METHOD FOR MANUFACTURING A MAGNETIZED ROTATING COMPONENT, ROTATING COMPONENT AND SYSTEM FOR MEASURING ROTATION OF A ROTATING COMPONENT

Abstract

The invention relates to a method for manufacturing a component able to rotate about an axis, comprising a step of incorporating a magnetic material into the powder during the manufacture of the rotating component, in at least one predefined zone of the component formed. The invention also relates to a rotating component obtained using this method and to a system for measuring rotation of the rotating component obtained by this method, by using at least one sensor able to detect the passage of the zone into which the magnetic material is incorporated.

Claims

1. A method for manufacturing a rotating component, rotating about an axis, comprising: a step of producing a formed component from a material in powder form, a step of obtaining the rotating component from the formed component, wherein the method comprises a step of incorporating a magnetic material into the powder during the production of the formed component, in at least one predefined zone of the formed component, called the magnetized zone, the magnetic material having the following characteristics: a magnetic remanence (Br) greater than or equal to 0.1 T; a Curie temperature (T.sub.c) greater than or equal to 250 C.; a hardness of between 75% and 125% of the hardness of the material of the formed component and a density of between 80% and 120% of the density of the material of the formed component.

2. The method for manufacturing according to claim 1, wherein the magnetic material is a samarium-cobalt, Neodymium, or AlNiCo alloy.

3. The method for manufacturing according to claim 1, wherein the magnetic material is incorporated in particles or a pellet form.

4. The method for manufacturing according to claim 1, wherein the magnetized zone is a zone of the component corresponding to an eccentric zone of the axis of the rotating component.

5. The method for manufacturing according to claim 1, wherein the step of producing the rotating component from the powder and the integration of the magnetic material are carried out by additive manufacturing, preferably by sintering or laser melting.

6. The method for manufacturing according to claim 1, wherein the step of obtaining the rotating component comprises a step of machining the formed component and/or a step of assembling it with another component so as to form the rotating component.

7. A rotating component obtained by a method according to claim 1, wherein it comprises at least one integrated magnetized zone.

8. A measuring system for measuring the speed of rotation of a rotating component according to claim 7, wherein it comprises a plurality of sensors arranged in the proximity of the zone of the rotating component comprising the magnetic material and configured so as to each detect a passage of the magnetic zone in front of each sensor in different angular sectors during the rotation of the rotating component.

9. The measuring system according to claim 8, wherein at least one sensor is arranged in a hollow web of the rotating component.

10. The measuring system according to claim 8, wherein the sensors of the plurality of sensors are configured so as to each detect a passage of a plurality of magnetic zones in different angular sectors.

11. The measuring system according to claim 8, wherein at least one sensor is mobile, the position of said sensor being known at any time with respect to the zone of the rotating component comprising the magnetic material.

Description

5. LIST OF FIGURES

[0052] Other purposes, features and advantages of the invention will appear when reading the following description, which is given only in a non-exhaustive manner and refers to the annexed figures in which :

[0053] FIG. 1 is a schematic view of a method for manufacturing a rotating component according to an embodiment of the invention,

[0054] FIG. 2 is a schematic partial perspective view of a rotating component according to an embodiment of the invention, obtained by the manufacturing method,

[0055] FIG. 3 is a schematic sectional and perspective view of a rotating component and a measuring system for measuring the speed of rotation of the rotating component, according to an embodiment of the invention.

6. DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

[0056] The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to one embodiment. Simple features of different embodiments can also be combined to provide other embodiments. In the figures, scales and proportions are not strictly adhered to for the sake of illustration and clarity.

[0057] FIG. 1 schematically represents a method 10 for manufacturing a rotating component according to an embodiment of the invention. The circles represent the products and the rectangles represent steps allowing the passage from one product to another.

[0058] A first step represented is a step 12 of producing a formed component 16 from a material in powder form 14. This production step, known from prior art, is preferably carried out by additive manufacturing, for example by sintering or laser melting.

[0059] A second step represented is a step 18 of obtaining a rotating component 20 from the formed component 16. This step includes, for example, a machining step of the formed component 16, but may also include other known processing steps in the manufacturing of industrial component.

[0060] The particularity of the method according to the invention is that it comprises a step 21 of incorporating a magnetic material 22, for example in a particles or pellet form, into the powder during the step of producing the formed component 16, in a predefined zone (for example by calculation) of the formed component 16, known as the magnetized zone. Contrary to the techniques of the prior art where a magnetic component was added to the rotating component, the invention allows the incorporation directly during the production of the component.

[0061] FIG. 2 shows schematically and partially in perspective a rotating component 20 according to an embodiment of the invention, obtained by the method for manufacturing as described above. The rotating component 20, here a pinion, thus comprises a magnetized zone 24, here visible on an external face of the pinion.

[0062] FIG. 3 schematically shows a schematic cross-section and perspective representation of a rotating component and a measuring system for measuring the speed of rotation of the rotating component, according to an embodiment of the invention. The rotating component 20 comprises here a magnetized zone 24 arranged inside a hollow web 26 of the rotating component 20. In the centre of the hollow web 26, a sensor 28 of the measuring system is arranged in the region of the axis of rotation of the rotating component 20. The sensor 28 is arranged in such a way that a passage of the magnetized zone 24 in front of it can be detected, so that the speed of rotation of the rotating component 20 can be easily determined as a function of the time elapsed between each passage of the magnetized zone 24. In order to improve the resolution of the measurement, it is possible to use several sensors each detecting the passage of the magnetized zone 24 in a different angular sector. The arrangement of the sensor in the hollow web 26 of the rotating component reduces the space requirement of the measuring system.

[0063] The sensor is a sensor that can detect a change in the surrounding magnetic field, in particular that caused by the magnetized zone. The sensor is for example an active sensor of the Hall effect or magnetoresistance type, or a passive sensor of the eddy current type. More generally, the sensor makes it possible, for example, to provide an output signal with a 0 value when the magnetic field detected is below a reference value and a 1 value when the magnetic field detected is above a reference value.

[0064] The measuring system also includes conventional elements for retrieving the output signal, determining the speed of rotation of the rotating component from the output signal (e.g. calculation unit), supplying the value of the speed of rotation to other equipment, powering the sensor if necessary, etc.

[0065] With a rotating component according to other embodiments, for example as described with reference to FIG. 2, the sensor can be arranged outside the rotating component and not in a hollow web thereof.