armature is extended to encompass all the time that is needed for the disappearing of the field, in-
  • the armature 3 is equipped with two residual plates 4a, 4b placed one on the other.
  • the two residual plates are angularly bent and resilient.
  • the angular point of plate 4a rests against the armature and the angular point of the second plate 4b is turned against the core 2a.
  • the shanks of the residual plates rest against each other and the longer shanks are fastened to the armature with joint rivets close to the bearing of the armature.
  • At least one residual plate in FIG. 1 In order that the residual plates should not unnecessarily increase the non-magnetic gap between the armature and the iron core, at least one residual plate in FIG.
  • An electromagnetic relay comprising in combination: a yoke; a core supported on the yoke; an exciting coil supported by the core and encompassing the same; a stationarily mounted contact spring load means; an armature pivotally supported by the yoke, said armature coacting with said load means so as to be urged by the spring action thereof into a rest position defining an air gap between the core and the armature, exitation of said coil causing attraction of the armature into an attracted position against the spring action of the load means; and a yieldable damping member partly bridging said air gap in the rest position of the armature, said damping member being in the form of an elongate springy plate having two portions defining an obtuse angle therebetween, one of said portions being secured on one end to the armature resting with its length flatly upon the same on the side thereof facing the core and the other portion of the plate extending at said obtuse angle into said air gap and toward the core, the other of said portions engaging'the
  • An electromagnetic relay according to claim 1 wherein a second springy plate having two portions defining an obtuse angle therebetween is disposed upon the first springy plate in opposition to the angle defined by the portions of said plate and secured to the armature at the end of one of its portions.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
US513483A 1965-03-06 1965-12-13 Electromagnetic relays Expired - Lifetime US3389354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE294865 1965-03-06

Publications (1)

Publication Number Publication Date
US3389354A true US3389354A (en) 1968-06-18

Family

ID=20261062

Family Applications (1)

Application Number Title Priority Date Filing Date
US513483A Expired - Lifetime US3389354A (en) 1965-03-06 1965-12-13 Electromagnetic relays

Country Status (5)

Country Link
US (1) US3389354A (hr)
BE (1) BE677360A (hr)
FR (1) FR1462903A (hr)
GB (1) GB1133667A (hr)
NL (1) NL6602582A (hr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479627A (en) * 1966-09-15 1969-11-18 Cornell Dubilier Electric Electromagnetic relay and method of manufacture thereof
US3581256A (en) * 1968-03-28 1971-05-25 Int Standard Electric Corp Shock resistant armature for electro-magnetic devices
US4078220A (en) * 1976-12-27 1978-03-07 Allis-Chalmers Corporation Contactor having means to inhibit contact welding caused by jamming of the armature
US4910484A (en) * 1987-03-06 1990-03-20 Takamisawa Electric Co., Ltd. Electromagnetic relay having silencing effect
US4945331A (en) * 1988-07-29 1990-07-31 Citizen Watch Co., Ltd. Electromagnetic actuator
FR2803430A1 (fr) * 1999-12-29 2001-07-06 Schneider Electric Ind Sa Electroaimant pour appareil interrupteur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4112349C2 (de) * 1991-04-16 2001-06-07 Schupa Gmbh Elektromagnetischer Stromstoßschalter
FR2789513B1 (fr) * 1999-02-04 2003-06-06 Chauvin Arnoux Relais du type a culasse en forme d'un l et a armature mobile montee pivotante sur l'arete d'une branche de la culasse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL42368C (hr) *
DE525107C (de) * 1931-05-22 Fuld & Co Telephon Und Telegra Elektromagnetisches Relais
US3148313A (en) * 1962-08-03 1964-09-08 Amphenol Borg Electronics Corp Noise-eliminating means for selfwinding electric clocks
US3207961A (en) * 1963-09-25 1965-09-21 Gen Motors Corp Linear relay actuator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL42368C (hr) *
DE525107C (de) * 1931-05-22 Fuld & Co Telephon Und Telegra Elektromagnetisches Relais
US3148313A (en) * 1962-08-03 1964-09-08 Amphenol Borg Electronics Corp Noise-eliminating means for selfwinding electric clocks
US3207961A (en) * 1963-09-25 1965-09-21 Gen Motors Corp Linear relay actuator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479627A (en) * 1966-09-15 1969-11-18 Cornell Dubilier Electric Electromagnetic relay and method of manufacture thereof
US3581256A (en) * 1968-03-28 1971-05-25 Int Standard Electric Corp Shock resistant armature for electro-magnetic devices
US4078220A (en) * 1976-12-27 1978-03-07 Allis-Chalmers Corporation Contactor having means to inhibit contact welding caused by jamming of the armature
US4910484A (en) * 1987-03-06 1990-03-20 Takamisawa Electric Co., Ltd. Electromagnetic relay having silencing effect
US4945331A (en) * 1988-07-29 1990-07-31 Citizen Watch Co., Ltd. Electromagnetic actuator
FR2803430A1 (fr) * 1999-12-29 2001-07-06 Schneider Electric Ind Sa Electroaimant pour appareil interrupteur

Also Published As

Publication number Publication date
BE677360A (hr) 1966-08-01
GB1133667A (en) 1968-11-13
NL6602582A (hr) 1966-09-07
FR1462903A (fr) 1966-12-16

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