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GB2339915A - Angle-of-rotation sensor - Google Patents

Angle-of-rotation sensor Download PDF

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Publication number
GB2339915A
GB2339915A GB9916687A GB9916687A GB2339915A GB 2339915 A GB2339915 A GB 2339915A GB 9916687 A GB9916687 A GB 9916687A GB 9916687 A GB9916687 A GB 9916687A GB 2339915 A GB2339915 A GB 2339915A
Authority
GB
United Kingdom
Prior art keywords
permanent magnet
angle
flux
rotation
conducting element
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Withdrawn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
GB9916687A
Other versions
GB9916687D0 (en
Inventor
Dieter Schodlbauer
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.)
Ruf Electronics GmbH
Original Assignee
Ruf Electronics GmbH
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 Ruf Electronics GmbH filed Critical Ruf Electronics GmbH
Publication of GB9916687D0 publication Critical patent/GB9916687D0/en
Publication of GB2339915A publication Critical patent/GB2339915A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B1/00—Measuring instruments characterised by the selection of material therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
    • 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
    • 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
    • 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
    • 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
    • G01D5/20—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 by varying inductance, e.g. by a movable armature
    • G01D5/22—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 by varying inductance, e.g. by a movable armature differentially influencing two coils
    • 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
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/40—Position sensors comprising arrangements for concentrating or redirecting magnetic flux

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Description

2339915 Anp,le-of-rotation sensor
The present invention relates to an angle-of-rotation sensor having a permanent magnet fastened on a first flux-conducting element which extends at least over one circular annular segment %,.'Ith re-,pect to an axis of rotation of the angle-of-rotation sensor whereby the north-south direction of the permanent magnet is aligned perpendicular to the axis of rotation of the sensor, a second flux-conducting element extending over a circular annular segment which is rotatable about the axis of rotation relative to the first flux-conducting element. a primary air gap lying between the two flux-conducting elements, the second flux-conducting element having a secondary air gap running radially, in %,k,hjch a magnetic field sensor is arranged.
An angle-of-rotation sensor of this type is known from EP 0 665 416 Al. This angleof-rotation sensor has a cylindrical rotor element connected to an axis of rotation with an annular permanent magnet fastened to its cylindrical inner wall. Furthermore a circular stator element consisting of two halves of a cylinder which is arranged within the annular permanent magnet and separated from it by an annular primary air gap is provided. Between the two halves of the cylinder of the stator element, a secondary air gap is located, in which a Hall probe is disposed. The magnetornotive force of the HaH probe, and the electrical signal generated by it, which corresponds to the associated angle of rotation, changes according to the rotational position of the permanent magnet relative to the stator.
A similar angle-of-rotation sensor is known from US 5,528,139 in which the angle of rotation is also determined by means of an annular magnet which can be rotated with respect to a Hall probe.
2 Furthermore a linear sensor is known from US 5,532,585 in which the longitudinal movement of a bar magnet moving in a primary air gap is sensed by means of a Hall probe which is disposed in a secondary air gap perpendicular to the primary air gap.
The above sensors can, for example, be used in the field of motor vehicles for measurement of the position of the throttle control or the position of the gas pedal. In this case it is desirable that the electrical signal generated by the Hall probe changes as close to linearly as possible, with the rotation or displacement. In many applications it is sufficient if the sensor only operates linearly in a limited range of measurement, for example, from 0' to 60'.
An object of the invention is to provide an angle-of-rotation sensor which is simply constructed and which operates as close to linearly as possible in a predetermined range of angles of rotation and which can be produced cost-effectively.

Claims (12)

The invention provides an angle-of-rotation sensor as claimed in Claim 1. The invention is based on the idea of determining the angle of rotation by using a permanent magnet whose length perpendicular to the north-south direction of the magnet and perpendicular to the axis of rotation of the angle-of-rotation sensor is smaller than the circumference of a primary air gap. Such a permanent magnet is, for example, in the form of a cube, a cylindrical section or an annular segment. The primary air gap is formed by a first flux-conducting element, to which the permanent magnet is fastened and by a second flux-conducting element arranged some distance away from the first flux-conducting element. The permanent magnet is arranged so that it can rotate freely in relation to the second flux-conducting element and is magnetized so that the north-south direction of the magnet is perpendicular to the axis of rotation. Viewed in the direction of the axis of rotation, the first fluxconducting element and the second flux-conducting element extend at least over one annular segment. The second flux-conducting element has a secondary radially 3 extending air gap in which a magnetic field sensor, such as a Hall probe, is disposed. The magnetic field sensor senses the strength of the magnetic field generated by the permanent magnet and generates an electric signal corresponding to the rotational position of the magnet. The two flux-conducting elements are made of a ferromagnetic material, so that the magnetic field is amplified or concentrated. According to a ftu-ther embodiment of the invention, one of the two fluxconducting elements is in the form of a bipartite slotted cylinder. The other flux-conducting element is formed as a hollow cylinder, which has at least one radial air gap through which the secondary air gap is formed, surrounding the bipartite slotted cylinder. The permanent magnet may be formed and arranged in several different ways. For example, one of the two flux-conducting elements can have a slot running parallel to the axis of rotation, into which the permanent magnet is introduced. The permanent magnet or the slot can be arranged centrally relative to one flux-conducting element; that is, lie in the axis of rotation. Alternatively, the permanent magnet can be arranged eccentrically, or outside of the flux-conducting element, directly facing the primary air gap. If the permanent magnet is fastened outside of the flux-conducting element it can have, for example, a cross section in the form of an annular segment. However, a cubic shape or a circular disk is also possible. The invention will now be described with reference to the embodiments shown in the accompanying drawings, in which: Figure I shows a cross-sectional view of an angle-of-rotation sensor in which the permanent magnet lies in the axis of rotation, Figures l a and lb show cross-sectional views of the angle-of-rotation sensor of Figure I in various rotational positions, 4 Figure 2 shows a cross-sectional view of an angle-of-rotation sensor in which the permanent magnet is disposed eccentrically, Figure 3 shows a cross-sectional view of an angle-of-rotation sensor in which the permanent magnet is disposed outside of the flux-conducting element, Figure 4 shows a cross-sectional view of an angle-of-rotation sensor in which the permanent magnet projects directly into the primary air gap, and Figure 5 shows a cross -sectional view of an angle-of-rotation sensor in which the fluxconducting element as well as the permanent magnet are structured in the form of an annular segment. Figure I sho-ws a section through an angle-of-rotation sensor 1 with an axis of rotation I a perpendicular to the plane of the drawing. The angleof-rotation sensor 1 has a permanent magnet 2 which is represented here as a cuboid and which is arranged in a slot-like recess ') of a first cylindrical flux-conducting element 4. The magnetic field generated by the permanent magnet 2 is indicated by the dotted magnetic field lines 5, the magnetization being such that the north-south direction of the magnet, nins perpendicular to the axis of rotation 1 a. The north-south direction is represented by a double arrow 5a. The cylindrical first flux-conducting element 4 is encircled by a sleevelike second fluxconducting element 6 which is formed by two halfcylinders 7a and 7b, The halfcylinders 7a and 7b have an inner diameter DI which is greater than the outer diameter D2 of the first flux- conducting element 4, resulting in an annular primary air gap 8 lying between the two flux-conducting elements 4 and 6. The two half-cylinders 7a and 7b are arranged at a distance S I from one another, so that two opposing secondary air gaps 9 and 10 are formed. A magnetic field sensor 11, such as a Hall probe, is arranged in the secondary air gap 9. It is characteristic for the angle-of rotation sensor shown that the length Ll of the permanent magnet 2, measured in a direction perpendicular to the north-south direction of the magnet and perpendicular to the axis of rotation I a, is smaller than the circumference of the annular primary air gap 8. If a permanent magnet 2 is in the form of a cube, L I is the edge length of the cube. If the permanent magnet 2 is in the form of a disk, Ll is equal to the diameter of the circular disk. The thickness L2 of the permanent magnet 2 in the north-south direction is smaller than the length Ll. In the rotational position of the permanent magnet 2 shown in Figure 1, the north-south direcon of the magnet is parallel to the secondary air gaps 9 and 10 and the resulting magnetic field at the Hall probe 11 is zero for reasons of symmetry. By rotating the permanent magnet 2, the resulting magnetic field strength at the Hall probe is increased (cf. Figure I a), the magnetomotive force being maximal at 90' rotation (cf. Figure 1 b). The Hall probe 11 measures the field strength and generates an electrical signal corresponding to this field strength or to the rotational position of the permanent magnet 2. The electrical signal is accessible on a measurement line 12. For the measurement of a predertemined range of angular rotation; for example, 60', the angle-of-rotation sensor can be installed so that the permanent magnet 2 is rotated within the limits of the measuring range 0' to 60' by +30' or -30' with respect to the position shown (cf. Figure 1, 1 a). This type of "symmetric subdivision of the range of measurement" with respect to the rotational position shown has the advantage that the electrical signal generated by the Hall probe I I is approximately proportional to the angle of rotation of the permanent magnet 2, that is, the angle-of-rotation sensor has an approximately linear characteristic curve. For applications in which a greater range of measurement, for example 80', i.e., 160' in all, is needed, an electrical circuit can be used which linearizes the signal generated by the Hall probe 11. The two flux-conducting elements 4 and 6 can, for example, be made of a ferromagnetic nickel-iron material. The permanent magnet can be made of ferrite. Alternatively, an economical Ba-fenite magnet or a rare earth magnet can be used. 6 These are commercially available in plastic-bonded flexible form. In a further embodiment of the invention, it is also possible to provide a Hall probe 11 in the secondary air gap 10, which makes possible a redundant determination of the angle of rotation. Figure 2 shows a further embodiment of the angle-of-rotation sensor, in which the permanent magnet 2 is disposed eccentrically with respect to the axis of rotation Ia. The flux-conducting element 4 is divided here by the slot-like recess 3 into two cylindrical sections of different diameter which can be denoted as "magnetic lenses" 13 and 14. From the eccentric position of the permanent magnet 2 or the different size of the magnetic lenses 13 and 14, a different set of field lines to that in the embodiment of Figure I (not shown) results. Figure 3 shows a further embodiment in which the permanent magnet 2 is disposed on the outer edge of the flux-conducting element 4 and the magnetic lens 13 is relatively small. Alternatively, the magnetic lens 13 can be omitted. Figure 4 shows an embodiment in which the permanent magnet 2 is arranged on the edge of the flux-conducting element 4 and projects into the primary air gap 8. In the embodiment shown here, the permanent magnet 2 has flat lateral surfaces 15 and 16 and a flat base surface 17 analogous to the embodiments of Figures 1-3. However, a surface 18 lying opposite the base surface 17 is formed convexly with a radius of curvature which is equal to half the diameter (D2/2) of the first flux-conducting element. Alternatively, the permanent magnet 2 can be provided in the form of a cuboid, that is, with a flat surface 18. Further to the embodiments shown in Figures I to 4, a "reverse measurement arrangement", in which the Hall probe is mounted on the first flux-conducting element 4 and the permanent magnet 2 is mounted on one of the two half cylinders 7a or 7b of the second flux-conducting element, is possible. 7 Figure 5 shows an embodiment in which the permanent magnet 2 and the first fluxconducting element 4 are in the form of an annular segment. The second fluxconducting element 6 is also annular and is arTanged at a radial distance S2 from the permanent magnet 2, so that the primary air gap 8 is formed. The secondary air gap 9 in which the Hall probe 11 is arranged has a width S3. The permanent magnet 2 "tends over an angle a and is arranged in a recess 19 of the first flux-conducting element 4 that extends over an angle P. The angle P is greater than the angle (x. The length L I of the permanent magnet 2 shown in Figure 5 is therefore an arc length. The radial thickness D of the permanent magnet 2 is small with respect to its arc length. The permanent magnet 2 is magnetized radially, that is, the field lines (not represented) enter or exit the magnet in the radial direction. Consequently the magnetic field at the Hall probe 11 is zero in the position shown, analogous to the embodiments of Figures I to 4. The first flux-conducting element 4 extends over an angle 5 which, for example, is twice as large as the angle a and yields a usuable angle of rotation of range 0.5(x, that is 8 in all. The angle a can, for example, be 70. The segmented structure of the individual components makes a more compact mode of construction possible. Alternatively, the permanent magnet 2 can also be in the form of a cuboid (as in the embodiment of Figures I and 2) or be in the form of a circular disk. Furthermore, it is possible, as in the case of the embodiment of Figure 3, to provide a magnetic lens 13 on the side of the permanent magnet 2 facing the primary air gap 9. Clahns:
1. An angle-of-rotation sensor comprising a permanent magnet fastened on a first flux-conducting element extending at least over one circular annular segment with respect to an axis of rotation of the angle-of-rotation sensor whereby the north-south direction of the permanent magnet is aligned perpendicular to the axis of rotation of the sensor, a second flux-conducting element extending over a circular annular segment rotatable about the axis of rotation relative to the first fluxconducting element, a primary air gap lying between the two fluxconducting elements, the second flux-conducting element having a secondary air gap extending radially and in which a magnetic field sensor is arranged, wherein the length of the permanent magnet perpendicular to the axis of rotation of the sensor and perpendicular to the north-south direction of the magnet is smaller than the circumference of the primary air gap.
2. An angle-of-rotation sensor according to Claim 1, wherein the first flux- conducting element is in the form of a cylinder and the second fluxconducting element is in the form of a hollow cylinder arranged so that it surrounds the first flux-conducting element in the manner of a sleeve, the permanent magnet having at least one surface which is plane and parallel to the axis of rotation of the sensor and via which the permanent magnet is immovably connected to the first flux-conducting element.
3. An angle-of-rotation sensor according to Claim I or 2, wherein the first flux- conducting element has a slot running parallel to the axis of rotation of the sensor and in which the permanent magnet is arranged.
4. An angle-of-rotation sensor according to any one of Claims I to 3, wherein the permanent magnet is arranged centrally with respect to the axis of rotation of the sensor and arranged along the axis of rotation.
9
5. An angle-of-rotation sensor according to one of Claims I to 3, wherein the permanent magnet is arranged eccentrically with respect to the axis of rotation of the sensor.
6. An angle-of-rotation sensor according to any one of Claims 1, 2, or 5, wherein the permanent magnet is arranged outside of the first flux-conducting element directly facing the primary air gap.
7. An angle-of-rotation sensor according to any one of Claims I to 6, wherein the permanent magnet is in the form of a cube.
8. An angle-of-rotation sensor according to any one of Claims I to 6, wherein the permanent magnet is in the form of a circular disk.
9. An angle-of-rotation sensor according to Claim 6, wherein a surface of the permanent magnet facing the primary air gap is connected to a convexshaped second flux-conducting element.
10. An angle-of-rotation sensor according to one of Claims I to 9, wherein one of the first and second flux-conducting elements is formed by two hollow semicylinders so that two opposing secondary air gaps are provided.
11. An angle-of-rotation sensor according to Claim 10, wherein a magnetic field sensor is arranged in at least one of the two secondary air gaps.
12. An angle-of-rotation sensor according to any one of the preceding cl i s substantially as herein described with reference to any one of the embodiments shown in the drawings.
GB9916687A 1998-07-16 1999-07-15 Angle-of-rotation sensor Withdrawn GB2339915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19832090A DE19832090A1 (en) 1998-07-16 1998-07-16 Angle-of-rotation sensor for use in the field of motor vehicles for measurement of the position of the throttle control or the position of the accelerator pedal

Publications (2)

Publication Number Publication Date
GB9916687D0 GB9916687D0 (en) 1999-09-15
GB2339915A true GB2339915A (en) 2000-02-09

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ID=7874350

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9916687A Withdrawn GB2339915A (en) 1998-07-16 1999-07-15 Angle-of-rotation sensor

Country Status (4)

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DE (1) DE19832090A1 (en)
FR (1) FR2781281A1 (en)
GB (1) GB2339915A (en)
IT (1) IT1313305B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352522A (en) * 1999-05-28 2001-01-31 Caithness Dev Ltd Magnetic position and field sensors
US6577119B1 (en) 1999-12-01 2003-06-10 Sena Yaddehige Pedal position sensor with magnet movable relative to a magnetic field sensor located in a stator channel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3600114B2 (en) 2000-04-04 2004-12-08 株式会社デンソー Rotation angle detector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158239A (en) * 1984-04-26 1985-11-06 Standard Telephones Cables Ltd Magnetic angular position sensor
WO1988007172A1 (en) * 1987-03-19 1988-09-22 Ampex Corporation A hall effect transducer for sensing the angular position of a rotatable member
DE19630764A1 (en) * 1995-09-29 1997-04-03 Bosch Gmbh Robert Contact free identification device for relative movement
EP0859213A1 (en) * 1997-02-15 1998-08-19 Itt Manufacturing Enterprises, Inc. Angle of rotation detector comprising Hall-effect sensors arranged in an annular yoke
WO1998059212A1 (en) * 1997-06-24 1998-12-30 Valeo Schalter Und Sensoren Gmbh Angle of rotation sensor with an asymmetrically positioned permanent magnet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158239A (en) * 1984-04-26 1985-11-06 Standard Telephones Cables Ltd Magnetic angular position sensor
WO1988007172A1 (en) * 1987-03-19 1988-09-22 Ampex Corporation A hall effect transducer for sensing the angular position of a rotatable member
DE19630764A1 (en) * 1995-09-29 1997-04-03 Bosch Gmbh Robert Contact free identification device for relative movement
US5861745A (en) * 1995-09-29 1999-01-19 Robert Bosch Gmbh Measuring device for contactless determination of relative angular position with an improved linear range
EP0859213A1 (en) * 1997-02-15 1998-08-19 Itt Manufacturing Enterprises, Inc. Angle of rotation detector comprising Hall-effect sensors arranged in an annular yoke
WO1998059212A1 (en) * 1997-06-24 1998-12-30 Valeo Schalter Und Sensoren Gmbh Angle of rotation sensor with an asymmetrically positioned permanent magnet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352522A (en) * 1999-05-28 2001-01-31 Caithness Dev Ltd Magnetic position and field sensors
GB2352522B (en) * 1999-05-28 2003-08-06 Caithness Dev Ltd A sensor
US6577119B1 (en) 1999-12-01 2003-06-10 Sena Yaddehige Pedal position sensor with magnet movable relative to a magnetic field sensor located in a stator channel

Also Published As

Publication number Publication date
ITMI991544A1 (en) 2001-01-13
DE19832090A1 (en) 2000-01-20
GB9916687D0 (en) 1999-09-15
ITMI991544A0 (en) 1999-07-13
FR2781281A1 (en) 2000-01-21
IT1313305B1 (en) 2002-07-17

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