EP2673961A1 - Magnetic motor device of an electrodynamic transducer - Google Patents

Magnetic motor device of an electrodynamic transducer

Info

Publication number
EP2673961A1
EP2673961A1 EP12707877.2A EP12707877A EP2673961A1 EP 2673961 A1 EP2673961 A1 EP 2673961A1 EP 12707877 A EP12707877 A EP 12707877A EP 2673961 A1 EP2673961 A1 EP 2673961A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
cylindrical
metal
tubular
annular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12707877.2A
Other languages
German (de)
French (fr)
Inventor
Claire Peteul-Brouillet
Mathias Remy
Guy Lemarquand
Gael Guyader
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP2673961A1 publication Critical patent/EP2673961A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H02K41/0352—Unipolar motors
    • H02K41/0354—Lorentz force motors, e.g. voice coil motors
    • H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
    • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/041—Voice coil arrangements comprising more than one voice coil unit on the same bobbin
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/022—Cooling arrangements

Definitions

  • the present invention relates to an electrodynamic transducer magnetic motor device comprising an annular connected magnet and a tubular element supporting a coil mounted to move in translation coaxially with respect to the annular bonded magnet.
  • Such a device is particularly, but not exclusively, intended to enter the composition of the electrodynamic speakers.
  • Known magnetic motor devices comprise on the one hand fixed elements, an annular permanent magnet, two metal rings containing iron coaxially sandwiching the permanent magnet forming field plates, and a core also containing coaxially mounted iron.
  • a coiled cylindrical support coaxially held in the air gap between the magnet and the core is a membrane connected to the wound cylindrical support.
  • the cylindrical wound support is for example made of cardboard and it comprises windings son, for example copper, and the power supply of these son causes the axial movement of the wound support in the air gap and therefore the movements of the membrane. It is these movements of the membrane that then cause the vibration of the air and generate the sound.
  • EP 2 1 14 086 is a magnetic motor device, without field plates, but whose permanent magnet is an annular bonded magnet, of a particular shape having a cylindrical surface and to opposite a convex surface.
  • This document notably discloses a magnetic device whose bonded magnet is installed inside the wound support, the bonded magnet having an outer cylindrical surface which extends opposite the windings of wires and a convex surface which extends towards inside the magnet.
  • This convex surface is such that the trace of an axial plane of the bonded magnet and the convex surface is a hemi-ellipse.
  • the outer cylindrical surface has two cylindrical portions opposite to each other with respect to the median plane of the magnet.
  • the field lines extend, from one part to the other inside the magnet parallel to the curvature defined by the surface of the emi-elliptical cone and in cutting substantially perpendicularly the cylindrical surface. This effectively concentrates the magnetic field to the wire windings of the wound support.
  • the field lines do not close easily beyond the coiled carrier opposite the magnet.
  • the document EP 2 1 14 086 discloses the implementation of a magnet connected around the wound and symmetrical support of that which is housed inside so as to close the field lines to obtain a better linearity of the magnetic field. and limit magnetic leakage.
  • the implementation of an additional magnet around the wound support increases the weight and the volume of the magnetic motor device.
  • the bonded magnets, plasto-magnets or elasto-magnets are low conductors of thermal energy and therefore, the thermal energy generated in the coil, where the temperature can reach 170 ° C, is very difficult to dissipate.
  • a problem that arises and that aims to solve the present invention is to provide a magnetic motor device that not only allows to limit the magnetic leakage field but also the accumulation of thermal energy.
  • the present invention provides an electrodynamic transducer magnetic motor device comprising, on the one hand, an annular connected magnet generating a magnetic field, and on the other hand a tubular element mounted coaxially with said annular bonded magnet, said magnet annular bond having a magnetic cylindrical surface, while said tubular element comprises a coil extending facing said magnetic cylindrical surface, said tubular element being intended to be driven axially with respect to said annular bonded magnet when said winding is supplied with electric current .
  • the device further comprises a metal tubular member having a cylindrical metal surface, and said metal tubular member is mounted coaxially with said tubular member so that said cylindrical metal surface extends opposite said surface cylindrical magnetic with respect to said winding so as to close said magnetic field.
  • a feature of the invention lies in the implementation of the tubular metal member opposite the annular bonded magnet relative to the wound tubular member, so as to close the magnetic field.
  • the leakage field is very limited in comparison with conventional structures and the magnetic field is concentrated through the coiled tubular element.
  • the thermal energy generated in the coil easily dissipates through the tubular metal member, which by nature is a good thermal conductor.
  • the tubular metal member for example made of an iron alloy, makes it possible to improve the dimensional tolerances of manufacture.
  • said annular bonded magnet which is obviously a solid solid, advantageously has a surface opposite to said magnetic cylindrical surface, the intersection of which with an axial plane of said annular bonded magnet is a half-ellipse.
  • a hemi-ellipse is a curve defined by an ellipse cut along one of these two axes, either along its minor axis that extends between its two centers, or along its major axis that precisely intersects the two centers.
  • the magnetic field lines extend, in an axial plane, a cylindrical portion located on one side of the median plane of the annular bonded magnet towards the other, through the magnet while marrying the curvature defined by the opposite hemi-elliptical surface and substantially perpendicularly cutting the cylindrical surface of the magnet. They thus pass radially through the coiled tubular element, then radially join the metal tubular member and then flex and extend therethrough in an axial direction as will be explained in more detail in the following description.
  • said opposite surface has a truncation forming a truncated cylindrical surface substantially parallel to said magnetic cylindrical surface.
  • said magnetic cylindrical surface of said annular bonded magnet has two cylindrical first half-surfaces, while said annular bonded magnet generates a magnetic field B, and the ratio of the first cylindrical half-surface and the straight section of the tubular member.
  • metallic factor of said magnetic field B is smaller than the value of the magnetic saturation threshold of the material of said metal tubular member.
  • the cross section of the tubular member corresponds to the surface of this cross section and therefore unlike the outer radius and inner radius surfaces of the tubular member.
  • the required thickness of the metal tubular member is easily determined, and in particular it is avoided to a tubular organ is too bulky and heavy.
  • the ratio of the first cylindrical half-surface and the cross section of the metal tubular member factor of said magnetic field B is less than 1.5 when said metal tubular member is made of iron.
  • said cylindrical metal surface has two cylindrical second half-surfaces located in the axial extension of one another and also divided by a median plane of the tubular member, while said winding is divided into two windings axially spaced from each other and able to extend respectively opposite said second cylindrical half-surfaces.
  • the two windings spaced axially from each other consist of a single wire, but wound in the opposite direction.
  • the two windings are then respectively adjusted to the right of the two opposite parts of the annular bonded magnet, so that the two bundles of field lines passing through the two windings are oriented in the opposite directions from one another.
  • the forces exerted on the coiled tubular element are double, which increases the power of the motor device.
  • said annular bonded magnet is mounted within said tubular member, while said metal tubular member extends around said tubular member.
  • said thermal energy generated in the windings can dissipate through the metal tubular member and radially outwardly of the motor device, when space is free around it.
  • said metal tubular member is mounted inside said tubular element, while said annular bonded magnet extends around said tubular element.
  • FIG. 1 is a schematic axial sectional view of a magnetic motor device according to the invention according to an alternative embodiment
  • Figure 2A is a partial schematic view in axial section of detail of Figure 1;
  • Figure 2B is a corresponding graph of Figure 2A showing the intensity of the local magnetic field.
  • Figure 3 is a schematic view similar to Figure 2A illustrating the dimensional references.
  • FIG. 1 illustrates an alternative embodiment of an electrodynamic transducer magnetic motor device 10. It comprises a receiving part 12 connected to a base 14.
  • the receiving part 12 comprises a frustoconical part 16 integral with a tubular part to circular base 18.
  • the frustoconical portion 16 supports a membrane 20, while the tubular portion 1 8 includes coaxially along the axis of the device Z, a tubular member 22 forming a support and secured to the membrane 20, an annular bonded magnet 24 located at the inside of the tubular element 22 and a metal tubular member 26 surrounding the tubular element 22.
  • the tubular element 22 is made of cardboard, aluminum, polyimide or glass fibers or in a composite material.
  • the tubular element 22 has a first cylindrical rim 28 of tubular element near the attachment to the membrane 20 and a second cylindrical rim 30 of tubular element spaced from the attachment to the membrane 20.
  • it comprises a first winding 32 of a conductive wire of copper, aluminum or any other alloy of these materials, or in some cases silver, located near the first cylindrical rim 28 of tubular element and a second winding 34 of said conductive wire in the opposite direction located near the second cylindrical rim 30 of tubular element.
  • the two windings 32, 34 are connected by the same conductive wire.
  • the annular connected magnet 24 In the tubular part 18 and inside the tubular element 22 extends the annular connected magnet 24. It has an outer cylindrical magnetic surface 36 which extends opposite and at a distance from the tubular element 22, and the opposite, inwardly, an opposite surface 38 having, in the plane of the figure corresponding to an axial plane of the annular bonded magnet 24, a contour in the form of a half-ellipse.
  • the annular bonded magnet 24 has a first median plane P M i perpendicular to the Z axis of the device.
  • the annular bonded magnet 24, in its outer cylindrical magnetic surface 36, has in its upper portion, above the median plane P M i, an outer cylindrical upper half-surface 40 extending facing the first winding 32 of conducting wire and in its lower part, below the median plane P M i, a cylindrical outer half-surface 42 extending opposite the second winding 34 of conductive wire.
  • annular connected magnet 24 is held in a fixed position with respect to the tubular portion 18, for example via the base 14.
  • the metal tubular member 26 for example made of iron, is also held in a fixed position inside the tubular part 18 and it extends coaxially around and at a distance from the tubular element 22. It presents a second median plane P M2 coincides, in Figure 1, with the first median plane P M i of the annular bonded magnet 24. As will be explained in more detail below, the tubular element 22 is free compared to the annular bonded magnet 24 and the metal tubular member 26, and is axially movable relative thereto.
  • the tubular metal member 26 has a cylindrical inner surface 45 divided into two cylindrical inner half-surfaces opposite one another with respect to the second median plane P M2 , an upper half-inner cylindrical surface 44 which extends facing the first winding 32 of conductive wire, and opposite to the second median plane P M2 a lower cylindrical inner surface 46 which extends opposite the second winding 34 of conductive wire.
  • the coiled tubular element 22 is installed optimally in an annular chamber 47, or air gap, which extends between the metal bung member 26 and the annular bonded magnet 24. It is axially movable about a rest position so as to drive the diaphragm 20.
  • FIG. 3 is a detailed view showing a hemisection of the annular bound magnet 24 and of the tubular metal member 26.
  • the annular bonded magnet 24 has a radius R and a height H from the median plane P M i and corresponding to the height of the outer cylindrical upper half-surface 40, whereas the metallic tubular member 26 has a thickness E and an inner radius R2.
  • This thickness E is determined with respect to the maximum field density before saturation of the material, and in this case iron.
  • the ratio between the outer cylindrical half-surface of the annular connected magnet 24, in the air gap 47, and the cross-section of the metallic tubular member 26 along the second median plane P M 2, a factor of the magnetic field conferred by the annular bonded magnet 24, must be less than the value of the magnetic saturation threshold of the material used, for example 1, 5 for the iron.
  • annular connected magnet 24 a radius R of 10 mm, a height H of 6 mm, corresponding to a total half-height of the annular bonded magnet 24, for a magnetic field of 0.4 T (Tesla) conferred by a neodymium charge of the annular bonded magnet and for the metal tubular member 26, an inner radius R2 of 1 1 mm defining an air gap 47 of 1 mm, and a thickness of the metallic tubular member 26 E of 2 mm, a field density is obtained in the tubular metal member 26 close to 1.0 T. This value is less than 1.5 T.
  • FIG. 2A showing the magnetic field lines 48 which extend between the annular bonded magnet 24 and the metal tubular member 26 and to describe the advantages of the magnetic motor device according to the invention. Also in this Figure 2A partially, the tubular element 22 provided with its two windings, the first 32, and the second 34.
  • the curved magnetic field lines 48 extend inside the annular connected magnet 24, in an axial section, substantially parallel to the opposite surface 38 of the magnetic cylindrical surface 36 external, to respectively open perpendicularly in the two half-surfaces 40, 42.
  • These magnetic field lines 48 are here, in Figure 2A, oriented in the direction of clockwise.
  • the magnetic field is oriented in the air gap 47, the upper outer half-surface 40 of the annular bonded magnet 24 towards the upper cylindrical inner half-surface 44 of the metal tubular member 26. It is then guided axially in the tubular metal member 26 towards the lower cylindrical inner half-surface 46 and traverses in the opposite direction the gap 47 to the outer cylindrical lower half-surface 42 to join the annular connected magnet 24.
  • Figure 2B shows in Figure 2B in correspondence, the variations of the magnetic field in the gap 47 which is reversed in the lower part relative to the upper part, as just explained above.
  • the linearity of the magnetic field that can be used in the air gap 47 is no longer linked to external elements but to the only metal tubular member 46. In this way, the sound quality of a loudspeaker produced with the magnetic motor device object of the invention is increased.
  • the geometry of the metal tubular member 46 can be perfectly determined, and in particular its thickness, depending on the maximum field density of the material used, 1, 5 T in the iron.
  • tubular element 22 having the two windings 32, 34 is fully adjusted in the magnetic field which allows to achieve high linearity and further improve the sound quality restored.
  • the metal tubular member 26 is located around the tubular element 22, while the annular bonded magnet 24 is located inside it. In this way, and insofar as the space around the metal tubular member 26 is relatively free, the heat dissipation is great. In this way, the plastic elements used, in particular to guide the tubular element 22, are preserved from heat.
  • the metal tubular member 26 and the annular bonded magnet 24 in another reverse configuration are permuted.
  • the metal tubular member 26 discharges thermal energy axially.
  • the opposite surface 38 of the annular connected magnet 24 has a truncation then forming a truncated cylindrical surface. 54 parallel and coaxial with the magnetic cylindrical surface 36. In this way, the annular magnet 24 is lightened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

The invention relates to a magnetic motor device of an electrodynamic transducer, which includes a bonded annular magnet (24) as well as a tubular element (22) which is mounted coaxially relative to said bonded annular magnet, said bonded annular magnet (24) having a magnetic cylindrical surface (36), while said tubular element (22) comprises a winding (32, 34) extending opposite said magnetic cylindrical surface (36), said tubular element (22) being intended for being driven axially relative to said bonded angular magnet (24) when electric power is supplied to said winding. According to the invention, the device also includes a metal tubular member (26) having a metal cylindrical surface (44, 46), and said metal tubular member (26) is mounted coaxially relative to said tubular element (22) such that said metal cylindrical surface (44, 46) extends opposite said magnetic cylindrical surface (36) relative to said winding (32, 34).

Description

Dispositif de moteur magnétique de transducteur électrodynamique  Electrodynamic transducer magnetic motor device
La présente invention se rapporte à un dispositif de moteur magnétique de transducteur électrodynamique comprenant un aimant lié annulaire et un élément tubulaire supportant un bobinage monté mobile en translation coaxialement par rapport à l'aimant lié annulaire. The present invention relates to an electrodynamic transducer magnetic motor device comprising an annular connected magnet and a tubular element supporting a coil mounted to move in translation coaxially with respect to the annular bonded magnet.
Un tel dispositif est notamment, mais non exclusivement, destiné à rentrer dans la composition des haut-parleurs électrodynamiques.  Such a device is particularly, but not exclusively, intended to enter the composition of the electrodynamic speakers.
Des dispositifs de moteur magnétique connus comportent d'une part des éléments fixes, un aimant permanent annulaire, deux couronnes métalliques contenant du fer prenant coaxialement en sandwich l'aimant permanent en formant des plaques de champ, et un noyau contenant également du fer monté coaxialement au centre de l'aimant permanent, et d'autre part des éléments mobiles, un support cylindrique bobiné maintenu coaxialement dans l'entrefer entre l'aimant et le noyau est une membrane reliée au support cylindrique bobiné. Le support cylindrique bobiné est par exemple réalisé en carton et il comporte des enroulements de fils, par exemple en cuivre, et l'alimentation en courant électrique de ces fils provoque le mouvement axial du support bobiné dans l'entrefer et par conséquent, les mouvements de la membrane. Ce sont ces mouvements de la membrane qui provoquent alors la vibration de l'air et génèrent le son.  Known magnetic motor devices comprise on the one hand fixed elements, an annular permanent magnet, two metal rings containing iron coaxially sandwiching the permanent magnet forming field plates, and a core also containing coaxially mounted iron. in the center of the permanent magnet, and secondly movable elements, a coiled cylindrical support coaxially held in the air gap between the magnet and the core is a membrane connected to the wound cylindrical support. The cylindrical wound support is for example made of cardboard and it comprises windings son, for example copper, and the power supply of these son causes the axial movement of the wound support in the air gap and therefore the movements of the membrane. It is these movements of the membrane that then cause the vibration of the air and generate the sound.
Aussi, de nombreux éléments de ces dispositifs destinés à guider les lignes de champ de l'aimant contiennent du fer, ce qui engendre un certain nombre de non-linéarités nuisibles à la qualité et à la fidélité de restitution sonore du transducteur.  Also, many elements of these devices for guiding the field lines of the magnet contain iron, which generates a number of non-linearities detrimental to the quality and fidelity of sound reproduction of the transducer.
Par conséquent, il a été imaginé des dispositifs tout aimant, ne comprenant pas de fer. Or, les aimants frittés traditionnels sont relativement complexes à former et à adapter selon des géométries particulières.  Therefore, all-magnet devices, not including iron, have been devised. However, traditional sintered magnets are relatively complex to form and adapt according to particular geometries.
Aussi, il a été imaginé des aimants liés, plasto-aimants ou élasto-aimants, pouvant être conformés à loisir. Ils sont en effet réalisés par injection dans un moule, lequel peut présenter une très grande variété de formes. Cela permet de créer des éléments dont le champ magnétique utile est amélioré et par conséquent de limiter le champ de fuite qui est un défaut principal des aimants frittés classiques. Also, it was imagined bound magnets, plasto-magnets or elasto-magnets, which can be shaped at leisure. They are indeed made by injection into a mold, which can have a wide variety of shapes. This makes it possible to create elements whose useful magnetic field is improved and by therefore limit the leakage field which is a main defect of conventional sintered magnets.
Ainsi, l'objet du document EP 2 1 14 086 est un dispositif de moteur magnétique, dépourvu de plaques de champ, mais dont l'aimant permanent est un aimant lié annulaire, d'une forme particulière présentant une surface cylindrique et à l'opposé une surface convexe. Ce document divulgue notamment un dispositif magnétique dont l'aimant lié est installé à l'intérieur du support bobiné, l'aimant lié présentant une surface cylindrique externe qui s'étend en regard des enroulements de fils et une surface convexe qui s'étend vers l'intérieur de l'aimant. Cette surface convexe est telle que la trace d'un plan axial de l'aimant lié et de la surface convexe est une hémi-ellipse. En outre, la surface cylindrique externe présente deux parties cylindriques opposées l'une de l'autre par rapport au plan médian de l'aimant.  Thus, the subject of EP 2 1 14 086 is a magnetic motor device, without field plates, but whose permanent magnet is an annular bonded magnet, of a particular shape having a cylindrical surface and to opposite a convex surface. This document notably discloses a magnetic device whose bonded magnet is installed inside the wound support, the bonded magnet having an outer cylindrical surface which extends opposite the windings of wires and a convex surface which extends towards inside the magnet. This convex surface is such that the trace of an axial plane of the bonded magnet and the convex surface is a hemi-ellipse. In addition, the outer cylindrical surface has two cylindrical portions opposite to each other with respect to the median plane of the magnet.
De la sorte, selon un plan axial, les lignes de champ s'étendent, d'une partie vers l'autre à l'intérieur de l'aimant parallèlement à la courbure définie pa r l a s u rface con vexe h ém i-elliptique et en coupant sensiblement perpendiculairement la surface cylindrique. Cela permet de concentrer efficacement le champ magnétique vers les enroulements de fils du support bobiné.  In this way, along an axial plane, the field lines extend, from one part to the other inside the magnet parallel to the curvature defined by the surface of the emi-elliptical cone and in cutting substantially perpendicularly the cylindrical surface. This effectively concentrates the magnetic field to the wire windings of the wound support.
Cependant, les lignes de champ ne se referment pas aisément au-delà du support bobiné à l'opposé de l'aimant. Aussi, le document EP 2 1 14 086 divulgue la mise en œuvre d'un aimant lié autour du support bobiné et symétrique de celui qui est logé à l'intérieur de manière à refermer les lignes de champ pour obtenir une meilleure linéarité du champ magnétique et limiter les fuites magnétiques.  However, the field lines do not close easily beyond the coiled carrier opposite the magnet. Also, the document EP 2 1 14 086 discloses the implementation of a magnet connected around the wound and symmetrical support of that which is housed inside so as to close the field lines to obtain a better linearity of the magnetic field. and limit magnetic leakage.
Toutefois, la mise en œuvre d'un aimant supplémentaire autour du support bobiné augmente le poids et le volume du dispositif de moteur magnétique. En outre, les aimants liés, plasto-aimants ou élasto-aimants, sont peu conducteurs de l'énergie thermique et par conséquent, l'énergie thermique générée dans le bobinage, où la température peut atteindre 170° C, est très difficilement dissipée. Aussi, un problème qui se pose et que vise à résoudre la présente invention est de fournir un dispositif de moteur magnétique qui permette non seulement de limiter le champ de fuite magnétique mais aussi l'accumulation d'énergie thermique. However, the implementation of an additional magnet around the wound support increases the weight and the volume of the magnetic motor device. In addition, the bonded magnets, plasto-magnets or elasto-magnets, are low conductors of thermal energy and therefore, the thermal energy generated in the coil, where the temperature can reach 170 ° C, is very difficult to dissipate. Also, a problem that arises and that aims to solve the present invention is to provide a magnetic motor device that not only allows to limit the magnetic leakage field but also the accumulation of thermal energy.
Dans ce but, la présente invention propose un dispositif de moteur magnétique de transducteur électrodynamique comprenant, d'une part un aimant lié annulaire générant un champ magnétique, et d'autre part un élément tubulaire monté coaxialement par rapport audit aimant lié annulaire, ledit aimant lié annulaire présentant une surface cylindrique magnétique, tandis que ledit élément tubulaire comporte un bobinage s'étendant en regard de ladite surface cylindrique magnétique, ledit élément tubulaire étant destiné à être entraîné axialement par rapport audit aimant lié annulaire lorsque ledit bobinage est alimenté en courant électrique. Selon l'invention, le dispositif comprend en outre un organe tubulaire métallique présentant une surface cylindrique métallique, et ledit organe tubulaire métallique est monté coaxialement par rapport audit élément tubulaire de façon que ladite surface cylindrique métallique s'étende à l'opposé de ladite surface cylindrique magnétique par rapport audit bobinage de manière à fermer ledit champ magnétique.  For this purpose, the present invention provides an electrodynamic transducer magnetic motor device comprising, on the one hand, an annular connected magnet generating a magnetic field, and on the other hand a tubular element mounted coaxially with said annular bonded magnet, said magnet annular bond having a magnetic cylindrical surface, while said tubular element comprises a coil extending facing said magnetic cylindrical surface, said tubular element being intended to be driven axially with respect to said annular bonded magnet when said winding is supplied with electric current . According to the invention, the device further comprises a metal tubular member having a cylindrical metal surface, and said metal tubular member is mounted coaxially with said tubular member so that said cylindrical metal surface extends opposite said surface cylindrical magnetic with respect to said winding so as to close said magnetic field.
Ainsi, une caractéristique de l'invention réside dans la mise en œuvre de l'organe tubulaire métallique à l'opposé de l'aimant lié annulaire par rapport à l'élément tubulaire bobiné, de manière à fermer le champ magnétique. De la sorte, le champ de fuite est très fortement limité en comparaison des structures classiques et le champ magnétique est concentré à travers l'élément tubulaire bobiné.  Thus, a feature of the invention lies in the implementation of the tubular metal member opposite the annular bonded magnet relative to the wound tubular member, so as to close the magnetic field. In this way, the leakage field is very limited in comparison with conventional structures and the magnetic field is concentrated through the coiled tubular element.
Au surplus, l'énergie thermique générée dans le bobinage se dissipe aisément à travers l'organe tubulaire métallique, qui par nature est un bon conducteur thermique. Selon l'art antérieur, en l'absence d'organe tubulaire métallique, il est nécessaire d'incorporer dans l'aimant lié annulaire, des matériaux coûteux permettant cette dissipation thermique. Outre la dissipation thermique, l'organe tubulaire métallique, par exemple réalisé dans un alliage de fer, permet d'améliorer les tolérances dimensionnelles de fabrication. In addition, the thermal energy generated in the coil easily dissipates through the tubular metal member, which by nature is a good thermal conductor. According to the prior art, in the absence of metal tubular member, it is necessary to incorporate in the annular bonded magnet, expensive materials for this heat dissipation. In addition to the heat dissipation, the tubular metal member, for example made of an iron alloy, makes it possible to improve the dimensional tolerances of manufacture.
Par ailleurs, ledit aimant lié annulaire, qui est bien évidemment un solide plein, présente avantageusement une surface opposée à ladite surface cylindrique magnétique, dont l'intersection avec un plan axial dudit aimant lié annulaire est une hémi-ellipse. Une hémi-ellipse est une courbe définie par une ellipse coupée selon l'un de ces deux axes, soit selon son petit axe qui s'étend entre ses deux centres, soit selon son grand axe qui coupe précisément les deux centres. De la sorte, les lignes de champ magnétique s'étendent, selon un plan axial, d'une partie cylindrique située d'un côté du plan médian de l'aimant lié annulaire vers l'autre, à travers l'aimant en épousant la courbure définie par la surface opposée hémi-elliptique et en coupant sensiblement perpendiculairement la surface cylindrique de l'aimant. Elles traversent ainsi radialement l'élément tubulaire bobiné, puis rejoignent radialement également l'organe tubulaire métallique pour ensuite s'infléchir et s'étendre à travers selon une direction axiale comme on l'expliquera plus en détail dans la suite de la description.  Moreover, said annular bonded magnet, which is obviously a solid solid, advantageously has a surface opposite to said magnetic cylindrical surface, the intersection of which with an axial plane of said annular bonded magnet is a half-ellipse. A hemi-ellipse is a curve defined by an ellipse cut along one of these two axes, either along its minor axis that extends between its two centers, or along its major axis that precisely intersects the two centers. In this way, the magnetic field lines extend, in an axial plane, a cylindrical portion located on one side of the median plane of the annular bonded magnet towards the other, through the magnet while marrying the curvature defined by the opposite hemi-elliptical surface and substantially perpendicularly cutting the cylindrical surface of the magnet. They thus pass radially through the coiled tubular element, then radially join the metal tubular member and then flex and extend therethrough in an axial direction as will be explained in more detail in the following description.
Selon une variante de réalisation, visant essentiellement à réduire le poids et/ou le volume du dispositif de moteur magnétique, ladite surface opposée présente une troncature formant une surface cylindrique tronquée sensiblement parallèle à ladite surface cylindrique magnétique.  According to an alternative embodiment, aimed essentially at reducing the weight and / or the volume of the magnetic motor device, said opposite surface has a truncation forming a truncated cylindrical surface substantially parallel to said magnetic cylindrical surface.
Préférentiellement, ladite surface cylindrique magnétique dudit aimant lié annulaire présente deux premières demi-surfaces cylindriques, tandis que ledit aimant lié annulaire génère un champ magnétique B, et le rapport de la première demi-surface cylindrique et de la section droite de l'organe tubulaire métallique facteur dudit champ magnétique B, est inférieur à la valeur du seuil de saturation magnétique du matériau dudit organe tubulaire métallique. La section droite de l'organe tubulaire correspond à la surface de cette section droite et par conséquent à la différence des surfaces de rayon externe et de rayon interne de l'organe tubulaire. Ainsi, on détermine aisément l'épaisseur requise de l'organe tubulaire métallique, et notamment on évite de mettre en œuvre un organe tubulaire trop volumineux et pesant. Ainsi, par exemple, le rapport de la première demi-surface cylindrique et de la section droite de l'organe tubulaire métallique facteur dudit champ magnétique B, est inférieur à 1 ,5 lorsque ledit organe tubulaire métallique est réalisé en fer. Preferably, said magnetic cylindrical surface of said annular bonded magnet has two cylindrical first half-surfaces, while said annular bonded magnet generates a magnetic field B, and the ratio of the first cylindrical half-surface and the straight section of the tubular member. metallic factor of said magnetic field B, is smaller than the value of the magnetic saturation threshold of the material of said metal tubular member. The cross section of the tubular member corresponds to the surface of this cross section and therefore unlike the outer radius and inner radius surfaces of the tubular member. Thus, the required thickness of the metal tubular member is easily determined, and in particular it is avoided to a tubular organ is too bulky and heavy. Thus, for example, the ratio of the first cylindrical half-surface and the cross section of the metal tubular member factor of said magnetic field B is less than 1.5 when said metal tubular member is made of iron.
Selon un mode de mise en œuvre de l'invention particulièrement avantageux, ladite surface cylindrique métallique présente deux secondes demi-surfaces cylindriques situées dans le prolongement axiale l'une de l'autre et divisées également par un plan médian de l'organe tubulaire, tandis que ledit bobinage est divisé en deux enroulements espacés axialement l'un de l'autre et aptes à venir s'étendre respectivement en regard desdites secondes demi-surfaces cylindriques. Les deux enroulements espacés axialement l'un de l'autre sont constitués d'un seul fil, mais enroulé en sens inverse. Ainsi, lorsque le courant d'alimentation est délivré au fil, il circule dans deux sens opposés entre les deux enroulements. Les deux enroulements sont alors respectivement ajustés au droit des deux parties opposées de l'aimant lié annulaire, de sorte que les deux faisceaux de lignes de champ traversant les deux enroulements sont orientées dans les directions opposées l'une de l'autre. Aussi, les efforts qui s'exercent sur l'élément tubulaire bobiné sont doubles, ce qui accroît la puissance du dispositif de moteur.  According to a particularly advantageous embodiment of the invention, said cylindrical metal surface has two cylindrical second half-surfaces located in the axial extension of one another and also divided by a median plane of the tubular member, while said winding is divided into two windings axially spaced from each other and able to extend respectively opposite said second cylindrical half-surfaces. The two windings spaced axially from each other consist of a single wire, but wound in the opposite direction. Thus, when the supply current is delivered to the wire, it flows in two opposite directions between the two windings. The two windings are then respectively adjusted to the right of the two opposite parts of the annular bonded magnet, so that the two bundles of field lines passing through the two windings are oriented in the opposite directions from one another. Also, the forces exerted on the coiled tubular element are double, which increases the power of the motor device.
Par ailleurs, selon une première variante de réalisation ledit aimant lié annulaire est monté à l'intérieur dudit élément tubulaire, tandis que ledit organe tubulaire métallique s'étend autour dudit élément tubulaire. Ainsi, l'énergie thermique générée dans les enroulements peut se dissiper à travers l'organe tubulaire métallique et radialement vers l'extérieur du dispositif moteur, lorsque l'espace est libre autour de lui. Selon une autre variante, permettant d'évacuer l'énergie thermique axialement vers l'arrière du dispositif moteur, ledit organe tubulaire métallique est monté à l'intérieur dudit élément tubulaire, tandis que ledit aimant lié annulaire s'étend autour dudit élément tubulaire.  Furthermore, according to a first embodiment of said annular bonded magnet is mounted within said tubular member, while said metal tubular member extends around said tubular member. Thus, the thermal energy generated in the windings can dissipate through the metal tubular member and radially outwardly of the motor device, when space is free around it. According to another variant, for discharging thermal energy axially towards the rear of the motor device, said metal tubular member is mounted inside said tubular element, while said annular bonded magnet extends around said tubular element.
D'autres particularités et avantages de l'invention ressortiront à la lecture de la description faite ci-après d'un mode de réalisation particulier de l'invention, donné à titre indicatif mais non limitatif, en référence aux dessins annexés sur lesquels : - la Figure 1 est une vue schématique en coupe axiale d'un dispositif de moteur magnétique selon l'invention conformément à une variante de réalisation ; Other features and advantages of the invention will emerge on reading the following description of a particular embodiment of the invention, given by way of indication but not limitation, with reference to the accompanying drawings in which: - Figure 1 is a schematic axial sectional view of a magnetic motor device according to the invention according to an alternative embodiment;
- la Figure 2A est une vue schématique partielle en coupe axiale de détail de la figure 1 ;  - Figure 2A is a partial schematic view in axial section of detail of Figure 1;
- la Figure 2B est un graphique en correspondance de la figure 2A représentant l'intensité du champ magnétique local ; et,  Figure 2B is a corresponding graph of Figure 2A showing the intensity of the local magnetic field; and,
- la Figure 3 est une vue schématique analogue à la figure 2A illustrant les références dimensionnelles.  - Figure 3 is a schematic view similar to Figure 2A illustrating the dimensional references.
La Figure 1 illustre une variante de réalisation d'un dispositif de moteur magnétique de transducteur électrodynamique 10. Il comprend une partie de réception 12 reliée à une embase 14. La partie de réception 12 comporte une partie tronconique 16 solidaire d'une partie tubulaire à base circulaire 18. La partie tronconique 16 supporte une membrane 20, tandis que la partie tubulaire 1 8 inclut coaxialement selon l'axe du dispositif Z, un élément tubulaire 22 formant support et solidaire de la membrane 20, un aimant lié annulaire 24 situé à l'intérieur de l'élément tubulaire 22 et un organe tubulaire métallique 26 entourant l'élément tubulaire 22. L'élément tubulaire 22 est réalisé en carton, en aluminium, en polyimide ou en fibres de verre ou bien dans un matériau composite. Au surplus, l'élément tubulaire 22 présente une première bordure cylindrique 28 d'élément tubulaire près du rattachement à la membrane 20 et une seconde bordure cylindrique 30 d'élément tubulaire écartée du rattachement à la membrane 20. En outre, il comprend un premier enroulement 32 d'un fil conducteur en cuivre, en aluminium ou tout autre alliage de ces matériaux, voire dans certains cas en argent, situé près de la première bordure cylindrique 28 d'élément tubulaire et un second enroulement 34 dudit fil conducteur en sens inverse situé près de la seconde bordure cylindrique 30 d'élément tubulaire. Bien évidement, les deux enroulements 32, 34 sont reliés par le même fil conducteur.  FIG. 1 illustrates an alternative embodiment of an electrodynamic transducer magnetic motor device 10. It comprises a receiving part 12 connected to a base 14. The receiving part 12 comprises a frustoconical part 16 integral with a tubular part to circular base 18. The frustoconical portion 16 supports a membrane 20, while the tubular portion 1 8 includes coaxially along the axis of the device Z, a tubular member 22 forming a support and secured to the membrane 20, an annular bonded magnet 24 located at the inside of the tubular element 22 and a metal tubular member 26 surrounding the tubular element 22. The tubular element 22 is made of cardboard, aluminum, polyimide or glass fibers or in a composite material. In addition, the tubular element 22 has a first cylindrical rim 28 of tubular element near the attachment to the membrane 20 and a second cylindrical rim 30 of tubular element spaced from the attachment to the membrane 20. In addition, it comprises a first winding 32 of a conductive wire of copper, aluminum or any other alloy of these materials, or in some cases silver, located near the first cylindrical rim 28 of tubular element and a second winding 34 of said conductive wire in the opposite direction located near the second cylindrical rim 30 of tubular element. Of course, the two windings 32, 34 are connected by the same conductive wire.
Dans la partie tubulaire 18 et à l'intérieur de l'élément tubulaire 22 s'étend l'aimant lié annulaire 24. Il présente une surface cylindrique magnétique 36 externe qui s'étend en regard et à distance de l'élément tubulaire 22, et à l'opposé, vers l'intérieur, une surface opposée 38 présentant, dans le plan de la figure correspondant à un plan axial de l'aimant lié annulaire 24, un contour en forme de demi-ellipse. L'aimant lié annulaire 24 présente un premier plan médian PMi perpendiculaire à l'axe Z du dispositif. Aussi, l'aimant lié annulaire 24, dans sa surface cylindrique magnétique 36 externe, présente dans sa partie supérieure, au-dessus du plan médian PMi , une demi-surface supérieure cylindrique 40 externe s'étendant en regard du premier enroulement 32 de fil conducteur et dans sa partie inférieure, au-dessous du plan médian PMi , une demi-surface inférieure cylindrique 42 externe, s'étendant en regard du second enroulement 34 de fil conducteur. In the tubular part 18 and inside the tubular element 22 extends the annular connected magnet 24. It has an outer cylindrical magnetic surface 36 which extends opposite and at a distance from the tubular element 22, and the opposite, inwardly, an opposite surface 38 having, in the plane of the figure corresponding to an axial plane of the annular bonded magnet 24, a contour in the form of a half-ellipse. The annular bonded magnet 24 has a first median plane P M i perpendicular to the Z axis of the device. Also, the annular bonded magnet 24, in its outer cylindrical magnetic surface 36, has in its upper portion, above the median plane P M i, an outer cylindrical upper half-surface 40 extending facing the first winding 32 of conducting wire and in its lower part, below the median plane P M i, a cylindrical outer half-surface 42 extending opposite the second winding 34 of conductive wire.
Bien évidemment, l'aimant lié annulaire 24 est maintenu en position fixe par rapport à la partie tubulaire 18, par exemple par l'intermédiaire de l'embase 14.  Of course, the annular connected magnet 24 is held in a fixed position with respect to the tubular portion 18, for example via the base 14.
L'organe tubulaire métallique 26, par exemple à base de fer, est également maintenu en position fixe à l'intérieur de la partie tubulaire 18 et il s'étend coaxialement autour et à distance de l'élément tubulaire 22. Il présente un second plan médian PM2 confondu, sur la Figure 1 , avec le premier plan médian PMi de l'aimant lié annulaire 24. Ainsi qu'on l'expliquera plus en détail ci-après, l'élément tubulaire 22 est libre par rapport à l'aimant lié annulaire 24 et à l'organe tubulaire métallique 26, et il est mobile axialement par rapport à ces derniers. The metal tubular member 26, for example made of iron, is also held in a fixed position inside the tubular part 18 and it extends coaxially around and at a distance from the tubular element 22. It presents a second median plane P M2 coincides, in Figure 1, with the first median plane P M i of the annular bonded magnet 24. As will be explained in more detail below, the tubular element 22 is free compared to the annular bonded magnet 24 and the metal tubular member 26, and is axially movable relative thereto.
L'organe tubulaire métallique 26 présente une surface interne cylindrique 45 divisée en deux demi-surfaces internes cylindriques opposées l'une de l'autre par rapport au second plan médian PM2, une dem i-surface interne cylindrique supérieure 44 qui s'étend en regard du premier enroulement 32 de fil conducteur, et à l'opposé par rapport au second plan médian PM2 une demi- surface interne cylindrique inférieure 46 qui s'étend en regard du second enroulement 34 de fil conducteur. The tubular metal member 26 has a cylindrical inner surface 45 divided into two cylindrical inner half-surfaces opposite one another with respect to the second median plane P M2 , an upper half-inner cylindrical surface 44 which extends facing the first winding 32 of conductive wire, and opposite to the second median plane P M2 a lower cylindrical inner surface 46 which extends opposite the second winding 34 of conductive wire.
Ainsi, l'élément tubulaire 22 bobiné est installé l ibrement dans une chambre annulaire 47, ou entrefer, qu i s'étend entre l'organe tu bulaire métallique 26 et l'aimant lié annulaire 24. Il est mobile axialement autour d'une position de repos de manière à pouvoir entraîner la membrane 20. On se reportera sur la figure 3 pour définir les dimensions et les positions relatives de l'aimant lié annulaire 24 et de l'organe tubulaire métallique 26. La figure 3 est une vue de détail présentant une hémisection de l'aimant lié annulaire 24 et de l'organe tubulaire métallique 26. Thus, the coiled tubular element 22 is installed optimally in an annular chamber 47, or air gap, which extends between the metal bung member 26 and the annular bonded magnet 24. It is axially movable about a rest position so as to drive the diaphragm 20. Reference is made to FIG. 3 to define the relative dimensions and positions of the annular bound magnet 24 and the metal tubular member 26. FIG. 3 is a detailed view showing a hemisection of the annular bound magnet 24 and of the tubular metal member 26.
Ainsi, l'aimant lié annulaire 24 présente un rayon R et une hauteur H à partir du plan médian PMi et correspondant à la hauteur de la demi-surface supérieure cylindrique 40 externe, tandis que l'organe tubulaire métallique 26 présente une épaisseur E et un rayon intérieur R2. Cette épaisseur E est déterminée par rapport à la densité de champ maximal avant saturation du matériau, et en l'espèce du fer. Ainsi, le ratio entre la demi-surface cylindrique externe de l'aimant lié annulaire 24, dans l'entrefer 47, et la section droite de l'organe tubulaire métallique 26 selon le second plan médian PM2, facteur du champ magnétique conféré par l'aimant lié annulaire 24, doit être inférieur à la valeur du seuil de saturation magnétique du matériau utilisé, par exemple 1 ,5 pour le fer. Thus, the annular bonded magnet 24 has a radius R and a height H from the median plane P M i and corresponding to the height of the outer cylindrical upper half-surface 40, whereas the metallic tubular member 26 has a thickness E and an inner radius R2. This thickness E is determined with respect to the maximum field density before saturation of the material, and in this case iron. Thus, the ratio between the outer cylindrical half-surface of the annular connected magnet 24, in the air gap 47, and the cross-section of the metallic tubular member 26 along the second median plane P M 2, a factor of the magnetic field conferred by the annular bonded magnet 24, must be less than the value of the magnetic saturation threshold of the material used, for example 1, 5 for the iron.
Aussi, en choisissant pour l'aimant lié annulaire 24, un rayon R de 10 mm, une hauteur H de 6 mm, correspondant à une demi-hauteur totale de l'aimant lié annulaire 24, pour un champ magnétique de 0,4 T (Tesla) conféré par une charge au Néodyme de l'aimant lié annulaire et pour l'organe tubulaire métallique 26, un rayon intérieur R2 de 1 1 mm définissant alors un entrefer 47 de 1 mm, et une épaisseur de l'organe tubulaire métallique 26 E de 2 mm, on obtient une densité de champ dans l'organe tubulaire métallique 26 voisine de 1 ,0 T. Cette valeur est inférieure à 1 ,5 T.  Also, by choosing for the annular connected magnet 24, a radius R of 10 mm, a height H of 6 mm, corresponding to a total half-height of the annular bonded magnet 24, for a magnetic field of 0.4 T (Tesla) conferred by a neodymium charge of the annular bonded magnet and for the metal tubular member 26, an inner radius R2 of 1 1 mm defining an air gap 47 of 1 mm, and a thickness of the metallic tubular member 26 E of 2 mm, a field density is obtained in the tubular metal member 26 close to 1.0 T. This value is less than 1.5 T.
On se reportera à présent sur la figure 2A montrant les lignes de champ magnétique 48 qui s'étendent entre l'aimant lié annulaire 24 et l'organe tubulaire métallique 26 et pour décrire les avantages du dispositif de moteur magnétique selon l'invention. On retrouve également sur cette figure 2A partiellement, l'élément tubulaire 22 muni de ses deux enroulements, le premier 32, et le second 34.  Reference will now be made to FIG. 2A showing the magnetic field lines 48 which extend between the annular bonded magnet 24 and the metal tubular member 26 and to describe the advantages of the magnetic motor device according to the invention. Also in this Figure 2A partially, the tubular element 22 provided with its two windings, the first 32, and the second 34.
Ainsi, les lignes de champ magnétique 48 courbées s'étendent à l'intérieur de l'aimant lié annulaire 24, selon une section axiale, sensiblement parallèlement à la surface opposée 38 de la surface cylindrique magnétique 36 externe, pour déboucher respectivement perpendiculairement dans les deux demi-surfaces 40, 42. Ces lignes de champ magnétique 48 sont ici, sur la figure 2A, orientées dans le sens des aiguilles d'une montre. Aussi, le champ magnétique est orienté dans l'entrefer 47, de la demi-surface supérieure externe 40 de l'aimant lié annulaire 24 vers la demi-surface interne cylindrique supérieure 44 de l'organe tubulaire métallique 26. Il est ensuite guidé axialement dans l'organe tubulaire métallique 26 vers la demi-surface interne cylindrique inférieure 46 et traverse en sens inverse l'entrefer 47 vers la demi- surface inférieur cylindrique externe 42 pour rejoindre l'aimant lié annulaire 24. On a représenté sur la figure 2B en correspondance, les variations du champ magnétique dans l'entrefer 47 lequel s'inverse dans la partie inférieure par rapport à la partie supérieure, comme on vient de l'expliquer ci-dessus. Thus, the curved magnetic field lines 48 extend inside the annular connected magnet 24, in an axial section, substantially parallel to the opposite surface 38 of the magnetic cylindrical surface 36 external, to respectively open perpendicularly in the two half-surfaces 40, 42. These magnetic field lines 48 are here, in Figure 2A, oriented in the direction of clockwise. Also, the magnetic field is oriented in the air gap 47, the upper outer half-surface 40 of the annular bonded magnet 24 towards the upper cylindrical inner half-surface 44 of the metal tubular member 26. It is then guided axially in the tubular metal member 26 towards the lower cylindrical inner half-surface 46 and traverses in the opposite direction the gap 47 to the outer cylindrical lower half-surface 42 to join the annular connected magnet 24. There is shown in Figure 2B in correspondence, the variations of the magnetic field in the gap 47 which is reversed in the lower part relative to the upper part, as just explained above.
Ainsi, la linéarité du champ magnétique utilisable dans l'entrefer 47 n'est plus liée à des éléments extérieurs mais au seul organe tubulaire métallique 46. De la sorte, la qualité sonore d'un haut-parleur réalisé avec le dispositif de moteur magnétique objet de l'invention est augmentée. En outre, et ainsi qu'on l'a expliqué ci-dessus, la géométrie de l'organe tubulaire métallique 46 peut être parfaitement déterminée, et notamment son épaisseur, en fonction de la densité de champ maximal du matériau utilisé, soit 1 ,5 T dans le fer.  Thus, the linearity of the magnetic field that can be used in the air gap 47 is no longer linked to external elements but to the only metal tubular member 46. In this way, the sound quality of a loudspeaker produced with the magnetic motor device object of the invention is increased. In addition, and as explained above, the geometry of the metal tubular member 46 can be perfectly determined, and in particular its thickness, depending on the maximum field density of the material used, 1, 5 T in the iron.
En outre, l'élément tubulaire 22 présentant les deux enroulements 32, 34 est entièrement ajusté dans le champ magnétique ce qui permet d'atteindre des linéarités élevées et d'améliorer plus encore la qualité sonore restituée.  In addition, the tubular element 22 having the two windings 32, 34 is fully adjusted in the magnetic field which allows to achieve high linearity and further improve the sound quality restored.
Selon la présente variante de réalisation, l'organe tubulaire métallique 26 est situé autour de l'élément tubulaire 22, tandis que l'aimant lié annulaire 24 est situé lui à l'intérieur. De la sorte, et dans la mesure où l'espace autour de l'organe tubulaire métallique 26 est relativement libre, la dissipation thermique est grande. De la sorte, les éléments en matière plastique utilisés, notamment pour guider l'élément tubulaire 22, sont préservés de la chaleur.  According to the present variant embodiment, the metal tubular member 26 is located around the tubular element 22, while the annular bonded magnet 24 is located inside it. In this way, and insofar as the space around the metal tubular member 26 is relatively free, the heat dissipation is great. In this way, the plastic elements used, in particular to guide the tubular element 22, are preserved from heat.
Toutefois, il est envisagé une autre variante de réalisation ou l'organe tubulaire métallique 26 et l'aimant lié annulaire 24 dans une autre configuration inverse, sont permutés. De la sorte, l'organe tubulaire métallique 26 évacue l'énergie thermique axialement. Selon encore une autre variante de réalisation, illustrée sur la Figure 1 par des traits interrompus 50, 52, parallèles à l'axe du dispositif Z, la surface opposée 38 de l'aimant lié annulaire 24 présente une troncature formant alors une surface cylindrique tronquée 54 parallèle et coaxiale à la surface cylindrique magnétique 36. De la sorte, on allège l'aimant annulaire 24. However, it is contemplated another embodiment or the metal tubular member 26 and the annular bonded magnet 24 in another reverse configuration, are permuted. In this way, the metal tubular member 26 discharges thermal energy axially. According to yet another variant embodiment, illustrated in FIG. 1 by broken lines 50, 52, parallel to the axis of the device Z, the opposite surface 38 of the annular connected magnet 24 has a truncation then forming a truncated cylindrical surface. 54 parallel and coaxial with the magnetic cylindrical surface 36. In this way, the annular magnet 24 is lightened.

Claims

REVENDICATIONS
1 . Dispositif de moteur magnétique de transducteur électrodynamique comprenant, d'une part un aimant lié annulaire (24) générant un champ magnétique, et d'autre part un élément tubulaire (22) monté coaxialement par rapport audit aimant lié annulaire, ledit aimant lié annulaire (24) présentant une surface cylindrique magnétique (36), tandis que ledit élément tubulaire (22) comporte un bobinage (32, 34) s'étendant en regard de ladite surface cylindrique magnétique (36), ledit élément tubulaire (22) étant destiné à être entraîné axialement par rapport audit aimant lié annulaire (24) lorsque ledit bobinage est alimenté en courant électrique ; 1. An electrodynamic transducer magnetic motor device comprising on the one hand an annular bonded magnet (24) generating a magnetic field, and on the other hand a tubular element (22) mounted coaxially with said annular bonded magnet, said annular bonded magnet ( 24) having a magnetic cylindrical surface (36), while said tubular element (22) comprises a coil (32, 34) extending opposite said magnetic cylindrical surface (36), said tubular element (22) being intended for being driven axially with respect to said annular connected magnet (24) when said winding is supplied with electric current;
caractérisé en ce qu'il comprend en outre un organe tubulaire métallique (26) présentant une surface cylindrique métallique (45),  characterized in that it further comprises a metallic tubular member (26) having a cylindrical metal surface (45),
et en ce que ledit organe tubulaire métallique (26) est monté coaxialement par rapport audit élément tubulaire (22) de façon que lad ite surface cylindrique métallique (45), s'étende à l'opposé de ladite surface cylindrique magnétique (36) par rapport audit bobinage (32, 34) de manière à fermer ledit champ magnétique.  and in that said metallic tubular member (26) is coaxially mounted with respect to said tubular member (22) so that said metal cylindrical surface (45) extends away from said magnetic cylindrical surface (36) by said winding (32, 34) to close said magnetic field.
2. Dispositif de moteur magnétique selon la revendication 1 , caractérisé en ce que ledit aimant lié annulaire (24) présente une surface opposée (38) à ladite surface cylindrique magnétique (36) dont l'intersection avec un plan axial dudit aimant lié annulaire (24) est une hémi-ellipse.  Magnetic motor device according to claim 1, characterized in that said annular bonded magnet (24) has an opposite surface (38) to said magnetic cylindrical surface (36) intersecting with an axial plane of said annular bonded magnet ( 24) is a hemi-ellipse.
3. Dispositif de moteur magnétique selon la revendication 2, caractérisé en ce que ladite surface opposée (38) présente une troncature formant une surface cylindrique tronquée (54) sensiblement parallèle à ladite surface cylindrique magnétique (36).  3. Magnetic motor device according to claim 2, characterized in that said opposite surface (38) has a truncation forming a truncated cylindrical surface (54) substantially parallel to said magnetic cylindrical surface (36).
4. Dispositif de moteur magnétique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ladite surface cylindrique magnétique (36) dudit aimant lié annulaire (24) présente deux premières demi- surfaces cylindriques (40, 42), tandis que ledit aimant lié annulaire génère un champ magnétique B, et en ce que le rapport de la première demi-surface cylindrique et de la section droite de l'organe tubulaire métallique (26), facteur dudit champ magnétique B est inférieur à la valeur du seuil de saturation magnétique du matériau dudit organe tubulaire métallique (26). A magnetic motor device according to any one of claims 1 to 3, characterized in that said magnetic cylindrical surface (36) of said annular bonded magnet (24) has two cylindrical first half-surfaces (40, 42), while said annular bonded magnet generates a magnetic field B, and in that the ratio of the first cylindrical half-surface and the straight section of the metallic tubular member (26), factor said magnetic field B is less than the value of the magnetic saturation threshold of the material of said metal tubular member (26).
5. Dispositif de moteur magnétique selon la revendication 4, caractérisé en ce que le rapport de la première demi-surface cylindrique et de la section droite de l'organe tubulaire métallique (26), facteur dudit champ magnétique B, est inférieur à 1 ,5 lorsque ledit organe tubulaire métallique (26) est réalisé en fer.  5. Magnetic motor device according to claim 4, characterized in that the ratio of the first cylindrical half-surface and the cross section of the tubular metal member (26), factor of said magnetic field B, is less than 1, 5 when said tubular metal member (26) is made of iron.
6. Dispositif de moteur magnétique selon l'une quelconque des revendications 1 à 5, caractérisé en ce que ladite surface cylindrique métallique (45) présente deux secondes demi-surfaces cylindriques (44, 46) situées dans le prolongement axiale l'une de l'autre, tandis que ledit bobinage est divisé en deux enroulements (32, 34) espacés axialement l'un de l'autre et aptes à venir s'étendre respectivement en regard desdites secondes demi- surfaces cylindriques (44, 46).  6. Magnetic motor device according to any one of claims 1 to 5, characterized in that said cylindrical metal surface (45) has two cylindrical second half-surfaces (44, 46) located in the axial extension of one of the other, while said winding is divided into two windings (32, 34) axially spaced from each other and able to extend respectively facing said second cylindrical half-surfaces (44, 46).
7. Dispositif de moteur magnétique selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit aimant lié annulaire (24) est monté à l'intérieur dudit élément tubulaire (22), tandis que ledit organe tubulaire métallique (26) s'étend autour dudit élément tubulaire.  7. Magnetic motor device according to any one of claims 1 to 6, characterized in that said annular connected magnet (24) is mounted inside said tubular element (22), while said tubular metal member (26) extends around said tubular element.
8. Dispositif de moteur magnétique selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit organe tubulaire métallique (26) est monté à l'intérieur dudit élément tubulaire (22), tandis que ledit aimant lié annulaire (24) s'étend autour dudit élément tubulaire.  Magnetic motor device according to one of claims 1 to 6, characterized in that said metal tubular member (26) is mounted inside said tubular element (22), whereas said annular connected magnet (24) extends around said tubular element.
EP12707877.2A 2011-02-08 2012-02-07 Magnetic motor device of an electrodynamic transducer Withdrawn EP2673961A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1150993A FR2971385B1 (en) 2011-02-08 2011-02-08 MAGNETIC MOTOR DEVICE OF ELECTRODYNAMIC TRANSDUCER
PCT/FR2012/050262 WO2012107682A1 (en) 2011-02-08 2012-02-07 Magnetic motor device of an electrodynamic transducer

Publications (1)

Publication Number Publication Date
EP2673961A1 true EP2673961A1 (en) 2013-12-18

Family

ID=44209791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12707877.2A Withdrawn EP2673961A1 (en) 2011-02-08 2012-02-07 Magnetic motor device of an electrodynamic transducer

Country Status (5)

Country Link
US (2) US20140339924A1 (en)
EP (1) EP2673961A1 (en)
CN (1) CN103348701A (en)
FR (1) FR2971385B1 (en)
WO (1) WO2012107682A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019120137B3 (en) * 2019-07-25 2020-08-13 Karsten Atmani, bürgerlicher Name Buß Electrodynamic loudspeaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5701040A (en) * 1992-11-03 1997-12-23 British Technology Group Limited Magnet arrangement, and drive device and cooling apparatus incorporating same
US5715324A (en) * 1994-01-05 1998-02-03 Alpine Electronics, Inc. Speaker having magnetic circuit
US20050179326A1 (en) * 2000-10-25 2005-08-18 Harman International Industries Incorporated Electromagnetic motor with flux stabilization ring, saturation tips, and radiator
US20090028375A1 (en) * 2005-11-03 2009-01-29 Universite Du Maine Electrodynamic transducer and use thereof in loudspeakers and geophones

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3574403B2 (en) * 1998-03-19 2004-10-06 ジェイビーエル・インコーポレーテッド Shorting ring for dual coil dual gap speaker drive
JP2007306214A (en) * 2006-05-10 2007-11-22 Fujitsu Ten Ltd Speaker magnetic circuit
CN201134323Y (en) * 2007-08-04 2008-10-15 曹晓洪 Electromagnetic induction controlled direct driving reciprocating type high efficient transducer
EP2114086B1 (en) * 2008-04-30 2012-12-26 Renault S.A.S. Ironless and leakage free coil transducer motor assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5701040A (en) * 1992-11-03 1997-12-23 British Technology Group Limited Magnet arrangement, and drive device and cooling apparatus incorporating same
US5715324A (en) * 1994-01-05 1998-02-03 Alpine Electronics, Inc. Speaker having magnetic circuit
US20050179326A1 (en) * 2000-10-25 2005-08-18 Harman International Industries Incorporated Electromagnetic motor with flux stabilization ring, saturation tips, and radiator
US20090028375A1 (en) * 2005-11-03 2009-01-29 Universite Du Maine Electrodynamic transducer and use thereof in loudspeakers and geophones

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2012107682A1 *

Also Published As

Publication number Publication date
US20140339924A1 (en) 2014-11-20
CN103348701A (en) 2013-10-09
FR2971385A1 (en) 2012-08-10
FR2971385B1 (en) 2014-02-14
WO2012107682A1 (en) 2012-08-16
US20170179807A1 (en) 2017-06-22

Similar Documents

Publication Publication Date Title
EP2577992B1 (en) Acoustic loudspeaker
EP2524519B1 (en) Coaxial speaker system having a compression chamber with a horn
EP3403314A1 (en) Stator for an axial flow machine with a stator ring composed of modules
EP2156538B1 (en) Electromagnetic actuator with variable reluctance
FR2851687A1 (en) Ignition coil for vehicle, has peripheral core forming magnetic circuit with core and surrounding wiring formed by two coil bodies, where peripheral core has cavity in its peripheral extension to receive zone of extremity of core
EP2673961A1 (en) Magnetic motor device of an electrodynamic transducer
WO2012156593A1 (en) Electric current generating turbine
EP1474952B1 (en) Moving-coil electrodynamic motor particularly for a loudspeaker, loudspeaker and corresponding pole piece
EP2524521B1 (en) Dome-shaped electrodynamic transducer having a floating suspension
EP2534851B1 (en) Electrodynamic-transducer magnetic motor
FR3104368A1 (en) LARGE EXCURSION, LOW DISTORTION AND LOW DEPTH LOUDSPEAKER
FR3071678A1 (en) ELECTROMAGNETIC ENERGY CONVERTER
WO2021111010A1 (en) High excursion, low distortion and low depth speaker
FR3133719A1 (en) Coaxial membrane speaker comprising an insulating material, and two conductive blades fixed on or in the membrane
EP4191847A1 (en) Electromagnetic transducer for recovering vibrational energy
FR3078209A1 (en) STARTER COMPRISING AN AXIALLY COMPRESSED BROOM DOOR
WO2011086303A1 (en) Electrodynamic transducer including an acoustic waveguide ensuring heat dissipation
EP1237394A1 (en) Magnetic circuit for electrodynamic loudspeaker
WO2017032930A1 (en) Electrical connector of an electromagnetic actuator for a valve
EP0779698A1 (en) Multipolar dynamoelectric vibration generator
FR3020894A1 (en) SYSTEM OF AT LEAST ONE ELECTRO-MAGNET WITH BUOY EDGES OFF PLANS
WO2014083254A1 (en) Electronic assembly comprising a component having a plurality of heat dissipation surfaces
FR2883122A1 (en) Loudspeaker, has driver with magnetic circuit that interacts with moving coil and comprises upper and lower compensation coils coaxial to moving coil and symmetrically positioned on core on both sides of air gap
FR2899393A1 (en) High voltage central electrode for radiofrequency plasma generation spark plug, has stem connected to plug`s coil, where electrode is made of nickel and coil has one end turn connected to inner end of electrode by connection system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130731

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20170418

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20170829