Ultra-thin high-performance vibration motor convenient to assemble

Abstract

This invention relates to the field of micro vibration motor technology and discloses an ultra-thin, high-performance vibration motor that is easy to assemble. It includes a stator assembly and a vibrator assembly suspended thereon. The stator consists of a lower housing, a flexible circuit board, and coils. The vibrator includes a spring, a mass block, magnets, and pole pieces. The spring directly covers the top of the stator and is welded and sealed to the lower housing, reducing the overall thickness by eliminating the need for a separate upper housing. The magnets employ a Hellbeck array structure, which, together with the pole pieces and the iron core positioned at the center of the coil, concentrates the magnetic lines of force, effectively enhancing the electromagnetic force output. The spring and the lower housing have corresponding clearance notches and positioning through holes, which avoid interference with the vibration trajectory and improve assembly and welding accuracy. This invention, through optimized integrated design of the magnetic circuit and structure, solves problems such as insufficient driving force, operating noise, and low assembly yield in ultra-thin spaces, improving the motor's response performance and operational stability.

Description

Technical Field

[0001] This invention relates to the field of micro vibration motor technology, specifically to an ultra-thin, high-performance vibration motor that is easy to assemble. Background Technology

[0002] As consumer electronics products such as smartphones, tablets, and laptops evolve towards ultra-thinness and high integration, the Z-axis space of internal components is extremely compressed, requiring the overall thickness of vibration motors to typically be limited to within 1.6mm. Under such extremely limited space, the structural design of traditional vibration motors faces numerous challenges. Due to insufficient internal clearance, the oscillator assembly is prone to physical collisions with the upper housing or stator during oscillation, and the spring vibrating arm is also prone to contacting the housing wall during deformation, thus causing interference noise. Simultaneously, with the significant reduction in thickness, the volume of the magnets and the winding space of the coils in conventional motors are limited, resulting in weakened effective electromagnetic coupling and a lower electromagnetic force constant, making it difficult to meet the short-vibration response performance requirements of end devices. Furthermore, in terms of assembly processes, existing motors mostly rely on external tooling for positioning, lacking precise self-aligning structures, leading to easy radial displacement or welding deformation of parts. In addition, when the mass block and spring are made of different materials, welding strength is difficult to guarantee, and traditional anti-smashing blocks in miniature cavities not only have complex welding processes but also pose risks of loosening and impact noise, affecting the mass production yield and operational stability of the product. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an ultra-thin, high-performance vibration motor that is easy to assemble. It solves the technical problems of weak driving force due to insufficient electromagnetic coupling, noise caused by interference of component movements, and poor structural reliability due to low assembly precision in ultra-thin vibration motors within extremely limited thickness space.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an ultra-thin high-performance vibration motor that is easy to assemble, comprising a stator assembly and an oscillator assembly suspended above the stator assembly; The stator assembly includes a lower housing, an FPCB flexible printed circuit board attached to the lower housing, and a coil fixed to the FPCB flexible printed circuit board; The oscillator assembly includes a spring, a mass block fixed to the lower surface of the spring, a magnet and a pole piece attached to the mass block; The outer edge of the spring piece is attached to the outer edge of the lower housing and fixedly connected by welding; The spring sheet and the lower housing are respectively provided with a notch area for removing material; Both the surface of the spring sheet and the surface of the lower housing are provided with through holes that correspond to each other. The coil and the magnet are vertically aligned and have a gap in the vertical direction. The magnet is a Heilbeck array magnetic circuit structure formed by splicing together multiple alternately magnetized magnets. The multiple alternately magnetized magnets form a symmetrically distributed magnetic field in the gap.

[0005] Preferably, the notch area includes a first notch formed on the spring and a second notch formed on the lower housing. The spring includes a central fixing area and an edge welding area. A spring vibration arm is connected between the central fixing area and the edge welding area. The first notch is located at the physical position of the spring vibration arm, and the second notch is located on the surface of the lower housing in the area directly below the spring vibration arm.

[0006] Preferably, the spring and the mass block are connected to form an integrated structure, and a vertically upward anti-smashing protrusion is formed on the surface of the mass block at a position directly below the spring vibrating arm, with a gap maintained between the top surface of the anti-smashing protrusion and the bottom surface of the spring vibrating arm.

[0007] Preferably, both the spring and the mass block are made of stainless steel, and a laser weld is formed between the mating surfaces of the spring and the mass block, and a laser weld is formed between the outer edge of the spring and the outer edge of the lower housing.

[0008] Preferably, the magnet is composed of five alternately magnetized magnets horizontally spliced ​​together, and the number of coils is two sets, with the two sets of coils symmetrically arranged on both sides of the magnet.

[0009] Preferably, the magnet is composed of seven alternately magnetized magnets horizontally spliced ​​together, and the number of coils is three sets, which are symmetrically arranged and positioned opposite to the magnet.

[0010] Preferably, a hollow region is provided at the center of the coil, and an iron core is provided in the hollow region. The bottom end of the iron core passes through the FPCB flexible printed circuit board and is welded and fixedly connected to the upper surface of the lower housing.

[0011] Preferably, the spring vibrating arm and the lower housing are provided with an interference-prone area at the corresponding positions, and the first notch and the second notch are formed by removing the material corresponding to the interference-prone area.

[0012] Preferably, the through hole penetrates the solid wall of the spring piece and the solid wall of the lower housing, and the through holes are interconnected in the vertical direction to form a straight cylindrical channel that allows the cylindrical member to pass through.

[0013] Preferably, the spring covers the top space of the stator assembly, and the pole piece is attached to the surface of the magnet on the side away from the mass block.

[0014] This invention provides an ultra-thin, high-performance vibration motor that is easy to assemble. It has the following advantages: 1. This invention eliminates the traditional independent upper housing structure by directly covering the top of the stator assembly with a spring sheet and welding it to the lower housing. This significantly reduces the vertical space occupied by the motor, meeting the design requirements of ultra-thin consumer electronics devices. At the same time, by correspondingly removing material from the areas where the spring sheet and the lower housing are prone to interference, a gap area is formed, providing redundant space for the spring sheet vibration arm to extend downwards. This effectively avoids noise caused by physical collisions between components in the ultra-thin space, ensuring the acoustic quality of the motor operation.

[0015] 2. The magnet of this invention adopts a Heilbeck array magnetic circuit structure composed of multiple magnets spliced ​​together. Combined with an iron core set in the center of the coil and welded to the bottom of the lower shell, and pole pieces attached to the surface of the magnet, it can guide magnetic lines of force and form a symmetrical magnetic field with high magnetic flux density in the air gap region. It effectively reduces leakage magnetic loss and lowers magnetic circuit reluctance, effectively improves the electromagnetic force constant BL value, solves the problem of insufficient electromagnetic coupling caused by the limited thickness of the motor, and enables the motor to have stronger driving force output and faster short-vibration response performance.

[0016] 3. This invention features through holes on the surfaces of the spring and the lower housing, allowing for precise alignment of components by using external tooling cylindrical members passing through these holes. Combined with the use of stainless steel and laser welding technology for the spring and the mass block, this ensures a high-strength metallurgical bond between internal components, preventing welding deformation caused by assembly misalignment. Furthermore, the anti-smashing protrusions formed on the mass block provide rigid limiting protection for the oscillator's movement. In conjunction with the welded and sealed structure, this improves production assembly yield while enhancing the machine's resistance to drop impacts and the stability of its long-term operation. Attached Figure Description

[0017] Figure 1 This is a magnetic circuit structure diagram of an extension of the present invention; Figure 2 This is an exploded view of the overall structure of the linear vibration device, a prior art improvement of the present invention. Figure 3 This is a diagram of the existing improved solution of the present invention, showing the integrated welding structure of the spring and the lower shell; Figure 4 This is a structural diagram of the existing improved solution of the present invention, showing the design of the spring and the through hole in the lower housing. Figure 5 This is a structural diagram of the existing improved solution of the present invention, showing the anti-interference design of the spring clip; Figure 6 This is a structural diagram of the integrated anti-smashing design of the mass block, an existing improved solution of the present invention. Figure 7This is a structural diagram of the existing improved solution of the present invention: an integrated anti-smashing design for spring clips. Figure 8 This is a schematic diagram of the magnetic circuit structure of the existing improved scheme of the present invention; Figure 9 A diagram showing the addition of an iron core structure to the middle of the coil in the second extension of the present invention; Figure 10 This is a structural diagram of the third extension of the present invention, showing the integrated design of the lower shell and the iron core. Figure 11 This is a schematic diagram of the integrated anti-smashing structure of the spring and mass block of the present invention.

[0018] Among them, 2. lower shell; 3. coil; 4. FPCB flexible printed circuit board; 5. magnet; 6. mass block; 7. spring; 8. pole piece; 9. spring vibrating arm; 10. through hole; 11. anti-smashing protrusion; 12. iron core; 13. easily interfered area. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1 -Appendix Figure 3 and attached Figure 7 This invention provides an ultra-thin, high-performance vibration motor that is easy to assemble, including a stator assembly and an oscillator assembly suspended above the stator assembly; The stator assembly includes a lower housing 2, an FPCB flexible printed circuit board 4 attached to the lower housing 2, and a coil 3 fixed to the FPCB flexible printed circuit board 4; The oscillator assembly includes a spring 7, a mass block 6 fixed to the lower surface of the spring 7, a magnet 5 attached to the mass block 6, and a pole piece 8; The outer edge of the spring piece 7 is attached to the outer edge of the lower housing 2 and fixedly connected by welding; The spring 7 and the lower housing 2 are respectively provided with material removal notch areas at their relative positions; Both the surface of the spring clip 7 and the surface of the lower housing 2 are provided with through holes 10 that are corresponding to each other; Coil 3 and magnet 5 are vertically aligned and have a gap in the vertical direction. Magnet 5 is composed of multiple alternating magnets arranged to form a Heilbeck array magnetic circuit structure. The multiple alternating magnets form a symmetrically distributed magnetic field in the gap.

[0021] The stator assembly and the oscillator assembly perform electromagnetic interactive motion to output stable vibration feedback to external devices. The lower housing 2 is used to support internal components and provide bottom structural protection. The FPCB flexible printed circuit board 4 connects to the external power supply to transmit electrical signals, which energizes the coil 3 to generate an alternating electromagnetic field to provide a driving force source. The spring sheet 7 provides elastic restoring force to keep the oscillator assembly suspended to support its horizontal reciprocating motion. It works together with the mass block 6, which increases the overall counterweight to improve the vibration experience, and the pole piece 8, which is used to gather magnetic lines of force and reduce magnetic leakage. In the packaging and assembly of the motor, the spring piece 7 and the lower housing 2 are directly enclosed, eliminating the need for a separate upper housing to reduce the space occupied in the Z direction and reduce the overall thickness. At the same time, the notch area provided by both is used to avoid the movement trajectory during air vibration, avoid contact interference and reduce operating noise. In addition, the through hole 10 opened on the surface allows the tooling positioning post to pass through vertically, avoiding poor welding deformation caused by misalignment during assembly, achieving precise positioning and improving the production welding yield. In the final power output, coil 3, together with magnet 5, electromagnetically couples under alternating current to drive the oscillator assembly to generate smooth reciprocating linear motion, thereby efficiently outputting mechanical vibration energy. Furthermore, the Heilbeck array magnetic circuit structure composed of magnet 5 gathers in the air gap region to form a symmetrical magnetic field with high magnetic flux density, effectively avoiding insufficient electromagnetic coupling caused by the height limitation of the ultra-thin space, and effectively improving the electromagnetic force constant BL value and short-vibration response performance of the motor.

[0022] Please see the appendix Figure 3 and attached Figure 4 The notch area includes a first notch on the spring 7 and a second notch on the lower housing 2. The spring 7 includes a central fixing area and an edge welding area. A spring vibrating arm 9 is connected between the central fixing area and the edge welding area. The first notch is located at the physical position of the spring vibrating arm 9, and the second notch is located on the surface of the lower housing 2 in the area directly below the spring vibrating arm 9.

[0023] By using the first and second notches to create spatial clearance, the potential interference of the ultra-thin motor's internal space in the Z-direction is eliminated. The central fixed area is used to support the oscillator assembly inside the suspension, while the edge welding area is used to seal and fix the oscillator to the lower housing 2, preventing the spring piece 7 from falling off and displacing during long-term high-frequency operation of the motor, thus maintaining the internal cavity's sealing and structural stability. On this basis, the spring piece vibration arm 9 works with the oscillator assembly to perform high-frequency horizontal reciprocating elastic deformation motion, providing continuous elastic support and restoring force for the oscillator's reciprocating vibration. By removing excess material that is prone to interference at corresponding positions and providing redundant space for deformation downwards, the first and second notches further prevent the spring piece vibration arm 9 from colliding with the lower housing 2 and causing noise problems when the ultra-thin motor vibrates in the confined Z-direction space. This reduces mechanical wear between structural components and improves the acoustic quality and long-term operational stability of the vibration motor.

[0024] Please see the appendix Figure 5 Appendix Figure 6 and attached Figure 11 The spring 7 and the mass block 6 are connected to form an integrated structure. A vertically upward anti-smashing protrusion 11 is formed on the surface of the mass block 6 at the position directly below the spring vibrating arm 9. A gap is maintained between the top surface of the anti-smashing protrusion 11 and the bottom surface of the spring vibrating arm 9.

[0025] The integrated structure formed by the spring plate 7 and the mass block 6 enhances the overall rigidity of the oscillator assembly, preventing the traditional separate anti-slamming blocks from loosening or falling off during severe vibrations. This reduces assembly steps and solves the welding difficulties caused by limited internal space in ultra-thin motors. Specifically, the spring plate 7 and the mass block 6 have built-in limiting structures. In terms of spatial layout, the vertical distance between the mass block 6 and the external limiting structure (such as the housing edge) is defined as the first gap (1.0 mm), while the gap between the top surface of the anti-slamming protrusion 11 and the bottom surface of the spring plate vibrating arm 9 is defined as the second gap (1.2 mm). Because the first gap is shorter than the second gap, when the motor is subjected to reliability testing or external drop impact, the mass block 6 will preferentially collide at the first gap to achieve rigid physical limiting, preventing the anti-slamming protrusion 11 from colliding with the spring plate vibrating arm 9 at the second gap. This effectively avoids irreversible plastic deformation and interference noise caused by the violent impact of the mass block 6 on the spring vibrating arm 9. The integrated anti-smashing design eliminates the need for additional anti-collision parts, simplifying the manufacturing process and improving the motor's drop resistance. Furthermore, the anti-smashing protrusion 11 works in conjunction with the spring vibrating arm 9 to perform non-contact relative suspension motion under normal operating conditions. This allows the structure to provide safety protection against impacts while maintaining non-interference and friction during daily high-frequency reciprocating vibrations, thus ensuring the stability of the motor's vibration frequency.

[0026] Please see the appendix Figure 2 Both the spring 7 and the mass block 6 are made of stainless steel. There is a laser weld between the mating surfaces of the spring 7 and the mass block 6. There is also a laser weld between the outer edge of the spring 7 and the outer edge of the lower shell 2.

[0027] The use of stainless steel in both the spring 7 and the mass block 6 provides excellent mechanical strength and fatigue resistance, and meets the process requirements for laser welding fusion of similar metal materials to ensure welding strength. Based on this material foundation, the laser weld between the spring 7 and the mass block 6 achieves a high-strength metallurgical bond between the two. According to experimental data comparison, when the traditional mass block is made of tungsten-nickel-iron alloy and the spring is made of stainless steel, the average pull-out force of the dissimilar material welding is only about 5.5 kgf to 6.0 kgf. However, after the present invention uses stainless steel for both the spring 7 and the mass block 6, the pull-out force of the same material laser welding is effectively increased to 10.4 kgf to 11.0 kgf, and the welding strength reaches 200% to 220% of that of traditional dissimilar material (tungsten-nickel-iron alloy + stainless steel) welding. This significant increase in strength avoids the connection failure, cracking, or detachment that can occur with traditional adhesive bonding or weak welding of dissimilar materials under long-term high-frequency vibration and alternating high and low temperatures. This reduces the risk of oscillator component failure and improves the reliability and service life of the internal components of the motor. Furthermore, the laser weld at the outer edge tightly seals and fixes the spring 7 to the lower housing 2, preventing external dust, moisture, and other impurities from entering the motor and adsorbing onto the magnetic circuit or causing the coil 3 to short-circuit. This reduces the motor's poor vibration stop caused by foreign object intrusion and jamming, achieving a high standard of sealing protection and a robust external structure for the entire motor.

[0028] Please see the appendix Figure 7 The magnet 5 is composed of five alternately magnetized magnets arranged horizontally and spliced ​​together. There are two sets of coils 3, which are symmetrically arranged on both sides of the magnet 5.

[0029] The magnet 5, composed of five alternately magnetized magnets arranged horizontally, is used to concentrate magnetic lines of force within a limited space and enhance the magnetic flux density in the air gap region. This avoids the magnetic field divergence and weak magnetic force caused by traditional single-stage magnet arrays. While reducing internal magnetic energy loss, it also improves the output electromagnetic force constant and short-vibration response speed of the motor. Based on this high-strength magnetic circuit structure, two sets of coils 3 symmetrically arranged on both sides work with the magnet 5 to perform uniform and symmetrical electromagnetic coupling motion. This avoids the phenomenon of uneven force on one side causing deflection or jamming of the internal oscillator assembly, effectively reducing mechanical friction loss during operation. Ultimately, this ensures that the motor can perform smooth linear reciprocating vibration and significantly improves the overall output vibration quality.

[0030] Please see the appendix Figure 8 The magnet 5 is composed of seven alternately magnetized magnets arranged horizontally and spliced ​​together. There are three sets of coils 3, which are symmetrically arranged and set opposite to the magnet 5.

[0031] The magnet 5, composed of seven alternately magnetized magnets arranged horizontally, is used to further expand the coverage of the air gap magnetic field and increase the peak magnetic flux. This avoids insufficient driving force caused by the weakening of the edge magnetic field in large-size motors. While reducing end leakage magnetic loss, it achieves the effect of adapting to larger driving requirements and providing stronger vibration. Based on this extended high-strength magnetic circuit structure, three sets of coils 3 work with the magnet 5 to perform multi-point distributed alternating electromagnetic coupling motion. This avoids the phenomenon of warping and swaying of the long strip oscillator due to uneven force under high-speed long-stroke vibration, effectively reducing energy loss in non-linear motion directions. Ultimately, this achieves the effect of providing greater thrust and ensuring the stability of high-frequency motor operation.

[0032] Please see the appendix Figure 9 and attached Figure 10 A hollow area is provided at the center of the coil 3, and an iron core 12 is provided in the hollow area. The bottom end of the iron core 12 passes through the FPCB flexible printed circuit board 4 and is welded and fixedly connected to the upper surface of the lower housing 2.

[0033] The iron core 12, located within the hollow region, guides and concentrates the magnetic lines of force generated by the energized coil 3, preventing the dispersion of magnetic lines of force and the resulting low electromagnetic conversion efficiency when the iron core 12 is absent. This reduces energy and leakage flux losses while enhancing the magnetic field strength of the stator assembly and improving the overall driving force of the motor. Furthermore, the iron core 12 passes through the FPCB flexible printed circuit board 4 and is welded and fixed to the lower housing 2 to provide high-strength structural support, preventing the iron core 12 from loosening or tilting under long-term alternating electromagnetic forces. This effectively reduces the potential risks of changes in the internal magnetic circuit air gap or structural interference, ultimately ensuring the long-term stable output and reliable operation of the motor's electromagnetic performance.

[0034] Please see the appendix Figure 3 and attached Figure 4 The spring vibrating arm 9 and the lower housing 2 are provided with an interference-prone area 13 at the corresponding positions. The first notch and the second notch are formed by material that is used to remove the interference-prone area 13.

[0035] The first and second notches provide physical redundancy space for the downward deformation of the spring, thus avoiding interference noise caused by the collision between the spring vibrating arm 9 and the lower housing 2 when the internal space of the ultra-thin motor is limited in the Z direction. This reduces mechanical wear between structural components and improves the acoustic quality and long-term operational stability of the vibration motor. Within this clearance space, the spring vibrating arm 9, in conjunction with the oscillator assembly, performs high-frequency horizontal reciprocating elastic deformation motion, providing continuous elastic support and restoring force for the oscillator's reciprocating vibration. At the same time, the lower housing 2 serves to support the internal components of the motor and provides structural enclosure protection at the bottom, thereby preventing external dust or impurities from entering the motor and causing magnetic circuit adsorption or coil short circuits. This reduces poor vibration stoppage caused by foreign objects jamming the motor and lowers the failure rate. The spring, including the spring vibrating arm 9, is made of stainless steel, which provides excellent mechanical strength and fatigue resistance during long-term high-frequency vibration. This is common knowledge and will not be elaborated further here. Finally, the lower housing 2, composed of the base plate and the outer perimeter, achieves the effect of accommodating the internal components and enclosing the spring. This will not be elaborated further here.

[0036] Please see the appendix Figure 3 The through hole 10 penetrates the solid wall of the spring piece 7 and the solid wall of the lower shell 2. The through holes 10 are interconnected in the vertical direction and form a straight cylindrical channel that allows the columnar component to pass through.

[0037] The through-hole 10, which penetrates the wall of the spring piece 7 and the lower housing 2, provides a reference alignment aid during the assembly process, preventing radial displacement deviation between the spring piece 7 and the lower housing 2 during welding and fixing. This reduces assembly defects caused by accumulated tolerances and improves the installation accuracy and structural consistency of the internal components of the motor. Based on this through-hole structure, the straight cylindrical channel formed by the through-hole 10, together with the external positioning column component, provides insertion and limiting, effectively preventing loosening or orientation deviation of parts during the automated assembly process. This reduces the risk of positioning failure during the manufacturing process, ultimately ensuring the overall stability of the motor structure and improving production efficiency.

[0038] Please see the appendix Figure 1 and attached Figure 2 The spring 7 covers the top space of the stator assembly, and the pole piece 8 is attached to the surface of the magnet 5 away from the mass block 6.

[0039] The spring plate 7 covering the top of the stator assembly is used to close and limit the internal magnetic circuit space of the motor, avoiding axial collision or interference between the stator assembly and the mover assembly during oscillation. This reduces mechanical impact loss and protects the integrity of the stator structure while maintaining the stability of the vibration space. At the same time, the pole piece 8 attached to the surface of the magnet 5 is used to concentrate the magnetic lines of force and optimize the direction of the magnetic circuit loop. This avoids the weakening of electromagnetic force caused by the diffusion of magnetic flux to non-working areas, effectively reducing magnetic energy loss. Ultimately, this improves the utilization rate of the magnet 5 and enhances the output driving force of the motor.

[0040] Working principle: The electrical signal is transmitted to the coil 3 through the FPCB flexible printed circuit board 4 to generate an alternating electromagnetic field. This magnetic field is electromagnetically coupled with the Helbeck array magnetic circuit structure formed by the magnets 5 in the vertical space, generating a driving force to drive the oscillator assembly composed of spring 7, mass block 6 and pole piece 8 to overcome the elastic restoring force of the spring 7 and make horizontal reciprocating linear motion, realizing the conversion of electrical energy into mechanical vibration energy. In order to meet the ultra-thin requirements of electronic devices, the spring 7 directly covers the top of the stator assembly and is welded and sealed with the lower housing 2 to compress the Z-direction space. At the same time, the pole piece 8 attached to the surface of the magnets 5 and the iron core 12, which is centered on the coil 3 and whose bottom end passes through the FPCB flexible printed circuit board 4 and is welded and fixed to the lower housing 2, guide and converge the magnetic lines of force, effectively avoiding magnetic field divergence and improving electromagnetic conversion efficiency.

[0041] In terms of motion reliability, the spring 7 and the lower housing 2 form a first notch and a second notch by correspondingly removing material from the easily interfered area 13, providing redundant space for the downward deformation of the spring vibrating arm 9, avoiding noise caused by physical interference. Combined with the anti-smashing protrusion 11 formed on the surface of the mass block 6, it maintains non-contact levitation motion with the spring vibrating arm 9 under normal operating conditions, and provides rigid limiting protection when subjected to drop impacts. In the assembly stage, the through-hole 10 penetrating the walls of the spring 7 and the lower housing 2, along with the cylindrical component of the external tooling, achieves reference alignment. Laser welding of stainless steel ensures a high-strength metallurgical bond between the components, enhancing the overall sealing and protection performance of the machine, and ultimately guaranteeing the electromagnetic performance stability and structural fatigue resistance of the motor during long-term operation in a confined space.

Claims

1. A super-thin high-performance vibration motor convenient to assemble, characterized in that, Includes a stator assembly and an oscillator assembly suspended above the stator assembly; The stator assembly includes a lower housing (2), an FPCB flexible printed circuit board (4) attached to the lower housing (2), and a coil (3) fixed to the FPCB flexible printed circuit board (4). The oscillator assembly includes a spring (7), a mass block (6) fixed on the lower surface of the spring (7), a magnet (5) and a pole piece (8) attached to the mass block (6); The outer edge of the spring piece (7) is attached to the outer edge of the lower housing (2) and fixedly connected by welding; The spring piece (7) and the lower shell (2) are respectively provided with a notch area for removing material; Both the surface of the spring sheet (7) and the surface of the lower housing (2) are provided with through holes (10) that correspond to each other. The coil (3) and the magnet (5) are vertically aligned and have a gap in the vertical direction. The magnet (5) is composed of multiple alternating magnets arranged to form a Heilbeck array magnetic circuit structure. The multiple alternating magnets form a symmetrically distributed magnetic field in the gap.

2. The ultra-thin high-performance vibration motor convenient to assemble according to claim 1, characterized in that, The notch area includes a first notch on the spring (7) and a second notch on the lower housing (2). The spring (7) includes a central fixing area and an edge welding area. A spring vibrating arm (9) is connected between the central fixing area and the edge welding area. The first notch is located at the physical position of the spring vibrating arm (9), and the second notch is located on the surface of the lower housing (2) in the area directly below the spring vibrating arm (9).

3. The ultra-thin high-performance vibration motor convenient to assemble according to claim 2, characterized in that, The spring (7) and the mass block (6) are connected to form an integrated structure. The surface of the mass block (6) is formed with a vertically upward anti-smashing protrusion (11) at the position directly below the spring vibrating arm (9). A gap is maintained between the top surface of the anti-smashing protrusion (11) and the bottom surface of the spring vibrating arm (9).

4. The ultra-thin high-performance vibration motor convenient to assemble according to claim 1, characterized in that, Both the spring (7) and the mass block (6) are made of stainless steel. There is a laser weld between the contact surfaces of the spring (7) and the mass block (6). There is also a laser weld between the outer edge of the spring (7) and the outer edge of the lower shell (2).

5. The ultra-thin high-performance vibration motor convenient to assemble according to claim 1, characterized in that, The magnet (5) is composed of five magnets arranged alternately and horizontally spliced ​​together. The number of coils (3) is two sets, and the two sets of coils (3) are symmetrically arranged on both sides of the magnet (5).

6. The ultra-thin high-performance vibration motor convenient to assemble according to claim 1, characterized in that, The magnet (5) is composed of seven alternately magnetized magnets arranged horizontally. The number of coils (3) is three sets, and the three sets of coils (3) are arranged symmetrically to each other and opposite to the magnet (5).

7. The ultra-thin high-performance vibration motor convenient to assemble according to claim 1, characterized in that, A hollow area is provided at the center of the coil (3), and an iron core (12) is provided in the hollow area. The bottom end of the iron core (12) passes through the FPCB flexible printed circuit board (4) and is welded and fixedly connected to the upper surface of the lower housing (2).

8. The ultra-thin high-performance vibration motor convenient to assemble according to claim 2, characterized in that, The elastic sheet vibration arm (9) is provided with an interference area (13) at the corresponding position of the lower shell (2), and the first notch and the second notch are formed by removing the material at the interference area (13).

9. The ultra-thin high-performance vibration motor convenient to assemble according to claim 1, characterized in that, The through hole (10) penetrates the solid wall surface of the elastic sheet (7) and the solid wall surface of the lower shell (2), and the through holes (10) are mutually penetrated in the vertical direction and form a straight cylinder passage allowing the cylindrical member to penetrate.

10. The ultra-thin high-performance vibration motor convenient to assemble according to claim 1, characterized in that, The elastic sheet (7) covers the top space of the stator assembly, and the pole sheet (8) is attached to the surface of the magnetic steel (5) away from the mass block (6).

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