WO2010003801A1 - Dispositif pour détecter un champ magnétique rotatif - Google Patents

Dispositif pour détecter un champ magnétique rotatif Download PDF

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Publication number
WO2010003801A1
WO2010003801A1 PCT/EP2009/057628 EP2009057628W WO2010003801A1 WO 2010003801 A1 WO2010003801 A1 WO 2010003801A1 EP 2009057628 W EP2009057628 W EP 2009057628W WO 2010003801 A1 WO2010003801 A1 WO 2010003801A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
sensor magnet
magnetic field
magnet
contour
Prior art date
Application number
PCT/EP2009/057628
Other languages
German (de)
English (en)
Inventor
Rolf Baumann
Steven Andrew Evans
Jochen Geissler
Marcus Meyer
Tilo Koenig
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2010003801A1 publication Critical patent/WO2010003801A1/fr

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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

Definitions

  • the invention relates to a device for detecting a rotating magnetic field according to the preamble of claim 1.
  • the information about the current rotational position of the rotor in the engine plays an important role, for example in drive motors of wipers in motor vehicles, in actuators for transmission or hydraulic systems or in electrical actuatable steering drives.
  • To determine the rotational position devices for detecting a rotating magnetic field are often used, which include a sensor or encoder magnet and a magnetic field sensor for detecting the magnetic field generated by the sensor magnet.
  • the sensor magnet is rotatably connected to the rotor of the electric motor and therefore has the same speed as the rotor.
  • the periodically changing magnetic field of the rotating sensor magnet is detected by the magnetic field sensor, from which the current rotational angle of the rotor can be determined.
  • two-pole magnetized plates or disks are usually used as sensor magnets, wherein the sensor is arranged at a distance from the magnet surface and detects the rotating magnetic field.
  • the relative position of the sensor Based on the sensor magnet has a significant influence on the strength of the detected signal, since the amplitude of the signal drops sharply with increasing distance to the magnetic surface.
  • the position of the sensor relative to the sensor magnet has a high influence on the quality of the measurement result, so that manufacturing and component tolerances have a relatively strong effect, in particular with a small distance to the magnet.
  • increasing the distance to the magnet surface reduces the dependence on tolerances, at the same time the magnetic flux density decreases, so that more sensitive sensors must be used.
  • the invention is based on the object, with simple design measures, a device for detecting a rotating magnetic field comprising a sensor magnet and an associated sensor, form so that the sensor signals are less dependent on the position of the sensor relative to the magnet, i. that on the one hand the
  • the inventive device for detecting a rotating magnetic field is preferably used in electric motors, in particular as a servomotor of an aggregate or accessory in a motor vehicle, for example as a wiper motor in wiper devices, as a window motor or possibly also as a servo motor for transmission or hydraulic systems, in a steering or brake system.
  • the device comprises a donor or
  • the magnetic field generated during the rotation of the sensor magnet is detected by the magnetic field sensor and can be used to calculate the rotational angle position or a change in the rotational angular position.
  • the sensor magnet is at least approximately annular and includes an inner recess at least partially, in which the
  • Magnetic field lines run between the poles of the magnet; the inner recess forms a magnetic field line space enclosed by the surrounding ring of the sensor magnet.
  • the magnetic field sensor is arranged within an envelope bounded by the inner recess, but at an axial distance from the inner recess. This means that although the sensor is arranged at an axial distance from the magnet, but directly above the inner recess in the magnet, the envelope coincides with the inner wall of the annular sensor magnet, which delimits the inner recess or magnetic field space, but axially projects beyond the inner wall.
  • the magnetic field lines extend within the inner recess at least approximately parallel to the center plane of the annular sensor magnet. With axial distance to the front of the
  • Sensor magnets take the field lines of the magnetic field a curved course, which has been shown in the device according to the invention that even at an axial distance from the top of the magnet, a constant flux density can be achieved. Due to the positioning of the sensor within the limited space of the envelope, a reduction of the dependence of the sensor signals is achieved by the center distance, so that on the one hand component and assembly tolerances impact less on the sensor result and on the other hand, the sensors in a much larger Achsabstands Scheme can be used to the magnet. Accordingly, also cheaper - A -
  • Magnetic materials used and / or smaller sized sensor magnets are used.
  • a GMR sensor As a magnetic field sensor, a GMR sensor (Giant Magneto Resistance) is preferably used. Here, a significant reduction in length can be achieved. In principle, however, is also an application of other magnetic field sensors into consideration, such as AMR sensors (anisotropic magnetoresistive effect).
  • central recess in the magnet further conditions may be met, in particular constructive conditions that contribute to an optimization of the desired effect ,
  • a certain ratio of inner diameter to outer diameter of the sensor magnet is predetermined, wherein the ratio is preferably between 0.1 and 0.5. If the ratio is close to the value 0.5, this means that the magnet has a relatively large inner recess in relation to the outer diameter, as a result of which the region in which the sensor can be positioned axially above the magnet is correspondingly increased.
  • the sensor magnet has proven expedient to equip the sensor magnet with an overall axial height or thickness of 1 mm to about 8 mm.
  • the outer diameter of the sensor magnet is preferably 5 mm to 50 mm.
  • the radial outer contour and the radial inner contour of the sensor magnet extend at least approximately concentrically with one another.
  • the inner contour is circular, accordingly, the enclosing the magnetic field line inner space limiting cylinder shape.
  • circular contours are also non-circular, concentric outer and inner contours into consideration, for example, angular contours such as square or rectangular. In principle, non-concentric designs are possible.
  • the transition from the outer contour to an axial end face of the sensor magnet in particular that side on which the sensor is arranged, be designed symmetrically to the transition from the inner contour to the same axial end face.
  • a chamfer on the inner contour and / or the outer contour it being possible to provide both different chamfer angles and the same chamfer angle, for example a chamfer angle of 45 °.
  • a rounded bevel can also be provided, in particular with a constant radius.
  • the axial height of the chamfer is, based on the total height of the sensor magnet, between 10% and 90%, for example 50% or 60%. In symmetrical design, the radially inner chamfer is the same design as the radially outer chamfer.
  • the magnetic field sensor is arranged along the longitudinal axis of the sensor magnet.
  • the magnetic field lines of the sensor magnet extend at least approximately perpendicular to the axis, whereas with lateral distance from the axis, the magnetic field lines are directed at an angle to the axis.
  • the constant angle of about 90 ° along the axis allows the Position the sensor at different axis positions along the axis, without this being accompanied by a significantly changing flux density.
  • the design of the sensor magnet with inner recess has the advantage that in the case of a deviation of the sensor magnet or sensor position from the longitudinal axis, the generated measurement signal has a smaller angular deviation due to the more homogeneous magnetic field compared to prior art embodiments.
  • FIG. 1 is a perspective view of a device for detecting a rotating magnetic field, with an annular sensor magnet having a central recess, and a magnetic field sensor, which is arranged at an axial distance along the longitudinal axis of the sensor magnet,
  • Fig. 3 to 10 different embodiments for the structural design of the sensor magnet.
  • a device 1 for detecting a rotating magnetic field consisting of an annular
  • the magnetic field 5 which emanates from the sensor or encoder magnet 2, extends in a magnetic field line or interior, which is designed as an inner recess 6 of the annular sensor magnet 2, approximately parallel to the median plane of the sensor magnet 2.
  • the magnetic field lines emerge from the sensor magnet and describe, starting from a pole of the bipolar, with north pole N and south pole S designated magnet, an arc in which the magnetic field lines at the second pole again enter the material of the sensor magnet.
  • a is located above the sensor magnet 2 of the magnetic field sensor 3, which is arranged in particular along the longitudinal axis 4 of the sensor magnet 2.
  • the magnetic field lines of the magnetic field 5 also extend approximately parallel to the plane of the sensor magnet.
  • the magnetic field sensor 3 may optionally also be arranged with lateral deviation with respect to the longitudinal axis 4, but it is preferably located within an envelope which is guided through the inner side or contour 8 of the inner recess 6 within the sensor magnet 2 and extends parallel to the axis in the axial direction Longitudinal axis 4 extends.
  • the magnetic field sensor 3 is in particular a GMR sensor.
  • other sensor types are also considered, in particular AMR sensors, TMR sensors, Hall sensors, P-Hall sensors or other sensor types.
  • plastic-bonded magnetic materials containing, for example, ferrite, SmCo or NdFeB. Basically, however, sintered materials made of ferrite, SmCo or NdFeB come into consideration.
  • the device 1 is preferably used for position detection of the rotor of an electric motor.
  • the sensor magnet 2 is rotatably connected to the rotor of the electric motor, whereas the magnetic field sensor 3 is arranged fixed to the housing.
  • the magnetic field sensor 3 is arranged fixed to the housing.
  • Magnetic field sensor fixed to the rotor and the sensor or encoder magnet is fixed to the housing.
  • the sensor magnet 2 is shown in section.
  • the overall height or thickness is denoted by h, the inner diameter of the inner recess 6 by d, the outer diameter of the outer contour 7 with D.
  • a chamfer 9 or 10 which assumes an angle ⁇ or ⁇ relative to the longitudinal axis 4 or a parallel to the longitudinal axis.
  • the angles ⁇ and ß are equal, they are about 45 °. In principle, however, different angles ⁇ and ⁇ for the chamfer 9 or 10 on the outer contour 7 or the inner contour 8 come into consideration.
  • the axial height of the chamfers 9 and 10 is denoted by c.
  • the axial height c of the chamfers 9 and 10 is between 10% and 90% of the total axial height h of the sensor magnet. In the exemplary embodiment, c is about 60% of h.
  • the ratio d to D of inner diameter d to outer diameter D is preferably between 0.1 and 0.7.
  • the outer diameter D is advantageously 5 mm to 50 mm
  • the total axial height h is 1 mm to 8 mm.
  • the sensor magnet 2 is designed as a cylindrical ring with a continuous cylindrical outer contour 7 and inner contour 8 in the region of the inner recess 6.
  • the outer contour 7 is cylindrical
  • the inner contour 8 has a chamfer 10.
  • the envelope through the inner contour 8 can either be placed in the region of the cylindrical portion through the inner contour 8 or, according to an alternative embodiment, by the transition between the chamfer 10 and the end face of the sensor magnet 2, the mounted in the Condition facing the magnetic field sensor; in the latter case, the chamfer is enclosed by the envelope.
  • chamfer 9 is provided in the region of the outer contour 7, whereas the inner contour 8 is cylindrical and without chamfer.
  • both a chamfer 9 in the region of the outer contour 7 and a chamfer 10 in the region of the inner contour 8 are provided; This embodiment corresponds to that of FIG. 2.
  • a chamfer is also provided on the inside and the outside, wherein the transition of the chamfer 10 is formed rounded in the region of the inner contour to the cylindrical portion of the inner contour.
  • Figures 8 and 9 substantially correspond to the embodiment of FIG. 7, but with increasing rounding in the transition between the cylindrical inner contour of the chamfer 10th
  • the chamfer 10 extends radially outward until reaching the outer chamfer 9, which is associated with the outer contour 7.

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)

Abstract

L’invention concerne un dispositif pour détecter un champ magnétique rotatif, lequel dispositif comprend un aimant de détection et un détecteur de champ magnétique, l’aimant de détection et le détecteur de champ magnétique pouvant effectuer un mouvement de rotation l’un par rapport à l’autre. L’aimant de détection présente un évidement intérieur, le détecteur de champ magnétique étant disposé à l’intérieur d’une enveloppe limitant l’évidement, mais à distance axiale de l’aimant de détection.
PCT/EP2009/057628 2008-07-11 2009-06-18 Dispositif pour détecter un champ magnétique rotatif WO2010003801A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810040360 DE102008040360A1 (de) 2008-07-11 2008-07-11 Einrichtung zur Erfassung eines rotierenden Magnetfelds
DE102008040360.1 2008-07-11

Publications (1)

Publication Number Publication Date
WO2010003801A1 true WO2010003801A1 (fr) 2010-01-14

Family

ID=41058622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/057628 WO2010003801A1 (fr) 2008-07-11 2009-06-18 Dispositif pour détecter un champ magnétique rotatif

Country Status (2)

Country Link
DE (1) DE102008040360A1 (fr)
WO (1) WO2010003801A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014200365A1 (de) * 2013-11-26 2015-05-28 Continental Teves Ag & Co. Ohg Sensoranordnung und Magnetisierungsvorrichtung sowie Verwendung der Sensoranordnung in einem Kraftfahrzeugsteuergerät
US11874140B2 (en) 2016-02-17 2024-01-16 Infineon Technologies Ag Tapered magnet
PL3708465T3 (pl) * 2019-03-15 2022-11-21 Bourns, Inc. Pojazd z czujnikiem kąta skrętu

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040070390A1 (en) * 2002-10-09 2004-04-15 Lamb Wayne A. Magnetic angular position sensor apparatus
DE102004029483A1 (de) * 2003-11-14 2005-06-23 Ruf Automotive Gmbh Drehsensor
US20060089784A1 (en) * 2004-10-25 2006-04-27 Spicer Gary J Angular position sensor-based engine controller system
DE102007034099A1 (de) * 2007-07-21 2009-01-22 Hartmann-Exact Gmbh Vorrichtung zur berührungslosen Erfassung von Relativpositionen zweier zueinander bewegbarer Teile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040070390A1 (en) * 2002-10-09 2004-04-15 Lamb Wayne A. Magnetic angular position sensor apparatus
DE102004029483A1 (de) * 2003-11-14 2005-06-23 Ruf Automotive Gmbh Drehsensor
US20060089784A1 (en) * 2004-10-25 2006-04-27 Spicer Gary J Angular position sensor-based engine controller system
DE102007034099A1 (de) * 2007-07-21 2009-01-22 Hartmann-Exact Gmbh Vorrichtung zur berührungslosen Erfassung von Relativpositionen zweier zueinander bewegbarer Teile

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Publication number Publication date
DE102008040360A1 (de) 2010-01-14

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