Brushless direct current vibration motor

Abstract

The invention discloses a brushless direct current vibration motor, and relates to the technical field of motor equipment. Comprising a motor body, continuous rotation is converted into instantaneous pulse impact through meshing of an inner ratchet ring, a tooth block and a pawl, high-quality and high-strength click type tactile feedback is generated and far exceeds the rotating vibration texture of a traditional ERM motor, a centrifugal clutch is formed by a first spring and a first telescopic rod, and the motor body is driven by the first telescopic rod to rotate. By means of the structure, strong impact can be generated only at the high rotating speed, decoupling of the vibration strength and the rotating speed is achieved, false triggering impact at the low speed is effectively buffered, the mechanism is protected, and a mechanical buffering layer is built between the movable block and the rotor body through the limiting assembly. The impact force and noise generated when the movable block is thrown out and withdrawn and collides with the body are greatly reduced, the problems of material fatigue and damage caused by inertial collision are effectively solved, the durability of the impact mechanism is remarkably improved, and the service life of the impact mechanism is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of motor equipment technology, specifically to a brushless DC vibration motor. Background Technology

[0002] As a core tactile feedback component in modern consumer electronics, the performance of brushless DC vibration motors directly determines the quality of the user experience. Currently, there are two main technical approaches in this field: one is the traditional motor based on eccentric rotating mass, and the other is the linear motor based on the principle of linear resonant actuator (LRA) or voice coil motor. As consumer electronics demand increasingly refined and diversified tactile feedback, existing brushless DC vibration motors are gradually revealing limitations in both structural design and performance, making it difficult to meet the needs of high-end application scenarios.

[0003] In terms of tactile feedback, traditional eccentric rotor motors generate centrifugal vibration through the rotation of an eccentric block. The vibration mode is continuous rotational vibration, which cannot form a clear, high-intensity "click" pulse feedback. Moreover, the vibration texture is loose and there is a significant difference from the triggering experience of a real physical button. Furthermore, existing brushless vibration motors generally have the problem of a single tactile mode, and most can only provide continuous vibration of a fixed intensity. They cannot switch between different texture feedback modes such as "strong pulse" and "gentle continuous" according to the application scenario, making it difficult to match the diverse interaction needs of smart terminals. Therefore, this invention provides a brushless DC vibration motor. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a brushless DC vibration motor. It solves the problem that traditional eccentric rotor motors generate centrifugal vibration through the rotation of an eccentric block. The vibration mode is continuous rotational vibration, which cannot form a clear, high-intensity "click"-like pulse feedback. Moreover, the vibration texture is loose, and there is a significant difference from the triggering experience of a real physical button. Furthermore, existing brushless vibration motors generally have a single tactile mode, and most can only provide continuous vibration of a fixed intensity. They cannot switch between different texture feedback modes such as "strong pulse" and "gentle continuous" according to the application scenario, making it difficult to match the diverse interaction needs of smart terminals.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a brushless DC vibration motor, comprising a motor body, a wiring terminal provided on the outer side of the motor body, a rotating frame provided inside the motor body, a rotor body fixed on the outer wall of the rotating frame, a samarium cobalt magnet sheet fixed on the outer wall of the rotor body, and a stator body provided on the inner wall of the motor body; A fixing frame is fixed to the inner wall of the motor body. An inner ratchet ring is fixed to one end of the fixing frame. A toothed block is fixed to the inner wall of the inner ratchet ring. A connecting block is fixed to the outer wall of the rotating frame. A movable block is rotatably connected to the outer wall of the connecting block via a rotating shaft. A connecting rod is fixed to the lower end of the movable block. A movable rod is connected to the outer wall of the connecting rod via an elastic component. A pawl is fixed to the end of the movable rod. Locking pin bodies connected to the movable rod via electromagnetic components are provided on both sides of the movable rod. Limiting components for preventing collisions are provided on both sides of the movable block.

[0006] Preferably, bearing bodies are fixed at both ends inside the motor body, and the rotating frame is located inside the bearing bodies.

[0007] Preferably, the samarium cobalt magnet sheet has elasticity and pre-magnetization to form a magnetic reed, and the stator body adopts a high-performance neodymium iron boron permanent magnet as the stator magnetic pole, and the position of the stator magnetic pole corresponds to the magnetic reed on the rotor.

[0008] Preferably, the elastic component includes a first spring fixed to the lower end of the connecting rod, the movable rod being slidably connected to the outer wall of the connecting rod, and the other end of the first spring being fixedly connected to the movable rod.

[0009] Preferably, the inner ring of the first spring is provided with a first telescopic rod, and the two ends of the first telescopic rod are fixedly connected to the connecting rod and the movable rod, respectively.

[0010] Preferably, a limiting groove is formed on the inner wall of the movable rod, and a guide block is slidably connected inside the limiting groove, and the guide block is fixedly connected to the connecting rod.

[0011] Preferably, the electromagnetic component includes slide rail brackets fixed on both sides of the movable rod, an electromagnet body is fixed to one end of the slide rail bracket, a telescopic spring is fixed to one end of the electromagnet body, and a locking pin body is fixedly connected to the other end of the telescopic spring, and the locking pin body is slidably connected to the slide rail bracket.

[0012] Preferably, the limiting component includes a second limiting rod rotatably connected to both sides of the movable block via a rotating shaft, a first limiting rod rotatably connected to the lower end of the connecting block via a rotating shaft, the second limiting rod being slidably connected inside the first limiting rod, a second spring being fixed to one end of the second limiting rod, the other end of the second spring being fixedly connected to the first limiting rod, a second telescopic rod being provided in the inner ring of the second spring, and the second telescopic rod being fixedly connected to both the first and second limiting rods.

[0013] Beneficial effects This invention provides a brushless DC vibration motor. Compared with the prior art, it has the following advantages: Firstly, this invention transforms continuous rotation into instantaneous pulse impact through the meshing of the internal ratchet ring, tooth block, and pawl, generating high-quality, high-intensity "click"-like tactile feedback that far surpasses the rotational vibration texture of traditional ERM motors. Furthermore, the first spring and the first telescopic rod form a "centrifugal clutch," ensuring that strong impacts are only generated at high speeds, thus decoupling vibration intensity from rotational speed. This effectively buffers accidental triggering impacts at low speeds, protecting the mechanism. Moreover, a "mechanical buffer layer" is established between the moving block and the rotor body through the limiting component, greatly reducing the impact force and noise of the moving block colliding with the body during its extension and retraction. This effectively solves the problem of material fatigue and damage caused by inertial collisions, significantly improving the durability and service life of the impact mechanism.

[0014] Secondly, when the rotor of this invention rotates, the pre-magnetized elastic samarium cobalt magnets periodically sweep across the fixed stator body. At the moment of passing the magnetic poles, the magnetic reeds are subjected to strong attractive or repulsive pulses. When the frequency of this pulse matches the natural frequency of the magnetic reeds, it will excite them to generate large-amplitude bending resonance. The resonant motion of multiple magnetic reeds amplifies their tiny deformation and directly transmits the vibration energy to the rotor body and the outer shell, generating a high-frequency, delicate auxiliary vibration. The samarium cobalt magnets have the dual functions of "permanent magnet" and "elastic body", simplifying the structure and realizing the "magnetic reed resonance amplification" effect. They can generate large-amplitude mechanical vibration with a small magnetic energy input. The interaction between the magnetic reeds and the stator magnetic poles is "non-contact", without friction and wear, which greatly extends the service life of the motor.

[0015] Thirdly, when the electromagnet body is energized, it generates magnetic force, attracting the locking pin body to retract inward against the elastic force of the telescopic spring. The locking pin then releases its constraint on the movable rod, allowing the impact mechanism to operate freely in "pulse mode." When the electromagnet body is de-energized, the magnetic force disappears, and the telescopic spring pushes the locking pin body outward, inserting it into the path of the movable rod and mechanically locking it. Even if the rotor rotates, the impact mechanism cannot move, and the motor only generates weak magnetic spring vibration or remains completely silent in "silent mode." This electromagnetic component realizes "digital signal control of mechanical function on / off." By simply energizing and de-energizing, it can switch between two tactile modes: "strong pulse" and "gentle continuous," greatly enriching the tactile expression capabilities. The "power-off locking" fail-safe design ensures that in the event of a circuit failure, the motor will revert to the more powerful pulse mode, guaranteeing the reliability of the basic tactile feedback. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the motor body of the present invention; Figure 3This is a schematic diagram of the samarium cobalt magnet sheet structure of the present invention; Figure 4 This is a schematic diagram of the internal ratchet ring structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the movable rod of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the first limiting rod connection structure of the present invention.

[0017] In the diagram: 1. Motor body; 2. Terminal block; 3. Bearing body; 301. Rotating frame; 302. Rotor body; 303. Samarium cobalt magnet sheet; 304. Stator body; 4. Fixing frame; 401. Inner ratchet ring; 402. Tooth block; 403. Connecting block; 5. Movable block; 501. Connecting rod; 502. First spring; 503. First telescopic rod; 504. Movable rod; 505. Pawl; 6. Limiting groove; 601. Guide block; 7. Slide rail bracket; 701. Electromagnet body; 702. Locking pin body; 703. Telescopic spring; 8. First limiting rod; 801. Second limiting rod; 802. Second spring; 803. Second telescopic rod. Detailed Implementation

[0018] The technical solutions of 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.

[0019] Please see Figures 1-7 The present invention provides a technical solution: a brushless DC vibration motor, including a motor body 1, a wiring terminal 2 provided on the outer side of the motor body 1, a rotating frame 301 provided inside the motor body 1, a rotor body 302 fixed on the outer wall of the rotating frame 301, a samarium cobalt magnet sheet 303 fixed on the outer wall of the rotor body 302, and a stator body 304 provided on the inner wall of the motor body 1. A fixing frame 4 is fixed to the inner wall of the motor body 1. An inner ratchet ring 401 is fixed to one end of the fixing frame 4. A tooth block 402 is fixed to the inner wall of the inner ratchet ring 401. A connecting block 403 is fixed to the outer wall of the rotating frame 301. A movable block 5 is rotatably connected to the outer wall of the connecting block 403 via a rotating shaft. A connecting rod 501 is fixed to the lower end of the movable block 5. A movable rod 504 is connected to the outer wall of the connecting rod 501 via an elastic component. A pawl 505 is fixed to the end of the movable rod 504. Locking pin bodies 702 connected to the movable rod 504 via electromagnetic components are provided on both sides of the movable rod 504. Limiting components for preventing collisions are provided on both sides of the movable block 5.

[0020] In a preferred embodiment, bearing bodies 3 are fixed at both ends inside the motor body 1. A rotating frame 301 is located inside the bearing body 3. Samarium cobalt magnet sheets 303 are elastic and pre-magnetized to form magnetic reeds. The stator body 304 uses high-performance neodymium iron boron permanent magnets as stator poles. The positions of the stator poles correspond to the magnetic reeds on the rotor. When the rotor rotates, the pre-magnetized elastic samarium cobalt magnet sheets 303 periodically pass over the fixed stator poles of the stator body 304. At the instant of passing the poles, the magnetic reeds experience strong attractive or repulsive pulses. When the frequency of this pulse matches the magnetic reed... When the natural frequency of the reed is matched, it will be excited to produce a large-amplitude bending resonance. The resonant motion of multiple magnetic reeds amplifies its tiny deformation and directly transmits the vibration energy to the rotor body 302 and the outer shell, generating a high-frequency, delicate auxiliary vibration. The 303 samarium cobalt magnetic steel sheet has the dual functions of "permanent magnet" and "elastic body", which simplifies the structure and realizes the "magnetic reed resonance amplification" effect. It can generate a large-amplitude mechanical vibration with a small magnetic energy input. The interaction between the magnetic reed and the stator magnetic pole is "non-contact", without friction and wear, which greatly extends the service life of the motor.

[0021] The bearing body 3 ensures the high-speed and stable rotation of the rotating frame 301, providing a stable power foundation for centrifugal impact and magnetic reed resonance, and reducing noise and vibration instability. In a preferred embodiment, the elastic component includes a first spring 502 fixed at the lower end of the connecting rod 501, a movable rod 504 slidably connected to the outer wall of the connecting rod 501, the other end of the first spring 502 fixedly connected to the movable rod 504, a first telescopic rod 503 provided in the inner ring of the first spring 502, the two ends of the first telescopic rod 503 being fixedly connected to the connecting rod 501 and the movable rod 504 respectively, a limiting groove 6 is provided in the inner wall of the movable rod 504, a guide block 601 is slidably connected inside the limiting groove 6, the guide block 601 is fixedly connected to the connecting rod 501, an alternating current is passed through the stator body 304 to generate a rotating magnetic field, which interacts with the samarium cobalt magnet 303 on the rotor, driving the rotor body 302 and the rotating frame 301 fixed thereto to rotate at high speed, the centrifugal force generated by the rotation causes the movable block 5 to be thrown outward around the rotation axis, the movable block 5 drives the entire movable rod 504 and the pawl 505 to move outward through the connecting rod 501, so that the pawl 505 enters the range that can mesh with the tooth block 402.

[0022] Furthermore, when the rotor rotates to a specific angle, the pawl 505 violently engages with the tooth block 402 on the fixed inner ratchet ring 401. The engagement generates a huge, instantaneous braking torque. This braking torque is transmitted to the entire motor body 1 housing through the connecting block 403, the rotating frame 301, and the bearing body 3, converting the rotor's angular momentum into an impact force on the housing, producing a crisp "click" vibration. Specifically, when the movable block 5 is thrown out, the connecting rod 501 pushes the movable rod 504 and the pawl 505 to move towards the toothed block 402. If the rotation speed is not high enough, the centrifugal force is not enough to completely overcome the elastic force of the first spring 502. Therefore, the pawl 505 will not have a strong impact with the toothed block 402, but will have a buffer contact. When the rotation speed is high enough, the centrifugal force is huge, the first spring 502 is stretched, and the movable rod 504 moves to the limit position. At this time, the pawl 505 will achieve rigid engagement with the toothed block 402 and generate the maximum impact force. The guide block 601 slides within the limiting groove 6 to ensure that the movable rod 504 always moves in a straight line.

[0023] In a preferred embodiment, the electromagnetic component includes slide rail brackets 7 fixed on both sides of the movable rod 504. An electromagnet body 701 is fixed to one end of each slide rail bracket 7, and a telescopic spring 703 is fixed to one end of the electromagnet body 701. A locking pin body 702 is fixedly connected to the other end of the telescopic spring 703, and the locking pin body 702 is slidably connected to the slide rail bracket 7. When the electromagnet body 701 is energized, it generates magnetic force, attracting the locking pin body 702 to retract inward against the elastic force of the telescopic spring 703. The locking pin then releases its constraint on the movable rod 504, allowing the impact mechanism to operate freely in "pulse mode." When the electromagnet body 701 is de-energized, the magnetic force disappears. The telescopic spring 703 pushes the locking pin body 702 outward to insert into the path of the movable rod 504, mechanically locking it. At this time, even if the rotor rotates, the impact mechanism cannot move, and the motor only produces a weak magnetic spring vibration or is completely silent, which is the "silent mode". This electromagnetic component realizes the "digital signal on / off control of mechanical function". By simply turning on and off the power, it can switch between two tactile modes: "strong pulse" and "gentle continuous", which greatly enriches the tactile expression ability. It adopts a "power-off locking" fail-safe design. In case of circuit failure, the motor will restore the stronger pulse mode, ensuring the reliability of basic tactile feedback.

[0024] In a preferred embodiment, the limiting component includes a second limiting rod 801 rotatably connected to both sides of the movable block 5 via a rotating shaft, and a first limiting rod 8 rotatably connected to the lower end of the connecting block 403 via a rotating shaft. The second limiting rod 801 is slidably connected inside the first limiting rod 8. A second spring 802 is fixed to one end of the second limiting rod 801, and the other end of the second spring 802 is fixedly connected to the first limiting rod 8. A second telescopic rod 803 is provided on the inner ring of the second spring 802, and the second telescopic rod 803 is fixedly connected to both the first limiting rod 8 and the second limiting rod 801. When the movable block 5 is thrown out or retracted... When the moving block 5 is about to reach its limit position, it will cause the second limit rod 801 to slide inward into the first limit rod 8, compressing the second spring 802. The compression process of the second spring 802 smoothly absorbs the kinetic energy of the moving block 5, causing its speed to decrease smoothly. When the second telescopic rod 803 reaches its maximum stroke, it provides the final hard limit to prevent overshoot. A "mechanical buffer layer" is established between the moving block 5 and the rotor body, which greatly reduces the impact force and noise of the moving block colliding with the body when it is thrown out and retracted. It effectively solves the problem of material fatigue and damage caused by inertial collision, and significantly improves the durability and service life of the impact mechanism.

[0025] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0026] During operation, alternating current is applied to the stator body 304 to generate a rotating magnetic field, which interacts with the samarium cobalt magnets 303 on the rotor, driving the rotor body 302, supported by the rotating frame 301 and the bearing body 3, to rotate at high speed. During rotation, the samarium cobalt magnets 303 periodically sweep across the magnetic poles of the stator body 304, and are excited by pulsed magnetic force to generate high-frequency resonance, thereby transmitting the delicate vibration to the outer shell. Simultaneously, centrifugal force causes the movable block 5 to swing outward around the rotating shaft on the connecting block 403, and pushes the movable rod 504 and pawl 505 outward through the connecting rod 501. At this time, if the electromagnet body 701 is energized, the locking pin body 702 will retract to unlock the movable rod 504, causing the system to enter "pulse mode". Conversely, if the power is off, the locking pin 702 will extend under the action of the telescopic spring 703 to lock the movable rod 504, causing the system to enter "silent mode". In pulse mode, when the speed is high enough, the centrifugal force overcomes the resistance of the first spring 502, causing the movable rod 504 to move along the guide block 60. When the guide of the limiting groove 6 reaches the limit position, the pawl 505 violently meshes with the tooth block 402 of the inner ratchet ring 401 fixed on the fixed frame 4, generating an instantaneous braking torque. This torque is transmitted to the outer shell of the motor body 1 through the connecting block 403 and the rotating frame 301, and is converted into strong impact vibration. During the entire movement, the limiting assembly composed of the first limiting rod 8, the second limiting rod 801, the second spring 802 and the second telescopic rod 803 absorbs the kinetic energy of the moving block 5 through elastic buffering, effectively preventing it from rigidly colliding with the rotor body and ensuring the durability of the mechanism.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brushless DC vibration motor comprising a motor body (1), the outer side of the motor body (1) is provided with a terminal (2), characterized in that: The inside of the motor body (1) is provided with a rotating frame (301), the outer wall of the rotating frame (301) is fixed with a rotor body (302), the outer wall of the rotor body (302) is fixed with a samarium-cobalt magnetic steel sheet (303), and the inner wall of the motor body (1) is provided with a stator body (304). The inner wall of the motor body (1) is fixed with a fixed frame (4), one end of the fixed frame (4) is fixed with an inner ratchet ring (401), the inner wall of the inner ratchet ring (401) is fixed with a tooth block (402), the outer wall of the rotating frame (301) is fixed with a connecting block (403), the outer wall of the connecting block (403) is provided with a movable block (5) connected by a rotating shaft, the lower end of the movable block (5) is fixed with a connecting rod (501), the outer wall of the connecting rod (501) is provided with a movable rod (504) connected by an elastic assembly, the end of the movable rod (504) is fixed with a pawl (505), and the two sides of the movable rod (504) are provided with a lock pin body (702) connected by an electromagnetic assembly. The two sides of the movable block (5) are provided with a limiting assembly for preventing collision.

2. A brushless DC vibration motor as claimed in claim 1, characterized in that: The inside of the motor body (1) is fixed with a bearing body (3), and the rotating frame (301) is located in the inside of the bearing body (3).

3. A brushless DC vibration motor as claimed in claim 1, wherein: The samarium-cobalt magnetic steel sheet (303) has elasticity and pre-magnetization to form a magnetic reed, and the stator body (304) adopts a high-performance neodymium-iron-boron permanent magnet as a stator magnetic pole, and the position of the stator magnetic pole corresponds to the magnetic reed on the rotor.

4. A brushless DC vibration motor as claimed in claim 1, wherein: The elastic assembly comprises a first spring (502) fixed at the lower end of the connecting rod (501), and the movable rod (504) is in sliding connection with the outer wall of the connecting rod (501).

5. A brushless DC vibration motor as claimed in claim 4, wherein: The inner ring of the first spring (502) is provided with a first telescopic rod (503), and the two ends of the first telescopic rod (503) are fixedly connected with the connecting rod (501) and the movable rod (504) respectively.

6. A brushless DC vibration motor as claimed in claim 1, wherein: The inner wall of the movable rod (504) is provided with a limiting groove (6), and a guide block (601) is in sliding connection in the limiting groove (6).

7. A brushless DC vibration motor as claimed in claim 1, wherein: The electromagnetic assembly comprises slide rail supports (7) fixed on the two sides of the movable rod (504), one end of the slide rail support (7) is fixed with an electromagnet body (701), one end of the electromagnet body (701) is fixed with a telescopic spring (703), the lock pin body (702) is fixedly connected at the other end of the telescopic spring (703), and the lock pin body (702) is in sliding connection with the slide rail support (7).

8. A brushless DC vibration motor as claimed in claim 1, wherein: The limiting assembly comprises second limiting rods (801) rotatably connected through rotating shafts on both sides of a movable block (5), a lower end of the connecting block (403) is provided with a first limiting rod (8) rotatably connected through a rotating shaft, the second limiting rod (801) is slidably connected inside the first limiting rod (8), one end of the second limiting rod (801) is fixedly provided with a second spring (802), the other end of the second spring (802) is fixedly connected with the first limiting rod (8), and the inner ring of the second spring (802) is provided with a second telescopic rod (803) which is fixedly connected with the first limiting rod (8) and the second limiting rod (801) respectively.

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