Linear motor and electronic device

Abstract

The embodiment of the application discloses a linear motor and electronic equipment, the linear motor includes upper shell, lower shell, moving component assembly, stator assembly and heat dissipation shell, the upper shell and the lower shell are surrounded to form a containing cavity, the moving component assembly and the stator assembly are arranged in the containing cavity, the stator assembly includes the core, the coil that sets on the core and the pole shoe that is located at the two sides of the coil, the heat dissipation shell is injection molded on the lower shell and injection molded on the circumferential outside of the coil and the shaft end outside of the pole shoe located at the two ends of the core, and the circumferential outside of the pole shoe is exposed from the heat dissipation shell.The linear motor is connected with the heat dissipation shell through the circumferential outside of the coil injection molding, the contact heat dissipation area of the heat dissipation shell and the coil is increased, and the heat dissipation performance and overall performance of the linear motor are improved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a linear motor and an electronic device. Background Technology

[0002] A linear motor mainly consists of a stator assembly and a mover assembly housed within a casing. The mover assembly is connected to the casing via a pair of V-shaped springs, while the stator assembly is fixed to the casing. When the linear motor is operating, the mover assembly can perform linear reciprocating motion relative to the stator assembly, generating vibration.

[0003] Currently, when a linear motor is operating, the current flowing through the coils of the stator assembly generates Joule heat. During high-frequency or prolonged vibration, heat accumulates rapidly. Because linear motors rely solely on passive heat dissipation through their metal casing, this results in slow heat dissipation, localized overheating, and consequently, easy material aging and performance degradation. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a linear motor and electronic device that improves the heat dissipation performance and overall performance of the linear motor.

[0005] In a first aspect, embodiments of the present invention provide a linear motor, the linear motor comprising: The upper and lower shells surround and form a accommodating cavity; The moving part assembly is located within the accommodating cavity; A stator assembly is disposed within a receiving cavity. The stator assembly includes a coil, an iron core, and pole shoes. At least one coil and pole shoes located on both sides of the coil are sleeved on the iron core. The heat sink is injection molded on the lower shell and on the outer circumferential side of the coil and the outer axial side of the pole shoes at both ends. The outer circumferential side of the pole shoes protrudes from the heat sink.

[0006] Optionally, the upper shell is provided with a first heat dissipation hole, and the lower shell is provided with a second heat dissipation hole, the positions of the first heat dissipation hole and the second heat dissipation hole both corresponding to the position of the coil.

[0007] Optionally, the linear motor also includes a top sealing film and a bottom sealing film, the top sealing film being adhered to the outer surface of the upper housing and covering the first heat dissipation hole, and the bottom sealing film being adhered to the outer surface of the lower housing and covering the second heat dissipation hole.

[0008] Optionally, the mover assembly includes a through hole, the stator assembly is located within the through hole, and the mover assembly reciprocates relative to the stator assembly along the length direction of the mover assembly.

[0009] Optionally, the moving component includes: The oscillator has a through hole, and the stator assembly is housed in the through hole; Two sets of magnets are installed inside the through hole and are located opposite each other on both sides of the width direction of the stator assembly; Two elastic elements are positioned on either side of the oscillator along its length, with their openings facing opposite directions.

[0010] Optionally, the mover assembly also includes two magnetic plates disposed within the through hole and located opposite each other on both sides of the stator assembly in the width direction, with each magnetic plate disposed between the corresponding magnet and the side wall of the through hole.

[0011] Optionally, the linear motor also includes two damping elements, which are respectively disposed on the two side walls of the through hole in the length direction or respectively disposed at both ends of the stator assembly in the length direction.

[0012] Optionally, the elastic element is mounted on the vibrator via a first positioning plate, and the elastic element is also mounted inside the upper shell via a second positioning plate.

[0013] Optionally, the linear motor also includes a circuit board, part of which is located on the lower housing and electrically connected to the stator assembly, and part of which is located on the outer side of the upper housing and connected to an external control circuit.

[0014] Optionally, the linear motor also includes a Hall sensor and a magnet paired with the Hall sensor, the magnet being fixed to the outer wall of the mover assembly, the Hall sensor being fixed to the circuit board and positioned opposite the magnet.

[0015] Optionally, the linear motor also includes a connecting lug, which is fixed to the outside of the upper housing.

[0016] Optionally, the heat sink is made of thermally conductive silicone.

[0017] Optionally, the materials of the top sealing film and the bottom sealing film are high molecular polymers.

[0018] Secondly, embodiments of the present invention also provide an electronic device, which includes a housing, a control circuit board, and a linear motor as described in the first aspect. The control circuit board and the linear motor are disposed within the housing, and the control circuit board is electrically connected to the linear motor.

[0019] The linear motor of this invention includes an upper shell, a lower shell, a mover assembly, a stator assembly, and a heat sink. The upper and lower shells surround and form a receiving cavity. The mover assembly and the stator assembly are disposed within the receiving cavity. The stator assembly includes an iron core, a coil sleeved on the iron core, and pole shoes located on both sides of the coil. The heat sink is injection molded onto the lower shell and is also injection molded on the circumferential outer side of the coil and on the outer side of the shaft ends of the pole shoes located at both ends of the iron core. The circumferential outer side of the pole shoes protrudes from the heat sink. By injection molding a heat sink connected to the lower shell on the circumferential outer side of the coil, this linear motor increases the contact area between the heat sink and the coil, thereby improving the heat dissipation performance and overall performance of the linear motor. Attached Figure Description

[0020] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which: Figure 1 This is an exploded structural diagram of a linear motor according to an embodiment of the present invention; Figure 2 This is an exploded structural diagram of the stator assembly and heat sink according to an embodiment of the present invention; Figure 3 This is an exploded structural diagram of the moving part component according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of a linear motor according to an embodiment of the present invention.

[0021] Figure label: 1-Upper shell; 11-First heat dissipation hole; 111-Through hole; 2-Lower shell; 21-Second heat dissipation hole; 3-Motor assembly; 31-Vibrator; 311-Through hole; 312-Groove; 32-Magnet; 33-Elastic element; 331-First positioning piece; 332-Second positioning piece; 34-Magnetic guide plate; 4-Stator assembly; 41-Coil; 42-Iron core; 43-Pole shoe; 5-Heat dissipation shell; 6-Top sealing film; 7-Bottom sealing film; 8-Damping element; 9-Circuit board; 10-Connecting ear; 12-Hall sensor; 13-Magnet; X-Length direction; Y-Width direction. Detailed Implementation

[0022] The present application is described below based on embodiments, but it is not limited to these embodiments. In the detailed description of the present application below, certain specific details are described in detail. Those skilled in the art can fully understand the present application without these details. To avoid obscuring the substance of the present application, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0023] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0024] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0026] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] Existing linear motors mainly rely on passive heat dissipation through their metal casings. Due to the compact structure of linear motors, heat conduction within the motor is hindered, leading to localized overheating, material aging (such as carbonization of the coil insulation and demagnetization of the magnets), performance degradation, and even affecting the stability of sensors near the linear motor.

[0028] To address the aforementioned issues, this application provides a linear motor in which a heat dissipation shell is formed by injection molding on the circumferential side of the coil, and the heat dissipation shell is integrally molded with the lower shell. This increases the contact area between the coil and the lower shell, thereby improving the heat dissipation of the coil, reducing the power consumption limitation of the linear motor, and thus improving the performance of the linear motor.

[0029] like Figure 1 As shown, the linear motor includes an upper housing 1, a lower housing 2, a mover assembly 3, a stator assembly 4, and a heat sink 5. The upper housing 1 and the lower housing 2 surround and form a receiving cavity, within which the mover assembly 3 and the stator assembly 4 are disposed. The heat sink 5 is injection molded onto the outer side of a portion of the stator assembly 4, specifically wrapping around the heat-generating components of the stator assembly 4. This allows the heat-generating components to transfer heat to the lower housing 2 through the heat sink 5, thereby transferring it to the outside and improving heat dissipation efficiency.

[0030] The upper shell 1 includes a top plate and a frame surrounding the top plate. The lower shell 2 is a plate-like structure that can close the opening of the upper shell 1. Both the upper shell 1 and the lower shell 2 can be made of stainless steel, preferably 444 stainless steel. 1 / 2H material, 444 The material should be 1 / 4H or a similar type. Besides being connected by bolts, welding, etc., the upper shell 1 and lower shell 2 also require sealant to seal the joint gaps, providing a protective seal. The sealant can be a liquid adhesive, such as UV adhesive or epoxy adhesive. The upper shell 1 and lower shell 2 facilitate the installation of the mover assembly 3 and stator assembly 4, and provide structural support for the entire linear motor.

[0031] like Figure 2As shown, the stator assembly 4 includes a coil 41, an iron core 42, and pole shoes 43. The coil 41 and pole shoes 43 are mounted on the iron core 42, with the pole shoes 43 located on either side of the coil 41. The coil 41, iron core 42, and pole shoes 43 together constitute the core electromagnetic system that generates vibration. The iron core 42 is the magnetic circuit framework of the linear motor, primarily functioning to guide and concentrate the magnetic field. The coil 41 converts electrical energy into magnetic field energy. The pole shoes 43 are mainly used to optimize the magnetic field distribution, making the driving force generated by the linear motor smoother and more efficient, thereby improving the quality of vibration and control precision.

[0032] In one embodiment, a coil 41 is wound on the surface of an iron core 42, and two pole shoes 43 are provided on the surface of the iron core 42, with the two pole shoes 43 located at the left and right ends of the coil 41.

[0033] In another embodiment, two coils 41 are wound on the surface of the iron core 42, spaced apart. Three pole shoes 43 are provided on the surface of the iron core 42, with each coil 41 having a pole shoe 43 at both its left and right ends, thus ensuring the two coils 41 are spaced apart. In this embodiment, four coils 41 are wound on the surface of the iron core 42, spaced apart. Five pole shoes 43 are provided on the surface of the iron core 42, with each coil 41 having a pole shoe 43 at both its left and right ends, thus ensuring the four coils 41 are spaced apart.

[0034] like Figure 1 , Figure 2 and Figure 4 As shown, the heat sink 5 is injection molded on the circumferential outer side of the coil 41, that is, a heat sink 5 is wrapped around the circumference of the coil 41 through an injection molding process. The contact area between the heat sink 5 and the coil 41 in the circumferential direction reaches 100%, which improves the heat dissipation of the coil 41, increasing the heat dissipation of the coil 41 from the original 20% to 50%, and reducing the power consumption limitation of the linear motor.

[0035] In this embodiment, when the heat sink 5 is injection molded to wrap the coil 41, it is also injection molded integrally with the lower shell 2, thereby fixing the stator assembly 4 onto the lower shell 2 as a whole and improving the performance of the lower shell 2. Furthermore, the heat sink 5 injection molds the coil 41 and the lower shell 2 as a whole, allowing the heat from the coil 41 to be quickly transferred to the lower shell 2 and then to the outside for heat dissipation, thus improving heat dissipation efficiency.

[0036] Furthermore, the heat sink 5 is also injection molded to the outer side of the shaft end of the pole shoes 43 located at the outermost two ends of the iron core 42, and the circumferential outer side of the pole shoes 43 is exposed from the heat sink 5. That is, the circumferential outer side of the pole shoes 43 in this embodiment is not covered by the heat sink 5.

[0037] It should be noted that before the heat sink 5 is injection molded, the coil 41 and pole shoe 43 are first installed on the iron core 42 according to the set position to form the stator assembly 4; then the stator assembly 4 is pre-fixed to the designated position of the lower shell 2; finally, the heat sink 5 is injection molded on the outside of the stator assembly 4 and the lower shell 2. The stator assembly 4 can be pre-fixed to the lower shell 2 by welding.

[0038] Optionally, the heat sink 5 can be made of thermally conductive silicone, which has high thermal conductivity and shock absorption properties. The heat sink 5 can also be made of other non-metallic materials, such as plastic or graphite.

[0039] like Figure 1 As shown, the upper shell 1 is provided with a first heat dissipation hole 11, and the lower shell 2 is provided with a second heat dissipation hole 21. The positions of the first heat dissipation hole 11 and the second heat dissipation hole 21 correspond to the positions of the coil 41, which can achieve heat dissipation. The positions and numbers of the first heat dissipation hole 11 and the second heat dissipation hole 21 correspond to the positions and numbers of the coil 41 in the stator assembly 4, thereby improving heat dissipation performance.

[0040] like Figure 1 As shown, the linear motor also includes a top sealing film 6 and a bottom sealing film 7. The top sealing film 6 is adhered to the outer surface of the upper shell 1 and covers the first heat dissipation hole 11 of the upper shell 1, thus providing a sealing and waterproof function. The bottom sealing film 7 is adhered to the outer surface of the lower shell 2 and covers the second heat dissipation hole 21 of the lower shell 2, thus providing a sealing and waterproof function. The top sealing film 6 and the bottom sealing film 7 are generally self-adhesive and can be directly applied to the outer surfaces of the upper shell 1 and the lower shell 2, respectively. The top sealing film 6 and the bottom sealing film 7 are generally made of high-molecular polymer materials, preferably waterproof PET+PSA, which has the characteristics of high strength, good adhesion, good sealing performance, and long service life.

[0041] like Figure 1 and Figure 3 As shown, the mover assembly 3 includes a through hole 311 extending along the length direction X. The through hole 311 is used to accommodate the stator assembly 4, which can reduce the size of the linear motor. The mover assembly 3 reciprocates relative to the stator assembly 4 along the length direction X of the mover assembly 3, thereby realizing linear drive. The mover assembly 3 can generate driving force and provide vibration under the magnetic force of the coil 41.

[0042] like Figure 3 As shown, the mover assembly 3 includes an oscillator 31, two sets of magnets 32, and two elastic members 33. The oscillator 31 has a through hole 311, and the stator assembly 4 is accommodated in the through hole 311. The length of the through hole 311 is greater than the length of the stator assembly 4, which can prevent the mover assembly 3 from colliding with the stator assembly 4 during movement.

[0043] Two sets of magnets 32 are disposed within the through hole 311 and are positioned opposite each other on both sides of the width direction Y of the stator assembly 4, that is, on both sides perpendicular to the vibration direction. The magnets 32 can cooperate with the coil 41 to generate a driving magnetic field and provide vibration sensation, and high-performance magnets such as neodymium iron boron (NdFeB) are commonly used.

[0044] In other embodiments, a magnetic yoke / magnetic sheet is added around the permanent magnet to concentrate the magnet, optimize the magnetic field distribution, and improve efficiency. The magnet 32 ​​can be made of materials such as permanent magnets.

[0045] like Figure 3 As shown, the mover assembly 3 also includes two magnetic guide plates 34, disposed within the through hole 311 and positioned opposite each other on both sides of the stator assembly 4 in the width direction Y. Specifically, each magnetic guide plate 34 is disposed between the corresponding magnet 32 ​​and the side wall of the through hole 311. Optionally, the magnet 32 ​​and the magnetic guide plate 34 are fixedly connected by adhesive, and the magnetic guide plate 34 is fixedly connected to the inner wall of the through hole 311 by adhesive.

[0046] In one embodiment, the through hole 311 can be configured as an I-shape, with two sets of magnets 32 and two magnetic conductive plates 34 symmetrically assembled on both sides of the I-shaped through hole. The I-shaped through hole 311 makes the assembly and positioning of the magnets 32 and magnetic conductive plates 34 more precise and convenient, improving assembly efficiency.

[0047] like Figure 1 As shown, the linear motor also includes elastic elements 33, and the mover assembly 3 is connected to the inner wall of the upper housing 1 through the elastic elements 33. Specifically, two elastic elements 33 are respectively located at both ends of the mover assembly 3 (i.e., the oscillator 31) in the length direction X. The two elastic elements 33 allow the mover assembly 3 to move linearly and provide elastic restoring force to the mover assembly 3. The elastic elements 33 are all metal sheets or metal springs, usually stamped from conductive metals (such as phosphor bronze or stainless steel), and have good elasticity and conductivity.

[0048] In this embodiment, the elastic element 33 is a V-shaped spring sheet. The two elastic elements 33 have opposite opening directions when installed on both sides of the vibrator 31, so as to provide stable elastic force and improve the stability of vibration.

[0049] The elastic element 33 is mounted on the vibrator 31 via a first positioning piece 331, and is also mounted inside the upper shell 1 via a second positioning piece 332. The first positioning piece 331 presses the elastic element 33 against the vibrator 31, and is fixed to the elastic element 33 and the vibrator 31 by laser welding. The second positioning piece 332 presses the other end of the elastic element 33 against the upper shell 1, and is then fixed to the elastic element 33 and the upper shell 1 by laser welding.

[0050] like Figure 1 and Figure 4As shown, the linear motor also includes two damping elements 8, which are respectively disposed on the two side walls of the through hole 311 along the X direction. The two damping elements 8 are disposed opposite to the two ends of the stator assembly 4. The damping elements 8 can prevent the vibrator 31 from colliding with the axial end face of the iron core 42 and the pole shoes 43 provided at its end during the movement of the rotor assembly 3, thus preventing damage to the parts and playing a buffering role.

[0051] In another embodiment, the two damping elements 8 can also be respectively disposed at both ends of the stator assembly 4 in the length direction X. That is, the damping elements 8 are located on the outer side of the ends of the pole shoes 43 at both ends of the iron core (outer side of both ends of the heat sink 5), which can prevent the iron core 42, pole shoes 43 and oscillator 31 from colliding.

[0052] like Figure 1 As shown, the linear motor also includes a circuit board 9, which is used to electrically connect with the stator assembly 4 and the external control circuit to achieve vibration control. Specifically, part of the structure of the circuit board 9 is located within the accommodating cavity and is disposed on the lower shell 2, and is electrically connected to the stator assembly 4. The remaining part of the circuit board 9 extends outside the accommodating cavity and is connected to the external control circuit. Thus, the external control circuit supplies power to the stator assembly 4 through the circuit board 9, which can precisely control the current in the stator assembly 4, thereby achieving motion control of the mover assembly 3. The external control circuit is a control circuit board used in electronic devices such as mobile phones and tablets, thus enabling the application of the linear motor in electronic devices. The circuit board 9 can be a flexible circuit board or a printed circuit board, etc.

[0053] Optionally, the portion of the circuit board 9 located within the accommodating cavity can be configured as a flexible flat cable or an FPC board, which is bonded to the lower shell 2 with self-adhesive backing. The flexible flat cable or FPC board has pads and PAD positions, and the pads are soldered to the wire ends of the coil for conduction.

[0054] like Figure 1 , Figure 3 and Figure 4 As shown, the linear motor also includes a Hall sensor 12 and a magnet 13 paired with the Hall sensor 12. The magnet 13 is fixed to the outer wall of the mover assembly 3; specifically, the magnet 13 is fixed to the outer wall of the oscillator 31 along the width direction Y. The Hall sensor 12 is fixed to the circuit board 9, and the Hall sensor 12 and the magnet 13 are arranged opposite each other.

[0055] In this embodiment, the outer wall of the oscillator 31 is recessed inward to form a groove 312, and the magnet 13 is fixed in the groove 312, thereby reducing the volume of the outer upper shell 1 of the oscillator 31. The upper shell 1 is provided with a through hole 111, which is positioned opposite to the groove 312. When the circuit board 9 is fixed to the outside of the upper shell 1, the Hall sensor 12 on it is located at the position of the through hole 111, thereby being positioned opposite to the magnet 13.

[0056] The Hall sensor 12, based on the Hall effect, can detect changes in magnetic field non-contactly. When the mover assembly 3 moves, its magnet 13 passes through the Hall sensor 12, which detects the change in magnetic field strength and converts it into an electrical signal, feeding it back to the external control circuit. This allows the external control circuit to know the current position of the mover assembly 3 in real time and accurately, thus forming a "closed-loop control" system. The external control circuit can precisely adjust the output current based on the difference between the target position and the actual position of the mover assembly 3, ensuring that the linear motor can accurately stop at the specified position, achieving more stable, efficient, and reliable control.

[0057] like Figure 1 and Figure 4 As shown, the linear motor also includes connecting ears 10, which are fixed to the outside of the upper housing 1. The linear motor can be fixed inside the electronic device via the connecting ears 10. The connecting ears 10 are provided with mounting holes for fixing to the inside of the electronic device using screws or the like. Optionally, three connecting ears 10 are provided on the outside of the upper housing 1 to improve the stability of the connection and fixation. The connecting ears 10 are made of stainless steel, preferably SUS301. Made of 1 / 2H material or similar material, it features high hardness and strong support.

[0058] The linear motor supplies power to the circuit board 9, causing the coil to generate electromagnetic force. The electromagnetic force generated by the coil 41 interacts with the magnetic lines of force generated by the magnet 32, causing the mover assembly 3 to move in one direction under the driving force. When the mover assembly 3 moves to a certain position, the current direction on the coil 41 changes, causing the generated electromagnetic force to reverse, causing the mover assembly 3 to move in the opposite direction. This continuous change in the current direction causes the mover assembly 3 to reciprocate in the X direction inside the motor. When the frequency of the change in the current direction of the coil 41 is consistent with the natural frequency of the elastic element, the motor produces the maximum vibration sensation.

[0059] The linear motor in this embodiment optimizes the heat conduction path through a heat sink structure, significantly improving its thermal performance ceiling. The continuous steady-state power handling capacity of the linear motor is increased by 20% compared to the original linear motor, and the thermal shock resistance time under high load is extended by a substantial 69%. While maintaining a safe temperature, the linear motor in this embodiment can output greater continuous thrust and withstand more prolonged periods of intense acceleration and deceleration, thereby comprehensively enhancing the dynamic response capability and operational reliability of the equipment.

[0060] In this embodiment, the linear motor uses an injection molding process to form a heat sink on the outside of the coil, which increases the contact area between the heat sink and the coil, greatly improving the heat dissipation performance of the linear motor, avoiding overheating and frequency reduction, and improving the response speed of the linear motor.

[0061] Meanwhile, the heat sink is injection molded using liquid silicone injection molding and placed between the coil and the lower shell. This replaces adhesive bonding and eliminates the need for glue curing, simplifying the assembly process and improving quality control.

[0062] In addition, this application embodiment also provides an electronic device, which may include a housing, a control circuit board, and a linear motor. The housing serves as a protective structure for the electronic device. Detailed technical features of the linear motor are described in the foregoing embodiments and will not be repeated here. Optionally, the control circuit board and the linear motor are housed within the housing, and the control circuit board is electrically connected to circuit board 9 to control the operating state of the linear motor. Furthermore, detailed technical features of other parts of the electronic device's physical structure are within the understanding of those skilled in the art and will not be repeated here. This electronic device may be a mobile phone, tablet computer, laptop computer, or wearable device, etc.

[0063] This embodiment describes a linear motor in an electronic device, comprising an upper shell, a lower shell, a mover assembly, a stator assembly, and a heat sink. The upper and lower shells enclose a cavity, within which the mover assembly and stator assembly are disposed. The stator assembly includes an iron core, a coil sleeved on the iron core, and pole shoes located on both sides of the coil. The heat sink is injection molded onto the lower shell, specifically on the circumferential outer side of the coil and the outer side of the shaft ends of the pole shoes located at both ends of the iron core. The circumferential outer side of the pole shoes protrudes from the heat sink. By injection molding a heat sink connected to the lower shell on the circumferential outer side of the coil, this linear motor increases the contact area between the heat sink and the coil, thereby improving the heat dissipation performance and overall performance of the linear motor.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A linear motor, characterized in that, The linear motor includes: The upper and lower shells surround and form a accommodating cavity; The moving part assembly is disposed within the accommodating cavity; A stator assembly is disposed within the accommodating cavity. The stator assembly includes a coil, an iron core, and pole shoes. At least one coil and pole shoes located on both sides of the coil are sleeved on the iron core. A heat sink is injection molded onto the lower shell and onto the circumferential outer side of the coil and the outer side of the shaft end of the pole shoe located at both ends of the iron core, with the circumferential outer side of the pole shoe exposed from the heat sink.

2. The linear motor according to claim 1, characterized in that, The upper shell is provided with a first heat dissipation hole, and the lower shell is provided with a second heat dissipation hole. The positions of the first heat dissipation hole and the second heat dissipation hole correspond to the positions of the coil.

3. The linear motor according to claim 2, characterized in that, The linear motor also includes a top sealing film and a bottom sealing film. The top sealing film is adhered to the outer surface of the upper shell and covers the first heat dissipation hole, and the bottom sealing film is adhered to the outer surface of the lower shell and covers the second heat dissipation hole.

4. The linear motor according to claim 1, characterized in that, The moving part includes a through hole, the stator part is located in the through hole, and the moving part reciprocates relative to the stator part along the length direction of the moving part.

5. The linear motor according to claim 4, characterized in that, The moving part component includes: The oscillator has the through hole, and the stator assembly is housed within the through hole; Two sets of magnets are disposed within the through hole and are located opposite each other on both sides of the stator assembly in the width direction; Two elastic elements are disposed on both sides of the oscillator along its length, and the opening directions of the two elastic elements are opposite.

6. The linear motor according to claim 5, characterized in that, The mover assembly also includes two magnetic plates disposed within the through hole and located opposite each other on both sides of the stator assembly in the width direction, with each magnetic plate disposed between the corresponding magnet and the side wall of the through hole.

7. The linear motor according to claim 4 or 5, characterized in that, The linear motor also includes two damping elements, which are respectively disposed on the two side walls of the through hole in the length direction or respectively disposed at both ends of the stator assembly in the length direction.

8. The linear motor according to claim 5, characterized in that, The elastic element is mounted on the vibrator via a first positioning piece, and the elastic element is also mounted inside the upper shell via a second positioning piece.

9. The linear motor according to claim 1, characterized in that, The linear motor also includes a circuit board, a portion of which is located on the lower housing and electrically connected to the stator assembly, and a portion of which is located on the outer side of the upper housing and connected to an external control circuit.

10. The linear motor according to claim 1, characterized in that, The linear motor also includes a connecting lug, which is fixed to the outside of the upper housing.

11. The linear motor according to claim 9, characterized in that, The linear motor also includes a Hall sensor and a magnet paired with the Hall sensor. The magnet is fixed to the outer wall of the actuator assembly, and the Hall sensor is fixed to the circuit board and disposed opposite to the magnet.

12. The linear motor according to claim 1, characterized in that, The heat sink is made of thermally conductive silicone.

13. The linear motor according to claim 3, characterized in that, The materials of the top sealing film and the bottom sealing film are high molecular polymers.

14. An electronic device, characterized in that, The electronic device includes a housing, a control circuit board, and as claimed in claim 1. The linear motor according to any one of the 13 claims, wherein the control circuit board and the linear motor are disposed within the housing, and the control circuit board is electrically connected to the linear motor.

Images