Motor and electric tool

Abstract

The utility model relates to the technical field of tools, and discloses a motor and an electric tool. The motor comprises a motor shaft; the rotor assembly is sleeved on the motor shaft; the stator assembly is arranged around the motor shaft, the stator assembly comprises a stator iron core, a stator end plate connected with the stator iron core and a coil wound on the stator end plate, and a plurality of buckling structures are arranged on the side, away from the stator iron core, of the stator end plate in the circumferential direction of the motor shaft; a plurality of first protruding parts are arranged on the side, away from the stator iron core, of the stator end plate in a protruding and extending mode, and the protruding and extending tail end of each first protruding part is provided with the buckling structure used for fixing the circuit board to the stator end plate. According to the motor and the electric tool, manual identification does not need to be carried out for a long time, the installed circuit board is more stable, the production efficiency is guaranteed, and the error rate is reduced.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the tool technical field, in particular to a motor and electric tool. BACKGROUND

[0002] With the continuous development of tool manufacturing technology, the types of electric tools are also constantly enriched. The use of electric tools can improve the operation efficiency of operating personnel, especially in some operation scenes that are not convenient for manual operation. For example, the use of lawn mowers greatly reduces the labor cost. And compared with manual operation, the operation quality can be ensured. Electric tools drive the moving parts through the motor to realize the corresponding processing operation.

[0003] The circuit board is an important component in the motor, which can be used to arrange control circuits and Hall elements and other detection devices. The circuit board in the prior art is fixed by screw locking, which takes a long time. It is necessary to first clamp the circuit board into the screw hole position, and then screw the screw into the screw hole through the screwdriver, which will consume a long assembly time. Therefore, how to design the assembly structure of the circuit board to improve the assembly efficiency of the circuit board is an important problem. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiment of the present application is to provide a motor and electric tool which can improve the assembly accuracy of the circuit board.

[0005] To solve the above technical problems, the embodiment of the present application provides a motor. The motor comprises a motor shaft;

[0006] A rotor assembly is sleeved on the motor shaft;

[0007] A stator assembly is arranged around the motor shaft, the stator assembly comprises a stator core, a stator end plate connected with the stator core, and a coil wound on the stator end plate, and a plurality of buckling structures are arranged on the side of the stator end plate away from the stator core in the circumferential direction of the motor shaft;

[0008] A circuit board, the side of the stator end plate away from the stator core is provided with a plurality of first protruding parts, and the protruding end of each first protruding part is provided with a buckling structure for fixing the circuit board to the stator end plate;

[0009] The side of the stator end plate away from the stator core is also provided with a plurality of second protruding parts, and the plurality of second protruding parts abut against the side of the circuit board away from the motor shaft.

[0010] In some embodiments, the first protruding parts and the second protruding parts are sequentially arranged in the circumferential direction of the motor shaft.

[0011] In some embodiments, the number of the second protrusions is not less than the number of the first protrusions.

[0012] In some embodiments, the second protrusions are three in number and are arranged at equal intervals.

[0013] In some embodiments, the circuit board is provided with a plurality of extension portions along the circumference of the motor shaft, the extension portions extending radially from the edge of the circuit board along the motor shaft, and the plurality of extension portions correspond to the plurality of buckling structures one by one and buckle with each other.

[0014] In some embodiments, the circuit board is provided with a foolproof portion protruding radially from the edge of the circuit board along the motor shaft, and a foolproof groove corresponding to the foolproof portion is formed on one of the second protrusions and buckles with the foolproof portion.

[0015] In some embodiments, the foolproof portion is different in shape from the extension portion.

[0016] In some embodiments, the circuit board is in the shape of a circular ring.

[0017] In some embodiments, the number of the buckling structures is more than three.

[0018] The embodiments of the present application also provide an electric tool, which comprises the motor described above.

[0019] The present application provides a plurality of protrusions including the first protrusion and the second protrusion on the stator end plate, so that the operator can more easily and directly and correctly install the circuit board during installation, without spending more time for manual identification, and the installed circuit board is more stable, thereby ensuring production efficiency and reducing error rate. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are illustrated by way of example in the figures that are part of this document and which illustrate key principles of the embodiments. The drawings are not to scale, and are solely for purposes of illustration without limiting the scope of the embodiments. Like reference numerals in the figures indicate like elements, unless otherwise specifically stated in the description. The figures in the drawings do not constitute a limitation of the embodiments.

[0021] Figure 1 is a perspective structural schematic diagram of a motor provided by some embodiments of the present application;

[0022] Figure 2 is an assembly structural schematic diagram of a stator assembly and a circuit board in a motor provided by some embodiments of the present application;

[0023] Figure 3 is an exploded structural schematic diagram of a stator assembly in a motor provided by some embodiments of the present application;

[0024] Figure 4 This is a three-dimensional structural diagram of the stator end plate in an electric motor provided in some embodiments of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable readers to better understand this application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0028] like Figures 1 to 4As shown, some embodiments of this application provide a motor including a motor shaft 11, a rotor assembly 12, a stator assembly 13, and a circuit board 14. The rotor assembly 12 is mounted on the motor shaft 11. The stator assembly 13 is arranged around the motor shaft 11 and includes a stator core 131, a stator end plate 132 connected to the stator core 131, and a coil 133 wound on the stator end plate 132. Multiple fastening structures are arranged circumferentially along the motor shaft 11 on the side of the stator end plate 132 away from the stator core 131. Each fastening structure includes a first engaging portion 101 and a second engaging portion 102 arranged opposite to each other, with a slot 103 formed between the first engaging portion 101 and the second engaging portion 102. The circuit board 14 has multiple extension portions 141 arranged circumferentially along the motor shaft 11. Each extension portion 141 corresponds to one of the multiple fastening structures, and each extension portion 141 is engaged in and confined within the slot 103.

[0029] The motor shaft 11 is the power output part of the motor, which can be connected to the actuator of the power tool to transmit the driving force and motion generated by the motor to the end of the actuator to realize the corresponding processing operation. The motor shaft 11 is fixedly connected to the rotor assembly 12 and can rotate synchronously with the rotor assembly 12. The motor shaft 11 has a certain length and can be connected to the input end of the transmission mechanism in the power tool.

[0030] The rotor assembly 12 is the rotatable part of the motor. The rotor assembly 12 includes magnets, which are fixed to the inner wall of the end cover or embedded in the mounting slot of the rotor core, forming an external rotor motor or an internal rotor motor. The rotor assembly 12 can rotate under the magnetic field generated by the stator assembly 13, thereby driving the motor shaft 11 to rotate synchronously.

[0031] The stator assembly 13 is the fixed part of the motor, and a housing 21 can be provided around it for protection. The stator assembly 13 includes a stator core 131, stator end plates 132, and coils 133. The stator core 131 is not only a key part of the motor's magnetic circuit, but also serves to fix and support the coils 133. The coils 133 can be connected to an external circuit via cables 22, and the ends of the cables 22 can be equipped with connectors for electrical connection. When current passes through the coils 133, the generated magnetic field is collected and concentrated in the stator core 131, thereby enhancing and guiding it to the rotor assembly 12, thus driving the rotor assembly 12 to rotate. The stator end plates 132 may include a first end plate and a second end plate arranged opposite each other, which serve as insulation in the stator assembly 13 and can also be called a skeleton, providing electrical isolation between the stator core 131 and the coils 133. The stator assembly 13 as a whole is rotatably connected to the motor shaft 11.

[0032] The snap-fit ​​structure on the stator end plate 132 forms the mounting base for the circuit board 14, which can be used to mount Hall elements or other components. The snap-fit ​​structure forms a slot 103 with a double-clamping part, and the circuit board 14 has an extension 141 that mates with the slot 103. When mounting the circuit board 14, the extension 141 can be snapped into the slot 103 to achieve connection and fixation between the circuit board 14 and the stator end plate 132. The snap-fit ​​part can form a slot 103 with a narrow opening and a wide interior, or a wider area in the middle of the slot 103 to engage the extension 141 on the circuit board 14.

[0033] The motor provided in some embodiments of this application has a fastening structure on one side of the stator end plate 132. The fastening structure is formed by two engaging portions arranged opposite each other. The two engaging portions cooperate to form a slot 103. The circuit board 14 is provided with an extension portion 141, which corresponds to the fastening structure on the stator end plate 132. The circuit board 14 can be assembled by simply inserting the extension portion 141 into the slot 103, thereby avoiding the use of fasteners and simplifying the mating structure between the circuit board 14 and the stator end plate 132. This further improves the assembly efficiency of the circuit board 14.

[0034] In some embodiments, at least one of the first engaging portion 101 and the second engaging portion 102 may undergo elastic deformation.

[0035] The first engaging portion 101 and the second engaging portion 102 have elastic deformation characteristics, allowing them to undergo elastic deformation when the outer extension portion 141 of the circuit board 14 is engaged. Furthermore, after the outer extension portion 141 is engaged in the slot 103, the recovery of the elastic deformation ensures stable engagement between the outer extension portion 141 and the slot 103. In practice, the width of the outer extension portion 141 of the circuit board 14 can be greater than the width of the opening of the slot 103, so that when the outer extension portion 141 is engaged in the slot 103, at least one of the two engaging portions is forced to undergo elastic deformation, thereby achieving cooperation with the stator end plate 132.

[0036] like Figure 2 and Figure 3 As shown, the extension portion 141 can extend radially from the edge of the circuit board 14 along the motor shaft 11. In the circumferential direction of the motor shaft 11, the first engaging portion 101 and the second engaging portion 102 abut against the opposite sides of the extension portion 141.

[0037] The extension portion 141 is on the same plane as the main body of the circuit board 14, forming a protruding portion around the main body of the circuit board 14. When the circuit board 14 is engaged with the stator end plate 132, the circuit board 14 can be assembled by pressing along the axial direction of the motor shaft 11, which facilitates the installation process of the circuit board 14.

[0038] In addition, a limiting part 104 may be provided on the side where the first engaging part 101 and the second engaging part 102 are close to each other, and the limiting part 104 abuts against the side of the extension part 141 away from the stator core 131.

[0039] By providing a limiting part 104 on one side where the two engaging parts are close to each other, a slot 103 with a narrow opening and a wide interior is formed. The limiting part 104 can limit the extension part 141 of the circuit board 14, preventing the extension part 141 located in the slot 103 from dislodging from the slot 103, thereby making the circuit board 14 stably assembled on the stator end plate 132.

[0040] like Figure 4 As shown, the first engaging portion 101 and the second engaging portion 102 may be provided with an inclined surface on the side away from the stator core 131, and the inclined surface is inclined towards the side closer to the stator core 131 in the direction in which the first engaging portion 101 and the second engaging portion 102 approach each other.

[0041] The inclined surface is located at the top of the engaging portion away from the stator core 131, and the height of the inclined surface relative to the stator core 131 gradually decreases in the direction in which the two engaging portions approach each other. This creates a shape where the tops of the two engaging portions in the latching structure are high on both sides and low in the middle. When the extension portion 141 of the circuit board 14 is pressed in, it acts as a guide, facilitating the entry of the extension portion 141 into the slot 103 and smoothly completing the engaging process.

[0042] In some embodiments, the stator end plate 132 may have a plurality of first protrusions 1321 extending outward on the side away from the stator core 131, and each first protrusion 1321 has a fastening structure at its protruding end.

[0043] The first protrusion 1321 facilitates the installation of the snap-fit ​​structure. The first protrusion 1321 extends outward from one side of the stator end plate 132. It can be positioned on the outer side of the stator end plate 132 away from the motor shaft 11 to avoid interference with other components. In practice, the first protrusion 1321 can be plate-shaped to accommodate the snap-fit ​​mechanism. Furthermore, the first protrusion 1321 can have a certain curvature to accommodate its fit with the outer edge of the circuit board 14.

[0044] In addition, a plurality of second protrusions 1322 may be provided on the side of the stator end plate 132 away from the stator core 131, and the plurality of second protrusions 1322 abut against the side of the circuit board 14 away from the motor shaft 11.

[0045] The second protrusion 1322 is arranged around the fixed position of the circuit board 14, and can play a limiting role in the peripheral area of ​​the circuit board 14. The height of the second protrusion 1322 is higher than the mounting position of the circuit board 14, and can abut against the outer side of the circuit board 14 away from the motor shaft 11. Thus, the second protrusion 1322 restricts the radial movement of the circuit board 14 on the motor shaft 11, ensuring the accuracy of the circuit board 14's position. In other words, by providing multiple protrusions, including the first protrusion 1321 and the second protrusion 1322, on the stator end plate, the operator can more easily and directly complete the correct installation of the circuit board during the installation process, without spending more time on manual identification, and the installed circuit board is more stable, ensuring production efficiency and reducing the error rate.

[0046] In some embodiments, the first protrusion 1321 and the second protrusion 1322 may be arranged sequentially in the circumferential direction of the motor shaft 11, and the number of the second protrusions 1322 is not less than the number of the first protrusions 1321. Further, there are three second protrusions 1322, which are arranged at equal intervals.

[0047] In other words, the first protrusion 1321 and the second protrusion 1322 are arranged sequentially in a certain number along the circumference of the motor shaft 11. Each first protrusion 1321 is adjacent to a certain number of second protrusions 1322 along the circumference of the motor shaft 11. The circuit board 14 can be fixed at the location of the first protrusion 1321. The circuit board 14 can be limited at the location of the second protrusion 1322. Thus, the stability of the circuit board 14 during assembly with the stator end plate 132 is ensured through the cooperation between the first protrusion 1321 and the second protrusion 1322. In practice, the first protrusion 1321 and the second protrusion 1322 can be arranged one or more at intervals, so that the first protrusion 1321 and the second protrusion 1322 are distributed relatively evenly along the circumference of the motor shaft 11.

[0048] In some embodiments, a foolproof part 142 is provided on the circuit board 14 extending radially from the edge of the circuit board 14 along the motor shaft 11, and a foolproof groove 105 corresponding to and engaging with the foolproof part 142 is provided on one of the second protrusions 1322.

[0049] In some embodiments, the foolproof part 142 and the extension part 141 have different shapes to facilitate the distinction between the foolproof design and the fixing design on the circuit board. In particular, when the circuit board 14 is circular in some embodiments, it is difficult to identify the correct mounting orientation of the circuit board 14. Providing the foolproof part 142 and further modifying the design of the foolproof part 142 can reduce the occurrence of assembly errors.

[0050] In some embodiments, the number of fastening structures can be three or more.

[0051] The number of snap-fit ​​structures affects the assembly effect of circuit board 14. Increasing the number of snap-fit ​​structures can improve the stability of the connection between circuit board 14 and stator end plate 132. In practice, the number of snap-fit ​​structures can be three, four, or five. Figure 4 As shown, four fastening structures can be provided on one side of the stator end plate 132. The four fastening structures are distributed in the circumferential direction of the motor shaft 11 and can fix the circuit board 14 from different positions.

[0052] Some embodiments of this application also provide an electric tool, which includes the motor described above.

[0053] Power tools can be common handheld power tools, such as electric screwdrivers, electric grinders, or electric reciprocating saws. Power tools can also be larger, push-type tools, such as lawnmowers. The actuators of power tools are driven by motors to perform the corresponding machining operations.

[0054] The motor can be integrally assembled into the housing of the power tool, eliminating the need for screws or other fasteners to engage with the stator end plate 132 within the motor's circuit board 14. This reduces the assembly difficulty of the circuit board 14 and simplifies its assembly structure. During actual assembly, the circuit board 14 and stator end plate 132 can be fixedly connected by pressing. Using this type of motor in the power tool simplifies motor assembly and positioning, thereby improving assembly efficiency.

[0055] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this application.

Claims

1. An electric motor, characterized in that, include: Motor shaft; The rotor assembly is mounted on the motor shaft; A stator assembly is arranged around the motor shaft. The stator assembly includes a stator core, a stator end plate connected to the stator core, and a coil wound on the stator end plate. The stator end plate has multiple fastening structures arranged circumferentially along the motor shaft on the side away from the stator core. The circuit board has a plurality of first protrusions extending from the side of the stator end plate away from the stator core, and each of the first protrusions has a fastening structure at its protruding end for fixing the circuit board to the stator end plate. The stator end plate is further provided with a plurality of second protrusions on the side away from the stator core, and the plurality of second protrusions abut against the side of the circuit board away from the motor shaft.

2. The motor according to claim 1, characterized in that: The first protrusion and the second protrusion are arranged sequentially in the circumferential direction of the motor shaft.

3. The motor according to claim 1, characterized in that: The number of the second protrusions is not less than the number of the first protrusions.

4. The motor according to claim 1, characterized in that: The second protrusion has three parts, which are equally spaced from each other.

5. The motor according to claim 1, characterized in that: The circuit board has multiple extension portions along the circumference of the motor shaft. The extension portions extend radially from the edge of the circuit board along the motor shaft. Each of the multiple extension portions corresponds to a multiple of the fastening structures and fastens to each other.

6. The motor according to claim 5, characterized in that: A foolproof part is provided on the circuit board extending radially from the edge of the circuit board along the motor shaft, and one of the second protrusions is provided with a foolproof groove that corresponds to and engages with the foolproof part.

7. The motor according to claim 6, characterized in that: The shape of the error-proof part is different from that of the extension part.

8. The motor according to claim 1, characterized in that: The circuit board is circular.

9. The motor according to claim 1, characterized in that: The number of the fastening structures is three or more.

10. A power tool, characterized in that, Includes the motor as described in any one of claims 1 to 9.

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