GB1416940A - Magnetic field-sensing apparatus - Google Patents

Magnetic field-sensing apparatus

Info

Publication number
GB1416940A
GB1416940A GB3966673A GB3966673A GB1416940A GB 1416940 A GB1416940 A GB 1416940A GB 3966673 A GB3966673 A GB 3966673A GB 3966673 A GB3966673 A GB 3966673A GB 1416940 A GB1416940 A GB 1416940A
Authority
GB
United Kingdom
Prior art keywords
magnet
magneto
devices
magnetic flux
resistive members
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
Application number
GB3966673A
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
Original Assignee
Siemens AG
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
Priority claimed from DE19722241074 external-priority patent/DE2241074C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1416940A publication Critical patent/GB1416940A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Abstract

1416940 Magnetic position indicators SIEMENS A G 21 Aug 1973 [21 Aug 1972] 39666/73 Addition to 1329627 Heading G1N Apparatus for use in such devices as position indicators, limit value signallers or null indicators of the type which includes two magnetic field sensors and a magnetic flux generator movable relative thereto as shown in Specification 1329627 has the magneto-resistors connected in a differential circuit. Position indicator, Fig. 1 Two magnetic field sensing devices 2, 4 including permanent magnets 10, 11 flux return paths 13, 15, 17 and 12, 14, 16 and magneto resistive members 18, 19 are separated by a gap 5 filled with diamagnetic material such as air. A magnetic flux generator in the form of a permanent bar magnet 6 is mounted on the apparatus whose position is to be indicated e.g. a rotatably movable member so that it moves past the devices 2, 4 in the direction of arrow 8. The magneto-resistive members are connected in adjacent arms of a D.C. energized resistance bridge. As the bar magnet 6 moves either to the left or right of the position shown the magnetic flux in one of the magnetoresistive members varies whilst the net flux in the other member remains more or less constant. Thus the output voltage across a bridge diagonal varies positively and negatively linearly with the displacement of the magnet 6 over a limited range, Fig. 3 (not shown) and is insensitive to variation in the distance "b" between the magnet and field sensing devices. Limit value signaller, Fig. 6 The arrangement of Fig. 1 is modified by the magneto-resistive members being remote from each other. When magnet 6 is displaced from the central position there is little variation in the resultant magnetic flux passing through the magneto-resistive members and the bridge output remains zero. Beyond a certain range of movement (dead zone) a positive output maximum is produced (movement to the left) or a negative output minimum (movement to the right). Another arrangement having a "dead zone" comprises two sensing devices as shown in Fig. 1 but the magnet 6 is in the form of a U-shaped magnet whose respective pole limbs extend towards the devices respectively.
GB3966673A 1972-08-21 1973-08-21 Magnetic field-sensing apparatus Expired GB1416940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722241074 DE2241074C3 (en) 1972-08-21 Magnetic field-dependent resistor arrangement for detecting the size and direction of an external magnetic control field

Publications (1)

Publication Number Publication Date
GB1416940A true GB1416940A (en) 1975-12-10

Family

ID=5854128

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3966673A Expired GB1416940A (en) 1972-08-21 1973-08-21 Magnetic field-sensing apparatus

Country Status (3)

Country Link
FR (1) FR2197213B2 (en)
GB (1) GB1416940A (en)
IT (1) IT1046703B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290044A (en) 1978-06-23 1981-09-15 Hiroshi Ishikawa Vehicle level detector
GB2286049A (en) * 1993-12-08 1995-08-02 Festo Kg A sensor device responsive to the position of a piston
GB2314418A (en) * 1996-06-19 1997-12-24 Flying Null Ltd Sensing the presence of a magnetic tag
US5793200A (en) * 1992-10-29 1998-08-11 Rolls-Royce And Associates Limited Position responsive magnetic sensing elements for sensing the position of a member at a remote site
EP1300649A1 (en) * 2000-08-04 2003-04-09 Matsushita Electric Industrial Co., Ltd. Position sensor for electromagnetic actuator
EP3273202A1 (en) * 2016-07-20 2018-01-24 Melexis Technologies SA Displacement detection device
EP3273203A1 (en) * 2016-07-20 2018-01-24 Melexis Technologies SA Displacement detection device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989010540A1 (en) * 1988-04-20 1989-11-02 Honeywell Inc. Shaping output of magnetic sensor with magnets
FR2953286B1 (en) 2009-11-27 2012-06-22 Electricfil Automotive METHOD AND MAGNETIC MEASURING SENSOR FOR NON-CONTACT DETECTION OF MOVEMENTS

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290044A (en) 1978-06-23 1981-09-15 Hiroshi Ishikawa Vehicle level detector
US5793200A (en) * 1992-10-29 1998-08-11 Rolls-Royce And Associates Limited Position responsive magnetic sensing elements for sensing the position of a member at a remote site
GB2286049A (en) * 1993-12-08 1995-08-02 Festo Kg A sensor device responsive to the position of a piston
GB2286049B (en) * 1993-12-08 1997-10-08 Festo Kg A sensor device responsive to the position of a piston
GB2314418A (en) * 1996-06-19 1997-12-24 Flying Null Ltd Sensing the presence of a magnetic tag
GB2314418B (en) * 1996-06-19 1999-07-07 Flying Null Ltd Magnetic sensing and reading devices
EP1300649A1 (en) * 2000-08-04 2003-04-09 Matsushita Electric Industrial Co., Ltd. Position sensor for electromagnetic actuator
EP1300649A4 (en) * 2000-08-04 2003-09-17 Matsushita Electric Ind Co Ltd Position sensor for electromagnetic actuator
US6690158B2 (en) 2000-08-04 2004-02-10 Matsushita Electric Industrial Co., Ltd. Position sensor for electromagnetic actuator to detect a position of a shaft
EP3273202A1 (en) * 2016-07-20 2018-01-24 Melexis Technologies SA Displacement detection device
EP3273203A1 (en) * 2016-07-20 2018-01-24 Melexis Technologies SA Displacement detection device
US10352682B2 (en) 2016-07-20 2019-07-16 Melexis Technologies Sa Displacement detection device
US10900811B2 (en) 2016-07-20 2021-01-26 Melexis Technologies Sa Displacement detection device

Also Published As

Publication number Publication date
DE2241074A1 (en) 1974-03-14
FR2197213B2 (en) 1982-09-17
DE2241074B2 (en) 1975-12-04
FR2197213A2 (en) 1974-03-22
IT1046703B (en) 1980-07-31

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee