A motor structure, a brushless motor and a ground brush assembly

Abstract

The utility model belongs to brushless motor related technical field, especially related to a motor structure, brushless motor and ground brush subassembly. Through setting stator subassembly, be provided with stator base and winding, stator base includes base, the first plane middle part of base is provided with extension in the direction of far away from base, extension and base inside are provided with rotation passageway, winding sets up on extension, and rotor subassembly, be provided with the shaft and magnetite, the shaft sets up in rotation passageway, magnetite sets up in winding outside, the shaft is provided with connecting portion to connect magnetite and drive magnetite rotation, wherein, the first plane is provided with circuit board subassembly between winding, is provided with Hall piece on circuit board subassembly to detect the Hall signal of magnetite rotation. Will set up Hall piece between base and winding, thereby will set up Hall piece in the inside of motor, thereby avoid the use of magnetic ring also reduce the occupation of additional space of Hall piece.

Description

Technical Field

[0001] The core principle of a brushless motor is to replace mechanical commutation with electronic commutation. A controller precisely controls the energizing sequence of the stator windings based on the rotor position, using electromagnetic force to drive the rotor to rotate continuously, thus efficiently converting electrical energy into mechanical energy. To achieve rotation control, sensors are needed to determine the brushless motor's rotation angle and speed. These sensors primarily include Hall effect sensors, which detect the rotation angle and speed by sensing Hall signals.

[0002] In existing technologies, the housing of a brushless motor typically encloses the windings to form a sealed space, allowing the rotor and stator to interact within this space and providing protection. The Hall effect sensors and circuit boards are usually located outside this sealed space, interacting with the Hall effect sensors via a magnetic ring on the shaft to sense Hall signals. However, this structure not only requires an additional magnetic ring, increasing the motor's cost, but also necessitates additional external space for the Hall effect sensors. Furthermore, the magnetic ring and existing Hall effect sensors cannot control the brushless motor to achieve rapid forward and reverse rotation and start / stop. Background Technology

[0003] This utility model belongs to the technical field of brushless motors, and in particular relates to a motor structure, a brushless motor, and a floor brush assembly. Utility Model Content

[0004] To address the technical problem that "existing brushless motor structures require additional magnetic rings, increasing motor cost; the magnetic rings and Hall effect sensors occupy extra space; and the magnetic rings and existing Hall effect sensors cannot control the brushless motor to achieve rapid forward and reverse rotation and start / stop," this utility model proposes a motor structure, a brushless motor, and a floor brush assembly.

[0005] This utility model solves the above problems through the following technical means: In a first aspect, this utility model proposes a motor structure, comprising: A stator assembly is provided with a stator base and a winding. The stator base includes a base, and an extension is provided in the middle of the first plane of the base in a direction away from the base. A rotation channel is provided between the extension and the base. The winding is disposed on the extension. The rotor assembly is provided with a rotating shaft and a magnet. The rotating shaft is located inside the rotation channel, and the magnet is located outside the winding. The rotating shaft is provided with a connecting part to connect to the magnet and drive the magnet to rotate. A circuit board assembly is provided between the first plane and the winding, and a Hall element is provided on the circuit board assembly to detect the Hall signal generated by the rotation of the magnet.

[0006] The stator assembly includes a stator base and windings. The stator base has an extension extending from the center of its first plane away from the base, with a rotation channel between the extension and the base. The windings are mounted on the extension. The rotor assembly includes a shaft and a magnet. The shaft is located within the rotation channel, and the magnet is located outside the windings. The shaft has a connecting part to connect to and rotate the magnet. A circuit board assembly with Hall effect sensors is positioned between the first plane and the windings to detect the Hall signals generated by the magnet's rotation. By placing the Hall effect sensors between the base and the windings, the motor is internally located, eliminating the need for a magnetic ring and reducing the space occupied by the sensors. Furthermore, by eliminating the magnetic ring and allowing the Hall effect sensors to directly sense the magnets, the brushless motor's rapid forward and reverse rotation and start / stop capabilities are improved.

[0007] In some embodiments, the circuit board assembly is provided with a second plane, which is disposed away from the first plane, and the Hall element is disposed on the second plane.

[0008] In some implementations, the distance between the Hall element and the magnet is 0.5 to 2.5 mm.

[0009] In some implementations, the extension is provided with a step, and the circuit board assembly is snapped onto the step.

[0010] In some implementations, the distance between the first plane and the circuit board assembly is 1.0~2.0mm.

[0011] In some implementations, multiple Hall effect sensors are provided, and each Hall effect sensor has a circumferential angle relative to the center of the circuit board assembly, with the circumferential angles being of the same size.

[0012] In some embodiments, a first groove is provided on the base, and a second groove is provided on the circuit board assembly, with the first groove and the second groove aligned.

[0013] In some embodiments, the rotor assembly further includes a housing connected to the connection portion, the housing enclosing the outside of the winding, and a plurality of magnet mounting positions provided inside the housing, with magnets disposed in the magnet mounting positions and adjacent magnets having opposite magnetic properties.

[0014] Secondly, this utility model proposes a brushless motor, including the motor structure as described in any of the first aspects, with a notch provided on the base for external electrical connection of the circuit board assembly, bearings provided on both sides of the rotation channel, and the rotating shaft passing through the bearings for rotation.

[0015] Thirdly, this utility model proposes a floor brush assembly, including a brushless motor as proposed in the second aspect. The floor brush assembly is connected to the circuit board assembly through a wire harness passing through a notch to control the rotation of the brushless motor.

[0016] The beneficial effects of this utility model regarding a motor structure, a brushless motor, and a floor brush assembly are: 1. A stator assembly is provided, comprising a stator base and windings. The stator base includes a base, with an extension extending from the center of the first plane of the base away from the base. A rotation channel is provided between the extension and the base, and the windings are disposed on the extension. A rotor assembly is also provided, comprising a shaft and a magnet. The shaft is disposed within the rotation channel, and the magnet is disposed outside the windings. A connecting portion is provided on the shaft to connect to and drive the magnet to rotate. A circuit board assembly is disposed between the first plane and the windings, and a Hall effect sensor is disposed on the circuit board assembly to detect the Hall signal generated by the magnet's rotation. By placing the Hall effect sensor between the base and the windings, the Hall effect sensor is located inside the motor, thus avoiding the use of a magnetic ring and reducing the additional space occupied by the Hall effect sensor.

[0017] 2. By eliminating the magnetic ring, the Hall element can be directly induced by the magnet, which can improve the brushless motor's ability to quickly rotate forward and backward and start and stop. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the motor structure of this utility model; Figure 2 This is an exploded view of the circuit board and stator base of the motor structure of this utility model; Figure 3 This is a perspective view of the brushless motor of this utility model.

[0019] Figure label: 1. Stator assembly; 11. Stator base; 111. Base; 1111. First plane; 1112. Step; 1113. Notch; 1114. First groove; 112. Extension; 12. Winding; 2. Rotor assembly; 21. Shaft; 22. Magnet; 23. Connecting part; 24. Bearing; 3. Circuit board assembly; 31. Second plane; 32. Second groove; 4. Hall effect sensor; 5. Outer casing; 6. Wiring harness. Detailed implementation method: It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of this utility model can be combined with each other. The detailed description in the specific embodiments should be understood as an explanation of the spirit of this utility model and should not be regarded as an improper limitation of this utility model.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the specific technical solutions of this utility model will be further described in detail below with reference to the accompanying drawings of the embodiments of this utility model. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] In the embodiments of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] Furthermore, in this embodiment of the invention, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0023] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0024] In embodiments of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0025] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant information in a specific manner.

[0026] Example 1: like Figure 1 As shown, this embodiment proposes a motor structure, including: Stator assembly 1 is provided with stator base 11 and winding 12. Stator base 11 includes base 111. An extension 112 is provided in the middle of the first plane 1111 of base 111 in a direction away from base 111. A rotation channel is provided between the extension 112 and the base 111. The winding 12 is disposed on the extension 112. The rotor assembly 2 is provided with a rotating shaft 21 and a magnet 22. The rotating shaft 21 is located inside the rotation channel, and the magnet 22 is located outside the winding 12. The rotating shaft 21 is provided with a connecting part 23 to connect the magnet 22 and drive the magnet 22 to rotate. A circuit board assembly 3 is provided between the first plane 1111 and the winding 12. A Hall element 4 is provided on the circuit board assembly 3 to detect the Hall signal generated by the rotation of the magnet 22.

[0027] Specifically, the stator assembly 1 includes a stator base 11 and a winding 12. The stator base 11 includes a base 111 and a winding 12. The first plane 1111 of the base 111 has an extension 112 extending from the center in a distance to fix the winding 12, so that the winding 12 is fixedly arranged around the extension 112. A rotation channel is provided in the extension 112 and the base 111. The winding 12 is fixed on the extension 112. The rotation channel is used to set the rotating shaft 21 so that the rotating shaft 21 can rotate within the rotation channel. The rotor assembly 2 interacts with the winding 12 through a magnet 22 and drives the rotating shaft 21 to rotate through the magnet 22. The magnet 22 is disposed outside the winding 12 through a connecting part 23. The magnet 22 is typically composed of multiple magnetic tiles, which are spaced apart and connected on the connecting part 23, with the magnetic properties of the spaced magnetic tiles being opposite. A circuit board assembly 3 is provided between the first plane 1111 and the winding 12, including a circuit board, a wire harness 6 and a Hall plate for setting Hall element 4, etc. The Hall element 4 is set on the circuit board assembly 3 so as to sense the magnet 22 at a closer distance.

[0028] The Hall element 4 is positioned between the first plane 1111 and the winding 12. Compared to the traditional placement on the second plane 31 opposite the first plane 1111 of the base 111, its advantage lies in the fact that the Hall element 4 is located inside the brushless motor, eliminating the need for additional space to house it. Furthermore, the Hall element 4 is closer to the magnet 22, allowing it to directly sense Hall signals with the magnet 22, rather than indirectly sensing signals through a magnetic ring on the shaft 21. This method enables faster rotor control. Additionally, this method allows for a larger Hall element 4, resulting in faster motor forward / reverse angle adjustments and quicker start / stop responses. Furthermore, reducing the number of magnetic rings during motor production can decrease the overall production cost of the brushless motor.

[0029] The stator assembly 1 includes a stator base 11 and a winding 12. The stator base 11 includes a base 111, with an extension 112 extending away from the base 111 from the center of the first plane 1111. A rotation channel is provided between the extension 112 and the base 111, and the winding 12 is disposed on the extension 112. The rotor assembly 2 includes a shaft 21 and a magnet 22. The shaft 21 is disposed within the rotation channel, and the magnet 22 is disposed outside the winding 12. A connecting part 23 is provided on the shaft 21 to connect to and drive the magnet 22 to rotate. A circuit board assembly 3 is disposed between the first plane 1111 and the winding 12. A Hall effect sensor 4 is disposed on the circuit board assembly 3 to detect the Hall signal generated by the rotation of the magnet 22. By placing the Hall effect sensor 4 between the base 111 and the winding 12, the Hall effect sensor 4 is placed inside the motor, thus avoiding the use of a magnetic ring and reducing the additional space occupied by the Hall effect sensor 4. Furthermore, by eliminating the magnetic ring, the Hall element 4 can be directly induced by the magnet 22, which can improve the brushless motor's ability to quickly reverse direction and start and stop.

[0030] Example 2: Please refer to the following: Figure 1 ~as Figure 3 As shown, this embodiment further explains and optimizes the structure proposed in Embodiment 1: In some embodiments, the circuit board assembly 3 is provided with a second plane 31, which is disposed away from the first plane 1111, and the Hall element 4 is disposed on the second plane 31.

[0031] Specifically, the circuit board assembly 3 is provided with a second plane 31, which is far away from the first plane 1111, so that the Hall element 4 is located on the second plane 31, thereby allowing the Hall element 4 to be located closer to the magnet 22, and thus more sensitive and faster when sensing Hall signals, so as to make the forward and reverse rotation angle and start and stop response faster when controlling the brushless motor.

[0032] In some embodiments, the distance between the Hall element 4 and the magnet 22 is 0.5~2.5mm.

[0033] Specifically, the position of the Hall element 4 and the magnet 22 should be maintained at least 0.5~2.5mm. Exceeding or falling below this range will result in poor sensing effect of the Hall element 4 when sensing the magnet 22.

[0034] In some embodiments, the extension 112 is provided with a step 1112, and the circuit board assembly 3 is snapped onto the step 1112.

[0035] Specifically, the extension 112 is provided with a step 1112, and the circuit board assembly 3 is provided with a through hole for fitting onto the extension 112. The circuit board is limited on the step 1112 by the step 1112 to control the height of the circuit board assembly 3 and the first plane 1111, thereby controlling the distance between the Hall element 4 and the magnet 22.

[0036] In some embodiments, the distance between the first plane 1111 and the circuit board assembly 3 is 1.0~2.0mm.

[0037] Specifically, the distance between the first plane 1111 and the circuit board assembly 3 is 1.0~2.0mm. Too high or too low a height will result in poor performance of the Hall element 4 when acquiring Hall signals. In addition, if the circuit board assembly 3 is too high, the Hall element 4 will be too high and the signal will be blocked by the winding 12.

[0038] In some embodiments, multiple Hall effect sensors 4 are provided, and each Hall effect sensor 4 has a circumferential angle relative to the center of the circuit board assembly 3, and the circumferential angles are of the same size.

[0039] Specifically, there are multiple Hall effect elements 4, more specifically three. The circuit board assembly 3 is close to a circle, and the Hall effect elements 4 have the same circumferential angle. When there are three Hall effect elements 4, the circumferential angle is 120°.

[0040] In some embodiments, a first groove 1114 is provided on the base 111, and a second groove 32 is provided on the second circuit board assembly 3, with the first groove 1114 and the second groove 32 being aligned.

[0041] Specifically, the base 111 is provided with a first groove 1114, and the circuit board assembly 3 is provided with a second groove 32 for matching the first groove 1114. The first groove 1114 and the second groove 32 can be aligned so that when the circuit board assembly 3 is installed to the extension 112, the circuit board assembly 3 can be rotated to align with the first groove 1114 and the second groove 32 to ensure the angle at which the Hall element 4 is installed on the brushless motor.

[0042] In some embodiments, the rotor assembly 2 further includes a housing 5, which is connected to the connecting portion 23. The housing 5 is disposed around the outside of the winding 12. A plurality of magnet 22 mounting positions are provided inside the housing 5. The magnets 22 are disposed in the magnet 22 mounting positions, and the magnets of adjacent magnets 22 have opposite magnetic properties.

[0043] Specifically, the rotor assembly 2 also includes a housing 5, which is connected to the connecting portion 23 or can be integrally formed with the connecting portion 23. During installation, the housing 5 and the connecting portion 23 form a shell that wraps around the outside of the winding 12. The housing 5 is positioned outside the winding 12, creating a sealed space within the housing 5 and the connecting portion 23. The Hall element 4 is positioned between the first plane 1111 and the winding 12. When the housing 5 and the connecting portion 23 are installed, the Hall element 4 can be positioned within the sealed space, thus avoiding the need for additional space to store the Hall element 4. Example 3: like Figure 3 As shown, this embodiment proposes a brushless motor, including the motor structure proposed in either embodiment 1 or embodiment 2. A notch 1113 is provided on the base 111, and the notch 1113 is used for external electrical connection of the circuit board assembly 3. Bearings 24 are provided on both sides of the rotation channel, and the rotating shaft 21 rotates through the bearings 24.

[0044] Specifically, the base 111 is provided with a notch 1113, which allows the wire harness 6 to be directly connected to the circuit board assembly 3 through the notch 1113. This allows the wire harness 6 to obtain the Hall signal of the Hall element 4 of the circuit board assembly 3, and to supply power to the winding 12 through the wire harness 6 according to the Hall signal, so as to achieve the effect of rapid forward and reverse rotation or start and stop.

[0045] Example 4: This embodiment proposes a floor brush assembly, including a brushless motor as proposed in embodiment 3. The floor brush assembly is connected to the circuit board assembly 3 through the wire harness 6 passing through the notch 1113 to control the rotation of the brushless motor.

[0046] Specifically, by using a brushless motor with the structure of Embodiment 3, and employing the results of Embodiments 1 and 2, the brush assembly can fulfill the sweeping and vibration function. The motor's forward and reverse rotation angles and start-stop response are fast, thereby improving the sweeper's ability to sweep and vibrate to clean stubborn garbage. This solves the problem that existing conventional brushless external rotation sweepers can only meet unidirectional operation and cannot perform forward and reverse sweeping and vibration.

[0047] The serial numbers of the utility model embodiments are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are only preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.

Claims

1. A motor structure, characterized in that, include: A stator assembly (1) is provided with a stator base (11) and a winding (12). The stator base (11) includes a base (111). An extension (112) is provided at the center of a first plane (1111) of the base (111) in a direction away from the base (111). A rotation channel is provided between the extension (112) and the base (111). The winding (12) is disposed on the extension (112). The rotor assembly (2) is provided with a rotating shaft (21) and a magnet (22). The rotating shaft (21) is located in the rotating channel, and the magnet (22) is located outside the winding (12). The rotating shaft (21) is provided with a connecting part (23) to connect the magnet (22) and drive the magnet (22) to rotate. A circuit board assembly (3) is provided between the first plane (1111) and the winding (12), and a Hall element (4) is provided on the circuit board assembly (3) to detect the Hall signal generated by the rotation of the magnet (22).

2. The motor structure according to claim 1, characterized in that, The circuit board assembly (3) is provided with a second plane (31), which is located away from the first plane (1111), and the Hall element (4) is disposed on the second plane (31).

3. The motor structure according to claim 1, characterized in that, The distance between the Hall element (4) and the magnet (22) is 0.5~2.5mm.

4. The motor structure according to claim 1, characterized in that, The extension (112) is provided with a step (1112), and the circuit board assembly (3) is snapped onto the step (1112).

5. The motor structure according to claim 4, characterized in that, The distance between the first plane (1111) and the circuit board assembly (3) is 1.0~2.0mm.

6. The motor structure according to claim 1, characterized in that, Multiple Hall effect sensors (4) are provided, and each Hall effect sensor (4) has a circumferential angle relative to the center of the circuit board assembly (3), and the circumferential angles are of the same size.

7. The motor structure according to claim 1, characterized in that, The base (111) is provided with a first groove (1114), and the circuit board assembly (3) is provided with a second groove (32). The first groove (1114) and the second groove (32) are aligned.

8. The motor structure according to claim 1, characterized in that, The rotor assembly (2) also includes a housing (5), which is connected to the connecting part (23). The housing (5) is wrapped around the outside of the winding (12). Multiple magnet (22) mounting positions are provided inside the housing (5). The magnets (22) are located in the magnet (22) mounting positions, and the magnets (22) of adjacent magnets (22) have opposite magnetic properties.

9. A brushless motor, characterized in that, The motor structure includes any one of claims 1-8, wherein the base (111) is provided with a notch (1113) for external electrical connection of the circuit board assembly (3), and bearings (24) are provided on both sides of the rotating channel, and the rotating shaft (21) rotates through the bearings (24).

10. A floor brush assembly, characterized in that, Including a brushless motor as described in claim 9, the ground brush assembly is connected to the circuit board assembly (3) via a wire harness (6) passing through the notch (1113) to control the rotation of the brushless motor.

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