CN220290563U - Magnetic unit, magnetic assembly, electronic device and device combination - Google Patents

Abstract

The utility model discloses a magnetic unit, a magnetic assembly, electronic equipment and equipment combination, wherein the magnetic unit comprises a magnet, the magnet is provided with a first surface and a second surface which are oppositely arranged, the magnet is provided with a first pole pair and a second pole pair, the first pole pair comprises a first S pole and a first N pole, the second pole pair comprises a second S pole and a second N pole, the first S pole and the second N pole are arranged on the first surface, and the first N pole and the second S pole are arranged on the second surface. The magnetic unit has small magnetic leakage quantity, avoids the interference influence of magnetic leakage on circuits, components and the like, reduces the design process difficulty, is favorable for reducing the whole volume of the electronic equipment and realizing light and thin design, and further can improve the portability of the electronic equipment.

Description

Magnetic unit, magnetic assembly, electronic device and device combination

Technical Field

The utility model relates to the technical field of magnetic attraction, in particular to a magnetic unit, a magnetic assembly, electronic equipment and equipment combination.

Background

The wireless charging technology is a charging technology for transmitting energy between the charger and the power utilization device through a magnetic field, and the convenience of user operation is greatly improved due to the fact that connection of wires is eliminated. At present, in order to ensure the fixing effect, the charger and the power utilization device are connected and fixed in a magnetic attraction mode.

Taking power utilization devices such as mobile phones and the like as an example, the problem of magnetic leakage exists in mobile phones with built-in magnets, and the magnetic leakage can influence a large current path on components such as a camera, a loudspeaker, a vibration motor, an inductor, a circuit board (pcb) and the like, and the influence comprises the failure of the components, the vibration of the circuit board and the like, so that the user experience of the user is reduced.

In the related art, the magnetic leakage limits the placement positions of devices and circuits in the electronic equipment on one hand, increases the difficulty of a design process, and on the other hand, in order to avoid the magnetic interference influence of the magnetic leakage of the magnet, more avoidance needs to be made on the internal space positions of the power utilization devices such as the mobile phone and the like, so that the whole volume of the electronic equipment cannot be reduced, and the portability of the equipment is affected.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides the magnetic unit, which has small magnetic leakage, avoids the interference influence of magnetic leakage on circuits, components and the like, reduces the difficulty of a design process, is beneficial to reducing the whole volume of electronic equipment and realizing light and thin design, and further can improve the portability of the electronic equipment.

The embodiment of the utility model also provides a magnetic assembly comprising the magnetic unit.

The embodiment of the utility model also provides electronic equipment comprising the magnetic unit or the magnetic assembly.

The embodiment of the utility model also provides a device combination comprising the electronic device.

The magnetic unit comprises a magnet, wherein the magnet is provided with a first surface and a second surface which are oppositely arranged, the magnet is provided with a first pole pair and a second pole pair, the first pole pair comprises a first S pole and a first N pole, the second pole pair comprises a second S pole and a second N pole, the first S pole and the second N pole are arranged on the first surface, and the first N pole and the second S pole are arranged on the second surface.

The magnetic unit of the embodiment of the utility model has small magnetic leakage, avoids the interference influence of magnetic leakage on circuits, components and the like, reduces the difficulty of a design process, is beneficial to reducing the whole volume of electronic equipment and realizing light and thin design, and further can improve the portability of the electronic equipment.

In some embodiments, the direction of magnetization from the first S-pole to the first N-pole is arranged orthogonal to the first face and/or the second face;

and/or the magnetizing direction from the second S pole to the second N pole is arranged orthogonal to the first face and/or the second face.

In some embodiments, the magnet is formed by splicing a first magnetic part and a second magnetic part, and the splicing position of the first magnetic part and the second magnetic part is positioned between the first surface and the second surface, the first pole pair is arranged on the first magnetic part, and the second pole pair is arranged on the second magnetic part.

In some embodiments, the first magnetic portion and the second magnetic portion are each anisotropic magnets.

In some embodiments, the magnet is arcuate and has oppositely disposed inner and outer arcuate sides, one of the first and second pole pairs being disposed adjacent the inner arcuate side and the other being disposed adjacent the outer arcuate side.

In some embodiments, the magnetic conducting piece is connected to the second surface in a fitting way and used for restraining a magnetic induction line from the first N pole to the second S pole in the magnet and/or the magnetic conducting piece.

In some embodiments, the magnetic conductive member is made of a soft magnetic material.

The magnetic assembly according to the embodiment of the utility model comprises a plurality of magnetic units according to any one of the embodiments, wherein the plurality of magnetic units are sequentially connected, the first surfaces of the plurality of magnetic units are all positioned on the same side of the magnetic group, and the second surfaces of the plurality of magnetic units are all positioned on the other same side of the magnetic group.

In some embodiments, the magnetic groups are arc-shaped or ring-shaped.

The electronic device of the embodiment of the utility model comprises a first magnetic module, wherein the first magnetic module is the magnetic unit in any embodiment or the magnetic group in any embodiment.

In some embodiments, the first housing is provided with a fitting groove, at least part of the first magnetic module is embedded in the fitting groove, and the first face faces the outer side of the first housing.

In some embodiments, a first housing is included that is integrally formed with a magnetically permeable portion configured as the first magnetic module with the first face facing outward of the housing.

The device combination of the embodiment of the utility model comprises a first device and a second device which can be fixed by magnetic attraction, wherein the first device is the electronic device in any embodiment, the second device comprises a second shell and a second magnetic module, the second magnetic module is fixed on the second shell, and the first device and the second device realize the magnetic attraction fixation through the magnetic attraction effect of the first magnetic module and the second magnetic module.

Drawings

FIG. 1 is a schematic diagram of a magnetic unit according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a second magnetic unit of fig. 1.

Fig. 3 is a schematic diagram of a magnetic unit according to another embodiment of the utility model.

FIG. 4 is a schematic top view of a magnetic unit according to an embodiment of the utility model.

FIG. 5 is a schematic view of a magnetic assembly according to an embodiment of the present utility model.

Fig. 6 is a perspective schematic view of an electronic device of an embodiment of the utility model.

Fig. 7 is a schematic cross-sectional view at A-A in fig. 6.

Fig. 8 is a partial schematic view of prior art magnetic attraction fixation of a first device and a second device.

FIG. 9 is a schematic diagram of a second magnetic module according to an embodiment of the utility model.

FIG. 10 is a schematic diagram of the magnetic attraction fixing of the first magnetic module and the second magnetic module according to the embodiment of the utility model.

FIG. 11 is a partial schematic view of a first magnetic module of the prior art.

FIG. 12 is a schematic diagram showing the distribution of magnetic induction lines of a first magnetic module and a second magnetic module in the prior art when the first magnetic module and the second magnetic module are magnetically fixed.

FIG. 13 is a schematic diagram of the magnetic attraction fixing of the first magnetic module and the second magnetic module according to the embodiment of the utility model.

FIG. 14 is a schematic diagram showing the distribution of magnetic induction lines of the first magnetic module and the second magnetic module when the first magnetic module and the second magnetic module are magnetically fixed.

Fig. 15 is a schematic diagram showing magnetic induction lines of a first magnetic module (including a magnetic conductive member) and a second magnetic module according to another embodiment of the present utility model when the first magnetic module and the second magnetic module are magnetically fixed.

FIG. 16 is a schematic illustration of the magnetic attraction fixing of the first magnetic module and the second magnetic module according to another embodiment of the utility model.

Reference numerals:

a magnetic unit 10;

a magnet 1; a first face 11; a second face 12; a first pole pair 13; a first S-pole 131; a first N-pole 132; a second pole pair 14; a second S-pole 141; a second N-pole 142; a split 15; a first magnetic portion 16; a second magnetic part 17; an inner arc side 18; an outer arc side 19;

magnetizing direction 2; a first magnetizing direction 21; a second magnetizing direction 22;

a magnetic conductive member 3;

a first device 200; a first housing 201; a magnetic conduction part 2011; a first magnetic module 202; a fitting groove 203;

a second device 300; a second housing 301; a second magnetic module 302.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The magnetic unit 10 of the embodiment of the present utility model includes the magnet 1, and the magnet 1 has the first face 11 and the second face 12 arranged opposite to each other, for example, as shown in fig. 1, the first face 11 and the second face 12 may be arranged opposite to each other in the up-down direction, wherein the first face 11 may be a lower surface of the magnet 1, and the second face 12 may be an upper surface of the magnet 1. In other embodiments, the magnetic unit 10 may have the first surface 11 and the second surface 12 arranged in the left-right direction, the front-back direction, or the like, depending on the actual use condition.

As shown in fig. 1, the magnet 1 is provided with a first pole pair 13 and a second pole pair 14, and it should be noted that the pole pairs are paired magnetic poles, that is, one S pole and one N pole form one pole pair. The magnet 1 in the present embodiment is provided with two pole pairs, which are a first pole pair 13 and a second pole pair 14, respectively, for convenience of distinction, and the first pole pair 13 and the second pole pair 14 may be arranged at intervals in the left-right direction.

The first pole pair 13 may be disposed on the left side of the magnet 1, and the first pole pair 13 includes a first S pole 131 and a first N pole 132, wherein the first S pole 131 may be disposed on the first surface 11, and the first N pole 132 may be disposed on the second surface 12. The second pole pair 14 may be disposed on the right side of the magnet 1, and the second pole pair 14 includes a second S pole 141 and a second N pole 142, wherein the second S pole 141 may be disposed on the second face 12 and the second N pole 142 may be disposed on the first face 11.

Thus, the induction line 2 of the magnet 1 is outputted from the first N pole 132 and further from the second S pole 141, then outputted from the second S pole 141 and into the second N pole 142, then outputted from the second N pole 142 and into the first S pole 131, then outputted from the first S pole 131 and into the first N pole 132, thereby being able to go from the ring-shaped magnetic circuit.

In the related art, as shown in fig. 11, the magnetizing direction 2 in the magnetic unit 10 is mostly arranged along the radial direction (left-right direction) of the magnet 1, and this magnetizing design makes the magnetic induction lines 2 of the magnetic unit 10 in use appear as a pattern as in fig. 12, that is, have a large range of distribution of the magnetic induction lines 2 at both the left and right ends of the magnetic unit 10, thereby causing a serious problem of magnetic leakage.

According to the magnetic unit 10 provided by the embodiment of the utility model, by designing two pole pairs, and arranging the S pole and the N pole of each pole pair on two surfaces which are oppositely arranged (along the axial direction of the magnetic body 1), as shown in fig. 14 and 15, the magnetic induction lines 2 are distributed on the outer sides of the first surface 11 and the second surface 12, so that the radius of the magnetic induction lines 2 on the periphery of the magnetic unit 10 is reduced, the magnetic leakage quantity of the magnetic body 1 is reduced, the interference influence of the magnetic leakage on circuits, components and the like is avoided, the constraint limit condition of the magnetic leakage on the arrangement positions of the components, the circuits and the like of the electronic equipment is improved, and the design process difficulty is reduced.

Secondly, the situation that more avoidance needs to be carried out on the internal space positions of the power utilization device such as the mobile phone to reduce the influence of magnetic interference is avoided, so that the whole volume of the electronic equipment is reduced, the light and thin electronic equipment is realized, and the effect of improving the portability of the electronic equipment is achieved.

In some embodiments, the magnetization direction 2 from the first S-pole 131 to the first N-pole 132 is arranged orthogonal to the first face 11 and/or the second face 12. For example, as shown in fig. 1 to 3, the first face 11 and the second face 12 may be disposed substantially in parallel and may be both horizontal, and when the magnet 1 is magnetized, the magnetization may be performed in a direction orthogonal to the first face 11 and the second face 12, whereby the magnetization direction 2 from the first S pole 131 to the first N pole 132 (hereinafter referred to as a first magnetization direction 21) may extend in the up-down direction (axial direction), which is advantageous in further reducing the distribution of the magnetization lines 2 on the left side and further improving the problem of magnetic leakage.

It will be appreciated that in other embodiments, the first face 11 and the second face 12 may be arranged non-parallel, and that the first magnetization direction 21 may be arranged perpendicular to one of the first face 11 and the second face 12.

Similarly, in some embodiments, the direction of magnetization 2 from the second S-pole 141 to the second N-pole 142 is arranged orthogonal to the first face 11 and/or the second face 12. For example, as shown in fig. 1 to 3, the first face 11 and the second face 12 may be disposed substantially in parallel and may be both horizontal, and when the magnet 1 is magnetized, the magnetization may be performed in a direction orthogonal to the first face 11 and the second face 12, whereby the magnetization direction 2 from the second S pole 141 to the second N pole 142 (hereinafter referred to as the second magnetization direction 22) may extend in the up-down direction (axial direction), which is advantageous in further reducing the distribution of the magnetization lines 2 on the right side and further improving the problem of magnetic leakage.

It will be appreciated that in other embodiments, the first and second faces 11, 12 may be arranged non-parallel, in which case the second direction of magnetization 22 may also be arranged perpendicular to one of the first and second faces 11, 12.

In some embodiments, the magnet 1 is formed by splicing the first magnetic part 16 and the second magnetic part 17, and the spliced portion 15 of the first magnetic part 16 and the second magnetic part 17 is located between the first face 11 and the second face 12, the first pole pair 13 is provided on the first magnetic part 16, and the second pole pair 14 is provided on the second magnetic part 17.

For example, as shown in fig. 3, the magnet 1 in the present embodiment includes two parts, which are a first magnetic part 16 and a second magnetic part 17, respectively, and the first magnetic part 16 and the second magnetic part 17 may be connected in the left-right direction. The joint 15 between the first magnetic part 16 and the second magnetic part 17 is the joint between the right side surface of the first magnetic part 16 and the left side surface of the second magnetic part 17.

The first magnetic part 16 and the second magnetic part 17 may each be an anisotropic magnet. The anisotropic magnet is the magnet 1 with different magnetic properties in different directions, and the direction in which the anisotropic magnet can obtain the best magnetic properties is the orientation direction of the magnet. Specifically, in this embodiment, the first magnetic portion 16 and the second magnetic portion 17 may be magnets such as sintered neodymium iron boron, sintered ferrite, and the like.

In manufacturing the magnet 1, the first magnetic portion 16 and the second magnetic portion 17 may be magnetized first, and then the first magnetic portion 16 and the second magnetic portion 17 may be fixed by adhesion or the like. In other embodiments, the first magnetic part 16 and the second magnetic part 17 may be integrated by a sintering process, and then the first magnetic part 16 and the second magnetic part 17 may be magnetized by applying a magnetic field thereto.

The directions of the magnetizing directions 2 in the first magnetic portion 16 and the second magnetic portion 17 are opposite to each other due to the difference in magnetizing directions, for example, the first magnetizing direction 21 in the first magnetic portion 16 extends in a substantially bottom-to-top direction, and the second magnetizing direction 22 in the second magnetic portion 17 extends in a substantially top-to-bottom direction. The split design of the magnet 1 facilitates the magnetizing design, and further facilitates the processing and forming of the magnet 1.

In some embodiments, the magnet 1 is arcuate and has oppositely disposed inner and outer arcuate sides 18, 19, with one of the first and second pole pairs 13, 14 disposed adjacent the inner arcuate side 18 and the other disposed adjacent the outer arcuate side 19.

For example, as shown in fig. 4, the magnet 1 may be generally fan-shaped and have inner and outer arc sides 18 and 19 disposed opposite each other in the inner and outer directions, wherein the first pole pair 13 may be disposed adjacent to the inner arc side 18, the second pole pair 14 may be disposed adjacent to the outer arc side 19, and in other embodiments, the first pole pair 13 may be disposed adjacent to the inner arc side 18, and the second pole pair 14 may be disposed adjacent to the outer arc side 19. The arc design of the magnet 1 facilitates the subsequent splicing of the plurality of magnetic units 10 into a ring shape or an arc shape, thereby meeting the use requirement of the magnetic attraction of the circumference.

In some embodiments, the magnetic unit 10 includes a magnetically permeable member 3, the first face 11 forms a magnetically attractive working surface of the magnetic unit 10, the second face 12 forms a non-magnetically attractive working surface, and the magnetically permeable member 3 is snugly connected to the second face 12 and is configured to constrain the magnetically permeable wire 2 from the first N pole 132 to the second S pole 141 within the magnet 1 and/or the magnetically permeable member 3.

For example, as shown in fig. 3, the magnetic conducting member 3 may be in a flat plate shape, the magnetic conducting member 3 may be stacked on the second surface 12 of the magnet 1, and the magnetic conducting member 3 has a higher magnetic permeability, and the magnetic conducting member 3 may be stacked to better constrain the magnetic induction line 2, so that the problem of reducing the magnetic leakage of the non-magnetic attraction working surface can be further solved, and as shown in fig. 15, the magnetic leakage of one side of the second surface 12 of the magnetic unit 10 is improved.

It should be noted that, the magnetic conductive member 3 may generally bind the magnetic induction wire 2 in the magnet 1, and in other embodiments, the magnetic conductive member 3 and the magnet 1 may each have the magnetic induction wire 2 distributed therein.

Optionally, the magnetic conductive member 3 is made of a soft magnetic material, and the soft magnetic material may be a ferrosilicon alloy, a ferroaluminum alloy, a ferronickel alloy, or the like.

The following describes a magnetic assembly of an embodiment of the present utility model.

The magnetic assembly according to the embodiment of the present utility model includes a plurality of magnetic units 10, where the magnetic units 10 may be the magnetic units 10 described in any of the above embodiments, as shown in fig. 5, the plurality of magnetic units 10 may be sequentially connected along a circumferential direction, so that the magnetic assembly may be integrally formed into an arc shape, and in other embodiments, the plurality of magnetic units 10 may be spliced into a closed loop shape, for example, the magnetic assembly may be integrally formed into a ring shape, etc. The arc-shaped or annular design can realize circumferential magnetic attraction fixation, thereby meeting the use requirements of magnetic attraction in different directions and also ensuring the strength of the magnetic attraction fixation structure.

It should be noted that, when the plurality of magnetic units 10 are assembled, the first faces 11 of the plurality of magnetic units 10 are all located on the same side of the magnetic group, and the second faces 12 of the plurality of magnetic units 10 are all located on the other same side of the magnetic group. For example, the first faces 11 of the plurality of magnetic units 10 may each be located on the underside of the magnetic group, and the plurality of first faces 11 may be arranged substantially coplanar, the second faces 12 of the plurality of magnetic units 10 may each be located on the upper side of the magnetic group, and the plurality of second faces 12 may be arranged substantially coplanar.

Thus, the plurality of first surfaces 11 may form an entire magnetically attractable working surface, or the plurality of second surfaces 12 may form an entire non-magnetically attractable working surface. Thereby satisfying the use requirement of large-scale magnetic attraction fixation, and also ensuring the restraint effect on the magnetic induction line 2 when a plurality of magnetic units 10 are combined, and further avoiding the problem of magnetic leakage.

The electronic device of the embodiment of the utility model is described below.

The electronic device according to the embodiment of the present utility model includes the first magnetic module 202, where the first magnetic module 202 may be the magnetic unit 10 described in any of the above embodiments, and in other embodiments, the first magnetic module 202 may be the magnetic assembly described in any of the above embodiments. As shown in fig. 6 to 8, the electronic device may include a first housing 201, and a first magnetic module 202 may be fixed to an inner side of the first housing 201. In use, the first magnetic module 202 can be used to fix the electronic device by magnetic attraction.

In some embodiments, as shown in fig. 13, the electronic apparatus includes a first housing 201, the first housing 201 is provided with a fitting groove 203, and the fitting groove 203 may be provided on an inner wall surface of the housing. The mounting groove 203 may be an annular groove, and at least a portion of the first magnetic module 202 may be embedded in the mounting groove 203 when mounted, i.e., a portion of the first magnetic module 202 may be embedded in the mounting groove 203, or in other embodiments, the first magnetic module 202 may be completely embedded in the mounting groove 203. And when the electronic equipment is installed, the first surface 11 of the first magnetic module 202 can face to the outer side of the shell, so that the use requirement of magnetic attraction and fixation of the electronic equipment is met.

As shown in fig. 13, the arrangement of the assembly slot 203 can reduce the overall dimension thickness of the first magnetic module 202 and the first housing 201, and reduce the distance between the first magnetic module 202 and the magnetic fixing position of the electronic device, thereby reducing the magnetic resistance and enhancing the strength of the magnetic fixing. On the other hand, the reduction of the thickness can reduce the whole volume of the electronic equipment, thereby being beneficial to realizing the light and thin design of the electronic equipment and improving the portability. In addition, the fixing effect of the first magnetic module 202 can be enhanced by the stop limit of the assembly groove 203.

In some embodiments, the electronic device includes a first housing 201, the first housing 201 can be machined from an isotropic magnetic material that can be magnetized, and the housing does not create magnetism without being magnetized. As shown in fig. 16, the first housing 201 is integrally formed with a magnetic conductive portion 2011, where the magnetic conductive portion 2011 may be disposed in the middle of the first housing 201, and during processing, only a portion of the first housing 201 may be magnetized, and the magnetic conductive portion 2011 is formed after magnetizing, and the magnetic conductive portion 2011 is configured as the first magnetic module 202, and when installed, the first surface 11 of the first magnetic module 202 may face the outside of the first housing 201, thereby satisfying the use requirement of fixing the electronic device by magnetic attraction.

Thus, since the magnet attraction function is realized by magnetizing a part of the first housing 201 directly used, the situation of stacking the magnet 1 in the first housing 201 is avoided, and the effect of reducing the stacking thickness is directly achieved.

The device combinations of the embodiments of the present utility model are described below.

The device combination according to the embodiment of the present utility model includes a first device 200 and a second device 300 that can be magnetically fixed, where the first device 200 may be an electronic device described in any of the foregoing embodiments, and as shown in fig. 8, the second device 300 may include a second housing 301 and a second magnetic module 302, where the second magnetic module 302 is fixed to the second housing 301, and the first device 200 and the second device 300 implement magnetic fixation through magnetic attraction of the first magnetic module 202 and the second magnetic module 302.

In some embodiments, as shown in fig. 9 and 10, the second magnetic module 302 may also be a ring, and the second magnetic module 302 may also be formed by splicing independent magnets, so that, in use, the first magnetic module 202 and the second magnetic module 302 may achieve magnetic attraction fixation in the circumferential direction, thereby ensuring the fixation effect.

In the device combination according to the embodiment of the present utility model, the first device 200 may be specifically an RX device, and the second device 300 may be specifically a TX device. The magnetic flux density of the magnetic induction line 2 of the first device 200 in fig. 14 and 15 is greater on the side of the magnetic attraction working face (the side toward the second device 300) than the device combination in the related art (as shown in fig. 12), thereby ensuring the magnetic attraction adhesion with the second device 300.

Secondly, the distribution range of the magnetic induction lines 2 on the periphery side of the first magnetic module 202 is smaller, and the magnetic conduction piece 3 is arranged on one side of the non-magnetic attraction working surface to be minimum, so that the problem of magnetic leakage is solved, the influence on components such as a circuit board and an inductor on one side of the non-magnetic attraction working surface is reduced, and the light and thin design of equipment is facilitated.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims (13)

1. The magnetic unit is characterized by comprising a magnet, wherein the magnet is provided with a first surface and a second surface which are oppositely arranged, the magnet is provided with a first pole pair and a second pole pair, the first pole pair comprises a first S pole and a first N pole, the second pole pair comprises a second S pole and a second N pole, the first S pole and the second N pole are arranged on the first surface, and the first N pole and the second S pole are arranged on the second surface.

2. The magnetic unit according to claim 1, characterized in that the direction of magnetization from the first S-pole to the first N-pole is arranged orthogonal to the first face and/or the second face;

and/or the magnetizing direction from the second S pole to the second N pole is arranged orthogonal to the first face and/or the second face.

3. The magnetic unit of claim 1, wherein the magnet is formed by a first magnetic portion and a second magnetic portion, and the split of the first magnetic portion and the second magnetic portion is located between the first face and the second face, the first pole pair being disposed on the first magnetic portion, and the second pole pair being disposed on the second magnetic portion.

4. A magnetic unit according to claim 3, wherein the first and second magnetic portions are anisotropic magnets.

5. The magnetic unit of claim 1, wherein the magnet is arcuate and has oppositely disposed inner and outer arcuate sides, one of the first and second pole pairs being disposed adjacent the inner arcuate side and the other being disposed adjacent the outer arcuate side.

6. The magnetic unit of any of claims 1-5, comprising a magnetically permeable member, the first face forming a magnetically attractive working surface of the magnetic unit and the second face forming a non-magnetically attractive working surface, the magnetically permeable member being snugly connected to the second face and adapted to constrain a magnetic induction line from the first N-pole to the second S-pole within the magnet and/or the magnetically permeable member.

7. The magnetic unit of claim 6, wherein the magnetically permeable member is made of a soft magnetic material.

8. A magnetic assembly comprising a plurality of magnetic units as claimed in any one of claims 1 to 7, wherein a plurality of said magnetic units are connected in sequence, and wherein said first faces of a plurality of said magnetic units are all on the same side of the magnetic group and said second faces of a plurality of said magnetic units are all on the other same side of the magnetic group.

9. The magnetic assembly of claim 8, wherein the magnetic group is arcuate or ring-shaped.

10. An electronic device comprising a first magnetic module being a magnetic unit as claimed in any one of the preceding claims 1-7 or a magnetic group as claimed in claim 7 or 8.

11. The electronic device of claim 10, comprising a first housing, the first housing having a mounting slot, at least a portion of the first magnetic module being embedded in the mounting slot, and the first face facing outward of the first housing.

12. The electronic device of claim 10, comprising a first housing integrally formed with a magnetically permeable portion configured as the first magnetic module with the first face facing outward of the housing.

13. A device combination, comprising a first device and a second device that are magnetically attractable, the first device being an electronic device according to any one of the preceding claims 10-12, the second device comprising a second housing and a second magnetic module, the second magnetic module being fixed to the second housing, the first device and the second device being magnetically attractable by magnetic attraction of the first magnetic module and the second magnetic module.