WO2007014599A1 - Dispositif pour detecter des rotations d'un arbre de direction - Google Patents

Dispositif pour detecter des rotations d'un arbre de direction Download PDF

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Publication number
WO2007014599A1
WO2007014599A1 PCT/EP2006/005922 EP2006005922W WO2007014599A1 WO 2007014599 A1 WO2007014599 A1 WO 2007014599A1 EP 2006005922 W EP2006005922 W EP 2006005922W WO 2007014599 A1 WO2007014599 A1 WO 2007014599A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
magnetic field
steering shaft
ferromagnetic element
field sensor
Prior art date
Application number
PCT/EP2006/005922
Other languages
German (de)
English (en)
Inventor
Ekkehart Froehlich
Jens Thom
Original Assignee
Valeo Schalter Und Sensoren 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 Valeo Schalter Und Sensoren Gmbh filed Critical Valeo Schalter Und Sensoren Gmbh
Publication of WO2007014599A1 publication Critical patent/WO2007014599A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D15/00—Steering not otherwise provided for
    • B62D15/02—Steering position indicators ; Steering position determination; Steering aids
    • B62D15/021—Determination of steering angle
    • B62D15/0215—Determination of steering angle by measuring on the steering column
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • 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
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/104—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving permanent magnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
    • G01L5/221—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to steering wheels, e.g. for power assisted steering

Definitions

  • the invention relates to a device for detecting revolutions of a steering shaft, with a coupled with the movement of the steering shaft permanent magnet which describes an annular path upon rotation of the steering shaft, which passes on a stationary relative to the permanent magnet magnetic field sensor.
  • Such sensors are based on the Hall effect, which can be used to measure magnetic fields in an existing between the permanent magnet and the magnetic field sensor air gap.
  • the known Hall sensors are relatively robust and also suitable for applications in which high temperatures can occur. Due to the increasing integration of various components and assemblies in a motor vehicle, however, there is the problem that influence these components or assemblies each other.
  • the present invention is based on the object, a device for the detection of To create revolutions of a steering shaft, with the magnetic interference can be minimized.
  • Characterized in that seen along the course of the annular path of the permanent magnet to each other opposite poles, formed between the opposite poles magnetic field lines can be influenced in their course so that they extend from a first pole to an opposite pole, without taking up space and thus the surroundings of the device are magnetically disturbing around the entire magnet.
  • the magnetic field lines can be reduced spatially limited, so that closed magnetic field lines arise.
  • the magnetic field lines can be returned to a limited extent on one side of the magnet.
  • the magnetic field thus generated is locally limited and thus has a less magnetic influence on the environment of the device.
  • the ferromagnetic element thus has a shielding effect.
  • the magnetic field generated according to the invention is also relatively dense and thus easy to detect for a magnetic field sensor, in particular for a magnetic field sensor with a unipolar switching characteristic
  • the ferromagnetic element may be arranged in a plane parallel to the annular path. As a result, a space which is arranged relative to the ferromagnetic element on a side opposite to the permanent magnet side, at least largely freed from magnetic interference.
  • the ferromagnetic element may also be radially offset relative to the annular track.
  • magnetic perturbations in a radially more inwardly offset region can be minimized.
  • magnetic perturbations in a radially outward offset region can be minimized.
  • the permanent magnet can, in particular on its free side, at least one north pole and at least one south pole exhibit.
  • the permanent magnet thus has at least two mutually opposite poles.
  • the permanent magnet may have a pole arranged on the outside of the opposite central pole.
  • This embodiment has the advantage that a particularly homogeneous and dense magnetic field is created, which is also evaluable with a magnetic field sensor which generates a digital output value.
  • This embodiment also has the advantage that a locally particularly pronounced magnetic field is created.
  • the ferromagnetic element is advantageously formed by a ferrous metal sheet.
  • This metal sheet also has a shielding effect, in particular when the metal sheet is formed so that it projects beyond the permanent magnet on all sides.
  • a particularly advantageous embodiment provides that the permanent magnet and the ferromagnetic element are arranged on a common carrier. This arrangement facilitates the accurate positioning of the permanent magnet and the ferromagnetic element to each other. At the same time the unit of carrier, permanent magnet and ferromagnetic element is easy to handle.
  • the common carrier is formed of plastic material, the magnetic field formed between the permanent magnet and the magnetic field sensor is not affected.
  • the common carrier is designed as a ring member which is non-rotatably connected to the steering shaft and / or with a torque sensor arranged on the steering shaft, a circular path for the permanent magnet can be generated in a particularly simple manner, thereby ensuring that the permanent magnet with a exact, predetermined distance (air gap) can be passed to the magnetic field sensor.
  • a torque sensor as in this case, Hall sensors can be used for the torque sensor. These are not or only slightly disturbed by the described, shielded course of the magnetic field between the permanent magnet and the magnetic field sensor. The shielding effect is particularly good when the ferromagnetic element is arranged in the axial direction of the steering shaft between the permanent magnet and the torque sensor.
  • the common carrier can also be part of one
  • Be torque sensors so that a unit can be created, which requires only a few parts.
  • non-influencing Hall sensors or sensors for controlling the steering of a motor vehicle can be used in a small space.
  • the magnetic field sensor of the device for detecting revolutions of the steering shaft is arranged on or on a circuit board which is at least partially associated with a torque sensor.
  • the invention further relates to various methods for operating a device for detecting revolutions of a steering shaft.
  • Figure 1 is a perspective view of a structural unit of a device for detecting revolutions of a steering shaft and a torque sensor when mounted on a steering shaft;
  • FIG. 2 is a perspective view of a carrier for a permanent magnet and a ferromagnetic element
  • FIG. 3 shows a magnetic field formed by the permanent magnet and the ferromagnetic element according to FIG. 2;
  • FIG. 4 shows the magnetic induction generated by the magnetic field according to FIG. 3;
  • Figure 5 plotted the magnetic induction over different angles of rotation of the steering shaft for different air gaps between the permanent magnet and the magnetic field sensor
  • Figure 6 is a view corresponding to Figure 5 for a two-pole magnet.
  • FIG. 7 shows a view corresponding to FIG. 3 for the two-pole magnet according to FIG. 6.
  • a device for detecting revolutions of a steering shaft is denoted overall by the reference numeral 2.
  • a torque sensor 4 Adjacent to this device 2, a torque sensor 4 is arranged, wherein the device 2 and the torque sensor 4 form a structural unit 6.
  • This structural unit 6 is mounted on a steering shaft 8, wherein the steering shaft shaft portions 10 and 12, which are rotatable relative to each other.
  • the Shaft sections 10 and 12 are rotatable relative to each other, wherein between the shaft sections 10 and 12 applied torsional force can be detected by the torque sensor 4.
  • the torque sensor 4 has a housing part, which is designed as an annular support 14, which consists of a plastic material. This is shown in Figure 2, in perspective.
  • the carrier 14 is rotatably connected to the shaft portion 10 and serves, inter alia, to hold components associated with the stator side of the torque sensor 4.
  • a permanent magnet 16 and a ferromagnetic element 18 is further arranged.
  • the permanent magnet 16 and the ferromagnetic element 18 are formed in accordance with Figure 2 is substantially cuboid.
  • Both the permanent magnet 16 and the ferromagnetic element 18 may, however, also extend along a circular arc, in particular adapted to the annular course of the carrier 14.
  • the permanent magnet 16 moves along a circular path 24 schematically indicated in FIG. 4.
  • the ferromagnetic element 18 moves in a plane parallel to the web 24.
  • the permanent magnet 16 can be passed with a corresponding rotational position of the steering shaft 8 to a stationary magnetic field sensor 26, wherein between the permanent magnet 16 and the magnetic field sensor 26, an air gap is formed.
  • the magnetic field sensor 26 is arranged on a circuit board 28, which is also associated with the torque sensor 4.
  • the circuit board 28 has a second magnetic field sensor 30, which is assigned to the torque sensor 4.
  • the carrier 14 is formed substantially rotationally symmetrical and has an annular bead 32, with which the carrier 14 is rotatably connected to the shaft portion 10 of the steering shaft 8. From the bead 32 extends radially outwardly an annular disc 34, in which the permanent magnet 16 and the ferromagnetic element 18 are injected.
  • the carrier 14 is shown cut in a portion of the annular disc 34 to make the shape of the permanent magnet 16 and the ferromagnetic element 18 more visible.
  • the permanent magnet 16 has according to Figure 3 a total of three poles and that is a central north pole 36 and two outside south poles 38.
  • the outside south poles 38 have the same length together as the central north pole 36.
  • the permanent magnet 16 and the ferromagnetic elements 18 are arranged in parallel planes. In this case, the ferromagnetic element 18 extends in its plane beyond the outer sides of the permanent magnet 16 addition, which is particularly well visible in Figure 4.
  • the magnetic field generated by the described structure of permanent magnet 16 and ferromagnetic element 18 is shown in Figure 3 based on magnetic field lines.
  • the magnetic field has main field lines 40 which extend arcuately from the north pole 36 back to one of the south poles 38, pass therethrough and are returned via the ferromagnetic element 18.
  • the magnetic field also has adjacent field lines 42, which extend approximately laterally adjacent to the south poles 38.
  • the magnetic field lines 40 and 42 extend outside the material of the permanent magnet 16 and of the ferromagnetic element 18 only in a region which, viewed from the ferromagnetic element 18, faces the permanent magnet 16.
  • the rear region in which the torque sensor 4 is arranged can be freed of interfering magnetic field influences, so that the function of the magnetic field sensor 30 is not impaired.
  • the permanent magnet 16 is moved along the annular path indicated by 24 and is guided past the magnetic field sensor 26, a magnetic induction is produced.
  • the field strength detected by the magnetic field sensor is shown in FIG.
  • the north pole 36 is associated with a magnetic induction 44
  • the south poles 38 each have an opposite magnetic induction 46.
  • the magnetic inductions 44 and 46 have local maxima, which are assigned to the centers of the respective poles 36 and 38.
  • FIG. 5 shows a diagram in which the Tesla values of the magnetic inductions 44 and 46 are plotted over different angles of rotation of the steering shaft 8.
  • the magnetic inductions 44 and 46 cause the magnetic field sensor 26 to produce an output signal 48 whose value is 0 or 1.
  • FIG. 5 shows further courses of magnetic inductions 50 and 52. These inductions are compared with the magnetic Inductions 44 and 46 associated with smaller air gaps between the permanent magnet 16 and magnetic field sensor 26, so that the local maxima of the magnetic Inductions 50 and 52 are more pronounced. Regardless of the choice of the air gap, the course of the magnetic induction 44 and 46 intersect with the Runs 50 and 52 in areas that are associated with approximately a rotation angle of the steering shaft 8 of -5 ° and + 5 °. In this case, the exact angular positions are determined by the position of the pole transitions between the north pole 36 and the south poles 38.
  • the courses of the magnetic inductions 44, 46, 50 and 52 are such that the transition from a negative magnetic induction (eg 46) to a positive magnetic induction (eg 44) with a comparatively steep gradient accompanied.
  • the switching thresholds 54 are assigned to a very small angular range, as a result of which the values of the output signal 48 can change precisely and reproducibly between 0 and 1.
  • the magnetic field sensor 26 may have some hysteresis despite the described steep gradient. This means that the magnetic field sensor 26 when exceeded a first switching threshold of "0" to "1" and when a second switching threshold falls below the value of the hysteresis is less than the value of the first switching threshold, again provides an output signal "0".
  • a first switching threshold of "0" to "1” when exceeded a second switching threshold falls below the value of the hysteresis is less than the value of the first switching threshold, again provides an output signal "0".
  • the switching point for the change from "0" to "1" is associated with a rotation angle which is -5.3 ° (see reference numeral 72 in FIG. 5).
  • the width between the switching points 72 and 74 depends on the air gap between the permanent magnet 16 and the magnetic field sensor 26.
  • the position of the index center 76 is, however, from this air gap independent and can be used as an exact reference position.
  • tolerances of the overall lengths of the centric pole 36 of the permanent magnet 16 can be computed by means of an evaluation unit. In a corresponding manner, rotational angle tolerances can be compensated, which result during assembly of the carrier 14 on the steering shaft 8.
  • FIG. 6 shows the course of a magnetic induction 56 for a two-pole magnet shown in FIG. 7, again plotted over the angle of rotation of the steering shaft 8.
  • the profile In a region adjacent to 0 °, the profile has a local minimum and, subsequently, a steep flank which leads to leading to a local maximum.
  • the magnetic induction is point symmetric about a zero crossing designated 58.
  • the magnetic induction 56 generated by means of the two-pole permanent magnet 60 shown in FIG. 7 can be evaluated, for example, by a linear magnetic field sensor which outputs an output signal proportional to the magnetic induction.
  • the zero crossing 58 corresponds to a reference position, which can be determined precisely by the fact that the described edge in the region of the zero crossing 58 is very steep. According to FIG.
  • the permanent magnet 60 is arranged adjacent and parallel to a ferromagnetic element 62.
  • the permanent magnet 60 has a south pole 64 and a north pole 66, each occupying half of the material of the permanent magnet 60.
  • a magnetic field is generated having 68 designated main field lines, which lead from the north pole 66 to the south pole 64 and via the ferromagnetic element 62 back to the north pole.
  • the magnetic field has side-field lines 70 arranged laterally.
  • the permanent magnet 60 and the ferromagnetic element 62 may be arranged in the carrier 14 instead of the permanent magnet 16 and the ferromagnetic element 18 (see FIG. 2).
  • the permanent magnets 16 and 18 and their ferromagnetic elements 18 and 62 can also be arranged on the radially outer circumference of the annular disc 34, so that the permanent magnet 16 and the permanent magnet 60 faces radially outward and the ferromagnetic element 18 and 62 in the radial direction inside is arranged.
  • the associated magnetic field sensor 26 can then be positioned in the radial direction outside and in alignment with the permanent magnet 16 or 60.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Power Steering Mechanism (AREA)

Abstract

L'invention concerne un dispositif (2) permettant de détecter des rotations d'un arbre de direction (8), comportant un aimant permanent (16, 60) couplé au mouvement de l'arbre de direction (8), qui décrit une trajectoire annulaire (24) lorsque l'arbre de direction (8) tourne, ladite trajectoire passant devant un capteur de champ magnétique (26), stationnaire par rapport à l'aimant permanent (16, 60). Ledit aimant permanent (16, 60) présente, vu à l'intérieur de la courbe décrite par la trajectoire annulaire (24), des pôles (36, 38; 64, 66) en opposition mutuelle et un élément ferromagnétique (18, 62) est disposé à proximité de l'aimant permanent (16, 60).
PCT/EP2006/005922 2005-07-29 2006-06-21 Dispositif pour detecter des rotations d'un arbre de direction WO2007014599A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005038516.8 2005-07-29
DE102005038516A DE102005038516A1 (de) 2005-07-29 2005-07-29 Vorrichtung zur Detektion von Umdrehungen einer Lenkwelle

Publications (1)

Publication Number Publication Date
WO2007014599A1 true WO2007014599A1 (fr) 2007-02-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/005922 WO2007014599A1 (fr) 2005-07-29 2006-06-21 Dispositif pour detecter des rotations d'un arbre de direction

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DE (1) DE102005038516A1 (fr)
WO (1) WO2007014599A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011004120A2 (fr) 2009-07-07 2011-01-13 Moving Magnet Technologies (Mmt) Capteur de position absolue et multi-périodique
US8390276B2 (en) 2010-09-27 2013-03-05 Bourns Incorporated Target magnet assembly for a sensor used with a steering gear
US8448528B2 (en) 2010-09-27 2013-05-28 Bourns Incorporated Three-piece torque sensor assembly
US8970210B2 (en) 2009-11-06 2015-03-03 Moving Magnet Technologies (Mmt) Bidirectional magnetic position sensor having field rotation
US10041780B2 (en) 2010-09-29 2018-08-07 Moving Magnet Technologies (Mmt) Position sensor

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007050209A1 (de) * 2007-10-20 2009-04-23 Valeo Schalter Und Sensoren Gmbh Sensorhalterung und Verfahren zur Befestigung einer Drehmoment- oder Drehwinkelsensoranordnung
US8607650B2 (en) * 2008-07-14 2013-12-17 Continental Teves Ag & Co. Ohg Torque sensor arrangement with rotational angle index detection
DE102008044059A1 (de) * 2008-11-25 2010-05-27 Zf Lenksysteme Gmbh Sensoreinrichtung zur Drehmomentmessung in Lenksystemen
DE102010031848A1 (de) * 2010-07-22 2012-01-26 Schaeffler Technologies Gmbh & Co. Kg Tretlager für ein Fahrrad
DE102010064145A1 (de) * 2010-08-03 2012-02-09 Continental Teves Ag & Co. Ohg Drehmomentsensoranordnung mit Indexmagnet
DE102011078281A1 (de) 2010-08-04 2012-02-09 Continental Teves Ag & Co. Ohg Sensoranordnung mit magnetischem Index-Encoder in einer Lagerdichtung
DE102010033769A1 (de) * 2010-08-09 2012-02-09 Valeo Schalter Und Sensoren Gmbh Vorrichtung mit einem Drehmomentsensor und einem Drehwinkelsensor
KR20120027658A (ko) * 2010-09-13 2012-03-22 엘지이노텍 주식회사 토크 인덱스 센서
DE102011118642A1 (de) 2011-11-15 2013-05-16 Valeo Schalter Und Sensoren Gmbh Verfahren zum Verbinden eines Sensorteils mit einem Wellenteil eines Kraftfahrzeugs und Anordnung mit einem Wellenteil und einem Sensorteil
DE102011056899B4 (de) * 2011-12-22 2015-07-16 Max Baermann Gmbh Drehmomentsensoreinrichtung für ein Lenksystem
DE102013006379A1 (de) 2013-04-13 2014-10-16 Valeo Schalter Und Sensoren Gmbh Sensorvorrichtung mit einer Drehmomentsensoreinrichtung und einer Inkrementalsensoreinrichtung und Kraftfahrzeug
DE102018200564A1 (de) * 2018-01-15 2019-07-18 Zf Friedrichshafen Ag Gebermagnetanordnung und Verfahren zur Montage
DE102020121895A1 (de) 2020-08-20 2022-02-24 Bourns, Inc. Sensor zum Erfassen einer Position
DE102021129981A1 (de) 2021-11-17 2023-05-17 Valeo Schalter Und Sensoren Gmbh Sensorvorrichtung mit einer Drehmomentsensoreinrichtung und einer Lenkwinkelsensoreinrichtung für ein Kraftfahrzeug

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EP1439395A1 (fr) * 2003-01-20 2004-07-21 RFT S.p.A. Dispositif de commande utilisant une roue à impulsions

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GB893986A (en) * 1958-10-28 1962-04-18 Ferranti Ltd Improvements relating to electrical impulsing devices
DE3730218A1 (de) * 1987-09-09 1989-03-30 Magnetfab Bonn Gmbh Vorrichtung, insbesondere tachometerrad, fuer beruehrungslose drehzahlabnahme oder kontaktgabe an maschinen
US5313182A (en) * 1992-02-28 1994-05-17 The Torrington Company Magnet structure for a displacement sensor
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EP1439395A1 (fr) * 2003-01-20 2004-07-21 RFT S.p.A. Dispositif de commande utilisant une roue à impulsions

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011004120A2 (fr) 2009-07-07 2011-01-13 Moving Magnet Technologies (Mmt) Capteur de position absolue et multi-périodique
KR20120049250A (ko) 2009-07-07 2012-05-16 무빙 마그네트 테크놀로지스 다중-주기 절대 위치 센서
US8890514B2 (en) 2009-07-07 2014-11-18 Moving Magnet Technologies (Mmt) Magnetic multi-periodic absolute position sensor
US8970210B2 (en) 2009-11-06 2015-03-03 Moving Magnet Technologies (Mmt) Bidirectional magnetic position sensor having field rotation
US8390276B2 (en) 2010-09-27 2013-03-05 Bourns Incorporated Target magnet assembly for a sensor used with a steering gear
US8448528B2 (en) 2010-09-27 2013-05-28 Bourns Incorporated Three-piece torque sensor assembly
US10041780B2 (en) 2010-09-29 2018-08-07 Moving Magnet Technologies (Mmt) Position sensor

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