US1979709A - Time limit contactor - Google Patents

Time limit contactor Download PDF

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Publication number
US1979709A
US1979709A US67049833A US1979709A US 1979709 A US1979709 A US 1979709A US 67049833 A US67049833 A US 67049833A US 1979709 A US1979709 A US 1979709A
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United States
Prior art keywords
armature
coil
magnetic
time
core
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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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English (en)
Inventor
Schaelchlin Walter
Frisch Erling
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Publication date
Priority to CA349926A priority Critical patent/CA349926A/fr
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US67049833 priority patent/US1979709A/en
Application granted granted Critical
Publication of US1979709A publication Critical patent/US1979709A/en
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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/58—Thermally-sensitive members actuated due to thermally controlled change of magnetic permeability

Definitions

  • Our invention relates generally to electromagnetic devices and more particularly, to time limit contactors.
  • One object of our invention is the provision of a time limit contacter, or Timetactor, that shall be simple in structure and design, eflicient in operation, and which may be readily and economically manufactured.
  • a further object of our invention is to provide for an adjustable relatively large time constant in the operation of electromagnetic devices.
  • Figure 1 is a view in side elevation, partly in section, of a time-limit electromagnetic contactor constructed in accordance with our invention
  • Fig. 2 is a front elevational view of the contactor illustrated in Fig. 1; v
  • Fig. 3 is a perspective view of the arrangement of the contact members on the electromagnetic time-limit device
  • Fig. 4 is a diagram showing one accelerating contacter or Timetactor, embodying the fea- Y tures of our invention, associated with a starting control system;
  • Fig. 5 shows a number of curves which demonstrate the characteristics possessed by the electromagnetic time-limit device constructed in accordance with our invention as compared with other types of electromagnetic time limit devices;
  • Fig. 6 shows diagrammatically a modified arrangement of the coils oi our time limit device.
  • the electromagnetic time limit device or Timetactor, illustrated, comprises a frame 30, in which a core 31 is mounted.
  • the core member 31 may be mounted in any suitable manner and in this particular showing, a bolt 32 cooperating with the frame 30 and having threaded engagement with the core, is utilized.
  • Extending substantially parallel to the core member 31 is a support 33 which,
  • An armature 34 is mounted on the support 33 and is disposed in alignment with the core 31; To mount the armature for oscillatory movement, a 50 notch 36 may be provided at the end of the supporting member 33. In the construction illustrated, the notch 36 is provided at the -junction of the end portion of support 33 and a plate 35 mounted on top oi the support and extending a short distance beyond the end of the support.
  • the simplest type of armature that is suitable for this electromagnetic time limit device is aI metal plate which is cut square at the end, or preferably out by planes forming an acute angle 7 at one edge of the end of the armature adjacent the end of the support 33. Further, to provide for a free pivotal movement of the armature when mounted in the notch 36, the walls dening 'the notch should be spaced at an angle greater than a right angle. The size of the angle of the notch as well as the size oi the acute angle at the upper end of the armature will be determined by the desired angle of swing of the armature.
  • the plate 35 is bent upwardly at a point near the upper righthand end of the support 33. ,A It will be readily understood that a suflicient and free angular motion of the armature may be obtained if the angle of the notch 36 is made slightly greater than the sum 0i the angle of movement and the acute angle at the knife edge of the armature coacting with the notch 36.
  • a rectangular notch 33 is cut in the projecting bent portion of the plate 35.
  • the plate 35 is cut at two places to form a tongue 39 which ls bent upwardly much more than the end portion of plate 35 forming, in part, the notch 36.
  • a bracket 40 is mounted on the armature and provided with an extension or tongue 41 which extends through the notch 38.
  • the upper tongue 39 which is integral with 10o plate 35, is provided with a slot 42, extending inwardly from the end, for receiving a bolt 43, while the tongue 41 has an opening through which the bolt extends.
  • a spring 45 is mounted on the bolt 43 and is disposed to bias the armature 34 counterclockwise about the knife edge 37. In this manner, the armature is retained in position, the tongue 41 engages the two sides of the notch 38 to prevent lateral movement, while the Spring is biases it upwardly inte the notch as. 11
  • the armature may be readily removed by ccmpressing the spring and forcing the bolt 43 upwardly and out of slot 42.
  • the bolt 43 is provided withv an adjustable nut 46 whereby any desired spring ten- I armature rmly against the amature receiving l5 v surface 60.
  • the armature is also provided with auxiliary contact members 14. As will be apparent from Figs. 3 and 4, contact members 26 and 27 engage before contact members 14 -are opened. This feature is desirable when utilizing ourV contactorhowever,- not very important'in this invention.
  • the important feature is that the armature, actuated by the adjustable spring 45 and controlled y by the tube or sleeve 23 and the effect of the coils 5 and 11, moves to close contact 'members 26 and 27 a longer time interval after the attendant has set up the necessarycircuits for the operation of the contactor than any electromagneic time limit relay or electromagnetic contactor heretofore known to us.
  • the core 31 is provided-with an armature receiving face 60.
  • a copper'sleeve 23 is mounted directly on the core.
  • This sleeve need not necessarily be of copper but may be silver, aluminum, or any other material having a relatively low re@ sistance value, and of such properties that currents are induced therein when the magnetic ux threading thel sleeve, i. e., the iiux in the core 31, is varied.
  • a main magnetizing coil 1l is mounted o'n the sleeve 23.
  • this coil 11 may be constructed to have any desired number of turns of suitable conductors, which will depend on operating conditions to be met.
  • a neutralizing coil 5 is mounted on themagnetizing coil. 'I'his coil is so constructed,
  • a ring 23' mounted directly on the core 31 at one end thereof; a coil 11', serving ,as a main magnetizing coil, mounted at the mid features of our invention can probably be had from a discussion of the operation of the time- Lavare@ sistor 4 and conductor 7 to the bus 8.
  • the neutralizing coil 5.of the timev limit contactor, or 'Iimetactor" 6 is shown interconnected with resistor 4 by a potentiometer circuit arrangement whereby the eiect of theneutralizing coil may be varied at will.
  • the operation of the contactor 16 causes the opening of the contact mem- -bers 12 an instant after the closing of the contact members 22.
  • the energizing circuit for the main or magnetizing coil 11 of the contactor 6 is thus interrupted, and the motor circuit is established from bus 1 through the series'field 19, motor 20, starting resistor 21, conductor ⁇ 28, and contact members 22 to the bus 8. The motor thus starts to accelerate. l
  • Movement of the armature 34 removes the resistor 21 from the motor circuit by the'shunt circuit through conductors 24 and 25, and the contact members 26 and 27. l
  • FIG. 1 shows the decay of the magnetic flux in the mag- .netic .circuit of a solenoid when the coil of the solenoid is deenergized. More particularly this curve shows the decay of the magnetic ux in ⁇ - the magnetic circuit of a relay such as is shown in Fig. 1 but wherein but one coil is used and no shim vis used between the armature 34 and core core 31.
  • Fig. 5 shows more clearly how our new time contacter functions.
  • a maximum time constant of only a trifle over six seconds could be secured whereas with oui ⁇ device a maximum time constant of over twelve seconds can be secured.
  • a relay structure having two coils, namely, a magnetizing and a neutralizing coil fairly reliable operation can be secured at about three seconds, whereas with our device, utilizing the combination of an adjustable neutralizing coil, a magnetizing coil and a copper tube, a very reliable operation can be obtained at six seconds.
  • an electromagnetic time-limit device in combination, a core member', an armature, means including an adjustable spring for biasing the armature away from said core, a main coil for magnetizing vthe core member to eiiect an operation'o! the armature, a control coil disposed to be energized 'when the main coil is deenergized to delay the decay of the magnetic flux produced by the main coil, and a third coil adapted to dissipate the residual magnetic ilux in the core members when the main coil is deenergized and in coaction with said control coil to increase the time during which the magnetism of the core dissipates at a rapid rate and thus increase the definite period oi time during which positive functioning or the armature may be obtained.
  • an electromagnetic time-limit device in combination, a core member, an armature disposed to coact with said core member, means for biasing said armature away from said core member, a coil for causing a magnetic ilux in said core member, a second coil for dissipating the tlux of said ilrst named coil when the nrst named coil is deenergized, and a low resistance closed circuit inductively related to said coil adapted to delay the dissipation of the magnetic flux when ysaid rst named coil is deenergized.
  • a magnetic circuit means biased to one operating position and responsive to changes in magnetic iiux in the magnetic circuit to thereupon take a second operating position, a coil for producing a magnetic ilux in said magnetic circuit to cause said means to take said second operating position, a neutralizing coil adapted to lengthen the time during which the magnetism in the core member dissipates at a rapid rate when said first named coil is deenergized, and means for decreasing the rate of dissipation of the magnetic iux in the core member when said rst named coil is deenergized.
  • a magnetic circuit in combination, a magnetic circuit, means for producing a magnetic flux in said circuit, means for decreasing the rate of decay of said magnetic ux when said means for producing the iiux are rendered ineiective, and means for lengthening the time during which the ux decays in said magnetic circuit.
  • an electromagnetic time-limit device in combination, a magnetic circuit, a coil disposed to produce a magnetic ux in said circuit, a closed circuit inductively related to said coil for decreasing the rate of decay of the magnetic ux in said circuit when the coil is deenergized, and a neutralizing coil disposed to dissipate the residual magnetic flux in said circuit to continue the decay of the flux, whereby the time during which the decay is continued is lengthened.
  • an electromagnetic time-limit device in combination, a movably mounted armature, means for biasing the armature to predetermined positions, an electromagnet from which, when deenergized, the lines of magnetic force dissipate rapidly until substantially only the lines of magnetic force constituting the residual magnetism remain, means for decreasing the rate of dissipation of the magnetic force whereby a longer time is required for any given magnetic force to dissipate till only the residual magnetic force remains, and means, associated with the electromagnet. adapted to dissipate the residual magnetic torce when the electromagnet is deenergized to-continue said dissipation of the magnetic torce in the electromagnet to permit the operation ofthe armature under the iniluence of the biasing means.
  • a movably mounted armature in combination, a movably mounted armature, means for biasing-the armature to a predetermined position, anielectromagnet from which, when deenergized, the magnetic iiux decays at a rapid rate until substantially only the residual magnetic iiux remains, said electromagnet, when energized, being adapted to actuate said armature against said biasing means, control means for dissipating the residual magnetic ux of the electromagnet to increase the time during which the iuxdecays at 'a rapid rate, and means for decreasing the rate of the rapid decay to further lengthen the time during which the magnetic ilux dm, thereby increasing the time during whichthe positive functioning of the armature may be obtained in response to the force of said A 8.
  • an electromagnetic time-limit device in combination, a movably mounted armature.
  • adjustable means for adjustably biasing the armature to a predetermined position, an electromagnet from which, when deenergized, the magnetic ux decays at'a rapid rate until substantially only the residual magnetic iiux remains, said electromagnet, when energized, being adapted to actuate said armature against said biasing means-adjustable control means for dissipating the residual magnetic flux of the electromagnet to selectively increase the time by a substantially predetermined: amount during which the flux decays at a rapid rate, and means for decreasing the rate of the rapid decay to further lengthen the time during which the magnetic ux decays, thereby increasing the time during which the positive functioning of the armature'may be obtained in response to the force of said biasing means.
  • an electromagnetic time-limit device in combination, a frame, a core member carried by the frame and provided with an armature-receiving face, an armature supporting member mounted onthe frame, an armature disposed to cooperate with the core member and carried by the supporting member, said supporting member being provided with a notch for receiving an end of the armature, the end of the armature disposed in the notch being provided with a knife edge, the angular extent of the end of the armature about the knife edge being less than the angular spacing of the walls oi the notch, thereby to permit oscillatory movement of the armature in the notch, means for biasing the armature being disposed to retain the armature in position in the notch, a main energizing coil mounted on the core for drawing the armature into engagement with the core member, means Yfor decreasing the rate of decay of the magnetic ux produced'by said maincoil when said main coil is deenergized to thus increase the time of decay of the flux, and an electromagnetic time-
  • an electromagnetic time-limit device in combination, a frame, a core member carried by the frame provided with an .armature receiving to a predetermined position, said biasing means face, an amature supporting member mounted on the frame, an armature disposed to cooperate with the core member and carried by the supporting member, said supporting member being provided with a notch for receiving an end of the armature, the end of the armature disposed in the notch being provided with a knife edge, the angular extent of the end of the armature about the knife edge being lessthan the angular spacing of the walls of the notch, thereby to permit oscillatory movement of the armature in the notch, adjustablel means for adjustably biasing the armature to a predetermined position, said biasing means 'being disposed to retain the armature in position in the notch, a main energizing coil mounted on the core for drawing the armature into engagement with the core member, for decreasing the rate of decay of the magnetic ux produced by said main coil when said main coil is
  • an auxiliary coil having means' for adjusting its eiect and thus adapted to dissipate at an adjustable rate the residual magnetic flux in the core when the main coil is deenergized, to thus permit said biasing means to actuate the armature out of engagement with the core.
  • a movably mounted armature in combination, a movably mounted armature, adjustable biasing means for biasing the armature to a. predetermined position, an electromagnet for actuating the armature against the action of said biasing means, means for causing the lines of flux to dissipate at a rapid rate and continuously to substantially zero upon the deenergizetion of the electromagnet, and means for decreasing the rate of dissipation of said iiux, whereby a positive operation of the armature is secured at a predetermined time after deenergization of said Aelectromagnet depending on the adjustment of said biasing means.
  • an electromagnetic time-limit device in combination, -a movably mounted armature, adjustable spring means for biasing the amature by any selected biasing force to a predetermined 12o position, an electromagnet disposed to actuate said armature against the action of said spring means, control means for decreasing the rate of decay of the magnetic ux of said electromagnet, and a coil associated with the electro e; et for dissipating the iiux, continuously, at substantially the rate determined by said rate control means,V and to substantially zero, upon the deenergizetion of the electromagnet, thereby to permit the positive operation of the armature at a predetermined instant depending upon the adjustmen of the-biasing means.
  • a core member in combination, a core member, a spring biased armature cooperating with the core member, a coil for magnetizing the core member to effect the operation of the armature, means for controlling the rate of decay of the magnetic ux produced by said coil when the coil is deenergized, and an auxiliary coil adapted to eect a substantially constant rate of dissipation of the residual magnetism of the core from the maximum residual energized condition to zero, thereby to obtain operation of the armature at any predetermined time during the process of the dissipation of the l45 residual magnetism in response to the biasing force of the spring biased armature.
  • armature means cooperating with the core member for varying the biasing force applied to the armature, a main coil for magnetizing the core member to effect the operation oi.' the amature, means for decreasing the rate of decay of the magnetic flux produced by said coil when the coil is deenergized, and an auxiliary coil, the magnetic effect of which may be varied, disposed to effect a substantially constant dissipation of the residual magnetism of the core from the maximum residual energized condition to zero, thereby to obtain a positive action of the armature at any predetermined time during the process of the dissipation of the residual magnetism in response to adjustments of said means for varying the biasing force of the spring biased armature.
  • an electromagnetic time-limit device in combination, a core member, an armature, a spring for biasing the armature to a predetermined position, a coil for magnetizing the core member to effect the operation of the armature, control means for decreasing the rate of dissipation of the magnetic flux in the core member when the coil is deenergized, and a neutralizing coil disposed to effect a substantially constant dissipation, at a rate determined by the control means, of the residual magnetism of the core from a maximum energized condition to zero, thereby to obtain a positive action of the armature at any predetermined time during the process oi dissipation of the residual magnetism.
  • a core member in combination, a core member, an armature, a spring for biasing the armature to a predetermined position, spring means 'ior varying the biasing force of the spring, a main coil for magnetizing the core member to effect the operation of the armature, control means for decreasing the rate of dissipation of the magnetic flux in the core member when the main coil is deenergized, and a neutralizing coil disposed to eiect a substantially constant dissipation, at a rate determined by the control means, of the residual magnetism of the core from a maximum energized condition to zero, thereby to provide operation of the armature at any predetermined time during the process of dissipation of the residual magnetism, in response to adjustments of the means for varying the biasing force of the spring t'nat is applied to the armature.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnets (AREA)
US67049833 1933-05-11 1933-05-11 Time limit contactor Expired - Lifetime US1979709A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA349926A CA349926A (fr) 1933-05-11 Contacteur a retard
US67049833 US1979709A (en) 1933-05-11 1933-05-11 Time limit contactor

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CA349926T
US67049833 US1979709A (en) 1933-05-11 1933-05-11 Time limit contactor

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509724A (en) * 1946-09-06 1950-05-30 Cibie Pierre Adjustable spring pivot for relay armatures
US3005936A (en) * 1958-07-10 1961-10-24 Westinghouse Electric Corp Electromagnetic timing device
US4896126A (en) * 1988-02-17 1990-01-23 Siemens Aktiengesellschaft Coil for an electromagnetic relay having delayed switching
US5140203A (en) * 1988-09-27 1992-08-18 Mannesmann Rexroth Gmbh Control motor for a servo-valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509724A (en) * 1946-09-06 1950-05-30 Cibie Pierre Adjustable spring pivot for relay armatures
US3005936A (en) * 1958-07-10 1961-10-24 Westinghouse Electric Corp Electromagnetic timing device
US4896126A (en) * 1988-02-17 1990-01-23 Siemens Aktiengesellschaft Coil for an electromagnetic relay having delayed switching
US5140203A (en) * 1988-09-27 1992-08-18 Mannesmann Rexroth Gmbh Control motor for a servo-valve

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Publication number Publication date
CA349926A (fr) 1935-04-30

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