Broadband linear vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a broadband linear vibration motor, which comprises a shell, a stator assembly, a rotor assembly and an elastic piece, the shell comprises a cylindrical middle frame with openings at two ends and end covers buckled at the openings at the two ends to form an accommodating space, the stator assembly is matched and fixed with the inner wall of the middle frame, and the rotor assembly is fixed with the inner wall of the middle frame. The elastic pieces are clamped and fixed between the middle frame and the end covers, the rotor assembly penetrates through the stator assembly at intervals and is elastically suspended in the containing space through the elastic pieces connected with the two ends of the rotor assembly, the stator assembly comprises a winding assembly and a flexible circuit board, the winding assembly comprises an integrated hollow winding frame and three coils which are wound on the winding frame and connected in series, and the flexible circuit board is arranged in the winding frame. The winding frame is matched and fixed with the inner wall of the middle frame, and the rotor assemblies penetrate through the winding frame at intervals. According to the broadband linear vibration motor, the three coils connected in series are fixed through the reel, so that the stator assembly is convenient to assemble and high in mechanical reliability, and the broadband linear vibration motor is large in vibration quantity, short in response time and strong in driving force.

Description

Technical Field

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

[0002] With the development of electronic technology, portable consumer electronics products have gradually occupied the global consumer market, such as mobile phones, handheld game consoles, and multimedia entertainment devices. These electronic products generally use linear vibration motors for haptic feedback, such as incoming call notifications on mobile phones and vibration feedback on game consoles. To meet such a wide range of applications, the requirements for miniaturization and vibration performance of linear vibration motors are becoming increasingly stringent.

[0003] Existing linear vibration motors typically include horizontal linear vibration motors (not shown), comprising an annular housing with openings at both ends, a cover fastened to the openings at both ends of the housing, an oscillator assembly, a stator assembly, and an elastic element. The housing and cover fasten together to form an accommodating space. The stator assembly is fixed to the housing, and one end of the elastic element connects to both sides of the oscillator assembly, while the other end connects to the inner wall of the housing, thus suspending the oscillator assembly within the accommodating space. The oscillator assembly and the stator assembly are spaced apart within the accommodating space. The stator assembly includes a coil and a flexible circuit board, through which power is supplied to the coil. The oscillator assembly includes a magnet and a mass block. When the coil is energized, a magnetic field is generated and interacts with the magnet, causing the oscillator assembly to reciprocate and generate vibration through the mass block. The strength of the vibration and the response speed during vibration determine the quality of the vibration experience. Fast response and stronger vibration have become the goals pursued by vibration element products. Existing linear vibration motors cannot generate a sufficiently strong magnetic field through a single coil, which easily leads to a small driving force in the existing linear motor structure. The magnitude of the driving force directly determines the vibration amount and response time. Insufficient vibration and slow response time result in an inability to create a rich vibration experience.

[0004] Therefore, there is an urgent need for a linear vibration motor with large vibration amplitude and fast response time to solve the technical problems of existing vibration motors. Utility Model Content

[0005] The purpose of this utility model is to provide a wideband linear vibration motor with large vibration amplitude and fast response time. The specific technical solution is as follows:

[0006] A wideband linear vibration motor includes a housing, a stator assembly, a mover assembly, and an elastic element. The housing includes a cylindrical middle frame with openings at both ends and end caps that fasten to the openings at both ends to form an accommodating space. The stator assembly is adapted to and fixed to the inner wall of the middle frame. The elastic element clamps and fixes the mover assembly between the middle frame and the end caps. The mover assembly extends through the stator assembly and is elastically suspended in the accommodating space by the elastic element connecting its two ends. The stator assembly includes a winding assembly and a flexible circuit board. The winding assembly includes an integral hollow winding frame and three coils connected in series wound on the winding frame. The winding frame is adapted to and fixed to the inner wall of the middle frame, and the mover assembly extends through the winding frame.

[0007] Preferably, the flexible circuit board includes an internal power terminal and an external power terminal. The internal power terminal is fixed to the winding frame and electrically connected to the coil. The external power terminal extends from the winding frame into the accommodating space and is fixed to the outer wall of the end cover.

[0008] Preferably, the outer peripheral surface of the winding frame includes three annular winding grooves for accommodating the coil, a lead groove along the length of the winding frame and penetrating the winding grooves, a connecting groove located at one end of the winding frame and fixing the internal power terminal, and a winding post located at the other end of the winding frame. The winding grooves, lead grooves and connecting grooves are connected in a manner.

[0009] Preferably, the winding groove forms four spaced annular ribs on the outer circumference of the winding frame, the connecting groove is recessed in one end of the rib of the winding frame, and the winding post is spaced out on the rib of the other end of the winding frame, the height of the winding post is less than or equal to the height of the rib.

[0010] Preferably, the two free ends of the winding frame have symmetrically recessed positioning grooves.

[0011] Preferably, the middle frame includes two symmetrical flat portions and two curved portions, with first notches symmetrically arranged at the free ends of the two flat portions, and second notches arranged at the free ends of the two curved portions in relation to one of the positioning grooves.

[0012] Preferably, the moving part assembly includes a magnet and mass blocks fixed to both sides of the magnet; the width of the magnet corresponds to the width of the three coils, and the two end faces of the mass blocks are integrally provided with connecting portions for connecting the elastic element.

[0013] Preferably, the mover assembly includes a pole piece, magnets fixed on both sides of the pole piece, mass blocks fixed on both sides of the magnets, and a connector with one end penetrating through the mass blocks and connected and fixed to the magnets; the other end of the connector protrudes from both end faces of the mass blocks and is connected to the elastic element.

[0014] Preferably, the depth of the lead groove is greater than the depth of the winding groove.

[0015] Preferably, a wire-blocking post is provided at a position adjacent to the connecting groove and the lead wire groove, and the height of the wire-blocking post is less than or equal to the height of the protruding rib.

[0016] Compared with the prior art, this utility model provides a wideband linear vibration motor with large vibration and fast response time. By increasing the number of coils and connecting them in series, and increasing the volume of the magnet to correspond to the coils, the magnetic field strength is increased, thereby improving the vibration and response time and increasing the driving force of the linear motor. By fixing the coils with a winding frame, the stator assembly is easy to assemble and has high mechanical reliability, thus allowing consumers to experience a better vibration. Attached Figure Description

[0017] Figure 1 This is a 3D view of the assembly of a broadband linear vibration motor.

[0018] Figure 2 This is an exploded view of the structure of a broadband linear vibration motor.

[0019] Figure 3 This is an exploded view of the moving part component in the first embodiment.

[0020] Figure 4 This is a cross-sectional view of the broadband linear vibration motor in the vibration direction according to the first embodiment.

[0021] Figure 5 This is an exploded view of the stator assembly in the second embodiment.

[0022] Figure 6 This is a cross-sectional view of the broadband linear vibration motor in the vibration direction according to the third embodiment.

[0023] Figure 7 This is a perspective view of the winding frame in the fourth embodiment.

[0024] in:

[0025] 100 - Housing;

[0026] 1-Middle frame; 10-First notch; 11-Second notch;

[0027] 2-Cap;

[0028] 3-Stator assembly; 30-Flexible circuit board; 31-Coil; 32-Winding frame; 320-Winding slot; 321-Connecting slot; 322-Lead slot; 323-Winding post; 324-Positioning slot; 325-Wire stop post;

[0029] 4-Motor assembly; 40-Magnet; 41-Mass block; 410-Connecting part; 42-Connecting piece; 43-Pole plate;

[0030] 5-Elastic component;

[0031] 6-Damping components. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The structure of a wideband linear vibration motor according to the first embodiment of this utility model is as follows: Figures 1 to 4 As shown, the device includes a housing 100, a stator assembly 3, a mover assembly 4, and an elastic element 5. The housing 100 includes a cylindrical inner frame 1 with openings at both ends (not shown) and an end cap 2 that is fastened to the openings at both ends to form an accommodating space (not shown). The inner frame 1 includes symmetrical two flat portions (not shown) and two curved portions (not shown). The stator assembly 3 is adapted to and fixed to the inner wall of the inner frame 1. The elastic element 5 is clamped and fixed between the inner frame 1 and the end cap 2. The mover assembly 4 passes through the stator assembly 3 at intervals and is elastically suspended in the accommodating space by the elastic element 5 connecting its two ends.

[0034] The stator assembly 3 includes a flexible circuit board 30 and a winding assembly (not shown). The winding assembly includes an integrated hollow winding frame 32 and three coils 31 connected in series wound on the winding frame 32. The winding frame 32 is adapted to and fixed to the inner wall of the middle frame 1. The mover assembly 4 passes through the winding frame 32 at intervals. The flexible circuit board 30 includes an internal power terminal 300 and an external power terminal 301. The internal power terminal 300 is fixed to the winding frame 32 and electrically connected to the coils 31. The external power terminal 301 extends from the winding frame 32 to accommodate space and is fixed to the outer wall of the end cover 2. The outer peripheral surface of the winding frame 32 includes three annular winding grooves 320 for accommodating coils 31, a lead groove 322 extending along the length of the winding frame 32 and penetrating through the winding grooves 320, a connecting groove 321 located at one end of the winding frame 32 and fixing the internal electrical terminal 300, and a winding post 323 located at the other end of the winding frame 32. The winding grooves 320, lead grooves 322, and connecting grooves 321 are interconnected. The winding grooves 320 form four spaced annular ribs (not shown) on the outer peripheral surface of the winding frame 32. The connecting grooves 321 are recessed on the ribs at one end of the winding frame 32, and the winding posts 323 are spaced out in the ribs at the other end of the winding frame 32. The ribs of the winding frame 32 are adapted to and fixed to the inner wall of the middle frame 1. The height of the winding posts 323 is... The height is less than or equal to the height of the rib to ensure the stability of the rib fixed to the inner wall of the middle frame 1 and to ensure the mechanical reliability of the linear vibration motor. The starting end of the coil 31's wire harness (not shown) is electrically connected to the internal power terminal 300 in the connecting groove 321. The coil 31's wire harness starts from the lead groove 322 connected to the connecting groove 321. The lead groove 322 is open for the wire harnesses of three coils 31 connected in series to run and wind to the adjacent winding groove 320. When the coil 31's wire harness is wound in the third winding groove 320, the winding post 323 is used to wind the coil 31's wire harness back to the lead groove 322 and finally electrically connect the end of the coil 31's wire harness to the internal power terminal 300 fixed in the connecting groove 321. A first notch 10 is symmetrically provided on both free ends of the flat portion of the middle frame 1. The first notch 10 is used to provide space for the external power terminal 301 to extend outside the end cover 2 for external power supply. In this embodiment, the coil 31 is fixed by the winding frame 32, which makes the assembly of the stator assembly 3 convenient and mechanically reliable.

[0035] The mover assembly 4 includes a magnet 40 and mass blocks 41 fixed to both sides of the magnet 40. The width of the magnet 40 corresponds to the width of the three coils 31 to increase the magnetic field strength, improve the vibration and response time of the linear motor, and increase the driving force of the linear motor. Connecting portions 410 of the elastic elements 5 are integrally protruded from both end faces of the mass blocks 41. The connecting portions 410 improve the connection strength, resulting in high mechanical reliability of the mover assembly 4. In this invention, the coils 31 are spaced around the outside of the magnet 40. When the coils 31 are energized, they generate a magnetic field, driving the mover assembly 4 with the magnet 40 to move linearly. The coils are then reset by the rebound force of the elastic elements 5. During this reciprocating motion, the mover assembly 4 vibrates.

[0036] The structure of a wideband linear vibration motor according to the second embodiment of this utility model is as follows: Figure 5 As shown, based on the first embodiment, the two free ends of the winding frame 32 are symmetrically recessed with positioning grooves 324, and the two free ends of the curved part of the middle frame 1 are provided with second notches 11 corresponding to the positioning grooves 324. The position of the stator assembly 3 on the middle frame 1 can be monitored and adjusted through the second notches 11, thereby improving the mechanical reliability of the vibration motor and optimizing the vibration performance.

[0037] The structure of a wideband linear vibration motor according to the third embodiment of this utility model is as follows: Figure 6 As shown, as an alternative to the first embodiment, the mover assembly 4 includes a pole piece 43, magnets 40 fixed on both sides of the pole piece 43, mass blocks 41 fixed on both sides of the magnets 40, and a connector 42 with one end penetrating the mass block 41 and connected to the magnets 40. The other end of the connector 42 protrudes from both end faces of the mass block 41 and is connected to the elastic member 5. In this embodiment, the whole magnet in the first embodiment is divided into two spaced pieces, with the magnetically conductive pole piece 43 replacing it in the middle. This saves the cost of the linear mover assembly 4 without affecting the magnetic field. Normally, the mass block 41 is made of tungsten alloy, which is expensive. In this embodiment, the connecting part 410, which is integrally protruding from the mass block 41 in the first embodiment, is replaced by a separate stainless steel connector 42. This not only reduces the cost but also strengthens the welding strength between the connector 42 and the elastic member 5, improves the mechanical reliability of the vibration motor, and optimizes the vibration performance.

[0038] The structure of a wideband linear vibration motor according to the fourth embodiment of this utility model is as follows: Figure 7As shown, based on the first embodiment, the depth of the winding groove 320 is greater than the depth of the winding groove, which can avoid the coil 31 in the wire harness and improve the space utilization of the winding frame 32. More preferably, a wire-blocking post 325 is set at the position adjacent to the connecting groove 321 and the lead wire groove 322 to position the end of the coil 31 wire harness to be electrically connected to the internal electrical terminal 300 fixed in the connecting groove 321, thereby improving the mechanical reliability of the vibration motor and optimizing the vibration performance. The height of the wire-blocking post 325 is less than or equal to the height of the rib to ensure the stability of the rib fixed to the inner wall of the middle frame 1 and ensure the mechanical reliability of the linear vibration motor.

[0039] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wide-frequency linear vibration motor, comprising a housing, a stator assembly, a mover assembly, and an elastic element, wherein the housing includes a cylindrical middle frame with openings at both ends and end caps that fasten to the openings at both ends to form an accommodating space; the stator assembly is adapted to and fixed to the inner wall of the middle frame; the elastic element is clamped and fixed between the middle frame and the end caps; the mover assembly extends through the stator assembly and is elastically suspended within the accommodating space by the elastic element connecting its two ends, characterized in that... The stator assembly includes a winding assembly and a flexible circuit board. The winding assembly includes an integrated hollow winding frame and three coils connected in series wound on the winding frame. The winding frame is adapted to and fixed to the inner wall of the middle frame. The moving part assembly passes through the winding frame at intervals.

2. The wideband linear vibration motor according to claim 1, characterized in that, The flexible circuit board includes an internal power terminal and an external power terminal. The internal power terminal is fixed to the winding frame and electrically connected to the coil. The external power terminal extends from the winding frame into the accommodating space and is fixed to the outer wall of the end cover.

3. The wideband linear vibration motor according to claim 2, characterized in that, The outer peripheral surface of the winding frame includes three annular winding slots for accommodating the coil, a lead slot along the length of the winding frame and penetrating the winding slots, a connecting slot located at one end of the winding frame and fixing the internal electrical terminal, and a winding post located at the other end of the winding frame. The winding slots, lead slots and connecting slots are connected.

4. The wideband linear vibration motor according to claim 3, characterized in that, The winding groove forms four spaced annular ribs on the outer circumference of the winding frame. The connecting groove is recessed in one end of the rib of the winding frame. The winding post is spaced out on the rib of the other end of the winding frame. The height of the winding post is less than or equal to the height of the rib.

5. The wideband linear vibration motor according to claim 4, characterized in that, The two free ends of the winding frame have symmetrical recessed positioning grooves.

6. The wideband linear vibration motor according to claim 5, characterized in that, The middle frame includes two symmetrical flat portions and two curved portions. The two free ends of the flat portions are symmetrically provided with first notches, and the two free ends of the curved portions are provided with second notches corresponding to a positioning groove.

7. The wideband linear vibration motor according to claim 6, characterized in that, The moving part assembly includes a magnet and mass blocks fixed to both sides of the magnet; the width of the magnet is set to correspond to the width of the three coils; the two end faces of the mass blocks are integrally provided with connecting parts for connecting the elastic element.

8. The wideband linear vibration motor according to claim 6, characterized in that, The moving part assembly includes a pole piece, magnets fixed on both sides of the pole piece, mass blocks fixed on both sides of the magnets, and a connector with one end penetrating through the mass block and connected and fixed to the magnets. The other end of the connector protrudes from both end faces of the mass block and is connected to the elastic element.

9. The wideband linear vibration motor according to claim 8, characterized in that, The depth of the lead groove is greater than the depth of the winding groove.

10. The wideband linear vibration motor according to claim 9, characterized in that, A wire-blocking post is provided at the position adjacent to the connecting groove and the lead wire groove, and the height of the wire-blocking post is less than or equal to the height of the protruding rib.

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