WO2008049690A1 - Détecteur de champ magnétique - Google Patents

Détecteur de champ magnétique Download PDF

Info

Publication number
WO2008049690A1
WO2008049690A1 PCT/EP2007/059457 EP2007059457W WO2008049690A1 WO 2008049690 A1 WO2008049690 A1 WO 2008049690A1 EP 2007059457 W EP2007059457 W EP 2007059457W WO 2008049690 A1 WO2008049690 A1 WO 2008049690A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic field
carrier
sensor
field sensor
conductor tracks
Prior art date
Application number
PCT/EP2007/059457
Other languages
German (de)
English (en)
Inventor
Matthias Moerbe
Matthias Waibler
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 WO2008049690A1 publication Critical patent/WO2008049690A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/02—Housings
    • G01P1/026—Housings for speed measuring devices, e.g. pulse generator
    • 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
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors

Definitions

  • the invention relates to a magnetic field sensor, in particular a speed and / or direction of rotation sensor for a vehicle or for the drive train of a vehicle, according to the preamble of the independent claim.
  • a magnetic field sensor of the aforementioned type which has a connectable via an electrical cable IC device with a transducer assembly and an electronic circuit arrangement for conditioning of the measurement signals.
  • the sensor arrangement is designed as a housing-less integrated circuit in flip-chip technology and enclosed together with a permanent magnet by a diamagnetic or paramagnetic, cup-shaped cover and molded with plastic. Such an arrangement operates basically satisfactorily and is also compact to produce, however, the handling of the non-molded integrated circuit in manufacturing difficulties.
  • SMD components used for the reduction of circuit structures.
  • SMD components used for the assembly of printed circuit boards, as they allow in particular a double-sided surface placement of printed circuit boards.
  • the use for the construction of sensor elements is not common for such devices.
  • the magnetic field sensor according to the invention with the features of the independent claim has the advantage that a readily manageable in the subsequent application, mechanically well protected and precisely working component is provided with compact dimensions.
  • Components with housing-fixed connections in the form of contact surfaces or very short and stiff connection pins ensures precise connection dimensions and compared to other electrical components high positioning accuracy and thus high measurement accuracy of the finished sensor. Any damage or inaccuracies caused by bending of connection pins during positioning and contacting are virtually completely avoided.
  • S M D capacitor element can advantageously be arranged in a recess of the carrier, in which the conductor tracks are exposed with their connection points for the capacitor element and can be contacted directly by the SMD component.
  • connection cable The overall arrangement of the carrier, the tracks, the components and the connections of a connection cable can then be encapsulated in a final step with plastic to secure the positioning and contacting of the individual elements of the magnetic field sensor and a mechanically, electrically and thermally stable unit create.
  • Fig. 2 is a perspective view of the pre-assembled magnetic field sensor before encapsulation with plastic
  • Fig. 3 is a perspective view of a finished molded magnetic field sensor in front of a sensor wheel.
  • 10 denotes the carrier of a magnetic field sensor, which forms in the present embodiment, a speed and / or Drehraumssen- sensor for a vehicle or for the drive train of a vehicle.
  • the carrier 10 has a plastic base body 12 produced by injection molding of polyamide, in which a crimping device 14 is injected at the right end.
  • the crimping device continues in strip conductors 16a, b which form contact sections 18a, b in the region of a recess 20 and end contacts 22a, b on the front side 24 of the carrier 10, where subsequently a sensor element 26a or 26b is produced by soldering or by conductive adhesive at the contact points 28a, b fastened and contacted.
  • contacts 30a, b are formed on the conductor tracks 16a, b, on which a capacitor 32 is also fastened and contacted by conductive adhesive or soldering in order to suppress occurring voltage peaks.
  • At least the magnetic-field-sensitive sensor element 26 in the embodiment 26a with contact surfaces 33a, b or in the formation 26b with mini-pins 34a, b is designed as an SM D component (surface mounted device).
  • SM D component surface mounted device
  • S M D component in addition to the sensor element 26 and the capacitor 32 is formed as S M D component.
  • S M D component With a suitable design of the recess 20 and the contact portions 18a, 18b of the conductor tracks 16a, b and this component is in the same way as the sensor element 26 to the carrier easily and precisely positioned.
  • the embodiment 26a has the advantage that it can be fastened with its contact surfaces 33a, b without any kind of pin directly on the end contacts 22a, b of the conductor tracks 16a, b.
  • the embodiment 26b shows a commercially available housing of an SMD component with so-called mini-pins 34a, b, whose dimensions and arrangement are fixed according to the housing of the component, so that exact connection dimensions without production-related adjustment of connection pins are ensured here.
  • Fig. 2 shows a perspective view of the assembled carrier 10, wherein in addition to the explained with reference to FIG. 1 components 26 and 32 nor a permanent magnet 36 are inserted with a not discernible in the display lens into a matching recess 38 in the carrier 10.
  • the permanent magnet generates the magnetic field necessary for the measurement on the end face 24 of the carrier 10.
  • Fig. 3 the finished magnetic field sensor with the final outer Spritzverguss 40 is shown.
  • a polyamide material that envelops the entire carrier 10, including the ends of a connection cable 42 is suitable as the plastic for the outer encapsulation.
  • the Spritzverguss 40 also forms a connecting plate 44 with a mounting bush 46 for mounting the sensor.
  • the magnetic field generated by the permanent magnet 36 occurs at the end face 24 of the Sensor and is modulated by a sender wheel 48 in the form of a ring gear.
  • a Hall element is integrated into the sensor element 26, which registers the changes in the magnetic field generated by the permanent magnet 36 caused by the transmitter wheel 48 as measurement signals.
  • the measuring signals can then optionally be used for determining the rotational speed, the acceleration, the acceleration gradient and / or the angle of rotation of the encoder wheel 48 and fed via the connecting cable 42 to an evaluation unit, not shown.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne un détecteur de champ magnétique, en particulier un détecteur de vitesse de rotation et/ou de sens de rotation pour une roue de véhicule ou pour le train d'entraînement d'un véhicule. Le détecteur présente un support (10) de préférence réalisé sous la forme d'une pièce en matière synthétique moulée par injection pour un élément de détection (26a, b) sensible au champ magnétique et éventuellement d'autres composants (32) du détecteur qui sont mis en contact par des pistes conductrices (16a, b) du support (10) et sont englobés en même temps que le support (10) par de la matière synthétique (40). Selon l'invention, au moins l'élément de détection (26a, b) est configuré comme composant SMD, ce qui permet d'obtenir un haut degré de miniaturisation, un positionnement exact de l'élément de détection (26) et ainsi une haute précision de mesure ainsi que de nets avantages en fabrication du détecteur de champ magnétique.
PCT/EP2007/059457 2006-10-25 2007-09-10 Détecteur de champ magnétique WO2008049690A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610050177 DE102006050177A1 (de) 2006-10-25 2006-10-25 Magnetfeldsensor
DE102006050177.2 2006-10-25

Publications (1)

Publication Number Publication Date
WO2008049690A1 true WO2008049690A1 (fr) 2008-05-02

Family

ID=39100072

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/059457 WO2008049690A1 (fr) 2006-10-25 2007-09-10 Détecteur de champ magnétique

Country Status (2)

Country Link
DE (1) DE102006050177A1 (fr)
WO (1) WO2008049690A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008005315A1 (de) 2008-01-21 2009-07-23 Robert Bosch Gmbh Verfahren und Vorrichtung zur Herstellung eines Magnetfeldsensors
DE102011004447A1 (de) 2011-02-21 2012-08-23 Robert Bosch Gmbh Sensoreinheit für ein Fahrzeug
CN203011935U (zh) * 2012-09-03 2013-06-19 大陆汽车电子(长春)有限公司 轮速传感器
DE102014208425A1 (de) 2013-11-28 2015-05-28 Continental Teves Ag & Co. Ohg Verfahren zum Herstellen eines Sensors

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1586868A1 (fr) * 2004-04-13 2005-10-19 Festo AG & Co Dispositif de mesure de position avec plusieurs capteurs de champ magnétique, en particulier des capteurs Hall, disposés en file
DE102005012709A1 (de) * 2005-03-22 2006-09-28 Robert Bosch Gmbh Magnetfeldsensor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1586868A1 (fr) * 2004-04-13 2005-10-19 Festo AG & Co Dispositif de mesure de position avec plusieurs capteurs de champ magnétique, en particulier des capteurs Hall, disposés en file
DE102005012709A1 (de) * 2005-03-22 2006-09-28 Robert Bosch Gmbh Magnetfeldsensor

Also Published As

Publication number Publication date
DE102006050177A1 (de) 2008-04-30

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