WO2014202065A1 - Roue polaire à modification de l'angle de champ améliorée - Google Patents

Roue polaire à modification de l'angle de champ améliorée Download PDF

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Publication number
WO2014202065A1
WO2014202065A1 PCT/DE2014/200173 DE2014200173W WO2014202065A1 WO 2014202065 A1 WO2014202065 A1 WO 2014202065A1 DE 2014200173 W DE2014200173 W DE 2014200173W WO 2014202065 A1 WO2014202065 A1 WO 2014202065A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
pole
track
sensor
wheel
Prior art date
Application number
PCT/DE2014/200173
Other languages
German (de)
English (en)
Inventor
Benjamin Kaufner
Original Assignee
Schaeffler Technologies Gmbh & Co. Kg
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 Schaeffler Technologies Gmbh & Co. Kg filed Critical Schaeffler Technologies Gmbh & Co. Kg
Publication of WO2014202065A1 publication Critical patent/WO2014202065A1/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
    • G01D5/244—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 characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—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 characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders

Definitions

  • the invention relates to a pole wheel comprising a preferably disc-shaped carrier with at least one track of alternately arranged magnetic north and south poles.
  • the invention further relates to a sensor system for measuring the rotational speed of a rotatable component comprising such a pole wheel.
  • Pole wheels can be used as speed or angle encoders.
  • a typical field of application is electric drives for vehicles.
  • So Polröder are used in the angular and commutation sensors to generate signals depending on the rotational movement of a component.
  • Pole wheels for example, often used as a signal generator for ABS and speed sensors.
  • Pole wheels comprise a disc or annular carrier having at least one track of north and south magnetic potentials. The magnetic poles serve as a measure and can be scanned contactlessly with magnetic field sensors.
  • WO 2012038169 A1 shows a sensor system for rotational measurement of a rotatable machine element, in particular a wheel hub, with a signal transmitter and a first and a second sensor.
  • the Signalgebor is coupled to the rotatable machine element and arranged concentrically to the axis of rotation and has in the circumferential direction alternating alternating information areas of two different types.
  • the first sensor interacts with an information area and the second sensor interacts with a boundary area of two adjacent information areas.
  • An information area of first arithmetic is preferably as magnetic positive pole and an information area of the second kind designed as a magnetic negative pole.
  • the Winkelmosseinrlch- device comprises a support body having a first designed as a circular ring magnetic track and a second formed as Zylinderma tel specification track. Each track can be scanned by at least one electromagnetic sensor.
  • DE 102 10 372 A1 describes a rotational angle sensor with a disc-shaped carrier of a first track of magnetic north and south poles and a second track of magnetic north and south poles with a different number of north and south poles of the first track and each with a sensor element for detecting the first and second lanes.
  • a first coarse detection of the rotation angle of the track carrier is carried out after the start of the rotation angle sensor, and a high-resolution detection of the rotation angle is realized with the second track.
  • the sinusoidal signal of the rotation angle sensor is linearized by applying an angle function.
  • the pole wheels used in the prior art naturally have non-linear characteristics of their field reliability relative to the pole wheel position. Insofar as only the angular position of the pole wheel has to be recorded with an accuracy which approximately corresponds to the distance between adjacent poles, the pulses produced by the poles on the sensor can be evaluated. In particular, if the position between two adjacent poles is to be determined more accurately, the evaluation of the non-linear characteristics presents considerable difficulties.
  • the object of the present invention is to provide a pole wheel whose magnetic field offers a sensor, which evaluates the FekJraum or strength, the most linear field angle change per Polradwindung. Furthermore, a sensor system for measuring the speed, soft such a flywheel used to be provided. To solve the problem, a pole wheel according to the appended claim 1 is used.
  • the pole wheel according to the invention zelchnel characterized in that each magnetic pole is provided with a respective magnetic return, which magnetically separates the pole from the respective Nachbarpol.
  • a sensor used for scanning the track of the pole wheel thus provides an approximately linear sensor signal, which is much more robust and reacts equally to tolerance fluctuations in the entire measuring range. Since the sensor according to the invention already has a linear signal, eliminates the previously required, complex linearization of the sensor signal, which is not least also very cost-effective.
  • the magnetic yoke is preferably designed as a ferromagnetic flux guide.
  • the magnetic inference between the poles has a width of 25% to 30% of the width of a magnetic pole. Furthermore, it has proven to be expedient if the magnetic return has a thickness of 100% to 120% of the thickness of a magnetic pole. These figures represent optima values determined in field tests with a pole wheel with 20 magnetic north poles and 20 magnetic south poles. Differently dimensioned magnetic conclusions are of course possible. Thus, for more or fewer than 20 magnetic pole pairs, other dimensions for the magnetic returns can be useful.
  • the pole can be designed as a radial pole.
  • the track of the magnetic north and south poles is designed as a cylinder jacket surface.
  • the track has a radial effective direction and can be queried radially by means of a magnetic sensor.
  • the pole wheel can be designed as an axial pole wheel.
  • Axial Poltate have a trained as a cylinder surface surface track magnetic north and south poles.
  • the track has an axial effective direction and can be queried axially by means of a magnetic sensor.
  • the pole wheel has more than one track magnetic north and south poles aut Vietnamese. It can be formed with radial or axial direction of action multiple tracks. Likewise, a combination of tracks with radial and axial effective direction is possible. In these embodiments, in turn, each magnetic pole has a magnetic inference.
  • a rotation angle sensor according to the appended claim 10 is also used. sens r umtassi the already described pole wheel and at least one magnetic field sensor for scanning the track of the pole wheel.
  • FIGS. Show it;
  • Fig. 1 an inventive sensor system for speed measurement In a
  • Fig. 1 shows an inventive sensor system for Drohiere Weghoff horr in a Operaansteht from above.
  • the sensor system 01 according to the invention comprises a pole wheel 02 and a magnotfold sensor 03.
  • the pole wheel 02 consists of a disk-shaped carrier 04 which has a track 05 of alternatingly arranged magnetic north and south poles formed as a cylinder jacket surface.
  • a pole 02 with such arranged magnetic north and south poles is referred to as a radial pole 02, since the magnetic material is applied radially on the carrier 04 and thus has a radial direction of action.
  • Each magnetic pole is provided with a magnetic yoke 07, which separates the pole from the respective neighboring pole.
  • the magnetic conclusions 07 are preferably designed as ferromagnelische Flussleit Publishede. These flux guides preferably grasp the magnetic pole on all sides, except for the surface which is directly opposite the magnetic field sensor 03 and is to be detected by it.
  • Each magnetic yoke 07 is preferably dimensioned such that it forms a material web between the poles with a width of 25% to 30% of the width of a magnetic pole, which extends between two material webs.
  • a bottom surface of the yoke 07, which is below the magnetic pole preferably has a thickness of 100% - 120% of the thickness of a magnetic pole.
  • the magnetic yoke 07 encloses the individual poles pocket-like and is preferably constructed as a ring with radially outwardly projecting webs, which lie between the individual poles. This embodiment of the magnetic conclusions 07 has proved to be particularly favorable when using 20 magnetic north poles and 20 magnetic south poles (20 pole pairs).
  • the magnetic field sensor 03 embodied, for example, as a Hall sensor is aligned radially with respect to the pole wheel 02 in order to be able to scan the track 05 radially.
  • the track 05 magnetic north and south poles may be formed as a circular ring surface.
  • Such pole wheels 02 are referred to as axial pole wheels 02.
  • axial Polrädem 02 is the magnetic material axially applied to the carrier 04 and thus has an axial direction of action.
  • the magnetic field sensor 03 is in turn positioned accordingly, that is aligned in this case axially to the flywheel 02 in order to scan axially.
  • Fig. 1 and the magnetic field of Polrados invention 02 is shown.
  • the magnetic field of the pole wheel 02 according to the invention is optimized so that it provides the magnetic field sensor 03 an approximately linear field angle change per Polradwindung.
  • the hitherto required, subsequent computational ünearmaschinetician the sensor signal can be omitted.
  • a sensor system 01 according to the prior art is shown in a partial view from above in FIG.
  • the previously known Sensoryslems 01 comprises om radial flywheel 02 with a carrier 04, on which a track 05 is applied by alternately arranged magnetic north and south poles. and a magnetic field sensor 03.
  • the previously known PoJrad 02 has no magnetic conclusions.
  • the resulting magnetic field of the prior art pole wheel 02 provides the magnetic field sensor 03 with a non-linear field angle change in the Polrad loftung between adjacent poles.
  • To achieve a linear Signafvertanks detected by the magnetic field sensor 03 signal must be subsequently computationally computationally Linearlsiert.
  • the differences in the sensor signal obtained according to the invention and the sensor signal obtained in the prior art will be explained in more detail below with reference to FIGS. 3 to 8.
  • FIG. 3 shows a diagram for the vectorial representation of the magnetic flux density in the air gap in the case of a pole pair of a pole wheel 02 according to the invention.
  • both axes are spatial axes.
  • the representation thus corresponds to the detection image of the magnetic field sensor, which looks radially onto an axially magnetized pole wheel 02, wherein the x axis exactly corresponds to the distance.
  • a s pole pair is mapped (ie 18 mechanical angular degrees when using 20 pole pairs) and the y axis depicts the air gap in mm, which is 2.5 mm in the exemplary embodiment shown.
  • the vectors represent the direction and magnitude of the magnetic flux density at the measuring distance of the magnetic field sensor 03.
  • the angle of the vectors is processed by the magnetic field sensor 03 to the sensor output signal.
  • FIG. 4 shows a diagram for the representation of the signals supplied by the magnetic field sensor of the sensor system according to the invention.
  • the type and catfish shown how the magnetic sensor 03 generates its output signal proportional to the angle:
  • the magnetic field sensor 03 interprets two perpendicular components of the flux density (see Fig. 3) as sine and Cosine and then applies the arctangent function (arctan2).
  • FIG. 5 contains a diagram for illustrating the linearization error of the sensor system according to the invention. It is assumed that the Idoalfall that over a pair of poles a straight output line from - ⁇ to ⁇ should be issued. In Fig. 5, the difference of the simulated sensor output signal to these ideals, based on the total value is shown. In addition to the nominal air gap (2.5 mm), see curve a. the curves b and c show the air gap errors ⁇ 0,5 mm. Curve a shows a relatively flat course and thus has only a relatively small deviation from the ideal case. Subsequent linearization can therefore be dispensed with.
  • FIGS. 6 to 8 show the same facts as in FIGS. 3 to 5 relative to a rotor or a sensor system according to the prior art.
  • FIG. 8 shows a diagram for illustrating the unearthing error of the sensor system according to the prior art.
  • Curve a again refers to an air gap of 2.5 mm.
  • Curve b to an air gap of 2.0 mm and curve c to an air gap of 3.0 mm. All curves a, b and c show clear deviations from the ideal case (ge). rado output line). In any case, a subsequent delocalisation is required if the Sonsors signal is to be used to determine the position between two poles.

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

Abstract

L'invention concerne une roue polaire (02) pourvue d'un support (04) en forme de disque qui comporte au moins une piste (05) de pôles magnétiques nord et sud disposés en alternance. La roue polaire selon l'invention est caractérisée en ce que chaque pôle magnétique est doté d'un circuit magnétique de fermeture (07) qui sépare le pôle magnétiquement du pôle voisin respectif. L'invention concerne également un système de capteur servant à mesurer la vitesse d'un composant rotatif qui comprend une telle roue polaire (02), ainsi qu'au moins un capteur de champ magnétique (03) servant à explorer la piste (05) de la roue polaire (02).
PCT/DE2014/200173 2013-06-21 2014-04-16 Roue polaire à modification de l'angle de champ améliorée WO2014202065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013211797.3A DE102013211797A1 (de) 2013-06-21 2013-06-21 Polrad mit verbesserter Feldwinkeländerung
DE102013211797.3 2013-06-21

Publications (1)

Publication Number Publication Date
WO2014202065A1 true WO2014202065A1 (fr) 2014-12-24

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PCT/DE2014/200173 WO2014202065A1 (fr) 2013-06-21 2014-04-16 Roue polaire à modification de l'angle de champ améliorée

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DE (1) DE102013211797A1 (fr)
WO (1) WO2014202065A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016225126A1 (de) 2016-12-15 2018-06-21 Zf Friedrichshafen Ag Drehzahlbestimmung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123562A (en) * 1982-07-05 1984-02-01 Inoue Japax Res Magnetic encoder system
JPH06109414A (ja) * 1992-09-28 1994-04-19 Mazda Motor Corp 回転センサのロータ及びその製造方法
JP2001255336A (ja) * 2000-03-13 2001-09-21 Nsk Ltd 回転状態検出用エンコーダ及び回転状態検出用エンコーダ付転がり軸受ユニット
DE10210372A1 (de) 2002-03-08 2003-09-25 Siemens Ag Drehwinkelsensor mit hoher Winkelauflösung
JP2006322779A (ja) * 2005-05-18 2006-11-30 Toyota Motor Corp ロータおよびモータ
DE102004010948B4 (de) 2004-03-03 2008-01-10 Carl Freudenberg Kg Winkelmesseinrichtung
WO2012038169A1 (fr) 2010-09-21 2012-03-29 Schaeffler Technologies AG & Co. KG Système de capteur et procédé de mesure de vitesse de rotation incrémentielle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59410163D1 (de) * 1993-12-22 2002-09-05 Continental Teves Ag & Co Ohg Vorrichtung zur erfassung von dreh- oder winkelbewegungen
DE102004046772A1 (de) * 2004-09-24 2006-03-30 Volkswagen Ag Sensorvorrichtung zur Erfassung der Drehung einer Welle in einem Fahrzeug

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123562A (en) * 1982-07-05 1984-02-01 Inoue Japax Res Magnetic encoder system
JPH06109414A (ja) * 1992-09-28 1994-04-19 Mazda Motor Corp 回転センサのロータ及びその製造方法
JP2001255336A (ja) * 2000-03-13 2001-09-21 Nsk Ltd 回転状態検出用エンコーダ及び回転状態検出用エンコーダ付転がり軸受ユニット
DE10210372A1 (de) 2002-03-08 2003-09-25 Siemens Ag Drehwinkelsensor mit hoher Winkelauflösung
DE102004010948B4 (de) 2004-03-03 2008-01-10 Carl Freudenberg Kg Winkelmesseinrichtung
JP2006322779A (ja) * 2005-05-18 2006-11-30 Toyota Motor Corp ロータおよびモータ
WO2012038169A1 (fr) 2010-09-21 2012-03-29 Schaeffler Technologies AG & Co. KG Système de capteur et procédé de mesure de vitesse de rotation incrémentielle

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