Ultra-thin brushless flat vibration motor and implementation method thereof

Abstract

The present invention discloses an ultra-thin brushless flat vibration motor, comprising a lower bracket, a stator assembly disposed above the lower bracket, a core shaft disposed on the lower bracket, a rotor assembly disposed on the core shaft, a housing disposed on the upper end of the core shaft and sheathed around the rotor assembly, the lower bracket being a magnetic conductive member and having a plurality of hollow slots disposed thereon corresponding to the magnetic poles of a magnet. The present invention also discloses a method for implementing an ultra-thin brushless flat vibration motor. The present invention provides a plurality of hollow slots corresponding to the magnetic poles of the magnet on the lower bracket of a magnetic conductive material. This structure enables automatic resetting of the motor, effectively reducing the thickness of the lower bracket and thus the size of the motor. The present invention directly utilizes the magnet as a fixing member for the rotor assembly, eliminating the need for a bracket or other structure to secure the magnet and weight, thereby simplifying the motor structure and further reducing the size of the motor while reducing production costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of brushless flat vibration motors, and in particular relates to an ultra-thin brushless flat vibration motor and an implementation method thereof. Background Art

[0002] The brushless motor is a typical electric integrated product in modern times. Compared with the traditional brush motor, the brushless motor has the advantages of low noise, high energy efficiency and durability.

[0003] Brushless motors generally operate in a self-controlled manner, so under normal circumstances, they do not need to re-start the winding on the rotor like a synchronous motor that starts under heavy load under variable frequency speed regulation. This also means that it is unlikely to produce oscillations and loss of step when the load changes suddenly. This is its excellence and an important reason why it is used by the general public.

[0004] However, in order to reduce the number of Hall elements while ensuring the normal operation of the motor, the brushless flat motor in the existing technology needs to be equipped with a reset device. Most of the existing reset devices use a reset piece made of magnetic material embedded in a bracket made of non-magnetic material to achieve the reset function, which makes it impossible to reduce the size of the motor. Summary of the Invention

[0005] The present invention aims to provide an ultra-thin brushless flat vibration motor to solve the problems mentioned in the background art. The ultra-thin brushless flat vibration motor provided by the present invention has the characteristics of being able to reduce the size of the motor and also achieve automatic resetting of the motor.

[0006] Another object of the present invention is to provide a method for realizing an ultra-thin brushless flat vibration motor.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: an ultra-thin brushless flat vibration motor, comprising a lower bracket, a stator assembly being provided above the lower bracket, a core shaft being provided on the lower bracket, a rotor assembly being provided on the core shaft, a housing being provided at the upper end of the core shaft and being sleeved on the outside of the rotor assembly, the lower bracket being a magnetic conductive component, the rotor assembly comprising a magnet, and the lower bracket being provided with a plurality of hollow slots corresponding to the magnetic poles of the magnet.

[0008] In order to eliminate the need for a bracket or other structure to secure the magnet and the weight, the motor structure is simplified, reducing production costs while further reducing the size of the motor. Furthermore, the magnet is an annular structure and is connected to the core shaft via a bearing.

[0009] In order to support the rotation of the magnetic steel, further, the bearing is a stepped oil-containing bearing, and the bearing and the magnetic steel are connected by an interference fit.

[0010] In order to generate centrifugal force and make the motor vibrate when the rotor assembly rotates, the rotor assembly further includes a weight, which is bonded to the side of the magnet close to the casing by laser welding or glue.

[0011] In order to facilitate direct assembly with the magnetic steel and effectively increase the weight of the heavy hammer to ensure effective vibration, the heavy hammer is further a semicircular stepped structure less than or equal to 180 degrees.

[0012] In order to ensure a gap between the rotor assembly and the casing, further, the side of the bearing close to the casing is higher than the side of the weight close to the casing.

[0013] In order to form an electric field when power is supplied, the stator assembly further includes an FPC board, which is arranged on the upper surface of the lower bracket and has two symmetrical coils arranged on the FPC board.

[0014] In order to ensure the gap between the rotor assembly and the stator assembly, a gasket is further provided on the circumference of the core shaft, and the gasket is located between the bearing and the lower bracket.

[0015] Furthermore, in the present invention, the method for realizing an ultra-thin brushless flat vibration motor comprises the following steps:

[0016] (1) A plurality of hollow slots corresponding to the magnetic poles of the magnetic steel are provided on the lower bracket of the magnetic conductive material;

[0017] (2) The FPC board is bonded to the upper surface of the lower bracket and forms a circuit with the coil arranged above it, forming an electric field when power is applied;

[0018] (3) The core shaft is connected to the lower bracket by an interference fit to support the rotor assembly and the casing;

[0019] (4) The magnet is mounted on the core shaft through the bearing sleeve. The magnet provides a driving magnetic field for the motor. The magnetic field interacts with the electric field to drive the rotor assembly to rotate;

[0020] (5) The weight is set on the magnet and forms a rotor assembly with the magnet. When the rotor assembly rotates, the weight generates centrifugal force, causing the motor to vibrate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention provides a plurality of hollow slots corresponding to the magnetic poles of the magnet on the lower bracket of the magnetic conductive material. This structure realizes the automatic reset of the motor and can effectively reduce the thickness of the lower bracket, thereby reducing the volume of the motor.

[0023] 2. The present invention directly uses magnetic steel as the fixed body of the rotor assembly, which is assembled on the core shaft through bearings. There is no need to use a bracket or other structure to fix the magnetic steel and the weight, which makes the motor structure simpler, reduces production costs, and further reduces the size of the motor.

[0024] 3. The weight of the present invention is a semicircular stepped structure less than or equal to 180 degrees, which is convenient for direct assembly with the magnetic steel and can effectively increase the weight of the weight, thereby ensuring effective vibration.

[0025] 4. The side of the bearing close to the housing of the present invention is higher than the side of the weight close to the housing, ensuring the gap between the rotor assembly and the housing when the motor is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the rotor assembly of the present invention;

[0028] Figure 3 Schematic diagram of the structure of the stator assembly of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the lower bracket of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the weight hammer of the present invention;

[0031] Figure 6 Schematic diagram of the structure of the bearing of the present invention;

[0032] Figure 7 Schematic diagram of magnetization of the magnetic steel of the present invention.

[0033] In the figure: 1. Housing; 2. Bearing; 3. Core shaft; 4. Weight; 5. Coil; 6. Gasket; 7. Lower bracket; 71. Hollow slot; 8. FPC board; 9. Magnet; 10. Capacitor; 11. Control IC. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-7The present invention provides the following technical solution: an ultra-thin brushless flat vibration motor, comprising a lower bracket 7, a stator assembly is provided above the lower bracket 7, a core shaft 3 is provided on the lower bracket 7, a rotor assembly is provided on the core shaft 3, a housing 1 is provided on the upper end of the core shaft 3 and is sleeved on the outside of the rotor assembly, the lower bracket 7 is a magnetic conductive component, preferably made of low carbon steel, the rotor assembly includes a magnet 9, a plurality of hollow slots 71 corresponding to the magnetic poles of the magnet 9 are provided on the lower bracket 7, and the lower bracket 7 is formed by stamping.

[0037] By adopting the above technical solution, a plurality of hollow slots 71 corresponding to the magnetic poles of the magnet 9 are formed in the lower bracket 7 of the magnetic conductive material. The attractive force of the magnet 9 on the magnetic conductive material causes the rotor assembly to stop in a fixed position when the motor stops, achieving self-reset of the motor and thus ensuring normal startup and operation of the motor. The present invention provides a plurality of hollow slots 71 corresponding to the magnetic poles of the magnet 9 in the lower bracket 7 of the magnetic conductive material. This structure achieves automatic reset of the motor and effectively reduces the thickness of the lower bracket 7, thereby reducing the size of the motor.

[0038] Specifically, the magnetic steel 9 is an annular structure, and the magnetic steel 9 is connected to the core shaft 3 through the bearing 2.

[0039] By adopting the above technical solution, the magnet 9 is directly used as the fixed body of the rotor assembly and assembled on the core shaft 3 through the bearing 2. There is no need to use a bracket or other structure to fix the magnet 9 and the weight 4, which makes the structure of the motor simpler. While reducing the production cost, the volume of the motor is further reduced.

[0040] Specifically, the bearing 2 is a stepped oil-containing bearing, and the bearing 2 and the magnetic steel 9 are connected by an interference fit.

[0041] By adopting the above technical solution, the rotation of the magnetic steel 9 is supported by the bearing 2 .

[0042] Specifically, the rotor assembly further includes a weight 4, which is bonded to the side of the magnet 9 close to the housing 1 by laser welding or glue. In this embodiment, glue bonding is preferred.

[0043] By adopting the above technical solution, when the rotor assembly rotates, the weight 4 generates centrifugal force to cause the motor to vibrate.

[0044] Specifically, the weight 4 is a semicircular stepped structure with an angle less than or equal to 180 degrees.

[0045] By adopting the above technical solution, it is convenient to directly assemble with the magnetic steel 9, and at the same time, the weight of the heavy hammer 4 can be effectively increased, thereby ensuring an effective vibration sense.

[0046] Specifically, the stator assembly includes an FPC board 8 , which is disposed on the upper surface of the lower bracket 7 . Two symmetrical coils 5 are disposed on the FPC board 8 . The FPC board 8 is also provided with a capacitor 10 and a control IC 11 .

[0047] By adopting the above technical solution, the coil 5 and the FPC board 8 form a circuit, and an electric field is generated when power is applied.

[0048] Example 2

[0049] The difference between this embodiment and the first embodiment is that: specifically, the side surface of the bearing 2 close to the housing 1 is higher than the side surface of the weight 4 close to the housing 1 .

[0050] By adopting the above technical solution, the gap between the rotor assembly and the housing 1 is ensured when the motor is working.

[0051] Example 3

[0052] The difference between this embodiment and embodiment 1 is that: specifically, a gasket 6 is further provided on the circumference of the core shaft 3 , and the gasket 6 is located between the bearing 2 and the lower bracket 7 .

[0053] By adopting the above technical solution, the gap between the rotor assembly and the stator assembly is ensured.

[0054] Furthermore, the method for realizing an ultra-thin brushless flat vibration motor according to the present invention comprises the following steps:

[0055] (1) A plurality of hollow slots 71 corresponding to the magnetic poles of the magnetic steel 9 are provided on the lower bracket 7 of the magnetic conductive material;

[0056] (2) The FPC board 8 is bonded to the upper surface of the lower bracket 7 and forms a circuit with the coil 5 arranged above it, forming an electric field when energized;

[0057] (3) The core shaft 3 is connected to the lower bracket 7 by interference fit, and is used to support the rotor assembly and the housing 1;

[0058] (4) The magnet 9 is mounted on the core shaft 3 through the bearing 2. The magnet 9 provides a driving magnetic field for the motor. The magnetic field interacts with the electric field to drive the rotor assembly to rotate;

[0059] (5) The weight 4 is set on the magnet 9 and forms a rotor assembly with the magnet 9. When the rotor assembly rotates, the weight 4 generates centrifugal force to make the motor vibrate.

[0060] To sum up, the present invention opens a number of hollow grooves 71 corresponding to the magnetic poles of the magnet 9 on the lower bracket 7 of the magnetic conductive material. This structure is used to realize the automatic resetting of the motor, which can effectively reduce the thickness of the lower bracket 7 and thus reduce the volume of the motor. The present invention directly adopts the magnet 9 as the fixed body of the rotor assembly, and assembles it on the core shaft 3 through the bearing 2. There is no need to use a bracket or other structure to fix the magnet 9 and the weight 4, so that the structure of the motor is simpler, while reducing the production cost and further reducing the volume of the motor. The weight 4 of the present invention is a semicircular stepped structure less than or equal to 180 degrees, which is convenient for direct assembly with the magnet 9 and can also effectively increase the weight of the weight 4, thereby ensuring effective vibration. The side of the bearing 2 of the present invention close to the casing 1 is higher than the side of the weight 4 close to the casing 1, thereby ensuring the gap between the rotor assembly and the casing 1 when the motor is working.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-thin brushless flat vibration motor, comprising a lower bracket, characterized in that: A stator assembly is provided above the lower bracket, a core shaft is provided on the lower bracket, a rotor assembly is provided on the core shaft, a housing is provided on the upper end of the core shaft and is sleeved on the outside of the rotor assembly, the lower bracket is a magnetic conductive component, the rotor assembly includes a magnet, and the lower bracket is provided with a plurality of hollow slots corresponding to the magnetic poles of the magnet; The magnet is connected to the core shaft through a bearing. The bearing is a stepped oil-containing bearing, and the bearing and the magnet are connected through an interference fit. The rotor assembly also includes a weight, which is laser welded or glued to the side of the magnet close to the casing. The magnet is directly used as the fixed body of the rotor assembly and is assembled on the core shaft through the bearing. There is no need to use a bracket structure to fix the magnet and the hammer. The side of the bearing close to the casing is higher than the side of the hammer close to the casing, ensuring the gap between the rotor assembly and the casing when the motor is working.

2. The ultra-thin brushless flat vibration motor according to claim 1, characterized in that: The magnetic steel is a ring structure.

3. The ultra-thin brushless flat vibration motor according to claim 1, characterized in that: The weight is a semicircular stepped structure with an angle of less than or equal to 180 degrees.

4. The ultra-thin brushless flat vibration motor according to claim 1, characterized in that: The side surface of the bearing close to the housing is higher than the side surface of the weight close to the housing.

5. The ultra-thin brushless flat vibration motor according to claim 1, characterized in that: The stator assembly includes an FPC board, which is arranged on the upper surface of the lower bracket and has two symmetrical coils arranged on the FPC board.

6. The ultra-thin brushless flat vibration motor according to claim 1, characterized in that: A gasket is also provided on the circumference of the core shaft, and the gasket is located between the bearing and the lower bracket.

7. The method for realizing an ultra-thin brushless flat vibration motor according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) A plurality of hollow slots corresponding to the magnetic poles of the magnetic steel are provided on the lower bracket of the magnetic conductive material; (2) The FPC board is bonded to the upper surface of the lower bracket and forms a circuit with the coil arranged above it, forming an electric field when power is applied; (3) The core shaft is connected to the lower bracket by interference fit and is used to support the rotor assembly and the casing; (4) The magnet is mounted on the core shaft through the bearing sleeve. The magnet provides the driving magnetic field for the motor. The magnetic field interacts with the electric field to drive the rotor assembly to rotate; (5) The weight is set on the magnet and forms a rotor assembly with the magnet. When the rotor assembly rotates, the weight generates centrifugal force, causing the motor to vibrate.

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