EP3837518A1 - Dispositif de détection de couple, procédé de détermination d'un couple, stator et ensemble statorique - Google Patents

Dispositif de détection de couple, procédé de détermination d'un couple, stator et ensemble statorique

Info

Publication number
EP3837518A1
EP3837518A1 EP19742745.3A EP19742745A EP3837518A1 EP 3837518 A1 EP3837518 A1 EP 3837518A1 EP 19742745 A EP19742745 A EP 19742745A EP 3837518 A1 EP3837518 A1 EP 3837518A1
Authority
EP
European Patent Office
Prior art keywords
stator
tabs
sensor device
magnetic
arrangement
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.)
Pending
Application number
EP19742745.3A
Other languages
German (de)
English (en)
Inventor
Ekkehart Fröhlich
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.)
Valeo Schalter und Sensoren GmbH
Original Assignee
Valeo Schalter und Sensoren 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 Valeo Schalter und Sensoren GmbH filed Critical Valeo Schalter und Sensoren GmbH
Publication of EP3837518A1 publication Critical patent/EP3837518A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/104—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving permanent magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/105—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving inductive means

Definitions

  • Torque sensor device method for determining a torque
  • the invention relates to a torque sensor device for detecting a torque applied to a shaft, in particular for detecting a torque applied to a steering shaft of a motor vehicle, the torque sensor device having a magnet arrangement, a stator arrangement and a magnet sensor arrangement.
  • the invention further relates to a method for determining a torque applied to a shaft by means of a torque sensor device.
  • the invention relates to a stator and a stator arrangement for a torque sensor device.
  • Generic torque sensor devices in particular for steering shafts of motor vehicles, are known in principle from the prior art, for example from DE 10 2013 006 379 A1 or EP 1 269 133 B1.
  • Torque sensor devices of this type are used, for example, in electric steering systems in order to control the electric drive motor of the steering system based on a steering torque applied by a driver, for example in order to provide appropriate steering assistance.
  • Torque sensor devices are generally used for this purpose in connection with an axially split shaft and with a torsion bar with a defined, known torsional rigidity, the torsion bar connecting a first part of the axially split shaft to a second part of the axially split shaft.
  • a magnet arrangement with at least one magnetic element is connected to the first part of the steering shaft in a rotating test
  • a stator arrangement with one or more magnetically conductive stators is rotationally connected to the second part of the shaft, the stator arrangement being arranged concentrically around the magnet arrangement, in particular the magnet element, as a rule in the radial direction with a small air gap in between.
  • the stator arrangement which usually comprises two separate stators, each with an annular disk-shaped region, the magnetic flux of a magnetic field generated by the magnet arrangement can be converted into a magnetic sensor arrangement with at least one
  • Magnetic sensor such as a Hall sensor, are routed and evaluated.
  • the magnet arrangement connected to the first part of the shaft in particular its magnetic element, is moved by a rotational movement of the shaft relative to the stator arrangement connected to the second part of the shaft, the magnetic flux density in the stator arrangement changes, in particular in the individual ones
  • Stators which can be detected by means of the magnetic sensor arrangement.
  • the change in the magnetic flux density in the stator arrangement depends, inter alia, on the size of the relative movement of the magnet arrangement, in particular the respective magnetic elements, with respect to the stator arrangement, in particular with respect to the individual stators, i.e. from the angle of rotation.
  • the twist angle can thus be inferred from the change in the detected flux density, and the twist angle in turn can be used to determine the torque applied to the shaft with knowledge of the torsional rigidity of the torsion bar.
  • a further magnetic field for example a magnetic field of a further sensor device or one in the vicinity of the
  • Torque sensor device existing, for example from nearby electrical machines, such as electric motors or generators, or High-current lines, generated magnetic interference field, there may be an, in particular undesirable, influence on the flux transmitted to the magnetic sensor device, in particular a change in the transmitted flux density generated by the magnetic interference field, which leads to an incorrect, but plausible and therefore not recognized as faulty sensor signal leads to an incorrect torque value as a result.
  • US 2016/0091574 A1 proposes to provide at least one additional magnetic element that is arranged symmetrically to the magnetic element of the further sensor device in order to compensate for the influence of the magnetic field of the magnetic element of the further sensor device on the actual sensor device.
  • this requires knowledge of the direction of the interfering magnetic field.
  • An object of the invention is to provide an alternative, in particular an improved,
  • Torque sensor device with a reduced influence of at least one external magnetic interference field present in the vicinity of the torque sensor device on a torque value to be determined. Another object is to provide an alternative, in particular improved, method for determining a torque applied to a shaft as well as an alternative, in particular improved stator and an alternative, in particular improved stator arrangement, for an alternative, in particular improved torque sensor device.
  • a torque sensor device for detecting a torque applied to a shaft, in particular for detecting one on a shaft
  • the torque applied to the steering shaft of a motor vehicle has a magnetic arrangement, a stator arrangement and a magnetic sensor arrangement, wherein the magnet arrangement is designed to generate at least one magnetic field, wherein a magnetic flux can be generated in the stator arrangement, and wherein the
  • Magnet arrangement and the stator arrangement are movable relative to each other in the circumferential direction.
  • the magnet arrangement and the stator arrangement are designed and arranged relative to one another such that a relative magnetic movement between the magnet arrangement and the stator arrangement in the circumferential direction about a center axis of the torque sensor device in the stator arrangement can produce a first magnetic flux with a first magnetic flux direction and, in particular simultaneously, a second magnetic flux with a second flow direction opposite to the first flow direction.
  • the stator arrangement is designed to handle the first magnetic flux generated in the stator arrangement and the second generated in the stator arrangement
  • the magnetic sensor arrangement of a torque sensor device comprises a first magnetic sensor and to detect the second magnetic flux a second magnetic sensor.
  • Torque sensor device the magnet arrangement and the stator arrangement are designed and arranged relative to one another such that the generated first
  • magnetic flux and the second magnetic flux have the same amount or strength, i.e. are the same size, and only in opposite
  • Torque in particular for detecting a on a steering shaft
  • a torque sensor device is preferably designed to detect a torque applied to a shaft, the shaft having a first part and a second part rotatable relative to the first part, and in particular the first part and the second part of the shaft being connected to one another by means of a torsion bar are.
  • An invention is preferred
  • Torque sensor device is designed to detect the rotation of the first part of the shaft relative to the second part of the shaft.
  • Torsional stiffness of the torsion bar of the shaft can be used to determine the applied torque from the detected rotation of the shaft.
  • the magnet arrangement preferably has and is at least one magnetic element for generating at least one magnetic field, in particular the at least one
  • Magnet element of the magnet arrangement in particular can be arranged concentrically to the shaft, i.e. such that the center axis of the torque sensor device with the
  • Axis of rotation of the shaft is aligned, wherein the magnet arrangement, in particular the at least one magnet element of the magnet arrangement, can in particular be connected to a first part of the shaft in a rotational test.
  • the at least one magnet element of the magnet arrangement is preferably a permanent magnet, in particular a completely closed ring magnet or a ring magnet-like magnet that is almost closed in the circumferential direction, the magnet element in particular having a plurality of ring magnet segments of opposite polarity or corresponding pole pairs, each with in the circumferential direction
  • opposite polarity are arranged adjacent to each other, in particular two adjacent sections of opposite polarity form a pair of poles.
  • the number of pole pairs in the circumferential direction particularly preferably corresponds to the number of tabs of the first and / or the second stator.
  • magnet arrangement has one or more further magnetic elements, these are particularly preferably likewise configured as described above and in particular are arranged concentrically with the at least one magnetic element.
  • a “ring magnet-like magnet” is understood here to mean a magnet, in particular a permanent magnet which, although not completely closed in the circumferential direction, is designed in such a way that it is almost
  • the stator arrangement can preferably also be arranged concentrically to the shaft and in particular can be connected to a second part of the shaft in a rotational test.
  • the stator arrangement is in particular arranged at least partially concentrically to the magnet arrangement, in particular to the at least one magnet element, the stator arrangement in particular being arranged at least partially around the outside of the magnet arrangement, preferably around the at least one magnet element and in particular with a defined air gap therebetween.
  • the stator arrangement serves, in particular, and is preferably designed to conduct a magnetic flux of the magnetic field generated by the magnet arrangement to the magnetic sensor arrangement.
  • the torque sensor device has in particular at least one flux conductor, preferably at least two flux conductors arranged in parallel and at a distance from one another. This enables better resolution and thus better accuracy of the torque sensor device to be achieved.
  • At least one of the flux conductors is preferably arranged on the stator arrangement and is either attached directly to the stator arrangement or indirectly via a holder.
  • the flux conductor or flux conductors can also be arranged on a housing of the torque sensor device.
  • At least one magnetic sensor is in particular a simple Hall sensor with which a magnetic flux density of a magnetic field running perpendicular to the sensor surface of the Hall sensor or a portion of the magnetic flux density running perpendicular to the sensor surface of the magnetic field can be detected, with particular preference at least the first magnetic sensor, in particular all the magnetic sensors of the first
  • Receiving device are arranged fixed to the housing, i.e. stationary or stationary with respect to the rotatable shaft.
  • the torque sensor device in particular also has a control device which is designed to, depending on the magnetic fluxes detected by means of the magnetic sensor arrangement, switch one to the other
  • Torque sensor device functionally connected shaft to determine a torque applied to the shaft.
  • the inventive design of the torque sensor device and the magnetic fluxes generated in this way in opposite directions make it possible to easily differentiate the sensor signals generated by the magnetic sensor arrangement, in particular by forming a difference between a first sensor signal generated by the first magnetic sensor and a second one generated by the second magnetic sensor Sensor signal, a magnetic interference flow, that is in the direction of the first magnetic flux or the second magnetic flux, ie in the direction of a sensor useful signal that characterizes a torque value, works out, in particular in the middle.
  • the stator arrangement has in particular a first stator, a second stator and a third stator, which are each arranged concentrically to one another along the center axis, the third stator in the axial direction, based on the center axis of the stator arrangement, is arranged between the first stator and the second stator, with a relative movement between the magnet arrangement and the stator arrangement in the circumferential direction producing the first magnetic flux with the first magnetic flux direction between the first stator and the third stator in the stator arrangement and, in particular simultaneously, the second magnetic flux can be generated in the stator arrangement with the second flow direction opposite the first flow direction between the second stator and the third stator.
  • an inventive stator has in particular a first stator, a second stator and a third stator, which are each arranged concentrically to one another along the center axis, the third stator in the axial direction, based on the center axis of the stator arrangement, is arranged between the first stator and the second stator, with a relative movement
  • the magnet arrangement and the stator arrangement are in particular designed and arranged relative to one another such that the first magnetic flux and the second magnetic flux are each generated in such a way that the first direction of flow and the second direction of magnetic flux run counter to one another and in each case parallel to the center axis of the stator arrangement.
  • Torque sensor device in particular one designed to compensate for an external interference field acting in the direction of flow of a useful signal
  • the first and / or the second stator has in particular one
  • annular disc-shaped stator body and extending from this in an axial direction tabs, the tabs are arranged distributed in particular in the circumferential direction, in particular evenly distributed with spacing gaps between them.
  • the stator body of the first and / or the second stator in particular each has a radially inner edge and a radially outer edge, the tabs extending in particular from the radially inner edge of the annular disk-shaped stator body, in particular all to the same side, ie in the same direction.
  • the first stator and the second stator in particular each comprise an annular disk-shaped stator body and tabs which differ from the associated one
  • Each stator body extends in an axial direction, the first stator and the second stator being designed and arranged such that the tabs of the first stator and the second stator each extend in the axial direction from the associated stator body in the direction of the third stator.
  • the “axial” directional reference relates to a direction parallel to the axis of rotation of the shaft or to a direction parallel to the center axis of the torque sensor device, the directional indication "Circumferential direction” corresponding to a direction of rotation around this axis of rotation or center, the direction “radial” to a direction that is perpendicular to the axial and circumferential direction.
  • the indication of direction “tangential” refers accordingly to a direction which is perpendicular to the axial direction and the radial direction.
  • the third stator comprises in particular a stator ring and first plates and second plates, the first plates and second plates each extending in opposite axial directions away from the stator ring of the third stator.
  • the first tabs extend in particular in a first axial direction away from the stator ring and the second tabs in a second axial direction opposite to the first axial direction away from the stator ring.
  • first tabs and the second tabs of the third stator are in particular each arranged distributed in the circumferential direction, in particular evenly and with spacing gaps between them.
  • the third stator has in particular a double number of tabs compared to the first stator and the second stator, but in particular in each case an equal number of first and second tabs. That the number of the first tabs of the third stator preferably corresponds to the number of tabs of the first stator and / or the number of tabs of the second stator, the number of tabs of the first stator and the number of tabs of the second stator being in particular the same.
  • first tabs and the second tabs of the third stator are in particular arranged at least partially offset from one another in the circumferential direction, in particular in each case completely offset from one another.
  • the first tabs and the second tabs of the third stator are arranged in the circumferential direction in particular at least partially overlapping, preferably completely overlapping, in particular in alignment in the axial direction.
  • first tabs and the second tabs of the third stator are arranged alternately in the circumferential direction at least over part of the circumference of the stator, preferably over the entire circumference of the stator, in particular without overlap.
  • first tabs and second tabs can also be arranged to overlap in the circumferential direction, in particular in alignment in the axial direction.
  • stator is particularly simple and inexpensive to manufacture, in particular as a simple stamped and bent part, the tabs being punched out together with the stator body and then being able to be bent accordingly in the respective associated axial direction, for example first tabs. "up” and second tabs "down”.
  • the latter in particular in alignment, has the advantage that a
  • Magnet arrangement with constant polarity in the axial direction can be used, in particular a single, sleeve-shaped magnetic element with constant polarity in the axial direction, which extends over the axial length of the stator and has an alternating polarity in the circumferential direction, is sufficient to the in a torque sensor device according to the invention to generate the first magnetic flux and the second magnetic flux in opposite directions.
  • a magnetic element is particularly simple and therefore inexpensive to manufacture.
  • the first tabs of the third stator are arranged offset in particular in the circumferential direction from the tabs of the first stator and in particular intermeshingly engage in spacing gaps between the tabs of the first stator and / or the second tabs of the third stator are in The circumferential direction is offset from the tabs of the second stator and in particular intermeshingly engages in spacing gaps between the tabs of the second stator.
  • the first tabs of the third stator mesh with tabs of the first stator and the second tabs of the third stator preferably mesh with tabs of the second stator. In this way, a particularly compact arrangement of the stator arrangement in the axial direction can be achieved, as well as good forwarding of the magnetic flux.
  • the stator ring of the third stator is in particular formed by an annular disk-shaped stator body which is arranged concentrically to the center axis and extends in the radial direction, and the first tabs and the second tabs extend away from this stator body, in particular in
  • a torque sensor device can be formed in a particularly simple manner, in particular a torque sensor device that is particularly compact in the axial direction and requires only a few components.
  • the first tabs and the second tabs are in particular formed in one piece with the stator body. This enables a particularly compact and in some cases also weight-saving stator arrangement and requires a maximum of a few steps to assemble a torque sensor device according to the invention.
  • a torque sensor device can be formed in a particularly simple manner with such a stator.
  • the stator body of the third stator has in particular a radially inner edge and a radially outer edge, the first plates and the second plates in particular each extending away from the radially inner edge of the annular disk-shaped stator body, in particular in opposite axial directions.
  • a torque sensor device according to the invention can be formed in a particularly simple manner with such a stator.
  • the stator ring of the third stator comprises in particular a first annular disk-shaped stator body which is arranged concentrically to the center axis and extends in the radial direction and a second one which is arranged concentrically to the center axis and which is radial Direction-extending, annular disc-shaped stator body, wherein the first tabs of the third stator are connected to the first stator body, in particular are formed integrally / integrally therewith, and extend away from the first stator body, and wherein the second tabs of the third stator are connected to the second stator body are, in particular are integrally formed / integrally therewith, and extend away from the second stator body.
  • the first stator body and the second stator body are arranged at a distance from one another, in particular in the axial direction.
  • the third stator can also be formed by two stators, in particular two stators, which are each designed as a first stator or second stator and are arranged with their tabs facing away from each other. In this way, a torque sensor device can be provided in a simple manner, in particular on the basis of existing components or assemblies, which enables compensation of an external magnetic interference field.
  • Torque sensor device in particular two torque sensor assemblies arranged one above the other in the axial direction and known from the prior art, for example two identical ones, for example according to the torque sensor assemblies formed in DE 10 2013 006 379 A1 or EP 1 269 133 B1, each with at least one magnetic element, two Stator elements and at least one associated magnetic sensor, wherein the third stator each through the two neighboring ones middle stators is formed, wherein the two torque sensor assemblies are in particular designed and arranged such that a relative movement between the stator elements and the magnet of the respective assembly generates a magnetic flux that is transmitted to the associated magnetic sensor, and wherein the two assemblies each such and are arranged relative to one another such that, according to the invention, a first magnetic flux with a first direction of flow and, in particular simultaneously, a second magnetic flux with a second,
  • a torque sensor device can be provided in a simple manner, in particular on the basis of existing components or assemblies, which enables compensation of an external magnetic interference field.
  • the magnet arrangement has, in particular, a magnet element which extends in the axial direction, in particular over an entire axial length of the third stator, in particular along the first and the second tabs in the axial direction.
  • a torque sensor device can be provided which only requires one magnetic element.
  • a polarity of the magnet arrangement, in particular of the at least one magnet element is constant in the axial direction.
  • the magnetic element can be manufactured particularly easily and is therefore inexpensive.
  • the first tabs and the second tabs of the third stator are in each case aligned in the axial direction over the circumference, in particular in order to bring about the generation of the first magnetic flux and the second magnetic flux with opposite flux directions.
  • Torque sensor device in particular, a polarity of the magnet arrangement, in particular of the at least one magnetic element, is constant in the axial direction and the torque sensor device also has a third stator, the first tabs and second tabs of which are arranged so as to be completely overlapping in the circumferential direction, in particular in the axial direction, with the first tabs and the second tabs of the third stator overlap at least partially sections of different polarity, in particular in the circumferential direction.
  • the magnet arrangement has in particular a first section extending in the axial direction and a second section extending in the axial direction, with at least one position in FIG
  • Circumferential direction of the magnet arrangement in particular at any position in
  • the first section extends in particular in the axial direction along the first tabs of the third stator.
  • the second section extends in particular in the axial direction along the second tabs of the third stator.
  • this enables the production of the third stator as a stamped and bent part, which in this case has first and second tabs which are offset in the circumferential direction in order to produce the first magnetic flux and the second magnetic flux with opposite flux directions.
  • the magnet arrangement has in particular a first section extending in the axial direction and a second section extending in the axial direction, the polarity of the first axial section being at least at one position in the circumferential direction of the magnet arrangement, in particular at each position in the circumferential direction at this position is opposite to the polarity of the second axial section at this position, the torque sensor device further comprising a third stator, the first tabs and second tabs in FIG.
  • the circumferential direction are each arranged at least partially offset from one another, in particular in each case completely offset from one another, the first tabs and the second tabs of the third stator overlap portions of different polarity, in particular in the circumferential direction.
  • the first axial section and the second axial section adjoin one another in the axial direction and are in particular part of a common magnetic element, in particular part of an entire axial magnet axial length of the third stator extending magnetic element. This enables a particularly compact configuration in the axial direction to be achieved.
  • the magnet arrangement comprises a single magnetic element with two axial sections, each of which has poles arranged alternately in the circumferential direction, the two axial sections being arranged offset by one pole in the circumferential direction, so that always opposite in the axial direction Poles are adjacent, in particular adjacent to each other. This enables a particularly compact configuration in the axial direction to be achieved.
  • both magnetic sensors in particular a wired magnetic sensor with connecting pins, the magnetic sensor being arranged in the axial direction between the third stator and one of the other two stators and in particular being arranged in this way, that the connection pins point outwards in the radial direction.
  • connection pins are in particular at least one wired
  • Magnetic sensor soldered to a circuit board in particular to a circuit board which is arranged with its circuit board level parallel to the center axis of the stator arrangement or the torque sensor device.
  • Connection pins can also be connected to a lead frame, in particular inserted directly into it, in particular with a lead frame which is arranged with its lead frame plane parallel to the center axis of the stator arrangement. In this way, a compact arrangement and connection to a printed circuit board can be achieved with wired magnetic sensors.
  • At least one magnetic sensor of the magnetic sensor arrangement is an SMD magnetic sensor, the magnetic sensor being arranged in particular in the axial direction at the level of the third stator and in particular being arranged on a printed circuit board which is connected to it PCB level normal is arranged oriented to the center axis of the stator arrangement or the torque sensor device.
  • SMD magnetic sensor the magnetic sensor being arranged in particular in the axial direction at the level of the third stator and in particular being arranged on a printed circuit board which is connected to it PCB level normal is arranged oriented to the center axis of the stator arrangement or the torque sensor device.
  • SMD Surface-Mount Device
  • the torque sensor device has in particular a first one
  • At least one flux conductor is a stamped part or a
  • Stamped and bent part preferably all flow conductors. This enables a particularly simple, inexpensive and, in terms of geometry, flexible production of the flow conductors.
  • a torque sensor device in particular if the two magnetic sensors of the magnetic sensor arrangement are wired magnetic sensors, in particular the two flux conductors of the first flux conductor pair and / or the second flux conductor pair are each geometrically identical or identical parts, in particular all flux conductors being geometrically identical, are in particular identical parts.
  • a torque sensor device in particular at least one flux conductor of the first flux conductor pair and a flux conductor of the second pair of flux conductors of the same design or identical parts, in particular if the two magnetic sensors of the magnetic sensor arrangement are SMD magnetic sensors, in particular a first flux conductor of the first
  • Fluxleitertown with a first flux conductor of the second flux conductor pair is geometrically identical or as the same part and a second flux conductor of the first
  • the flux conductors of the first are in particular
  • the flux conductor pair is arranged in the axial direction between the third stator and the first stator and the flux conductor of the second flux conductor pair between the third stator and the second stator, the first magnetic sensor being arranged in particular between the two flux conductors of the first flux conductor pair and the second magnetic sensor in particular between the two flux conductors of the second pair of river conductors.
  • Magnetic sensor arrangement SMD magnetic sensors the flux conductors in particular each have a collecting surface and a tab that extends normal to the center axis and projects radially outward from the collecting surface, wherein
  • the collecting surface of the flux conductors extends in particular in each case normal to the center axis, ie in the radial direction and in the circumferential direction, with the collecting surface preferably being in the case of the first flux conductors and the tab in the axial direction is arranged in different planes, while in the second flow conductors the tab in particular lies in one plane with the associated collecting surface, the second flow conductors in particular L-shaped (tab arranged at the end of the collecting surface) or T-shaped (Tab arranged in the middle of the collecting surface) are formed.
  • the tab and the collecting surface are preferably connected by means of a connecting section extending in the axial direction in order to compensate for the offset between the different levels. In this way, a functionally advantageous but nevertheless simple configuration and arrangement of the flow conductors can be achieved.
  • the first flux conductor, in particular its collecting surface, of the first flux conductor pair is arranged in particular in the axial direction between the first stator and the third stator, and the associated second flux conductor, in particular its collecting surface, is arranged between the third stator and the second stator arranged.
  • the first flux conductor of the second pair of flux conductors, in particular its collecting surface is arranged in particular between the second stator and the third stator, and the associated second flux conductor in particular between the third stator and the first stator.
  • the two outer flux conductors or just one of them can be arranged in the axial direction outside the first or second stator.
  • one or more flux conductors can also have one or more others
  • the collecting surface of at least one flux conductor in particular all flux conductors, can be arranged as an alternative to the above-described configurations, each parallel to the center axis of the
  • Extend stator assembly i.e. in the circumferential direction and in the axial direction, in which case at least one collecting surface is formed by a ring segment or ring jacket segment which extends only partially over the circumference or by a ring segment or ring jacket segment which extends almost over the entire circumference or by a ring or ring jacket which is closed in the circumferential direction can.
  • a collecting surface of the first flux conductor of the first flux conductor pair projects in particular in the axial direction over the edge of the stator body of the first stator.
  • a collecting surface of the second flux conductor of the second flux conductor pair projects in particular in the axial direction over the edge of the stator body of the second stator.
  • the collecting surfaces of the second flux conductors of the first flux conductor pair and of the second flux conductor pair each protrude in particular in the axial direction over the edge of the stator ring of the third stator.
  • the second flow guides can also be combined to form a common flow guide and, in particular, be formed in one piece or integrally.
  • the flux densities in particular their
  • Changes caused by a relative movement between the magnet arrangement and the stator arrangement can be easily, at least partially, in some cases completely, a compensation of a disturbance which is caused by an external magnetic interference field present in the vicinity of the torque sensor device, when detecting a torque applied to a steering shaft of a motor vehicle, in particular calculate it out or center it away.
  • the calculated difference is divided by the factor two before determining the torque applied to the shaft as a function of the difference calculated from the first sensor signal and the second sensor signal.
  • Torque sensor device an external, magnetic interference field can usually be assumed with sufficient approximation, this overlap equally on both useful fields.
  • a stator according to the invention for a torque sensor device for detecting a torque applied to a shaft, in particular for detecting a torque applied to a steering shaft of a motor vehicle, in particular for a torque sensor device according to the invention, comprises a radial one
  • stator body Direction extending stator body and first tabs and second tabs, wherein the first tabs and second tabs each in opposite axial directions extend away from this stator body.
  • the first tabs and the second tabs are in particular formed in one piece with the stator body.
  • the stator body is designed in particular in the form of an annular disk and has a radially inner edge and a radially outer edge, the first tabs and the second tabs in particular each extending away from the radially inner edge of the annular disk-shaped stator body, in particular in
  • first tabs and the second tabs are each arranged at least partially offset from one another in the circumferential direction, in particular in each case completely offset from one another, or the first tabs and the second tabs are arranged at least partially overlapping in the circumferential direction, preferably completely overlapping , in particular in alignment in the axial direction.
  • Detection of a torque applied to a steering shaft of a motor vehicle in particular for a torque sensor device according to the invention, has a first stator, a second stator and a third stator, which are each arranged concentrically to one another along a center axis, the third stator being in the axial direction with respect to the center axis is arranged between the first stator and the second stator, the third stator being designed according to the invention.
  • a torque sensor device according to the invention can be formed in a particularly simple manner.
  • Fig. 1 shows a first embodiment of an inventive
  • Torque sensor device with a first embodiment of a stator arrangement according to the invention with a first embodiment of a stator according to the invention in perspective view
  • FIG. 2c shows the magnetic element of the torque sensor device from FIG. 2a in
  • FIGS. 1 and 2a shows the stator according to the invention from FIGS. 1 and 2a in a partial representation in
  • Fig. 3a shows a second embodiment of an inventive
  • Torque sensor device with a second embodiment of a stator arrangement according to the invention with a second embodiment of a stator according to the invention in perspective view
  • FIG. 3b shows the torque sensor device from FIG. 3a in a side view, but without the flux conductors
  • FIG. 3c shows the torque sensor device from FIG. 3a without the magnetic element
  • FIG. 3d shows the stator according to the invention from FIG. 3a in individual parts
  • Fig. 4 shows a third embodiment of an inventive
  • Torque sensor device with soldered to a circuit board
  • Fig. 5 shows a fourth embodiment of an inventive
  • Fig. 6 shows a fifth embodiment of an inventive
  • Fig. 7 shows a sixth embodiment of an inventive
  • Fig. 1 shows a first embodiment of a torque sensor device 10 according to the invention with a first embodiment of a stator arrangement 1 1 according to the invention with a first embodiment of a stator 1 1 C according to the invention in perspective view
  • the torque sensor device 10 for detecting a steering shaft of a motor vehicle, not shown here applied torque is formed and arranged concentrically with its center axis Z to the axis of rotation of the steering shaft and can be connected to the steering shaft in a manner known from the prior art, the steering shaft having a first part and a second part, each by means of a Torsion bar are connected in the axial direction and can be rotated relative to each other by applying a torque.
  • Torque sensor device 10 the twist can be detected and the torque applied to the shaft can be determined on the basis thereof.
  • the respective components preferably each have a circular contour.
  • Magnetic field is formed, can be connected to the first part of the steering shaft rotation test, while the stator arrangement 1 1 is designed for rotationally fixed connection to the second part of the steering shaft and via a not shown here
  • Stator holder can be connected to the second part of the steering shaft rotation test.
  • Torque sensor device 10 has a magnet arrangement with in this example a single magnet element 12, a stator arrangement 11 and a magnetic sensor arrangement 13.
  • the magnet arrangement in particular the magnet element 12, and the stator arrangement 11 are in the circumferential direction, i.e. about the center axis Z, movable relative to one another and designed according to the invention and arranged relative to one another such that by a corresponding relative movement, in particular as a result of a
  • a first magnetic flux F1 with a first magnetic flux direction is generated and a second magnetic flux F2 with a second flux direction opposite to the first flux direction (see FIG. 2a), the first flux using the first magnetic sensor 13A the
  • Magnetic sensor arrangement 13 can be detected and the second magnetic flux by means of the second magnetic sensor 13B.
  • the magnetic element 12 is arranged within the stator arrangement 11, in particular concentrically to this or the center axis Z of the stator arrangement
  • Torque sensor device 10 and with an air gap between them, the magnetic element 12 extending in the axial direction along the center axis Z almost over the entire length of the stator arrangement 1 1, which is only on the edges, 1, protrudes slightly upwards and slightly downwards over the magnetic element 12.
  • the magnetic element 12 can also be longer in the axial direction than the stator arrangement 11, that is to say above and / or below over the edges 11 A / 11 B
  • stator element 11 and magnetic element 12 have no effect on the symmetry of the components.
  • the stator arrangement 11 has a total of three stators, a first stator 11 A, a second stator 11 B and a third stator 11 C, which are likewise arranged concentrically to one another.
  • the third stator 1 1 C is arranged in the axial direction, based on the center axis Z, between the first stator 1 1 A and the second stator 1 1 B.
  • All three stators 1 1 A, 1 1 B, and 1 1 C each have an annular disk-shaped stator body R1, R2 or R3, and tabs L1, L2, L3-1 and L3-2 extending in the axial direction therefrom ,
  • the first stator 1 1 A has, just like the second stator 1 1 B with the tabs L2, tabs L1 which only extend in one direction, while the third stator 1 1 C according to the invention has first tabs L3-1, which are extend in a first axial direction away from the stator body R3, and second tabs L3-2, which extend away from the stator body R3 in an opposite axial direction.
  • the tabs L1 and L2 of the first stator 1 1 A and the second stator 1 1 B each extend in the direction of the third stator 1 1 C, the first tabs L3-1 of which extend in the direction of the first stator 1 1 A and whose second tabs L3-2 extend in the direction of the second stator 11B.
  • the individual tabs L1, L2, L3-1, L3-2 of the 3 stators 1 1 A, 1 1 B and 1 1 C are each distributed uniformly in the circumferential direction with corresponding ones
  • the first stator 1 1 A and the second stator 1 1 B each having 8 tabs which are evenly distributed in the circumferential direction, while the third stator 1 1 C has a total of 16 tabs L3-1 and L3-2,
  • first tabs L3-1 and 8 second tabs L3-2 see also FIGS. 2a, 2b and 2d.
  • the first tabs L3-1 and the second tabs L3-2 of the third stator 11 C are in this exemplary embodiment of a stator 11 C according to the invention
  • the circumferential direction is completely offset from one another and alternately.
  • the individual stators 1 1 A, 1 1 B and 1 1 C are arranged with respect to one another in such a way that the tabs L1 of the first stator 1 1 A and the first tabs L3-1 of the third stator 1 1 C mesh with one another, likewise the tabs L2 of the second stator 1 1 B and the second tabs L3-2 of the third stator 1 1 C.
  • the first magnetic sensor 13A is provided for detecting the first magnetic flux F1, which is generated between the first stator 1 1 C and the third stator 1 1 C, and for detecting the second magnetic flux F2, which is between the second stator 1 1 B and the third stator 1 1 C is generated, the second magnetic sensor 13B is provided, wherein in this embodiment, the two magnetic sensors 13A and 13B are respectively wired magnetic sensors 13A and 13B, which are used for electrical
  • Printed circuit board also have connection pins not shown in FIG. 1 (cf. FIG. 4: printed circuit board LP and connection pins 31).
  • flux conductors 14A, 14B, 15A and 15B are provided, each of which flux conductor pairs 14 and
  • first magnetic flux F1 is bundled and amplified by means of the first flux conductor pair 14 and directed to the first magnetic sensor 13A and by means of the second flux conductor pair 15 the second magnetic flux F2, which is detected by the second magnetic sensor 13B.
  • all four flux conductors 14A, 14B, 15A, 15B are identical, that is to say formed as identical parts, and each formed by rectangular, flat, plate-like segments which are arranged radially inside the ring-shaped stator bodies R1, R2 and R3, each with an axial one Distance between them and in each case between the two associated stators 1 1 A and 1 1 C or 1 1 B and 1 1 C.
  • one or more of the flux conductors 14A, 14B, 15A and 15B could also be used as arcuate segments, in particular with the stator bodies R1, R2 or R2 parallel edges.
  • the first magnetic sensor 13A and the second magnetic sensor 13B are sandwiched in the axial direction between the two associated flux conductors 14A and 14B or 15A and 15B of the respectively associated flux conductor pair 14 or 15 arranged.
  • FIG. 2a shows the torque sensor device 10 from FIG. 1 in a more detailed, also perspective view compared to FIG. 1, but without the
  • Magnetic sensors 13A and 13B by means of which in particular the design of the stator arrangement 11 with the interlocking tabs L1, L2, L3-1 and L3-2 and the magnetic element 12 can be recognized, especially in connection with FIGS. 2b to 2d.
  • FIG. 2b shows the torque sensor device 10 from FIG. 1 without the magnetic element 12
  • FIG. 2c shows the magnetic element 12 of the torque sensor device from FIG. 2a in individual parts
  • FIG. 2d shows the stator 11C from FIGS. 1 and 2a in individual parts in perspective View.
  • the magnetic element 12 in this exemplary embodiment is a closed ring magnet designed as a permanent magnet with two axial sections 12A and 12B, each with alternating polarity P1 and P2 in the circumferential direction, the two axial sections 12A and 12B are circumferentially offset from one another by a pole P1 and P2, respectively.
  • stator arrangement 11 In connection with the stator arrangement 11, in particular in connection with a third stator 11 C designed according to FIG. 2d with first lugs L3-1 and second lugs L3-2 arranged offset in the circumferential direction, causes a relative movement in the circumferential direction between the in the manner described above, the magnetic element 12 and the stator arrangement 1 1 that the first magnetic flux F1 and the second magnetic flux F2 each with
  • the respective orientation of the vectors of the magnetic fluxes F1 and F2 depends on the direction of the relative movement in the circumferential direction between the magnetic element 12 and the stator arrangement 11. The vectors of the magnetic fluxes F1 and F2 thus point away from one another in a first direction of relative movement and away from one another in a second direction.
  • 3a to 3b is a second embodiment of a torque sensor device 20 according to the invention with a second
  • Sensor device 20 shows a perspective view.
  • 3b shows the torque sensor device 20 in a side view, but without the flux conductors 14, 15 or 14A, 14B, 15A, 15B.
  • 3c shows the torque sensor device 20 in a side view, but in this case without the magnetic element 22 and
  • FIG. 3d shows the stator according to the invention from FIG. 3a in individual parts in a perspective view.
  • the magnetic element 22 has a constant polarity in the axial direction and the first tabs L3-1 and the second tabs L3-2 of the third stator 21 C are arranged in alignment in the circumferential direction.
  • the opposite first and second directions of flow also make it possible, as in the exemplary embodiment described above, to average out and thus calculate out a disturbance caused by an external magnetic interference field by simple difference formation.
  • Fig. 4 shows a third embodiment of a torque sensor device 30 according to the invention with magnetic sensors 13A, 13B soldered to a circuit board LP in a perspective view, it being clearly visible in this illustration that the connection pins 31 of the two magnetic sensors 13A and 13B are each guided radially outward and are soldered to a circuit board LP arranged parallel to the center axis Z with its circuit board level.
  • FIG. 5 shows a fourth exemplary embodiment of a torque sensor device 40 according to the invention in a perspective view, but without magnetic sensors, this torque sensor device 40 basically being the
  • Torque sensor device 10 from FIGS. 1 and 2a to 2d corresponds, but is designed for use with magnetic sensors designed as SMD components, which requires flux conductors 44A, 44B, 45A and 45B that are configured differently and arranged differently.
  • the other components are identical to the torque sensor device 10.
  • two flux conductors 44A and 44B and 45A and 45B each form a flux conductor pair 44 and 45.
  • the two flux conductors 44A and 44B of the first flux conductor pair 44 are not both between the first stator 1 1A and the third stator 11 C, but the second flux conductor 44B is arranged on the side of the third stator 1 1 C facing away from the first stator 1 1 A on its stator body and is fastened to it.
  • first flux conductors 44A and 45A are designed as identical parts and the second flux conductors 44B and 45B, all flux conductors 44A, 44B, 45A and 45B each extending in the radial direction and in the circumferential direction
  • the torque sensor device 40 is designed to use magnetic sensors designed as SMD components, which enable and / or require a different arrangement, the flux conductors 44A, 44B, 45A and 45B or the flux conductor pairs 44 and 45 are each designed accordingly.
  • both magnetic sensors can be arranged on a common printed circuit board in a common plane, in particular on a printed circuit board that can be arranged with its printed circuit board plane normal to the center axis Z, the collecting surface 46 and the tab 47 of the second flux conductors 44B and 45B are each in one arranged common plane, while the first flux conductors 44A and 45A each have a connecting section 48 extending in the axial direction 48 between the collecting surface 46 and the tab 47, each of the connecting section 48 in FIG
  • the tabs 47 of the second flow conductors 44B and 45B are each arranged at one end of the collecting surfaces 46, so that there is an L-shaped geometry for the second flow conductors 44B and 45B.
  • the tabs 47 could also be arranged in the middle of the collecting surface 46, so that a T-shaped geometry results, with which in some cases a better concentration or concentration of the magnetic flux can be achieved, since this in particular means the use of larger collecting surfaces 46 allows.
  • the collecting surfaces 46 can also project in the axial direction on the stator edge, either only in one direction or in both, as in the exemplary embodiments in FIGS. 6 and 7.
  • FIG. 6 shows a fifth exemplary embodiment of a torque sensor device 50 according to the invention in a perspective view, this exemplary embodiment of a torque sensor device 50 according to the invention differing from the previously described exemplary embodiment only in the geometric configuration and arrangement of the flux conductors 54A, 54B, 55A, and 55B.
  • flux conductors 54A and 54B and 55A and 55B each form a pair of flux conductors 54 and 55.
  • all flux conductors 54A and 54B and 55A and 55B have an axially and circumferentially extending one
  • Collection surface 46 which is formed in each case by a jacket segment extending only over part of the circumference, and which in each case protrudes in the axial direction on both sides beyond the edge of the respective adjacent stator body.
  • the configuration with tabs 57 and in each case one connecting section 58 extending in the axial direction is similar to that described above
  • the jacket segment-like configuration of the flow conductors 54A and 54B and 55A and 55B, in particular the two inner second flow conductors 54B and 55B, enables these two flow conductors 54B and 55B to be combined into one component, i.e. a one-piece or integral configuration, so that nominally only three flux conductors are required, which reduces the assembly effort of the torque sensor device 50 in comparison to the torque sensor devices 10, 20, 30 and 40 described above, each with four flux conductors to be fastened.
  • FIG. 7 shows a sixth exemplary embodiment of a torque sensor device 60 according to the invention in a perspective view, this exemplary embodiment being based on the torque sensor device 20 from FIGS. 3a to 3d, however, in contrast to this, it is designed for the arrangement of SMD magnetic sensors and flow conductors designed accordingly 64A and 64B, and 65A and 65B, which differs from the torque sensor device 50 explained with reference to FIG. 6
  • a small gap in the circumferential direction may alternatively be provided and the collecting areas in particular only be formed over a circumferential angle of 358 ° or at most 355 ° or even at most only 350 °, or, as described above, only over a significantly smaller angular range of, for example, 30 ° to 60 °.
  • flow conductors 64A and 64B and 65A and 65B are essentially similar to the flow conductors 54A and 54B and 55A and 55B from FIG. 6 and also have corresponding tabs 67 and the first flow conductors 64A and 65A also have corresponding connection sections 68.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

L'invention concerne un dispositif de détection de couple (10) destiné à détecter un couple appliqué sur un arbre, un procédé de détermination d'un couple, appliqué sur un arbre, à l'aide d'un dispositif de détection de couple (10), un stator et un ensemble statorique (11) destiné à un dispositif de détection de couple (10). Le dispositif de détection de couple (10) comprend un ensemble magnétique, un ensemble statorique (11) et un ensemble de détection magnétique (13). L'ensemble magnétique et l'ensemble statorique (11) sont conçus et disposé l'un par rapport à l'autre de telle sorte qu'un mouvement magnétique relatif entre l'ensemble magnétique et l'ensemble statorique dans la direction périphérique peut produire un premier flux magnétique (F1) présentant une première direction de flux magnétique et une second flux magnétique (F2) présentant une deuxième direction de flux opposée à la première direction de flux. L'ensemble de détection magnétique (13) comprend un premier capteur magnétique (13A) destiné à détecter le premier flux magnétique (F1) et un deuxième capteur magnétique (13B) destiné à détecter le deuxième flux magnétique (F2).
EP19742745.3A 2018-08-15 2019-07-22 Dispositif de détection de couple, procédé de détermination d'un couple, stator et ensemble statorique Pending EP3837518A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018119807.8A DE102018119807A1 (de) 2018-08-15 2018-08-15 Drehmomentsensorvorrichtung, Verfahren zum Bestimmen eines Drehmoments, Stator und Statoranordnung
PCT/EP2019/069619 WO2020035262A1 (fr) 2018-08-15 2019-07-22 Dispositif de détection de couple, procédé de détermination d'un couple, stator et ensemble statorique

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EP3837518A1 true EP3837518A1 (fr) 2021-06-23

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US (1) US11860053B2 (fr)
EP (1) EP3837518A1 (fr)
KR (1) KR102454974B1 (fr)
CN (1) CN112805546B (fr)
DE (1) DE102018119807A1 (fr)
WO (1) WO2020035262A1 (fr)

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DE102019120654A1 (de) * 2019-07-31 2021-02-04 HELLA GmbH & Co. KGaA Vorrichtung zur Bestimmung eines Lenkmoments in einem Kraftfahrzeug
EP4242616A3 (fr) 2020-08-26 2023-12-13 Valeo Schalter und Sensoren GmbH Dispositif de capteur de couple, ensemble de conducteur de flux et conducteur de flux
KR20230001179A (ko) * 2021-06-28 2023-01-04 엘지이노텍 주식회사 센싱 장치
DE102021125949A1 (de) 2021-10-06 2023-04-06 Infineon Technologies Ag Sensorvorrichtungen und zugehörige Herstellungs- und Betriebsverfahren
WO2023059052A1 (fr) * 2021-10-07 2023-04-13 엘지이노텍 주식회사 Dispositif de détection
KR20230171683A (ko) * 2022-06-14 2023-12-21 엘지이노텍 주식회사 센서 장치
CN116929615B (zh) * 2023-09-18 2023-12-01 深圳市鑫精诚传感技术有限公司 一种电磁式复合多轴扭矩传感器及扭矩测量方法

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DE102018119807A1 (de) 2020-02-20
WO2020035262A1 (fr) 2020-02-20
CN112805546A (zh) 2021-05-14
KR20210034092A (ko) 2021-03-29
US11860053B2 (en) 2024-01-02
CN112805546B (zh) 2022-10-04
KR102454974B1 (ko) 2022-10-17
US20210302246A1 (en) 2021-09-30

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