A miniature direct-current brushless motor

Abstract

The utility model relates to a kind of miniature direct-current brushless motor, including shell, and shell is equipped with accommodating cabin;With the motor rear cover and motor front cover of accommodating cabin seal connection;Stator core is equipped in accommodating cabin;With the rotor assembly matched with stator core;PCBA board is equipped in accommodating cabin;Motor rear cover is equipped with electric connection interface, electric connection interface is operatively electrically connected to PCBA board;The center of motor rear cover is equipped with the stator support shaft extending into accommodating cabin, stator core is fixedly sleeved on stator support shaft;Motor front cover is equipped with insert sealing joint part, insert sealing joint part is used to insert into gear box and form sealed connection with gear box;The output end of the motor shaft of rotor assembly extends outward through insert sealing joint part.It replaces traditional motor.The miniature direct-current brushless motor can effectively solve the problems in the prior art through innovative structural design, improve the performance, reliability and service life of motor in smart home device.

Description

Technical Field

[0001] This utility model belongs to the field of micro motor design technology, and in particular relates to a micro brushless DC motor. Background Technology

[0002] With the rapid rise of the smart home market, various smart devices are increasingly integrating into people's daily lives, bringing unprecedented convenience and comfort. As a typical representative of the smart home field, the smart toilet's automated lid-opening function greatly enhances the user experience. In the smart toilet lid-opening system, the electric motor plays a crucial role, converting electrical energy into mechanical energy to drive the lid's opening and closing action.

[0003] However, the motors used in smart home devices such as smart toilet lids in the present technology are usually installed in the housing by means of flange connection. This traditional design has many significant technical defects in terms of sealing, installation and transmission, which seriously affect the performance, reliability and service life of the device.

[0004] Sealing Performance Defects: Smart toilets are typically used in humid environments, and frequent flushing creates extremely high humidity. This necessitates excellent sealing performance from the motor to prevent moisture, dust, and other impurities from entering and damaging internal components. However, existing motors use flange connections, which leave gaps at the connection points that are difficult to completely eliminate. Although gaskets and other sealing components are used to enhance the seal, they can lose elasticity due to aging and wear over time, leading to a decline in sealing performance. Once moisture enters the motor, it can corrode critical components such as the stator core, rotor assembly, and control circuit board, causing short circuits, reduced insulation, and ultimately affecting the motor's normal operation and shortening its lifespan. For example, in humid areas or in frequently used smart toilets, motor malfunctions due to poor sealing are common, causing inconvenience to users.

[0005] The installation process is cumbersome: flange connections require machining corresponding flanges on both the motor and the housing, then securing them with multiple bolts. This not only increases the cost of component manufacturing and assembly steps, but also demands precise alignment during installation to ensure the parallelism and coaxiality of the flanges. Inaccurate alignment can lead to a weak connection, affecting the motor's transmission accuracy and stability. Furthermore, repairing or replacing the motor requires disassembling multiple bolts, complicating operations and increasing maintenance costs and time. On smart toilet production lines, flange-connected motors have low installation efficiency, prolonging production cycles and hindering efforts to improve production efficiency and reduce costs.

[0006] In view of the aforementioned technical defects in the sealing and installation of existing electric motors, this utility model aims to provide a novel miniature brushless DC motor to replace traditional electric motors. This miniature brushless DC motor, through its innovative structural design, effectively solves the problems in existing technologies, improves the performance, reliability, and lifespan of the motor in smart home devices, and provides users with a superior user experience. Utility Model Content

[0007] To address the problems existing in the prior art, this utility model provides a miniature brushless DC motor.

[0008] This utility model is implemented as follows: a miniature brushless DC motor includes: a housing with a housing compartment inside; a rear cover and a front cover of the motor sealed to the housing compartment; a stator core disposed within the housing compartment; a rotor assembly cooperating with the stator core; and a PCBA board disposed within the housing compartment. The rear cover is characterized by having an electrical connection interface operably connected to the PCBA board; a stator support shaft extending into the housing compartment is located at the center of the rear cover, and the stator core is fixedly sleeved on the stator support shaft; the front cover has an insert sealing joint for inserting into a gearbox and forming a sealed connection with the gearbox; and the output end of the motor shaft of the rotor assembly extends outward through the insert sealing joint.

[0009] More preferably, the stator support shaft is a solid shaft or a hollow shaft.

[0010] In a further preferred embodiment, the end of the motor shaft furthest from the output end is inserted into the stator support shaft, and the two are rotatably connected.

[0011] More preferably, the motor shaft is rotatably supported by at least one of a first support bearing and a second support bearing; the first support bearing is located inside the stator support shaft, and the second support bearing is located inside the insert sealing joint.

[0012] More preferably, the rotor assembly includes a rotor support, which includes: a rotor sleeve fixedly connected to the motor shaft; a rotor web extending radially along the rotor sleeve; a rotor outer ring disposed on the outer edge of the rotor web; and an annular permanent magnet disposed on the inner peripheral wall of the rotor outer ring.

[0013] In a further preferred embodiment, the rotor web is provided with a positioning groove, and the permanent magnet is provided with a positioning protrusion that matches the positioning groove, with the positioning protrusion embedded in the positioning groove to form a positioning fit.

[0014] A further preferred embodiment has 3 to 16 stator slots in the stator core.

[0015] More preferably, the rotor assembly is an inner rotor assembly, including an annular permanent magnet mounted on the motor shaft, the annular permanent magnet being located inside the stator core.

[0016] A further preferred embodiment has a positioning stop on the circumferential outer side of the insert sealing joint.

[0017] More preferably, the axial end face of the insert sealing joint is provided with a relief groove in the central region, the relief groove being used to accommodate the axial extension of the gearbox output gear.

[0018] The advantages and technical effects of this utility model are as follows: The miniature brushless DC motor of this utility model has the following overall technical effects:

[0019] Excellent sealing: The front cover of the motor is sealed to the housing, and the front cover of the motor is provided with a plug-in sealing joint, which can be plugged into the gearbox to form a sealed connection. This can effectively prevent external moisture, dust and other impurities from entering the motor, protect key components such as the stator core, rotor assembly and PCBA board, reduce the risk of motor failure caused by environmental factors, and improve the reliability and service life of the motor in harsh environments such as humid and dusty conditions.

[0020] Easy and efficient installation: The gearbox is connected by a cartridge-type sealing joint. Compared with the traditional flange connection, there is no need to process flanges on the motor and gearbox or perform multiple bolt tightening operations. This simplifies the installation process, reduces the cost of parts processing and assembly procedures, and improves installation efficiency. It also facilitates subsequent maintenance and replacement work, reducing maintenance costs and time.

[0021] Improved transmission stability: The sealed connection between the insert-sealed joint and the gearbox enhances the connection rigidity between the motor and the gearbox, reduces vibration and wobbling of the motor shaft during transmission, reduces friction and wear between transmission components, improves transmission efficiency, and ensures that the output end of the motor shaft can transmit power stably and accurately, meeting the requirements of intelligent devices (such as intelligent toilet lids) for transmission accuracy and stability, and improving the user experience.

[0022] Compact and reasonable structure: The center of the motor rear cover has a stator support shaft extending into the housing, and the stator core is fixedly sleeved on it. This design optimizes the internal structural layout of the motor, making the overall structure of the motor more compact. It is conducive to achieving efficient operation of the motor in a limited space, and is especially suitable for smart home devices with strict space requirements.

[0023] Convenient and reliable electrical connection: The motor rear cover is equipped with an electrical connection interface, which can be electrically connected to the PCBA board, making it convenient for the motor to connect with external circuits, ensuring stable transmission of electrical signals, and ensuring that the motor can operate normally according to the preset control logic. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0025] Figure 2 yes Figure 1 3D sectional view of the middle AA section;

[0026] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 4 and Figure 5 This is a schematic diagram of the rotor frame structure;

[0028] Figure 6 This is a schematic diagram of a ring-shaped permanent magnet structure;

[0029] Figure 7 This is a usage diagram of Example 1 applied to the flip cover driver;

[0030] Figure 8 This is a schematic diagram of the installation structure of the flip cover driver and gearbox in Example 1;

[0031] Figure 9 This is a schematic diagram of the internal rotor structure in Embodiment 2 of this utility model;

[0032] Figure 10 This is a schematic diagram of a plug-in type electrical connection interface;

[0033] Figure 11 This is a schematic diagram of the connector integrated into the PCBA board structure.

[0034] In the diagram: 100, housing; 101, accommodating compartment; 200, motor rear cover; 201, electrical connection interface; 300, motor front cover; 301, insert sealing joint; 301a, positioning stop; 301b, clearance groove; 400, stator core; 500, rotor assembly; 501, motor shaft; 502, rotor support; 502a, rotor sleeve; 502b, rotor web; 502c, rotor outer ring; 502d, positioning groove; 503, annular permanent magnet; 503a, positioning protrusion; 600, PCBA board; 700, stator support shaft; 800, gearbox; 901, first support bearing; 902, second support bearing; Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0036] Example 1, please refer to Figures 1 to 8A miniature brushless DC motor includes: a housing 100, within which a receiving compartment 101 is provided; a rear cover 200 and a front cover 300 of the motor, which are sealed and connected to the receiving compartment 101; the connection method can be integral molding, laser welding, ultrasonic welding, or adhesive sealing; and a stator core 400 disposed within the receiving compartment 101, the stator core 400 having 3 to 16 stator slots, which can be selected according to different power, speed, and other requirements, flexibly adjusting the motor performance parameters to meet the needs of smart homes and other applications. The application scenarios demand diverse motor performance; a rotor assembly 500 that mates with the stator core 400; a PCBA board 600 housed within the accommodating compartment 101; an electrical connection interface 201 provided on the motor rear cover 200, which is operably electrically connected to the PCBA board 600; the electrical connection interface 201 can be integrally formed on the motor rear cover; or a wire hole can be provided on the motor rear cover, and a wire harness can be connected to the PCBA, along with an external plug at the other end of the wire harness; or an integrated socket can be provided on the motor rear cover. Figure 10 Connectors (such as terminal blocks) integrated into the PCBA board using or mating sockets. Figure 11 .

[0037] The motor rear cover 200 has a stator support shaft 700 extending into the accommodating compartment 101 at its center, and the stator core 400 is fixedly sleeved on the stator support shaft 700; the motor front cover 300 can be integrally formed with the housing, or it can be sealed and connected by adhesive or hot melt welding; the motor front cover 300 has an insert sealing joint 301, which is used to insert into the gearbox 800 and form a sealed connection with the gearbox 800; the output end of the motor shaft 501 of the rotor assembly 500 extends outward through the insert sealing joint 301.

[0038] Working Principle: An external power supply establishes an electrical connection with the PCBA board through the electrical connection interface on the motor's rear cover. The PCBA board controls and processes the input electrical energy, generating appropriate current and voltage signals. The stator core is fixed on the stator support shaft and generates a magnetic field when energized. Under the influence of the magnetic field generated by the stator core, the rotor assembly's motor shaft receives driving force and begins to rotate. The output end of the motor shaft extends outward through the insert-sealed joint of the motor's front cover, transmitting power to connected components such as the gearbox, thus achieving power output. The aforementioned insert-sealed joint ensures a seal, preventing dust and water damage; the structure is simplified for convenient installation; the motor shaft provides stable power output and precise transmission; the electrical connection interface ensures stable signal transmission, guaranteeing efficient and stable motor operation.

[0039] More preferably, the stator support shaft 700 is a solid shaft or a hollow shaft. A solid shaft has a simple structure, high strength, and can withstand a large torque, making it suitable for scenarios with high requirements for motor output torque; a hollow shaft can reduce weight and rotational inertia, which is beneficial for the motor's rapid response and energy saving, and also facilitates internal wiring and other operations, meeting different design requirements and improving the motor's applicability.

[0040] More preferably, the end of the motor shaft 501 furthest from the output end is inserted into the stator support shaft 700, and the two are rotatably connected. This design enhances the support stability of the motor shaft, reduces vibration and sway during operation, improves transmission accuracy and reliability, optimizes the internal structural layout of the motor, makes the motor run more smoothly, extends the service life of the motor, and improves overall performance.

[0041] More preferably, the motor shaft 501 is rotatably supported by at least one of a first support bearing 901 and a second support bearing 902; the first support bearing 901 is disposed within the stator support shaft 700, and the second support bearing 902 is disposed within the insert sealing joint 301. The placement of the first support bearing within the stator support shaft and the second support bearing within the insert sealing joint allows for multi-position support of the motor shaft, effectively distributing the stress on the motor shaft, reducing wear, improving the smoothness of motor shaft rotation, and ensuring efficient and stable motor operation.

[0042] In this embodiment, the rotor assembly 500 is an outer rotor assembly, including a rotor support 502. The rotor support 502 includes: a rotor sleeve 502a fixedly connected to the motor shaft 501; a rotor web 502b extending radially along the rotor sleeve 502a; and a rotor outer ring 502c disposed on the outer edge of the rotor web 502b. An annular permanent magnet 503 is provided on the inner peripheral wall of the rotor outer ring 502c. This generates a stable magnetic field, which, in conjunction with the stator core, achieves efficient electromagnetic conversion, improving the motor's output performance and efficiency.

[0043] More preferably, the rotor web 502b is provided with a positioning groove 502d, and the permanent magnet 503 is provided with a positioning protrusion 503a that matches the positioning groove 502d. The positioning protrusion 503a is embedded in the positioning groove 502d to form a positioning fit. The positioning protrusion embedded in the positioning groove to form a positioning fit can accurately fix the position of the permanent magnet, prevent it from shifting during operation, ensure a stable magnetic field distribution, improve the stability and reliability of motor operation, and reduce the risk of performance degradation caused by permanent magnet displacement.

[0044] More preferably, the outer diameter of the housing 100 is 20-30 mm. In this embodiment, 24 mm is preferred, and it can be selected according to different power, speed and other requirements, so as to flexibly adjust the motor performance parameters and meet the diverse needs of motor performance in different application scenarios such as smart homes.

[0045] More preferably, the circumferential outer side of the insert sealing joint 301 is provided with a positioning stop 301a. The positioning stop can play a precise positioning role when the insert sealing joint is connected to the gearbox, ensuring that the connection position of the two is accurate, improving the connection accuracy and stability, ensuring the transmission accuracy between the motor and the gearbox, and improving the overall transmission effect.

[0046] More preferably, the axial end face of the insert sealing joint 301 is provided with a relief groove 301b, which is used to accommodate the axial extension of the gearbox output gear. The inner diameter of the relief groove is larger than the outer diameter of the output gear. This can prevent the motor and gearbox from being misaligned during installation and from interfering during operation, ensuring the concentric fit between the motor shaft and the gearbox output gear, and improving transmission efficiency and reliability.

[0047] Example 2, please refer to Figure 9 In this embodiment, the rotor assembly 500 is an inner rotor assembly, including an annular permanent magnet 503 mounted on the motor shaft. The annular permanent magnet 503 is located inside the stator core and drives the motor shaft to rotate after being energized.

[0048] In summary, this miniature brushless DC motor demonstrates significant overall technical advantages. Regarding sealing, the motor's front cover is sealed to the housing and gearbox, effectively preventing the ingress of external moisture, dust, and other impurities, protecting the internal stator core, rotor assembly, and PCBA board, and improving the motor's reliability and lifespan in harsh environments. For installation, the insert-type sealed joint design simplifies the installation process, reduces component processing and assembly steps, and facilitates maintenance and replacement. In terms of transmission, excellent sealing and structural optimization reduce motor shaft vibration and wear, ensuring transmission accuracy and stability, meeting the high transmission requirements of smart home devices, and enhancing the user experience. Furthermore, the electrical connection interface facilitates connection to external circuits, ensuring stable motor operation.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A miniature brushless DC motor, comprising: A housing (100) having a accommodating compartment (101) inside; The motor rear cover (200) and the motor front cover (300) are sealed and connected to the accommodating compartment (101); The stator core (400) is disposed within the accommodating compartment (101); A rotor assembly (500) that mates with the stator core (400); PCBA board (600) disposed within the accommodating compartment (101); The feature is that: the motor rear cover (200) is provided with an electrical connection interface (201), and the electrical connection interface (201) is operably electrically connected to the PCBA board (600); The motor rear cover (200) has a stator support shaft (700) extending into the accommodating compartment (101) at its center, and the stator core (400) is fixedly sleeved on the stator support shaft (700); The motor front cover (300) is provided with an insert sealing joint (301), which is used to insert into the gearbox (800) and form a sealed connection with the gearbox (800); The output end of the motor shaft (501) of the rotor assembly (500) extends outward through the insert sealing joint (301).

2. The miniature brushless DC motor according to claim 1, characterized in that: The stator support shaft (700) is a solid shaft or a hollow shaft.

3. The miniature brushless DC motor according to claim 1, characterized in that: The end of the motor shaft (501) away from the output end is inserted into the stator support shaft (700), and the two are rotatably connected.

4. The miniature brushless DC motor according to claim 3, characterized in that: The motor shaft (501) is rotatably supported by at least one of the first support bearing (901) and the second support bearing (902); The first support bearing (901) is disposed inside the stator support shaft (700), and the second support bearing (902) is disposed inside the insert sealing joint (301).

5. The miniature brushless DC motor according to claim 1, characterized in that: The rotor assembly (500) is an outer rotor assembly, including a rotor support (502), the rotor support (502) including: a rotor sleeve (502a) fixedly connected to the motor shaft (501); Rotor web (502b) extending radially along the rotor sleeve (502a); The rotor outer ring (502c) is located on the outer edge of the rotor web (502b); The inner circumferential wall of the outer ring (502c) of the rotor is provided with an annular permanent magnet (503).

6. The miniature brushless DC motor according to claim 5, characterized in that: The rotor web (502b) is provided with a positioning groove (502d), and the permanent magnet (503) is provided with a positioning protrusion (503a) that matches the positioning groove (502d). The positioning protrusion (503a) is embedded in the positioning groove (502d) to form a positioning fit.

7. The miniature brushless DC motor according to claim 1, characterized in that: The stator core (400) has 3 to 16 stator slots.

8. The miniature brushless DC motor according to claim 1, characterized in that: The rotor assembly (500) is an inner rotor assembly, including an annular permanent magnet (503) mounted on the motor shaft, the annular permanent magnet (503) being located inside the stator core.

9. The miniature brushless DC motor according to claim 1, characterized in that: The outer circumferential side of the insert sealing joint (301) is provided with a positioning stop (301a).

10. The miniature brushless DC motor according to claim 1, characterized in that: The axial end face of the insert sealing joint (301) is provided with a relief groove (301b), which is used to accommodate the axial extension of the gearbox output gear.

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