Flat vibration motor
The non-straight-line edges between commutator segments and a multi-point brush contact configuration address the brush wear and debris accumulation problems in micro-vibration motors, improving reliability and lifespan.
Patent Information
- Application Number
- CN202422301813.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-20
AI Technical Summary
In the prior art, wear between the brush and the commutator leads to a backlog of debris, resulting in poor contact and open motor problems, affecting the service life of the flat vibrating motor.
A non-linear edge commutation sheet spacer and bent section group are designed to avoid the free end point contact interval of the brush, and conductively connect to the commutation sheet through multiple brush claws to enhance contact reliability.
It extends the service life of the flat vibrating motor, avoids poor contact caused by debris backlog and open motor problems, and improves the reliability of conductive connections.
Smart Images
Figure CN223109779U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a flat vibration motor. Background Art
[0002] With the increasing use of smart terminals, the application fields of device vibration are expanding day by day. For example, for the simulation and touch effects of games, it is applied to smart phones; it is used as a reminder function in earphones, electronic cigarettes, and various wearable electronic instruments. The above-mentioned electronic products focus on miniaturization, low power consumption, and long service life. Therefore, micro vibration motors are usually used to respond to vibration requirements.
[0003] The vibration of the vibration motor relies on the friction and conductive contact between the carbon brush and the commutator to make the current flow into the coil, thereby generating a magnetic field and electromagnetic force, and then driving the rotor to rotate. Specifically, the direct current passes through the sliding contact between the carbon brush and the commutator to make the current flow into the coil. The energized coils of different windings cut the magnetic force lines in the permanent magnetic field formed by the stator assembly to generate electromagnetic force. The torque formed by this electromagnetic force causes the rotor to rotate. The current flowing through the carbon brush acts through the commutator to make this process cycle, realizing the perpetual motion of the rotor.
[0004] However, the carbon brush is continuously worn during the working process, making it easy for foreign matters such as debris to exist on the carbon brush claws. In the related art, the interval area between the two poles of the commutator segment is usually linear, which is easy to accumulate debris, and there is a point contact between the carbon brush claws and the interval area between the two poles during commutation, resulting in problems such as poor contact and motor open circuit. Summary of the Utility Model
[0005] In order to solve the deficiencies of the existing technology, the utility model provides a flat vibration motor, which avoids the problem of poor contact and motor open circuit caused by the free end point of the brush body contacting the interval area during motor commutation.
[0006] The technical effects to be achieved by the utility model are realized through the following technical solutions:
[0007] The utility model provides a flat vibration motor, including:
[0008] A housing assembly, with a central shaft connected at the center;
[0009] A stator assembly, arranged inside the housing assembly and sleeved on the central shaft;
[0010] A rotor assembly is disposed inside the housing assembly and sleeved on the central shaft. The rotor assembly includes a bearing and a commutator. The bearing is sleeved on the central shaft, and the commutator is sleeved on the bearing. The commutator includes a plurality of commutator segments arranged at intervals. An interval area is formed between the plurality of commutator segments, and the adjacent edges between two commutator segments are non-linear edges; and
[0011] A brush assembly includes a brush body. The brush body has a free end for abutting against the commutator segment, and the free end abuts against at least two commutator segments at any moment.
[0012] In some implementation manners, the interval area extends in the radial direction of the rotor assembly and has a set of bent segments.
[0013] In some implementation manners, the set of bent segments includes a first bent segment and a second bent segment, and the bending direction of the first bent segment is opposite to that of the second bent segment.
[0014] In this implementation manner, the first bent segment and the second bent segment together form an S-shaped line, ensuring the reliability of the bending of the edge of the interval area, and further ensuring that the free end of the brush body does not make point contact with the interval area.
[0015] In some implementation manners, the distance between adjacent non-linear edges is equal.
[0016] In some implementation manners, the brush assembly further includes a first circuit board connected to the housing assembly. The brush body further has a fixed end connected to the first circuit board, and the free end is provided with a plurality of brush claws that are bent to abut against the commutator segments.
[0017] In this implementation manner, the plurality of brush claws are respectively bent to abut against the commutator segments of two different electrodes to achieve conductive connection between the brush body and the commutator segments.
[0018] In some implementation manners, a connecting portion that fits the first circuit board extends at the connection of the brush body and the first circuit board. An included angle is formed between the connecting portion and the brush body, and the included angle is any value between 90° and 170°.
[0019] In some implementation manners, the rotor assembly further includes a second circuit board, a coil, and a fixing member. The fixing member is sleeved on the bearing;
[0020] The second circuit board, the commutator, and the coil are respectively connected to the fixing member, and the coil is electrically connected to the second circuit board; the second circuit board is connected to the commutator, the second circuit board is slidably connected to the free end of the brush body through the commutator, and the second circuit board is slidably connected to the first circuit board through the brush body.
[0021] In some implementations, the rotor assembly further includes a vibrator, and the vibrator is mounted on the fixing member and located between several of the coils.
[0022] In some implementations, the housing assembly includes a first housing and a second housing. The first housing is connected to the second housing, and together they form a receiving space for accommodating the rotor assembly, the stator assembly, and the brush assembly. An annular protrusion for sleeving the central shaft is formed at the center of the second housing.
[0023] In some implementations, the housing assembly further includes a gasket. A groove is formed at the center of the first housing, and a protrusion is formed at the periphery of the groove. An installation portion extending from the center of the gasket is installed in the groove. A counterbore for mating and clamping with the protrusion is formed at the periphery of the installation portion; a shaft hole for installing the central extraction is formed on the side of the installation portion facing away from the groove; the bearing abuts against the gasket.
[0024] In some implementations, the central shaft and / or the bearing is made of ceramic material.
[0025] In this implementation, the problem that debris is generated during the rotational friction between the central shaft and the bearing, resulting in an increase in the resistance of the flat vibration motor, is avoided.
[0026] In summary, the present utility model has at least the following advantages:
[0027] For the flat vibration motor provided by the present utility model, since the adjacent edges between the two commutator segments are non-linear edges, the edges of the interval region formed between the commutator segments of two different electrodes are non-linear edges, avoiding the problem that the free end of the brush body contacts the interval region during motor commutation, resulting in poor contact and motor open circuit; at the same time, the non-linear edges also avoid the problem that debris generated during the operation of the flat vibration motor accumulates in the interval region, resulting in poor contact between the brush body and the commutator, thereby extending the service life of the flat vibration motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 is a schematic structural diagram of the flat vibration motor of Embodiment 1;
[0029] Figure 2 is Figure 1 a partial schematic diagram of the flat vibration motor shown at A;
[0030] Figure 3 is Figure 2 a schematic structural diagram of the first bending section and the second bending section shown;
[0031] Figure 4Schematic structural diagram of the flat vibration motor in Embodiment 2;
[0032] Figure 5 is Figure 4 Schematic structural diagram of the brush body and the connecting part shown;
[0033] Figure 6 Schematic structural diagram of the rotor assembly in Embodiment 2;
[0034] Figure 7 is Figure 6 Partial schematic diagram of the rotor assembly at B shown;
[0035] Figure 8 Schematic structural diagram of the flat vibration motor in Embodiment 3;
[0036] Figure 9 is Figure 8 Partial schematic diagram of the flat vibration motor at C shown;
[0037] Figure 10 Schematic structural diagram of the first housing and the gasket in Embodiment 3;
[0038] Figure 11 is Figure 8 Cross-sectional schematic diagram of the flat vibration motor shown.
[0039] Markings in the figure:
[0040] 1. Housing assembly; 11. Central axis; 12. First housing; 121. Groove; 1211. Bump; 13. Second housing; 131. Annular protrusion; 14. Accommodation space; 15. Gasket; 151. Mounting part; 1511. Counterbore; 1512. Shaft hole;
[0041] 2. Stator assembly;
[0042] 3. Rotor assembly; 31. Bearing; 32. Commutator; 321. Commutator segment; 322. Spacing area; 3221. Bend segment group; 322a. First bend segment; 322b. Second bend segment; 33. Second circuit board; 34. Coil; 35. Fixing part; 36. Vibration element;
[0043] 4. Brush assembly; 41. Brush body; 411. Free end; 4111. Brush claw; 412. Fixed end; 413. Connecting part; 42. First circuit board. Detailed implementation manners
[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments of the present utility model.
[0045] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0046] Example 1:
[0047] Please refer to the attached Figures 1 - 3 , the flat vibration motor of the present utility model includes a housing assembly 1, a rotor assembly 3, a stator assembly 2, and a brush assembly 4.
[0048] Among them, please combine Figure 1 and Figure 2 , Figure 1 illustrates the structural relationship among the housing assembly 1, the stator assembly 2, the rotor assembly 3, and the brush assembly 4 in the embodiment of the present utility model, Figure 2 illustrates the structural relationship between the brush body 41 and the commutator segment 321 in the embodiment of the present utility model. Specifically, a central shaft 11 is connected at the center of the housing assembly 1; the stator assembly 2 is disposed inside the housing assembly 1 and sleeved on the central shaft 11; the rotor assembly 3 is disposed inside the housing assembly 1 and sleeved on the central shaft 11; so that the stator assembly 2 and the rotor assembly 3 are fixed inside the housing assembly 1, and the housing assembly 1 plays a protective role for the stator assembly 2 and the rotor assembly 3, avoiding the problem that the stator assembly 2 and the rotor assembly 3 rub against external devices during operation, thereby causing failures. The rotor assembly 3 includes a bearing 31 and a commutator 32. The bearing 31 is sleeved on the central shaft 11, and the commutator 32 is sleeved on the bearing 31, so that a rotatable connection is formed between the commutator 32 and the central shaft 11, thereby ensuring the reliability of the commutator 32. The commutator 32 includes a plurality of commutator segments 321 arranged at intervals, an interval area 322 is formed between the plurality of commutator segments 321, and the adjacent edges between two commutator segments 321 are non-linear edges; the brush assembly 4 includes a brush body 41, and the brush body 41 has a free end 411 for abutting against the commutator segment 321, and the free end 411 abuts against at least two commutator segments 321 at any moment.
[0049] In this embodiment, two adjacent commutator segments 321 are commutator segments 321 of different electrodes. When the flat vibration motor starts to work, the commutator 32 continuously rotates around the central axis 11 through the bearing 31, thereby driving a plurality of commutator segments 321 to rotate. The free ends 411 of the brush body 41 respectively abut against two commutator segments 321 of different electrodes that are continuously rotating. Since the adjacent edges between the two commutator segments 321 are non-linear edges, the edge of the spacer region 322 formed between the commutators 32 of different electrodes is a non-linear edge. In this way, it is possible to prevent the free end 411 of the brush body 41 from coming into point contact with the spacer region 322, that is, to prevent the free end 411 of the brush body 41 from coming into point contact with the gap between the two commutators 32, ensuring that the free end 411 abuts against the commutator segments 321 of two different electrodes at the same time, thereby avoiding problems such as poor contact and motor open circuit and improving the service life of the flat vibration motor. Further, during the continuous friction between the brush body 41 and the commutator segments 321, debris will gradually be generated. The non-linear edge of the spacer region 322 can prevent the debris from accumulating in the spacer region 322, resulting in interference with the normal operation of the brush body 41 and further causing a problem of poor contact between the brush body 41 and the commutator 32. Specifically, if there is debris in the spacer region 322, when the free end 411 of the brush body 41 passes through the spacer region 322, the debris is likely to adhere to the free end 411 of the brush body 41, which is likely to cause poor contact between the brush body 41 and the commutator 32.
[0050] It can be understood that in the related art, the adjacent edges between the two commutator segments 321 are linear edges. During the rotation of the commutator 32, the free end 411 of the brush body 41 is extremely likely to get stuck in the gap between the two commutator segments 321, that is, the free end 411 of the brush body 41 comes into point contact with the spacer region 322, and debris is likely to accumulate in the spacer region 322, easily causing the brush body 41 to get stuck in the spacer region 322, thereby resulting in problems such as poor contact and motor open circuit.
[0051] For the above flat vibration motor, since the adjacent edges between the two commutator segments 321 are non-linear edges, the edge of the spacer region 322 formed between the two commutator segments 321 of different electrodes is a non-linear edge, avoiding the problem that the free end 411 of the brush body 41 comes into point contact with the spacer region 322 during motor commutation, resulting in poor contact and motor open circuit; at the same time, the non-linear edge also prevents debris generated during the operation of the flat vibration motor from accumulating in the spacer region 322, resulting in poor contact between the brush body 41 and the commutator 32, thereby extending the service life of the flat vibration motor.
[0052] In some preferred embodiments, the spacer 322 extends in the radial direction of the rotor assembly 3 and has a set of bent segments 3221. Specifically, the spacer 322 extends in the radial direction of the commutator 32. A plurality of commutator segments 321 are arranged along the circumferential direction of the commutator 32. The spacer 322 is provided with a set of bent segments 3221, such that the adjacent edges between two commutator segments 321 are in a bent line shape, ensuring that the free end 411 of the brush body 41 abuts against the commutator segments 321 of two different electrodes simultaneously, thereby avoiding the problem of poor contact between the brush body 41 and the commutator 32 caused by the point contact of the free end 411 with the spacer 322.
[0053] In some preferred embodiments, please refer to Figure 3 , Figure 3 which shows the structural relationship between the first bent segment 322a and the second bent segment 322b in the embodiment of the present invention. Specifically, the set of bent segments 3221 includes the first bent segment 322a and the second bent segment 322b, and the bending direction of the first bent segment 322a is opposite to that of the second bent segment 322b. The first bent segment 322a and the second bent segment 322b together form an S-shaped line, ensuring the reliability of the bending of the edge of the spacer 322, and further ensuring that the free end 411 of the brush body 41 does not make point contact with the spacer 322. It can be understood that the first bent segment 322a and the second bent segment 322b can be curves and / or broken lines.
[0054] In some more preferred embodiments, the distance between two adjacent non-straight edges is equal. That is, two adjacent non-straight edges are parallel to each other, further ensuring the contact reliability between the brush body 41 and the commutator segment 321, and avoiding the free end 411 being stuck in the spacer 322 during the commutation process of the motor. It can be understood that if the distance between two adjacent non-straight edges is not equal, it is easy to cause the free end 411 of the brush body 41 to be stuck in the spacer 322, thereby causing problems such as poor contact and motor open circuit.
[0055] Embodiment 2:
[0056] The difference between this embodiment and Embodiment 1 is that in this embodiment, further structural optimization is performed on the flat vibration motor of the present invention. Please refer to the attached Figures 4 - 7 .
[0057] Among them, please refer to Figure 4 , Figure 4 which shows the structural relationship between the first circuit board 42, the brush body 41 and the commutator segment 321 in the embodiment of the present invention. Specifically, the brush assembly 4 further includes a first circuit board 42 connected to the housing assembly 1. The brush body 41 further has a fixed end 412 connected to the first circuit board 42, and the free end 411 is provided with a plurality of brush claws 4111 that are bent and abut against the commutator segment 321.
[0058] In this embodiment, the fixed end 412 fixes the brush body 41 on the first circuit board 42, and the first circuit board 42 is electrically connected to the commutator segment 321 through the brush body 41. Specifically, a plurality of brush claws 4111 are bent and abutted against the commutator segments 321 of two different electrodes respectively to achieve the electrical connection between the brush body 41 and the commutator segment 321. The bending and abutting can avoid damage to the commutator segment 321 caused by the brush claws 4111 during the commutation process, and increase the contact area between the brush claws 4111 and the commutator segment 321, making the electrical conduction effect stronger. Preferably, there are at least four brush claws 4111, so that there are two brush claws 4111 electrically connected to the commutator segments 321 of different electrodes respectively. In this way, even if one of the brush claws 4111 touches the spacer 322, there is another brush claw 4111 electrically connected to the commutator segment 321, further ensuring the reliability of the electrical connection between the brush body 41 and the commutator segment 321. In this embodiment, the free end 411 is provided with four brush claws 4111. Preferably, there are two pairs of brush bodies 41 arranged opposite to each other.
[0059] In some preferred embodiments, please refer to Figure 5 , Figure 5 which shows the structural relationship between the brush body 41 and the connecting portion 413 in the embodiment of the present invention. Specifically, a connecting portion 413 that fits on the first circuit board 42 extends at the connection of the brush body 41 to the first circuit board 42. An included angle is formed between the connecting portion 413 and the brush body 41, and the included angle is any value between 90° and 170°. It provides a certain supporting force for the brush claws 4111 to be bent and abutted against the commutator segment 321, ensuring that the brush claws 4111 continuously abut against the commutator segment 321 during the commutation process, and further ensuring the reliability of the electrical connection between the brush body 41 and the commutator segment 321.
[0060] In some preferred embodiments, please combine Figure 6 and Figure 7 , Figure 6 and Figure 7 which shows the structural relationship between the rotor assembly 3 and the brush assembly 4 in the embodiment of the present invention. Specifically, the rotor assembly 3 further includes a second circuit board 33, a coil 34 and a fixing member 35. The fixing member 35 is sleeved on the bearing 31. The second circuit board 33, the commutator 32 and the coil 34 are respectively connected to the fixing member 35, and the coil 34 is electrically connected to the second circuit board 33. The second circuit board 33 is connected to the commutator 32, and the second circuit board 33 is slidably connected to the free end 411 of the brush body 41 through the commutator 32, and the second circuit board 33 is slidably connected to the first circuit board 42 through the brush body 41. The second circuit board 33, the coil 34, the commutator 32, the fixing member 35 and the bearing 31 are integrally formed by injection molding to improve the overall structural tightness. A plurality of coils 34 are connected to the circuit on the second circuit board 33 in series so that the coils 34 are energized to generate a magnetic field.
[0061] Further, the rotor assembly 3 further includes a vibrator 36, and the vibrator 36 is mounted on the fixing member 35 and located between a plurality of coils 34. The vibrator 36 performs eccentric vibration. When the flat vibration motor of this embodiment operates: an external power supply enters the motor through the solder joints on the first circuit board 42, passes through the brush body 41 to the commutator segment 321, and then is connected to the coil 34 through the circuit on the second circuit board 33, causing the coil 34 to generate a magnetic field; this magnetic field interacts with the magnetic field generated by the permanent magnet on the stator assembly 2, thereby promoting the rotation of the rotor assembly 3, and at the same time driving the vibrator 36 to rotate, and centrifugal inertial force is generated by the rotating vibrator 36, thereby generating vibration. This vibration can be transmitted to the mechanical system through the connector, thereby achieving the purpose of vibration. For example, it can be transmitted to the user through the communication system fixed to the housing assembly 1, thereby reminding the user that there is an incoming external message. In this embodiment, the vibrator 36 is made of heavy elements, and is integrally formed with the second circuit board 33, the coil 34, the commutator 32, the fixing member 35 and the bearing 31 by injection molding, and the vibrator 36 is disposed between two coils 34.
[0062] Embodiment 3:
[0063] The difference between this embodiment and Embodiment 2 is that this embodiment further optimizes the structure of the flat vibration motor of the present invention. Please refer to the attached Figures 8 - 11 .
[0064] Among them, please refer to Figure 8 . Figure 8 which shows the structural relationship between the first housing 12 and the second housing 13 in the embodiment of the present invention. Specifically, the housing assembly 1 includes a first housing 12 and a second housing 13. The first housing 12 is connected to the second housing 13, and a receiving space 14 for accommodating the rotor assembly 3, the stator assembly 2 and the brush assembly 4 is jointly formed. An annular convex portion 131 for sleeving the central shaft 11 is formed at the center of the second housing 13.
[0065] In this embodiment, the first housing 12 and the second housing 13 protect the rotor assembly 3, the stator assembly 2 and the brush assembly 4, avoiding the problem that the components inside the housing assembly 1 rub against the components outside the housing assembly 1 during the operation of the flat vibration motor, which may lead to malfunctions. The first housing 12 is connected to the second housing 13 by welding, making the overall structure more stable. The central shaft 11 is installed inside the annular convex portion 131, improving the connection stability between the central shaft 11 and the second housing 13, making the overall structure more compact. Moreover, it also ensures the concentricity between the central shaft 11 and the housing assembly 1, facilitating the installation of the central shaft 11 on the second housing 13, and thus ensuring the reliability of the flat vibration motor. Of course, the first housing 12 is not limited to being connected to the second housing 13 by welding, and it can also be connected by clamping, fitting or riveting.
[0066] In some preferred embodiments, please refer to Figures 9 - 11 , Figures 9 - 11 which shows the structural relationship among the first housing 12, the gasket 15 and the bearing 31 in the embodiment of the present invention. Specifically, the housing assembly 1 further includes a gasket 15. A groove 121 is formed at the center of the first housing 12, and a convex block 1211 is formed on the periphery of the groove 121. An installation portion 151 extending from the center of the gasket 15 is installed in the groove 121. A counterbore 1511 for mating and clamping with the convex block 1211 is formed on the periphery of the installation portion 151, making the connection between the gasket 15 and the first housing 12 more stable and the structure more compact. An axial hole 1512 for installing the central shaft is formed on the side of the installation portion 151 facing away from the groove 121, and the bearing 31 abuts against the gasket 15. The axial hole 1512 is arranged opposite to the annular convex portion 131 of the second housing 13. One end of the central shaft 11 is installed in the axial hole 1512, and the other end is installed in the annular convex portion 131, making both ends of the central shaft 11 located at the center of the housing assembly 1, improving the structural stability, and thus ensuring the reliability of the overall structure. The bearing 31 abutting against the gasket 15 plays a role in reducing noise.
[0067] In some more preferred embodiments, the central shaft 11 and / or the bearing 31 are made of ceramic material. This avoids the problem that debris is generated during the rotational friction between the central shaft 11 and the bearing 31, resulting in an increase in the resistance of the flat vibration motor, and also has a large vibration amount, less noise and strong wear resistance, thereby extending the service life of the flat vibration motor.
[0068] For the flat vibration motor of the present utility model, since the adjacent edges between the two commutator segments 321 are non-linear edges, the edge of the spacing area 322 formed between the commutator segments 321 of two different electrodes is a non-linear edge, which avoids the problem that the free end 411 of the brush body 41 comes into point contact with the spacing area 322 during the commutation of the motor, resulting in poor contact and motor open circuit; at the same time, the non-linear edge also avoids the problem that debris generated during the operation of the flat vibration motor accumulates in the spacing area 322, resulting in poor contact between the brush body 41 and the commutator 32, thereby extending the service life of the flat vibration motor.
[0069] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0070] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.
[0071] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0072] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being above or below the second feature may include the direct contact between the first and second features, or may include the contact between the first and second features not being direct but through additional features therebetween. Moreover, the first feature being above, over and on the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being under, below and beneath the second feature includes that the first feature is directly under and obliquely under the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.
[0073] Although the description of the present utility model is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included within the spirit and scope of the appended claims.
Claims
1. A flat vibration motor, characterized in that, Comprising: A housing assembly (1) with a central shaft (11) connected at the center; A stator assembly (2) disposed inside the housing assembly (1) and sleeved on the central shaft (11); A rotor assembly (3) disposed inside the housing assembly (1) and sleeved on the central shaft (11); the rotor assembly (3) includes a bearing (31) and a commutator (32), the bearing (31) is sleeved on the central shaft (11), the commutator (32) is sleeved on the bearing (31), the commutator (32) includes a plurality of commutator segments (321) arranged at intervals, an interval area (322) is formed between the plurality of commutator segments (321), and the adjacent edges between two commutator segments (321) are non-linear edges; and A brush assembly (4) including a brush body (41), the brush body (41) having a free end (411) for abutting against the commutator segment (321), and the free end (411) abuts against at least two commutator segments (321) at any moment.
2. The flat vibration motor according to claim 1, wherein, The interval area (322) extends in the radial direction of the rotor assembly (3) and has a bent segment group (3221).
3. The flat vibration motor according to claim 2, wherein The bent segment group (3221) includes a first bent segment (322a) and a second bent segment (322b), and the bending direction of the first bent segment (322a) is opposite to the bending direction of the second bent segment (322b).
4. The flat vibration motor according to claim 1, characterized in that The distance between adjacent non-linear edges is equal.
5. The flat vibration motor according to claim 1, wherein The brush assembly (4) further includes a first circuit board (42) connected to the housing assembly (1), the brush body (41) further has a fixed end (412) connected to the first circuit board (42), and the free end (411) is provided with a plurality of brush claws (4111) bent to abut against the commutator segment (321).
6. The flat vibration motor according to claim 5, wherein A connecting portion (413) that fits against the first circuit board (42) extends at the connection of the brush body (41) and the first circuit board (42), and an included angle is formed between the connecting portion (413) and the brush body (41), and the included angle is any value between 90° and 170°.
7. The flat vibration motor according to claim 5, wherein The rotor assembly (3) further includes a second circuit board (33), a coil (34) and a fixing member (35), and the fixing member (35) is sleeved on the bearing (31); The second circuit board (33), the commutator (32), and the coil (34) are respectively connected to the fixing member (35), and the coil (34) is electrically connected to the second circuit board (33); the second circuit board (33) is connected to the commutator (32), the second circuit board (33) is slidably connected to the free end (411) of the brush body (41) through the commutator (32), and the second circuit board (33) is slidably connected to the first circuit board (42) through the brush body (41).
8. The flat vibration motor according to claim 7, wherein The rotor assembly (3) further includes a vibrator (36), and the vibrator (36) is installed on the fixing member (35) and located between a plurality of coils (34).
9. The flat vibration motor according to claim 1, wherein The housing assembly (1) comprises a first housing (12) and a second housing (13); the first housing (12) is connected to the second housing (13) and together form a receiving space (14) for accommodating the rotor assembly (3), the stator assembly (2) and the brush assembly (4); an annular protrusion (131) for sleeve-engaging the central shaft (11) is formed at the center of the second housing (13).
10. The flat vibration motor according to claim 9, characterized in that The housing assembly (1) further comprises a gasket (15); a groove (121) is provided at the center of the first housing (12); a protrusion (1211) is formed on the periphery of the groove (121); a mounting portion (151) is extended from the center of the gasket (15) and is mounted on the groove (121); a sink (1511) is provided on the periphery of the mounting portion (151) and is engaged with the protrusion (1211); an axial hole (1512) for mounting the center drawer is provided on a side of the mounting portion (151) away from the groove (121); and the bearing (31) is in contact with the gasket (15).
11. The flat vibration motor according to claim 1, wherein The central shaft (11) and / or the bearing (31) are made of ceramic material.