Three-phase electrical connection system

Abstract

The invention relates to a three-phase electrical connection system, comprising a socket (S), an electrical plug (F), and a magnetic indexing device (1) divided into two parts, a first part (2) being fixed to the socket (S), and a second part (3) being rigidly connected to the plug (F), each of the first part (2) and the second part (3) of the magnetic indexing device comprising: a yoke (20, 30); a first group of three identical permanent magnets (201_1, 201_2, 201_3, 301_1, 301_2, 301_3), each of the three identical permanent magnets of the first group being fixed to a respective annular part of the yoke; the three magnets being spaced apart from each other at a non-zero regular first angular interval (I1); the magnets all having the same magnetic orientation parallel to the axis of rotation, the permanent magnets of the first part being magnetically attracted to the permanent magnets of the second part.

Description

Technical Field

[0001] The present invention relates to a three-phase electrical connection system using magnetic means for allowing a mechanical coupling between two of its parts. Background Art

[0002] As is known, three-phase electrical connection systems generally consist of an electrical socket and a plug intended to be mechanically and electrically coupled to the socket.

[0003] In the three-phase version, both the plug and the socket include three phase electrical terminals, an earth terminal, and usually a neutral terminal.

[0004] The three phase terminals are positioned in a triangle and the ground terminal may be positioned to form a square with the three other terminals. The neutral terminal may be positioned at the center of the square thus formed. In conventional solutions, the user orients the plug relative to the socket to allow a mechanical and therefore electrical connection between the two elements.

[0005] Coupling solutions based on magnetic effects have been proposed in the prior art. These solutions ensure the magnetic attraction of the plug towards the socket to achieve a mechanical bond between the plug and the socket and thus an electrical connection between the electrical terminals present on the plug and the electrical terminals of the socket.

[0006] These known magnetic solutions are suitable for single-phase systems and often allow the plug to be connected to the socket regardless of the orientation of the plug relative to the socket (360° coupling). Such solutions are described in particular in patent applications WO 2012 / 032230 A1, EP 2667459 A1, FR 3012263 A1 and WO 2017 / 001755 A1. They are not suitable for three-phase systems, especially because of volume issues.

[0007] Other electrical connection solutions using magnetic effects are also described in patent applications FR3072216A1, US2011 / 171837A1 and US2019 / 009680A1. The purpose of these solutions is to propose only a single connection angle position and to integrate a mechanical error-proofing device for this purpose.

[0008] The object of the present invention is to propose a three-phase electrical connection system comprising magnetic means designed to ensure mechanical coupling in respective multiple angular positions of the plug relative to the socket, so as to allow a reliable electrical connection between the electrical plug and the socket even without user intervention. The solution of the invention will advantageously operate only by means of magnetic means, i.e. limiting the use of specific mechanical error-proofing means as provided in the prior art. Summary of the invention

[0009] This object is achieved by a three-phase electrical connection system comprising a socket, an electrical plug, and a magnetic indexing device in two parts, wherein a first part is fixed to the socket and a second part is integral with the plug, each of the first and second parts of the magnetic indexing device comprising:

[0010] - an annular yoke made of ferromagnetic material and comprising an axis of revolution and at least one swivel support surface (200, 300) formed in a plane transverse to its axis of revolution, said surface being cut into three respective identical annular parts, the angular extent of each of said three respective identical annular parts being 120°,

[0011] - a first set of three identical permanent magnets, each fixed to a respective annular portion of the yoke,

[0012] - the three magnets are spaced apart from each other at a non-zero regular first angular spacing,

[0013] - The magnets all have the same magnetic orientation parallel to the axis of rotation, the permanent magnets of the first part magnetically attracting the permanent magnets of the second part.

[0014] In the prior art, the literature does not propose a solution aimed at allowing a plurality of separate angular positions in an electrical connection system. Their purpose is often to limit the number of positions to ensure electrical connection between the corresponding terminals of the socket and the plug. In the present invention, all magnets are identical and have the same orientation, which allows three connection angular positions offset by 120°.

[0015] According to a particular feature, the first part of the magnetic indexing device comprises:

[0016] - a second set of three identical other permanent magnets, each permanent magnet of the second set being fixed to a respective annular portion of the supporting surface of the yoke,

[0017] - on the yoke, three permanent magnets of the second group are sandwiched between the two permanent magnets of the first group and spaced at the same second angular interval relative to each of the two permanent magnets of the first group,

[0018] - said permanent magnets of the second set have an opposite magnetic orientation to the magnets of the first set.

[0019] According to another particular feature, the second part of the magnetic indexing device may also include:

[0020] - a second set of three identical other permanent magnets, each permanent magnet of the second set being fixed to a respective annular portion of the supporting surface of the yoke,

[0021] - on the yoke, three permanent magnets of the second group are sandwiched between and spaced relative to the two permanent magnets of the first group,

[0022] - said permanent magnets of the second set have an opposite magnetic orientation to the magnets of the first set.

[0023] According to a particular feature, each permanent magnet of the device has the shape of a ring segment.

[0024] According to a particular embodiment, each permanent magnet of the first set is formed by a ring portion extending over an angular range chosen to be greater than or equal to 40° but strictly less than 120°.

[0025] According to another particular embodiment, it is characterized in that each permanent magnet of the first group is formed by a ring portion extending over an angular range chosen between 55° and 100°.

[0026] According to another particular embodiment, each magnet of the first set is formed by a ring portion extending over an angular range chosen to be between 70° and 90°.

[0027] According to a particular feature of the invention, the plug and the socket comprise respective electrical connection members, respectively provided on the plug and the socket, for mutual connection in three respective angular positions of the plug relative to the socket, the three angular positions being offset by 120° from each other.

[0028] According to a particular feature, the plug comprises three phase electrical terminals forming an equilateral triangle with each other.

[0029] According to another particular feature, the plug comprises a ground terminal arranged at the centre of said triangle.

[0030] According to another particular feature, the plug comprises a neutral electrical terminal.

[0031] According to another particular feature, the socket comprises three phase electrical terminals mutually forming an equilateral triangle identical to that of the plug, arranged so as to allow the plug to be connected to the socket in three angular positions offset by 120° each.

[0032] According to another particular feature, the socket comprises a neutral electrical terminal which is repeated three times and each of which is arranged so as to allow the plug to be connected to the socket in three angular positions offset by 120° each.

[0033] According to another particular feature, the plug carries at least one electrical data transmission terminal and the socket comprises a data transmission terminal repeated three times and each arranged to allow connecting the plug to the socket in three angular positions offset by 120° each. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features and advantages will become apparent from the following description taken in conjunction with the following drawings:

[0035] - Figure 1 The implementation principle of the electrical connection system according to the present invention is schematically shown in a side view;

[0036] - Figure 2 The socket and the plug used in the system of the present invention are shown in front view respectively;

[0037] - Figure 3A and 3B The yokes of the two magnetic parts of the system of the invention are shown in front view;

[0038] - Figures 4A to 4C Three variations of a first configuration of a magnetic indexing device for use in the system of the present invention are shown;

[0039] - Figures 5A to 5C Three variations of the second configuration of the magnetic indexing device used in the system of the present invention are shown;

[0040] - Figures 6A to 6C Three variations of a third configuration of a magnetic indexing device for use in the system of the present invention are shown;

[0041] - Figure 7 A diagram illustrating the dimensional characteristics of the system of the present invention is shown. DETAILED DESCRIPTION

[0042] The three-phase electrical connection system of the invention consists of an electrical plug F intended to be connected to an electrical device APP and an electrical socket S intended to be connected to a power source ALIM, on which the plug F makes an electrical connection. Typically, the socket S is fixed and the plug F moves toward the socket to allow connection.

[0043] The socket S and the plug F advantageously have a cylindrical housing.

[0044] The system of the invention also comprises a magnetic indexing device 1 having two magnetic parts 2, 3, called first part 2 and second part 3. The first part 2 is fixed to the socket S and the second part 3 is integral with the plug F. It will be seen below that the magnetic architecture of the magnetic indexing device is six-pole. Each of the two parts is housed in a corresponding housing of the socket S and the plug F.

[0045] In the solution of the invention, two magnetic parts are used to ensure at least mechanical coupling of the plug F against the socket S. The electrical connection of the terminals of the plug F with the terminals of the socket S can be made simultaneously with the mechanical coupling or at a later stage. In other words, the solution of the invention at least allows the plug to adopt a stable mechanical position relative to the socket so that the plug is electrically connected to the socket while meeting the electrical connection conventions of a three-phase electrical system.

[0046] The magnetic indexing device of the invention is intended to make it possible to arrange the plug F relative to the socket S in three respective angular positions offset by 120° each.

[0047] The electrical connection solution is then suitable for ensuring the electrical connection between the electrical terminals of the plug F and the electrical terminals of the socket, whatever the three angular positions of the plug F relative to the socket S (one of the three angular positions).

[0048] like Figure 2 As shown, certain electrical terminals present on the socket S are repeated three times in order to allow the plug F to be arranged in three separate positions offset by 120°.

[0049] As an example, and not by way of limitation, on the plug F side, we have:

[0050] - three phase electrical terminals L1 , L2 , L3 arranged at the three vertices of an equilateral triangle;

[0051] - a single grounded electrical terminal PE arranged at the centre of said triangle;

[0052] - a single neutral electrical terminal N;

[0053] - possibly two data transmission terminals PP, CP;

[0054] And on the plug S side, we have:

[0055] - three phase electrical terminals L1 ', L2', L3' arranged at the three vertices of an equilateral triangle identical to that of the plug F, to allow connection of the plug F in three angular positions offset by 120°;

[0056] - a single ground electrical terminal PE' arranged at the centre of the triangle formed by the three phase terminals;

[0057] - three neutral electrical terminals N1 ′, N2 ′, N3 ′ mutually forming a second equilateral triangle and each of which is arranged so as to allow connection of a neutral terminal of the plug in each of the three angular orientations of the plug F relative to the socket S;

[0058] - two data transmission terminals which are repeated three times (CP1', CP2', CP3' and PP1', PP2', PP3') and arranged to allow connection of the two data transmission terminals of the plug F in each of the three angular orientations of the plug F relative to the socket S.

[0059] Of course, other configurations are contemplated.The neutral terminal may be arranged centrally and the ground terminal may be repeated on the socket side.

[0060] It is pointed out that in order to avoid connecting the neutral terminal to the phase terminal, the neutral terminal is advantageously offset in a suitable manner relative to the phase terminal to achieve a natural error-proofing mechanism.

[0061] As an example, electrical terminals used in plugs and sockets may be clip terminals or flat contacts.

[0062] The two magnetic parts 2, 3 of the indexing device are intended to attract each other by magnetic attraction effect, for example through a plastic housing.

[0063] Each of the two parts 2, 3 comprises a yoke 20, 30 (hereinafter referred to as yoke) preferably made of ferromagnetic material. The two yokes 20, 30 are advantageously identical in shape and composition (same material). Each yoke 20, 30 is realized in the form of a ring advantageously having a rectangular cross-section. The ring is therefore advantageously flat and thus has two opposite transverse annular faces around its axis of rotation (X). The axis of rotation is parallel to the direction in which the plug F approaches the socket S to achieve the connection. At least one of the two faces is flat and is intended to support the permanent magnet. For each of the yokes 20, 30, it is called a support face 200, 300. As Figure 3A and 3B As shown, the support surface 200, 300 is cut into three adjacent identical annular portions (200_1, 200_2, 200_3 and 300_1, 300_2, 300_3) each extending over an angular range of 120° to occupy the entire circumference of the yoke. For each yoke, the three annular portions are referred to as the first annular portion, the second annular portion and the third annular portion.

[0064] As an example, the yokes 20 , 30 may have a thickness of 2 mm to 8 mm.

[0065] Similarly, the yokes 20 , 30 may have an inner diameter D1 of 40 mm to 120 mm and an outer diameter D2 of 50 mm to 140 mm.

[0066] The following different magnetic configurations can then be distinguished: The first configuration is the lowest configuration, the subsequent configurations are successive improvements.

[0067] First configuration— Figures 4A to 4C

[0068] In this configuration, each yoke 20 , 30 carries a first set of three identical permanent magnets 201_1 , 201_2 , 201_3 , 301_1 , 301_2 , 301_3 .

[0069] The magnets associated with the first portion and the magnets associated with the second portion are advantageously identical in shape and composition.

[0070] For each magnetic part 2,3, a first permanent magnet 201_1,301_1 is fixed to a first annular part 200_1,300_1 of the support surface, a second permanent magnet 201_2,301_2 is fixed to a second annular part 200_2,300_2 of the support surface, and a third permanent magnet 201_3,301_3 is fixed to a third annular part 200_3,300_3 of the support surface.

[0071] On each yoke, the permanent magnets are fixed to their support faces so as to have a magnetic orientation parallel to the axis of rotation (X) of the yoke (by convention, in the north-south direction). The permanent magnets of the first part and the permanent magnets of the second part are oriented to be magnetically attracted. They thus have polar faces in contact with the support. In all the configurations described, each magnet will be fixed by pressing one of its two polar faces (in its magnetic direction) against the support face of the yoke integral with it. In the accompanying drawings, by convention, the magnetic orientation of the permanent magnets is shown with arrows oriented in the north-south direction.

[0072] Each permanent magnet may be formed in the shape of a ring portion having a radius of curvature that is the same as that of the yoke to match the shape of the yoke, and a radial dimension that is constant over its entire angular extent and is the same as that of the yoke.

[0073] On each yoke 20, 30, the permanent magnets are mutually spaced at a non-zero regular spacing l1, l2 (magnets not touching). The angular spacing is defined by the angular extent around the axis of revolution (X) and is the same for both magnetic parts.

[0074] In this first configuration, each magnet can extend over an angular range determined on the annular portion. Since, on each yoke, the magnets do not touch each other, they can be realized over an angular range strictly less than 120° (to maintain a non-zero angular spacing with each of the adjacent magnets) and greater than 40°. They may have to be long enough to ensure a precise magnetic arrangement between the two parts 2, 3.

[0075] By way of example and not limitation, the following different embodiments may be distinguished:

[0076] - On both yokes 20, 30, each of the magnets can extend over the same angular range AP of 100° on their annular portion ( Figure 4A );

[0077] - On both yokes, each of the magnets can extend over the same angular range AP of 80° on their annular portion ( Figure 4B );

[0078] - On both yokes, each of the magnets can extend over the same angular range AP of 55° on their annular portion ( Figure 4C).

[0079] In this configuration, on each magnetic part, the angular spacing l1 , l2 between the two magnets depends of course on the given dimensions of the magnets.

[0080] Second configuration - Figures 5A to 5C

[0081] Compared to the first configuration, this second configuration adds a second set of three identical permanent magnets 202_1, 202_2, 202_3 to only the first part 2 of the magnetic indexing device. The second part 3 remains the same as described above for the first configuration.

[0082] Each of the three magnets 202_1 , 202_2 , 202_3 is fixed to a respective annular portion 200_1 , 200_2 , 200_3 of the yoke on the same face as the three magnets of the first set.

[0083] Each of the three new magnets is sandwiched between the two magnets of the first set, leaving a non-zero regular angular spacing from the two magnets of the first set.

[0084] Each permanent magnet of the second set may be formed by the shape of a ring portion having a radius of curvature identical to that of the yoke to match its shape, and a radial dimension constant over their entire angular range and identical to that of the yoke.

[0085] All three of them are fixed to their supporting surfaces to have the same magnetic orientation, parallel to the axial rotation axis (X) and opposite to that of the magnets of the first set.

[0086] They advantageously have the same thickness (defined in the axial direction) as the thickness of the magnets of the first group of the first portion.

[0087] They extend over the same or smaller angular extent than the magnets of the first set of the first part, the combination of the magnets of the first set, the magnets of the second set and the two angular intervals being non-zero equal to 120°.

[0088] As an example, the following different embodiments can be distinguished:

[0089] - On the first part, each of the permanent magnets 201_1, 201_2, 201_3 of the first group can extend over its annular portion over an angular range AP1 of 100°, and each of the permanent magnets 202_1, 202_2, 202_3 of the second group can extend over an angular range AP2 of 10°

[0090] ( Figure 5AThe regular angular spacing l1 is therefore close to 5° between two adjacent magnets. The second part 3 has only a first group of three permanent magnets 301_1 , 301_2 , 301_3 , which are identical to the first group of permanent magnets of the first part 2 .

[0091] Each of the permanent magnets 201_1, 201_2, 201_3 of the first group may extend over an angular range AP1 of 80° on its annular portion, and the permanent magnets 202_1, 202_2, 202_3 of the second group may extend over an angular range AP1 of 80°.

[0092] 202_3 may extend over an angle range AP2 of 30° ( Figure 5B The regular angular spacing l1 is therefore close to 5° between two adjacent magnets. The second part 3 has only a first group of three permanent magnets 301_1 , 301_2 , 301_3 , which are identical to the first group of permanent magnets of the first part 2 .

[0093] Each of the permanent magnets 201_1, 201_2, 201_3 of the first group may extend over an angular range AP1 of 55° on its annular portion, and the permanent magnets 202_1, 202_2, 202_3 of the second group may extend over an angular range AP1 of 55°.

[0094] 202_3 may extend over an angle range AP2 of 55° ( Figure 5C The regular angular spacing l1 is therefore close to 5° between two adjacent magnets. The second part 3 has only a first group of three permanent magnets 301_1 , 301_2 , 301_3 , which are identical to the first group of permanent magnets of the first part 2 .

[0095] In each of the embodiments, the permanent magnets of the second portion are selected to have the same angular range as the angular range of the permanent magnets of the first portion.

[0096] As a variation of this second configuration, the two magnetic structures can of course be interchanged. A second set of three permanent magnets is then fixed to the second magnetic part 3, these magnets being sandwiched between the magnets of the first set of the second part 3, the first magnetic part remaining in a configuration with a single first set of three permanent magnets.

[0097] Third configuration - Figures 6A to 6C

[0098] Compared to the second configuration, this third configuration adds a second set of the same three permanent magnets 302_1, 302_2, 302_3 to the second part 3 of the magnetic indexing device. The first part remains the same as described above for the second configuration.

[0099] As for the second configuration, each of the three additional magnets is fixed to a respective annular portion of the yoke 30 of the second part 3 on the same face as the three magnets of the first set.

[0100] Each of the three new magnets is sandwiched between two magnets of the first set, leaving a non-zero regular angular spacing l2 from the two magnets of the first set.

[0101] Each permanent magnet 302_1 , 302_2 , 302_3 of the second group may be formed by the shape of a ring portion having a radius of curvature identical to that of the yoke to conform to its shape, and a radial dimension constant over their entire angular range and identical to that of the yoke.

[0102] All three of them are fixed to their supporting surfaces so as to have the same magnetic orientation, parallel to the axial rotation axis and opposite to that of the first set of magnets of the second part 3 .

[0103] They advantageously have the same thickness (defined in the axial direction) as the thickness of the magnets of the first group of the second portion 3 .

[0104] They extend over the same or a smaller angular extent than the magnets of the first set of the second part.

[0105] As an example, considering that the first portion 2 remains in the second configuration described above, the following different embodiments can be distinguished:

[0106] - Each of the permanent magnets 301_1, 301_2, 301_3 of the first group may extend over its annular portion over an angular range AP1 of 100°, and each of the permanent magnets 302_1, 302_2, 302_3 of the second group may extend over an angular range AP2 of 10° ( Fig. 6A The regular angular spacing l2 is therefore close to 5° between two adjacent magnets. The first part 2 has the same configuration, with the magnets being oriented to attract the magnets of the second part 3.

[0107] Each of the permanent magnets 301_1, 301_2, 301_3 of the first group may extend over an angular range AP1 of 80° on its annular portion, and the permanent magnets 302_1, 302_2, 302_3 of the second group may extend over an angular range AP1 of 80°.

[0108] Each of 302_3 may extend over an angle range AP2 of 30° ( Figure 6B ). The regular angular spacing is thus close to 5° between two adjacent magnets. The first part 2 has the same configuration, with the magnets being oriented to attract the magnets of the second part 3.

[0109] Each of the permanent magnets 301_1, 301_2, 301_3 of the first group may extend over an angular range AP1 of 55° on its annular portion, and the permanent magnets 302_1, 302_2, 302_3 of the second group may extend over an angular range AP1 of 55°.

[0110] Each of 302_3 may extend over an angle range AP2 of 55° ( Figure 6C ). The regular angular spacing is thus close to 5° between two adjacent magnets. The first part 2 has the same configuration, with the magnets being oriented to attract the magnets of the second part 3.

[0111] Regardless of the embodiment and configuration, the first group of magnets 201_1, 201_2, 201_3 of the first part 2 and the first group of magnets 301_1, 301_2, 301_3 of the second part 3 are always selected to have the same angular range, and the second group of permanent magnets 202_1, 202_2, 202_3 (if they exist) of the first part 2 and the second group of permanent magnets 302_1, 302_2, 302_3 (if they exist) of the second part 3 are always selected to have the same angular range. Similarly, regardless of the embodiment and configuration, the angular spacing l1, l2 between two adjacent magnets is non-zero, regular, and is selected to be the same. As an example, it is selected to be 2° to 10°, and of course is suitable for the size of the selected magnets.

[0112] As an example, all magnets may have a thickness of 2 mm to 10 mm.

[0113] Figure 7 A diagram is shown illustrating the angular stiffness exerted by the first magnetic part 2 on the second magnetic part 3 for different sizes (angular range AP) of the magnets of the first group when the system is in the first configuration described above, i.e. each yoke 20, 30 has only a single group of three systems. The size configuration is as follows:

[0114] AG (= air gap, i.e. the distance between the two magnetic parts) = 2 mm; HY (= yoke thickness, axial dimension) = 4 mm; HM (= magnet thickness, axial dimension) = 6 mm; TH (= width of magnet and yoke, radial dimension) = 8 mm; AP (= angular range of each magnet) = 55° to 100°.

[0115] It can be seen that the angular stiffness (ordinate) is always highest for magnets of large dimensions, whatever the angular position that the plug adopts about its axis relative to the socket.

[0116] The solution thus has numerous advantages, including:

[0117] - by implementing a six-pole magnetic architecture which allows mechanical coupling by means of magnetic effects in three respective angular positions offset by 120° each;

[0118] - it can be easily adapted to electrically connect the plug to the electrical socket without user intervention and allows ensuring the connection in a plurality of positions;

[0119] - it is easy to manufacture;

[0120] - It is smaller in size, using an annular yoke to free up axial internal space for electrical connections.

[0121] The system of the invention is particularly well suited for use in an electrical installation for charging electric vehicles such as described in patent application WO 2017 / 216458 A1. This installation is characterized in that the plug can be connected to the electrical socket without user intervention by guiding the plug to the socket by means of a magnetic effect.

Claims

1. A three-phase electrical connection system comprising a socket (S), a plug (F), and a magnetic indexing device (1) divided into two parts, a first part (2) being fixed to the socket (S), and a second part (3) being integral with the plug (F), characterized in that: Each of the first part (2) and the second part (3) of the magnetic indexing device comprises: An annular yoke (20, 30) made of ferromagnetic material and comprising a rotation axis (X) and at least one rotation support surface (200, 300) formed in a plane transverse to the rotation axis thereof, the surface being cut into three separate identical annular parts, each of the three identical annular parts having an angular range of 120°, a first set of three identical permanent magnets (201_1, 201_2, 201_3, 301_1, 301_2, 301_3), each of which is fixed to a respective annular portion of the yoke, The three permanent magnets are spaced apart from each other at a non-zero regular first angular interval (I1), The permanent magnets all have the same magnetic orientation parallel to the axis of rotation, the permanent magnets of the first section magnetically attract the permanent magnets of the second section, The plug and the socket comprise corresponding electrical connection members, which are respectively arranged on the plug and the socket to be connected to each other at three respective angular positions of the plug relative to the socket, and the three angular positions are offset from each other by 120°.

2. The system according to claim 1, characterized in that The first part (2) of the magnetic indexing device comprises: three other identical permanent magnets (202_1, 202_2, 202_3) of a second group, each of which is fixed to a respective annular portion of the support surface of the yoke, On the yoke (20), the three permanent magnets of the second group are sandwiched between the two permanent magnets of the first group and are spaced at the same second angular interval relative to each of the two permanent magnets of the first group, The permanent magnets of the second set have an opposite magnetic orientation than the permanent magnets of the first set.

3. The system according to claim 1 or 2, characterized in that: The second part (3) of the magnetic indexing device comprises: a second group of identical three other permanent magnets (302_1, 302_2, 302_3), each of which is fixed to a respective annular portion of the supporting surface of the yoke, On the yoke (30), the three permanent magnets of the second group are sandwiched between the two permanent magnets of the first group and are spaced relative to the two permanent magnets of the first group, The permanent magnets of the second set have an opposite magnetic orientation than the permanent magnets of the first set.

4. The system according to claim 1 or 2, characterized in that: Each permanent magnet of the device is in the shape of a ring segment.

5. The system according to claim 4, characterized in that Each permanent magnet of the first set is formed by a ring portion extending over an angular range chosen to be greater than or equal to 40° but strictly less than 120°.

6. The system according to claim 4, characterized in that Each permanent magnet of the first set is formed by a ring portion extending over an angular range selected from 55° to 100°.

7. The system according to claim 4, characterized in that Each permanent magnet of the first set is formed by a ring portion extending over an angular range selected to be between 70° and 90°.

8. The system according to claim 1, characterized in that The plug (F) comprises three first phase electrical terminals (L1, L2, L3) which mutually form an equilateral triangle.

9. The system according to claim 8, characterized in that The plug (F) comprises a grounding electrical terminal (PE) arranged at the center of the triangle.

10. The system according to claim 8 or 9, characterized in that The plug (F) comprises a neutral electrical terminal (N).

11. The system according to claim 8 or 9, characterized in that: The socket (S) comprises three phase electrical terminals (L1', L2', L3') mutually forming an equilateral triangle identical to the equilateral triangle of the plug, and the three phase electrical terminals are arranged to allow the plug (F) to be connected to the socket (S) in three angular positions offset by 120° each.

12. The system according to claim 11, characterized in that The socket comprises neutral electrical terminals (N1', N2', N3'), which are repeated three times and each of which is arranged to allow the plug (F) to be connected to the socket (S) in three angular positions offset by 120° each.

13. The system according to claim 11, characterized in that The plug (F) carries at least one electrical data transmission terminal (PP, CP), and the socket (S) comprises data transmission terminals (PP1', PP2', PP3', CP1', CP2', CP3') which are repeated three times and each of which is arranged to allow the plug to be connected to the socket in three angular positions each offset by 120°.

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