Patent Publication Number: US-2023152351-A1

Title: Method for manufacturing an electric component and electric component

Description:
The present invention relates to a method for manufacturing an electrical component and to the electrical component obtainable by such a method. 
     An electric current sensor is used for measuring the value of an electric current flowing through a power line. Such a measurement can be needed for quantifying the power and/or electrical energy consumed by an electrical receiver or for detecting a malfunction in the receiver. It is known how to use as a Rogowski sensor as current sensor which uses one or a plurality of windings of conducting wire about a non-magnetic core, such type of sensor being generally associated with a signal processing circuit including an integrator circuit. 
     The sensor can be e.g. in the form of a conductor winding which extends along a circular or rectangular trajectory. A toroidal winding e.g. is thus obtained, which forms a loop. During use, the power line the current of which is to be measured, is positioned so as to pass through the loop formed by the winding, at the center of the trajectory. The power line is thus radially encircled by the winding. In order to reduce the disturbances for the measurement, it can be provided so that the winding comprises outgoing turns which are criss-crossed with return turns, or that the return turns are wound inside the outgoing turns or parallel under thereto, or that an unwound part of the conductor, coming out from one end of the winding of the outgoing turns, passes back through the inside of the winding in the opposite direction, along the trajectory of said winding. EP3171182A1 gives a few examples on such topic. 
     To construct such type of winding, a copper wire is conventionality wound, sometimes around a core made of polymer plastic with a toroidal shape, sometimes on a multilayer printed circuit board, as described in FR 3 075 387 A1. 
     In order to make the current sensor more compact, FR 3 053 795 A1 provides for the formation of a hybrid sensor, by associating windings with ferromagnetic bars, arranged so as to form openings intended to be crossed by the conductors for which current is to be measured. 
     The accuracy of the measurement depends in particular on the precision of the geometry of the turns and on the regularity of the spatial arrangement thereof. Moreover, a high number of turns is desirable in order to obtain a significant gain. It is thus necessary to provide complex and expensive machines for winding conducting wire. Furthermore, the coiling of the winding limits the density of turns and the wound conductor is likely to deform during use, e.g. under the effect of thermal stresses. Finally, the coiling method and the type of support used, particularly for the printed circuit board, imposes strong geometric constraints on the shape of the winding and of the sensor. 
     The invention thus aims to solve the aforementioned drawbacks of the prior art by proposing a new manufacturing method, aiming at obtaining an electrical component comprising a winding with a high density of turns, a precise arrangement of the turns which is not very variable in time, the manufacturing method making it possible to have a winding design with any desired geometry. 
     The subject matter of the invention is a manufacturing method for an electrical component, preferentially constituting a current sensor. The electrical component includes an armature, which consists of a material comprising a polymeric plastic material and an organometallic additive, the armature including a support arm which extends along a guiding trajectory. The electrical component further comprises a winding, which is formed directly on the surface of the support arm by a conductor track forming turns of the winding, which are distributed along the guiding trajectory and encircle the guiding trajectory. The manufacturing process successively comprises: providing or manufacturing the armature; laser engraving of the support arm for engraving an initiator track forming the turns of the winding and where the organometallic additive is locally activated; and metallizing the initiator track with a conducting metal so as to form the conductor track directly on the surface of the support arm, according to the turns formed by the initiator track. 
     A basic idea of the invention is to form the winding by means of the conductor track traced on the support arm of the armature, rather than in the form of a conducting wire as provided in the prior art. The formation of the initiator track by laser engraving and by activating the additive, then by metallization, are used for forming the conductor track with a high resolution and according to any desired geometry. The conductor track can e.g. have a thickness of less than 15 μm, preferentially being formed by a copper deposition produced by metallization, advantageously coated with a nickel barrier and a gold finish, e.g. of about 5 μm. As a result, a particularly high density of turns can be obtained for the winding, leading to a high compactness of the winding and/or a high gain if the winding of the component is used as a sensor. The turns are characterized e.g. by a pitch of less than 400 μm, e.g. of about 200 μm. The layout of the conductor track is very precise since same is essentially determined by the precision of the laser engraving and by the quality of the metallization. It is easy to obtain any desired shape for the winding, since same depends on the layout of the laser engraving and on the shape of the outer surface of the armature, which can easily be shaped by molding during the manufacture thereof. Since the support arm of the armature is a bulk part, the surface area of each turn can easily be relatively high, in particular compared to a winding of the prior art which would be formed around a printed circuit board, by nature relatively not very thick and often leading to designing turns with a flattened shape. 
     Since the conductor track is intimately linked to the support arm of the armature, same keeps the initial shape thereof over time and is not very sensitive to deformation under the effect of heat, unlike windings consisting of wound conducting wire. 
     As a result of such high quality of the winding, the electrical component obtained by the manufacturing process is particularly suitable for forming a current sensor, in particular a Rogowski sensor, the armature being advantageously suitable for forming a non-magnetic core. 
     Other optional and advantageous features of the invention are described hereinafter. 
     Preferentially, the support arm comprises a first side and a second side, which are opposite and contiguous on both sides of the guiding trajectory, while the laser engraving comprises: laser engraving of a first part of the initiator track on the first side, the first part of the initiator track forming, for each turn, only a first part of the initiator track, and laser engraving of a second part of the initiator track on the second side, only after the engraving of the first part of the initiator track, the second part of the initiator track forming, for each turn, a second part of the turn which completes the first part of said turn. 
     Preferentially, the laser engraving comprises: positioning of the armature so that the first side is oriented facing a laser engraver, so that the laser engraving of the first part of the initiator track is performed by the laser engraver; and repositioning of the armature so that the second side is oriented facing the laser engraver, so that the laser engraving of the second part of the initiator track is performed by the laser engraver. 
     Preferentially, the manufacturing of the armature comprises molding the armature by injecting the material into a mold. 
     Preferentially, the mold comprises: a shaping chamber for shaping the support arm; a first opening for injecting a first portion of the material; a second opening for injecting a second portion of the material; and a joining chamber into which the second opening exits and which communicates with the first opening via the shaping chamber of the support arm. Preferentially, the injection molding comprises: injecting the first portion of the material into the mold through the first opening, such that the first portion of the material: incurs into the shaping chamber of the support arm, the support arm then being entirely formed by the first portion of the material; extends into the joining chamber. The injection molding further comprises injecting of the second portion of the material into the mold through the second opening such that the second part of the material encounters the first portion of the material in the joining chamber, the armature being formed by combining the first portion of the material and the second portion of the material. 
     Preferentially, the first opening and the second opening are arranged in the same plane and along the same orientation, so that: the first opening shapes a first stud of the armature, by injecting the first portion of the material; and the second opening shapes to a second stud of the armature, by injecting the second portion of the material, the first stud and the second stud being configured for positioning the electrical component on a printed circuit board. 
     Preferentially, the manufacturing process comprises: manufacturing or providing a bar of ferromagnetic material, and attaching the bar to an attachment arm belonging to the armature, after providing or manufacturing the armature. Preferentially, the molding includes forming the support arm and the attachment arm in the mold, such that the support arm and the attachment arm are formed in a single piece. 
     Preferentially, the attaching of the bar comprises snap-fitting the bar onto the attachment arm, using supplementary snap-fitting means belonging to the bar and to the attachment arm. 
     Preferentially, the bar attachment comprises: positioning of the bar onto the attachment arm, with threading of a snap-riveting hole which crosses through the bar, along the snap-riveting pin belonging to the attachment arm; and attaching of the bar thus positioned on the attachment arm by snap-riveting, by melting the snap-riveting pin. 
     The invention further relates to an electrical component, which can be obtained by means of the manufacturing method defined hereinabove, the electrical component comprising an armature, which is formed by a material comprising a polymeric plastic and an organometallic additive, the armature comprising a support arm which extends along a guiding trajectory. The electrical component further comprises a winding, which is formed directly on the surface of the support arm by a conductor track forming turns of the winding, which are distributed along the guiding trajectory and encircle the guiding trajectory. 
     Preferentially, the electrical component according to the invention is obtained by using the above-mentioned manufacturing method. 
     As a variant, the electrical component manufactured by the method described hereinabove is an antenna, rather than a current sensor. For such a variant, the winding is configured for being apt to radiate and/or capture electromagnetic waves. In such a case, the electrical component can be integrated into a radio system. 
    
    
     
       The invention will be better understood upon reading the description hereinafter of embodiments of the invention, given only as an example and not limited to, with reference to the drawing enclosed hereinafter. 
         FIG.  1    is an exploded perspective view of an electrical component according to a first embodiment according to the invention. 
         FIG.  2    is a perspective view, from another angle, of the electrical component shown in  FIG.  1   . 
         FIG.  3    schematically shows different steps of a manufacturing process for the electrical component of  FIGS.  1  and  2   . 
         FIG.  4    is a perspective view of an electrical component according to a second embodiment according to the invention. 
         FIG.  5    is an exploded perspective view of an electrical component according to a third embodiment according to the invention. 
         FIG.  6    is an exploded perspective view of an electrical component according to a fourth embodiment according to the invention. 
         FIG.  7    is a perspective view of an electrical component according to a fifth embodiment according to the invention. 
     
    
    
     According to the embodiment shown in  FIGS.  1  to  3   , the electrical component comprises an armature  1 , two windings  2  and two bars  3 . A reference mark is used, which includes a longitudinal direction X 1 , a transverse direction Y 1 , a direction of height Z 1 , mutually perpendicular and fixed with respect to the armature  1 . 
     The component shown in  FIGS.  1  to  3    preferentially form a current sensor. The value of the current of a conductor  6 , essentially parallel to the direction Z 1 , flowing through a guiding trajectory L 7  defined by the component, in the form of a closed loop, inscribed in a plane parallel to the directions X 1  and Y 1 , can be determined by means of the component, a voltage being induced across the terminals of the component as a function of the magnetic flux across said opening  7  along the direction Z 1 . In practice, the armature  1  delimits an opening  7  of the component, in the same plane as the guiding trajectory L 7  and being surrounded by the guiding trajectory L 7 , through which the conductor  6  can cross. Preferentially, such component is a Rogowski sensor and the induced voltage depends on the value of the variation of the current flowing through the opening  7 . 
     Such component is preferentially intended for being mounted on a printed circuit board (not shown), by using the armature  1 , the printed circuit board extending under the component parallel to the directions X 1  and Y 1 . Such component is intended for being connected to an electronic system for sensors, including a conditioning electronic system e.g. in the form of an integrator circuit. 
     The component, in particular the armature  1 , measures e.g. about 25 mm in the direction Y 1  and about 15 mm in the direction X 1 . More generally, the component described herein advantageously has a length of less than 50 mm and a width of less than 40 mm. 
     The armature  1  is formed, preferentially by forming a single piece consisting of a single piece, i.e in one-piece, entirely of the same material. 
     The material comprises a polymeric plastic material, which is preferentially a thermoplastic resin, e.g. polycarbonate (PC), which is relatively easy to be injection-molded, or liquid crystal polymer (LCP), which is particularly heat resistant, which is recommended when soldering on the printed circuit board is expected to be performed. The material further comprises an organometallic additive, integrated into the polymeric plastic material, which is distributed at least across the skin of the armature, or even at the heart. The organometallic additive, in a non-activated state, is electrically non-conducting. The armature  1  is thus electrically non-conducting and non-magnetic, except possibly for any activated part of the organometallic additive, as discussed hereinafter. 
     As shown in  FIGS.  1  and  2   , structurally, the armature  1  extends along the guiding trajectory L 7  and advantageously has a general shape of closed loop, or more generally an annular shape, delimiting at the center thereof, the opening  7 , which crosses through. The armature  1  comprises two support arms  4  and two attachment arms  5 . In the present example, the two support arms  4  are arranged opposite each other, on either side of the opening  7 , so as to delimit the opening. Each support arm  4  extends herein parallel to the direction X 1 . The two attachment arms  5  are arranged opposite each other in front of the opening  7 , so as to delimit the opening. Each attachment arm  5  extends parallel to the direction Y 1 . Each attachment arm  5  extends herein parallel to the direction Y 1 . Each attachment arm  5  connects, by the ends thereof, one end of an arm  4  to another end of an arm  4 . In other words, along the trajectory L 7 , around the conductor  6 , there is an alternation of arms  4  and arms  5 . For the example shown in  FIGS.  1  and  2   , each arm  4  and  5  has a rectilinear shape, or a curved in shape, for turning around the conductor  6 . 
     Each support arm  4  is designed for receiving one of the windings  2  while each attachment arm  5  is designed for receiving one of the bars  3 . In  FIG.  1   , one of the bars  3  is shown disassembled from the armature  1 , while the other bar is shown assembled. 
     Each winding  2  is formed directly on the surface of the support arm  4  concerned. 
     In particular, along the trajectory L 7 , each support arm  4  has a radial outer surface  12 , i.e. a surface in the form of a handle around the trajectory L 7 . At each axial end of the radial surface  12 , i.e. at each axial end of the arm  4 , the arm  4  comprises a corresponding axial surface  13 , i.e. an end surface. Herein, the winding  2  is formed exclusively on the radial surface  12 , whereas the two axial surfaces  13  have no winding. 
     Each winding  2  consists of a corresponding conductor track  10 , i.e. electrically conducting with respect to the material forming the armature  1 , which is electrically insulating. The component shown in  FIGS.  1  and  2    thus comprises two distinct tracks  10 , each forming a separate winding  2 . Each conductor track  10  is formed on the surface of the support arm  4  which carries same, herein on the radial surface  12 . Since each conductor track  10  is very thin, part of one of same is shown in a detailed view D of  FIG.  1   , on a larger scale. 
     Since the electrical component includes one or a plurality of conductor tracks  10  formed on the armature  1  made of polymer plastic, the electrical component can be considered to be a molded interconnect device component, or a molded interconnect device sensor. 
     Structurally, the conductor track  10  forms a continuous flat wire, preferentially without branching, laid flat on the outer surface of the arm  4 . The conductor track  10  is wound in a spiral around the arm  4 , so as to form a succession of turns forming the winding  2 . The turns are distributed successively along the trajectory L 7 , preferentially in a regular manner. Each turn encircles a part of the trajectory L 7 . In other words, the turns are herein distributed parallel to the direction X 1 , whereas each turn is preferentially approximately inscribed in a plane parallel to the directions Y 1  and Z 1 . Since the track  10  is formed directly on the surface of the arm  4 , it is the shape of the radial surface  12  which determines the geometry of the cross-section of each turn and thus the envelope of the winding  2 . In particular, for each turn, the cross-section of the turn corresponds to the outer contour of the cross-section of the arm  4 . Here, each arm  4  advantageously has a tubular shape, or more generally a bulk shape, which encircles the trajectory L 7 . As a result, the winding  2  is a bulk in the directions Y 1  and Z 1 , and can easily have turns of which cross-section covers a large area and has any desired shape. Turns with a circular or elliptical cross-section can advantageously be formed, as is the case in the example shown. Alternatively, it could be provided for that the turns have a square or rectangular cross-section, or any other shape with a desired cross-section, by modifying the shape of the arm  4 , more particularly the radial surface  12  thereof. 
     By virtue of the manufacturing method described below, the track  10  has a track width L 10  which can advantageously be less than 400 μm (micrometers), or even less than 200 μm. The pitch P 10  of the winding  2 , i.e. the distance connecting one turn to the other, is advantageously less than 400 μm, or even less than 200 μm. It is thus possible to obtain a very high density of turns along the trajectory L 7 , e.g. a plurality of turns per millimeter, as well as a very precise layout of the conductor track  10 . In comparison, the cross-section of the winding  2  can be made very large by providing the support arm  4  with any desired shape. In particular, the cross-section of the winding  2  can have a diameter, or otherwise a characteristic size such as a diagonal, which is greater than 3 mm (millimeters), e.g. 5 mm, or even greater than 5 mm. e.g., each turn can have a circumference of about 20 mm. The length of each winding  2 , measured along the trajectory L 7 , can be comprised e.g. between 5 and 15 mm. 
     Preferentially, the support arm  4  forms a non-magnetic core for the winding  2 . If the support arm  4  has a tubular shape, as shown in  FIGS.  1  and  2   , the quantity of air contained in the tube further has the function of a non-magnetic core. 
     Preferentially, to form a magnetic circuit along the guiding trajectory L 7 , the two windings  2  have the turns thereof oriented along the same direction, e.g. the direct direction, i.e. the direction of screwing, along and around the trajectory L 7 . The result of the above is e.g. that one of the windings  2  has the turns thereof oriented along the direct direction with respect to the direction X 1 , and that the other winding  2 —opposite—has the turns thereof oriented along the direct direction with respect to a direction opposite to the direction X 1 . 
     Each bar  3  is made of ferromagnetic material, e.g. a soft iron. Each bar  3  forms a part which is fitted onto the armature  1 , unlike the windings  2  which are integrated therein. 
     Each bar  3  is advantageously in the form of a blade, which extends parallel to the direction Y 1 . The bar  3  comprises two axial ends  14  and a central part  15  connecting the two axial ends  14  to one another. At each of the ends  14  thereof, the bar  3  is in mechanical contact with one of the axial surfaces  13  of one of the arms  4 , parallel to the direction X 1 , i.e. locally, perpendicular to the trajectory L 7 . Each bar  3  thus connects an axial end of the first winding  2  with the end of the other winding, without electrical contact with the tracks  10  forming the windings  2 , respectively, but as close as possible so as to reduce the air-gap. A loop-shaped magnetic circuit is thus obtained along the trajectory L 7 , formed by alternating the windings  2  and the bars  3 . In operation, magnetic field lines extend along the trajectory L 7 . 
     Each attachment arm  5  serves both for supporting the support arms  4 , but also for supporting one of the bars  3 . 
     In order to support the support arms  4  in a fixed manner with respect to each other, each attachment arm  5  comprises a yoke  11 , which structurally connects the end of one of the arms  4  to the end of the other arm  4 . With the arms  4 , the yokes  11  delimit the opening  7  of the electrical component. Each yoke  11  advantageously extends parallel to the directions Y 1  and Z 1 . Each yoke  11  is mechanically attached to the two support arms  4 . For each arm  4 , the yoke  11  is attached to the axial end of the arm  4 , or more generally to a zone of the arm  4  that does not include the winding  2 . Preferentially, as shown in  FIGS.  1  and  2   , the occupation of the axial end of the arm  4  by the yoke  11  is as small as possible, so that the axial surface  13 , reserved for the contact with the bar  3 , is as large as possible. 
     Each attachment arm  5  advantageously comprises a base  20  which extends parallel to the directions X 1  and Y 1 , so that the bases  20  of the two arms belong to the same plane. Each base  20  is attached to the yoke  11  by a longitudinal edge of said yoke  11 , extending parallel to the direction Y 1 . While the yokes  11  and the arms  4  are all arranged in the same plane which includes the trajectory L 7 , the bases  20  are arranged in a parallel plane, offset with respect to the plane of the trajectory L 7 . 
     In order to position the bar  3  onto the armature  1  along the direction X 1 , it is advantageously provided for that the ends  14  rest against the surfaces  13  of the support arms  4  and/or for the central part  15  of the bar  3  to rest against the yokes  11 . The bar  3  is separated by the yoke  11  from the opening  7 . 
     In order to position the bar  3  onto the armature  1  along the direction Z 1 , it is advantageously provided that a longitudinal edge  17  of the bar  3  rests against the base  20  of the arm  5  onto which the bar  3  is received. 
     In order to position the bar  3  on the armature  1  along the direction Y 1 , the attachment arm  5  and the bar  3  advantageously form a stop including a pin  16 , formed herein by the yoke  11  at the intersection between the base  20  and the yoke  11 , outside the opening  7 , and a notch  19 , formed herein by the longitudinal edge  17  of the bar  3 . The positioning of the bar is provided by the reception of the pin  16  inside the notch  19 . 
     Optionally, the positioning of the bar  3  parallel to the direction Y 1  is provided at least in part by a shape match between the bar  3  and the yoke  11  of the arm  5 . As shown in  FIGS.  1  and  2   , the bar  3  advantageously has an arched shape, wherein the central part  15  extends in a first plane, which is parallel to the directions Y 1  and Z 1 , and where the ends  14  both extend in the same second plane which is parallel to the directions Y 1  and Z 1 , the plane of the ends  14  being offset with respect to the plane of the central part. The yoke  11  mates with such particular shape so as to position the bar  3  parallel to the direction Y 1 . 
     To attach the bar  3  onto the armature  1 , the arm  5  concerned comprises snap-fitting lugs  18 , e.g. two lugs  18 . Here, the snap-fitting lugs  18  mate with one of the ends  14 , respectively, of the bar  3 . For this purpose, the lugs  18  are herein carried at longitudinal ends of the base  20  and each extending along the direction Z 1 , so as to be each opposite to one of the surfaces  13 . The pin  16  is thus arranged between the two lugs  18 . Each end  14  advantageously comprises a recess  21  for receiving a protrusion forming a hook, carried by the end of the lug  18 . Once snap-fitted, the bar  3  is caught parallel to the direction Z 1  between the base  20  and the hook of the lug  18 , received in the recess  21 . The lugs  18  and the recesses  21  are an example of matching means of snap-fitting formed by the bar  3  and the arm  5 . 
     The attachment of the bar  3  onto the armature is thus particularly easy, since it suffices to slip on the bar  3  along the arm  5  by moving the bar  3  along a direction opposite to the direction Z 1  with respect to the armature  1 , until the pin  16  is received by the notch  19  and the lugs  18  snap into the recesses  21 . 
     The arrangement of the means for positioning and attaching the bars  3  of the example shown in  FIGS.  1  and  2    advantageously allows the arms to have a plurality of symmetries, which make same interchangeable if need be, which in particular facilitates the manufacture of the electrical component. The bar  3  e.g. is symmetrical with respect to a plane parallel to the directions X 1  and Y 1 , so that each bar  3  comprises two symmetrical longitudinal edges  17 , each having a symmetrical notch  19 . The bar  3  e.g. is symmetrical with respect to a plane parallel to the directions X 1  and Z 1 , so that the ends  14  are interchangeable. 
     Preferentially, the armature  1  further comprises feet  23 , which are better visible on  FIG.  2   . Four feet  23  are preferentially provided. Herein, each foot  23  is formed protruding from one of the attachment arms  5 , in particular from the base  20 , while being oriented along a direction opposite to the direction Z 1 . Each foot  23  is advantageously attached monolithically to the arm  5  which supports same. Each arm  5  comprises, e.g. two feet  23  at the longitudinal ends thereof. It is advantageously provided that, for the same arm  5 , the feet are distributed parallel to the direction Y 1 . For two opposite arms  5 , it is advantageously provided for that the feet are to be distributed in pairs, each pair of feet  23  being parallel to the direction X 1 . Preferentially, each pair of feet  23  is aligned with one of the windings  2 . 
     The electrical component is advantageously designed for being placed on the printed circuit board by means of the attachment arms  5 , in particular by means of the bases  20 , herein more precisely by resting on the four feet  23 . 
     Preferentially, each winding  2  is electrically connected to the electrical circuit of the printed circuit board via two legs  23 . More precisely, each winding  2  has two ends, forming the two terminals of the winding  2  concerned. For each end of the winding  2 , a corresponding auxiliary conductor track  24  advantageously connects the end of the winding  2  to the foot  23 . Preferentially, the track  24  is of the same nature as the conductor track  10  of the winding  2  and obtained by the same method and manufactured at the same time, at the surface of the armature  1 . Electrically, the two windings are advantageously connected in series with each other and with a circuit for processing the signal exiting therefrom. Such connections are preferentially made via the electronic circuit board. Advantageously, the connections of the windings  2  and any return tracks can be expected to be formed directly on the electronic circuit board. In particular, for each winding  2 , a corresponding return track is provided, which extends under the winding  2  concerned, following the guiding trajectory L 7  in the plane of the printed circuit board. Herein, at least a part of each return track is rectilinear and parallel to the direction X 1 , extending under the winding  2  concerned, from one axial end of the winding  2  to the other. The first winding  2 , the first return track, the second return track and the second winding  2  thus follow one another in series. 
     Preferentially, the armature  1  further comprises studs  22 , which can be seen more clearly on  FIG.  2   . Herein, each stud  22  protrude monolithically from one of the attachment arms  5 , in particular protruding from the base  20  opposite the yoke  11 . Each stud  22  protrudes in a direction opposite to the direction Z 1 . Each stud  22  can be advantageously used for positioning and/or attaching the electrical component, in particular along the directions X 1  and Y 1 , on the printed circuit board, which comprises e.g. corresponding holes for receiving the studs  22 . For this purpose, the studs  22  are advantageously arranged in the same plane parallel to the directions X 1  and Y 1  and are oriented along the same direction, herein the direction opposite to the direction Z 1 . 
     The electrical component shown in  FIGS.  1  and  2    is obtained using the manufacturing method as defined hereinbelow and shown in  FIG.  3   . 
     In essence, the manufacturing process successively comprises a supply or a manufacture of the armature  1  shown in box A in  FIG.  3   , then a laser engraving of the armature  1  shown in boxes B and C of  FIG.  3   , then a chemical treatment of the armature  1  including a metallization (not shown), then an assembly of the bars  3  onto the armature  1  shown in box D in  FIG.  3   . 
     The manufacture of the armature  1  preferentially comprises molding the armature  1  by injecting material into a mold, while the material is in a viscous state. One of the mold cavities  30  is shown schematically in box A in  FIG.  3   , while knowing that the mold advantageously comprises another mold cavity, and preferentially cores, in particular for producing the tubular shape of the support arms  4 . The mold is configured for shaping, in a single molding operation, all the parts of the armature  1 , i.e. in particular the arms  4  and  5 , the feet  23  and the studs  22 . 
     As shown in  FIG.  3    for the mold cavity  30 , the mold preferentially comprises chambers  31 ,  32 ,  33  and  34 , the chambers  31  and  32  being designed for shaping each one of the support arms  4 , the chambers  33  and  34  each being designed for shaping one of the attachment arms  5 . Like the armature  1 , the mold has an annular shape about an axis parallel to the direction Z 1 . Thus, the chamber  31  connects the chambers  33  and  34 , the chamber  32  connects the chambers  33  and  34 , the chamber  33  connects the chambers  31  and  32 , the chamber  34  connects the chambers  31  and  32 . 
     In the present example, the mold cavities, including the mold cavity  30 , are closed parallel to the direction Z 1 . Thus, the mold cavity  30  forms the underside of the armature  1 , including herein the studs  22 , the feet  23  and the bases  20 , while the other mold cavity (not shown), forms the top of the armature  1 . 
     The mold also comprises two openings  35  and  36  for the injection of the material into the mold, both of which are herein provided in the mold cavity  30 . In the present example, the opening  35  exits directly into the chamber  33  and the opening  36  exits directly into the chamber  34 . More generally, it is preferred for each opening of the mold to exit into a chamber forming one of the attachment arms  5 , or at least into a chamber which does not form one of the support arms  4 , the radial surface  12  of which must have a flawless state and the structure of which must withstand laser engraving. Advantageously, the openings  35  and  36  shape the studs  22  of the armature  1 . Indeed, the studs  22  are a part of the armature  1  which require lower production precision and mechanical characteristics of lesser quality, in particular with regard to the support arms  4 . 
     For the studs  22  thus obtained to be apt to serve as means for positioning the component on the printed circuit board, provision is advantageously made that the openings  35  and  36  are arranged in the same plane parallel to the directions X 1  and Y 1  and along the same orientation, herein parallel to the direction Z 1 , while being carried by the same mold cavity  30 . 
     From the annular arrangement of the chambers  31  to  34 , it results that the chamber  33  communicates with the opening  36 , along a first direction, only via the chamber  31  and the chamber  34 . Along a second direction, the chamber  33  communicates with the opening  36  only via the chamber  32  and the chamber  34 . The opening  35  exits directly into the chamber  33 . Similarly, the chamber  34  communicates with the opening  35 , along a first direction, only via the chamber  32  and the chamber  33 . Along a second direction, the chamber  34  communicates with the opening  35  only via the chamber  31  and the chamber  33 . The opening  36  exits directly into the chamber  34 . 
     For the molding, due of the annular shape of the mold, provision is made to inject the material both through the two openings  35  and  36 , which are located opposite each other, so as to obtain a correct distribution of the material in the mold. A first part  37  of the material is injected through the opening  35 , and a second part  38  of the material is injected through the opening  36 , simultaneously with the injection of the first part  37 . 
     As shown diagrammatically in box A of  FIG.  3   , the injection of the part  37  of the material leads to a partial incursion of the chamber  33  by the part  37 , to a complete incursion of chamber  31  by the part  37  and by a partial incursion of chamber  34  by the part  37 . One of the two support arms  4  is entirely formed by the part  37  of the material in the chamber  31 . The injection of the part  38  of the material leads to a partial incursion of the chamber  34  by the part  38 , to a complete incursion of the chamber  32  by the part  38  and to a partial incursion of the chamber  33  by the part  38 . The other support arm  4  is entirely formed by the part  38  of the material in the chamber  32 . One of the studs  22  is shaped by the opening  35 , being entirely formed by the part  37  of the material. The other stud  22  is shaped by the opening  36 , being entirely formed by the part  38  of the material. 
     Each part  37  and  38  of the material extends into the chambers  33  and  34 , where the parts  37  and  38  meet. Each chamber  33  and  34  thus serves as a joining chamber between the parts  37  and  38  of the material. In the chamber  33 , the joining between the parts  37  and  38  of the material takes place at a welding plane  39 . In the chamber  34 , the joining between the parts  37  and  38  of the material takes place at a welding plane  40 . Each arm  5  is thus formed by the combination of the two parts  37  and  38  of the injected material. The armature  1 , in particular the arms  4  and  5 , is formed in one piece with the same material injected at one time into the same mold, although in two parts  37  and  38 . 
     More generally, the mold is advantageously configured so that the possible welding planes  39  and/or  40  form outside the chambers  31  and  32 , e.g. in the chambers  33  and/or  34 . In the finished armature  1 , the possible welding planes are thus situated outside the support arms  4 , which gives same all the production resistance and precision needed for the subsequent operations aimed at forming the tracks  10 . In the present example, the possible sealing surfaces are formed at the attachment arms  5 , the qualities of which are less critical than the qualities of the support arms  4 . 
     Once the armature  1  was manufactured as described above, the armature  1  is engraved by laser, as shown in boxes B and C in  FIG.  3   . In particular, for each support arm  4 , a corresponding initiator track is laser-engraved, which will later serve as the basis for forming the conductor track  10  of the support arm  4 . If it is desired to produce the aforementioned auxiliary conductor tracks  24 , corresponding auxiliary initiator tracks are also formed during such step, according to the same method as for the initiator tracks intended for forming the conductor tracks  10 . 
     The material of the armature  1  is specially designed for forming the initiator track  50  by laser engraving, e.g. using any appropriate laser engraver  51 . The term “laser engraver” refers e.g. to an apparatus comprising both a source of a laser beam, means for orienting the laser beam, e.g. a set of orientable mirrors, and means for focusing the laser beam, such as a set of lenses. 
     Using the laser locally on the surface of the material leads to the formation of the initiator track  50 , which can be drawn, with any desired layout, by using the laser. The initiator track  50  differs from the rest of the surface of the armature  1  in that same consists of activated parts of the organometallic additive, whereas the organometallic additive is in a non-activated state for the rest of the armature  1 . In addition, the initiator track differs from the rest of the surface of the armature  1  in that same forms a groove, or at least in that same has a more abrasive surface condition. 
     Preferentially, the organometallic additive is formed by a metal complex comprising a metal core, e.g. a copper core, which, in the non-activated state, is covalently bonded to the polymeric plastic material. Such organometallic additive is apt to be activated selectively, on the surface of the armature, by local and selective application of appropriate laser radiation, e.g. pulsed infrared laser radiation. To activate the organometallic additive, the laser radiation breaks the complex, releasing the metal core only where the radiation is applied. More precisely, the laser leads to a metal reduction in the complex, the core then being in metallic form, herein metallic copper. Furthermore, the laser radiation locally heats the surface of the material and causes a local increase in surface roughness by partial ablation of the polymeric plastic material. 
     For each arm  4 , the laser engraving aims to form the initiator track  50  on the arm  4  so that the initiator track  50  has exactly the same layout as the conductor track  10  which is desired to be formed. Consequently, for each arm  4 , the initiator track  50  is arranged on the outer surface of the arm  4 , in particular only on the radial surface  12 . The initiator track  50  is wound in a spiral around the arm  4  so as to form a succession of turns which will form the winding  2  at a subsequent step of the process. 
     For performing the laser engraving, two successive sub-steps are preferentially performed, as shown in boxes B and C, respectively. 
     Each support arm  4  is divided into a side  52  and a side  53  which are opposite and contiguous on either side of the guiding trajectory L 7 . The side  52  forms a part, e.g. half, of the surface  12 , while the other side  53  forms the other part of the surface  12 . The combination of the two sides  52  and  53  forms the entire surface  12 . The sides are e.g. separated by a median plane of the arm  4 , oriented parallel to the directions X 1  and Y 1 . 
     Firstly, as shown in box B, the armature  1  is positioned so that the side  52  is oriented facing the laser engraver  51 . In other words, the armature  1  is arranged so that the side  52  can be engraved by the laser engraver  51 . In such orientation, the laser engraving of a first part  54  of the initiator track  50  is performed only on the first side  52 . The part  54  thus engraved begins the formation of all the turns of the initiator track  50 , by forming for each turn, only a first part of said turn, while the second part of the turn remains to be engraved. Half-turns are engraved on the side  52  of the arm  4 , as shown in box B. Once the side  52  has been engraved, the armature  1  is repositioned so that the side  53  is oriented facing the laser engraver  51 . A second part  55  of the initiator track  50  can then be engraved on the side  53 , so as to complete the first part  54 , as shown in box C. The second part  55 , occupying the side  53 , consists in forming for each turn, the portion matching the portion formed by the first part  54 . The combination of the two parts  54  and  55  thus forms the entire initiator track  50 . 
     The auxiliary initiator tracks are also formed during one of such steps, e.g. while the armature is in the position shown in box C. 
     To change from side  52  to side  53 , it is preferred that the armature  1  is turned over, e.g. by a person or by a robotic arm, while the position of the laser engraver  51  is not changed, except for a simple orientation of the laser beam for drawing the initiator track  50 . 
     Preferentially, once the laser engraving was carried out, the armature  1  is cleaned so to remove any debris caused by such operation. 
     The engraved initiator tracks  50  and any possible auxiliary initiator tracks are not sufficiently electrically conducting for the electrical component to work. The armature  1  is thus chemically treated so as to grow the conductor tracks. 
     The chemical treatment consists first of all of metallizing the initiator tracks  50  for forming the conductor tracks  10  and any auxiliary conductor track  24 , directly on the surface of the armature  1 . The metallization leads to a growth of the initiator tracks, while the rest of the surface of the armature  1  remains electrically insulating. 
     The term “metallization” refers e.g. to an autocatalytic metallization. The armature carrying the initiator tracks is immersed in a solution comprising metal ions of the metal with which it is desired to form the conductor tracks, e.g. copper. The solution comprises e.g. a metal salt containing the metal ions, herein copper ions, a reducing agent for reducing the metal ions. By a redox reaction, the metal of the metal ions is deposited only on the initiator tracks without being deposited on the rest of the surface of the armature  1 , the initiator tracks being a catalyst for the redox reaction. The metal layer deposited by such process is a catalyst for the deposition of more metal by a redox reaction. In this way, the conductor tracks grow through the metallization. Mechanically, the conductor tracks thus formed are strongly rigidly attached to the polymer plastic material by the mechanical anchoring thereof to the asperities formed by the abrasive character of the surface of the armature  1 , due to the laser engraving. 
     Preferentially, once the conductor tracks have been formed by metallization, the chemical treatments include the deposition of finishing layers for protecting the conductor tracks. For this purpose, e.g. an ENIG (Electroless Nickel Immersion Gold) process is used. For this purpose, a nickel-phosphorus layer is first applied by autocatalytic metallization on the free face of the conductor tracks, i.e. the face opposite the surface of the armature  1 . Such autocatalytic metallization is advantageously performed after the copper conductor tracks have been activated with palladium. Then, an external gold layer is applied, e.g. by chemical shift. The gold layer prevents the oxidation of the coated conductor tracks, while the nickel-phosphate layer prevents the migration of gold to copper. 
     At the end of the chemical treatments for forming the conductor tracks, the bars  3  are attached to the armature  1 , namely to the attachment arms  5 , as shown in box D in  FIG.  3   . The bars are attached herein by snap-fitting using snap-fitting lugs  18 , once the armature  1  has been molded and coated with the conductor tracks. In the present example, to perform such attachment, the bar  3  is slipped onto the arm  5  by moving the bar  3  along a direction opposite to the direction Z 1  with respect to the armature  1 , until the pin  16  is received by the notch  19  and the lugs  18  snap into the recesses  21 . 
     The component is then advantageously finished. 
     In a variant, a single support arm  4  could be provided carrying a winding  2 , without any attachment arm  5  and thus without any bar, the support arm  4  and the winding  2  thereof extending over all or most of the guiding trajectory L 7 . In such a case, the single support arm  4  and the winding thereof would have the shape of a loop, or at least the shape of a “C”. As a variant, there could be a single support arm  4  carrying a single winding  2  and a single attachment arm  5  carrying a single bar  3 , the attachment arm  5  connecting therebetween the ends of the support arm  4 . As a variant, more than two support arms  4  may be provided, carrying as many windings  2 , and, if appropriate, more than two attachment arms  5 , carrying as many bars  3 . It is advantageously provided that, along the guiding trajectory L 7 , two successive support arms  4 , each carrying a corresponding winding  2 , are separated by an attachment arm  5  carrying a bar  3 . However, it is possible to provide two immediately successive support arms  4 , each carrying a corresponding winding  2 . 
     The electrical component of the embodiment shown in  FIG.  4   , as well as the manufacturing method thereof, are identical to the electrical components of the embodiment of  FIGS.  1  to  3   , except for the differences mentioned hereinbelow. In particular, the electrical component of  FIG.  4    comprises an armature  1 , two windings  2 , carried by two support arms  4 , respectively, of the armature  1 , and two bars  3 , carried by two attachment arms of the armature  1 . The same reference signs are used for similar elements between the embodiment shown in  FIGS.  1  to  3    and the embodiment shown in  FIG.  4   . 
     Unlike the embodiment shown in  FIGS.  1  to  3   , the embodiment shown in  FIG.  4    provides that each arm  5  comprises snap-fitting lugs  118 , instead of lugs  18 , which have a double function, in that same ensure both the snap-fitting and the positioning of the bar  3  concerned, parallel to the direction Y 1 . Herein, each snap-fitting lug  118  correspondingly mates with a notch  121 , provided e.g. in the corner of one of the ends  14  of the bar  3 , both for snap-fitting and for the positioning parallel to the direction Y 1 . It is not necessary to provide the recesses  21 . Each arm  5  includes two lugs  118 , carried at longitudinal ends of the base  20  and each extending along the direction Z 1 . Each bar  3  has two notches  121  corresponding to the two lugs  118 . Each notch has a face parallel to the directions Z 1  and X 1 , resting against the lug  118  so as to provide the positioning parallel to the direction Y 1 . Each notch  121  has a face parallel to the directions X 1  and Y 1 , which allows the bar  3  to be caught between a hook formed at the end of the lug  118  and the base  20 , parallel to the direction Z 1 , so as to achieve the snap-fitting of the bar  3 . 
     In such embodiment, the pin  16  and the notch  19  are not needed. 
     In order to reinforce the positioning of the bar  3 , the attachment arm  5  advantageously comprises a stabilizing blade  116  which is attached to the base  20  by protruding therefrom along the direction Z 1 . The blade  116  is arranged between the two lugs  118  so as to come into contact with the central part  15  of the bar  3 . The central part  15  of the bar is thus slipped on between the blade  116  and the yoke  11  of the arm  5 , so as to be caught parallel to the direction X 1 . Preferentially, provision is made that the central part  15  of the bar  3  is nipped between the yoke  11  and the blade  116 . The blade  116  takes up part of the forces applied to the bar  3  parallel to this direction, which reduces the risk of breakage of the lugs  118 . 
     The electrical component of the embodiment shown in  FIG.  5   , as well as the manufacturing method thereof, are identical to the electrical components of the embodiment of  FIGS.  1  to  3   , except for the differences mentioned hereinbelow. In particular, the electrical component of  FIG.  5    comprises an armature  1 , two windings  2 , carried respectively by two support arms  4  of the armature  1 , and two bars  3 , carried by two attachment arms of the armature  1 . The same reference signs are used for similar elements between the embodiment shown in  FIGS.  1  to  3    and the embodiment shown in  FIG.  5   . 
     Unlike the embodiment shown in  FIGS.  1  to  3   , the embodiment shown in  FIG.  5    provides that each arm  5  comprises holding lugs  218 , instead of the snap-fitting lugs  18 . Each arm  5  comprises, e.g., two holding lugs  218  which protrude from the base  20  along the direction Z 1  at the longitudinal ends of the base  20 . Each end  14  of the bar  3  is positioned, parallel to the direction X 1 , between one of the lugs  218  and the axial surface  13  of the support arm  4 , being slipped on, preferentially without snap-fitting, between the lug  218  and the axial surface  13 . It is thus not necessary to provide the recesses  21  or the notches  121 . 
     In the embodiment shown in  FIG.  5   , the bar  3  does not have the notch  19  and the arm  5  does not have the pin  16 . Instead, the arm  5  advantageously comprises a snap-fitting lug  216 , which mates with a snap-fitting opening  219  which crosses through the central part  15  of the bar  3 . The snap-fitting lug  216  is advantageously arranged between the lugs  218 . In order to have good mechanical resistance, the snap-fitting lug  216  is e.g. attached to the base  20  by means of a gate  225 , but could alternatively protrude directly from the base  20  in a similar manner to the lugs  18  shown in  FIGS.  1  and  2   . The gate  225 , which is arranged between the lugs  218 , further provides a function similar to the function of the lugs  218 , since the central part  15  is slipped on between the gate  225  and the yoke  11 , which positions the bar  3  parallel to the direction X 1 . The combination of the lugs  218 , of the gate  225  and of the arched shape of the bar  3 , matching the shape of the yoke  11 , provides the positioning of the bar parallel to the direction Y 1 . The snap-fitting lug  216  of the arm  5  is received in the opening  219  of the bar  3 , which attaches the bar  3  to the arm  5  by snap-fitting. 
     The electrical component of the embodiment shown in  FIG.  6   , as well as the manufacturing method thereof, are identical to the electrical components of the embodiment of  FIGS.  1  to  3   , except for the differences mentioned hereinbelow. In particular, the electrical component of  FIG.  6    comprises an armature  1 , two windings  2 , carried respectively by two support arms  4  of the armature  1 , and two bars  3 , carried by two attachment arms of the armature  1 . The same reference signs are used for similar elements between the embodiment shown in  FIGS.  1  to  3    and the embodiment shown in  FIG.  6   . 
     Unlike the embodiment shown in  FIGS.  1  to  3   , the embodiment shown in  FIG.  6    does not provide any snap-fitting of the bars  3 , but instead provides an attachment of the bars by snap-riveting, as explained hereinbelow. This results in a simplified design for the bars  3  and the arms  5 . On the other hand, the material of the armature  1  has to be compatible with the snap-riveting, i.e. has to be re-meltable. Provision should be made e.g. that the polymeric plastic material of the armature  1 , or at least of the arms  5 , is thermoplastic. 
     As shown in  FIG.  6   , the bar  3  has no recesses  21  and no notches  19 . The bar  3  is provided, preferentially through the central part  15  thereof, with a snap-riveting hole  319 , crossing through the bar  3  parallel to the direction X 1 . 
     As shown in  FIG.  6   , the arm  5  has no lugs  18  and no pin  16 . The arm  5  is provided, preferentially protruding from the yoke  11  parallel to the direction X 1 , with a snap-riveting pin  316 , matching the hole  319 . In addition to the positioning of the bar  3  performed using the base  20  and the yoke  11 , the bar  3  is positioned on the snap-riveting pin  316  using the snap-riveting hole  319 , parallel to the direction X 1 . 
     In order to assemble the bar  3  on the armature  1  for the embodiment shown in  FIG.  6   , the bar  3  is slipped onto the pin  316 , the pin  316  being received in the hole  319  of the bar  3 , while positioning the bar  3  on the arm  5  of the armature  1 , e.g., with the edge  17  of the bar guided by the base  20  and the bar  3  resting against the yoke  11 . 
     Then, the bar  3  thus positioned is attached onto the attachment arm  5  by snap-riveting, which involves heating the pin  316 , leading to a localized melting of the material of the armature, so as to form a neck at the end of the pin  316 . Once the pin  316  has solidified with the neck thereof, the bar  3  is caught parallel to the direction X 1  between said neck and the yoke  11 . The bar  3  is then permanently attached to the armature  1 . 
     This method of attachment the bar  3  has the advantage that the connection between the bar  3  and the armature  1  is very resistant and irreversible, and that the bar  3  can have the same symmetries as for the embodiment shown in  FIGS.  1  to  3   , so that same can be mounted indifferently on one side or the other of the armature  1  during the manufacture of the component. 
     The manufacturing method described for the embodiments shown in  FIGS.  1  to  6    can be applied to the electrical component of the embodiment shown in  FIG.  7   . Such electrical component comprises two windings  402  and an armature (not shown). 
     A reference mark is used including a longitudinal direction X 401 , a transverse direction Y 401  and a height direction Z 401 , perpendicular to each other and fixed with respect to the armature of the electrical component of  FIG.  7   . 
     The component shown in  FIG.  7    is preferentially a current sensor. The value of the current of a conductor  406  can be determined using the electrical component, when the conductor crosses through a guiding trajectory L 407  defined by the component, with the shape of a closed loop, which is herein circular, being centered on an axis Z 406  parallel to the direction Z 401 . In practice, the armature of the component delimits an opening  407  of the component, in the same plane, parallel to the directions X 401  and Y 401 , as the guiding trajectory L 407  and being surrounded by the guiding trajectory L 407 , through which the conductor  406  can be fitted. Preferentially, such component is a Rogowski sensor and the induced voltage depends on the value of the variation of the current flowing through the opening  407 . 
     Such component is intended for being connected to an electronic system for sensors, including a conditioning electronic system e.g. in the form of an integrator circuit. 
     The armature is a single one-piece with annular shape, forming a circular crown about the axis Z 406 , following the trajectory L 407 , entirely made of the same material as the material of the armature  1  described hereinabove. 
     The component has a symmetrical structure with respect to a plane P 406  comprising the axis Z 406  and parallel to the direction Y 401 . 
     The armature comprises two support arms. The armature has no attachment arms, the component not comprising any bar. 
     For the embodiment shown in  FIG.  7   , a first support arm forms a first part, herein half of the armature, extending along the trajectory L 407  on a first side of the plane P 406 . The other support arm extends symmetrically on the other side of plane P 406 . Each support arm thus has the shape of a portion of a crown. Herein, each support arm has a square cross-section, but any desired shape of cross-section could be provided. The support arms are attached to each other by the two ends thereof so that the armature has the shape a closed loop about the axis Z 406 . 
     Each support arm receives one of the windings  402 , formed directly on the surface of the corresponding support arm thereof by a corresponding conductor track  410 . The component thus comprises two distinct tracks  410 , each forming a winding  402  separate from the other winding  402 . Each conductor track  410  is produced by the same method as the conductor tracks  10  of the components shown in  FIGS.  1  to  6   . In particular, for each winding  402 , a laser engraving of an initiator track is performed on the support arm concerned, for drawing the layout of the future conductor track  410 . The armature is then metallized for forming the two conductor tracks only at the location of the two initiator tracks engraved on the support arms. 
     Each conductor track  410  is wound in a spiral around the corresponding support arm thereof, so as to form a succession of turns forming the winding  402  concerned. The turns are distributed successively along the trajectory L 407 , preferentially in a regular manner. Each turn encircles a part of the trajectory L 407 , so that each winding  402  extends over the entire part of the trajectory extending on the same side of the plane P 406 . Since each track  410  is formed directly on the surface of the corresponding support arm thereof, it is the contour of the cross-section of the support arm, herein with square shape, which determines the geometry of the cross-section of each turn and thus the envelope of the winding  402 . 
     In the present example, the two windings  402  have the turns thereof oriented in opposite directions. One of the windings  402  has e.g. the turns thereof along the direct direction along the trajectory L 407 , while the other winding has the turns in the indirect direction thereof. Preferentially, each support arm forms a non-magnetic core for the winding  402  thereof. 
     The component further comprises means for electrically connecting the windings  402 . The first winding  402  has a terminal  491  and a terminal  492 , positioned at the ends of the winding  402 , at the plane P 406 . The second winding  402  has a terminal  493  and a terminal  494 , at the plane P 406 . Such different terminals  491  to  494  are preferentially intended for being connected and routed via tracks of a printed circuit board on which the component is designed for being positioned. 
     The terminal  491  is provided e.g. for forming a first terminal of the component intended for being connected to a signal processing circuit. The terminal  492  is connected to a first return track formed on the printed circuit board, the first return track extending under the winding  402  carrying the terminal  492  following the guiding trajectory L 407 , in the opposite direction to the winding, until reaching the terminal  493 , so that the first return loop connects in series, the first winding  402  to the second winding  402 . The terminal  494  is connected to a second return track, formed on the printed circuit board, the second return track extending under the winding  402  carrying the terminal  494 , symmetrically to the first return track with respect to the plane P 406  following the guiding trajectory L 407 , in the opposite direction to the winding  402 . The opposite end of the second return track forms the second terminal of the component. The first winding  402 , the first return track, the second winding  102  and the second return track thus follow one another in series. 
     A manufacturing method is used for manufacturing the component shown in  FIG.  7   , comprising a supply or a manufacture, preferentially by molding, of the armature, then a laser engraving of the support arms of the armature so as to form the initiator tracks according to the layout of the future windings  402 , then finally chemical treatments, including a metallization of the initiator tracks for growing the conductor tracks  410  forming the windings  402 . In particular, like for the case shown in  FIG.  3   , boxes B and C, the laser engraving of the armature of the embodiment shown in  FIG.  7    can be carried out in two steps by turning the component upside down. 
     Any feature described hereinabove for one embodiment or a variant can be implemented for the other embodiments and variants described hereinabove.