CN112042210B - Magnet actuator for electronic device and electronic device including the same - Google Patents

Abstract

A magnet exciter (1) for an electronic device (2) comprising: a coil (3), a magnet (4), a first casing (5) and a second casing (6), wherein the coil (3) The magnet (4) is at least partially located in and fixed to the first casing (5); the magnet (4) is located at least partially in the second casing (6) and fixed to the second casing (5). on the housing (6). The first housing (5) comprises a magnetic material, and a magnetic field generated by the magnet (4) and the first housing (5) is generated between the magnet (4) and the first housing (5) Attractive force (F), the magnet (4) and the first housing (5) are in force equilibrium, wherein an air gap (7) is provided between the magnet (4) and the coil (3) ). Operating the current in the coil (3) causes the attractive force (F) to change, causing displacement between the magnet (4) and the first housing (5), so that within the electronic device (2) produce vibration.

Description

Magnet exciter for electronic equipment and electronic equipment including the same

technical field

The present invention relates to a magnet exciter for electronic equipment, which includes a coil, a magnet, a first casing and a second casing.

Background technique

Electronic devices may be configured with magnetic exciters to generate, for example, sound waves. Prior art magnet exciters include magnets that attract or repel each other. Initially, the magnets are set to force balance, but to generate sound waves, the attractive or repulsive force between the magnets is changed by an electric current flowing through a coil located between the magnets, the current moving at least one of the magnets , thereby reducing or increasing the distance between the magnets.

As disclosed in GB2532436, the magnets may be connected to each other by elastic support elements which counteract the attractive or repulsive forces between the magnets, so that as long as there is no current flow, the magnets and the elastic support elements are in force equilibrium state. The different parts of the magnet exciter in GB2532436 are integrated in the device structure and are arranged between the main elements of the device.

The appearance of the assembled electronic device can only be assessed after a state of force equilibrium has been reached, eg after the main elements of the device are assembled. Any possible defects due to changes in dimensional tolerances of each individual element in the structure, changes in force between magnets, or changes in forces caused by elastic support elements are only visible after assembly, and subsequent repairs are time-consuming and costly high.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an improved magnet exciter. These and other objects are achieved by the features of the independent claims. Further embodiments are apparent from the dependent claims, the detailed description and the drawings.

According to a first aspect, a magnet exciter for an electronic device is provided. The magnet exciter includes a coil, a magnet, a first housing and a second housing, wherein the coil is at least partially located within and fixed to the first housing, and the magnet is at least partially located within the first housing The second housing is in and fixed on the second housing; the first housing includes a magnetic material; the magnet and the first housing generate a magnetic field, and the magnetic field is between the magnet and the first housing generating an attractive force; the magnet and the first housing are in force equilibrium, wherein an air gap is provided between the magnet and the coil; and operating a current in the coil to change the attractive force , so that displacement occurs between the magnet and the first housing.

In the magnet exciter, the magnet and the housing are in a state of force balance, which is beneficial to manufacture an electronic device provided with the magnet exciter. The attractive forces created by the magnets and the housing are initially balanced so that other parts of the electronic device are not affected by, for example, changes in force or dimensional changes in different parts of the magnet exciter. This solution reduces the number of defective electronic devices, thereby reducing manufacturing and repair costs. In an implementation of the first aspect, it should be pointed out that the magnet exciter includes only one magnet. For example, the magnet exciter does not include other magnets other than those described above.

In a possible implementation manner of the first aspect, the magnet exciter further includes at least one spacer, and the spacer drives the magnet and the first spacer through a reaction force as a force generated by the magnetic field. The housing maintains a force-balanced state such that the magnet and the coil are always separated by a uniform air gap.

In another possible implementation manner of the first aspect, the spacer is used to provide a first air gap between the magnet and the coil when the magnet exciter is at the first execution end position, And when the magnet exciter is in the second actuating end position, a second air gap is provided between the magnet and the coil that is smaller than the first air gap, thereby providing a space efficient magnet arrangement.

In another possible implementation manner of the first aspect, the spacer at least interconnects the first casing and the second casing, and/or interconnects the first casing and the magnet, This allows the magnetic exciter to be configured as an integral component that is easy to install in electronic equipment.

In another possible implementation manner of the first aspect, the gasket is compressible and fixed on the inner surface of the first housing; when the magnet exciter is at the first execution end position, The gasket is in an uncompressed state; when the magnet exciter is in any position other than the first execution end position, including the second execution end position, the gasket is in a compressed state, which is beneficial to The exciter is sufficiently powerful and space-saving.

In another possible implementation of the first aspect, the gasket includes a flexible gasket.

In another possible implementation of the first aspect, the gasket includes a dust cover connected to the first housing and the second housing, wherein the dust cover covers the first housing and the second housing to prevent dust and other particles from entering the exciter from interfering with the function of the exciter.

In another possible implementation manner of the first aspect, the gasket includes the flexible gasket and the dust cover.

In another possible implementation manner of the first aspect, the first housing and the second housing confine the magnetic field to guide the magnetic field in at least one of the first housing and the second housing. space, thereby preventing the magnetic field from interfering with other objects.

In another possible implementation manner of the first aspect, the first casing and the second casing have open ends and a closed base connected by a surrounding wall, and one of the first casing and the second casing has an open end and a closed base connected by a wall. The inner circumference substantially corresponds to the outer circumference of the other of the first and second housings, allowing movement between the first and second housings. This is a simple but reliable structure that provides adequate protection for the magnet arrangement and efficiently confines the magnetic field within the cavity formed by the first and second housings.

In another possible implementation of the first aspect, the first housing and the second housing partially overlap such that the magnet exciter is assembled and maintained as an integral part.

In another possible implementation manner of the first aspect, the first housing and the second housing comprise interconnecting flanges, when the magnet exciter is in the first execution end position or the second execution end position , the interconnecting flanges are connected to prevent separation of the components of the magnet exciter no matter what external force is applied to the magnet exciter.

According to a second aspect, there is provided an electronic device including a movable face and a device chassis; and

The above-mentioned magnet exciter is disposed between the movable surface and the equipment case, and is used for moving the movable surface relative to the equipment case. The movable surface may be a display screen of the electronic device. In this case, the display can be used as a so-called "whistle display".

By configuring the magnetic exciter in the electronic device, wherein the magnetic exciter is in equilibrium from the start, other components of the electronic device are not affected by, for example, changes in force or within the magnetic exciter. The effect of dimensional changes. This solution reduces the number of defective electronic devices, thereby reducing manufacturing and repair costs.

In a possible implementation of the second aspect, the first housing of the magnetic exciter is attached to the movable surface, and the second housing of the magnetic exciter is attached to the equipment chassis, or , the second shell of the magnet exciter is attached to the movable surface, and the first shell of the magnet exciter is attached to the equipment case, so that the magnet exciter is very stable and can withstand large external force.

In another possible implementation of the second aspect, the movement of the movable surface generates vibrations within the electronic device for use as a force feedback device or for the generation of sound waves.

According to a third aspect, there is provided an assembly for assembling a magnet exciter, comprising a magnet exciter as described above and an assembly pin, wherein a first housing of the magnet exciter includes a through-hole for receiving the assembly pin a slot; a first end of the assembling pin is releasably connected to the inner surface of the second housing after passing through the through slot, and a second end of the assembling pin is releasably connected to the inner surface of the first housing the outer surface, so that the first housing and the second housing are connected to each other, and the magnet and the coil are always kept a predetermined distance from each other by the assembling pin.

In this solution, the assembly of the magnet exciter is facilitated by ensuring that the air gap between the magnet and the coil is maintained at the desired distance throughout the assembly stage, including when interconnecting the different components by adhesive.

In a possible implementation manner of the third aspect, the assembly pin is T-shaped, and when the assembly pin is received by the through slot, one leg of the assembly pin is along a path in the magnet exciter. The extension of the direction of attraction generated by the magnetic field, and the extension of one leg of the assembly pin in a plane perpendicular to the direction of attraction, is beneficial to provide a simple and stable solution for securing the magnet and the coil during assembly The air gap between them is kept at a predetermined distance.

In another possible implementation manner of the third aspect, at least one of the magnet and the spacer includes another through groove for accommodating the assembling pin, so as to ensure that during the assembling process, including when the adhesive is used The parts of the magnet exciter remain in place when the different parts are interconnected.

This and other aspects will be apparent from the embodiments described below.

Description of drawings

In the following detailed description of the invention, these aspects, embodiments, and implementations are explained in detail with reference to example embodiments shown in the accompanying drawings, wherein:

1 is an exploded view of a magnet exciter according to one embodiment of the present invention;

Figure 2a shows a partial side sectional view of the magnet exciter of Figure 1;

Fig. 2b shows an enlarged side sectional view of the magnet exciter shown in Fig. 2a, wherein the magnet exciter is in a first actuating end position;

Fig. 2c shows an enlarged side cross-sectional view of the magnet exciter shown in Figs. 2a and 2b, wherein the magnet exciter is in a second actuating end position;

Figure 3 shows a side cross-sectional perspective view of an electronic device including the magnetic exciter of Figures 1 and 2a to 2c;

Figure 4a shows a side cross-sectional view of a magnet exciter according to one embodiment of the present invention;

Figure 4b shows a side view of the magnet exciter shown in Figure 4a;

5 shows a side cross-sectional view of a magnet exciter according to another embodiment of the present invention;

6 shows a side cross-sectional view of a magnet exciter according to another embodiment of the present invention;

FIG. 7 shows a schematic cross-sectional side view of a magnet exciter according to another embodiment of the present invention;

FIG. 8 shows a schematic side cross-sectional view of a magnet exciter according to another embodiment of the present invention.

Detailed ways

Figures 1 and 2a to 2c show an embodiment of a magnet exciter 1 according to the invention.

The magnet exciter 1 includes a first casing 5 , a second casing 6 , a coil 3 and a magnet 4 . The coil 3 includes a plurality of coil windings, and is located at least partially within the first housing 5 and is fixed to the first housing 5 . In one embodiment, the coil 3 is fixed on the inner surface 5a of the first housing 5 by adhesive. The magnet 4 is located at least partially within the second housing 6 and is fixed to the second housing 6 . In one embodiment, the magnet 4 is fixed on the inner surface 6a of the second housing 6 by adhesive. In one embodiment, the magnet exciter 1 includes only one magnet, eg the magnet 4 . No other magnets are arranged between the casings 5 and 6 .

The first housing 5 comprises a magnetic material, such as metal, so that the first housing 5 acts as a counterforce to the static attractive force F. Therefore, the magnet 4 located in the second housing 6 and the first housing 5 together generate a magnetic field, wherein the magnetic field generates an attractive force F between the magnet 4 and the magnetic first housing 5 , the magnet 4 and the magnetic first housing 5 are pulled towards each other, and the second housing 6 and the coil 3 are pulled towards each other.

The first housing 5 and the second housing 6 guide and confine the magnetic field to a space within at least one of the first housing 5 and the second housing 6 . The magnetic field may be confined by the housing so that the magnetic field fills the entire space within the housing. The magnetic field may also be directed into the housing such that the magnetic field is strongest at specific locations within the housing, eg, at the air gap described below.

As long as there is no current in the coil 3, the magnet 4 and the first housing 5 are in a state of force equilibrium. Due to this balance, a specific air gap 7 can be provided to separate the magnet 4 and the coil 3 .

Operating the current in the coil 3 changes the attractive force F, thereby causing displacement between the magnet 4 and the first housing 5 . By operating the current continuously, the displacement is continuous. Therefore, any surface connected to the first housing 5 or the second housing 6 can be vibrated.

In one embodiment, the magnet exciter 1 includes at least one spacer 8 . The spacer 8 is provided to maintain the magnet 4 and the first housing 5 in a force-balanced state by acting as a reaction force to the attractive force F generated by the magnetic field, and to maintain the magnet 4 and the first housing 5 in a state of force balance. The size of the air gap between the coils 3 is maintained at a fixed height, as described below. In addition, the spacer 8 prevents the first casing 5 and the second casing 6 from colliding with each other to generate unnecessary noise.

However, the force equilibrium state can also be achieved by the size of the air gap, the attractive force F and the spring force of the surface to which the magnet exciter is attached.

When the magnet exciter 1 is in the first execution end position P1, the spacer 8 provides a first air gap 7a between the magnet 4 and the coil 3, eg, an air gap having a certain height. Figure 2b shows the magnet exciter 1 in the first actuating end position P1, the size of which is exaggerated for clarity. Figure 2a shows a more realistic relationship between the air gap, magnet and coil when the magnet exciter 1 is in the first actuating end position P1. The first actuating end position P1 means that the exciter is at its outermost position, that is, the position where the height of the magnet exciter is as large as possible, and at this position, the maximum vibration amplitude is reached when the displacement due to the current is generated. .

When the magnet exciter 1 is in the second execution end position P2, the spacer 8 also provides a second air gap 7b between the magnet 4 and the coil 3, eg, higher than the first air gap 7b. The gap 7a is a small air gap. The second air gap 7b refers to an air gap that is physically the same as the first air gap 7a but has a different height. The second actuating end position P2 means that the exciter is in its innermost position, that is, the position where the height of the magnet exciter is as small as possible, and at this position, the minimum vibration amplitude is reached when the displacement due to the current is generated. .

The spacer 8 interconnects the first casing 5 and the second casing 6, or interconnects the first casing 5 and the magnet 4, or interconnects the first casing 5 and the second casing 5. Two housings 6 are interconnected and interconnect the first housing 5 and the magnet 4 .

In one embodiment, the gasket 8 is compressible, eg in the form of a flexible elastic gasket 8a, and is fixed to the inner side surface 5a of the first housing 5 by, eg, an adhesive. When the magnet exciter 1 is in the first execution end position P1, the gasket 8 is in an uncompressed state, as shown in FIG. 2b. When there is no current in the coil 3, the magnet exciter 1 is in the first execution end position P1. When the magnet exciter 1 is in any position other than the first execution end position, including the second execution end position P2 as shown in FIG. 2c , the gasket 8 is in a compressed state. The compressible spacer also acts to levitate the magnet exciter.

In another embodiment, the gasket 8 comprises a flexible dust cover 8b connected to the first shell 5 and the second shell 6, preferably to the first shell 5 and the second shell 6 The outer peripheral surfaces of the second shells 6 make the flexible dust cover cover any circumferential gap existing between the first shell 5 and the second shell 5 .

In a preferred embodiment, the gasket 8 includes a flexible gasket 8a and a dust cover 8b.

The first shell 5 and the second shell 6 each have an open end 9 and a closed base 10 connected by a surrounding wall 11, so that the first shell 5 and the second shell 6 are both cup-shaped.

In one embodiment, the inner and outer dimensions of the first casing 5 and the second casing 6 are exactly the same. As shown in Figures 4a, 4b, 5 and 6, the cross-sections of the first housing 5 and the second housing 6, and the magnetic exciter 1 may be circular, rectangular or square.

In another embodiment, the inner circumference of one of the first casing 5 and the second casing 6 substantially corresponds to the outer circumference of the other of the first casing 5 and the second casing 6, allowing the Movement occurs between the first housing 5 and the second housing 6 . In this embodiment, the first housing 5 and the second housing 6 may be arranged to partially overlap, as shown in FIGS. 7 and 8 .

The first housing 5 and the second housing 6 may include interconnecting flanges 12. When the magnet exciter 1 is located at the first execution end position P1 or the second execution end position P2 as shown in FIG. The flanges 12 are connected. The flanges of one housing extend inwardly in a direction towards the interior of the housing, while the flanges of the other housing extend outwardly in a direction outwards from the interior of the housing. Furthermore, said perimeter wall 11 of a housing whose inner circumference corresponds substantially to the outer perimeter of the other housing, for example, the perimeter wall 11 of a housing having a larger inner dimension, extends beyond the flange of another housing having a smaller inner dimension, so that all The flange of the casing with the smaller inner size is enclosed by the surrounding wall 11 and the flange 12 of the casing with the larger inner size. Therefore, the flanges overlap so that the first housing 5 and the second housing 6 cannot be separated.

The present invention also relates to an electronic device 2 , the part of which is shown in FIG. 3 , comprising a movable surface 13 , eg, a display screen; The magnet exciter 1 is disposed between the movable surface 13 and the equipment case 14 for moving the movable surface 13 relative to the equipment case 14 . Movement of the movable surface 13 generates vibrations within the electronic device 2, eg. sound waves. This achieves a so-called "whistling display". The rear cover is arranged at a position close to one side of the equipment case 14 , and the distance between the side of the equipment case 14 and the magnet exciter 1 is the farthest.

In one embodiment, the first housing 5 of the magnet exciter 1 is attached to the movable face 13 and the second housing 6 of the magnet exciter 1 is attached to the equipment housing 14 . In another embodiment, the second housing 6 of the magnet exciter 1 is attached to the movable face 13 and the first housing 5 of the magnet exciter 1 is attached to the equipment housing 14 .

The present invention also relates to an assembly for assembling the magnet exciter 1 , comprising the magnet exciter 1 and an assembly pin 15 .

The first housing 5 of the magnet exciter 1 includes a through slot 16 a for receiving the assembly pin 15 . The first end 15a of the assembly pin 15 is releasably connected to the inner surface 6a of the second housing 6 after passing through the through groove 16a. Said first end 15a can be inserted into a groove provided in said inner surface 6a and, for example, releasably connected by means of a thread. The second end 15b of the assembly pin 15 is releasably connected to the outer surface 5b of the first housing 5 to connect the first housing 5 and the second housing 6 to each other. During assembly, the magnet 4 and the coil 3 are kept at a predetermined distance from each other by the assembly pins 15 . The components of the magnet exciter can be glued together, during which time the assembly pins 15 keep all components in their correct position. Once the various components of the magnet exciter are fixedly interconnected by, for example, adhesive, they can be removed by removing the assembly pins 15 from the inner and outer surfaces 6a and 5b and by pulling the assembly pins 15 from the through slots 16a. Remove the assembly pins 15.

The assembly pins 15 may have any suitable shape. In one embodiment, the assembly pin 15 is T-shaped and inserted into the magnet exciter 1 such that when the through slot 16a receives the assembly pin 15, one of the assembly pins 15 The leg extends in the direction of the attractive force F generated by the magnetic field in the magnet exciter 1 and the other leg of the assembly pin 15 extends in a plane P perpendicular to the direction of the attractive force F.

In one embodiment, the magnet 4 and/or the spacer 8 includes a through slot 16b for accommodating the assembly pin 15 so that the leg of the assembly pin 15 extends in the direction of the attractive force F At least partially through the magnet 4 and/or the spacer 8 . In this configuration, the through slot 16 includes the through slot 16a and the through slot 16b.

Aspects and implementations are described herein in conjunction with various embodiments. However, those skilled in the art can understand and obtain other variations of the disclosed embodiments by practicing the subject matter, studying the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

The use of reference signs in the claims shall not be construed as limiting the scope.

Claims (18)

1. A magnet exciter (1) for an electronic device (2), characterized in that the magnet exciter (1) comprises: coil(3); a magnet (4); and A first casing (5) and a second casing (6), wherein the coil (3) is at least partially located in the first casing (5) and fixed on the first casing (5), the magnet (4) at least partially located in the second housing (6) and fixed on the second housing (6), wherein The first housing (5) includes a magnetic material; A magnetic field is generated by the magnet (4) and the first casing (5), and the magnetic field generates an attractive force between the magnet (4) and the first casing (5); the magnet (4) and the first housing (5) are in force equilibrium, wherein an air gap (7) is provided between the magnet (4) and the coil (3); and Operating the current in the coil (3) changes the attractive force so that displacement occurs between the magnet (4) and the first housing (5); The magnet exciter further comprises at least one gasket (8), the gasket (8) being compressible; the gasket (8) is located at least partially within the first housing (5) and is located in the within the area enclosed by the inner peripheral contour of the coil (3); the spacer (8) causes the magnet (4) and the first housing (5) to act as a reaction force to the force generated by the magnetic field. ) to maintain a state of force balance; The first housing (5) includes one through groove (16a) for accommodating an assembly pin (15), and the gasket (8) includes another through groove (16b) for accommodating the assembly pin (15) ), the assembly pin (15) is a component for assembling the magnet exciter. 2. The magnet exciter (1) according to claim 1, characterized in that, the spacer (8) is used for, when the magnet exciter (1) is in the first execution end position (P1), a first air gap (7a) is provided between the magnet (4) and the coil (3), and When the magnet exciter (1) is in the second actuating end position (P2), a second air gap (7a) smaller than the first air gap (7a) is provided between the magnet (4) and the coil (3). Air gap (7b). 3. The magnet exciter (1) according to claim 1, wherein the spacer (8) interconnects at least the first housing (5) and the second housing (6), and /or interconnecting the first housing (5) and the magnet (4). 4. The magnet exciter (1) according to claim 2, wherein the gasket (8) is fixed on the inner surface (5a) of the first housing (5); When the magnet exciter (1) is in the first execution end position (P1), the gasket (8) is in an uncompressed state; and When the magnet exciter (1) is in any position other than the first execution end position, including the second execution end position (P2), the gasket (8) is in a compressed state. 5. The magnet exciter (1) according to any one of claims 1 to 4, wherein the gasket (8) comprises a flexible washer (8a). 6. The magnet exciter (1) according to any one of claims 1 to 4, wherein the spacer (8) comprises a connection to the first housing (5) and the second housing The dust cover (8b) of (6), wherein the dust cover covers the gap between the first casing (5) and the second casing (6). 7. The magnet exciter (1) according to claim 5, characterized in that the gasket (8) comprises a dust-proof connection to the first housing (5) and the second housing (6) A cover (8b), wherein the dust cover covers the gap between the first casing (5) and the second casing (6). 8. The magnet exciter (1) according to claim 7, wherein the gasket (8) comprises the flexible gasket (8a) and the dust cover (8b). 9. The magnet exciter (1) according to any one of claims 1 to 4, characterized in that the first housing (5) and the second housing (6) guide the magnetic field to the the space in at least one of the first shell (5) and the second shell (6). 10. The magnet exciter (1) according to claim 2 or 4, characterized in that the first housing (5) and the second housing (6) have open ends (9) and are separated by a wall (11) ) connected closed base (10); The inner circumference of one of the first casing (5) and the second casing (6) substantially corresponds to the outer circumference of the other of the first casing (5) and the second casing (6), allowing all Movement occurs between the first casing (5) and the second casing (6). 11. The magnet exciter (1) according to claim 10, characterized in that the first casing (5) and the second casing (6) partially overlap. 12. The magnet exciter (1) according to claim 11, wherein the first housing (5) and the second housing (6) comprise interconnecting flanges (12), when the magnet When the exciter (1) is located at the first execution end position (P1) or the second execution end position (P2), the flanges (12) are connected. 13. The magnet exciter (1) according to claim 1 or 3, characterized in that the first housing (5) and the second housing (6) have open ends (9) and are surrounded by walls (11) ) connected closed base (10); The inner circumference of one of the first casing (5) and the second casing (6) substantially corresponds to the outer circumference of the other of the first casing (5) and the second casing (6), allowing all Movement occurs between the first casing (5) and the second casing (6). 14. An electronic device (2), characterized in that it comprises: removable face (13), equipment enclosure (14), and The magnet exciter (1) according to any one of claims 1 to 13, arranged between the movable surface (13) and the equipment case (14), for relative to the equipment case (14) Move the movable surface (13). 15. Electronic device (2) according to claim 14, characterized in that the first housing (5) of the magnet exciter (1) is attached to the movable face (13), and the magnet The second housing (6) of the exciter (1) is attached to the equipment housing (14), or the second housing (6) of the magnet exciter (1) is attached to the movable face (13) , and the first housing (5) of the magnet exciter (1) is attached to the equipment enclosure (14). 16. The electronic device (2) according to claim 14 or 15, characterized in that the movement of the movable surface (13) generates vibrations within the electronic device (2). 17. An assembly for assembling a magnet exciter, comprising: A magnet exciter (1) according to any one of claims 1 to 13; and assembly pin (15), where The first housing (5) of the magnet exciter (1) comprises a through slot (16a) for receiving the assembly pin (15); the first end (15a) of the assembly pin (15) is releasably connected to the inner surface (6a) of the second housing (6) after passing through the through slot (16); and The second end (15b) of the assembly pin (15) is releasably connected to the outer surface (5b) of the first housing (5) such that The first housing (5) and the second housing (6) are connected to each other, and the magnet (4) and the coil (3) are kept at a predetermined distance from each other by the assembling pin (15); The washer (8) of the magnet exciter (1) includes another through slot (16b) for receiving the assembly pin (15). 18. Assembly according to claim 17, characterized in that the assembly pin (15) is T-shaped, when the through slot (16) receives the assembly pin (15) One leg of (15) extends in the direction of the attractive force created by the magnetic field within said magnet exciter (1); and One leg of the assembly pin (15) extends in a plane perpendicular to the direction of the attractive force.

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