US3611222A - Magnetoelectric indicating device with a great scale range - Google Patents

Magnetoelectric indicating device with a great scale range Download PDF

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Publication number
US3611222A
US3611222A US44518A US3611222DA US3611222A US 3611222 A US3611222 A US 3611222A US 44518 A US44518 A US 44518A US 3611222D A US3611222D A US 3611222DA US 3611222 A US3611222 A US 3611222A
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US
United States
Prior art keywords
magnetic
cheek
cheek member
magnetoelectric
indicating device
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
US44518A
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English (en)
Inventor
Henri Joseph Sauvignet
Rene Auguste Joseph Goyon
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.)
Compteurs Schlumberger SA
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Compteurs Schlumberger SA
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Filing date
Publication date
Application filed by Compteurs Schlumberger SA filed Critical Compteurs Schlumberger SA
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Publication of US3611222A publication Critical patent/US3611222A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R5/00—Instruments for converting a single current or a single voltage into a mechanical displacement
    • G01R5/02—Moving-coil instruments
    • G01R5/04—Moving-coil instruments with magnet external to the coil

Definitions

  • the device comprises a magnetic circuit formed by an annular permanent magnet secured between the peripheral rims of two cheek members of which one is divided into two equal parts, the frame ofa mobile assembly being engaged on one of the rims and the device being provided with an adjustable magnetic shunt.
  • the present invention relates to a magnetoelectric indicating device with a wide scale range composed of a plurality of simple parts.
  • Conventional magnetoelectric devices generally comprise a magnetic circuit obtained by assembling a pennanent annular magnet secured between two concentrical cheek members which are cut and formed to receive the mobile assembly of the device.
  • One of the cheeks is either apertured or formed with two separate parts for introducing the coil of the mobile assembly.
  • the assembling may be made by moulding of plastic material which makes difficult the disassembly of the device.
  • the present invention makes it possible to combine accuracy of the indicating device with disassembly at competitive prices.
  • the device comprises a mobile assembly and a magnetic circuit obtained by assembling a permanent annular magnet secured between two cheek members provided with peripheral annular portions and shaped to receive the coil of the mobile assembly and providing the free displacement thereof, and wherein the magnetic circuit is formed by an annular permanent magnet secured between the respective peripheral portions of the two cheeks, the first cheek being, moreover, divided into two equal parts according to a symmetry plane separating magnetic bridges connecting the peripheral annulus to a central annulus of the first check, the mobile assembly being provided with a spindle placed in said symmetry plane, the frame of the mobile assembly being engaged to the first cheek, the first cheek and the magnet being fitted at the outside of a structure centered on a concentric shoulder of the second cheek and maintained by fixing means, and an adjustable magnetic shunt being interposed between the magnetic bridges.
  • the first check is made by two identical elementary parts whose adjoining surfaces constitute a plane passing through the symmetry plane.
  • an elementary part of the first cheek is made by a central annulus and a peripheral annulus concentrically placed, and connected together by radial magnetic bridges adjacent the symmetry plane.
  • the magnetic shunt comprises a steel core, interposed between the magnetic bridges and having the axis thereof disposed in the symmetry plane, and means for adjusting the core perpendicularly to the plane ofthe first cheek.
  • the spindle of the mobile assembly is placed between an extension of a structure and the center of the second cheek.
  • FIG. I diagrammatically shows in elevation a section of the device of the invention taken on line I-I of FIG. 2.
  • FIG. 2 is a plan-section taken on line II-II of FIG. 1.
  • FIG. 3 is a plan-section of one element taken on line III-Ill of FIG. I.
  • the device of the invention is described in the following:
  • a magnetic circuit 1 (FIG. 1) comprises a permanent annular magnet 2, a first check 3 and a second cheek 4.
  • the magnet 2 and the first cheek 3 are centered on a cylindrical body 5 of a structure 6, an inner shoulder 7 of which centers also the cup shaped recess 8 formed in the second cheek 4.
  • a mobile assembly is carried by a spindle 9 which is pivotally mounted between two step-bearings 10 and 11, the first bearing being housed in an extension 12 of the structure 6, the second bearing being placed in the center of the recess 8 of the second cheek 4.
  • the mobile assembly 40 comprises a coil 13 wound on a yoke 13a which is keyed on said spindle 9, a needle 14 being also carried by the yoke 13a and an balancing plate 15 as well as spiral springs 16 and 17.
  • the coil 13 surrounds the radial section 20 of the central annulus 23 or 23' FIG. 2) of the first cheek 3 and may rotate at least 250 together with the spindle 9, thereby causing a rotation of the same amplitude of the needle 14 in front of a dial 14a and providing a device with a wide scale range.
  • FIG. 2 shows the first cheek 3 and the magnet 2 which is ring-shaped and of the same diameter as said check 3 (the magnet 2 is shown limited by a dash line). Both the magnet and cheek 3 are centered on the cylindrical body 5 of the structure 6.
  • the assembly of the structure 6, the magnet 2, the first cheek 3, on the one hand, and the second cheek 4, on the other hand, is made by means of screws 18, 19.
  • FIG. 3 shows an embodiment of the first cheek 3 which is made by joining two identical elements 21, 21, each comprising a peripheral half annular rim 22, 22 and a central half annular rim 23, 23', which are connected together by means of magnetic bridges, respectively 24 and 24.
  • junction of the elements 21, 21' is made by adjoining surfaces such as 31, 32, 33, 34 and 31', 32', 33, 34'.
  • Said adjoining surfaces determine a joint plane like a plane of symmetry passing through the axis yy' (FIG. 3) and by the center 0 of the cheek 3 (FIG. 3), i.e. passing through the spindle 9 of the mobile assembly of the indicating device.
  • a magnetic shunt for accurate loading of the device is placed in the first cheek 3 between the bridges 24, 24' in an aperture that they define.
  • This shunt is made by a steel core 27 which may be displaced perpendicularly to the plane of the first check 3 by means of a screw 28 (FIG. I) mounted in order to freely turn in a hole provided on the second cheek 4.
  • a return spring 29 is placed between a shoulder 30 of the screw 28 and the bottom of the core 27 which is prevented from turning because of the polygonal shape of said core 27. It is thus possible to have access to the screw 28 from the bottom of the second cheek 4 constituting the rear face of'the device.
  • the core 27 is advantageously triangular in section so as to be perfectly adapted to the arrangement of the magnetic bridges 24, 24'.
  • a difierent section-shape of the core 27 would not alter the scope of the invention.
  • the indicating device of the invention one has only to introduce a central half annular rim 23 or 23' in the frame 13a, and then to connect the elements 21, 21' by their adjoining surfaces 30 to 33 and 30' to 33' in order to form the first cheek 3 which one may then place on the cylindrical body 5 and look by the tumed-down edge 35 of the structure 6.
  • the magnet 2 is then placed on the cylindrical body 5. against the first cheek 3.
  • the mounting is then secured to the second cheek 4 centered on the shoulder 7 of the structure 6, with known fixing means, for example with screws I8, 19.
  • the mounting of the mobile assembly between the step-bearings 10 and 11 of the spindle 9 is then a conventional operation which may be done in various known ways.
  • the disassembly is made inversely and quite easily.
  • a magnetoelectric indicating device having a wide range comprising a magnetic circuit assembly and a mobile assembly mounted therein to be responsive thereto, said magnetic assembly comprising an annular permanent magnet, a first circular cheek member and a second circular cheek member engaging opposite faces of the magnet for retaining said magnet between the peripheral portions thereof, said first cheek member being formed as two radially spaced concentric annuluses having two magnetic bridges adjoining them and being divided across a diameter between the two bridges and said mobile assembly comprising a spindle passing through the center of the inner concentric annulus of said first cheek member, an indicator connected to said spindle, a coil surrounding the inner concentric annulus of the first cheek member and connected to said spindle, means for rotatably supporting said spindle to rotate as said coil moves about the axis thereof in response to magnetic flux, said annular magnet being removably secured between the outer annulus of the first cheek member and the second cheek member and an adjustable magnetic shunt interposed between the magnetic bridges.
  • a magnetoelectric indicating device as claimed in claim 1 wherein the divided portions of said first cheek member across a diameter thereof are reciprocals of each other and the surfaces when adjoined are in magnetic contact.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
US44518A 1969-06-13 1970-06-08 Magnetoelectric indicating device with a great scale range Expired - Lifetime US3611222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6919635A FR2049558A5 (enrdf_load_stackoverflow) 1969-06-13 1969-06-13

Publications (1)

Publication Number Publication Date
US3611222A true US3611222A (en) 1971-10-05

Family

ID=9035666

Family Applications (1)

Application Number Title Priority Date Filing Date
US44518A Expired - Lifetime US3611222A (en) 1969-06-13 1970-06-08 Magnetoelectric indicating device with a great scale range

Country Status (4)

Country Link
US (1) US3611222A (enrdf_load_stackoverflow)
DE (1) DE2028680A1 (enrdf_load_stackoverflow)
FR (1) FR2049558A5 (enrdf_load_stackoverflow)
GB (1) GB1298127A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251771A (en) * 1978-10-02 1981-02-17 General Electric Company Magnetic system for electrical current indicating meter
US4443724A (en) * 1982-02-19 1984-04-17 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Shaft transducer having DC output proportional to angular velocity
US4639624A (en) * 1984-07-27 1987-01-27 Hitachi, Ltd. Torque motor having a coil with finite turning range
US20070221118A1 (en) * 2006-02-20 2007-09-27 Shigeki Yagi Indicator
CN107356788A (zh) * 2017-07-06 2017-11-17 国网山东省电力公司电力科学研究院 用于大电流元件测试的自动加载装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740756C (de) * 1936-05-30 1943-10-28 Schaeffer & Budenberg G M B H Drehspulmessgeraet mit unipolarem Magnetsystem
US2657374A (en) * 1949-11-02 1953-10-27 Gulf Research Development Co Suspension system for seismograph detectors

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740756C (de) * 1936-05-30 1943-10-28 Schaeffer & Budenberg G M B H Drehspulmessgeraet mit unipolarem Magnetsystem
US2657374A (en) * 1949-11-02 1953-10-27 Gulf Research Development Co Suspension system for seismograph detectors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
1068361 11-27-57 German Application, Hofmann Class 324 Subclass 151 1 Sht-Dwg, 2 pp. Spec. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251771A (en) * 1978-10-02 1981-02-17 General Electric Company Magnetic system for electrical current indicating meter
US4443724A (en) * 1982-02-19 1984-04-17 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Shaft transducer having DC output proportional to angular velocity
US4639624A (en) * 1984-07-27 1987-01-27 Hitachi, Ltd. Torque motor having a coil with finite turning range
US20070221118A1 (en) * 2006-02-20 2007-09-27 Shigeki Yagi Indicator
US7654220B2 (en) * 2006-02-20 2010-02-02 Seiko Instruments Inc. Indicator
CN107356788A (zh) * 2017-07-06 2017-11-17 国网山东省电力公司电力科学研究院 用于大电流元件测试的自动加载装置
CN107356788B (zh) * 2017-07-06 2020-08-14 国网山东省电力公司电力科学研究院 用于大电流元件测试的自动加载装置

Also Published As

Publication number Publication date
DE2028680A1 (enrdf_load_stackoverflow) 1970-12-17
GB1298127A (en) 1972-11-29
FR2049558A5 (enrdf_load_stackoverflow) 1971-03-26

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