Non-magnetic steel vibration motor

Abstract

The application provides a non-magnetic steel vibration motor, which comprises a stator shell, an outer shell, a coil and a vibrator assembly; the stator shell is integrally formed with a winding part; the outer shell is fixed on the stator shell by buckling and forms a motor cavity together with the stator shell; the coil is sleeved on the periphery of the winding part and located in the motor cavity, the top end of the coil is flush with or lower than the top surface of the winding part; the vibrator assembly is arranged in the motor cavity and fixedly connected with the outer shell, the output end of the vibrator assembly has the freedom of axial vibration along the outer shell; the vibrator assembly has a magnetic conduction area corresponding to the position of the coil, which is used for generating a force magnetic coupling effect with the coil through which a unidirectional square wave driving voltage is passed. The non-magnetic steel vibration motor provided by the application realizes vibration output by setting the magnetic conduction area on the vibrator assembly to generate a force magnetic coupling effect with the coil, does not need to rely on permanent magnetic materials, can reduce the cost, and improves the motor vibration performance and working reliability.

Description

Technical Field

[0001] This invention belongs to the field of vibration motor technology, specifically relating to a non-magnetic steel vibration motor. Background Technology

[0002] Linear vibration motors are commonly used in various electronic products, such as vibration feedback for game controllers, vibration of mobile phones, and massagers. Their main working principle is to use the force-magnetic coupling between an energized coil and a permanent magnet fixed on an elastic element to achieve vibration.

[0003] In recent years, the price of rare earth permanent magnet materials has continued to rise, putting significant cost pressure on traditional linear vibration motors. Meanwhile, the bonding and fixing of permanent magnet materials is a challenging aspect of motor manufacturing, often resulting in improper bonding that causes magnets to detach, affecting product reliability. Furthermore, because permanent magnets occupy a large amount of space inside the motor, this not only compresses the motor's amplitude space and restricts its vibration performance, but also the inherent property of permanent magnets to attract iron-containing foreign objects can easily lead to problems such as foreign object jamming or coil short circuits, thus increasing the reliability risks of the motor. Summary of the Invention

[0004] This invention provides a non-magnetic vibratory motor, which aims to reduce the cost of vibratory motors and improve their performance and reliability.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a non-magnetic vibratory motor, comprising:

[0006] Stator housing, with an integrally formed winding section on the stator housing;

[0007] The outer casing is fastened and fixed to the stator housing, forming the machine cavity together with the stator housing;

[0008] The coil is looped around the outer periphery of the winding part and located inside the machine cavity. The top of the coil is flush with or lower than the top surface of the winding part.

[0009] The oscillator assembly is located inside the machine cavity and is fixedly connected to the outer shell. The output end of the oscillator assembly has the degree of freedom to vibrate along the axial direction of the outer shell.

[0010] The oscillator assembly has a magnetically conductive area, which corresponds to the position of the coil and is used to generate a force-magnetic coupling effect with the coil through which a unidirectional square wave driving voltage is applied.

[0011] In one possible implementation, the oscillator assembly includes:

[0012] The spring is located directly above the coil, with one end fixedly connected to the top wall of the outer shell and the other end suspended, and the suspended end has the freedom to vibrate along the axial direction of the outer shell.

[0013] The gravity block is fixedly connected to the suspension end of the spring and is located to the side of the coil;

[0014] The spring sheet has a magnetically conductive area.

[0015] In some embodiments, the outer shell is made of an elastic magnetic material, and a spring sheet is stamped on the top wall of the outer shell.

[0016] For example, the stator housing is a rectangular plate, and the winding part is a rectangular platform integrally stamped onto the rectangular plate.

[0017] In one possible implementation, the oscillator assembly includes:

[0018] An irregularly shaped spring sheet is located directly above the coil, with its edge fixedly connected to the peripheral or top wall of the outer casing, and its central region having the freedom to vibrate along the axial direction of the outer casing.

[0019] The gravity disk is fixedly connected to the central area of ​​the irregularly shaped spring plate, and a magnetic conductive area is provided on the gravity disk.

[0020] In some embodiments, a clearance hole is provided on the top wall of the housing, the edge of the irregularly shaped spring sheet is fitted and fixed to the inner top wall of the housing, and the gravity disk is located between the irregularly shaped spring sheet and the coil.

[0021] For example, the outer casing has multiple slots spaced apart along its circumference, the stator casing has multiple insert plates spaced apart along its circumference, each insert plate is inserted into each slot along the axial direction of the outer casing, the irregular spring sheet has multiple protrusions spaced apart along its circumference, each protrusion is inserted into the slot bottom of each slot and the end wall of the corresponding insert plate, and the gravity plate is located between the irregular spring sheet and the top wall of the outer casing.

[0022] For example, the irregularly shaped spring sheet has a through hole at its center, and the gravity disk has a fixed shaft at its center, which is inserted and fixed to the through hole.

[0023] For example, the irregularly shaped spring sheet has a planar disc structure, the gravity disk has a frustum structure, and the conical end of the gravity disk faces the irregularly shaped spring sheet.

[0024] In some embodiments, the gravity disk is made of magnetic material, and the winding part is a truncated cone integrally stamped on the bottom wall of the stator housing.

[0025] The beneficial effects of the non-magnetic vibratory motor provided by this invention are as follows: Compared with the prior art, the non-magnetic vibratory motor of this invention achieves force-magnetic coupling between a magnetically conductive area on the vibrator assembly and a coil subjected to a unidirectional square wave drive voltage, thereby causing the vibrator assembly to output vibration along the axial direction of the outer shell. This eliminates the need for magnets, thus avoiding reliance on permanent magnet materials and significantly reducing costs. Furthermore, compared to traditional vibratory motors, it saves the internal space occupied by magnets, thereby increasing the motor's energy density and vibration amplitude. It also avoids the difficulties of bonding and fixing permanent magnet materials, thus reducing product reliability risks. In addition, since the magnetically conductive area itself is not magnetic, it avoids problems such as motor jamming or coil short circuits caused by the adsorption of iron-containing foreign objects, further improving operational reliability. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of a non-magnetic vibratory motor according to the first embodiment of the present invention.

[0027] Figure 2 This is an exploded structural diagram of a non-magnetic vibratory motor provided in the first embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of a non-magnetic vibratory motor according to a second embodiment of the present invention.

[0029] Figure 4 This is an exploded structural diagram of a non-magnetic steel vibration motor provided in the second embodiment of the present invention;

[0030] Figure 5 This is a cross-sectional structural schematic diagram of a non-magnetic steel vibration motor provided in the third embodiment of the present invention;

[0031] Figure 6 This is an exploded structural diagram of a non-magnetic steel vibration motor provided in the third embodiment of the present invention;

[0032] Figure 7 The waveform diagram of the unidirectional square wave drive voltage applied to the coil in a non-magnetic vibratory motor provided in an embodiment of the present invention.

[0033] In the diagram: 10, stator housing; 11, winding section; 12, insert plate; 20, outer casing; 201, machine cavity; 21, clearance hole; 22, slot; 30, coil; 40, oscillator assembly; 41, spring; 42, gravity block; 43, irregularly shaped spring sheet; 431, raised edge; 432, through hole; 44, gravity disk; 441, fixed shaft. Detailed Implementation

[0034] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0035] Please refer to the following: Figures 1 to 7 The present invention provides a non-magnetic steel vibratory motor. The non-magnetic steel vibratory motor includes a stator housing 10, an outer shell 20, a coil 30, and a vibrator assembly 40. The stator housing 10 has an integrally formed winding portion 11. The outer shell 20 is fastened and fixed to the stator housing 10, forming a cavity 201 together with the stator housing 10. The coil 30 is encircled by the winding portion 11 and located within the cavity 201, with the top end of the coil 30 flush with or lower than the top surface of the winding portion 11. The vibrator assembly 40 is disposed within the cavity 201 and fixedly connected to the outer shell 20. The output end of the vibrator assembly 40 has a degree of freedom to vibrate along the axial direction of the outer shell 20. The vibrator assembly 40 has a magnetically conductive region corresponding to the position of the coil 30, used to generate a force-magnetic coupling effect with the coil 30 to which a unidirectional square wave driving voltage is applied.

[0036] It should be noted that the force-magnetic coupling effect refers to the deformation of a magnetostrictive material (i.e., a magnetically conductive material) due to the mechanical force generated by a magnetic field. Specifically, in this embodiment of the invention, a magnetic field is introduced into the coil 30... Figure 7 When the unidirectional square wave driving voltage is applied, a periodic magnetic field is generated. When the magnetic field force acts on the magnetically conductive region, it causes the oscillator assembly 40 to deform in one direction. When the magnetic field force disappears, the oscillator assembly 40 deforms in the opposite direction due to its own rebound force. Thus, under the action of the periodic magnetic field force, the oscillator assembly 40 achieves linear reciprocating vibration. By setting the positions of the magnetically conductive region and the coil 30 accordingly, the magnetic field lines generated by the coil 30 pass perpendicularly through the magnetically conductive region, thereby enabling the oscillator assembly 40 to vibrate along the direction of the magnetic wire. Specifically, in this embodiment, the coil 30 is a horizontally wound coil 30 (see [reference]). Figure 1 , Figure 3 , Figure 5 (and aligned with the axial direction of the outer shell 20), so the oscillator assembly 40 vibrates along the axial direction of the outer shell 20 under the force-magnetic coupling between the magnetic field region and the coil 30.

[0037] It should be understood that the purpose of applying a unidirectional square wave driving voltage to the coil 30 in this embodiment is to generate a periodically occurring magnetic field. Since the magnetically conductive region itself does not have magnetic polarity, the change in the direction of the magnetic field has no effect on the magnetic force acting on the magnetically conductive region. If a bidirectional square wave driving voltage (i.e., alternating positive and negative voltage) is used, vibration cannot be generated. Therefore, only a unidirectional square wave driving voltage can be used. At the voltage peak, the coil 30 generates a magnetic field that causes the oscillator assembly 40 to deform. At the voltage trough, the magnetic field disappears or weakens, and the oscillator assembly 40 rebounds. Of course, in order to improve the vibration intensity and motor performance, the applied unidirectional square wave driving voltage should match the natural frequency of the oscillator assembly 40. Specifically, the natural frequency of the oscillator assembly 40 can be confirmed by frequency sweeping, and then a unidirectional square wave driving voltage of the corresponding frequency is applied.

[0038] In addition, it should be understood that the magnetic conductive area set on the oscillator assembly 40 can be a magnetic sheet attached directly above the coil 30, or the part of the oscillator assembly 40 that serves as the magnetic conductive area can be made of magnetic material, or the entire oscillator assembly 40 can be made of magnetic material. Specifically, the magnetic material only needs to be an iron-containing material. Of course, in order to meet the elasticity requirements and vibration fatigue strength requirements of the oscillator assembly 40, silicon steel can be preferred here.

[0039] This embodiment provides a non-magnetic vibratory motor. Compared with the prior art, by setting a magnetically conductive area on the vibrator assembly 40 and having a force-magnetic coupling effect with the coil 30 through which a unidirectional square wave driving voltage is applied, the vibrator assembly 40 outputs vibration along the axial direction of the outer shell 20. This eliminates the need for magnets, thus avoiding dependence on permanent magnet materials and greatly reducing costs. At the same time, compared with traditional vibratory motors, it also saves the internal space occupied by magnets, thereby increasing the energy density of the motor and increasing the vibration. It also avoids the difficulties of gluing and fixing permanent magnet materials, thereby reducing the reliability risk of the product. In addition, since the magnetically conductive area itself is not magnetic, it can avoid the problem of motor jamming or coil 30 short circuit due to the adsorption of iron-containing foreign objects, thereby further improving the reliability of operation.

[0040] As one specific embodiment of the above-described oscillator assembly 40, please refer to Figure 1 and Figure 2 The oscillator assembly 40 includes a spring plate 41 and a gravity block 42; wherein, the spring plate 41 is located directly above the coil 30, one end is fixedly connected to the top wall of the outer shell 20, and the other end is suspended, and the suspended end has the degree of freedom to vibrate along the axial direction of the outer shell 20, and the spring plate 41 has a magnetic conductive area; the gravity block 42 is fixedly connected to the suspended end of the spring plate 41 and is located on the side of the coil 30.

[0041] The combination structure of spring piece 41 and gravity block 42 is adopted. The function of spring piece 41 is to achieve force-magnetic coupling with coil 30 through its own elasticity and magnetic field area, so that spring piece 41 vibrates when a unidirectional square wave driving voltage is applied to coil 30. The function of gravity block 42 is to increase the tension of spring piece 41, enhance vibration energy, and improve the vibration performance of motor.

[0042] Specifically, in this embodiment, see Figure 2 The outer shell 20 is made of an elastic magnetic material, and a spring piece 41 is stamped on the top wall of the outer shell 20. The outer shell 20 is made entirely of an elastic magnetic material such as silicon steel, and a U-shaped groove is punched out on the top wall of the outer shell 20 using a stamping process. The part left inside the U-shaped groove can form the spring piece 41, which can greatly reduce the processing difficulty and cost. Moreover, since the spring piece 41 and the outer shell 20 are an integral structure, the problem of the spring piece 41 falling off can be avoided, resulting in high reliability.

[0043] It should be noted that, in this embodiment, see Figure 1 and Figure 2 The stator housing 10 is a rectangular plate, and the winding section 11 is a rectangular platform integrally stamped onto the rectangular plate. The rectangular structure not only maximizes space utilization but also allows the coil 30 to provide sufficient magnetic induction intensity to the magnetically conductive area directly above it, thereby improving vibration performance.

[0044] As another specific embodiment of the above-described oscillator assembly 40, please refer to... Figures 3 to 6 The oscillator assembly 40 includes a shaped spring plate 43 and a gravity disk 44. The shaped spring plate 43 is located directly above the coil 30 and its edge is fixedly connected to the peripheral wall or top wall of the outer shell 20. The central region has the freedom to vibrate along the axial direction of the outer shell 20. The center of the gravity disk 44 is fixedly connected to the central region of the shaped spring plate 43, and the gravity disk 44 is provided with a magnetic conductive region.

[0045] The oscillator assembly 40 is formed by connecting the irregularly shaped spring sheet 43 and the gravity disk 44 at the center. The force on the irregularly shaped spring sheet 43 is more balanced, which can improve the vibration stability of the oscillator assembly 40. At the same time, the periphery of the irregularly shaped spring sheet 43 is fixedly connected to the inner wall of the outer shell 20. Specifically, it can be fixed by gluing or welding. The connection contact area between the two is large, which can ensure the connection reliability of the irregularly shaped spring sheet 43.

[0046] Specifically, see Figure 3 and Figure 4 In this embodiment, an avoidance hole 21 is provided on the top wall of the outer shell 20, the edge of the irregular spring sheet 43 is attached and fixed to the inner top wall of the outer shell 20, and the gravity disk 44 is located between the irregular spring sheet 43 and the coil 30.

[0047] By opening a clearance hole 21 on the top wall of the outer casing 20, the central area of ​​the irregular spring plate 43 can have sufficient vibration space, so that the gravity plate 44 can be placed above the irregular spring plate 43 for fixation. Compared with the connection method of suspending the gravity plate 44, the risk of the gravity plate 44 falling off can be avoided, and the reliability can be improved. At the same time, the area of ​​the outer casing 20 located outside the clearance hole 21 can be used to achieve close fixation (gluing or welding) with the irregular spring plate 43, thereby increasing the contact area between the two and thus improving the connection reliability of the irregular spring plate 43.

[0048] For example, see Figure 5 and Figure 6 In this embodiment, the outer casing 20 has a plurality of slots 22 spaced apart along its circumferential direction on its peripheral wall, and the stator casing 10 has a plurality of insert plates 12 spaced apart along its circumferential direction on its edge. Each insert plate 12 is inserted into each slot 22 in a corresponding manner along the axial direction of the outer casing 20. The irregular spring sheet 43 has a plurality of protrusions 431 spaced apart along its circumferential direction on its edge. Each protrusion 431 is inserted into the bottom of the slot 22 and the end wall of the corresponding insert plate 12. The gravity disk 44 is located between the irregular spring sheet 43 and the top wall of the outer casing 20.

[0049] By inserting the protruding edges 431 of the irregular spring sheet 43 into the corresponding slots 22, the circumferential rotational freedom of the irregular spring sheet 43 can be restricted. At the same time, the pressing action of the end wall of the insert plate 12 in the slot 22 against the protruding edges 431 can restrict the axial movement freedom of the irregular spring sheet 43 along the outer shell 20. Compared with the method of connection and fixation by gluing or welding, the method of fixing by inserting the protruding edges 431 is more reliable and can avoid the problem of falling off caused by gluing failure or weld cracking.

[0050] Optionally, in this embodiment, see Figures 3 to 6 The irregularly shaped spring plate 43 has a through hole 432 at its center, and the gravity disk 44 has a fixed shaft 441 at its center. The fixed shaft 441 is inserted and fixed into the through hole 432. By setting the through hole 432 and the fixed shaft 441 for insertion and engagement, the coaxiality of the connection between the irregularly shaped spring plate 43 and the gravity disk 44 can be improved, thereby ensuring the force balance of the irregularly shaped spring plate 43 and improving vibration stability. Of course, after the two are inserted, their connection position can be reinforced by welding or bonding to avoid the risk of the gravity disk 44 and the irregularly shaped spring plate 43 detaching, further improving reliability.

[0051] It should be noted that, see Figures 3 to 6In this embodiment, the irregularly shaped spring plate 43 is a planar disk structure, and the gravity disk 44 is a frustum-shaped cone structure, with the conical end of the gravity disk 44 facing the irregularly shaped spring plate 43. The planar disk structure of the irregularly shaped spring plate 43 ensures that the driving force required for elastic deformation in its central region is consistent on both sides, thereby improving vibration stability. Simultaneously, because a gap can be formed between the conical end of the gravity disk 44 and the irregularly shaped spring plate 43, the irregularly shaped spring plate 43 can vibrate freely in the direction of the gravity disk 44, avoiding interference between the deformation positions of the gravity disk 44 and the irregularly shaped spring plate 43 that would affect the vibration output, thus improving vibration stability.

[0052] Specifically, in this embodiment, the irregular spring sheet 43 has multiple spiral hollow grooves evenly distributed along its circumference. By setting the spiral hollow grooves, the length of the deformed part of the irregular spring sheet 43 can be increased, thereby increasing the central vibration amplitude of the irregular spring sheet 43. At the same time, it can also reduce the probability of the irregular spring sheet 43 breaking and increase its service life.

[0053] In some embodiments, see Figures 3 to 6 The gravity disk 44 is made of magnetically conductive material, and the winding part 11 is a truncated cone integrally stamped on the bottom wall of the stator shell 10. The gravity disk 44 can not only enhance the vibration energy, but also act as a magnetically conductive area to perform force-magnetic coupling with the magnetic field. Compared with conventional vibration motors, it can save space for permanent magnets, thereby increasing the energy density of the motor and reducing costs. The truncated cone-shaped winding part 11 stamped on the stator shell 10 not only has low processing costs and a stable and reliable structure, but also allows the coil 30 to be wound into a cylindrical shape that matches the irregular spring sheet 43 and the gravity disk 44, thereby ensuring that the driving force on the irregular spring sheet 43 is balanced at all circumferential angles, thus improving vibration stability.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-magnetic steel vibration motor, characterized in that, include: Stator housing, wherein a winding portion is integrally formed on the stator housing; The outer casing is fastened and fixed to the stator housing, and together with the stator housing, they form the machine cavity; A coil is looped around the periphery of the winding portion and located inside the machine cavity. The top end of the coil is flush with or lower than the top surface of the winding portion. An oscillator assembly is disposed within the machine cavity and fixedly connected to the outer shell. The output end of the oscillator assembly has a degree of freedom to vibrate along the axial direction of the outer shell. The oscillator assembly has a magnetically conductive region, which corresponds to the position of the coil. The magnetic field lines generated by the coil pass perpendicularly through the magnetically conductive region. The magnetically conductive region is used to generate a force-magnetic coupling effect with the coil through which a unidirectional square wave driving voltage is applied, and the unidirectional square wave driving voltage applied to the coil is matched with the natural frequency of the oscillator assembly.

2. The non-magnetic vibratory motor as described in claim 1, characterized in that, The oscillator assembly includes: A spring is located directly above the coil, with one end fixedly connected to the top wall of the outer casing and the other end suspended, and the suspended end has the freedom to vibrate along the axial direction of the outer casing. A gravity block is fixedly connected to the suspension end of the spring sheet and located to the side of the coil; The spring sheet has the magnetically conductive region.

3. The non-magnetic vibratory motor as described in claim 2, characterized in that, The outer shell is made of an elastic magnetic material, and the spring sheet is stamped on the top wall of the outer shell.

4. A non-magnetic vibratory motor as described in any one of claims 1-3, characterized in that, The stator housing is a rectangular plate, and the winding part is a rectangular platform integrally stamped onto the rectangular plate.

5. A non-magnetic vibratory motor as described in claim 1, characterized in that, The oscillator assembly includes: An irregularly shaped spring sheet is located directly above the coil, and its edge is fixedly connected to the peripheral wall or top wall of the outer casing. The central region has the freedom to vibrate along the axial direction of the outer casing. The gravity disk is fixedly connected to the central region of the irregularly shaped spring sheet, and the gravity disk is provided with the magnetic conductive region.

6. A non-magnetic steel vibration motor as described in claim 5, characterized in that, The top wall of the outer casing has a clearance hole, the edge of the irregularly shaped spring sheet is fixed to the inner top wall of the outer casing, and the gravity plate is located between the irregularly shaped spring sheet and the coil.

7. A non-magnetic steel vibration motor as described in claim 5, characterized in that, The outer casing has multiple slots spaced apart circumferentially on its peripheral wall, and the stator shell has multiple insert plates spaced apart circumferentially on its edge. Each insert plate is inserted into a slot along the axial direction of the outer casing. The irregularly shaped spring sheet has multiple protrusions spaced apart circumferentially on its edge. Each protrusion is inserted between the bottom of the slot and the end wall of the corresponding insert plate. The gravity plate is located between the irregularly shaped spring sheet and the top wall of the outer casing.

8. A non-magnetic vibratory motor as described in claim 5, characterized in that, The irregularly shaped spring sheet has a through hole at its center, and the gravity disk has a fixed shaft at its center. The fixed shaft is inserted and fixed to the through hole.

9. A non-magnetic steel vibration motor as described in claim 5, characterized in that, The irregularly shaped spring sheet is a planar disc structure, and the gravity disk is a frustum-shaped cone structure, with the conical end of the gravity disk facing the irregularly shaped spring sheet.

10. A non-magnetic steel vibration motor as described in any one of claims 5-9, characterized in that, The gravity disk is made of magnetic material, and the winding part is a truncated cone integrally stamped on the bottom wall of the stator shell.

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