Linear motor

Abstract

The utility model discloses a linear motor. The linear motor comprises a main support, a first elastic member, an oscillator assembly and a stator assembly. The main support comprises an inner cavity and is provided with a first opening end. The first elastic piece is arranged at the first opening end; the vibrator assembly comprises a magnetic conductive sheet; the stator assembly and the main support are relatively fixed. The linear motor provided by the utility model is provided with two groups of magnetic circuit assemblies located at the two sides of the stator assembly, so that the magnetic flux passing through the stator assembly can be improved, and meanwhile, the inner magnetic circuit assembly and the outer magnetic circuit assembly are magnetized reversely, so that magnetic induction lines are closed, and the magnetic flux passing through the stator assembly is further improved, so that the magnetic performance of a system is improved; the bone conduction device can be applied to the field of bone conduction.

Description

[0001] Priority information: This application claims priority to Chinese Patent Application No. 202311242148.1 filed on September 25, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The utility model relates to the technical field of motors, and in particular to a linear motor which can be applied to the field of bone conduction. Background Art

[0003] With the rapid development of portable intelligent electronic products, tactile experience has gradually entered the field of vision of consumers; for example, smart phones, game controllers, game consoles, multimedia entertainment devices, wearable electronic devices, medical and health equipment, etc. These electronic products generally use vibration motors for system feedback, and linear motors are gradually emerging. However, the magnetic utilization efficiency of general linear motors is low. They use counterweights to improve the response effect near the natural frequency, resulting in a narrow effective vibration frequency response range, poor response to high-frequency signals, and poor vibration effects at high frequencies. As linear motors are used more and more widely and in more application scenarios, the market now prefers motors with larger bandwidths.

[0004] Existing linear motors are generally divided into two major components: the stator and the vibrator. The stator is fixed in contact with the whole machine, and the vibrator is the main vibrating component, which transmits the vibration to the stator through the spring. The driving force is the electromagnetic interaction, and the Ampere force generated by the permanent magnet and the energized coil converts the electrical energy into mechanical energy of linear motion. This structure will produce a stable vibration effect in a specific direction when driven by an electrical signal, and can adjust the amplitude, frequency and other effects according to the signal. Compared with the traditional rotor motor, it has a simple structure, no additional devices, fast response speed, low noise, long service life, and more stable operation.

[0005] Conventional linear motors include coils, permanent magnets, magnetic pole pieces / magnetic bowls, brackets and other components; the magnetic properties are achieved by using permanent magnet poles to collide with each other and magnetic pole pieces to allow more magnetic fields to pass through the coils. However, existing linear vibration motors have low magnetic properties, and the vibration response is only good in the frequency range near the natural frequency of the system, while the response to higher frequency signals is weak, and the frequency response band of the system is narrow. Figure 1 As shown, Figure 1 It is a frequency response curve diagram of a conventional linear motor of an embodiment. It can be seen from the figure that the G value response is large near the natural frequency of the system, and when the frequency is higher, the response G value is weak, resulting in poor vibration feeling in the middle and high frequencies. Utility Model Content

[0006] The utility model aims to provide a linear motor which can improve the medium and high frequency vibration response.

[0007] In order to achieve the above-mentioned utility model object, the utility model proposes a linear motor, comprising

[0008] A main stent, comprising an inner cavity, wherein the main stent is provided with a first open end;

[0009] A first elastic member, disposed at the first opening end;

[0010] a vibrator assembly, disposed inside the inner cavity and connected to the first elastic member, the vibrator assembly comprising a magnetic conductive sheet; and

[0011] The stator assembly is fixed relative to the main bracket.

[0012] Furthermore, the vibrator assembly also includes an inner magnetic circuit assembly and an outer magnetic circuit assembly, at least one end of the inner magnetic circuit assembly and the outer magnetic circuit assembly is connected to the magnetic conductive sheet, the outer magnetic circuit assembly surrounds the outside of the inner magnetic circuit assembly, and the two are relatively spaced apart to form an annular magnetic gap; the stator assembly includes a coil, at least part of the coil is located in the annular magnetic gap.

[0013] Furthermore, the inner magnetic circuit component includes a first magnet and a first magnetic conductive plate connected to the first magnet, the outer magnetic circuit component includes a second magnet surrounding the outside of the first magnet and a second magnetic conductive plate connected to the second magnet, the second magnetic conductive plate surrounds the outside of the first magnetic conductive plate, and the coil surrounds the outer circumference of the first magnetic conductive plate and is located between the first magnetic conductive plate and the second magnetic conductive plate.

[0014] Furthermore, both the first magnet and the second magnet are magnetized along the vibration direction, and the polarities of two magnetic poles of the first magnet and the second magnet that are arranged opposite to each other are opposite.

[0015] Further, the inner magnetic circuit component includes at least two first magnets, two adjacent first magnets are connected by the first magnetic conductive plate, and are arranged opposite to each other with the same poles along the vibration direction; the outer magnetic circuit component includes at least two second magnets, two adjacent second magnets are connected by the second magnetic conductive plate, and are arranged opposite to each other with the same poles along the vibration direction;

[0016] The thickness of the first magnet and the second magnet are both greater than the thickness of the first magnetic conductive plate and the second magnetic conductive plate;

[0017] The first magnetic conductive plate and the second magnetic conductive plate have the same thickness.

[0018] Furthermore, the first magnets and the second magnets are of the same number and thickness; each of the second magnets is correspondingly surrounded by the outside of one of the magnets;

[0019] The coil surrounds the outer periphery of at least one of the first magnetic conductive plates. When the vibrator assembly is in the original position, two ends of the coil extend beyond two ends of the first magnetic conductive plate.

[0020] Further, only one of the first magnetic conductive plates is surrounded by the coil; or,

[0021] A coil is surrounded on the outer periphery of each of the first magnetic conductive plates, and the current directions in two adjacent coils are opposite at the same time.

[0022] Furthermore, it also includes a magnetic conductive ring connected to the magnetic conductive sheet, the magnetic conductive ring and the magnetic conductive sheet are integrally formed and surround the outside of the external magnetic circuit component;

[0023] The magnetic conductive ring is in contact with the outer surface of the outer magnetic circuit component, or is arranged with a relative spacing from the outer surface of the outer magnetic circuit component.

[0024] Furthermore, the first elastic member includes an outer frame, an inner frame and an elastic arm, the inner frame is arranged in the outer frame, and the elastic arm is connected between the outer frame and the inner frame; the main bracket is connected to the outer frame, the vibrator assembly is directly connected to the inner frame, or the vibrator assembly and the inner frame are connected via a gasket.

[0025] Furthermore, one end of the main bracket is open, and the other end is provided with a bottom plate, and the stator assembly includes a coil bracket, and the coil bracket is connected between the bottom plate and the coil.

[0026] Further, it also includes a second elastic member, the second elastic member is connected to the vibrator assembly, the main bracket is provided with a second open end, the first open end and the second open end are respectively located at two ends of the main bracket, the first elastic member and the second elastic member are respectively provided at the first open end and the second open end, and the two are respectively connected to two ends of the vibrator assembly;

[0027] The two ends of the inner magnetic circuit component and the outer magnetic circuit component are both connected with a magnetic conductive sheet.

[0028] Furthermore, it also includes an end cover, and the end cover seals the first opening end and the second opening end.

[0029] Furthermore, the stator assembly also includes a coil bracket, which is connected to the coil. The coil bracket includes a connecting portion, and the connecting portion passes through the magnetic conductive sheet and the first elastic member or the second elastic member to be connected to the main bracket and / or the end cover.

[0030] Compared with the prior art, the present invention has the following advantages: according to the linear motor of at least one embodiment of the present invention, its vibrator assembly is provided with an inner magnetic circuit assembly and an outer magnetic circuit assembly connected by a magnetic conductive member, the inner magnetic circuit assembly and the outer magnetic circuit assembly cooperate to form an annular magnetic gap, and the coil is at least partially located in the annular magnetic gap. By arranging two groups of magnetic circuit assemblies located on both sides of the stator assembly, the magnetic flux passing through the stator assembly can be increased, the magnetic performance of the system can be improved, and the high-frequency vibration response of the linear motor can be better. The linear motor can be applied to the field of bone conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes and are used to help understand the present invention. They do not specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances. In the drawings:

[0032] Figure 1 is a frequency response curve diagram of a linear motor in the prior art;

[0033] Figure 2 It is a structural schematic diagram of a linear motor in one embodiment of the utility model;

[0034] Figure 3 yes Figure 2 A schematic diagram of the structure after the upper end cover in the structure shown explodes;

[0035] Figure 4 is a cross-sectional view of the linear motor in the first embodiment of the utility model;

[0036] Figure 5 It is a distribution diagram of magnetic flux lines of the inner magnetic circuit component and the outer magnetic circuit component of the linear motor in the first embodiment of the utility model;

[0037] Figure 6 This is a comparison diagram of frequency response curves of a linear motor in an embodiment of the utility model and a conventional linear motor;

[0038] Figure 7 is a cross-sectional view of the linear motor in the second embodiment of the present utility model;

[0039] Figure 8 It is a structural schematic diagram of the main bracket, the first elastic member, the vibrator assembly and the stator assembly in the third embodiment of the present utility model;

[0040] Fig. 9 yes Figure 8 A schematic diagram of the assembly of the structure shown;

[0041] Fig.10 It is a cross-sectional view of the main bracket, the first elastic member, the vibrator assembly and the stator assembly in the third embodiment of the present utility model;

[0042] Fig.11 It is a structural schematic diagram of the first elastic member, the vibrator assembly and the stator assembly in the fourth embodiment of the utility model;

[0043] Fig.12 yes Fig.11 a cross-sectional view of the structure shown;

[0044] Fig.13 It is a structural schematic diagram of the first elastic member, the vibrator assembly and the stator assembly in the fifth embodiment of the utility model;

[0045] Fig.14 yes Fig.13 A cross-sectional view of the structure shown.

[0046] Fig.15 It is a cross-sectional view of the linear motor in the sixth embodiment of the present utility model. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0048] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0050] like Figures 2 to 4As shown, the utility model proposes a linear motor, including a main bracket 1, a first elastic member 2, a vibrator assembly 3 and a stator assembly 4.

[0051] The main stent 1 includes an inner cavity 101 . The main stent 1 is provided with a first open end 102 . The main stent 1 may be an annular structure with one end open or both ends open.

[0052] The first elastic member 2 is disposed at the first opening end 102 , and may be located at an end surface of the first opening end 102 , or may be located inside the first opening end 102 and close to the end surface of the first opening end 102 .

[0053] The vibrator assembly 3 is arranged inside the inner cavity 101 and connected to the first elastic member 2. The vibrator assembly 3 includes a magnetic conductive member and an inner magnetic circuit assembly 301 and an outer magnetic circuit assembly 302 connected to the magnetic conductive member. The magnetic conductive member includes a plate-shaped magnetic conductive sheet 304. At least one end of the inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302 is connected to the magnetic conductive sheet 304 to improve the magnetic conductive efficiency. The outer magnetic circuit assembly 302 is annular and surrounds the outside of the inner magnetic circuit assembly 301. The inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302 cooperate to form an annular magnetic gap 303.

[0054] The stator assembly 4 includes a coil 402 fixed relative to the main support 1 . The coil 402 is at least partially located in the annular magnetic gap 303 . The stator assembly 4 drives the vibrator assembly 3 to vibrate.

[0055] The vibrator assembly 3 is provided with an inner magnetic circuit assembly 301 and an outer magnetic circuit assembly 302 connected by a magnetic conductive member. The inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302 cooperate to form an annular magnetic gap 303. The coil 402 is at least partially located in the annular magnetic gap 303. The inner magnetic circuit assembly 301 is located on the inner side of at least part of the stator assembly 4, and the outer magnetic circuit assembly 302 is located on the outer side of at least part of the stator assembly. By arranging two groups of magnetic circuit assemblies located on the inner and outer sides of the coil 402, the magnetic flux passing through the stator assembly 4 can be increased, thereby improving the magnetic performance of the system and improving the medium and high frequency vibration response.

[0056] As a preferred embodiment, the inner magnetic circuit component 301 includes at least one first magnet 3011, and the outer magnetic circuit component 302 includes at least one second magnet 3021. At least one first magnet 3011 is surrounded by a second magnet 3021. The first magnet 3011 and the second magnet 3021 are magnetized along the vibration direction A, and the magnetization directions are opposite, so that the polarities of the two relatively arranged magnetic poles of the first magnet 3011 and the second magnet 3021 are opposite. The magnetic flux lines are closed by reverse magnetization of the inner magnetic circuit component 301 and the outer magnetic circuit component 302. At the same time, the magnetic flux passing through the stator component 4 is further increased to improve the magnetic performance of the system, thereby achieving the purpose of improving the medium and high frequency vibration response and reducing power consumption.

[0057] Since the polarities of the two magnetic poles of the first magnet 3011 and the second magnet 3021 are opposite, the magnetic flux lines derived from the inner magnetic circuit component 301 and the outer magnetic circuit component 302 are just opposite, so that the magnetization directions between the two are opposite, the magnetic flux lines are closed, and a closed magnetic field can be formed. The coil 402 of the stator component 4 is between the two magnetic fields, so that the magnetic flux passing through the coil 402 of the stator component 4 is significantly increased, and the magnetic performance of the system is better. Figure 4 As shown, Figure 4 Shows Figure 3 In the structure shown, the magnetic flux distribution diagram of the inner magnetic circuit component 301 and the outer magnetic circuit component 302 can significantly increase the magnetic flux passing through the coil 402 of the stator component 4 because a closed magnetic field is formed.

[0058] The stator assembly 4 includes at least one coil 402, and the coil 402 is fixedly connected to the main support 1 through at least one coil support 401 or a coil mounting plate 403. Figure 4 As shown, the number of coils 402 is one, the number of coil supports 401 is two, and one coil 402 is connected between two coil supports 401; in other embodiments, such as Figure 7 As shown, the number of coils 402 is two, the number of coil supports 401 is two, and the two coils 402 are connected to the two coil supports 401 respectively; in other embodiments, such as Fig.10 As shown, the number of coils 402 is one, the number of coil brackets 401 is one, and the coil 402 is connected to the coil bracket 401; Fig.12 and Fig.14 As shown, the number of coils 402 is one, the number of coil mounting plates 403 is one, and the coil mounting plates 403 are fixedly connected to the main bracket 1. Of course, the coil mounting plates 403 may not be used, and the coils 402 are directly connected to the main bracket 1. The number of coils 402 in this application is not limited and can be designed according to actual needs.

[0059] In some embodiments, the inner magnetic circuit assembly 301 includes a first magnetic conductive plate 3012 connected to the first magnet 3011, the outer magnetic circuit assembly 302 includes a second magnetic conductive plate 3022 connected to the second magnet 3021, the second magnetic conductive plate 3022 surrounds the outside of the first magnetic conductive plate 3012, and the coil 402 surrounds the outer periphery of the first magnetic conductive plate 3012 and is located between the first magnetic conductive plate 3012 and the second magnetic conductive plate 3022. The magnetic conductive plate can guide the magnetic flux lines to pass through the coil more concentratedly, further improving the utilization rate of the magnetic field.

[0060] The number of the first magnet 3011 and the second magnet 3021 can be one or more, and the number of the first magnet 3011 and the second magnet 3021 can be the same or different. Fig.15 As shown, the outer magnetic circuit component 302 includes at least two second magnets 3021 arranged along the vibration direction, two adjacent second magnets 3021 are arranged opposite to each other with the same poles, and are connected through the second magnetic conductive plate 3022, the inner magnetic circuit component 301 includes only one first magnet 3011, and one second magnet 3021 of the outer magnetic circuit component 302 surrounds the outside of the first magnet 3011. Optionally, the thickness of the first magnet 3011 and the second magnet 3021 are both greater than the thickness of the first magnetic conductive plate 3012 and the second magnetic conductive plate 3022, and the thickness of the first magnetic conductive plate 3012 and the second magnetic conductive plate 3022 are the same, so as to improve the magnetic performance of the magnetic circuit component and prevent the volume of the magnetic circuit component from being too large due to the excessive thickness of the magnetic conductive plate.

[0061] In some embodiments, Figure 4 , Figure 7 , Fig.10 and Fig.12 As shown, the inner magnetic circuit component 301 includes at least two first magnets 3011 arranged along the vibration direction A, and two adjacent first magnets 3011 are arranged opposite to each other with the same poles, and are connected through a first magnetic conductive plate 3012; preferably, the number of first magnets 3011 and second magnets 3021 is the same, and each first magnet 3011 is surrounded by a second magnet 3021, and the thickness of the first magnet 3011 and the second magnet 3021 surrounded by it are the same. A coil 402 is surrounded by the outer periphery of at least one first magnetic conductive plate 3012, and when the vibrator component 3 is in the original position, the two ends of the coil 402 extend beyond the two ends of the first magnetic conductive plate 3012, so as to reliably drive the vibrator component 3 to vibrate through the coil 402.

[0062] In the case where there are multiple first magnetic conductive plates 3012, only one first magnetic conductive plate 3012 may be surrounded by a coil 402; or each first magnetic conductive plate 3012 may be surrounded by a coil 402 (see Figure 7 ), and at the same time, the current directions in the two adjacent coils 402 are opposite, so that the two coils 402 provide driving forces in the same direction to the vibrator assembly 3.

[0063] Further, the number of the magnetic conductive members is one or two. In some embodiments, Figure 4 , Figure 7 , Fig. 9 and Fig.10 As shown, the magnetic conductive member is a plate-shaped magnetic conductive sheet 304; in other embodiments, such as Fig.12 and Fig.14As shown, the magnetic conductive member is a magnetic conductive bowl, which includes a magnetic conductive sheet 304 and a magnetic conductive ring 305 connected to the magnetic conductive sheet 304. The magnetic conductive ring 305 is integrally formed with the magnetic conductive sheet 304 and surrounds the outside of the outer magnetic circuit component 302. Optionally, the magnetic conductive ring 305 is in contact with the outer surface of the outer magnetic circuit component 302, or is spaced relative to the outer surface of the outer magnetic circuit component 302. The inner magnetic circuit component 301 and the outer magnetic circuit component 302 are connected by the magnetic conductive bowl or the magnetic conductive sheet 304, so that the magnetic flux lines are easier to close, and the magnetic utilization rate is further improved.

[0064] As a preferred embodiment, Figure 3 , Figure 8 and Fig.11 As shown, the first elastic member 2 includes an outer frame 201 fixed relatively to the main support 1, an inner frame 202 arranged in the outer frame 201, and an elastic arm 203 connected between the outer frame 201 and the inner frame 202. The shape of the elastic arm 203 can be designed according to actual needs, for example, it can be designed to be in an arc, bent or curved state, and the present application does not limit this shape. Preferably, the whole formed by all elastic arms 203 is centrally symmetrically arranged so that the forces on both sides of the inner frame 202 are more balanced. Further preferably, the first elastic member 2 is centrally symmetrically arranged as a whole. In this embodiment, the outer frame 201 of the first elastic member 2 is connected to the main support 1, and the inner frame 202 of the first elastic member 2 is directly connected to the vibrator assembly 3 or connected through a gasket 5.

[0065] In some embodiments, Fig.10 As shown, one end of the main support 1 is open, and the other end is provided with a bottom plate 104. The stator assembly 4 also includes a coil support 401 connected between the bottom plate 104 and the coil 402. Fig.10 In the illustrated embodiment, the coil support 401 and the bottom plate 104 are integrally formed.

[0066] In some embodiments, Figure 4 and Figure 7 As shown, the main bracket 1 is a hollow bracket made of non-magnetic material or magnetic material, which is also provided with a second open end 103, and the first open end 102 and the second open end 103 are respectively located at the two ends of the main bracket 1, and the linear motor also includes a second elastic member 6 connected between the vibrator assembly 3 and the main bracket 1, and the first elastic member 2 is arranged at the second open end 103. The first elastic member 2 and the second elastic member 6 are respectively connected to the two ends of the vibrator assembly 3 through the gasket 5; a magnetic conductive sheet 304 is connected to both ends of the inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302. The structure of double elastic members ensures the stability of the linear motor and improves the reliability of the product. It can be understood that the shapes of the first open end 102 and the second open end 103 correspond to the shapes of the first elastic member 2 and the second elastic member 6, for example, they can be designed to be circular or elliptical according to actual needs.

[0067] Workflow:

[0068] Alternating current is passed through the coil 402, and the coil 402 is located in the strong magnetic field generated by the inner magnetic circuit component 301 and the outer magnetic circuit component 302. The energized coil 402 will be acted upon by the Ampere force in the magnetic field. The force direction can be determined by the left-hand rule. According to Newton's third law, the vibrator component 3 will be acted upon by an equal and opposite force. Since the coil 402 is fixed to the main support 1 through the coil support 401, and the main support 1 is generally connected to an external device and can generally be regarded as a rigid connection, the vibration amplitude is small, while the vibrator component 3 subjected to the reaction force is connected to the main support 1 by the first elastic member 2 and / or the second elastic member 6, and is non-rigidly connected to the outside, and will have a larger vibration amplitude; the two vibration effects are superimposed to drive the external device to vibrate.

[0069] like Figure 6 As shown, Figure 6 It shows Figure 4 The frequency response curve comparison diagram of the linear motor shown is compared with the conventional linear motor described in the background technology section. When comparing the vibration responses under the same power, for motor systems of the same volume and the same natural frequency, the linear motor of this scheme has a better overall vibration response due to its higher magnetic properties.

[0070] Further, such as Figure 4 , Figure 7 and Fig.10 As shown, the linear motor further includes an end cap 7 that seals the first open end 102 and the second open end 103. The end cap 7 is disposed relatively spaced apart from the first elastic member 2 and / or the second elastic member 6. The end cap 7 protects the first elastic member 2 and / or the second elastic member 6. Figure 3 , Figure 4 and Figure 7 As shown, the coil support 401 of the stator assembly 4 includes a connecting portion 404 that passes through the first elastic member 2 or the second elastic member 6 and is connected to the main support 1 and / or the end cover 7 to increase the stability of the linear motor and improve the reliability of the product.

[0071] In some embodiments, Fig.10 As shown, the main bracket 1 is a groove bracket made of non-magnetic material or magnetic material, only has a first open end 102, and is not provided with a second elastic member 6 and a gasket 5 and an end cover 7 connected to the second elastic member 6. The coil 402 is connected to the bottom plate 104 of the main bracket 1 through a coil bracket 401, or the coil 402 is connected to the bottom plate 104 of the main bracket 1 through a coil mounting plate 403. The structure is simple and the processing is convenient. It can be understood that the shapes of the first open end 102 and the second open end 103 correspond to the shapes of the first elastic member 2 and the second elastic member 6, respectively, and can be designed to be circular or elliptical according to actual needs.

[0072] Embodiment 1:

[0073] like Figures 2 to 4 As shown, a linear motor includes a main support 1, a first elastic member 2, a vibrator assembly 3 and a stator assembly 4.

[0074] The main stent 1 comprises an inner cavity 101, and is provided with a first open end 102. In this embodiment, the main stent 1 is an annular structure with two ends open.

[0075] The first elastic member 2 is disposed at the first open end 102 , and the first elastic member 2 is fixed to the main bracket 1 by welding or gluing.

[0076] The vibrator assembly 3 is arranged inside the inner cavity 101 and connected to the first elastic member 2. It includes a magnetic conductive sheet 304 and an inner magnetic circuit assembly 301 and an outer magnetic circuit assembly 302 connected to the magnetic conductive sheet 304. The inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302 cooperate to form an annular magnetic gap 303.

[0077] The stator assembly 4 includes a coil 402 fixed relative to the main support 1 . The coil 402 is at least partially located in the annular magnetic gap 303 . The stator assembly 4 drives the vibrator assembly 3 to vibrate.

[0078] The main bracket 1 is a hollow bracket made of non-magnetic material or magnetic material, and its cross-section is elliptical. It is also provided with a second open end 103, and the first open end 102 and the second open end 103 are respectively located at the two ends of the main bracket 1. The linear motor also includes a second elastic member 6 connected between the vibrator assembly 3 and the main bracket 1. The first elastic member 2 is arranged at the second open end 103, and the structure of the second elastic member 6 is the same as that of the first elastic member 2. The structure of the double elastic member reduces the degree of freedom of the vibrator assembly 3, and its working state and vibration will be relatively stable, so that the upper and lower magnetic conductive sheets 304 can better close the magnetic field and enhance the magnetic effect of the system.

[0079] The linear motor further includes an end cover 7 for sealing the first open end 102 and the second open end 103 , and the end cover 7 is used to protect the first elastic member 2 and the second elastic member 6 .

[0080] In this embodiment, the two ends of the vibrator assembly 3 are connected to the inner frame 202 of the first elastic member 2 and the second elastic member 6 through gaskets 5, respectively. The gaskets 5 prevent the vibrator assembly 3 from colliding with the first elastic member 2 and the second elastic member 6 during vibration.

[0081] Among them, the vibrator assembly 3 includes two magnetic conductive sheets 304 and an inner magnetic circuit assembly 301 and an outer magnetic circuit assembly 302 connected to the two magnetic conductive sheets 304. The two magnetic conductive sheets 304 are respectively connected to the two ends of the inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302. The inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302 cooperate to form an annular magnetic gap 303. The coil of the stator assembly 4 is at least partially located in the annular magnetic gap 303. In this embodiment, two groups of magnetic circuit assemblies located on the inner and outer sides of the stator assembly 4 are arranged to increase the magnetic flux passing through the stator assembly 4.

[0082] The inner magnetic circuit component 301 includes two first magnets 3011 and a first magnetic conductive plate 3012, the first magnetic conductive plate 3012 is connected between two adjacent first magnets 3011, and the two adjacent first magnets 3011 are arranged with the same poles opposite to each other; the outer magnetic circuit component 302 includes two second magnets 3021 and a second magnetic conductive plate 3022, the second magnetic conductive plate 3022 is connected between two adjacent second magnets 3021, and the two adjacent second magnets 3021 are arranged with the same poles opposite to each other.

[0083] The stator assembly includes two coil supports 401 fixedly connected to the main support 1 and a coil 402 installed between the two coil supports 401, and at least part of the coil 402 surrounds the outer periphery of the first magnetic conductive plate 3012 and the inner periphery of the second magnetic conductive plate 3022. The two coil supports 401 are used to support the coil 402 and to lead out the leads to connect to the FPC. Figure 3 As shown, the coil support 401 includes an outwardly protruding connection portion 404, the connection portion 404 of the upper coil support 401 passes through the upper magnetic conductive sheet 304 and the first elastic member 2 and is connected to the upper end cover 7, and the connection portion 404 of the lower coil support 401 passes through the lower magnetic conductive sheet 304 and the second elastic member 6 and is connected to the lower end cover 7. It is understandable that the connection portion 404 can also be provided with a turning structure to be directly connected to the main support 1.

[0084] The first magnet 3011 and the second magnet 3021 are magnetized along the vibration direction A, and the magnetization directions are opposite, so that the polarities of the two magnetic poles of the first magnet 3011 and the second magnet 3021 are opposite, so that the magnetic flux lines derived by the first magnetic conductive plate 3012 and the second magnetic conductive plate 3022 are just opposite, so that the magnetic flux lines are closed, and then a closed magnetic field can be formed, and the coil 402 is in the magnetic field, so that the magnetic flux passing through the coil 402 is significantly increased, thereby improving the magnetic performance of the system. Figure 4 As shown, the inner and outer magnetic circuit components form a closed magnetic field, which significantly increases the magnitude of the magnetic flux passing through the coil 402.

[0085] Embodiment 2:

[0086] refer to Figure 7, a bone conduction sound generating device, based on the first embodiment, except that:

[0087] The inner magnetic circuit component 301 includes three first magnets 3011 and two first magnetic conductive plates 3012, the first magnetic conductive plates 3012 are connected between two adjacent first magnets 3011, and the two adjacent first magnets 3011 are arranged opposite to each other with the same poles; the outer magnetic circuit component 302 includes two second magnets 3021 and a second magnetic conductive plate 3022, the second magnetic conductive plate 3022 is connected between two adjacent second magnets 3021, and the two adjacent second magnets 3021 are arranged opposite to each other with the same poles.

[0088] The stator assembly includes two coil supports 401 fixedly connected to the main support 1 and two coils 402 respectively mounted on the two coil supports 401, and at least part of the coils 402 respectively surround the outer peripheries of the two first magnetic conductive plates 3012 and the inner peripheries of the two second magnetic conductive plates 3022. The two coil supports 401 are respectively used to support the two coils 402 and at the same time lead out leads to connect to the FPC.

[0089] Embodiment three:

[0090] refer to Figures 8 to 10 , a bone conduction sound generating device, based on the first embodiment, except that:

[0091] The main bracket 1 is a groove bracket made of non-magnetic material or magnetic material, which only has a first open end 102 and no second open end 103. It is provided with a first elastic member 2 and an end cover 7 sealing the first open end, but no second elastic member 6 and the end cover 7 on the other side are provided. The inner frame 202 of the first elastic member 2 is connected to the vibrator assembly 3 through a gasket 5.

[0092] In this embodiment, the vibrator assembly 3 includes a magnetic conductive sheet 304 and an inner magnetic circuit assembly 301 and an outer magnetic circuit assembly 302 connected to the magnetic conductive sheet 304 . The magnetic conductive sheet 304 is connected to the ends of the inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302 close to the first elastic member 2 .

[0093] The stator assembly 4 includes a coil support 401 fixedly connected to the main support 1 and a coil 402 mounted on the coil support 401, and at least part of the coil 402 surrounds the outer periphery of the first magnetic conductive plate 3012 of the inner magnetic circuit assembly 301 and the inner periphery of the second magnetic conductive plate 3022 of the outer magnetic circuit assembly 302. The coil support 401 is directly connected to the bottom plate 104 of the main support 1, and the coil 402 is supported by the coil support 401, and the lead wire is led out to connect the FPC. The vibrator assembly 3 is arranged relative to the bottom plate 104 of the main support 1 to prevent the vibrator assembly 3 from hitting the stator assembly 4 during the vibration of the vibrator assembly 3.

[0094] Embodiment 4:

[0095] refer to Fig.11 and Fig.12 , a bone conduction sound generating device, based on the third embodiment, except that:

[0096] In this embodiment, the first elastic member 2 is circular, so the main bracket 1 (not shown) preferably also has a circular cross-sectional shape.

[0097] In this embodiment, the vibrator assembly 3 includes a magnetic bowl and an inner magnetic circuit assembly 301 and an outer magnetic circuit assembly 302 connected to the magnetic bowl. The magnetic bowl includes a magnetic sheet 304 and a magnetic ring 305 connected to the magnetic sheet 304. The magnetic ring 305 surrounds the outer surface of the outer magnetic circuit assembly 302 and fits the outer surface of the outer magnetic circuit assembly 302. The inner magnetic circuit assembly 301 and the outer magnetic circuit assembly 302 are arranged relatively spaced inside the magnetic bowl, and the ends of the two close to the first elastic member 2 are connected to the magnetic sheet 304, and the magnetic sheet 304 is connected to the first elastic member 2 through the gasket 5.

[0098] The stator assembly 4 includes a coil mounting plate 403 fixedly connected to the main bracket 1 and a coil 402 mounted on the coil mounting plate 403, at least part of the coil 402 surrounds the outer periphery of the first magnetic conductive plate 3012 of the inner magnetic circuit assembly 301 and the inner periphery of the second magnetic conductive plate 3022 of the outer magnetic circuit assembly 302. The coil mounting plate 403 is connected to the bottom plate 104 of the main bracket 1, and the coil mounting plate 403 is used to support the coil 402 and to guide the lead wire to connect the FPC. The vibrator assembly 3 and the coil mounting plate 403 are arranged relative to each other to prevent the vibrator assembly 3 from hitting the stator assembly 4 during the vibration of the vibrator assembly 3.

[0099] It is understandable that the coil mounting plate 403 may be omitted, so that the coil 402 is directly connected to the bottom plate 104 , or connected to the bottom plate 104 through the coil support 401 .

[0100] Embodiment five:

[0101] refer to Fig.13 and Fig.14 , a bone conduction sound generating device, based on the fourth embodiment, except that:

[0102] The outer magnetic circuit assembly 302 is a single integrally magnetized part, wherein the second magnet 3021 and the second magnetic conductive plate 3022 are part of the outer magnetic circuit assembly 302 rather than a single part, thereby reducing the number of components and assembly complexity.

[0103] The external magnetic circuit component 302 forms two magnetic parts and a non-magnetic part between the two magnetic parts by magnetizing different regions. The two magnetic parts are two second magnets 3021 , and the non-magnetic part is the second magnetic conductive plate 3022 . Fig.13The dotted line in the figure indicates the boundary position between the second magnet 3021 and the second magnetic conductive plate 3022 .

[0104] It is understandable that the inner magnetic circuit component 301 can also be configured as a single part that is magnetized in one piece. The inner magnetic circuit component 301 and the outer magnetic circuit component 302 in other embodiments can also be configured as a single part that is magnetized in one piece.

[0105] Embodiment six:

[0106] refer to Fig.15 , a bone conduction sound generating device, based on the fourth embodiment, except that:

[0107] In this embodiment, the inner magnetic circuit component 301 includes only a first magnet 3011 connected to the magnetic conductive plate 304, and the outer magnetic circuit component 302 includes two second magnets 3021 with the same poles arranged opposite to each other. One of the two second magnets 3021 surrounds the outer periphery of the first magnet 3011. The coil 402 extends into the annular space between the first magnetic conductive plate 3012 and the second magnetic conductive plate 3022.

[0108] In this embodiment, the stator assembly also includes a third magnet 3031 disposed in the coil 402. The third magnet 3031 and the first magnet 3011 are arranged opposite to each other with the same pole. The third magnet 3031 is conducive to maintaining static balance of the vibrator assembly when the coil 402 is not energized, thereby improving sensitivity.

[0109] The coil 402 and the third magnet 3031 are connected to the coil mounting plate 403 . It is understandable that the coil mounting plate 403 may be omitted, and the coil 402 and the third magnet 3031 are both connected to the bottom plate 104 .

[0110] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of the subject matter, nor should it be considered that the applicant has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A linear motor, characterized in that: include: A main stent, comprising an inner cavity, wherein the main stent is provided with a first open end; A first elastic member, disposed at the first opening end; a vibrator assembly, disposed inside the inner cavity and connected to the first elastic member, the vibrator assembly comprising a magnetic conductive sheet; and The stator assembly is fixed relative to the main bracket.

2. The linear motor according to claim 1, characterized in that: The vibrator assembly also includes an inner magnetic circuit assembly and an outer magnetic circuit assembly, at least one end of the inner magnetic circuit assembly and the outer magnetic circuit assembly is connected to the magnetic conductive sheet, the outer magnetic circuit assembly surrounds the outside of the inner magnetic circuit assembly, and the two are relatively spaced apart to form an annular magnetic gap; the stator assembly includes a coil, at least part of the coil is located in the annular magnetic gap.

3. The linear motor according to claim 2, characterized in that: The inner magnetic circuit component includes a first magnet and a first magnetic conductive plate connected to the first magnet, the outer magnetic circuit component includes a second magnet surrounding the outside of the first magnet and a second magnetic conductive plate connected to the second magnet, the second magnetic conductive plate surrounds the outside of the first magnetic conductive plate, and the coil surrounds the outer circumference of the first magnetic conductive plate and is located between the first magnetic conductive plate and the second magnetic conductive plate.

4. The linear motor according to claim 3, characterized in that: The first magnet and the second magnet are both magnetized along the vibration direction, and the polarities of the two magnetic poles of the first magnet and the second magnet that are oppositely arranged are opposite.

5. The linear motor according to claim 4, characterized in that: The inner magnetic circuit assembly includes at least two first magnets, two adjacent first magnets are connected by the first magnetic conductive plate, and are arranged opposite to each other with the same poles along the vibration direction; the outer magnetic circuit assembly includes at least two second magnets, two adjacent second magnets are connected by the second magnetic conductive plate, and are arranged opposite to each other with the same poles along the vibration direction; The thickness of the first magnet and the second magnet are both greater than the thickness of the first magnetic conductive plate and the second magnetic conductive plate; The first magnetic conductive plate and the second magnetic conductive plate have the same thickness.

6. The linear motor according to claim 5, characterized in that: The first magnets and the second magnets are the same in number and thickness; each of the second magnets surrounds the outside of one of the magnets; The coil surrounds the outer periphery of at least one of the first magnetic conductive plates. When the vibrator assembly is in the original position, two ends of the coil extend beyond two ends of the first magnetic conductive plate.

7. The linear motor according to claim 6, characterized in that: The coil is surrounded by only one of the first magnetic conductive plates; or, A coil is surrounded on the outer periphery of each of the first magnetic conductive plates, and the current directions in two adjacent coils are opposite at the same time.

8. The linear motor according to any one of claims 2 to 7, characterized in that: It also includes a magnetic conductive ring connected to the magnetic conductive sheet, the magnetic conductive ring and the magnetic conductive sheet are integrally formed and surround the outside of the external magnetic circuit component; The magnetic conductive ring is in contact with the outer surface of the outer magnetic circuit component, or is arranged with a relative spacing from the outer surface of the outer magnetic circuit component.

9. The linear motor according to any one of claims 2 to 7, characterized in that: The first elastic member includes an outer frame, an inner frame and an elastic arm, the inner frame is arranged in the outer frame, and the elastic arm is connected between the outer frame and the inner frame; the main bracket is connected to the outer frame, the vibrator assembly is directly connected to the inner frame, or the vibrator assembly and the inner frame are connected via a gasket.

10. The linear motor according to claim 9, characterized in that: One end of the main bracket is open, and the other end is provided with a bottom plate. The stator assembly comprises a coil bracket, and the coil bracket is connected between the bottom plate and the coil.

11. The linear motor according to claim 9, characterized in that: It also includes a second elastic member, the second elastic member is connected to the vibrator assembly, the main bracket is provided with a second open end, the first open end and the second open end are respectively located at two ends of the main bracket, the first elastic member and the second elastic member are respectively provided at the first open end and the second open end, and the two are respectively connected to two ends of the vibrator assembly; The two ends of the inner magnetic circuit component and the outer magnetic circuit component are both connected with a magnetic conductive sheet.

12. The linear motor according to claim 11, characterized in that: It also includes an end cap, which seals the first open end and the second open end.

13. The linear motor according to claim 12, characterized in that: The stator assembly also includes a coil support, which is connected to the coil. The coil support includes a connecting portion, which passes through the magnetic conductive sheet and the first elastic member or the second elastic member and is connected to the main support and / or the end cover.

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