US2303952A - Relay - Google Patents

Relay Download PDF

Info

Publication number
US2303952A
US2303952A US359882A US35988240A US2303952A US 2303952 A US2303952 A US 2303952A US 359882 A US359882 A US 359882A US 35988240 A US35988240 A US 35988240A US 2303952 A US2303952 A US 2303952A
Authority
US
United States
Prior art keywords
armature
relay
chatter
winding
tuned
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
US359882A
Inventor
Kenneth W Pfleger
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories 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
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US359882A priority Critical patent/US2303952A/en
Application granted granted Critical
Publication of US2303952A publication Critical patent/US2303952A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/50Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Description

1942. K. w. PFLEGER RELAY Filed Oct. 5, 1940 R E V R E m5 M m W WW A Q 0 Patented Dec. 1, 942
UNITED STATES PATENT OFFICE amass Kenneth w. Pfleger, Arlington, N. 5., assignor to Bell Telephone Laboratories, Incorporated,
New York, N. Y., a' corporation of New York Application October 5,1940, Serial No. 359,882
5 Claims. (01. 1 5-320) This invention relates to high speed magnetic relays of the polar type. v
The armatures of such relays frequently bounce -upon striking their contacts or pole-pieces. They may rebound more than once and such single and V multiple rebounds are commonly known as chatter.
An object of the present invention is to reduce or eliminate chatter.
This object is achieved by means of electrical damping; an electrical damping circuit magnetically coupled to the armature is tuned preferably to the principal frequency at which the relay armature tends to chatter.
In one form the electrical damping means may consist of tuned circuits including windings mounted upon and surrounding the pole-pieces of an otherwise conventional relay; in another form one or more of the windings of the energizing coil which surrounds the armature may be included in the tuned circuit.
The nature and details of these improvements may be more conveniently further described with reference to the accompanying drawings in which e figure is a top view of semi-diagrammatic nature of a standard type of polar telegraph relay having the improvements of the present invention incorporated therein.
In its fundamental features of construction the specific relaydisclosed in the present application may be similar to that disclosed in the patent to Cummings 1,624,476, granted April 12, 1927, or Curtis 1,680,667, granted August 14, 1928; it may be considered as an improvement upon relays of the type disclosed in those patents.
The relay consists of an electromagnet comprising an energizing coil 8 through which armature 9 extends. The coil 8 may and does in practice consist of one or up to several windings which may be connected to diiierent sources, such as line current sources, polarizing current sources, etc., but is conventionally illustrated as being connected to a source of positive and negative battery over a line or other conductor, which may be of any length, to an armature III of an impulse originating relay which supplies impulses to vibrate the armature 8. The armature 9 is clamped by means of a screw H or any other suitable means between magnetic members of a permanent magnet structure I2. The armature =l vibrates between adjustable contacts 13 and is limited in motion by contact members (not shown) on adjustable stop screws H which are of magnetic construction and terminate in pole-pieces ture flows into the armature structure. The armature is generally clamped between non-ma netic shims l6. So far as described the construction is conventional and known.
A description will now be given of the novel features constituting the improvements to which this specification is primarily directed. v The pole-pieces i5 may be surrounded with a winding I! included in series with a capacity I! and a resistance IS. The capacity, resistance and winding are connected in series and their values may be initially proportioned or they may be made adjustable so as to be tuned to the principal frequency of chatter and the resistance may be adjusted to introduce the required dissipating efliect for oscillatory electrical energy.
The natural period of vibration of the armature establishes the periodicity or frequency at which the most troublesome chatter takes place. This frequency may be estimated, for a relay of a particular design, from examination of oscillograms of the output current of the relay when low driving currents are used to operate it or it may be estimated from the shadow of the armature projected 'upon a rapid recording oscillagraph film. Another method which could be used is to connect an oscillator to one or more windings of the relay and vary the frequency of the oscillator until maximum response of the armature is observed, always using a driving current low enough to prevent complete operation of the armature. During this process the armature should remain on one-contact except for possible chatter and a slight motion near the pole-pieces may be observed. This observation may be made with a magnifying glass and the armature has the appearance of being thickest when the frequency corresponding to the natural period is reached. The circuit consisting of the elements l1, l8 and i 9 is then tuned or the elements predeterminedly I sponse which will be the point at which the damping circuit produces the maximum damping effect. If desired, also, the line windings may be connected to the line and a direct current kept flowing in the line winding about equal to the highest value attained 'by the line current upon a single impulse of telegraph frequency; the purpose of II through which the flux to operate the armathis is to keep relay winding in substantially the same condition that it is in when the damping of the armature is useful.
An alternative form comprises connecting one of the windings of the coil 8 in a series circuit including an adjustable condenser and a resistance. The coil 8 usually has several windings and one of the otherwise unused windings may be used for this purpose or the relay may be specially constructed, if desired, with a spare winding. The condenser 20 and the resistance 2| may be proportioned and the damping circuit tuned in accordance with the same general principles as discussed in connection with the elements I1, II and 19. The switch 22 may be employed to open the circuit consisting of the elements 20 and 2| at times and these elements may be employed either alternatively to the elements l1, I8 and N or all of them may be used together in the same relay, Preferably, however, either set but not both may be employed.
The windings I i may be mounted upon the polepieces in the form of insulated spools the body of which may consist of any suitable insulating material such as wood, hard rubber or a phenol condensation product. These spools may be slidably mounted upon the pole-pieces but fixed in place by any suitable means such as screws, adhesives, or i'rictionally during use.
What is claimed is:
1. A polar relay having means to reduce armature vibration and chatter consisting of tuned circuits each having a winding about an operating pole face of the relay and characterized in that the circuits are tuned to the natural frequency at which the armature tends to vibrate or chatter.
2. A polar relay having an armature subject to spurious vibration or chatter, one or more winding; or operating said armature, and a winding electromagnetically related to said armature included in a circuit tuned to approximately the principal frequency at which said spurious vibrations or chatter tend to occur.
3. A high speed polar relay comprising an armture, a permanent magnet structure having opposing poles within which the armature is mounted, one or more operating windings (or said armature to which currents of suitable polarity and magnitude may be applied to move the armature in either one of two opposing directions, and an anti-chatter winding surrounding said armature, said winding being included in a tunable circuit consisting of inductance and capacity with a variable resistance.
4. A polar relay having main operating winding means and means to reduce armature vibration and chatter consisting of tuned circuits each included in a supplemental winding about an operating pole face of the relay and characterized in that the circuits are tuned to the natural frequency at which the armature tends to vibrate or chatter.
5. A polar relay having an armature subject to spurious vibration or chatter from mechanical causes independent of forces applied to its operating winding to operate the armature thereof, one or more windings for operating said armature, and a winding electromagnetically related to said armature included in a circuit tuned to approximately the principal frequency at which said spurious vibrations or chatter tend to occur.
KENNETH W. PFLEGER.
US359882A 1940-10-05 1940-10-05 Relay Expired - Lifetime US2303952A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US359882A US2303952A (en) 1940-10-05 1940-10-05 Relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US359882A US2303952A (en) 1940-10-05 1940-10-05 Relay

Publications (1)

Publication Number Publication Date
US2303952A true US2303952A (en) 1942-12-01

Family

ID=23415682

Family Applications (1)

Application Number Title Priority Date Filing Date
US359882A Expired - Lifetime US2303952A (en) 1940-10-05 1940-10-05 Relay

Country Status (1)

Country Link
US (1) US2303952A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446718A (en) * 1944-11-13 1948-08-10 Gen Controls Co Thermostatic safety control for fuel burners
US2726647A (en) * 1955-12-13 Speed limit control and frequency
US2823281A (en) * 1956-09-27 1958-02-11 Iron Fireman Mfg Co High speed relay
US2859299A (en) * 1953-09-14 1958-11-04 Oak Mfg Co Chopper
US2921160A (en) * 1956-06-18 1960-01-12 Gen Motors Corp Electric switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726647A (en) * 1955-12-13 Speed limit control and frequency
US2446718A (en) * 1944-11-13 1948-08-10 Gen Controls Co Thermostatic safety control for fuel burners
US2859299A (en) * 1953-09-14 1958-11-04 Oak Mfg Co Chopper
US2921160A (en) * 1956-06-18 1960-01-12 Gen Motors Corp Electric switch
US2823281A (en) * 1956-09-27 1958-02-11 Iron Fireman Mfg Co High speed relay

Similar Documents

Publication Publication Date Title
US2245391A (en) Polarized relay
US1637442A (en) Alternating-current selector
US2303952A (en) Relay
US1901443A (en) Signaling device
US2661412A (en) Electromechanical relay
US2202906A (en) Telephone receiver
US2580123A (en) Relay
US2300638A (en) Alternating current generator
US1739752A (en) Magnetic material and appliance
US1995449A (en) Magnetic system
US2559399A (en) Polarized electromagnetic relay
US2391668A (en) Mounting means
US1644789A (en) Electromagnetic device
US2051475A (en) Relay
US2381673A (en) Electromagnetic device
US1883773A (en) Electromagnetic relay
US2844767A (en) Telephone substation ringers
US2396135A (en) Electromagnetic device
US2338208A (en) Pole changer
US2400305A (en) Electromagnetic sound recorder and reproducer
GB894184A (en) An electrical contact device
US1660864A (en) Telephone device
US1905723A (en) Vibration damping device
US2232010A (en) Vibrator system
US2479231A (en) Alternating current relay