WO2024042020A1 - Carte de circuit imprimé pour un capteur inductif de mesure de position angulaire, d'encombrement reduit - Google Patents
Carte de circuit imprimé pour un capteur inductif de mesure de position angulaire, d'encombrement reduit Download PDFInfo
- Publication number
- WO2024042020A1 WO2024042020A1 PCT/EP2023/072899 EP2023072899W WO2024042020A1 WO 2024042020 A1 WO2024042020 A1 WO 2024042020A1 EP 2023072899 W EP2023072899 W EP 2023072899W WO 2024042020 A1 WO2024042020 A1 WO 2024042020A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit board
- printed circuit
- primary winding
- poles
- windings
- 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.)
- Ceased
Links
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
- G01D5/20—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 by varying inductance, e.g. by a movable armature
- G01D5/204—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 by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
- G01D5/2053—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 by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable non-ferromagnetic conductive element
-
- 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
- G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
- G01D2205/20—Detecting rotary movement
- G01D2205/24—Detecting rotary movement using magnetic means not otherwise provided for in this subclass
Definitions
- the field of the invention is that of detecting the position of a moving mechanical structure, in particular a rotor of a rotating machine, using a target mounted integral with said structure.
- the invention relates more particularly to an inductive sensor, configured to measure the position of a rotating part, in particular, but not only, an axis of rotation or a rotor of a rotating electrical machine.
- angular inductive sensors have a structure similar to that of linear inductive sensors: they comprise a fixed part, called a “transformer”, and comprising a fixed primary winding and at least two fixed secondary windings, and a mobile part consisting of a metal target which is rigidly connected to the mechanical part to be angularly controlled.
- the fixed primary winding and the fixed secondary windings are generally made on a printed circuit board, and each made up of electrically conductive tracks traced on the printed circuit board.
- the operating principle of such a sensor is based on the variation in coupling between the primary winding and the secondary windings, together forming a transformer operating at high frequency and without using a magnetic circuit.
- currents induced in the target modify voltages induced in the secondary windings by the primary winding.
- the coupling between the primary and secondary windings varies depending on the position of the target.
- a high frequency alternating current circulates in the primary winding, producing a magnetic field at the same frequency.
- Each secondary winding is surrounded by the primary winding, and forms at least two loops.
- the successive loops each surround a substantially identical surface.
- the successive loops intersect and therefore have an opposite orientation from a trigonometric point of view.
- Each secondary winding consists of one or more pairs of these loops, each pair of loops comprising two successive loops having opposite orientations.
- pole pair a pair of loops, one of the loops forming a positive pole and the other of the loops forming a negative pole.
- the primary flux creates magnetic fluxes seen as inverted from one loop to the other of each secondary circuit.
- the primary and secondary windings are configured to be used with a metal target as mentioned above, which is rigidly connected to the mechanical part to be angularly controlled.
- the movement of the target modifies the coupling between the primary coil and each loop of each secondary coil.
- a measurement of the voltage induced across the secondary windings therefore makes it possible to know the position of the mechanical part.
- the inductive sensor is an angular position measurement sensor
- An example of such a sensor is described for example in patent application US 2014/0167788 A1.
- Figures 1 A and 1 B illustrate the windings of an inductive sensor for measuring angular position according to the prior art.
- the windings here include a primary winding and two secondary windings.
- Figure 1 A shows the primary winding and a first secondary winding
- Figure 1 B shows a second secondary winding.
- the primary winding 11 is in the shape of a circle, with an opening for the arrival and exit of an electric current. It can be formed from several concentric circles, superimposed on different layers and/or faces of a printed circuit board. It surrounds the secondary windings 12a and 12b.
- Each of the secondary windings 12a and 12b surrounds a disc-shaped surface open in the center, and has an opening for the arrival and exit of an electric current.
- the secondary windings 12a and 12b are arranged concentrically with the primary winding 11.
- Each of the secondary windings 12a and 12b is formed of at least one pair of poles 120, here two pairs of poles.
- each pair of poles 120 is formed of two loops of the same dimensions, 121 and 122, oriented in opposite directions.
- the loops can each be made up of several turns, not shown, angularly offset from each other to allow their production on the same printed circuit board.
- the primary and secondary windings are generally integrated on the same printed circuit board, with an electronic component having a power supply function for the primary winding and/or a function for measuring voltage values across the secondary windings.
- This electronic component is generally placed next to the windings, on the printed circuit board.
- the distance between this electronic component and the windings must be sufficiently high, to avoid electromagnetic coupling between the windings and the electronic component, in use.
- manufacturing constraints impose a minimum spacing, in order to avoid damaging the electrical tracks forming the windings, during the integration of the electronic component.
- An objective of the present invention is to propose a solution to overcome the aforementioned drawbacks.
- an aim of the invention is to propose a printed circuit board for an inductive sensor for measuring the angular position of a target, offering both optimal coupling with said target, and optimal flexibility in terms of bulk.
- a printed circuit board for an inductive sensor intended to measure the angular position of a target comprising:
- each secondary winding has a number N o of pairs of poles, with 1 ⁇ N 0 ⁇ (Ntot-l);
- the primary winding delimits a surface of interest inscribed inside a so-called useful disk, with a ratio between the area of the surface of interest and the area of the useful disk which is between 70% and 99 %
- this ratio is greater than 80%, or even 90%, or even 95%. This ratio may also be less than 99%, or even 98%, or even 96%.
- the windings extend in a shape close to a disk, with a diameter of the disk sufficiently high to guarantee optimal coupling with the target, without it being necessary to reduce a distance between the target and the windings.
- the disk defining the shape of the windings is called “useful disk”.
- the primary winding surrounds the secondary windings, and delimits a surface of interest registered inside this useful disk, with an area ratio % and between 70% and 90% between the area of said surface of interest and the area of the useful disk.
- the invention thus offers optimal coupling between the windings and the target, while making it possible to respect mechanical integration constraints such as the presence of an electronic component in a determined location on the printed circuit board.
- the invention also offers great robustness, and low sensitivity to misalignment between the coils and the target, thanks to the shape of the coils close to a disk shape.
- the secondary windings would each have only a single pair of poles, with the primary winding which exactly follows the contour of the secondary windings.
- the primary winding comprises at least one portion in the shape of an arc of a circle, which can follow an external contour of the secondary windings, and at least one line connecting two ends of the at least one portion in the shape of an arc of a circle. Furthermore, according to the invention, the surface of interest delimited by the primary winding passes through the center of the useful disk. Thus, the primary winding follows an external contour of the secondary windings, but passes at a distance from an internal contour of the secondary coils.
- the diameter of the useful disk is advantageously less than or equal to 30 mm.
- the primary winding comprises at least one portion in the shape of an arc of a circle, which follows the perimeter of the secondary windings.
- the primary winding may further comprise at least one rectilinear portion, connecting together two ends of said portion in the shape of an arc of a circle.
- the secondary windings extend together in an arc of a circle of between 200° and 340°.
- the number N o of pairs of poles is advantageously greater than or equal to 2.
- the at least two pairs of poles can be arranged directly one after the other.
- the primary winding can then consist of: an arcuate portion; and a rectilinear portion, connecting together the ends of the arcuate portion.
- the number N o of pairs of poles is a multiple of 2, and the pairs of poles are distributed in two groups spaced from one another.
- the two groups are advantageously arranged in rotational symmetry, with a rotation angle of 180°.
- the primary winding can then be constituted by: two arcuate portions; and two rectilinear portions, connecting two by two the ends of the portions in an arc of a circle.
- the printed circuit board according to the invention may further comprise electronics having a function of supplying electricity to the primary winding and/or a function of measuring voltage values at the terminals of the secondary windings, said electronics being arranged to outside the primary winding, and at least partly inside the useful disk.
- FIG. 1 B illustrate the windings of an inductive sensor for measuring angular position, according to the prior art
- FIG. 2B illustrate the windings of a printed circuit board for an inductive sensor for measuring angular position, according to a first embodiment of the invention
- FIG. 3 schematically illustrates the surface of interest according to the invention and the useful disk according to the invention
- FIG. 4 schematically illustrates the windings of a printed circuit board according to the invention, in use with a corresponding target;
- FIG. 5B illustrate the windings of a printed circuit board for an inductive sensor for measuring angular position, according to a variant of the first embodiment of the invention
- FIG. 6 illustrates the primary winding and one of the secondary windings of a printed circuit board for an inductive sensor for measuring angular position, according to a second embodiment of the invention
- FIG. 7 illustrates a printed circuit board according to the invention, further comprising an electronic component occupying part of a disk defining the shape of the windings.
- Figures 1 A to 6 are shown in Figures 1 A to 6, the latter being constituted by metal tracks formed on a printed circuit board.
- the metal tracks can extend along two opposite faces of the printed circuit board, with vias locally passing through the printed circuit board in the thickness direction.
- the metal tracks may further extend into intermediate layers of a multilayer printed circuit board.
- Figure 2A illustrates the primary winding 21 and a first secondary winding 22a.
- Figure 2B illustrates a second secondary winding 22b.
- Figures 2A and 2B will only be described for their differences relative to the windings of Figures 1 A and 1 B.
- Each secondary winding 22a, 22b is made up of at least one pair of poles 23, each pair of poles 23 extending along an arc of a circle a' equal to 3607N t ot, with N to t a higher integer or equal to 2.
- N to t 4.
- the pairs of poles 23 are represented schematically, and each include a loop oriented in a first direction, symbolized by the sign “+”, and a loop oriented in the opposite direction, symbolized with the “-” sign.
- the detail of the turns forming each of the loops has not been shown, said turns being able to be distributed over one or more layers, this aspect being an element known from the prior art and not constituting the heart of the invention.
- Each secondary winding 22a, 22b comprises a number N o of pairs of poles 23, with 1 ⁇ No ⁇ (N to t-1).
- N 0 3.
- the two secondary windings 22a and 22b are surrounded by the primary winding 21.
- the primary winding 21 has a portion 211, in the shape of an arc of a circle, and a line 212 located at the location of at least one pair of missing poles and which connects the two ends 213 and 214 of the circular arc portion 211.
- the primary winding 21 can consist of several concentric turns distributed over one or more layers. Here again, for reasons of readability, we have not represented each of these turns separately.
- line 212 is a straight line.
- the two ends 213 and 214 are connected by a curved line, or any other non-rectilinear line forming an open line.
- line 212 is configured to bypass a predetermined obstacle.
- the arcuate portion 211 extends here at an angle between 270° and 330°, following the exterior contour of the secondary windings 22a and 22b.
- the primary winding delimits a surface of interest S1 (see Figure 3, hatched area), inscribed inside a so-called useful disk D1.
- the surface of interest S1 has the shape of a truncated disk, of the same diameter as the useful disk D1.
- a ratio between the area of the surface of interest S1 and the area of the useful disk D1 is between 70% and 99%, here of the order of 98%.
- the surface of interest S1 passes through the center of the useful disk D1. We thus ensure that the shape of the surface of interest S1 does not stray too far from the shape of the useful disk D1.
- Figure 4 illustrates schematically, and in a perspective view, the windings of a printed circuit board according to the invention, in use with a corresponding target 40.
- the target 40 is a metal target, arranged integral with a mechanical element movable in rotation, and whose angular position we wish to measure.
- the target 40 comprises a plurality of blades arranged in a generally circular shape.
- the number of blades is equal to N to t as defined above.
- Each blade extends over an angular sector of the same extent, and the angular distribution of the blades is regular.
- the target 40 is arranged concentric with the useful disk as defined above.
- the target 40 is identical with the target intended to cooperate with a printed circuit board according to the prior art, comprising a number N to t of pairs of poles.
- the windings of the printed circuit board comprise: a primary winding 41, here formed by four turns: two concentric turns located on a first face of the printed circuit board, superimposed to two other concentric turns located on an opposite face of the printed circuit board; and three secondary windings 42a, 42b, 42c, each composed of several turns which each extend on the first face and on the opposite face of the printed circuit board, each secondary winding comprising two pairs of poles, with each pair of poles which extends over an angle of 120°
- Figures 5A and 5B illustrate the windings of a printed circuit board for an inductive sensor for measuring angular position, according to a variant of the first embodiment of the invention.
- Figure 5A illustrates the primary winding 51 and a first secondary winding 52a.
- Figure 5B illustrates a second secondary winding 52b.
- the second secondary winding 52b comprises, at its ends, two half-loops 521 of the same orientation.
- a surface occupied by the first secondary winding 52a overlaps exactly with a surface occupied by the second secondary winding 52b, despite the angular offset between their respective pairs of poles.
- a pair of poles 53 At the level of the second secondary winding, we can define a pair of poles 53, as a whole loop and two half-loops located on either side of the whole loop.
- the pairs of poles are arranged one directly after the other.
- Figure 6 illustrates the primary winding 61 and one of the secondary windings 62a of a printed circuit board for an inductive sensor for measuring angular position, according to a second embodiment of the invention.
- the number N o of pairs of poles in each of the secondary windings is a multiple of two.
- the pairs of poles are distributed into two groups 630c, 630d.
- Each group 630c, 630d has the same number of pairs of poles.
- each group 630c, 630d comprises a single pair of poles.
- the two groups 630c, 630d are arranged spaced apart from each other.
- they are symmetrical to each other, according to a rotational symmetry of an angle of 180°.
- This symmetry offers, by construction, at least partial compensation for possible mechanical offsets during integration (in particular between the windings and the target).
- the primary winding 61 surrounds the several secondary windings.
- the primary winding 61 has: a first portion 611 c, in the shape of an arc of a circle, which follows the contour of the first of said blocks of turns; a second portion 611 d, in the shape of an arc of a circle, which follows the contour of the other of said blocks of turns; a first line 612c, connecting two ends respectively of the first portion 611 c in the shape of an arc of a circle and of the second portion 611 d in the shape of an arc of a circle; and a second line 612d, connecting two other ends respectively of the first portion 611 c in the shape of an arc of a circle and of the second portion 611 d in the shape of an arc of a circle.
- first and second lines 612c, 612d are each rectilinear. In variants not shown, these may be curved lines, or any other non-rectilinear drawing forming an open line.
- the first and second lines are not necessarily similar, one may be straight and the other not.
- the secondary windings 62a extend together along a cumulative arc of a circle of between 200° and 340°.
- Figure 7 finally illustrates a printed circuit board 700 according to the invention.
- the printed circuit board 700 comprises: a substrate 701, for receiving the primary and secondary windings, which comprises at least one electrically insulating layer whose two opposite faces are covered with metal tracks; and primary 71 and secondary 72a windings such as those described below above (a single secondary winding 72a is shown in Figure 7, for reasons of readability of the figure).
- the printed circuit board 700 further comprises an electronic component 770 having a function of supplying electricity to the primary winding 71 and a function of measuring voltage values across the windings secondary 72a.
- the electronic component 770 includes for example at least one microcontroller.
- the electronic component 770 extends close to the primary winding 71, outside the surface of interest delimited by the latter, and partly inside the useful disk D1 as defined with reference to the figure 3.
- the primary winding 71 remains at a sufficient distance from the electronic component 770, without it being necessary to move the electronic component 770 (which would increase the overall size of the printed circuit board), and without it being necessary either to reduce the diameter of a disk defining the shape of the windings. As explained in the introduction, this large diameter makes it possible to maintain a high coupling between these coils and the target.
- the invention is not limited to the examples and variants described above.
- the different examples and variants can be combined with each other.
- the secondary windings can be two, three, or even more in number.
- the secondary windings can each include several pairs of poles, or even a single pair of poles.
- the diameter of the useful disk D1 ( Figure 3), defining the shape of the windings, is less than or equal to 50 mm, or even less than or equal to 30 mm.
- the inductive coupling is high between the primary winding and the secondary windings, as well as between the windings and the target. We can therefore move the primary winding locally relative to the secondary windings, without adverse consequences on the performance of the sensor. The target can also be moved further away from the windings, to facilitate mechanical production.
- the invention can be applied in the field of automobiles, in particular for measuring the angular position of an electric motor rotor.
- the printed circuit board according to the invention is advantageously configured to be placed at one end of a rotation shaft.
- the printed circuit board according to the invention can be configured to be crossed by the rotation shaft. In any case, it differs from printed circuit boards intended to be placed on the periphery of the rotation shaft, at a distance from the axis of rotation of the shaft.
- the invention is particularly advantageous for adapting an inductive sensor to a pre-existing printed circuit board, on which the space available for the windings is imposed.
- the invention makes it possible in particular to offer optimal coupling between the windings and the target as mentioned above, while respecting strong constraints in terms of space available for the integration of the windings.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380060142.4A CN119895233A (zh) | 2022-08-26 | 2023-08-21 | 用于测量角位置的电感式传感器的体积减小的印刷电路板 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FRFR2208543 | 2022-08-26 | ||
| FR2208543A FR3139194B1 (fr) | 2022-08-26 | 2022-08-26 | Carte de circuit imprimé pour un capteur inductif de mesure de position angulaire, d’encombrement réduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024042020A1 true WO2024042020A1 (fr) | 2024-02-29 |
Family
ID=84053233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2023/072899 Ceased WO2024042020A1 (fr) | 2022-08-26 | 2023-08-21 | Carte de circuit imprimé pour un capteur inductif de mesure de position angulaire, d'encombrement reduit |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN119895233A (fr) |
| FR (1) | FR3139194B1 (fr) |
| WO (1) | WO2024042020A1 (fr) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140167788A1 (en) | 2012-12-18 | 2014-06-19 | Continental Automotive Gmbh | Inductive sensor for angular measurement of the position of a moving part and measuring method using such a sensor |
| US20180259362A1 (en) * | 2015-11-12 | 2018-09-13 | HELLA GmbH & Co. KGaA | Apparatus for detecting a rotational movement |
| US20190128702A1 (en) * | 2017-11-01 | 2019-05-02 | Integrated Device Technology, Inc. | Sensor coil optimization |
| WO2021180535A1 (fr) * | 2020-03-13 | 2021-09-16 | Robert Bosch Gmbh | Dispositif inductif de détection de position de rotor, dispositif d'entraînement |
-
2022
- 2022-08-26 FR FR2208543A patent/FR3139194B1/fr active Active
-
2023
- 2023-08-21 WO PCT/EP2023/072899 patent/WO2024042020A1/fr not_active Ceased
- 2023-08-21 CN CN202380060142.4A patent/CN119895233A/zh active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140167788A1 (en) | 2012-12-18 | 2014-06-19 | Continental Automotive Gmbh | Inductive sensor for angular measurement of the position of a moving part and measuring method using such a sensor |
| US20180259362A1 (en) * | 2015-11-12 | 2018-09-13 | HELLA GmbH & Co. KGaA | Apparatus for detecting a rotational movement |
| US20190128702A1 (en) * | 2017-11-01 | 2019-05-02 | Integrated Device Technology, Inc. | Sensor coil optimization |
| WO2021180535A1 (fr) * | 2020-03-13 | 2021-09-16 | Robert Bosch Gmbh | Dispositif inductif de détection de position de rotor, dispositif d'entraînement |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3139194B1 (fr) | 2024-10-18 |
| CN119895233A (zh) | 2025-04-25 |
| FR3139194A1 (fr) | 2024-03-01 |
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