Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
  • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
  • B22F10/20—Direct sintering or melting
  • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
  • B22F10/60—Treatment of workpieces or articles after build-up
  • B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
  • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
  • B23K26/34—Laser welding for purposes other than joining
  • B23K26/342—Build-up welding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y10/00—Processes of additive manufacturing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y70/00—Materials specially adapted for additive manufacturing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y80/00—Products made by additive manufacturing
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
  • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
  • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
  • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
  • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
  • H01F1/047—Alloys characterised by their composition
  • H01F1/053—Alloys characterised by their composition containing rare earth metals
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
  • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
  • H01F1/047—Alloys characterised by their composition
  • H01F1/053—Alloys characterised by their composition containing rare earth metals
  • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
  • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
  • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
  • H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
  • H01F1/086—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together sintered
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
  • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
  • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
  • B22F2998/10—Processes characterised by the sequence of their steps
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C2202/00—Physical properties
  • C22C2202/02—Magnetic
• • 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
  • G01D2205/80—Manufacturing details of magnetic targets for magnetic encoders
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P10/00—Technologies related to metal processing
  • Y02P10/25—Process efficiency

Definitions

• the invention relates to a method of manufacturing a rotating part, in particular so as to obtain a rotating part whose rotational speed can be measured by a suitable measuring system.
• the method and system are particularly suited to the industrial field of aircraft, more generally vehicles, and to rotating parts subject to significant constraints, in particular rotating gearbox parts which are in an environment that can be subjected to fog. oil, at a wide temperature range (especially between -54 ° C and 200 ° C), and vibration.
• Rotational speed measurement systems exist in many forms.
• a first known form is a rotational speed measurement system phonic wheel composed of toothing and equipping the rotating part.
• a proximity sensor arranged opposite the phonic wheel, makes it possible to detect the passage of each of the teeth of the toothing of the phonic wheel, thus making it possible to determine the speed of rotation of the rotating part with a fine resolution.
• this type of measurement system requires the use of a specific toothing (if the piece does not already have one that can be exploitable) adding mass to the piece. This type of measuring system is for example described in the French applications FR2633722, FR2891361 and FR2896882.
• Another form is a rotational encoder rotation speed measuring system, where a sensor (inductive, capacitive, optical or magnetic) allows the reading of a band or hole disk forming an encoding system.
• a processing unit then converts the encoding into a signal representative of the rotation.
• the measurement method is expensive to implement, at a low frequency amplitude and when an optical sensor is used, is not compatible with an environment of oil mist type.
• a last form has been studied but still poses several problems: the addition of a magnet type insert to a rotating part conjugated to a sensor for detecting the passage of the room in front of the sensor.
• the addition of a part causes several problems, such as the formation of an unbalance on the rotating part and the need to have a solid attachment between the rotating part and the insert so as to withstand the centrifugal force due to the rotation of the rotating part.
• the aim of the invention is to overcome at least some of the disadvantages of rotary speed measurement systems of known rotating parts.
• the invention aims to provide, in at least one embodiment of the invention, a method of manufacturing a rotating part, the rotating part thus manufactured being particularly adapted so that its speed of rotation is measured by a measuring system.
• the invention also aims to provide, in at least one embodiment, a method of manufacturing a rotating part to obtain a rotating part whose rotational speed can be measured without significant addition of mass or insert generating potential fixation problems.
• the invention also aims to provide, in at least one embodiment of the invention, a method of manufacturing a rotating part to obtain a rotating part whose rotational speed can be measured without generating an imbalance on the rotating part.
• the invention also aims to provide, in at least one embodiment of the invention, a method of manufacturing a rotating part to obtain a rotating part whose rotational speed can be measured at high temperatures and / or or in a vibratory environment.
• the invention also aims to provide, in at least one embodiment of the invention, a method of manufacturing a rotating part making it possible to obtain a rotating part whose rotational speed can be measured in the presence of oil mist or other atmosphere that does not allow a satisfactory optical reading.
• the invention also aims to provide, in at least one embodiment, a rotating part whose rotation speed can be easily measured at low cost.
• the invention also aims to provide, in at least one embodiment, a rotating speed measurement system of a rotating part at low cost, accurate and adding little mass.
• the invention relates to a method for manufacturing a rotating part along an axis, comprising:
• the method comprises a step of incorporating a magnetic material to the powder during the production of the formed part, in a predefined area of the formed part, called magnetized zone, the magnetic material having the following characteristics:
• T c Curie temperature
• a method according to the invention thus makes it possible to obtain a rotating part having a magnetized zone in which there is a magnetic material, without the addition of an insert since the magnetized zone is directly formed by incorporating magnetic material during the production. from the piece itself from the powder.
• the magnetized zone thus introduces no significant unbalance in the rotating part, and the hardness in the zone is significantly homogeneous in and around of the magnetized zone.
• the hardness is preferably expressed in Vickers hardness, or according to others types of hardness depending on the measurement mode.
• the magnetized zone forms a local magnetization of the rotating part. It also has no risk of coming off due to the centrifugal force when the part is rotating.
• x the density of the magnetic material
• D the hardness of the formed part
• X the density of the formed part
• d D ⁇ ((kD) / 100)
• k 25 or 20 or 15 or 10 or 5
• x X ⁇ ((nX) / 100)
• n 20 or 15 or 10 or 5
• the magnetic remanence commonly identified by the term Br in the literature greater than or equal to 0.1 T results in a high magnetic power that makes it possible to ensure detection of the magnetic field disturbance caused by the magnetized zone during the first time.
• the Curie temperature (commonly identified by the term T c in the literature) greater than or equal to 250 ° C makes it possible to ensure that the magnetized zone maintains a sufficient magnetization in the temperature range to which the piece is subjected. rotation, for example typically [-54 ° C; 200 ° C] in a gear box.
• the rise in temperature does not involve demagnetization.
• the temperature coefficient of the remanence should be low (less than or equal to 1% / ° C) so as to limit the variations of the magnetic remanence in case of temperature variations.
• the magnetized zone is a predetermined zone, for example by calculation, so that the presence of the magnetic material impacts at least the mechanical stresses in operation of the rotating part.
• the material for making the formed part is for example a metal or a metal alloy, for example a steel alloy (for example 16NCD13, 32CDV13, or 40CDV12).
• the formed part is the result of the transformation of the powder, and the formed part is then transformed again if necessary to obtain the rotating part.
• the step of obtaining the rotating part comprises a step of machining the formed part and / or an assembly step with another part so as to form the rotating part.
• a rotating part is also called a rotating part, and designates a part whose main operation requires its rotation, in particular to transmit a torque or a movement.
• the rotating part is for example a shaft (including a transmission shaft), a pinion, etc.
• the magnetic material is a samarium-cobalt alloy, Neodymium, or AINiCo.
• the samarium-cobalt alloy, Neodymium, or AINiCo frequently used in the manufacture of magnets and having the characteristics set out above.
• the magnetic material is incorporated in the form of particles or a pellet.
• the particle or pellet shape allows for easier incorporation of the magnetic material to the powder during manufacture of the formed part.
• the particles are mixed with the powder forming the material and making it heterogeneous, while the pellet is a small piece of variable size and shape forming a homogeneous whole, integrated into the part formed during its manufacture.
• the magnetized zone is an area of the part corresponding to an eccentric zone of the axis of the rotating part.
• the magnetized zone rotates about the axis due to the rotation of the rotating part. It is thus possible to detect the passage of the magnetized zone in front of a sensor receptive to magnetic changes, as explained below.
• the step of producing the rotating part from the powder and the integration of the magnetic material are carried out by additive manufacturing, preferably by sintering or laser melting.
• additive manufacturing in particular sintering or laser melting, is particularly suitable for producing objects from a powder, and allows the easy incorporation of the magnetic material during the production of the formed part.
• the invention also relates to a rotating part obtained by a method according to the invention, characterized in that it comprises an integrated magnetized zone.
• a rotating part according to the invention therefore has no unbalance and is suitable for use in an environment such as that of a gearbox. In addition, it is possible to easily measure its rotational speed.
• the magnetic zone is eccentric from the axis of the rotating part.
• the magnetic zone describes a circular movement during the rotation of the rotating part, and the time between two passes of the magnetic zone in front of a sensor is representative of the speed of rotation of the rotating part.
• the invention also relates to a system for measuring the speed of rotation of a rotating part according to the invention, characterized in that it comprises a plurality of sensors arranged near the region of the rotating part comprising the magnetic material and configured to each detect a passage of the magnetic zone in front of each sensor in different angular sectors during rotation of the rotating part.
• a measuring system makes it possible to measure the speed of a rotating part obtained by the method according to the invention, thanks to the presence of at least one sensor arranged in such a way that it detects the passages of the magnetized zone in its vicinity, by variation of the magnetic field.
• the sensor is for example an active sensor (Hall effect type or magnetoresistance), or a passive sensor (current type of eddy).
• the sensor is for example a fixed sensor, or a mobile sensor whose position is known at any time with respect to the position of the magnetized sector of the rotating part.
• the measurement of the speed of rotation is thus obtained without contact, and can be carried out in an environment comprising an oil mist, a range of high operating temperature (especially [-54 ° C, 200 ° C] in a gearbox), and a vibratory environment.
• At least one sensor is disposed in a hollow core of the rotating part.
• the size of the measurement system is reduced because at least one sensor (preferably all the sensors) is disposed inside the rotating part.
• the sensor may be disposed at the axis of rotation of the rotating part.
• a measurement system according to the invention comprises a plurality of sensors configured so as to each detect a passage of a plurality of magnetic zones in different angular sectors.
• the plurality of sensors and the plurality of magnetic zones make it possible to increase the resolution of the measurement system.
• a measurement system comprises at least one mobile sensor whose position is known at any time with respect to the zone of the rotating part comprising the magnetic material, disposed near the magnetic zone, the system being configured so as to detect a passage of the magnetic zone in front of each sensor during the rotation of the rotating part.
• the mobile sensor may itself be rotated, in particular in the opposite direction of the rotating part, and thus further detect the magnetized zone, to increase the resolution of the measurement system without adding sensor or magnetized area.
• the invention also relates to a method, a rotating part and a measuring system characterized in combination by all or some of the characteristics mentioned above or below.
• FIG. 1 is a schematic view of a method for manufacturing a rotating part according to one embodiment of the invention
• FIG. 2 is a schematic partial perspective view of a rotating part according to an embodiment of the invention, obtained by the manufacturing method,
• Figure 3 is a schematic sectional view in perspective of a rotating part and a system for measuring the rotational speed of the rotating part, according to one embodiment of the invention.
• Figure 1 shows schematically a method 10 for manufacturing a rotating part according to an embodiment of the invention.
• the circles represent products and the rectangles represent steps allowing the passage from one product to another.
• a first step shown is a step 12 of producing a formed part 16 from a material in powder form 14.
• This production step is preferably done by additive manufacturing, for example by sintering or laser melting.
• a second step shown is a step 18 for obtaining a rotating part 20 from the part 16 formed.
• This step comprises for example a machining step of the formed part 16, but may also include other processing steps known in the manufacture of industrial parts.
• the peculiarity of the process according to the invention is that it comprises a step 21 of incorporating a magnetic material 22, for example in the form of particles or a pellet, into the powder during the step of producing the part 16 formed, in a predefined area (for example by calculation) of the formed part 16, said magnetized zone.
• a magnetic material 22 for example in the form of particles or a pellet
• the invention allows the incorporation directly during the production of the part.
• FIG. 2 schematically and partially in perspective shows a rotating part according to one embodiment of the invention, obtained by the manufacturing method as described above.
• the rotating part here a pinion
• the rotating part thus comprises a magnetized zone 24, here visible on an outer face of the pinion.
• the rotating part 20 here comprises a magnetized zone 24 disposed inside a hollow core 26 of the rotating part 20.
• a sensor 28 of the measuring system is disposed at the axis of rotation of the rotating part.
• the sensor 28 is arranged so as to detect a passage of the magnetized zone 24 in front of it. , thus making it easy to determine the rotational speed of the rotating part as a function of the time elapsed between each passage of the magnetized zone 24.
• the arrangement of the sensor in the hollow core 26 of the rotating part makes it possible to reduce the size of the measuring system.
• the sensor is a sensor that can detect a variation of the surrounding magnetic field, in particular that caused by the magnetized zone.
• the sensor is for example an active sensor type Hall or magnetoresistance, or a passive sensor type current eddy. More generally, the sensor makes it possible, for example, to supply an output signal having a value of 0 when the magnetic field measured is below a reference value and a value 1 when the magnetic field measured is above a value of reference.
• the measuring system also comprises conventional elements for recovering the output signal, determining the speed of rotation of the rotating part from the output signal (calculation unit for example), to provide the value of the rotational speed. to other equipment, power the sensor if necessary, etc.
• the senor may be disposed outside the rotating part and not in a hollow core thereof.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Plasma & Fusion (AREA)
• Optics & Photonics (AREA)
• General Physics & Mathematics (AREA)
• Composite Materials (AREA)
• Crystallography & Structural Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2017
  • 2017-11-10 FR FR1760603A patent/FR3073435B1/fr active Active
• 2018
  • 2018-11-05 CN CN201880076243.XA patent/CN111405953B/zh active Active
  • 2018-11-05 WO PCT/FR2018/052716 patent/WO2019092344A1/fr unknown
  • 2018-11-05 EP EP18808449.5A patent/EP3706946A1/fr active Pending
  • 2018-11-05 US US16/762,822 patent/US20200360999A1/en not_active Abandoned

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