US3261940A - Electrically controlled switching device - Google Patents

Electrically controlled switching device Download PDF

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Publication number
US3261940A
US3261940A US319812A US31981263A US3261940A US 3261940 A US3261940 A US 3261940A US 319812 A US319812 A US 319812A US 31981263 A US31981263 A US 31981263A US 3261940 A US3261940 A US 3261940A
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US
United States
Prior art keywords
core
contact
winding
switching device
aperture
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
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US319812A
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English (en)
Inventor
Polasek Karl
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
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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
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Publication of US3261940A publication Critical patent/US3261940A/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
    • H01H51/00—Electromagnetic relays
    • H01H51/27—Relays with armature having two stable magnetic states and operated by change from one state to the other

Definitions

  • the present invention refers to a relay, and more specifically to a relay comprising a core of soft magnetic material with rectangular hysteresis loop, a magnetically easily influenced contact device connected to the core, and windings arranged on the core for magnetization of the core when the contact device is to operate and for demagnetization of the core when the contact device is to release.
  • a relay formed according to the invention contemplates that a winding for demagnetization of the core occupies an approximate length 1 of the whole length of the core l -l-l between the connection points of the contact device.
  • the length 1 is obtained from the where indicates the minimum magnetizing flux through the core when the contact device is to operate;
  • qb indicates the maximum magnetizing flux through the core when the cont-act device is to release
  • R is the total reluctance of the core during operating contact of the device
  • R is the total reluctance of the core during released contact of the device.
  • 1 indicates a semicircular core of soft magnetic material, such as ferrite with a rectangular hysteresis loop.
  • windings and 11 are arranged for magnetization of the core 1 when a contact device comprising elements 2, 21 and 22 connected to the ends of the core 1, is to operate.
  • the winding 11 is essentially longer than the winding 10.
  • a hole 12 is arranged in the core 1, through which hole a reading winding 13 passes for reading of the state of the core at a given instant of time.
  • the contact device includes a contact of magnetic material arranged in a glass cover 2, the two contact parts 21 and 22 of the contact being mechanically Patented July 19, 1966 ice fastened to the ends of the core 1. The contact is broken in the rest position; it is closed when the windings 10 and 11 together cooperate to generate a magnetic flux which flows through the core 1 and the magnetic contact parts 21 and 22.
  • the current direction is changed in the winding 10. If, initially, the entire core 1 is magnetized to the remanence point +Br on the hysteresis loop of the core material, the corresponding part associated with winding 10 of the core 1 will, due to the changed current direction in the winding 10, be magnetized to the remanence point Br. Accordingly, in the limit of the core between the windings, that is, in the region about hole 12, the ferrite material will show a very low permeability, namely the onset of permeability, which reaches a value somewhere between 3 and 5. Low permeability implies high reluctance.
  • the limit zone between the windings 10 and 11 will appear as an air gap so that the fl'ux through the contact device substantially decreases and the contact is broken.
  • the amount of energy that is lost in the part of the core 1 on which the winding 10 is arranged is directly proportional to the length of the part of the core in question and isas it appears from the drawing-small. In this embodiment, it is thus no longer a question of energy balance, but rather of control power with small energy consumption.
  • the winding 10 intended for demagnetization of the core occupies an approximate length 1 of the whole length of the core l +l between the connection points of the contact device.
  • the length is obtained from the relation:
  • R is the total reluctance of the core during operating contact device
  • R is the total reluctance of the core during released contact of the device.
  • a switching device comprising first and second reedlike contact members of magnetic material disposed in normally spaced adjacent relationship to define a contact gap therebetween, a single elongated core of magnetically soft material having a substantially rectangular hysteresis loop, said core having first and second end portions magnetically connected to said first and second contact members respectively, a first winding disposed about a first length portion of said core, a second winding disposed about a second length portion of said core, said core being provided with an aperture in the region thereof between said first and second length portions, and a sense winding passing through said aperture for determining the state of magnetization of the region of said core adjacent said aperture and consequently the connection state of said contact members.
  • a switching device comprising first and second reedlike contact members of magnetic material disposed in normally spaced adjacent relationship to define a contact gap therebetween, a single elongated core of magnetically soft material having a substantially rectangular hysteresis loop, said core having first and second end portions magnetically connected to said first and second contact members respectively, a first winding disposed about a first length portion of said core, and a second winding disposed about a second length portion of said core, said second length portion being equal to the first length portion times the fraction where qb is the minimum magnetizing flux through said core when the switching device is to be actuated, rp is the maximum magnetizing fiux through said core when the switching device is to be released, R is the total reluctance of said core when the switching device is actuated and R is the total reluctance of said core when the switching device is released, said first winding being adapted to receive current of a first polarity and said second winding being adapted to receive current of said first polarity so that each

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
US319812A 1962-12-07 1963-10-29 Electrically controlled switching device Expired - Lifetime US3261940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1319762 1962-12-07

Publications (1)

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US3261940A true US3261940A (en) 1966-07-19

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US319812A Expired - Lifetime US3261940A (en) 1962-12-07 1963-10-29 Electrically controlled switching device

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US (1) US3261940A (en))
BE (1) BE640615A (en))
DE (1) DE1223459B (en))
GB (1) GB1070579A (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461386A (en) * 1966-01-17 1969-08-12 Automated Measurements Corp Coaxial switch using reed switch and assembly and system with isolated actuating coil

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2995637A (en) * 1959-07-01 1961-08-08 Bell Telephone Labor Inc Electrical switching devices
US3037085A (en) * 1959-10-22 1962-05-29 Bell Telephone Labor Inc Electrically controlled switching device
US3056868A (en) * 1959-08-03 1962-10-02 Bell Telephone Labor Inc Switching device
US3059075A (en) * 1959-10-22 1962-10-16 Bell Telephone Labor Inc Electrical switching device
US3146325A (en) * 1962-04-17 1964-08-25 Square D Co Electromagnetic contactor with pilot light
US3217122A (en) * 1961-11-01 1965-11-09 Automatic Elect Lab Bi-stable reed relay

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2995637A (en) * 1959-07-01 1961-08-08 Bell Telephone Labor Inc Electrical switching devices
US3056868A (en) * 1959-08-03 1962-10-02 Bell Telephone Labor Inc Switching device
US3037085A (en) * 1959-10-22 1962-05-29 Bell Telephone Labor Inc Electrically controlled switching device
US3059075A (en) * 1959-10-22 1962-10-16 Bell Telephone Labor Inc Electrical switching device
US3217122A (en) * 1961-11-01 1965-11-09 Automatic Elect Lab Bi-stable reed relay
US3146325A (en) * 1962-04-17 1964-08-25 Square D Co Electromagnetic contactor with pilot light

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461386A (en) * 1966-01-17 1969-08-12 Automated Measurements Corp Coaxial switch using reed switch and assembly and system with isolated actuating coil

Also Published As

Publication number Publication date
GB1070579A (en) 1967-06-01
DE1223459B (de) 1966-08-25
BE640615A (en))

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