US3676819A - Contact-free potentiometer - Google Patents

Contact-free potentiometer Download PDF

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Publication number
US3676819A
US3676819A US884167A US3676819DA US3676819A US 3676819 A US3676819 A US 3676819A US 884167 A US884167 A US 884167A US 3676819D A US3676819D A US 3676819DA US 3676819 A US3676819 A US 3676819A
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US
United States
Prior art keywords
magnet
potentiometer
contact
free
cover
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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
Application number
US884167A
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English (en)
Inventor
Werner Keller
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.)
Siemens AG
Siemens Corp
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Siemens Corp
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Publication date
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Publication of US3676819A publication Critical patent/US3676819A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N50/00—Galvanomagnetic devices
    • H10N50/10—Magnetoresistive devices

Definitions

  • CONTACT-FREE POTENTIOMETER 72 Inventor: Werner Keller, Olching, Germany [73] Assignee: Siemens Aktiengesellschalt, Berlin and Kunststoff, Germany [22] Filed: Dec. 11, 1969 [21] Appl. No.: 884,167
  • the invention relates to a potentiometer. More particularly, the invention relates to a contact-free potentiometer.
  • the contact-free potentiometer of the invention comprises a permanent magnet which may be removed across a stationary armature body, and a galvanomagnetic resistor or field plate.
  • Field plates are bodies having electrical resistance which may be magnetically controlled.
  • the principal object of the invention is to provide a new and improved contact-free potentiometer.
  • An object of the invention is to provide a contact-free potentiometer which includes a field plate adjustable to provide a desired resistance magnitude which may be reproduced at any time.
  • An object of the invention is to provide a contactfree potentiometer having a resistance magnitude which, once adjusted, may be maintained without variation for a long period of time.
  • An object of the invention is to provide a contact-free potentiometer having a resistance magnitude which, once adjusted, may be maintained without variation for more than fifteen years.
  • An object of the invention is to provide a contact-free potentiometer which is sealed dust tight and is shielded against outside magnetic fields.
  • An object of the invention is to provide a contact-free potentiometer which is almost completely insensitive to production tolerances.
  • An object of the invention is to provide a contact-free potentiometer in which a layer of non-magnetic material interposed between the armature body and the magnet creates a space between said armature body and said magnet, which remains constant in each position of the magnet, thereby preventing the accumulation of foreign bodies between said armature body and said magnet, so that the potentiometer remains almost completely insensitive to production tolerances.
  • An object of the invention is to provide a contact-free potentiometer which functions with efficiency, effectiveness and reliability.
  • a contact-free adjustable semiconductor potentiometer has a plate-shaped galvanomagnetic semiconductor resistor whose resistance may be determined by shifting a magnetic field in operative proximity therewith.
  • the magnetic field is produced by a magnetic circuit having a permanent magnet and a stationary elongated armature.
  • the potentiometer comprises a guide plate of nonmagnetic material interposed between the magnet and the armature body.
  • the guide plate has a recess formed therein and the galvanomagnetic resistor is embedded in the recess. The guide plate guides the magnet in gliding relation.
  • the guide plate comprises a U-shaped frame aflixed to the armature body and forming a tunnel-like housing therewith enclosing the area of the magnet.
  • the guide plate comprises a brass sheet and is cemented to the armature body.
  • the magnet comprises a permanently magnetic cylindrical rod having a pair of wafer-like poleshoes.
  • the guide plate further comprises a spring bolt mounted between the magnet and abutting against the frame.
  • the guide plate further comprises a spiral spring in the area enclosed by the frame and abutting an axial end of the magnet whereby the magnet is movable relative to the spiral spring.
  • a container of substantially hollow cylindrical configuration has a closed bottom base and an open top base and encloses the potentiometer with the spiral spring adjacent the bottom.
  • a cover of substantially hollow cylindrical configuration has an open bottom base and a closed top base and is adapted to engage the container in a threadlike manner as a micrometer screw.
  • the guide plate further comprises a spherical member mounted on the opposite axial end of the magnet between the magnet and the cover and abutting the magnet and the cover.
  • the container has a groove formed therein and the cover has at least one bolt engaging the groove.
  • the cover has a border area on its cylindrical surface.
  • the cover has a recess formed in its top surface adapted to receive an adjusting tool.
  • the cover has a ring shiftably mounted on its cylindrical surface and having a scale division thereon.
  • FIG. 1 is a view, partly in section, of an embodiment of the contact-free potentiometer of the invention
  • FIG. 2 is a side view of the enclosed contact-free potentiometer of the invention.
  • FIG. 3 is a top view of the embodiment of FIGS. 1 and 2, with the cover removed;
  • FIGS. 4 and 4a illustrate the two extreme positions of the magnet and armature body relative to each other.
  • FIGS. 5 and 5a are two views of the layer of non-magnetic material illustrating the position of the galvanomagnetic resistor.
  • an armature body 4 is formed of a non-ferrous, substantially planar, iron rod.
  • the armature body 4 is aflixed to a U-shaped metal frame 8 and defines with said frame a housing which encloses the area of a magnet l, 2, 3.
  • the magnet l, 2, 3 is a permanent magnet mounted for movement in axial directions alongside the armature body 4 within the housing formed by said armature body and the U- shaped frame 8.
  • the magnet comprises a permanently mag netic cylindrical rod 1 having a first wafer-like poleshoe 2 at the upper end thereof and a second wafer-like poleshoe 3 at the lower end thereof.
  • a spring bolt or buckle 9 is affixed to the poleshoes 2 and 3 of the magnet 1, 2, 3 and abuts the inside surface of the U- shaped frame 8.
  • the spring bolt 9 thereby urges the magnet 1, 2, 3, in addition to the magnetic force at the areas of the poleshoes 2 and 3 of said magnet, against a layer of non-magnetic material 5.
  • the layer of non-magnetic material 5 is interposed between the annature body 4 and the magnet l, 2, 3 and comprises a thin brass sheet cemented to said armature body.
  • a recess 6 (FIGS. 5 and 5a) is formed through the layer 5 of non-magnetic material.
  • a galvanomagnetic resistor or field plate 7 (FIGS. 4 and 4a and 5 and 5a) is embedded in the recess 6 formed in the layer 5 of non-magnetic material.
  • the magnet l, 2, 3 and the metal frame 8 are housed in a steel container 13 of substantially hollow cylindrical configuration having a closed bottom base and an open top base.
  • the magnet l, 2, 3 is movable in the container 13 in axial directions thereof and in gliding relation on the non-magnetic layer 5.
  • the magnet l, 2, 3 is thus movable between a position in which it is at a minimum or maximum distance from the galvanomagnetic resistor 7 positioned in the recess 6 of the nonmagnetic layer 5 and the maximum or minimum distance from said galvanomagnetic resistor.
  • a spiral spring 14 is positioned around the lower end of the magnet l, 2, 3 between the second poleshoe 3 of said magnet and the inside surface of the container 13 and abuts said poleshoe and said container.
  • a steel cover 10 covers and seals the container 13.
  • the cover 10 is of substantially hollow cylindrical configuration having an open bottom base and a closed top base and adapted to engage the container 13 in a threadlike manner as a micrometer screw.
  • the edge of the cover 10 which partly surrounds the container 13 is joined by bolts with said container.
  • the housing provided by the container 13 and the cover 10 provides, without additional measures, and in an advantageous manner, a dusttight sealing of the potentiometer and complete protection against interfering magnetic fields.
  • the rotating movement of the cover is translated into an axial movement of the magnet 1, 2, 3 via the spherical member 1 1.
  • a specific threading pitch between the container 13 and the cover 10 is selected to enable the adjustment and setting of the potentiometer at a desired precision, without the requirement for additional measures such as, for example, gears.
  • the rotation of the cover 10 is limited by bolts 12 provided in the engaging edge of the cover 10 and functioning as stops for engaging a groove 25 formed in the container 13.
  • the bolts 12 also prevent the housing from being unintentionally disturbed by preventing the cover 10 from being unintentionally removed from the container 13.
  • the tightening of at least one bolt at the surface of the container may prevent an adjusted resistance value from undesired variation.
  • the magnet 1, 2, 3 is positioned at a maximum and a minimum distance from the galvanomagnetic resistor 7 positioned in the recess 6 of the non-magnetic layer 5.
  • the maximum position of the cover 10 is illustrated by broken lines in FIG. 2.
  • FIGS. and 4a illustrates the minimum position in which the magnet 1, 2, 3 is a minimum distance from the galvanomagnetic resistor 7.
  • the second poleshoe 3 of the magnet l, 2, 3 covers the field plate 7 completely, so that said field plate is subjected to a maximum flux.
  • the right-hand view of FIGS. 4 and 4a illustrates the maximum position in which the magnet l, 2, 3 is a maximum distance from the galvanomagnetic resistor 7 positioned in the recess 6 of the non-magnetic layer 5.
  • the second poleshoe 3 is a maximum distance from the field plate 7, so that the magnetic flux to which said field plate is subjected is almost zero.
  • the play or clearance in the threading between the container l3 and the cover 10 of the housing of the potentiometer of the invention is canceled out or compensated for in a preferred manner by the spiral spring 14.
  • the setting or reading of a specific resistance value is provided with the assistance of two scale marks and 16 provided on the outside of the potentiometer housing in the same manner as for a micrometer screw.
  • One scale mark 15 is positioned on a ring 17 around the cylindrical surface of the cover 10 and may be shifted thereon. The distance between the scale marks may be selected in a manner whereby any desired exact adjustment may be effected for desired resistance values. After adjustment, the ring 17 may be cemented to the cover 10.
  • Electrically conductive leads 18 extend from the potentiometer housing, through the bottom of the container 13 thereof, to the outside.
  • a winding 19 is positioned around the permanent magnet rod 1 in order to adjust the magnetic field.
  • the two ends of the winding 19 are connected to electrically conductive leads which extend from the potentiometer housing through the bottom of the container 13 thereof via electrical contacts 21.
  • One of the leads 20 from one of the ends of the winding 19 is shown in FIG. 3.
  • the bottom of the container 13, as shown in FIG. 3, is provided with bolts or screws 22, 23 and 24 for fixing the various components of the potentiometer of the invention in position in the potentiometer housing.
  • a contact-free, adjustable semiconductor potentiometer having a plate-shaped, galvanomagnetic semiconductor resistor whose resistance may be determined by shifting a magnetic field in operative proximity therewith, the magnetic field being produced by a magnetic circuit having a permanent magnet and a stationary elongated armature body, said potentiometer comprising a guide plate of non-magnetic material interposed between the magnet and the armature body of the magnetic circuit, said guide plate being adjacent to the armature body and having a recess formed therein and said galvanomagnetic resistor being embedded in said recess, said guide plate guiding the magnet in gliding relation.
  • a contact-free potentiometer as claimed in claim 2 further comprising a spiral spring in the area enclosed by said frame and abutting an axial end of said magnet whereby the magnet is movable relative to the spiral spring.

Landscapes

  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Adjustable Resistors (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
US884167A 1968-12-17 1969-12-11 Contact-free potentiometer Expired - Lifetime US3676819A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1815160A DE1815160B2 (de) 1968-12-17 1968-12-17 Schleifkontaktfreies Potentiometer

Publications (1)

Publication Number Publication Date
US3676819A true US3676819A (en) 1972-07-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
US884167A Expired - Lifetime US3676819A (en) 1968-12-17 1969-12-11 Contact-free potentiometer

Country Status (8)

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US (1) US3676819A (enrdf_load_stackoverflow)
AT (1) AT295662B (enrdf_load_stackoverflow)
CH (1) CH510322A (enrdf_load_stackoverflow)
DE (1) DE1815160B2 (enrdf_load_stackoverflow)
FR (1) FR2026334A1 (enrdf_load_stackoverflow)
GB (1) GB1225890A (enrdf_load_stackoverflow)
NL (1) NL6918264A (enrdf_load_stackoverflow)
SE (1) SE345545B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848216A (en) * 1973-10-09 1974-11-12 J Gamble Solid state keyboard switch
US4107604A (en) * 1976-12-01 1978-08-15 Compunetics, Incorporated Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device
US4673876A (en) * 1984-03-08 1987-06-16 General Scanning, Inc. Two-element angular positive sensor for rotatable shaft

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752434A (en) * 1949-10-19 1956-06-26 Gen Electric Magneto-responsive device
US3359522A (en) * 1967-12-19 Contact-free rotary resistor arrangement
US3366908A (en) * 1965-05-07 1968-01-30 Siemens Ag Contact-free rotary resistor arrangement
GB1185557A (en) * 1966-09-24 1970-03-25 Finsterhoelzl Rafi Elekt Contactless Electronic Switching Devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359522A (en) * 1967-12-19 Contact-free rotary resistor arrangement
US2752434A (en) * 1949-10-19 1956-06-26 Gen Electric Magneto-responsive device
US3366908A (en) * 1965-05-07 1968-01-30 Siemens Ag Contact-free rotary resistor arrangement
GB1185557A (en) * 1966-09-24 1970-03-25 Finsterhoelzl Rafi Elekt Contactless Electronic Switching Devices
US3571774A (en) * 1966-09-24 1971-03-23 Raimund Finsterholzl Elektrote Non-contacting electronic switch gear

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848216A (en) * 1973-10-09 1974-11-12 J Gamble Solid state keyboard switch
US4107604A (en) * 1976-12-01 1978-08-15 Compunetics, Incorporated Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device
US4673876A (en) * 1984-03-08 1987-06-16 General Scanning, Inc. Two-element angular positive sensor for rotatable shaft

Also Published As

Publication number Publication date
DE1815160C3 (enrdf_load_stackoverflow) 1975-04-03
CH510322A (de) 1971-07-15
FR2026334A1 (enrdf_load_stackoverflow) 1970-09-18
GB1225890A (enrdf_load_stackoverflow) 1971-03-24
NL6918264A (enrdf_load_stackoverflow) 1970-06-19
SE345545B (enrdf_load_stackoverflow) 1972-05-29
AT295662B (de) 1972-01-10
DE1815160A1 (de) 1970-06-25
DE1815160B2 (de) 1974-08-08

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