CN216721561U

CN216721561U - Magnetic circuit assembly and vibration device

Info

Publication number: CN216721561U
Application number: CN202122970186.1U
Authority: CN
Inventors: 陈娟; 沈佳龙
Original assignee: Suzhou Suoye Electronic Technology Co ltd
Current assignee: Suzhou Suoye Electronic Technology Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-06-10
Anticipated expiration: 2031-11-30

Abstract

The utility model discloses a magnetic circuit assembly and a vibration device, wherein the vibration device comprises: the magnetic steel structure comprises a plurality of magnetic steels (1), wherein the magnetic steels (1) are arranged along an axis A, and two adjacent magnetic steels (1) are oppositely arranged in the same pole; the pole core (2) is bonded between two adjacent magnetic steels (1); wherein, first terminal surface (20) of utmost point core (2) with second terminal surface (10) adhesion of magnet steel (1), the area of first terminal surface (20) with the proportional range of the area of second terminal surface (10) is 60% ~ 100%, the volume of utmost point core (2) with the specific range of the volume of magnet steel (1) is 0.1 ~ 0.8, the thickness scope of utmost point core (2) is 0.2mm ~ 5 mm. The magnetic steel of the magnetic circuit component is connected with the pole core more firmly, is not easy to disintegrate and is more reliable to use.

Description

Magnetic circuit assembly and vibration device

Technical Field

The utility model relates to the technical field of vibration, in particular to a magnetic circuit assembly and a vibration device.

Background

Vibration devices, such as linear vibration motors and vibration sound-generating devices, generally include a magnetic circuit assembly and a coil. The magnetic circuit component comprises magnetic steel, the coil is sleeved outside the magnetic steel, and the magnetic circuit component is driven to vibrate along the vibration axis by a magnetic field which changes when the coil is electrified.

In order to improve magnetic circuit assembly and respond to the vibrational force in coil magnetic field, magnetic circuit assembly often includes the relative magnet steel that sets up of a plurality of homopolarities, it has the utmost point core to bond between two adjacent magnet steels, because two adjacent magnet steels are the relative setting of homopolarity, therefore, if the unreasonable of the structure setting of utmost point core, will make to have great repulsion between two adjacent magnets, can lead to magnetic circuit assembly to disintegrate after the long-time effect, the constraint disconnection of glue breaks away between utmost point core and the magnet steel promptly, thereby lead to whole vibration system to lose the function. If the magnetic circuit assembly is assembled in the linear vibration motor, the motor will fail, and the bad phenomena of impact, noise, no vibration, etc. will occur.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a magnetic circuit component and a vibration device, wherein the magnetic circuit component is not easy to be disassembled due to the repulsive force between two adjacent magnetic steels.

To achieve the above object, in one aspect, the present invention provides a magnetic circuit assembly, including:

the magnetic steels are arranged along an axis A, and the homopolar poles of two adjacent magnetic steels are opposite; and the number of the first and second groups,

the pole core is bonded between two adjacent magnetic steels;

the magnetic steel pole piece comprises a magnetic steel, a first end face and a second end face, wherein the first end face of the pole piece is adhered to the second end face of the magnetic steel, the ratio of the area of the first end face to the area of the second end face ranges from 60% to 100%, the ratio of the volume of the pole piece to the volume of the magnetic steel ranges from 0.1mm to 0.8, and the thickness of the pole piece ranges from 0.2mm to 5 mm.

Further, the ratio of the volume of the pole core to the volume of the magnetic steel ranges from 0.3 to 0.6.

Further, the ratio of the area of the first end face to the area of the second end face ranges from 85% to 95%, and the thickness of the pole core ranges from 1mm to 2.5 mm.

Further, the second peripheral face of magnet steel surpasss the first peripheral face of pole piece.

Furthermore, the range of the distance L between the first peripheral surface of the pole core and the second peripheral surface of the magnetic steel is more than 0 and less than or equal to 1 mm.

Furthermore, a glue groove is formed in the first end face of the pole core and/or the second end face of the magnetic steel, and the area of the glue groove accounts for 5% -90% of the area of the first end face.

Further, the proportion range of the area of the glue groove in the area of the first end face is 25% -65%.

Furthermore, the depth range of the glue groove is 0.005-0.15 mm.

Furthermore, the first end face of the pole core and/or the second end face of the magnetic steel are/is provided with a rectangular glue groove and/or a circular glue groove and/or an annular glue groove and/or a plurality of glue grooves arranged in an array.

In another aspect, the utility model provides a vibration device comprising a magnetic circuit assembly as described in any one of the above.

Compared with the prior art, the utility model has the following beneficial effects:

1. the proportion scope of the area through the first terminal surface with the utmost point core and the second terminal surface of magnet steel sets up to 60% ~ 100%, the ratio scope of the volume with the utmost point core and the volume of magnet steel sets up to 0.1 ~ 0.8, the thickness scope with the utmost point core sets up to 0.2mm ~ 5mm, make repulsion between the adjacent magnet steel subduct, the suction between final magnet steel and the utmost point core is greater than the repulsion between adjacent magnet steel and the magnet steel, connect through suction and adhesive force, magnetic circuit assembly is whole more firm, be difficult for the disintegration, the effectual life and the service reliability that have improved magnetic circuit assembly itself and applied magnetic circuit assembly's vibrating device or other electronic equipment.

2. The glue groove is formed in the first end face of the pole core and/or the second end face of the magnetic steel, so that the glue groove can increase the capacity of glue, the connection between the magnetic steel and the pole core is firmer, the disassembly risk of the magnetic circuit assembly is further reduced, and the service life and the service reliability of the magnetic circuit assembly are improved.

Drawings

Fig. 1 is a schematic structural view of a magnetic circuit assembly according to an embodiment of the present invention.

Fig. 2 is a front view of the magnetic circuit assembly shown in fig. 1.

Fig. 3 is a schematic view of the magnetic circuit assembly shown in fig. 2 inserted into the coil.

Fig. 4 is a schematic structural view of a magnetic circuit assembly according to an embodiment of the present invention, in which the magnetic steel and the pole core are circular in cross section.

Fig. 5 is a cross-sectional view in the direction of view C-C in fig. 2.

Fig. 6 is a schematic structural view of a pole piece according to an embodiment of the present invention, in which a glue groove is rectangular.

Fig. 7 is a schematic structural view of a pole piece according to an embodiment of the present invention, in which a glue groove is circular.

Fig. 8 is a schematic structural view of a pole piece according to an embodiment of the present invention, showing a plurality of annular glue grooves.

Fig. 9 is a schematic structural diagram of a pole piece according to an embodiment of the present invention, in which a plurality of glue grooves are distributed in an array.

Fig. 10 is a schematic structural diagram of a magnetic circuit assembly according to an embodiment of the present invention, in which the number of magnetic steels is four.

Fig. 11 is a front view of the magnetic circuit assembly shown in fig. 10.

Fig. 12 is a diagram showing a simulation of the distribution of magnetic induction lines of a magnetic circuit assembly according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in fig. 1 and 2, a magnetic circuit assembly according to a preferred embodiment of the present invention includes a plurality of magnetic steels 1 and a pole piece 2 disposed between two adjacent magnetic steels 1.

A plurality of magnet steel 1 arrange the setting along axis A, and pole core 2 then bonds between two adjacent magnet steel 1 through sticky mode, and two adjacent magnet steel 1 homopolarity set up relatively, for example N extremely sets up relatively or S extremely sets up relatively. The pole core 2 is made of a highly magnetic conductive material, and is made of one or a combination of several steel materials of japanese standard (JIS) grades SPCC, SPCD, and SPCE, for example. In this way, the magnetic induction lines of two adjacent magnetic steels 1 will be diverged outwards under the guidance of the pole core 2, and the magnetic induction lines are approximately perpendicular to the axis a, referring to fig. 3, when the coil 3 is arranged on the outer periphery of the pole core 2, the magnetic induction lines can be made to pass through the coil more intensively, and pass through the coil 3 approximately along the radial direction of the coil 3, and a larger driving force can be generated to drive the magnetic circuit assembly to vibrate.

Specifically, referring to fig. 2, two ends of the pole core 2 are provided with first end faces 20, the magnetic steel 1 is provided with a second end face 10, and the pole core 2 and the magnetic steel 1 are connected into a whole through the first end faces 20 and the second end face 10 in an adhesion manner. The ratio of the area of the first end face 20 (the area indicated by the cross-sectional line in fig. 5) to the area of the second end face 10 (the area surrounded by the outermost solid line frame in fig. 5) is 60% to 100%, for example, 60%, 70%, 80%, 90%, or 100%, the ratio of the volume of the pole piece 2 to the volume of the magnetic steel 1 is 0.1 to 0.8, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8, the thickness of the pole piece 2 is 0.2mm to 5mm, for example, the thickness is selected to be 0.2mm, 1mm, 2mm, 3mm, 4mm, or 5 mm. The numbers A to B in this specification include the numbers A and B.

It can be understood that, the larger the thickness of the pole core 2 is, the farther the two magnetic steels 1 are apart from each other, the smaller the repulsive force between the two magnetic steels 1 is, and meanwhile, the larger the volume of the pole core 2 is, the more obvious the guiding and steering effect on the magnetic induction lines is. The proportion range of the area of the first end face 20 and the area of the second end face 10 is limited to 60% -100%, the ratio range of the volume of the pole core 2 and the volume of the magnetic steel 1 is limited to 0.1-0.8, the thickness range of the pole core 2 is limited to 0.2-5 mm, the repulsive force between two adjacent magnetic steels 1 can be effectively reduced, the attractive force between the magnetic steel 1 and the pole core 2 is equal to or even larger than the repulsive force, and therefore the magnetic circuit assembly can be kept stable through the bonding force and/or the attractive force, is not prone to being disassembled due to the existence of the repulsive force, and is more stable and reliable in use.

Further, the ratio of the volume of the pole core 2 to the volume of the magnetic steel 1 is within a range of 0.3-0.6. Since the sectional area of the pole core 2 is determined, the volume of the pole core 2 determines the thickness of the pole core, and the thinner the pole core 2 is, the closer the distance between the two magnetic steels 1 is, the larger the repulsive force is, and the thicker the pole core 2 is, although the better the guiding effect on the magnetic induction lines is, limited by the overall volume of the magnetic circuit assembly, the larger the volume of the pole core 2 is, the smaller the volume of the magnetic steel 1 is, which results in the reduction of the driving force generated by the coil 3. The ratio range of the volume of the pole core 2 to the volume of the magnetic steel 1 is set to be any value between 0.3 and 0.6, so that the influence on the driving force generated by the coil 3 can be reduced under the condition of greatly eliminating the repulsive force. In a preferred embodiment, the ratio of the volume of the pole core 2 to the volume of the magnetic steel 1 is 0.43, the ratio of the area of the first end face 20 to the area of the second end face 10 of the magnetic steel 1 is 87%, and the thickness of the pole core 2 is 1.2 mm.

Further preferably, the proportion range of the area of the first end face 20 to the area of the second end face 10 is 85% -95%, the thickness range of the pole core 2 is 1.0-2.5 mm, the larger the proportion of the area of the first end face 20 to the area of the second end face 10 is, the larger the thickness of the pole core 2 is, the smaller the area of the two adjacent magnetic steels 1 directly opposite to each other can be made, the distance is further, and the repulsion between the two magnetic steels 1 can be reduced.

It should be noted that the volumes of the magnetic steels 1 are not necessarily the same, and the volumes of the pole cores 2 are not necessarily the same, and it is only necessary that the volume ratio of the pole core 2 to the magnetic steel 1 connected thereto is within the above range; in addition, the volume ratio of the pole core 2 to the different magnetic steels 1 connected to it is not necessarily the same, for example, taking the magnetic circuit assembly shown in fig. 2 as an example, the volume ratio of the pole core 2 to the magnetic steel 1 on the left side thereof may be 0.4, and the volume ratio to the magnetic steel 1 on the right side thereof may be 0.5.

The cross-sectional shapes of the magnetic steel 1 and the pole core 2 are not limited, and may be, for example, circular, rectangular, square, triangular, and the like. Preferably, the magnetic steel 1 and the pole core 2 are circular or regular polygon, and the axis a coincides with the axis of the magnetic steel 1. Further preferably, the cross-sectional shapes of the magnetic steel 1 and the pole core 2 are the same, that is, when the cross-sectional shape of the magnetic steel 1 is circular, the cross-sectional shape of the pole core 2 is also circular, so that the pole core 2 can better guide the magnetic induction lines to be dispersed outwards. Fig. 1 and 2 show the case where the magnetic steel 1 and the pole core 2 are both square, and fig. 4 shows the case where the magnetic steel 1 and the pole core 2 are both circular.

The pole core 2 has a first peripheral surface 21 connected between its two first end surfaces 20, and the magnetic steel 1 has a second peripheral surface 11 connected between its two second end surfaces 10. Preferably, the shape and size of the two first end faces 20 of the pole core 2 are the same, and the shape and size of the two second end faces 10 of the magnetic steel 1 are also the same.

Further, in order to ensure the dimensional accuracy of the magnetic circuit assembly, the proportion of the area of the first end face 20 of the pole core 2 to the area of the second end face 10 of the magnetic steel 1 is less than 100%, and the second outer peripheral face 11 of the magnetic steel 1 is disposed beyond the first outer peripheral face 21 of the pole core 2, i.e., the projection of the first outer peripheral face 21 along the axis a direction will be located in the second outer peripheral face 11. When the shape and the size of first outer peripheral face 20 of utmost point core 2 and the second terminal surface 10 of magnet steel 1 are the same, easily lead to the size to exceed standard because of the dislocation after both assemble, influence magnetic circuit assembly's size precision and with coil 3's assembly precision, be unfavorable for magnetic circuit assembly's smooth and easy vibration, consequently, the area of the first terminal surface 20 with utmost point core 2 sets the proportion that accounts for magnet steel 1's second terminal surface 10 to be less than 100%, can be so that during the assembly, the first outer peripheral face 21 of better assurance utmost point core 2 does not surpass magnet steel 1's second outer peripheral face 11, the magnetic circuit assembly's that the equipment was accomplished size precision is higher.

In a preferred embodiment, the distance L between the first outer circumferential surface 21 of the pole core 2 and the second outer circumferential surface 11 of the magnetic steel 1 has a value in a range of: 0 < L.ltoreq.1 mm, for example L is 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, preferably the distance L is 0.215 mm.

In order to make the connection between pole core 2 and magnet steel 1 more firm, refer to fig. 6, gluey groove 22 has been seted up to first terminal surface 20 of pole core 2 and/or the second terminal surface 10 of magnet steel 1, when connecting, first terminal surface 20 of pole core 2 includes that its gluey groove 22 all coats and has glued, can save more glue in the gluey groove 22 for pole core 2 is more firm after connecting with magnet steel 1, has further reduced the risk that magnetic circuit assembly disintegrated. The ratio of the area of the glue groove 22 to the area of the first end surface 20 is preferably in the range of 5% to 90%, and if the ratio is too low, the effect of improving the connection strength is not significant, and if the ratio is too large, the magnetic conductive effect of the pole core 2 is easily affected. More preferably, the ratio of the area of the glue groove 22 to the area of the first end surface 20 is preferably in the range of 25% to 65%, which can improve the connection strength and ensure the magnetic conduction effect of the pole core 2. More preferably, the ratio of the area of the glue groove 22 to the area of the first end surface 20 is 37%.

Preferably, the depth of the glue groove 22 is 0.005 to 0.15mm, and more preferably, the depth of the glue groove 22 is 0.01 to 0.08 mm.

The shape of the glue groove 22 is not limited, and the glue groove 22 is opened on the first end surface 20 as an example, in the first preferred embodiment, the shape of the glue groove 22 is identical to the shape of the first end surface 20, and referring to fig. 6, in fig. 6, the shape of the glue groove 22 is rectangular, and the outer periphery thereof is preferably equidistant from the first outer peripheral surface 21. In a second preferred embodiment, and with reference to fig. 7, the first end surface 20 is square in shape and the glue groove 22 is circular. In a third preferred embodiment, with reference to fig. 8, the glue groove 22 is annular, and the number of glue grooves 22 is shown to be plural, but it may be one. In a fourth preferred embodiment, referring to fig. 9, there are a plurality of glue grooves 22, and a plurality of glue grooves 22 are distributed on the first end face 20 in an array. In other embodiments, one or more glue grooves 22 may be formed on the first end surface 20. It is understood that, in the case that the number of the glue grooves 22 is plural, the ratio of the area of the glue groove 22 to the area of the first end surface 20 refers to the ratio of the area of all the glue grooves 22 to the area of the first end surface 20.

The glue groove 22 can be opened on the magnetic steel 1, and also can be opened on the pole core 2, preferably, the glue groove 22 is opened on the pole core 2. Note that, in the case where the glue groove 22 is provided on the first end face 20 and the second end face 10, the area of the first end face 20 and the area of the second end face 10 both include the area of the glue groove 22.

It is to be understood that, although fig. 1 to 4 each show the case of two magnetic steels 1 and one pole core 2, the number of the magnetic steels 1 and the pole cores 2 is not limited thereto, and for example, referring to fig. 10 and 11, the number of the magnetic steels 1 is four, and the number of the pole cores 2 is three accordingly. The outermost end of the magnetic circuit component is not necessarily the magnetic steel 1, but may be the pole core 2.

Referring to fig. 12, fig. 12 shows a distribution simulation diagram of magnetic induction lines of a magnetic circuit assembly according to an embodiment, and it can be seen from the diagram that after the magnetic induction lines of the magnetic steel 1 are guided by the pole core 2, the magnetic induction lines of the magnetic steel 1 entering the opposite side are not substantially present, so that the repulsive force between two adjacent magnetic steels 1 is substantially eliminated, the magnetic steel 1 is more firmly connected under the action of the adhesive force and the attractive force between the magnetic steel 1 and the pole core 2, and the disassembly prevention of the magnetic circuit assembly is facilitated.

The utility model also proposes a vibration device comprising a magnetic circuit assembly as described above. The vibrating device can be a linear vibrating motor or a vibrating sound-producing device, the vibrating sound-producing device can be a loudspeaker, a bone conduction sound-producing device and the like, and the magnetic steel 1 of the magnetic circuit component is connected with the pole core 2 more firmly, so that the magnetic circuit component is not easy to disintegrate due to vibration, the vibrating device has longer service life, and the reliability is higher. In addition, the size precision of the magnetic circuit component is easier to guarantee, the assembly of the magnetic circuit component and the coil can be more compact, the assembly error is more controllable, and the driving force of the coil on the magnetic circuit component is favorably improved.

The utility model has the following advantages:

The above is only one embodiment of the present invention, and any other modifications based on the concept of the present invention are considered as the protection scope of the present invention.

Claims

1. A magnetic circuit assembly, comprising:

the magnetic steel structure comprises a plurality of magnetic steels (1), wherein the magnetic steels (1) are arranged along an axis A, and two adjacent magnetic steels (1) are oppositely arranged in the same pole; and the number of the first and second groups,

the pole core (2) is bonded between two adjacent magnetic steels (1);

wherein, first terminal surface (20) of utmost point core (2) with second terminal surface (10) adhesion of magnet steel (1), the area of first terminal surface (20) with the proportional range of the area of second terminal surface (10) is 60% ~ 100%, the volume of utmost point core (2) with the specific range of the volume of magnet steel (1) is 0.1 ~ 0.8, the thickness scope of utmost point core (2) is 0.2mm ~ 5 mm.

2. The magnetic circuit assembly according to claim 1, wherein a ratio of a volume of the pole piece (2) to a volume of the magnetic steel (1) is in a range of 0.3 to 0.6.

3. The magnetic circuit assembly according to claim 2, wherein the ratio of the area of the first end face (20) to the area of the second end face (10) is in the range of 85% to 95%, and the thickness of the pole core (2) is in the range of 1 to 2.5 mm.

4. A magnetic circuit assembly according to claim 1, characterized in that the second peripheral surface (11) of the magnetic steel (1) exceeds the first peripheral surface (21) of the pole piece (2).

5. A magnetic circuit assembly according to claim 4, characterized in that the distance L between the first peripheral surface (21) of the pole piece (2) and the second peripheral surface (11) of the magnetic steel (1) ranges from 0 < L < 1 mm.

6. The magnetic circuit assembly according to claim 1, wherein the first end face (20) of the pole core (2) and/or the second end face (10) of the magnetic steel (1) is provided with a glue groove (22), and the glue groove (22) has an area occupying the area of the first end face (20) in a proportion range of 5% to 90%.

7. A magnetic circuit assembly according to claim 6, characterized in that the glue groove (22) has an area that is in a proportion ranging from 25% to 65% of the area of the first end face (20).

8. A magnetic circuit assembly according to claim 6, wherein the depth of the glue groove (22) is in the range of 0.005-0.15 mm.

9. The magnetic circuit assembly according to claim 6, wherein the first end face (20) of the pole core (2) and/or the second end face (10) of the magnetic steel (1) is provided with a rectangular glue groove (22) and/or a circular glue groove (22) and/or an annular glue groove (22) and/or a plurality of glue grooves (22) arranged in an array.

10. A vibration device comprising a magnetic circuit assembly as claimed in any one of claims 1 to 9.