Vibration motor

Abstract

The invention provides a vibration motor, which comprises a hollow shell, a vibrator assembly accommodated in the shell, a stator assembly and an elastic piece, and is characterized in that the shell comprises an inner wall facing the vibrator assembly, the stator assembly is fixed on the inner wall, and the stator assembly drives the vibrator assembly to reciprocate along a first direction; the stator assembly comprises a driving coil; the vibrator assembly comprises a magnetic steel unit which is arranged opposite to the driving coil at an interval and two mass blocks which are respectively fixed at two opposite ends of the magnetic steel unit along the first direction; the ends, away from the magnetic steel units, of the mass blocks are fixedly connected with the elastic pieces. The drive coils drive the magnetic steel units to reciprocate in the first direction after being powered on. The vibration motor further comprises a hollow cylindrical copper framework fixed on the inner wall, the driving coil is wound on the peripheral side of the copper framework, and the magnetic steel unit is accommodated in the copper framework and is separated from the copper framework. Compared with the prior art, the vibration motor is small in damping effect difference along with temperature change, stable in damping effect and higher in product strength.

Description

Technical field

[0001] The present invention relates to the technical field of motors, and in particular to a vibration motor. [Background Technology]

[0002] With the advancement of electronic technology, portable consumer electronics are becoming increasingly popular, such as mobile phones, handheld game consoles, navigation devices, and handheld multimedia entertainment devices. These electronic products generally use vibration motors for system feedback, such as incoming call notifications, message notifications, navigation notifications on mobile phones, and vibration feedback on game consoles. Such a wide range of applications requires vibration motors with excellent performance and long service life.

[0003] In related technology, a vibration motor includes a housing, a vibrator, a stator, and an LCP (Liquid Crystal Polymer) plastic frame. The plastic frame is fixed within the housing, the stator is fixed to the plastic frame, and the vibrator is spaced inside the plastic frame, allowing the vibrator to move between the housing and the stator. During this movement, damping is required to slow the vibrator's movement. By adopting magnetic fluid damping, magnetic fluid is added between the vibrator and the frame. During the movement of the stator, friction damping is generated between the vibrator, the magnetic fluid, and the plastic frame.

[0004] However, the aforementioned magnetic fluid is unstable. Its damping effect weakens in low-temperature environments, and its damping effect fluctuates with temperature, making it difficult to inject the magnetic fluid. Furthermore, the plastic frame is structurally weak, shortening the lifespan of the vibration motor over extended periods.

[0005] Therefore, it is necessary to provide a new vibration motor to solve the above technical problems. [Summary of the invention]

[0006] The object of the present invention is to provide a vibration motor with a smaller difference in damping effect with temperature change, a stable damping effect and a higher product strength.

[0007] To achieve the above objectives, an embodiment of the present invention provides a vibration motor, comprising a hollow housing, a vibrator assembly housed within the housing, a stator assembly spaced apart around the vibrator assembly, and an elastic member elastically suspending the vibrator assembly on the housing, wherein the housing includes an inner wall facing the vibrator assembly, the stator assembly is fixed to the inner wall, and the stator assembly drives the vibrator assembly to reciprocate in a first direction;

[0008] The stator assembly includes a drive coil;

[0009] The vibrator assembly includes a magnetic steel unit spaced apart from the driving coil and two mass blocks fixed to opposite ends of the magnetic steel unit along the first direction; one end of the mass block away from the magnetic steel unit is fixedly connected to the elastic member, and the driving coil drives the magnetic steel unit to reciprocate along the first direction when energized;

[0010] The vibration motor further includes a hollow cylindrical copper frame fixed to the inner wall, the driving coil is wound around the outer circumference of the copper frame, and the magnetic steel unit is accommodated in the copper frame and spaced apart from the copper frame.

[0011] Preferably, the copper skeleton includes a hollow cylindrical skeleton body fixed to the inner wall, and the copper skeleton is also provided with a winding groove formed by a depression on one side of the skeleton body close to the shell and extending along its circumference; the drive coil is wound in the winding groove.

[0012] Preferably, the winding groove comprises a first winding groove, a second winding groove and a third winding groove which are sequentially spaced apart along the axial direction thereof;

[0013] The copper skeleton further includes a first avoidance position connecting the first winding groove and the second winding groove and a second avoidance position connecting the second winding groove and the third winding groove;

[0014] The driving coil includes a first coil, a second coil and a third coil respectively wound in the first winding groove, the second winding groove and the third winding groove; the connection point between the first coil and the second coil is located in the first avoidance position, and the connection point between the second coil and the third coil is located in the second avoidance position.

[0015] Preferably, the driving coil is wound by a wire from one side of the first winding groove in a clockwise direction along the circumference of the skeleton body in one or three layers, and then wound into the second winding groove through the first avoidance position, and wound into the counterclockwise direction along the circumference of the skeleton body in one or three layers, and then wound from the second avoidance position into the third winding groove, and wound into four layers in a clockwise direction along the circumference of the skeleton body, after winding four layers in the third winding groove, it passes through the second avoidance and winds the second winding groove into the second winding groove with a total of four layers, and then passes through the first avoidance position and winds the first winding groove into the first winding groove with a total of four layers before the wire is output, thereby completing the winding of the first coil, the second coil and the third coil.

[0016] Preferably, the magnetic steel unit includes a first pole core, a first magnetic steel, a second pole core, a second magnetic steel and a third pole core stacked in sequence on the first pole core; the side of the first pole core away from the first magnetic steel is fixed to one of the mass blocks, and the side of the third pole core away from the second magnetic steel is fixed to the other mass block.

[0017] Preferably, the first magnetic steel and the second magnetic steel are both magnetized along the first direction and in opposite directions.

[0018] Preferably, the housing comprises a hollow outer shell and a first end cover and a second end cover fixed to opposite ends of the outer shell; the copper skeleton is fixed to the inner wall of the outer shell;

[0019] The elastic member includes a first elastic member and a second elastic member arranged opposite to each other; the side of the first elastic member close to the first end cover is clamped and fixed between the first end cover and the outer shell, and the side of the first elastic member away from the first end cover is fixed to one of the mass blocks; the side of the second elastic member close to the second end cover is clamped and fixed between the second end cover and the outer shell, and the side of the second elastic member away from the second end cover is fixed to the other mass block.

[0020] Preferably, the vibration motor further includes a conductive member, which is fixed to the copper skeleton and electrically connected to the drive coil.

[0021] Preferably, the copper skeleton further includes a mounting groove formed by a side of the skeleton body close to the shell being recessed in a direction close to the magnetic steel unit; the mounting groove is spaced apart from the winding groove, and the conductive member is fixed in the mounting groove.

[0022] Compared with the related art, the vibration motor of the present invention is characterized in that the stator assembly is arranged in a shell, the vibrator assembly is arranged at intervals in the stator assembly, the elastic member is used to elastically suspend the vibrator assembly in the shell, the shell includes an inner wall facing the vibrator assembly, the stator assembly is fixed to the inner wall, and the stator assembly drives the vibrator assembly to reciprocate along a first direction; the vibrator assembly includes a magnetic steel unit arranged at a relative interval with the driving coil and two mass blocks respectively fixed at opposite ends of the magnetic steel unit along the first direction; one end of the mass block away from the magnetic steel unit is fixedly connected to the elastic member, and the driving coil drives the magnetic steel unit to reciprocate along the first direction after being energized. The vibration motor further comprises a hollow cylindrical copper skeleton fixed to the inner wall, a driving coil wound around the outer peripheral side of the copper skeleton, and a magnetic steel unit housed in the copper skeleton and spaced apart from the copper skeleton; after the driving coil is energized, the magnetic steel unit is driven to reciprocate in the first direction, and a magnetic field is generated by the magnetic steel unit. When the vibrator assembly moves axially, the magnetic field passes through the copper skeleton, and the induced electrons generated in the copper skeleton generate a magnetic field opposite to that of the magnetic steel of the vibrator assembly to slow down the axial movement of the vibrator. That is, the kinetic energy of the vibrator is converted into electrical energy in the copper skeleton, thereby generating a damping effect and slowing down the axial movement of the vibrator.

Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0024] Figure 1 A schematic structural diagram of a vibration motor provided in the first embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the exploded structure of the vibration motor provided in the first embodiment of the present invention;

[0026] Figure 3 for Figure 1 AA line cross-sectional view;

[0027] Figure 4 A schematic structural diagram of a copper skeleton of a vibration motor provided in Example 1 of the present invention;

[0028] Figure 5 This is a schematic structural diagram of the copper skeleton of the vibration motor provided in the second embodiment of the present invention.

[0029] In the figure, 100, vibration motor, 1, shell, 11, outer shell, 12, first end cover, 13, second end cover, 2, stator assembly, 21, driving coil, 3, vibrator assembly, 31, magnetic steel unit, 311, first pole core, 312, first magnetic steel, 313, second pole core, 314, second magnetic steel, 315, third pole core, 32, mass block, 4, elastic member, 41, first elastic member, 411, first fixing portion, 412, second fixing portion, 413, elastic portion, 42, second elastic member, 5, copper skeleton, 51, skeleton body, 52, winding groove, 521, first winding groove, 522, second winding groove, 523, third winding groove, 53, first avoidance position, 54, second avoidance position, 6, mounting groove, 7, conductive member, 8, through hole. [Specific implementation method]

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figures 1-4 As shown, an embodiment of the present invention provides a vibration motor 100, which includes a hollow shell 1, a vibrator assembly 3 accommodated in the shell, a stator assembly 2 spaced apart around the vibrator assembly 3, and an elastic member 4 elastically suspending the vibrator assembly 3 on the shell 1, the shell 1 includes an inner wall facing the vibrator assembly 3, the stator assembly is fixed to the inner wall, and the stator assembly 2 drives the vibrator assembly 3 to reciprocate along a first direction; the stator assembly 2 includes a driving coil 21.

[0033] The vibrator assembly 3 includes a magnetic steel unit 31 spaced apart from the driving coil 21 and two mass blocks 32 fixed to opposite ends of the magnetic steel unit 31 along the first direction; the ends of the mass blocks 32 away from the magnetic steel unit 31 are fixedly connected to the elastic member 4. When the driving coil 21 is energized, the magnetic steel unit 31 is driven to reciprocate along the first direction. With the mass blocks 32 mounted on opposite ends of the magnetic steel unit 31, when the vibrator assembly 3 is driven by the driving coil 21,

[0034] The vibration motor 100 also includes a hollow, cylindrical copper frame 5 fixed to the inner wall. The drive coil 21 is wound around the outer periphery of the copper frame 5, which is fixed thereto. The magnetic steel unit 31 is housed within the copper frame 5 and spaced from the copper frame 5. By using the copper frame 5 to support and mount the drive coil 21, copper is non-magnetic, and the vibrator assembly 3 and the copper frame 5 do not attract or repel each other. However, the magnetic field generated by the magnetic steel unit 31 of the vibrator assembly 3 passes through the copper frame 5, generating an induced electromotive force, thereby generating induced electrons. The flow of induced electrons generates a magnetic field. When the drive coil 21 is energized, it drives the magnetic steel unit 31 in an axial direction, generating a magnetic field. When the vibrator assembly 3 moves axially, the magnetic field passes through the copper frame 5. The induced electrons generated within the copper frame 5 generate a magnetic field opposite to that of the magnetic steel of the vibrator assembly 3, slowing the vibrator's axial motion. In other words, the vibrator's kinetic energy is converted into electrical energy within the copper frame 5, thereby producing a damping effect and slowing the vibrator's axial motion.

[0035] In this embodiment, the copper skeleton 5 includes a hollow cylindrical skeleton body 51 fixed to the inner wall. The copper skeleton 5 is also provided with an annular winding groove 52 extending circumferentially thereof, formed by a recess on one side of the skeleton body 51 near the housing 1. The drive coil 21 is wound within the winding groove 52. The outer circumference of the skeleton body 51 is fixed to the housing 1, and the drive coil 21 is sleeved within the winding groove 52 of the skeleton body 51, facilitating the installation and fixation of the drive coil 21.

[0036] Among them, by winding the driving coil 21 in the winding groove 52, the driving coil 21 cuts the magnetic field generated by the magnetic steel unit 31 of the vibrator assembly 3 after being energized, thereby generating a Lorentz force, that is, an Ampere force, thereby pushing the vibrator assembly 3 to move in the axial direction; in addition, the direction of the current is periodically changed, so that the vibrator assembly 3 produces reciprocating motion in the axial direction, thereby improving the vibration performance of the vibration motor 100.

[0037] In this embodiment, the magnetic steel unit 31 includes a first pole core 311, a first magnetic steel 312, a second pole core 313, a second magnetic steel 314, and a third pole core 315, which are sequentially stacked on the first pole core 311. The side of the first pole core 311 facing away from the first magnetic steel 312 is fixed to one of the mass blocks 32, and the side of the third pole core 315 facing away from the second magnetic steel 314 is fixed to the other of the mass blocks 32. The arrangement of the first magnetic steel 312 and the second magnetic steel 314 enhances the overall magnetic pole performance of the magnetic steel unit 31. The first pole core 311, the second pole core 313, and the third pole core 315, respectively, are arranged on either side of the first magnetic steel 312 and the second magnetic steel 314, further enhancing the magnetic field of the vibrator assembly 3. In this embodiment, the first magnetic steel 312 and the second magnetic steel 314 are both magnetized in the first direction and in opposite directions. This facilitates periodic changes in the direction of the current flowing through the drive coil 21, causing the vibrator assembly 3 to reciprocate in the axial direction, thereby improving the vibration performance of the vibration motor 100. The magnetic poles of the first magnetic steel 312 and the second magnetic steel 314 on the side adjacent to each other are both N poles, and the magnetic poles of the first magnetic steel 312 and the second magnetic steel 314 on the side away from each other are both S poles. Optionally, the magnetic poles of the first magnetic steel 312 and the second magnetic steel 314 can also be opposite, which is not described here.

[0038] In this embodiment, the housing 1 includes a hollow outer shell 11 and a first end cap 12 and a second end cap 13 fixed to opposite ends of the outer shell 11. The copper skeleton 5 is fixed to the inner wall of the outer shell 11. The outer shell 11 is used to mount and fix the copper skeleton 5, facilitating the installation of the drive coil 21.

[0039] The elastic member 4 includes a first elastic member 41 and a second elastic member 42 disposed opposite each other. The first elastic member 41 is sandwiched and fixed between the first end cap 12 and the housing 11 on its side near the first end cap 12, while the first elastic member 41 is fixed to one of the mass blocks 32 on its side away from the first end cap 12. The second elastic member 42 is sandwiched and fixed between the second end cap 13 and the housing 11 on its side near the second end cap 13, while the second elastic member 42 is fixed to the other of the mass blocks 32 on its side away from the second end cap 13. By fixing the first elastic member 41 and the second elastic member 42 to opposite ends of the vibrator assembly 3, good elastic recovery performance can be provided, thereby enhancing the vibration effect of the vibrator assembly 3.

[0040] In this embodiment, the vibration motor 100 further includes a conductive member 7, which is fixed to the copper skeleton 5 and electrically connected to the drive coil 21. The conductive member 7 facilitates connection to an external power source for powering the drive coil 21. The optional external power source may be an external circuit or a battery. The conductive member 7 may be a flexible printed circuit board (FPC), which has properties such as bendability, foldability, and stretchability and is widely used.

[0041] In this embodiment, the housing 11 is further provided with a plurality of through holes 8 at intervals, and the through holes 8 are used for the conductive member 7 to connect to the external environment.

[0042] In this embodiment, the copper skeleton 5 further includes a mounting groove 6 formed by a side of the skeleton body 51 close to the housing 1 and recessed toward the magnetic steel unit 31. The mounting groove 6 is spaced apart from the winding groove 52, and the conductive member 7 is fixed within the mounting groove 6. This facilitates the installation of the conductive member 7 and saves installation space.

[0043] Example 2

[0044] See also Figure 1-Figure 5 As shown, in this embodiment, the structure of Example 2 is basically the same as that of Example 1, the difference being that Example 1 is a single-coil structure, and Example 2 is a three-coil winding structure. Three winding slots 52 form a coil, and one wire is wound around the three winding slots 52 at the same time. Specifically, the winding slots 52 include a first winding slot 521, a second winding slot 522, and a third winding slot 523 which are arranged in sequence along the axial direction thereof.

[0045] The copper skeleton 5 further includes a first avoidance position 53 connecting the first winding groove 521 and the second winding groove 522 , and a second avoidance position 54 connecting the second winding groove 522 and the third winding groove 523 .

[0046] The driving coil 21 includes a first coil, a second coil, and a third coil (the first to third coils are not shown in the figure) wound in the first winding groove 521, the second winding groove 522, and the third winding groove 523, respectively; the connection between the first coil and the second coil is located in the first avoidance position 53, and the connection between the second coil and the third coil is located in the second avoidance position 54. The first avoidance position 53 and the second avoidance position 54 facilitate the winding of the first coil, the second coil, and the third coil. By forming the first coil, the second coil, and the third coil with one wire, the electromagnetic induction effect generated by the magnetic steel unit 31 of the vibrator assembly 3 is better, and the vibration effect is good.

[0047] In this embodiment, the drive coil 21 is wound with a single wire from one side of the first winding groove 521 in a clockwise direction along the circumference of the skeleton body 51 in one or three layers, then wound through the first avoidance position 53 into the second winding groove 522 and wound in a counterclockwise direction along the circumference of the skeleton body 51 in one or three layers, then wound from the second avoidance position 54 into the third winding groove 523 and wound in a clockwise direction along the circumference of the skeleton body 51 in four layers, after winding four layers in the third winding groove 523 through the second avoidance position 54, then wound into the second winding groove 522 through the second avoidance position 54, winding the second winding groove 522 with four layers, then winding into the first winding groove 521 through the first avoidance position 53, winding the first winding groove 521 with four layers, and then exiting the wire, thus completing the winding of the first coil, the second coil, and the third coil. The winding method is simple and cost-effective.

[0048] Compared with the related art, the vibration motor of the present invention is characterized in that the stator assembly is arranged in a shell, the vibrator assembly is arranged at intervals in the stator assembly, the elastic member is used to elastically suspend the vibrator assembly in the shell, the shell includes an inner wall facing the vibrator assembly, the stator assembly is fixed to the inner wall, and the stator assembly drives the vibrator assembly to reciprocate along a first direction; the vibrator assembly includes a magnetic steel unit arranged at a relative interval with the driving coil and two mass blocks respectively fixed at opposite ends of the magnetic steel unit along the first direction; one end of the mass block away from the magnetic steel unit is fixedly connected to the elastic member, and the driving coil drives the magnetic steel unit to reciprocate along the first direction after being energized. The vibration motor further comprises a hollow cylindrical copper skeleton fixed to the inner wall, a driving coil wound around the outer peripheral side of the copper skeleton, and a magnetic steel unit housed in the copper skeleton and spaced apart from the copper skeleton; after the driving coil is energized, the magnetic steel unit is driven to reciprocate in the first direction, and a magnetic field is generated by the magnetic steel unit. When the vibrator assembly moves axially, the magnetic field passes through the copper skeleton, and the induced electrons generated in the copper skeleton generate a magnetic field opposite to that of the magnetic steel of the vibrator assembly to slow down the axial movement of the vibrator. That is, the kinetic energy of the vibrator is converted into electrical energy in the copper skeleton, thereby generating a damping effect and slowing down the axial movement of the vibrator.

[0049] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A vibration motor comprising a hollow housing, a vibrator assembly housed within the housing, a stator assembly spaced apart around the vibrator assembly, and an elastic member elastically suspending the vibrator assembly from the housing, the housing including an inner wall facing the vibrator assembly, the stator assembly being fixed to the inner wall, and the stator assembly driving the vibrator assembly to reciprocate in a first direction; The stator assembly includes a drive coil; The vibrator assembly includes a magnetic steel unit spaced apart from the driving coil and two mass blocks fixed to opposite ends of the magnetic steel unit along the first direction; one end of the mass block away from the magnetic steel unit is fixedly connected to the elastic member, and the driving coil drives the magnetic steel unit to reciprocate along the first direction after being energized; characterized in that The vibration motor further includes a hollow cylindrical copper frame fixed to the inner wall, the driving coil is wound around the outer circumference of the copper frame, and the magnetic steel unit is accommodated in the copper frame and spaced apart from the copper frame.

2. The vibration motor according to claim 1, wherein The copper skeleton includes a hollow cylindrical skeleton body fixed to the inner wall. The copper skeleton is also provided with a winding groove formed by a depression on one side of the skeleton body close to the shell and extending along its circumference; the drive coil is wound in the winding groove.

3. The vibration motor according to claim 2, wherein: The winding groove comprises a first winding groove, a second winding groove and a third winding groove which are sequentially spaced apart along the axial direction thereof; The copper skeleton further includes a first avoidance position connecting the first winding groove and the second winding groove and a second avoidance position connecting the second winding groove and the third winding groove; The driving coil includes a first coil, a second coil and a third coil respectively wound in the first winding groove, the second winding groove and the third winding groove; the connection point between the first coil and the second coil is located in the first avoidance position, and the connection point between the second coil and the third coil is located in the second avoidance position.

4. The vibration motor according to claim 3, wherein The driving coil is wound by a wire from one side of the first winding groove in a clockwise direction along the circumference of the skeleton body in one or three layers, and then wound into the second winding groove through the first avoidance position, and wound one or three layers in a counterclockwise direction along the circumference of the skeleton body, and then wound from the second avoidance position to the third winding groove, and wound four layers in a clockwise direction along the circumference of the skeleton body. After winding four layers in the third winding groove, it passes through the second avoidance to the second winding groove and makes the second winding groove full of four layers in total, and then passes through the first avoidance position to the first winding groove and makes the first winding groove full of four layers in total before the wire is output, thereby completing the winding of the first coil, the second coil and the third coil.

5. The vibration motor according to claim 1, wherein The magnetic steel unit includes a first pole core, a first magnetic steel, a second pole core, a second magnetic steel and a third pole core stacked in sequence on the first pole core; the side of the first pole core away from the first magnetic steel is fixed to one of the mass blocks, and the side of the third pole core away from the second magnetic steel is fixed to the other mass block.

6. The vibration motor according to claim 5, wherein: The first magnetic steel and the second magnetic steel are both magnetized along the first direction and in opposite directions.

7. The vibration motor according to claim 1, wherein The housing comprises a hollow outer shell and a first end cover and a second end cover fixed at opposite ends of the outer shell; the copper skeleton is fixed to the inner wall; The elastic member includes a first elastic member and a second elastic member arranged opposite to each other; the side of the first elastic member close to the first end cover is clamped and fixed between the first end cover and the outer shell, and the side of the first elastic member away from the first end cover is fixed to one of the mass blocks; the side of the second elastic member close to the second end cover is clamped and fixed between the second end cover and the outer shell, and the side of the second elastic member away from the second end cover is fixed to the other mass block.

8. The vibration motor according to claim 2, wherein The vibration motor further includes a conductive member, which is fixed to the copper frame and electrically connected to the driving coil.

9. The vibration motor according to claim 8, wherein The copper skeleton further includes a mounting groove formed by a side of the skeleton body close to the shell being recessed in a direction close to the magnetic steel unit; the mounting groove is spaced apart from the winding groove, and the conductive member is fixed in the mounting groove.

Images