EP3596812A1 - Ec-motor mit einem ringförmigen sensormagneten - Google Patents
Ec-motor mit einem ringförmigen sensormagnetenInfo
- Publication number
- EP3596812A1 EP3596812A1 EP18708661.6A EP18708661A EP3596812A1 EP 3596812 A1 EP3596812 A1 EP 3596812A1 EP 18708661 A EP18708661 A EP 18708661A EP 3596812 A1 EP3596812 A1 EP 3596812A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring magnet
- magnetic field
- electronically commutated
- field sensor
- commutated motor
- 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.)
- Withdrawn
Links
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 7
- 230000005415 magnetization Effects 0.000 claims description 32
- 230000005355 Hall effect Effects 0.000 claims description 3
- 230000004907 flux Effects 0.000 description 26
- 238000010586 diagram Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the invention relates to an electronically commutated motor with a permanent magnet rotor having a rotor shaft and is coaxially surrounded by a stator having at least one stator winding, wherein the rotor shaft defines a rotation axis of the permanent magnet rotor and is rotatably mounted in at least two bearing points, which in Longitudinal direction of the rotation axis are spaced from each other.
- Magnetic pill mounted over the axially spaced on a circuit board, a surface mounted magnetic field sensor is mounted.
- the sensor e.g. two laterally magnetically sensitive semiconductor elements installed perpendicular to each other, so that the orientation of the magnetic field sensor to the magnetic pellet and thus the rotational position of the rotor shaft via a sine and a cosine output of the magnetic field sensor can be clearly determined.
- This method of angular position detection can not be used if the shaft ends of the rotor shaft are damaged due to an underlying EC Motor application are not freely accessible and the surface normal of the circuit board for reasons of space must be oriented perpendicular to the rotor axis, since the low cost, marketable sensors are not able to detect magnetic fields whose field lines perpendicular to the silicon plane, ie the chip level of the magnetic field sensor.
- a printed circuit board carrying a magnetic field sensor can not be aligned with conventional sensor magnets within the EC motor such that the surface normal of the printed circuit board is perpendicular to the longitudinal central axis the rotor shaft runs.
- the invention relates to an electronically commutated motor with a permanent-magnet rotor, which has a rotor shaft and is coaxially surrounded by a stator having at least one stator winding, wherein the rotor shaft defines a rotation axis of the permanent-magnet rotor and is rotatably mounted in at least two bearing points, which are spaced apart in the longitudinal direction of the axis of rotation.
- a ring magnet is arranged whose magnetization is formed near the surface in the region of an end face of the ring magnet oriented perpendicular to the axis of rotation and which is designed for radially oriented and continuous rotor position detection by means of at least one associated magnetic field sensor.
- the magnetization preferably has at least one north pole, which is at least substantially circular-sector-shaped, and at least one south pole, which is at least substantially circular-sector-shaped.
- a four-pole design of the ring magnet ie, each with two north and south poles, which are alternately formed circumferentially, is suitable, for example, for a rotor position detection of an electronically commutated motor whose rotor is equipped with four pole pairs.
- the terms "South Pole” and "North Pole” in the context of the description do not define any geometrically sharply defined regions, but rather represent a maximum value of the flux density or the magnetic field strength in this region.
- the at least one north pole and the at least one south pole are each formed circumferentially at least in regions in the end face of the ring magnet oriented perpendicular to the axis of rotation.
- the ring magnet is formed in the axial direction at least partially hollow cylindrical or toroidal.
- the magnetic field sensor is positioned tangentially to an outer circumferential surface of the ring magnet, wherein a predetermined radial distance between the magnetic field sensor and the outer circumferential surface of the ring magnet is smaller than half of an axial height of the ring magnet.
- the magnetic field sensor is arranged axially off-center to an axial center plane of the ring magnet.
- the uniqueness of the rotor position detection or an absolute rotation angle detection of the rotor shaft of the electronically commutated motor for optimal control of the coils of the at least one stator winding can be realized.
- the magnetic field sensor is preferably a Hall-effect sensor or a magnetoresistive sensor.
- the magnetic field sensor is plate-shaped and positioned parallel to an electrical circuit board.
- the axial height of the ring magnet is preferably sized larger than an outer diameter of the ring magnet.
- a disk-shaped hub region is substantially free of magnetization, and a base portion of the ring magnet lying axially below the end face is magnetized at least substantially tangentially.
- FIG. 1 is a schematic plan view of an electronically commutated motor with the magnetic field sensor
- FIG. 2 is a schematic longitudinal section along the section line II-II of Fig. 1,
- FIG. 3 shows a schematic view of the rotor shaft with the two-pole magnetized ring magnet and the magnetic field sensor of FIG. 1 and FIG. 2,
- FIG. 4 is a developed view of the ring magnet of FIG. 3 during magnetization, FIG.
- FIG. 5 in accordance with the magnetization. 4 resulting magnetization in the case of the unwound representation of the ring magnet of FIG. 4, with an thereby resulting, approximately "garland-shaped" magnetic course of the magnetic flux density field lines and a detection plane of the magnetic field sensor, FIG.
- FIG. 6 is a perspective view of the ring magnet of FIG. 5 with a representative magnetic flux density field line.
- FIG. 7 shows a section of the unwound outer circumferential surface of the ring magnet with the basic course of the magnetic field lines according to FIG. 1 to FIG. 6, which adjusts as a result of the magnetization of the ring magnet;
- FIG. 8 shows a four-pole magnetization of the ring magnet of FIG. 3, FIG.
- FIG 9 shows a diagram with the respective magnetic flux density B acting on the magnetic field sensor as a function of the respective rotational angle ⁇ of the rotor shaft or of the "unwound path" of the outer circumferential surface of the ring magnet
- FIG 10 shows a diagram with the respective magnetic flux density B acting on the magnetic field sensor as a function of the respective rotational angle ⁇ of the rotor shaft or of the "unwound path" of the outer peripheral surface of the ring magnet.
- Fig. 1 shows an electronically commutated motor 100, which is preferably designed to be axially flat design and is hereinafter consistently referred to by the term "EC motor”.
- This preferably comprises at least one permanent-magnet rotor 120 with a cylindrical rotor shaft 122 which is coaxially surrounded by a stator 140 with at least one stator winding 142.
- the rotor shaft 122 has an axis of rotation 130 and is illustratively rotatably received in first and second bearing points 124, 126.
- the two bearing points 124, 126 are axially spaced from each other and in this case preferably positioned on both sides of the rotor 120 and the at least one stator winding 142.
- a ring magnet 150 is preferably arranged non-rotatably whose magnetization 152 according to an embodiment near the surface as well as peripherally in the region of an oriented perpendicular to the rotation axis 130 annular end face 154 of the ring magnet 150 is formed.
- the ring magnet 150 is preferably designed for radially oriented, continuous and preferably absolute position detection or measurement of a rotational angle ⁇ of the rotor 120 by means of at least one associated magnetic field sensor 200.
- the magnetic field sensor 200 is for this purpose on an electrical
- a rectangular coordinate system 170 with an x-axis, a y-axis and z-axis illustrates the relative position of all components in space, with the printed circuit board 202 extending parallel to the xy plane spanned by the coordinate system 170, including the magnetic field sensor 200 ,
- FIG. 2 shows the magnetization 152 of the ring magnet 150 of FIG. 1, which is preferably essentially formed by a north pole N with a circular sector shape and a south pole S which is circular-sector-shaped and which here are semicircular only by way of example.
- a central hub region 158 of the ring magnet Neten 150 preferably remains substantially free of any magnetization 152.
- the north pole N and the south pole S are each formed in the end face 154 of the ring magnet 150 oriented orthogonally to the axis of rotation 130 of the rotor shaft 122.
- a base portion 156 directed away from the end face 154 of the ring magnet 150, ie directed downward in FIG. 1, is magnetized at least substantially tangentially and serves for the field line termination of the magnetization 152.
- the arranged on the circuit board 202 preferably plate-shaped or cuboid magnetic field sensor 200 is positioned in a parallel to the z-axis of the coordinate system 170 distance from RA to an outer circumferential surface 160 of the rotor shaft 122 rotatably mounted ring magnet 150.
- the ring magnet 150 is preferably hollow cylindrical, as shown here only by way of example, but alternatively may also have a toroidal geometry. Of importance for the quality of rotor position detection is that the field lines of the magnetic field generated by the ring magnet 150 in the region of the magnetic field sensor 200 as parallel as possible to the XY plane of the coordinate system 170 and also enforce the magnetic field sensor 200 in the ideal case exclusively parallel.
- FIG. 3 shows the rotor shaft 122 with the rotation axis 130 of FIG. 1, on which the ring magnet 150 of FIG. 1 and FIG. 2 is arranged non-rotatably by means of the preferably at least largely unmagnetized hub region 158.
- An axial height h of the ring magnet 150 corresponds here only by way of example and without limiting the inventive generality about a radial width RB of the preferably near-surface magnetization 152 of the ring magnet 150 with the respective sector-shaped north and south pole N, S.
- the magnetic field sensor 200 for rotor position detection or for measuring the absolute rotation angle ⁇ of the rotor shaft 122 arranged on the printed circuit board 202 of FIG. 2 is preferably positioned in the radial distance RA to the cylindrical outer jacket surface 160 of the ring magnet 150 in space.
- Point-shaped, magnetically sensitive measuring zone 204 of the magnetic field sensor 200 is arranged to achieve optimum rotor position detection at an axial distance ⁇ h or offset to an axial center plane 162 of the ring magnet 150. This means that the magnetic field sensor 200 is approximately at the axial height of a peripheral edge 164 of the end face
- the distance RA is preferably less than half the axial height h of the ring magnet 150.
- the magnetic field sensor 200 may be realized, for example, with a Hall effect sensor or with a magnetoresistive sensor.
- the coordinate system 170 illustrates the position of the individual components relative to one another in space.
- FIG. 4 shows the ring magnet 150 of FIG. 3 during magnetization.
- a developed in the plane of (total) circumferential length of the ring magnet 150 and the outer circumferential surface 160 thereof is preferably TT-DA, wherein the
- a "girland-shaped" profile of the magnetic flux density according to the invention is generated, which is indicated here only schematically with a field line 300.
- Fig. 5 shows that in accordance with the magnetization. 4 resulting in an approximately "garland-shaped" magnetic course of the magnetic flux density field line and a detection plane of the magnetic field sensor 200 of FIG. 1 and FIG. 2.
- the unwinding of the outer circumferential surface 160 of the ring magnet 150 has the circumferential length
- a detection plane 210 in which the measurement zone of the magnetic field sensor (see reference numerals 200, 204 in FIG. 3) does not extend within the center plane 162 of the ring magnet 150 is an absolute rotor position detection or unique measurement of the current rotation angle of the ring magnet To enable rotor.
- the base portion 156 of the ring magnet 150 remains predominantly at least comparatively weak and magnetized substantially tangentially.
- FIG. 6 shows the ring magnet 150 of FIG. 5 having a representative magnetic flux density field line. Near the surface in the area of the front side 154 of the
- Ring magnet 150 the magnetization 152 is formed with the circular sector-shaped north pole N and the circular sector-shaped south pole S, wherein the resulting flux density by means of a representative field line 300 is shown only schematically.
- the respective circular-sector-shaped north and south pole N, S each extend circumferentially over about 180 °. Due to the largely magnetization-free hub region 158, which is coaxially enclosed by the outer circumferential surface 160, a cylindrical passage bore 166 for attachment of the ring magnet 150 to the rotor shaft of the electronically commutated motor 100 of FIG. 1 runs centrally to the longitudinal central axis 130.
- FIG. 7 shows a section of the unwound outer circumferential surface 160 of the ring magnet 150 of FIG. 4 with the basic profile of the magnetic field lines as a result of the magnetization of the ring magnet 150 according to FIGS. 2 to 6.
- the north pole N and the south pole S are preferred essentially only in the region of a near-surface magnetization zone 168 of the front side 154 of the ring magnet 150, which discloses the considerably higher density of the field lines 300 of the magnetic flux density in this zone.
- the invention "garland-shaped" course of the field lines 300 gem. Fig. 4 in each case starting from the end face 154 shown.
- the course of the field lines 300 of the north and south poles N, S corresponds, for example, approximately to a family of six sine half-waves or cosine waves.
- Half waves with disproportionately increasing amplitude across the longitudinal direction The outer circumferential surface 160 of the ring magnet 150.
- the field lines 300 in this case extend partially outside the ring magnet 150, whose outer circumferential surface 160 has the axial height h.
- the magnetization zone 168 is adjoined in the axial direction by the largely at least comparatively weak and substantially tangentially magnetized base section 156 of the ring magnet
- the base section 156 which is extensively magnetized at least comparatively weakly and substantially tangentially, serves to complete the field magnetization 152.
- corresponding flux density signals "tangentially” and “axially” outside the ring magnet 150 are as a rule asymmetric as being usable: a corresponding axial field component is almost completely absent.
- FIG. 8 shows an alternative, four-pole magnetization 180 of the ring magnet 150 of FIG. 3.
- the magnetization 180 of the ring magnet 150 preferably has two north poles N and two south poles S, two south-pole poles S as well as two north pole N each in a circle sector shape diametrically as well as near the surface in the region of
- Front side 154 of the ring magnet 150 are formed.
- the north and south poles N, S preferably each extend over a range of about 90 °.
- the axial through bore 166 extends through the hub portion 158 of the ring magnet 150.
- the magnetization 180 is particularly suitable for rotor position sensing of an EC motor with a four pole, permanent magnet rotor.
- FIG. 9 shows a diagram with the respective magnetic flux density B acting on the magnetic field sensor 200 of FIG. 2 as a function of the respective rotational angle ⁇ of the rotor shaft 122 of FIG. 2 and of the "unwound path" of FIG
- the six smooth, approximately sinusoidal curves B x i 6 represent the course of a peripheral component B x of the magnetic flux density B generated by the ring magnet 150 as a function of the respective rotor position or the absolute rotation angle ⁇ of the Rotor 120 of FIG. 1, in each case depending on the distance RA of the magnetic field sensor 200 from the upper circumferential edge of the ring magnet 150.
- the magnetic flux density in the region of the magnetic field sensor 200 decreases as the distance increases.
- the distance RA of 3.75 mm permits a clear measurement of the angle of rotation ⁇ or the resolution of the so-called "sine wave".
- FIG. 10 shows a diagram with the respective magnetic flux density B acting on the magnetic field sensor 200 of FIG. 2 as a function of the respective rotational angle ⁇ of the rotor shaft 122 of FIG. 2 and of the "unwound path" of the outer circumferential surface 160 of the ring magnet 150 of FIG 4.
- Fig. 10 corresponds - except for the scaling of the flux density B on the vertical axis - substantially to the diagram of Fig. 9, wherein between the peripheral components B X7 10 and the axial components B y7 , ... io the
- the optimum distance RA is 3.75 mm, since both components B X7 and B Y7 of the flux density B are maximal and no undesired sine-cosine ambiguity occurs.
- the ripples, ie the harmonic content of the curves B y7 ,..., Io decreases with increasing distance RA, so that the curves B y7 ,... Io always become more sinusoidal, although the strength of the flux density B also significantly reduced.
- the EC motor according to the invention with a rotor position detection by means of magnetic field sensing by a surface magnetization-magnetized ring magnet or a torus magnet and a magnetic field sensor is particularly suitable for axially flat-mounted drives, such as in motor vehicles as Wegversteller, windows, sunroof actuators, Tailgate plate, door closer, windscreen wipers, etc. find application.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Brushless Motors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017204415.2A DE102017204415A1 (de) | 2017-03-16 | 2017-03-16 | EC-Motor mit einem ringförmigen Sensormagneten |
PCT/EP2018/055044 WO2018166806A1 (de) | 2017-03-16 | 2018-03-01 | Ec-motor mit einem ringförmigen sensormagneten |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3596812A1 true EP3596812A1 (de) | 2020-01-22 |
Family
ID=61563387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18708661.6A Withdrawn EP3596812A1 (de) | 2017-03-16 | 2018-03-01 | Ec-motor mit einem ringförmigen sensormagneten |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3596812A1 (de) |
CN (1) | CN110383652A (de) |
DE (1) | DE102017204415A1 (de) |
WO (1) | WO2018166806A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111226384B (zh) * | 2017-10-25 | 2022-07-05 | 皮尔伯格泵技术有限责任公司 | 电气的机动车流体泵 |
DE102019212122A1 (de) * | 2019-08-13 | 2021-02-18 | Robert Bosch Gmbh | Vorrichtung zur Erfassung einer Drehbewegung und/oder einer Winkelposition |
US11519757B2 (en) | 2020-06-11 | 2022-12-06 | Honeywell International Inc. | System and method for determining angular position in rotating machines |
CN113258727B (zh) * | 2021-06-01 | 2022-05-03 | 广东威灵电机制造有限公司 | 电机及家用电器 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3931257A1 (de) * | 1988-09-22 | 1990-04-05 | Mitsubishi Electric Corp | Buerstenloser motor mit hall-effekt-elementen |
EP3300233A1 (de) * | 2016-09-22 | 2018-03-28 | Valeo Systèmes d'Essuyage | Gleichstrom-elektromotor ohne wischblätter für scheibenreinigungssystem eines kraftfahrzeugs |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0644383U (ja) * | 1992-11-10 | 1994-06-10 | 松下電器産業株式会社 | ブラシレスモータ |
JPH06303752A (ja) * | 1993-04-12 | 1994-10-28 | Seiko Epson Corp | ブラシレスモータの位置検出用磁気回路 |
JPH06327195A (ja) * | 1993-05-12 | 1994-11-25 | Matsushita Electric Ind Co Ltd | 速度検出装置 |
JP2000156963A (ja) | 1998-11-19 | 2000-06-06 | Moriyama Kogyo Kk | ブラシレスdcモータの磁極位置検出装置、および薄板状磁石付き環状シート |
DE10207004A1 (de) * | 2002-02-19 | 2003-08-28 | Bosch Gmbh Robert | Antriebsvorrichtung |
JP2004120817A (ja) * | 2002-09-24 | 2004-04-15 | Kayaba Ind Co Ltd | ロータ及びその製造方法 |
DE10357018A1 (de) * | 2003-12-05 | 2005-08-25 | Valeo Systèmes d`Essuyage | Elektromotorischer Antrieb |
EP1907798B1 (de) * | 2005-07-26 | 2009-12-02 | ebm-papst St. Georgen GmbH & Co. KG | Elektromotor mit einem absolutwert-drehwinkelsensor, und verfahren zur erzeugung eines drehwinkel-absolutwerts |
JP5263024B2 (ja) | 2009-06-18 | 2013-08-14 | 株式会社日立製作所 | 回転角検出装置および回転速度検出装置 |
US9273947B2 (en) | 2012-02-07 | 2016-03-01 | Lg Innotek Co., Ltd. | Sensing magnet apparatus for motor |
-
2017
- 2017-03-16 DE DE102017204415.2A patent/DE102017204415A1/de not_active Withdrawn
-
2018
- 2018-03-01 WO PCT/EP2018/055044 patent/WO2018166806A1/de unknown
- 2018-03-01 CN CN201880018174.7A patent/CN110383652A/zh active Pending
- 2018-03-01 EP EP18708661.6A patent/EP3596812A1/de not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3931257A1 (de) * | 1988-09-22 | 1990-04-05 | Mitsubishi Electric Corp | Buerstenloser motor mit hall-effekt-elementen |
EP3300233A1 (de) * | 2016-09-22 | 2018-03-28 | Valeo Systèmes d'Essuyage | Gleichstrom-elektromotor ohne wischblätter für scheibenreinigungssystem eines kraftfahrzeugs |
Non-Patent Citations (1)
Title |
---|
See also references of WO2018166806A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2018166806A1 (de) | 2018-09-20 |
DE102017204415A1 (de) | 2018-09-20 |
CN110383652A (zh) | 2019-10-25 |
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