DE202012009676U1 - Rotary encoder - Google Patents

Rotary encoder

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Publication number
DE202012009676U1
DE202012009676U1 DE201220009676 DE202012009676U DE202012009676U1 DE 202012009676 U1 DE202012009676 U1 DE 202012009676U1 DE 201220009676 DE201220009676 DE 201220009676 DE 202012009676 U DE202012009676 U DE 202012009676U DE 202012009676 U1 DE202012009676 U1 DE 202012009676U1
Authority
DE
Germany
Prior art keywords
rotary encoder
characterized
detector
preceding
circuit board
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 - Lifetime
Application number
DE201220009676
Other languages
German (de)
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.)
OECHSLER AG
Original Assignee
OECHSLER 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
Application filed by OECHSLER AG filed Critical OECHSLER AG
Priority to DE201220009676 priority Critical patent/DE202012009676U1/en
Publication of DE202012009676U1 publication Critical patent/DE202012009676U1/en
Expired - Lifetime legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/12Mechanical 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
    • G01D5/14Mechanical 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
    • G01D5/142Mechanical 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
    • G01D5/145Mechanical 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

Abstract

Rotary encoder (11) with a magnetic field detector (22), characterized in that a peripherally driven Detektorrad (13) is equipped with a magnet (20) and the magnetic field detector (22) as a function of the position of the magnet (20) relative to the magnetic field detector (22) delivers sinusoidal signal.

Description

  • The invention relates to a rotary encoder according to the preamble of the main claim.
  • Such a rotary encoder is from the DE 10 2011 002 563 A1 , there in combination with a torque sensor, for detecting steering wheel movements about for the electronic steering system in a motor vehicle known. In this case, a magnetic index system in the axial extension of a rotary shaft is provided as a rotary encoder, designed as mounted on a ring sequence of permanent magnets of alternating polarity, which pass through a stationary arranged sequence of at least two bistable Hall switches.
  • Such a rotary encoder has a considerable axial length, and the further disadvantage that it can not be used without constructive adjustments in different applications. Above all, its resolution is determined by the number of index magnets, so that an increase in precision leads quickly to a considerable increase in the diameter of the index ring, which counteracts the miniaturization.
  • In recognition of such circumstances, the present invention is the technical problem underlying an angular position sensor, in particular for detecting movements of functional elements such as steering or pedal movements for electric power steering, brake control or fuel supply in the motor vehicle, with increased precision of the angular resolution for more flexible applications and yet more compact and designed to be cheaper to build.
  • This object is achieved by the features specified in the main claim. Thereafter, (at least) a magnetic field detector is used which, depending on the relative passing of the field of a magnetic pole along a circular arc, delivers from its sensor an approximately sinusoidal detector signal.
  • For a Detektorrad is equipped with a magnet, preferably a rod-shaped permanent magnet. The detector wheel is externally, so indirectly, namely non-positively via a belt transmission or better form-fitting via a toothing, driven by the functional element of a device whose relative or absolute rotation angle to be detected.
  • The angle-dependent sinusoidal signal is supplied by an analogue Hall sensor in the magnetic field detector. Preferably, the pole region of a rod-shaped permanent magnet is arranged in the detector wheel and rotated with it above the magnetic field detector. The is preferably arranged stationary to be connected with its internal signal preprocessing easily to a processing and output circuit, which is arranged on a separate circuit board. In the detector wheel is axially offset from the magnetic field detector, preferably with a short engaging in a hole in the circuit board stub shaft. In addition, this support is stabilized along a bearing bore surrounding the wide annular sliding surface on the circuit board, within the range of the root circle of the Detektorrad-toothing. Against material abrasion on the circuit board, the bearing bore is equipped with a sliding sleeve, which can be easily introduced as a solder. Also, the annular sliding surface on the circuit board around the hole around can be easily tinned against abrasion; but on this larger area a more resistant gilding under the detector wheel or, preferably, on the circuit board is preferable.
  • The axially remote from the bearing bore side of the detector wheel is axially secured by a bridge mounted on the circuit board. As a bridge, a mechanical protection in the form of a housing may be provided, but then must be open on a side wall to allow the access of the external drive to the periphery of the detector wheel. For tilt-free operation of the detector wheel, it is also possible here to provide a journal bearing which engages in the bridge or in the detector wheel.
  • Additional alternatives and developments of the invention will become apparent from the other claims and, taking into account the advantages thereof, from the following description of a strongly abstracted in the drawing but enlarged to scale enlarged preferred implementation example of the invention. The sole figure of the drawing shows the radially cut rotary encoder in axonometric view.
  • The inventively designed rotary encoder 11 is on a device 12 mounted with a (not shown) functional element whose instantaneous or changing movement is to be detected or monitored. For this is in this implementation example, a Detektorrad 13 with a peripheral toothing 14 , in particular a crown or end gearing 14 , fitted. It does not have to wrap around, it can also be limited to an angle range in which the rotary encoder 11 should work.
  • For its storage engages the created in plastic injection molding detector wheel 13 with a molded stub shaft 15 into a hole 16 in an approximately made of reinforced epoxy resin circuit board 17 one. An abrasion as possible preventing sliding bushing 18 can simply by covering the hollow cylindrical wall of the hole 16 be realized with solder. This tinning can also affect the sliding ring area 19 extend along which the Detektorrad 13 within the root circle of his gearing 14 on the circuit board 17 rests. This surface area 19 - Or the axially against it adjacent surface of the detector wheel 13 - But is preferably metallized, such as gold plated.
  • A magnet 20 , preferably a permanent magnet, is radially or diametrically in the detector wheel 13 used and held non-positively or cohesively, preferably glued. The magnet 20 can be designed to be axially short and to the axis of rotation 21 the detector wheel 13 be oriented in parallel; but preferably it is, as outlined, a transversely to the axis of rotation 21 oriented rod-shaped permanent magnet 20 , Due to the rotation of the detector wheel 13 sweeps the field of the magnet 20 circular arc over a magnetic field detector 22 away, the, the detector wheel 13 axially opposite, under the circuit board 17 is mounted. It can be equipped with a signal pre-processing, by the way, the signal processing takes place in one on the circuit board 17 connected circuit (not shown in the drawing).
  • The magnetic field detector 22 has as sensor preferably a Hall element 24 on. This provides a velocity-independent voltage whose amplitude is sinusoidal in accordance with the sweeping magnetic field. The of the circuit on the circuit board 17 processed and output instantaneous voltage is thus dependent on the just achieved rotation angle.
  • When the rod-shaped magnet 20 how outlined the detector wheel 13 penetrates diametrically, the magnetic field detector can 23 be arranged diametrically opposite in the second such that serves about the function control and redundancy. An angularly offset additional magnetic field detector allows a direction of rotation determination via the evaluation of the mutual offset of the voltage profiles.
  • To axial fuse, the circuit board 17 opposite, the detector wheel becomes 13 at a small axial distance from a box-like bridge 25 spanned by means of approximately molded pins 26 on the circuit board 17 is positionable. However, a side wall must remain open so that the external drive on the teeth 14 the detector wheel 13 can access. For a tilting torque-free mounting of the detector wheel 13 can between him and the bridge 25 a short journal bearing 27 be provided, as in the sketch above the magnet 20 indicated.
  • By means of screws 28 becomes the circuit board 17 of the rotary encoder 11 , while also clamping the bridge 25 , so on the device 12 Applies to a rack or gear with the toothing 14 the detector wheel 13 engaged (not shown in the sketch). About his in the device 12 engaging pins 26 will also be the bridge 25 relative to the device 12 aligned. The magnetic field detector emerges 22 in a recess 29 in the device 12 to not from the bottom of the thin circuit board 17 to be admitted.
  • A rotary encoder 11 Thus, according to the invention, in accordance with the invention, a continuous detection of steering or pedal movements in a motor vehicle preferably has a Hall element 24 equipped, therefore, a sinusoidal signal supplying magnetic field detector 22 in the sphere of influence of a preferably diametrically permanently magnet-equipped, externally driven detector wheel 13 on, that, on a circuit board 17 from a bridge 25 overrun, with a stub shaft 15 in a tinned hole 16 in the circuit board 17 engages and within the root circle of a Detektorrad-toothing 14 on a gilded sliding ring area 19 on the circuit board 17 rests.
  • LIST OF REFERENCE NUMBERS
  • 11
    Rotary encoder (with 13 . 17 and 22 , For 12 )
    12
    Device (equip with 11 )
    13
    Detector wheel (from 11 )
    14
    Toothing (on 11 )
    15
    Stub shaft (an 13 )
    16
    Bore (in 17 , For 15 )
    17
    PCB (from 11 )
    18
    Socket (in 16 )
    19
    Sliding ring area (within 14 on 17 , under 13 )
    20
    Magnet (on 13 )
    21
    Rotary axis (from 13 )
    22
    Magnetic field detector (under 17 - 13 )
    23
    24
    Hall element (in 22 )
    25
    Bridge (over 13 , on 17 )
    26
    Pins (on 25 , in 17 )
    27
    Journal bearing (between 13 and 25 )
    28
    Screws (from 25 / 17 to 12 )
    29
    Recess (in 12 For 11 )
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 102011002563 A1 [0002]

Claims (10)

  1. Rotary encoder ( 11 ) with a magnetic field detector ( 22 ), characterized in that a peripherally driven detector wheel ( 13 ) with a magnet ( 20 ) and the magnetic field detector ( 22 ) depending on the position of the magnet ( 20 ) relative to the magnetic field detector ( 22 ) provides sinusoidal signal.
  2. Rotary encoder according to the preceding claim, characterized in that the magnetic field detector ( 22 ) with a Hall element ( 24 ) is equipped.
  3. Rotary encoder according to one of the preceding claims, characterized in that the detector wheel ( 13 ) with an orthogonal to its axis of rotation ( 21 ) oriented rod-shaped permanent magnets ( 20 ) is equipped.
  4. Rotary encoder according to one of the preceding claims, characterized in that the magnetic field detector ( 22 ) under a printed circuit board ( 17 ) and the detector wheel ( 13 ) on the printed circuit board ( 17 ) is rotatable.
  5. Rotary encoder according to the preceding claim, characterized in that the detector wheel ( 13 ) with a stub shaft ( 15 ) into a hole ( 16 ) in the printed circuit board ( 17 ) and on a sliding ring area ( 19 ) on the printed circuit board ( 17 ) rests.
  6. Rotary encoder according to the preceding claim, characterized in that the bore ( 16 ) with a socket ( 18 ) is made of tin.
  7. Rotary encoder according to the preceding claim, characterized in that the tin also extends over the sliding ring region ( 19 ).
  8. Rotary encoder according to one of the preceding claims, characterized in that the detector wheel ( 13 ) from one on the printed circuit board ( 17 ) positioned bridge ( 25 ) is overrun.
  9. Rotary encoder according to the preceding claim, characterized in that between the bridge ( 25 ) and the detector wheel ( 13 ) a journal bearing ( 27 ) is trained.
  10. Rotary encoder according to one of the preceding claims, characterized in that the printed circuit board ( 17 ) including the bridge ( 25 ) on the device ( 12 ) is screwed, with immersion of the magnetic field detector ( 22 ) in a device recess ( 29 ) and engagement of the Detektorrad-toothing ( 14 ) in the toothing of a functional element of the device ( 12 ).
DE201220009676 2012-10-10 2012-10-10 Rotary encoder Expired - Lifetime DE202012009676U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201220009676 DE202012009676U1 (en) 2012-10-10 2012-10-10 Rotary encoder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201220009676 DE202012009676U1 (en) 2012-10-10 2012-10-10 Rotary encoder

Publications (1)

Publication Number Publication Date
DE202012009676U1 true DE202012009676U1 (en) 2014-01-13

Family

ID=50029798

Family Applications (1)

Application Number Title Priority Date Filing Date
DE201220009676 Expired - Lifetime DE202012009676U1 (en) 2012-10-10 2012-10-10 Rotary encoder

Country Status (1)

Country Link
DE (1) DE202012009676U1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011002563A1 (en) 2010-12-20 2012-06-21 Robert Bosch Gmbh Sensor arrangement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011002563A1 (en) 2010-12-20 2012-06-21 Robert Bosch Gmbh Sensor arrangement

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R079 Amendment of ipc main class

Free format text: PREVIOUS MAIN CLASS: G01P0003487000

Ipc: G01B0007300000

R207 Utility model specification

Effective date: 20140220

R163 Identified publications notified
R163 Identified publications notified

Effective date: 20141031

R150 Term of protection extended to 6 years
R157 Lapse of ip right after 6 years