Linear motor

Abstract

The utility model belongs to linear motor technical field discloses a kind of linear motor.The linear motor includes shell, mover assembly and stator assembly, the mover assembly includes vibrator and permanent magnet, the permanent magnet is fixedly arranged in the vibrator;The stator assembly includes winding block and winding, the winding block is fixedly arranged in the shell, wire is wound on the winding block and forms the winding, the radial section of the wire is rectangle, the winding is connected into alternating current and drives the mover assembly reciprocating vibration along vibration direction.The linear motor improves space utilization, improves full slot rate and power density is lower, can provide more abundant vibration feeling, reduces resistance and heat generation in working, reduces energy consumption, improves efficiency, optimizes user experience.

Description

Technical Field

[0001] This utility model relates to the field of linear motor technology, and in particular to a linear motor. Background Technology

[0002] Linear motors are commonly found in existing electronic devices such as smartphones, smartwatches, and wearable devices like VR / CR to enhance the user experience. The main structure of a linear motor consists of a stator assembly and a mover assembly. The stator assembly has windings, and the mover assembly has magnets. By passing alternating current through the windings, the magnets drive the mover assembly to vibrate.

[0003] In existing technologies, the winding is made by winding circular wires on an iron core. The circular wires have gaps during winding, resulting in low space utilization, low slot fill factor, and low power density, leading to lower linear motor power and a smaller vibration range. Furthermore, the smaller cross-sectional area of ​​the circular wires results in higher resistance, generating more heat during operation, leading to higher energy consumption, lower efficiency, and negatively impacting the user experience. Utility Model Content

[0004] The purpose of this invention is to provide a linear motor that improves space utilization, increases slot fill factor and power density, provides richer vibration feedback, reduces resistance and heat generation during operation, reduces energy consumption, improves efficiency, and optimizes user experience.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A linear motor, comprising:

[0007] case;

[0008] A mover assembly, the mover assembly including an oscillator and a permanent magnet, the permanent magnet being fixedly disposed on the oscillator;

[0009] A stator assembly, comprising a winding block and a winding, wherein the winding block is fixedly disposed on the housing, and a conductor is wound on the winding block to form the winding, wherein the radial cross-section of the conductor is rectangular, and an alternating current is passed through the winding to drive the mover assembly to reciprocate along the vibration direction, thereby causing the housing to vibrate.

[0010] Preferably, the oscillator has a receiving hole, and the stator assembly and the permanent magnet are both disposed in the receiving hole, with the permanent magnet located on both sides of the stator assembly perpendicular to the vibration direction of the mover assembly.

[0011] Preferably, the mover assembly further includes a magnetic guide plate, which is attached to the inner wall of the receiving hole, and a plurality of permanent magnets are arranged along the vibration direction of the mover assembly and magnetically fixed to the magnetic guide plate.

[0012] Preferably, the mover assembly further includes a buffer block, which is fixedly disposed on the inner wall of the receiving hole in the vibration direction of the mover assembly.

[0013] Preferably, the linear motor further includes an elastic component disposed between the vibrator and the housing, and the vibrator has the elastic component disposed on both sides of the vibrating direction.

[0014] Preferably, the elastic component includes an elastic element and a damping block. The elastic element includes a first elastic portion and a second elastic portion connected together. The first elastic portion and the second elastic portion can move closer or further apart to store or release elastic potential energy. The first elastic portion abuts against the housing, and the second elastic portion abuts against the oscillator. The damping block increases the damping of the elastic element when it deforms.

[0015] Preferably, a limiting block is provided on the side of the first elastic portion facing the second elastic portion; and / or,

[0016] A limit block is provided on the side of the second elastic part facing the first elastic part.

[0017] Preferably, the winding block includes an iron core and at least two pole shoes, the at least two pole shoes are spaced apart on the iron core, the winding is wound on the iron core, and a set of the winding is provided between every two pole shoes.

[0018] Preferably, the housing has heat dissipation holes.

[0019] Preferably, the linear motor further includes a heat dissipation assembly, and the housing includes a base plate and a top cover, with the heat dissipation assembly attached to the outer surface of the top cover.

[0020] The beneficial effects of this utility model are:

[0021] This invention provides a linear motor. In this linear motor, the housing is used to fix the stator assembly, ensuring that the stator assembly remains stable after the linear motor starts. By passing an alternating current through the windings of the stator assembly, an alternating magnetic field is formed by the winding blocks. The permanent magnet of the mover assembly is subjected to alternating and opposite forces in the alternating magnetic field, thereby driving the oscillator to reciprocate along the vibration direction. The mover assembly drives the housing to vibrate, thus generating a vibration sensation in the electronic device. Since the radial cross-section of the winding conductors is rectangular, the gaps between the conductors can be smaller during winding, improving space utilization, increasing the slot fill factor, and reducing power density. This increases the power of the linear motor within the same volume, expands the vibration range of the linear motor, and provides a richer vibration sensation. Furthermore, the larger cross-sectional area of ​​the rectangular conductors reduces resistance and heat generation during operation, lowering energy consumption, improving efficiency, and optimizing the user experience. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the linear motor provided in this embodiment of the utility model;

[0023] Figure 2 This is an exploded view of the linear motor provided in this embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the moving part assembly and the elastic part provided in the embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the stator assembly provided in an embodiment of the present invention;

[0026] Figure 5 This is a partial cross-sectional view of the stator assembly provided in an embodiment of this utility model.

[0027] In the picture:

[0028] 1. Housing; 11. Top cover; 111. Ventilation holes; 12. Base plate; 13. Connecting lugs;

[0029] 2. Stator assembly; 21. Winding block; 211. Iron core; 212. Pole shoe; 22. Winding; 221. Conductor;

[0030] 3. Moving element assembly; 31. Permanent magnet; 32. Oscillator; 321. Receiving hole; 33. Magnetic guide plate; 34. Buffer block;

[0031] 4. Elastic component; 41. Elastic element; 411. First elastic part; 412. Second elastic part; 42. Damping block; 43. Limiting block; 44. First connector; 45. Second connector;

[0032] 5. Heat dissipation components;

[0033] 6. FPC board. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] This invention provides a linear motor, which is commonly used in electronic devices such as smartphones and smartwatches, as well as wearable devices such as VR / CR, to improve the user experience. Figures 1-3 As shown, the linear motor includes a housing 1, a stator assembly 2, and a mover assembly 3. The stator assembly 2 and the mover assembly 3 are disposed inside the housing 1. The stator assembly 2 is provided with a winding 22, and the mover assembly 3 is provided with a permanent magnet 31. By passing an alternating current through the winding 22, the mover assembly 3 can be driven to vibrate through the permanent magnet 31.

[0039] like Figures 3-5As shown, the mover assembly 3 includes an oscillator 32, and a permanent magnet 31 is fixedly mounted on the oscillator 32; the stator assembly 2 includes a winding block 21, which is fixedly mounted on the housing 1. A wire 221 is wound on the winding block 21 to form a winding 22. The radial cross section of the wire 221 is rectangular. An alternating current is passed through the winding 22 to drive the mover assembly 3 to reciprocate along the vibration direction. The mover assembly 3 drives the housing 1 to vibrate.

[0040] In this linear motor, the housing 1 is used to fix the stator assembly 2, ensuring that the stator assembly 2 remains stable after the linear motor starts. By passing an alternating current through the winding 22 of the stator assembly 2, an alternating magnetic field is formed by the winding block 21. The permanent magnet 31 of the mover assembly 3 is subjected to alternating and opposite forces in the alternating magnetic field, thereby driving the oscillator 32 to reciprocate along the vibration direction. The mover assembly 3 drives the housing 1 to vibrate, thus generating a vibration sensation in the electronic device. Since the radial cross-section of the wire 221 of the winding 22 is rectangular, the wire 221 can achieve smaller gaps during winding around the winding block 21, improving space utilization, increasing the slot fill factor and power density, thereby increasing the power of the linear motor in the same volume, increasing the vibration range of the linear motor, and providing a richer vibration sensation. Furthermore, the larger cross-sectional area of ​​the rectangular wire 221 reduces resistance and heat generation during operation, reducing energy consumption, improving efficiency, and optimizing the user experience.

[0041] In some embodiments, the winding block 21 includes an iron core 211 and at least two pole shoes 212, with the at least two pole shoes 212 spaced apart from the iron core 211. A winding 22 is wound around the iron core 211, and a set of windings 22 is provided between every two pole shoes 212. The pole shoes 212 can "guide" the magnetic lines of force, allowing them to enter the air gap in a more uniform and ideal state, thus ensuring a uniform distribution of magnetic flux in the air gap, reducing air gap magnetic resistance, and lowering losses.

[0042] like Figure 4 As shown, the winding block 21 includes three pole shoes 212, so the iron core 211 is wound with two sets of windings 22, and the middle pole shoe 212 has a connecting slot. The two sets of windings 22 are electrically connected through the connecting slot to avoid the wires 221 protruding and causing wear.

[0043] In this embodiment, the linear motor also includes an FPC (Flexible Printed Circuit) board 6. One end of the FPC board 6 is connected to the wire 221 of the winding 22, and the other end of the FPC board 6 is used to connect to the motherboard of the electronic device so that the electronic device can control the start of the linear motor.

[0044] like Figure 2 and Figure 3As shown, the oscillator 32 has a receiving hole 321, and both the stator assembly 2 and the permanent magnet 31 are disposed within the receiving hole 321. The permanent magnet 31 is located on both sides of the stator assembly 2 perpendicular to the vibration direction of the mover assembly 3. That is, with the vibration direction of the mover assembly 3 as the reference, the permanent magnet 31 is located beside the stator assembly 2. This structure ensures that the distance between the winding 22 and the permanent magnet 31 remains essentially unchanged during the vibration of the oscillator 32. The force exerted by the current in the winding 22 on the permanent magnet 31 only changes in direction. Therefore, it can improve the controllability of the amplitude and frequency of the oscillator 32, making the vibration meet the design requirements.

[0045] Preferably, the mover assembly 3 further includes a magnetic guide plate 33, which is attached to the inner wall of the receiving hole 321. Multiple permanent magnets 31 are arranged along the vibration direction of the mover assembly 3 and magnetically fixed to the magnetic guide plate 33. It is understood that the permanent magnets 31 are relatively brittle and hard, unsuitable for drilling, grooving, or other mechanical processing. By magnetically fixing multiple permanent magnets 31 to the entire magnetic guide plate 33, and then fixing the magnetic guide plate 33 to the oscillator 32, the permanent magnets 31 are easily secured. The magnetic guide plate 33 can also concentrate the magnetic field lines of the multiple permanent magnets 31, increasing the magnetic induction intensity and reducing losses. Furthermore, the magnetic guide plate 33 can dissipate heat from the permanent magnets 31, preventing them from overheating and demagnetizing.

[0046] Preferably, the mover assembly 3 further includes a buffer block 34, which is fixedly disposed on the inner wall of the receiving hole 321 in the vibration direction of the mover assembly 3. In order to prevent the stator assembly 2 from directly colliding with the oscillator 32 when it reciprocates in the receiving hole 321, a buffer block 34 needs to be provided between the stator assembly 2 and the oscillator 32, and the buffer block 34 needs to be disposed in the vibration direction of the oscillator 32 in order to buffer the oscillator 32 and the stator assembly 2 when the oscillator 32 vibrates.

[0047] In this embodiment, the oscillator 32 is flexibly connected to the housing 1. When the oscillator 32 reciprocates along the vibration direction, the movement of the oscillator 32 can be transmitted to the housing 1. This can both prevent the oscillator 32 from directly colliding with the housing 1 and prevent the oscillator 32 from being rigidly connected to the housing 1, which would result in excessive vibration of the housing 1 and an insufficiently gentle vibration.

[0048] like Figure 2 and Figure 3As shown, preferably, the linear motor further includes an elastic component 4, which is disposed between the oscillator 32 and the housing 1. The oscillator 32 has elastic components 4 on one or both sides in the vibration direction. When the oscillator 32 moves, it periodically compresses and releases the elastic components 4. When one side of the elastic component 4 releases, the other side is compressed. Simultaneously, the elastic components 4 drive the housing 1 to move, causing the housing 1 to vibrate. Due to the buffering effect of the elastic components 4, the vibration of the oscillator 32 can be flexibly transmitted to the housing 1 through the elastic components 4.

[0049] Specifically, the elastic component 4 includes an elastic element 41 and a damping block 42. The elastic element 41 includes a first elastic part 411 and a second elastic part 412 connected to each other. The first elastic part 411 and the second elastic part 412 can move closer or further apart to store or release elastic potential energy. The first elastic part 411 abuts against the housing 1, and the second elastic part 412 abuts against the oscillator 32. The damping block 42 increases the damping when the elastic element 41 deforms.

[0050] When the first elastic portion 411 and the second elastic portion 412 of the elastic element 41 approach each other, they can store elastic potential energy; when the first elastic portion 411 and the second elastic portion 412 of the elastic element 41 move away from each other, they can release elastic potential energy. The damping block 42 can quickly consume the elastic potential energy of the elastic element 41, reduce the amplitude of the elastic element 41, and also improve the follow-up of the housing 1 and the oscillator 32. When the oscillator 32 starts to vibrate, the housing 1 starts to vibrate immediately; when the oscillator 32 stops vibrating, the housing 1 also stops vibrating quickly, thus optimizing the vibration sensation.

[0051] Specifically, the damping block 42 can be disposed between the first elastic part 411 and the second elastic part 412, or between the second elastic part 412 and the oscillator 32, both of which can consume the elastic potential energy of the elastic element 41.

[0052] In this embodiment, a limiting block 43 is provided on the side of the first elastic part 411 facing the second elastic part 412. The limiting block 43 is located between the first elastic part 411 and the second elastic part 412. The limiting block 43 can limit the minimum distance between the first elastic part 411 and the second elastic part 412, that is, limit the maximum deformation of the elastic element 41, and prevent the first elastic part 411 and the second elastic part 412 from being over-compressed and exceeding the elastic limit, thus protecting the service life of the elastic element 41.

[0053] In some embodiments, a limiting block 43 is provided on the side of the second elastic portion 412 facing the first elastic portion 411. The limiting block 43 is located between the first elastic portion 411 and the second elastic portion 412. The limiting block 43 can limit the minimum distance between the first elastic portion 411 and the second elastic portion 412, that is, limit the maximum deformation of the elastic member 41, and prevent the first elastic portion 411 and the second elastic portion 412 from being over-compressed and exceeding the elastic limit, thus protecting the service life of the elastic member 41.

[0054] In this embodiment, the elastic component 4 further includes a first connector 44 and a second connector 45. The first connector 44 is fixedly disposed on the side of the first elastic part 411 opposite to the second elastic part 412, and the second connector 45 is fixedly disposed on the side of the second elastic part 412 opposite to the first elastic part 411. The first connector 44 is fixedly connected to the housing 1, and the second connector 45 is fixedly connected to the vibrator 32. This makes the flexible connection between the vibrator 32 and the housing 1 more reliable, improves the stability of the elastic component 41, and avoids abnormal noise or malfunction caused by the movement of the elastic component 41.

[0055] It is worth noting that when the linear motor is working, the winding 22 generates a large amount of heat, causing the linear motor temperature to rise. For example... Figure 2 As shown, in order to enable the linear motor to dissipate heat well, the housing 1 is provided with heat dissipation holes 111, so that when the linear motor is working, the air inside the housing 1 can exchange with the air outside the housing 1, thereby releasing the heat inside the housing 1 to the outside of the housing 1.

[0056] like Figure 1 and Figure 2 As shown, preferably, the linear motor further includes a heat dissipation component 5, which is attached to the outer surface of the housing 1. It is understood that the other side of the heat dissipation label is attached to the heat dissipation surface of the electronic device, such as the heat spreader or casing of the electronic device, and its function is to improve the rate and efficiency of heat exchange between the housing 1 and the electronic device, so that the heat generated by the linear motor can be quickly released to the outside of the electronic device.

[0057] Specifically, the heat dissipation component 5 includes an adhesive layer and a thermally conductive layer. The adhesive layer is located between the thermally conductive layer and the housing 1, and it can be used to adhere and fix the thermally conductive layer to the housing 1. Preferably, the adhesive layer is made of pressure-sensitive adhesive, and the thermally conductive layer is made of graphite. When the heat dissipation component 5 is subjected to pressure, the pressure-sensitive adhesive can adhere and fix the heat dissipation component 5 to the housing 1, while graphite has good thermal conductivity, which can realize rapid heat transfer.

[0058] Optionally, the heat dissipation component 5 also includes a buffer layer located between the adhesive layer and the thermally conductive layer. The buffer layer has a certain elasticity, so that when the linear motor is installed in the electronic device, the heat dissipation surface of the electronic device can press against the heat dissipation component 5. On the one hand, it can generate a certain pressure on the heat dissipation component 5 to ensure good contact, and on the other hand, it can improve the adhesion of the adhesive layer and prevent the heat dissipation component 5 from shifting.

[0059] Preferably, the buffer layer is made of foam, which is compressible and can absorb vibration and stress, preventing graphite from cracking and protecting the heat-conducting layer.

[0060] Optionally, the heat dissipation component 5 also includes a support layer. The support layer is located on the side of the heat-conducting layer away from the housing 1. The support layer directly abuts against the heat-conducting surface of the electronic device. The support layer mainly serves to support and protect other structures of the heat dissipation component 5, so it needs to have a certain degree of hardness and strength.

[0061] Preferably, the support layer is made of polypropylene material, which has certain strength and hardness, and good electrical insulation properties, thus preventing the linear motor from being affected by external circuits.

[0062] In this embodiment, the housing 1 includes a base plate 12 and a top cover 11. The stator assembly 2 is fixedly disposed on the base plate 12. The first elastic part 411 of the elastic member 41 is fixedly disposed on the side wall of the top cover 11 through the first connector 44. By disassembling the housing 1 into the base plate 12 and the top cover 11, it is easy to disassemble and assemble, which is beneficial to maintenance and repair.

[0063] It is understandable that the heat dissipation hole 111 is opened on the top cover 11, and the heat dissipation component 5 is attached to the outer surface of the top cover 11.

[0064] like Figure 1 and Figure 2 As shown, in order to facilitate the fixing of the linear motor, multiple connecting ears 13 are fixedly connected to the upper cover 11. By setting the connecting ears 13, it is easy to assemble the linear motor into the electronic device.

[0065] In this embodiment, three connecting ears 13 are provided, and the three connecting ears 13 are located on different sides of the upper cover 11. The connecting ears 13 are provided with fastening holes to facilitate the assembly of fasteners. The connecting ears 13 are made of stainless steel, preferably SUS301 or a similar material, requiring high hardness and strong support capacity. During assembly, they are fixed to the inside of the electronic device by screws, playing the role of connection and fixation.

[0066] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A linear motor, characterized in that, include: Shell (1); The mover assembly (3) includes an oscillator (32) and a permanent magnet (31), wherein the permanent magnet (31) is fixedly disposed on the oscillator (32). The stator assembly (2) includes a winding block (21) and a winding (22). The winding block (21) is fixedly disposed on the housing (1). A conductor (221) is wound on the winding block (21) to form the winding (22). The radial cross section of the conductor (221) is rectangular. An alternating current is passed through the winding (22) to drive the mover assembly (3) to reciprocate along the vibration direction. The mover assembly (3) drives the housing (1) to vibrate.

2. The linear motor according to claim 1, characterized in that, The oscillator (32) has a receiving hole (321), and the stator assembly (2) and the permanent magnet (31) are both disposed in the receiving hole (321), and the permanent magnet (31) is located on both sides of the stator assembly (2) perpendicular to the vibration direction of the mover assembly (3).

3. The linear motor according to claim 2, characterized in that, The mover assembly (3) also includes a magnetic guide plate (33), which is attached to the inner wall of the receiving hole (321). A plurality of permanent magnets (31) are arranged along the vibration direction of the mover assembly (3) and magnetically fixed to the magnetic guide plate (33).

4. The linear motor according to claim 2, characterized in that, The mover assembly (3) further includes a buffer block (34), which is fixedly disposed on the inner wall of the receiving hole (321) in the vibration direction of the mover assembly (3).

5. The linear motor according to claim 1, characterized in that, The linear motor further includes an elastic component (4), which is disposed between the vibrator (32) and the housing (1), and the vibrator (32) is provided with the elastic component (4) on both sides in the vibration direction.

6. The linear motor according to claim 5, characterized in that, The elastic component (4) includes an elastic element (41) and a damping block (42). The elastic element (41) includes a first elastic part (411) and a second elastic part (412) connected to each other. The first elastic part (411) and the second elastic part (412) can move closer or further apart to store or release elastic potential energy. The first elastic part (411) abuts against the housing (1), and the second elastic part (412) abuts against the oscillator (32). The damping block (42) increases the damping when the elastic element (41) deforms.

7. The linear motor according to claim 6, characterized in that, A limiting block (43) is provided on the side of the first elastic part (411) facing the second elastic part (412); and / or, The second elastic part (412) is provided with a limit block (43) on the side facing the first elastic part (411).

8. The linear motor according to claim 1, characterized in that, The winding block (21) includes an iron core (211) and at least two pole shoes (212), with at least two pole shoes (212) spaced apart from the iron core (211), and the winding (22) is wound around the iron core (211), with a set of the winding (22) provided between every two pole shoes (212).

9. The linear motor according to claim 1, characterized in that, The housing (1) has heat dissipation holes (111).

10. The linear motor according to claim 1, characterized in that, The linear motor also includes a heat dissipation component (5), and the housing (1) includes a base plate (12) and a top cover (11), with the heat dissipation component (5) attached to the outer surface of the top cover (11).

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