US2285936A - Electrical relay - Google Patents

Electrical relay Download PDF

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Publication number
US2285936A
US2285936A US399145A US39914541A US2285936A US 2285936 A US2285936 A US 2285936A US 399145 A US399145 A US 399145A US 39914541 A US39914541 A US 39914541A US 2285936 A US2285936 A US 2285936A
Authority
US
United States
Prior art keywords
armature
relay
flux
legs
core
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
US399145A
Other languages
English (en)
Inventor
Mishelevich Benjamin
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.)
Hitachi Rail STS USA Inc
Original Assignee
Union Switch and Signal Inc
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
Priority to BE477734D priority Critical patent/BE477734A/xx
Application filed by Union Switch and Signal Inc filed Critical Union Switch and Signal Inc
Priority to US399145A priority patent/US2285936A/en
Application granted granted Critical
Publication of US2285936A publication Critical patent/US2285936A/en
Priority to GB14615/42A priority patent/GB560870A/en
Priority to FR950684D priority patent/FR950684A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current

Definitions

  • My invention relates to electrical relays, and it has particular reference to tractive armature type electrical relays of the class employed as track relays in railway track circuits.
  • Such a relay must, of course, be designed to create its pick-up energy level, at least, in order to insure that the relay armature will be picked up properly, and as a result once this armature has reached its attracted position, the energy level in the relay then .exceeds by a considerable degree that necessary to maintain the armature in its picked-up position.
  • the shunt In order for a train shunt to be effective to release such a relay, the shunt must be sufficiently low in resistance to shunt away from the relay winding the increment of energy above the drop-away energy level of the relay.
  • Such shunt provides a low resistance or short-circuit path across the relay winding which snubs the release of the armature by maintaining the flux in the relay for an appreciable interval of time, so that a correspondingly long time interval is required for even a low resistance train shunt to lower the energy level of the relay below its drop-away value.
  • Various means have been proposed heretofore to obviate the slow releasing characteristics of tractive armature relays when shunted, and to provide relays having quick release, slow pick-up characteristics.
  • My invention is directed to the provision of novel and improved means for obtaining quick release characteristics in tractive armature type relays.
  • Another object is to provide novel and improved forms of electrical relays particularly suitable for use as track relays in railway track circuits.
  • Afurther object is the provision of novel and improved means for obtaining quick release, slow pick-up characteristics in a tractive armature level only slightly. less than its pick-up energy level.
  • Fig. l is a diagrammatic view illustrating a preferred form of apparatus embodyingmy invention.
  • Figs. 2a, 2b and 2c are views showing diagrammatically the, magnetic circuits of the fluxes in the relay for various different positions of the relay armature.
  • Figs. 3a, 3b and 3c are diagrammatic views showing the connections of the relaywindings for the different positions of the armature represented in Figs. 2a, 2b, and 20, respectively.
  • similar reference characters have beenemployed to designate corresponding parts.
  • the reference characters I and I a designate the track rails of a stretch of railway track divided by insulated joints 2 into an insulated track section DE.
  • Section DE is provided with a track circuit comprising a suitable source of energy, such as a track battery 3, connected through a resistor 4 to the rails at oneend E. of the section, and the operating windings of a track relay TR connected across the rails at the other end of the section.
  • Relay TR comprises a three-legged core structure having threemagnetizable cores or legs 5, B and 1 connected together at one end by a backstrap .8.
  • Windings 9, l0 and H are disposed on legs 5, 6 and 1, respectively, for causing a tractivetype armature-I2 pivoted at l3 adjacent one of the outer legs; 5 of the core, to swing toward and away from the three legs simultaneously.
  • the one core leg' I disposed mostremote from pivot I 3 of ,armature I 2 is provided with means, such as a copper ferrule M, for at times delaying achange of flux threading the leg.
  • Armature I2 is provided in the usual manner with one or more contact members, such as member I5, for effecting control of external circuits, and also with a bifurcated contactmember 16 comprising a common or bridging memfer type contact combination.
  • the fluxes due to current in the windings are provided with the magnetic circuits represented in Fig. 2b.
  • Ihe flux due to current in winding 9 is provided with a circuit comprising leg and in multiple, the other two legs 6 and l, but due to the relative reluctances of the air gaps between armature I2 and legs 6 and l, substantially all of the flux threads leg 6, as indicated in Fig. 21).
  • the flux (indicated in Fig.
  • a relay incorporating means for varying the torque arm of the magnetic force exerted on the relay armature so as to provide a relay having a drop-away energy level only slightlyv less than its pick-up level, thereby obtaining quick release characteristics in a tractive type armature relay.
  • a relay embodying my invention embodies means for delaying the, pick-up of the armature without affecting its release.
  • an electrical relay having an armature pivoted about an axis and contacts controlled arm:about said axis and the other having a .Shorter effective. moment arm, and means controlled by contacts of said armature for causing a resultant flux to circulate in both said circuits or in said other but not said one circuit according as said armature is released or picked up, respectively, whereby to vary the eifective moment arms of the magnetic forces exerted on said armature and reduce the torque available to hold the armature up after it has picked up.
  • an armature pivoted about an axis, a magnetizable core having two magnetic circuits through said armature, one of said circuits having a relatively long effective moment arm about said axis and the ther having a shorter effective moment arm, means for circulating flux through said other magnetic circuit, and means controlled by said armature for causing a resultant flux to circulate in or not to circulate in said one magnetic circuit according as said armature is released or picked up, respectively, whereby to vary the moment arm of the magnetic force exerted on said armature to provide the relay when shunted, with quick release characteristics.
  • An electrical relay comprising, in combination, an armature pivoted about an axis, three magnetizable cores one positioned remote from said axis and the other two positioned intermediate said one core and said axis, means controlled by said armature and efiective when it is released for energizing said remote core and one of said two other cores, and means effective when said armature is picked up for energizing both of said two other cores but not said remote core, whereby to decrease the efiective torque on .said armature when said armature is picked up.
  • An electrical relay comprising, three magnetizable cores, connected together at one end by a magnetizable backstrap, three windings one on each of said cores, an armature pivoted about an axis disposed adjacent one of said cores, means efiective when said armature is released for energizing the windings on said one core and the core most remote from said axis, to create flux having an additive action in picking up said armature, and means effective when said armature is picked up for energizing the windings on said one core and on the remaining core, to create flux having an additive action through said last-mentioned two cores but having an opposing action in said remote core, whereby to decrease the moment arm of the magnetic force on said armature when picked up, to increase the release value of the relay.
  • an electrical relay having an armature pivoted about an axis and contacts controlled by the position of said armature, a magnetizable core having two magnetic circuits each including a portion of the armature, one of said circuits having a relatively long effective moment arm about said axis and having means for delaying a change of flux in said circuit, the other of said magnetic circuits having a shorter effective moment arm about said axis, and means controlled by contacts operated by said armature for causing a resultant flux to circulate in both said circuits or in said other but not said one circuit according as said armature is released or picked up, respectively, whereby to vary the efiective moment arms and torque of the magnetic forces exerted on said armature and provide a delay in the growth of flux in said core without delaying the decay of flux.
  • an electrical relay having an armature pivoted about an axis for swinging movement toward and away from a magnetizable core comprising three legs one disposed remote from the said axis and the other two positioned intermediate said one leg and said axis, said legs being connected together at their ends remote from said armature, windings disposed on each of said legs, means controlled by said armature and effective when it is released for energizing the winding on said remote leg and the winding on the leg nearest said axis, by current having a polarity selected with respect to the direction of the windings to cause the fluxes due to such current to assist in swinging said armature toward said core, and means controlled by said armature when it is picked up for energizing the winding on said nearest leg and the winding on the remaining leg, by current having a polarity selected with respect to the direction of the windings to cause opposing fluxes to circulate in said remote leg, whereby to vary the effective torque arm of the fluxes acting on said
  • a track relay for use in a railway track circuit where it is controlled by the application of a low resistance train shunt across the relay windings, comprising the combination of an armature pivoted about an axis for swinging movement toward and away from a magnetizable core comprising three legs one disposed remote from said axis and the other two disposed intermediate said remote leg and said axis, said legs being connected together by magnetizable material at their ends remote from said armature, three windings one disposed on each of said legs, contacts controlled by said armature, and circuit means including a back contact operated by said armature for energizing the winding on said remote leg in series the winding on one of said other two legs, the direction of the windings on the core being arranged to cause the fluxes due to currents in the two mentioned windings toassist in swinging said armature toward said core, and other circuit means including a front contact operated by said relay for energizing in series the two windings on said two other legs, the
  • a railway track circuit comprising a source of current connected over a pair of track rails to a track relay having an armature pivoted about an axis for swinging movement toward and away from a magnetizable core, said core comprising three legs one disposed remote from said axis and two other legs disposed intermediate said remote leg and said axis, said legs having their ends remote from said armature connected by magnetizable material, contacts controlled by said armature, and means including a back contact operated by said armature for circulating flux through said three core legs through two magnetic circuits, and means including a front contact operated by said armature for circulating flux through a magnetic circuit comprising said two other core legs but not said remote core leg, whereby to vary the effective torque arm of the flux about said axis to reduce the energy available to hold said armature in its attracted position and increase the shunting sensitivity of the track circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
US399145A 1941-06-21 1941-06-21 Electrical relay Expired - Lifetime US2285936A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE477734D BE477734A (enrdf_load_stackoverflow) 1941-06-21
US399145A US2285936A (en) 1941-06-21 1941-06-21 Electrical relay
GB14615/42A GB560870A (en) 1941-06-21 1942-10-19 Improvements relating to electrical relays
FR950684D FR950684A (fr) 1941-06-21 1947-07-31 Relais électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US399145A US2285936A (en) 1941-06-21 1941-06-21 Electrical relay

Publications (1)

Publication Number Publication Date
US2285936A true US2285936A (en) 1942-06-09

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ID=10044429

Family Applications (1)

Application Number Title Priority Date Filing Date
US399145A Expired - Lifetime US2285936A (en) 1941-06-21 1941-06-21 Electrical relay

Country Status (4)

Country Link
US (1) US2285936A (enrdf_load_stackoverflow)
BE (1) BE477734A (enrdf_load_stackoverflow)
FR (1) FR950684A (enrdf_load_stackoverflow)
GB (1) GB560870A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256402A (en) * 1964-01-02 1966-06-14 Gen Electric Switch relay for use in electric motors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256402A (en) * 1964-01-02 1966-06-14 Gen Electric Switch relay for use in electric motors

Also Published As

Publication number Publication date
GB560870A (en) 1944-04-25
FR950684A (fr) 1949-10-04
BE477734A (enrdf_load_stackoverflow)

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