EP0205754A2 - Noyau ferromagnétique pour capteur de position inductif - Google Patents

Noyau ferromagnétique pour capteur de position inductif Download PDF

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Publication number
EP0205754A2
EP0205754A2 EP86102795A EP86102795A EP0205754A2 EP 0205754 A2 EP0205754 A2 EP 0205754A2 EP 86102795 A EP86102795 A EP 86102795A EP 86102795 A EP86102795 A EP 86102795A EP 0205754 A2 EP0205754 A2 EP 0205754A2
Authority
EP
European Patent Office
Prior art keywords
core
core according
sleeve
diameter
sheet
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.)
Withdrawn
Application number
EP86102795A
Other languages
German (de)
English (en)
Other versions
EP0205754A3 (fr
Inventor
Herbert Veh
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.)
ETO Gruppe Technologies GmbH
Original Assignee
Elektroteile GmbH Oberuhldingen
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 Elektroteile GmbH Oberuhldingen filed Critical Elektroteile GmbH Oberuhldingen
Publication of EP0205754A2 publication Critical patent/EP0205754A2/fr
Publication of EP0205754A3 publication Critical patent/EP0205754A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/08—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
    • H01F29/10—Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable part of magnetic circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps

Definitions

  • the invention relates to a core made of ferromagnetic material for inductive displacement sensors.
  • Such position sensors have proven themselves to a great extent in the measurement and evaluation of the smallest distances, but also longer distances. They allow a direct measurement of paths and derived from them, also the measurement of other physical quantities that can be traced back to length measurements, such as force and acceleration.
  • differential transformers or differential chokes have proven themselves as inductive displacement transducers, but also as position switches.
  • the core of such known displacement transducers is very closely coupled to the coil system in those applications in which little or no pressure resistance requirements are required, i.e. the air gap between the core and the coil body is approximately 0.5-1 mm, the core diameter being 5-7 mm.
  • a non-magnetic pressure pipe must be attached between the core and the coil system.
  • the practical pressure pipe diameters are 6 -7 mm with a wall thickness of approx. 1 mm. This limits the core diameter that can be used to approx. 3-4 mm.
  • the core of known differential transformers consists of a highly permeable, specially treated material, for example made of "Mumetall” or of a trained ferrite core which is difficult to machine.
  • This core is designed as a solid cylinder and changes the coupling between the primary coil and the two secondary coils in the opposite direction during its axial displacement.
  • These cores are usually connected to a guide rod made of non-magnetic material by means of an adhesive connection or a threaded connection. To do this, either an extension must be screwed onto the guide rod to match the inner diameter of the core bore, or a thread must also be cut to match the core thread.
  • the guide rod e.g. the extension of an actuator e.g. Solenoid or valve
  • the starting position of the actuator is assigned to a specific output voltage of the displacement sensor with respect to a position of the flange.
  • This position-voltage assignment can fluctuate considerably due to mechanical tolerances in the design of the actuator (solenoid, valve).
  • By moving the soft iron core to a fixed dimension with respect to the corresponding flange position these tolerances could be compensated.
  • a threaded connection this can be done by twisting the core and then fixing it with a lock nut or locking lacquer, whereas with an adhesive connection this effort is quite considerable, since fixing is necessary until the adhesive has hardened. In most cases it is no longer possible to loosen the core.
  • ferrite cores with suitable dimensions can only be supplied to a limited extent; in the case of special designs, only with very large quantities, whereby longer cores have to be composed of individual cores.
  • larger tolerances in the magnetic properties of the overall core must be accepted.
  • the invention has for its object to provide a ferromagnetic core for position transducers, in particular for differential transformers, differential chokes and for position switches, which provides reproducible output values without mechanical processing and final annealing, allows attachment with a guide rod without additional mechanical processing of the guide rod, and easy displacement allowed to compensate for length tolerances.
  • the core designed according to the invention consists of a wound electrical steel sheet made of dynamo sheet.
  • the strip sections used for this purpose only require deburring of all edges and the production can be carried out with high reproducibility of the electromagnetic material properties, since no further mechanical processing is required.
  • the winding core is dimensioned so that the sheet can still spring open a little while forming the slot, and this manufacture results in high accuracies with regard to the dimensional accuracy of the electrical sheet, without additional processing.
  • the invention has the advantage that a very large number of different types of electrical sheet are available, so that the core material is cheaper and easier to obtain.
  • the slot will generally be arranged to run along a surface line.
  • the finished core 10 consists of a sleeve-like body 12 with a slot 16 extending along a surface line.
  • the slotted sleeve 12 is expediently wound in parallel from a sheet-metal strip section 14 on a multi-core mandrel, the outside diameter of which is somewhat smaller than the inside diameter of the finished core, which is determined according to the Winding up slightly springs open.
  • the core does not require any mechanical processing. It is only a requirement that all edges of the sheet metal strip section 14 are free of degrees.
  • the sleeve 10 can be clamped onto an actuating rod, not shown, made of non-ferromagnetic material, which as an actuator e.g. serves for a solenoid valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Magnetically Actuated Valves (AREA)
EP86102795A 1985-03-04 1986-03-04 Noyau ferromagnétique pour capteur de position inductif Withdrawn EP0205754A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3507585 1985-03-04
DE19853507585 DE3507585A1 (de) 1985-03-04 1985-03-04 Kern aus ferromagnetischem material, insbesondere fuer induktive wegaufnehmer

Publications (2)

Publication Number Publication Date
EP0205754A2 true EP0205754A2 (fr) 1986-12-30
EP0205754A3 EP0205754A3 (fr) 1988-09-07

Family

ID=6264139

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102795A Withdrawn EP0205754A3 (fr) 1985-03-04 1986-03-04 Noyau ferromagnétique pour capteur de position inductif

Country Status (2)

Country Link
EP (1) EP0205754A3 (fr)
DE (1) DE3507585A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3471114A1 (fr) * 2017-10-14 2019-04-17 Hamilton Sundstrand Corporation Noyau lvdt formé d'une feuille métallique
WO2019094529A1 (fr) * 2017-11-10 2019-05-16 Honeywell International Inc. Noyau cylindrique en forme de c pour sondes à transformateur différentiel variable linéaire (lvdt)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904448A1 (de) * 1989-02-15 1990-08-16 Bosch Gmbh Robert Magnetanker
SE541400C2 (en) 2017-02-27 2019-09-17 Sem Ab Inductive position sensor with improved plunger core design

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2427866A (en) * 1944-04-25 1947-09-23 Baldwin Locomotive Works Electromagnetic motion responsive device
US3262027A (en) * 1964-04-06 1966-07-19 Automatic Switch Co Solenoid structure and mounting means therefor
US3947788A (en) * 1974-09-03 1976-03-30 Spencer C. Schantz Solenoid
IT1108522B (it) * 1978-12-19 1985-12-09 Sandretto Spa Apparecchio per rilevare la posizione di un organo mobile rispetto a un corpo di supporto fisso
GB2133932A (en) * 1982-12-31 1984-08-01 Int Research & Dev Co Ltd Improvements to strip wound magnetic cores

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3471114A1 (fr) * 2017-10-14 2019-04-17 Hamilton Sundstrand Corporation Noyau lvdt formé d'une feuille métallique
WO2019094529A1 (fr) * 2017-11-10 2019-05-16 Honeywell International Inc. Noyau cylindrique en forme de c pour sondes à transformateur différentiel variable linéaire (lvdt)
US10996078B2 (en) 2017-11-10 2021-05-04 Honeywell International Inc. C-shaped cylindrical core for linear variable differential transformer (LVDT) probes
EP4235708A3 (fr) * 2017-11-10 2023-09-06 Honeywell International Inc. Noyau cylindrique en forme de c pour sondes à transformateur différentiel variable linéaire (lvdt)

Also Published As

Publication number Publication date
EP0205754A3 (fr) 1988-09-07
DE3507585A1 (de) 1986-09-04

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Inventor name: VEH, HERBERT