stator assembly

Abstract

The utility model discloses a kind of stator assemblies, including stator core, stator end plate, stator coil, connecting terminal and lead-out wire, connecting terminal includes main plate part and electric connection part, electric connection part connects stator coil and lead-out wire electrically;Electric connection part includes first electric connection part, second electric connection part and third electric connection part, first electric connection part electrically connects stator coil, second electric connection part and / or third electric connection part electrically connects lead-out wire;The thickness direction of definition main plate part is first direction and the direction of intersection with first direction is second direction, first electric connection part is set in the side of main plate part along first direction;Second electric connection part and third electric connection part are located on the two sides of first electric connection part in second direction. The connecting terminal can adapt to the wiring requirement of different positions on stator end plate, has higher universality, and can reduce production difficulty and production cost.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a stator assembly. Background Technology

[0002] The motor is the core component of power tools, providing power. The motor's structural design is crucial for optimizing power tools. In brushless motors, enameled wire can be electrically connected to terminals on the stator, which in turn connect to external leads. In other words, the enameled wire can be electrically connected to external leads via these terminals. Generally, the terminals on the stator can be located on the outer periphery of the stator core or fixed to an end plate on the axial side of the stator core. The former increases the motor's radial dimension, while the latter increases its axial dimension, making it unsuitable for power tools requiring a compact design. Furthermore, for pistol-shaped power tools (such as pistol drills), the stator leads (power lines) need to be concentrated within a small angle range on the same side due to product design requirements. Since stator coils are typically multiple and spaced apart, the routing of the coils differs at different locations. Therefore, the terminals need to be constructed with different structures to accommodate the routing requirements at different locations.

[0003] The existing connection terminals are not universal, which increases the difficulty of motor assembly and the manufacturing cost of motor. Utility Model Content

[0004] The purpose of this utility model is to provide a stator assembly that, through the second and third electrical connection parts respectively provided on both sides of the main board, enables multi-directional adaptation and connection of the stator coil and the lead wire, significantly improving the versatility of the connection terminals, optimizing the miniaturization design of the motor and reducing production costs. In particular, it can reduce the production difficulty and production cost of motors and power tools equipped with this stator assembly.

[0005] To solve the above-mentioned technical problems, this utility model provides a stator assembly, including a stator core, a stator end plate mounted on the stator core, a stator coil fixed to the stator end plate and the stator core, a connecting terminal fixed to the stator end plate, and a lead wire electrically connected to the stator coil. The connecting terminal includes a main board portion and an electrical connection portion connected to the main board portion. The electrical connection portion electrically connects the stator coil and the lead wire. The electrical connection portion includes a first electrical connection portion, a second electrical connection portion, and a third electrical connection portion. The first electrical connection portion electrically connects to the stator coil, and the second electrical connection portion and / or the third electrical connection portion electrically connects to the lead wire. The thickness direction of the main board portion is defined as a first direction, and the direction intersecting the first direction is defined as a second direction. The first electrical connection portion is disposed on one side of the main board portion along the first direction. The second electrical connection portion and the third electrical connection portion are located on both sides of the first electrical connection portion in the second direction.

[0006] Through a three-dimensional layout design of three electrical connection parts—the first electrical connection part extending vertically along the thickness direction, and the second and third electrical connection parts extending obliquely—a multi-directional electrical connection port is formed. This layout can adapt to the spatial orientation requirements of different lead wires and can construct connection paths within a limited area, significantly improving the terminal's scenario adaptability. The connection terminal is equipped with different electrical connection parts: the first, second, and third electrical connection parts. The first electrical connection part is located on one side of the main board along a first direction, the second electrical connection part is located on one side of the main board along a second direction at an angle to the first direction, and the third electrical connection part is located on the other side of the main board. The first electrical connection part is used to electrically connect the stator coil, and the second and third electrical connection parts are used to electrically connect the lead wires. The first direction is the thickness direction of the main board. In other words, the connection terminal has multiple electrical connection parts, and since the second and third electrical connection parts are arranged opposite to each other, even if the same connection terminal is set at different positions on the stator end plate, different electrical connection parts can be selected for connection according to the actual wiring requirements. That is, the connection terminal can adapt to different wiring requirements on the stator end plate, has high versatility, and can reduce the production difficulty and production cost of motors equipped with this stator assembly.

[0007] Optionally, the motherboard portion includes a first end and a second end disposed opposite to each other along its length direction, the second electrical connection portion and the third electrical connection portion being closer to the first end than the second end; the second electrical connection portion and the third electrical connection portion are arranged symmetrically with respect to the motherboard portion.

[0008] By centralizing the electrical connections at the lower end of the main board, the conductive distance between the stator coils and the leads is shortened. This compact design not only optimizes current transmission efficiency but also reduces positioning complexity during assembly, making it particularly suitable for the rapid alignment requirements of automated production lines. The partitioned layout also avoids signal crosstalk between different electrical connections. The symmetrical design of the second and third electrical connections enhances the versatility of the connection terminals.

[0009] Optionally, the first electrical connection portion includes a bent portion and an extension portion. The bent portion is connected to the first end and bends and extends along the first direction. One end of the extension portion is connected to the end of the bent portion away from the main board portion, and the other end of the extension portion extends toward the second end. An accommodating space is formed between the extension portion and the main board portion, and the terminal of the stator coil extends into the accommodating space and is fixedly connected to the first electrical connection portion.

[0010] The bending section and the extension section work together to create a three-dimensional accommodating space, achieving comprehensive constraint on the stator coil terminals. The cantilever design of the extension section forms a flexible clamping structure, which can accommodate terminals of different wire diameters and provide a stable support reference surface during welding. The gap between the main board and the extension section forms a natural heat dissipation channel, improving current carrying capacity.

[0011] Optionally, the first electrical connection portion further includes a stepped portion, one end of which is connected to the end of the bent portion away from the main board portion, and the other end of which is connected to the end of the extension portion near the first end. The extension portion is connected to the bent portion via the stepped portion. A portion of the stepped portion protrudes from the surface of the extension portion toward the main board portion to form a stepped surface. The stepped surface protrudes from the second electrical connection portion and the third electrical connection portion in the thickness direction of the stator end plate. The stepped surface carries the terminals of the stator coil.

[0012] The stepped structure of the stepped section provides layered routing space for terminals and leads, avoiding insulation risks caused by wire crossing. The raised design of the stepped surface forms a welding positioning reference, ensuring that solder joints are evenly distributed in the stress area and enhancing the reliability of mechanical connections. This structure also guides the directional flow of solder, forming a dense connection interface.

[0013] Optionally, the stepped portion includes an integrally connected first segment and a second segment, one end of the first segment being connected to the bent portion, the other end of the first segment being connected to one end of the second segment, and the other end of the second segment being connected to the extension portion; the first segment extends in a direction from the first end toward the second end, and in the direction from the first end toward the second end, the second segment is inclined in a direction away from the main board portion, and at least a portion of the surface of the second segment toward the main board portion forms the stepped surface.

[0014] The segmented deformable structure of the stepped section provides rigid positioning in the first segment and forms an adaptive adjustment zone in the second segment. When the terminal is inserted, the stepped section generates a progressive clamping force, which can compensate for manufacturing tolerances and absorb minor displacements caused by operational vibrations. The bidirectional elasticity effectively prevents fatigue fracture of the terminal.

[0015] Optionally, the stator end plate is annular, and the second electrical connection portion and the third electrical connection portion extend in opposite directions along the circumference of the stator end plate and are in contact with the surface of the stator end plate.

[0016] The electrical connection extends in the opposite direction along the circumference of the annular end plate, making full use of the curved surface of the end plate edge for conductor arrangement. This layout allows the lead wires to naturally conform to the contour of the end plate, eliminating vibration and noise problems caused by suspended wire segments.

[0017] Optionally, the connection terminal further includes two fixing parts connected to the main board, and the stator end plate further includes mounting parts corresponding to the fixing parts; the two fixing parts are spaced apart on opposite sides of the main board, and the two fixing parts are respectively corresponding to the second electrical connection part and the third electrical connection part; the stator end plate is provided with two spaced mounting parts, and the fixing parts are connected to the mounting parts in a corresponding manner.

[0018] The symmetrical distributed design of the dual fixing parts enhances the torsional resistance of the terminals by balancing the forces on both sides. The multi-point contact mechanism between the mounting and fixing parts disperses the impact load under vibration conditions. This structure can also maintain stress balance during thermal expansion, preventing cracking and failure at the connection interface.

[0019] Optionally, the two fixing parts extend obliquely away from each other in the first direction, and the fixing parts and the main board part form an angle α, satisfying: 120°≤α≤160°.

[0020] The inclined extension design of the fixing part and the main board part forms a buffer area while ensuring installation strength. The elastic deformation capability within a specific angle range can absorb assembly tolerances and thermal deformation during operation, avoiding stress concentration caused by rigid connections. The inclined angle optimizes the overall center of gravity position of the terminals, improving dynamic stability.

[0021] Optionally, the side of the fixing part is provided with continuously distributed helical teeth.

[0022] The continuous helical tooth structure on the side of the fixing part enhances the mechanical interlocking effect with the mounting part through multi-stage meshing. The directional arrangement of the helical teeth creates a self-locking effect, maintaining contact pressure continuously under vibration. The tooth structure also increases the contact surface area, improving conductivity while preventing oxide layer accumulation.

[0023] Optionally, the main board portion, the fixing portion, and the electrical connection portion are an integral component.

[0024] The one-piece molding process eliminates the joint defects of traditional segmented terminals, ensuring the integrity of the current path. The seamless structure significantly improves mechanical strength and avoids the risk of fatigue fracture. The integrated design also simplifies the manufacturing process and reduces the difficulty and cost of precision assembly.

[0025] The beneficial effects of this utility model are as follows: The stator assembly provided by this utility model has different electrical connection parts on the connection terminal, namely a first electrical connection part, a second electrical connection part, and a third electrical connection part. The first electrical connection part is disposed on one side of the main board part along a first direction, the second electrical connection part is disposed on one side of the main board part along a second direction at an angle to the first direction, and the third electrical connection part is symmetrically disposed on the other side of the main board part with the second electrical connection part. The first electrical connection part is used to electrically connect the stator coil, and the second and third electrical connection parts are used to electrically connect the lead wires. The first direction is the thickness direction of the main board part. That is to say, the connection terminal has multiple electrical connection parts, and because the second and third electrical connection parts are arranged opposite each other, even if the same connection terminal is disposed at different positions on the stator end plate, different electrical connection parts can be selected for connection according to the actual wiring requirements. In other words, the connection terminal can adapt to different wiring requirements on the stator end plate, has high versatility, and can reduce the production difficulty and production cost of the motor equipped with this stator assembly. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0027] Figure 1 This is a schematic diagram of the structure of a stator assembly according to an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the connection terminal structure in an embodiment of this application;

[0029] Figure 3 yes Figure 2 A side view of the connection terminals shown;

[0030] Figure 4 yes Figure 2 A top view of the connection terminals shown;

[0031] Figure 5 This is a schematic diagram of the stator end plate in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Stator assembly; 1a. Stator coil; 1b. Lead wire; 1c. Stator core; 11. Connecting terminal; 111. Main board; 111a. First end; 111b. Second end; 112. Fixing part; 112a. Helical tooth; 113. Electrical connection part; 1131. First electrical connection part; 1131a. Bending part; 1131b. Extension part; 1131c. Stepped part; 1131d. Stepped surface; 1131e. First section; 1131f. Second section; 1132. Second electrical connection part; 1133. Third electrical connection part; 12. Stator end plate; 12a. Wire slot; 121. Mounting part; 121a. Slot; A1. Accommodation space; P1. First direction; P2. Second direction. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model 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 provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0035] In this embodiment of the invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0037] Furthermore, the terms "installation," "setting," "equipped with," "opening," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0038] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0039] This application provides a stator assembly with multiple electrical connection portions on its connection terminals. Since the second and third electrical connection portions are arranged opposite to each other, even if the same connection terminals are provided at different positions on the stator end plate, different electrical connection portions can be selected for connection according to actual wiring requirements. That is, the connection terminals can adapt to different wiring requirements on the stator end plate, have high versatility, and can reduce the production difficulty and production cost of motors equipped with the stator assembly.

[0040] The implementation details of the stator component in this embodiment will be described in detail below. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0041] Please see also Figures 1 to 5 , Figure 1 This is a schematic diagram of the structure of a stator assembly 1 in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of the connection terminal 11 in an embodiment of this application. Figure 3 yes Figure 2 The side view of the connection terminal 11 shown is shown. Figure 4 yes Figure 2 The top view of the connecting terminal 11 shown is shown. Figure 5 This is a schematic diagram of the stator end plate 12 in the embodiments of this application.

[0042] In some embodiments, the stator assembly 1 includes a connection terminal 11, which serves as an electrical connector to electrically connect the stator coil 1a in the stator to the lead wire 1b outside the stator, supplying power to the stator coil 1a through the lead wire 1b, thereby driving the rotor to rotate using the energized stator coil 1a.

[0043] It should be noted that lead 1b can also be called a power line. Usually, lead 1b is electrically connected to the power supply, and the power supply supplies power to the stator coil 1a through lead 1b and connection terminal 11.

[0044] It is understood that the stator typically includes multiple stator coils 1a, that is, the stator assembly 1 has multiple stator coils 1a, which are arranged at intervals. Correspondingly, multiple connection terminals 11 are also provided, and they are arranged at intervals. Each connection terminal 11 can be connected to at least one stator coil 1a. In this application, the example of each connection terminal 11 electrically connecting two stator coils is used for illustration, but it is not intended to imply that the following content applies only to this example.

[0045] In some embodiments, the stator assembly 1 includes a stator end plate 12, which is typically disposed on one axial side of the stator core 1c for fixing the stator coil 1a and the lead wire 1b. The stator end plate 12 is made of insulating material; for example, the stator end plate 12 may be made of plastic, such as rigid plastic or fire-resistant and heat-resistant plastic.

[0046] In some embodiments, multiple connection terminals 11 are disposed on the stator end plate 12 at intervals. That is, the stator end plate 12 can also serve as a support platform for the connection terminals 11.

[0047] In some embodiments, the connection terminal 11 includes a main board portion 111, a fixing portion 112, and an electrical connection portion 113. Both the fixing portion 112 and the electrical connection portion 113 are connected to the main board portion 111. The electrical connection portion 113 is used for electrical connection with the stator coil 1a and the lead wire 1b.

[0048] In some embodiments, the stator end plate 12 is provided with a mounting portion 121, and the fixing portion 112 of the connecting terminal 11 is connected to the mounting portion 121 to fix the connecting terminal 11 on the stator end plate 12.

[0049] In some embodiments, the electrical connection portion 113 includes a first electrical connection portion 1131, a second electrical connection portion 1132, and a third electrical connection portion 1133. The first electrical connection portion 1131 is disposed on one side of the main board portion 111 along a first direction P1, the second electrical connection portion 1132 is disposed on the side of the main board portion 111 along a second direction P2 at an angle to the first direction P1, and the third electrical connection portion 1133 is symmetrically disposed with the second electrical connection portion 1132 and located on the other side of the main board portion 111. The first electrical connection portion 1131 is used to electrically connect the stator coil 1a, while the second and third electrical connection portions 1132 and 1133 are used to electrically connect the lead wire 1b.

[0050] In some embodiments, the first direction P1 is the thickness direction of the motherboard portion 111, that is, the first electrical connection portion 1131 is disposed on one side of the motherboard portion 111 along the thickness direction of the motherboard portion 111. In some embodiments, the second direction P2 is disposed perpendicular to the first direction P1.

[0051] With this configuration, the connecting terminal 11 has multiple electrical connection parts 113. Since the second electrical connection part 1132 and the third electrical connection part 1133 are arranged symmetrically, even if the same connecting terminal 11 is provided at different positions on the stator end plate 12, different electrical connection parts 113 can be selected for connection according to the actual wiring requirements. That is, the connecting terminal 11 can adapt to different wiring requirements on the stator end plate 12, has high versatility, and can reduce the production difficulty and production cost of the motor equipped with the stator assembly 1.

[0052] In some embodiments, the second electrical connection portion 1132 and the third electrical connection portion 1133 may be asymmetrically arranged, with a significant shape change at the location where electrical connection with the lead wire 1b is required, thus preventing mis-soldering. Specifically, the second electrical connection portion 1132 may be designed as an L-shaped structure, while the third electrical connection portion 1133 may be a straight structure, creating a significant difference in shape and extension direction. This asymmetrical design allows operators to visually distinguish the functional positioning of the two electrical connections when soldering the lead wire 1b, avoiding incorrect soldering of the lead wire to the unwanted end. Furthermore, the end of the second electrical connection portion 1132 may be provided with a raised mark or a slotted structure to further enhance its visual differentiation from the third electrical connection portion 1133, thereby improving assembly efficiency and reliability.

[0053] In some embodiments, the main board portion 111 has a sheet / plate structure, which makes the overall connection terminal 11 thinner and lighter, and avoids the connection terminal 11 from being too large.

[0054] In some embodiments, the motherboard portion 111 includes a first end 111a and a second end 111b, with a second electrical connection portion 1132 and a third electrical connection portion 1133 closer to the first end 111a relative to the second end 111b. Please refer to the accompanying drawings. Figure 2 The second electrical connection portion 1132 and the third electrical connection portion 1133 are provided at the first end 111a below the main board portion 111, and the second electrical connection portion 1132 and the third electrical connection portion 1133 are formed by bending and extending from the lower end of the fixing portion 112 on both sides of the main board portion 111.

[0055] In some embodiments, the first electrical connection portion 1131 includes a bent portion 1131a and an extension portion 1131b. The bent portion 1131a is connected to the first end 111a and extends bent along the thickness direction of the main board portion 111. One end of the extension portion 1131b is connected to the end of the bent portion 1131a away from the main board portion 111, and the other end of the extension portion 1131b extends toward the second end 111b. Meanwhile, the extension portion 1131b and the main board portion 111 are spaced apart, thereby forming an accommodating space A1 between the extension portion 1131b and the main board portion 111. When the connection terminal 11 is connected to the terminal of the stator coil 1a, the terminal of the stator coil 1a extends into the accommodating space A1 and is fixedly connected to the first electrical connection portion 1131. In this way, the first electrical connection part 1131, through its bending design, forms an accommodating space A1 with the main board part 111. When the terminal of the stator coil 1a extends into the accommodating space A1 and connects to the first electrical connection part 1131, the main board part 111 and the first electrical connection part 1131 can be used to limit and fix the terminal of the stator coil 1a, thereby improving the connection strength and stability between the stator coil 1a and the first electrical connection part 1131. After the terminal of the stator coil 1a is hung in the accommodating space A1, the first electrical connection part 1131 can be flattened towards the main board part 111 and fixed by welding with a welding device, which can further ensure the stability of the connection, and even high-intensity shaking will not cause the connection to become unstable.

[0056] It is understood that the bent portion 1131a and the extension portion 1131b can also be sheet-like / plate-like structures. The bent portion 1131a is formed by bending sheet-like metal, and the extension portion 1131b can be a straight plate or bend at a certain angle or arc. For example, the portion of the extension portion 1131b near the second end 111b can be bent towards the main board portion 111, so that the extension portion 1131b forms an angle greater than 0° and not exceeding 20°. This provides sufficient spacing between the middle of the extension portion 1131b and the main board portion 111, allowing the terminal of the stator coil 1a to extend into the receiving space A1. Simultaneously, the bent portion of the extension portion 1131b near the second end 111b can limit the terminal at the aforementioned gap opening, preventing the terminal from detaching from the receiving space A1 due to its own elasticity or external force before it is fixedly connected to the first electrical connection portion 1131.

[0057] Optionally, the bent portion 1131a can be bent into a U-shaped, V-shaped, semi-circular or semi-elliptical bent structure, which is not specifically limited in this application.

[0058] Please combine Figure 3As shown. In some embodiments, the first electrical connection portion 1131 further includes a stepped portion 1131c. One end of the stepped portion 1131c is connected to the end of the bent portion 1131a away from the main board portion 111, and the other end of the stepped portion 1131c is connected to the end of the extension portion 1131b near the first end 111a. The extension portion 1131b is connected to the bent portion 1131a via the stepped portion 1131c. A portion of the stepped portion 1131c protrudes from the surface of the extension portion 1131b toward the main board portion 111 to form a stepped surface 1131d. The stepped surface 1131d protrudes from the second electrical connection portion 1132 and the third electrical connection portion 1133 in the thickness direction of the stator end plate 12. The stepped surface 1131d is used to carry the terminal of the stator coil 1a so that the terminal of the stator coil 1a is offset from the lead wire 1b in the thickness direction of the stator end plate 12.

[0059] A stepped portion 1131c is provided through the first electrical connection portion 1131. A portion of the stepped portion 1131c protrudes from the extension portion 1131b toward the stepped portion 1131c to form a stepped surface 1131d. The stepped surface 1131d can carry the terminal of the stator coil 1a that is electrically connected to the first electrical connection portion 1131. In this way, the terminal of the stator coil 1a and the lead wire 1b are staggered in the thickness direction (i.e., axial direction) of the stator end plate 12, so that the terminal of the stator coil 1a and the lead wire 1b at least partially overlap in the radial direction (perpendicular to the axial direction) of the stator end plate 12, which can reduce the radial dimension of the stator assembly 1.

[0060] Understandably, the stepped portion 1131c can also be formed in a similar manner to the bent portion 1131a, that is, by bending a sheet-like or plate-like structure to form the stepped portion 1131c.

[0061] In some embodiments, the stepped portion 1131c includes an integrally connected first segment 1131e and second segment 1131f. One end of the first segment 1131e is connected to the bent portion 1131a, and the other end of the first segment 1131e is connected to one end of the second segment 1131f. The other end of the second segment 1131f is connected to the extension portion 1131b. The first segment 1131e extends in a direction from the first end 111a toward the second end 111b. In the direction from the first end 111a toward the second end 111b, the second segment 1131f is inclined in a direction away from the main board portion 111. At least a portion of the surface of the second segment 1131f toward the main board portion 111 forms the stepped surface 1131d.

[0062] The stepped portion 1131c is composed of an integrally connected first segment 1131e and a second segment 1131f, meaning that the stepped portion 1131c is a one-piece molded structure, which makes the overall structural strength and stability of the stepped portion 1131c higher. At the same time, the curved and inclined surface design of the stepped portion 1131c gives it a certain degree of elasticity. When the terminal of the stator coil 1a is inserted into the receiving space A1, under the elastic action of the stepped portion 1131c, the extension portion 1131b can cooperate with the main board portion 111 to clamp and fix the terminal, thus self-fixing the terminal. In this way, when the terminal is soldered to the connecting terminal 11, no additional fixing device or fixing means are required, which can reduce the connection difficulty between the stator coil 1a and the connecting terminal 11.

[0063] In some embodiments, the stator end plate 12 is constructed as an annular shape, and the second direction P2 can be the circumferential direction of the stator end plate 12. When the stator end plate 12 is annular, the second direction P2 can be the circumferential direction of the stator end plate 12. In this case, the extension directions at different positions on the second electrical connection portion 1132 and the third electrical connection portion 1133 are the tangential directions of the circumference at that position. That is, the angle between the extension directions of the second electrical connection portion 1132 and the third electrical connection portion 1133 and the first direction P1 varies, and both the second electrical connection portion 1132 and the third electrical connection portion 1133 are arc-shaped plates.

[0064] Understandably, when the stator end plate 12 is annular, setting the second electrical connection portion 1132 and the third electrical connection portion 1133 to extend along the circumferential direction of the stator end plate 12 can make the second electrical connection portion 1132 and the third electrical connection portion 1133 adapt to the shape of the stator end plate 12, avoid the stator assembly 1 from protruding in multiple directions, and make the overall shape of the stator assembly 1 more regular.

[0065] Furthermore, in the circumferential direction of the stator end plate 12, the second electrical connection portion 1132 and the third electrical connection portion 1133 extend in a direction away from each other and are attached to the stator end plate 12. This allows both the second electrical connection portion 1132 and the third electrical connection portion 1133 to have ample space for electrical connection with the lead wire 1b. Simultaneously, since both the second electrical connection portion 1132 and the third electrical connection portion 1133 are attached to the surface of the stator end plate 12, it helps to make the stator assembly 1 more compact overall, which is beneficial for the miniaturization design of the stator assembly 1. Furthermore, since the second electrical connection portion 1132 and the third electrical connection portion 1133 extend away from each other, when the connection terminal 11 is electrically connected to the lead wire 1b, the connection terminal 11 can be provided at different positions on the stator end plate 12. Then, the second electrical connection portion 1132 or the third electrical connection portion 1133 located at different positions on the main board portion 111 can be selected to electrically connect to the lead wire 1b as needed, without the need to provide connection terminals with different structures, thereby improving the versatility of the connection terminal 11.

[0066] In some embodiments, at least one of the second electrical connection portion 1132 and the third electrical connection portion 1133 may also be configured as a straight plate, that is, the extension direction of at least one of the second electrical connection portion 1132 and the third electrical connection portion 1133 forms a fixed angle with the first direction P1, which will not be elaborated here.

[0067] In some embodiments, holes may be drilled in at least one of the second electrical connection portion 1132 and the third electrical connection portion 1133, and connecting members such as screws and rivets may be passed through the holes to fix the connecting terminal 11 to the stator end plate 12, so as to improve the bonding strength between the connecting terminal 11 and the stator end plate 12.

[0068] In some embodiments, at least one of the second electrical connection portion 1132 and the third electrical connection portion 1133 may be bent upward or downward to form a wire-clamping space, or a groove may be formed to form a wire-clamping space, into which the lead wire 1b may extend to achieve initial fixation of the lead wire 1b, facilitating the soldering of the lead wire 1b.

[0069] In some embodiments, in the thickness direction of the motherboard portion 111, the fixing portion 112 extends in a direction away from the first electrical connection portion 1131, the second electrical connection portion 1132 is connected to the fixing portion 112, and the second electrical connection portion 1132 and the third electrical connection portion 1133 are connected to the motherboard portion 111 via the fixing portion 112. The fixing portion 112 is also perpendicular to the second electrical connection portion 1132 and the third electrical connection portion 1133.

[0070] In some embodiments, in the thickness direction of the main board portion 111, the fixing portion 112 extends toward a direction away from the first electrical connection portion 1131 and is disposed on the side of the main board portion 111 opposite to the first electrical connection portion 1131. Thus, when the connection terminal 11 is fixed to the stator end plate 12, the fixing portion 112 and the mounting portion 121 are located on one side of the main board portion 111, and the first electrical connection portion 1131 is located on the other side of the main board portion 111, so that the mounting portion 121 does not interfere with the first electrical connection portion 1131, avoiding the influence of the mounting portion 121 on the stator coil 1a and the first electrical connection portion 1131.

[0071] In some embodiments, there are two fixing parts 112, which are spaced apart on opposite sides of the main board part 111. The two fixing parts 112 are respectively corresponding to the second electrical connection part 1132 and the third electrical connection part 1133. The second electrical connection part 1132 and the third electrical connection part 1133 are connected to the main board part 111 through their respective fixing parts 112.

[0072] Furthermore, corresponding to the two fixing parts 112, the stator end plate 12 is provided with two compatible mounting parts 121 for each connecting terminal 11. Each connecting terminal 11 is assembled and fixed with its own two fixing parts 112 and the corresponding two mounting parts 121. This increases the contact area between the connecting terminal 11 and the stator end plate 12, improving the connection strength between the connecting terminal 11 and the stator end plate 12. At the same time, the two fixing parts 112 are provided on opposite sides of the main board part 111, and the two mounting parts 121 are provided corresponding to the two fixing parts 112. When the connecting terminal 11 is provided on the stator end plate 12, when the stator end plate 12 and / or the connecting terminal 11 are subjected to external forces, the force distribution can be more balanced, improving the stability of the connecting terminal 11 on the stator end plate 12.

[0073] In some embodiments, the fixing part 112 may also be configured as a sheet or plate, while the mounting part 121 has a corresponding slot 121a, and the fixing part 112 is fixed to the mounting part 121 by inserting into the slot 121a.

[0074] In some embodiments, the fixing part 112 is provided with helical teeth 112a, the height of which gradually decreases in the insertion direction of the fixing part 112. Thus, during the insertion of the fixing part 112 into the slot 121a, the helical teeth 112a can serve as a guide and prevent incorrect insertion, facilitating assembly. After the fixing part 112 is inserted into the slot 121a, the helical teeth 112a abut against the inner wall of the slot 121a, increasing the bonding strength between the fixing part 112 and the inner wall of the slot 121a, making it difficult for the fixing part 112 to detach from the mounting part 121.

[0075] In some embodiments, a portion of the fixing portion 112 away from the main board portion 111 is bent toward the main board portion 111, and the bent portion is the same as the insertion slot 121a. A helical tooth 112a is disposed on the bent portion of the fixing portion 112. In some embodiments, the inclination direction of the helical tooth 112a forms an acute angle of 30°-60° with the extending direction of the fixing portion 112, and the helical tooth depth is 0.3-1.0 mm, used to enhance the riveting engagement force with the stator end plate 12.

[0076] Please combine Figure 4As shown. In some embodiments, in the thickness direction of the main board portion 111, the two fixing portions 112 also extend obliquely away from each other. Exemplarily, an included angle α can be formed between the fixing portions 112 and the main board portion 111, and 120°≤α≤160°. By making the two fixing portions 112 obliquely arranged, the radial dimension of the stator assembly 1 can be increased without significantly increasing the bonding area between the connecting terminal 11 and the stator end plate 12, thus maintaining a reduced overall volume of the stator assembly 1 and facilitating a compact design of the stator assembly 1. At the same time, the structural strength of the connecting terminal 11 can be appropriately improved by reasonably setting the included angle between the main board portion 111 and the fixing portions 112.

[0077] Understandably, when α < 120°, the dimension of the fixing part 112 in the thickness direction of the main plate part 111 needs to be extended to appropriately increase the bonding area between the fixing part 112 and the stator end plate 12, which will result in a significant increase in the radial dimension of the stator assembly 1. When α > 160°, the fixing part 112 may interfere with the output terminal of the stator coil 2a connected to the second electrical connection part 1132 or the third electrical connection part 1133.

[0078] In some embodiments, the main board portion 111, the fixing portion 112, and the electrical connection portion 113 are an integral component. That is, the main board portion 111, the fixing portion 112, the first electrical connection portion 1131, the second electrical connection portion 1132, and the third electrical connection portion 1133 are an integral component. This improves the overall structural strength of the connection terminal 11, enabling it to remain stable under external forces, thereby enhancing the structural stability of the stator assembly 1 and extending the service life of the connection terminal 11.

[0079] It is understood that the fixing part 112 is only one optional embodiment of the fixing method between the connecting terminal 11 and the stator end plate 12. The core technical feature of this application is that a reliable electrical connection between the stator coil 1a and the lead wire 1b is achieved through the electrical connection part 113, especially by avoiding missoldering problems through symmetrical or asymmetrical layout design. The specific structure of the fixing part 112 is not a necessary technical feature to achieve the above functions. In some embodiments, the fixing of the connecting terminal 11 can be achieved by various alternative methods, such as: snap-fit ​​elastic locking (e.g. Figure 2 The main board 111 can be fitted with elastic barbs on both sides to engage with the stator end plate 12 slots, or it can be joined by welding (direct welding between the main board 111 and the stator end plate 12 contact surfaces) or by injection molding (the connecting terminal 11 is embedded in the injection molding material of the stator end plate 12). These alternative solutions can all ensure the stable installation of the connecting terminal 11 without affecting the function of the electrical connection part 113.

[0080] Please combine Figure 5As shown. In some embodiments, a wire-holding groove 12a may also be provided on the stator end plate 12. The wire-holding groove 12a is located on the outer side of the mounting portion 121 in the radial direction of the stator end plate 12. When the lead wire 1b extends outward from the stator end plate 12 after being connected to the second electrical connection portion 1132 and / or the third electrical connection portion 1133, the lead wire 1b can be at least partially embedded in the wire-holding groove 12a in its own radial direction. The wire-holding groove 12a is used to fix and shape the lead wire 1b, making the layout of the lead wire 1b neater.

[0081] The second aspect of this application also provides an electric motor (not shown), which includes the stator assembly 1 described in the first aspect. Because the electric motor provided by this application has the stator assembly 1, the assembly difficulty of the motor can be reduced, the structure of the motor can be optimized, the compactness of the motor can be improved, and the size of the motor can be reduced. In some embodiments, the stator assembly 1 has six stator coils 1a, which are connected in a delta or star configuration, and the stator assembly 1 is provided with three connection terminals 11 as described in the above embodiments. The three connection terminals 11 can be evenly distributed and installed on the stator end plate 12 at 120° intervals, or they can be concentrated and installed at a certain angle (e.g., within 180°). In some embodiments, the number of stator coils 1a can be nine or twelve. In some embodiments, the motor is an internal rotor brushless motor. In some embodiments, the motor is an external rotor brushless motor.

[0082] A third aspect of this application also provides an electric tool (not shown), which is equipped with the motor described in the second aspect. Because the motor is equipped with the stator assembly 1, the wiring difficulty inside the electric tool can be reduced, thereby reducing the assembly difficulty and production cost of the electric tool. This helps to optimize the internal structure of the electric tool and improve its integration. In some embodiments, the electric tool may be a circular saw, jigsaw, electric drill, electric wrench, cutting machine, angle grinder, or garden tool, etc.

[0083] The stator assembly, motor, and power tool provided by the embodiments of this utility model have been described in detail above. Specific examples have been used in this document to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the idea of ​​this utility model. There may be changes in the specific implementation and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A stator assembly comprising a stator core, a stator end plate mounted to the stator core, a stator coil fixed to the stator end plate and the stator core, a connection terminal fixed to the stator end plate, and a lead wire electrically connected to the stator coil, the connection terminal comprising a main plate portion and an electrical connection portion connected to the main plate portion, the electrical connection portion electrically connecting the stator coil and the lead wire, characterized in that: The electrical connection portion includes a first electrical connection portion, a second electrical connection portion, and a third electrical connection portion. The first electrical connection portion is electrically connected to the stator coil, and the second electrical connection portion and / or the third electrical connection portion are electrically connected to the lead wire. The thickness direction of the main board portion is defined as a first direction, and the direction intersecting the first direction is defined as a second direction. The first electrical connection portion is disposed on one side of the main board portion along the first direction. The second electrical connection portion and the third electrical connection portion are located on both sides of the first electrical connection portion in the second direction.

2. The stator assembly according to claim 1, characterized in that: The main board includes a first end and a second end disposed opposite to each other along its length, and the second electrical connection portion and the third electrical connection portion are closer to the first end than the second end; the second electrical connection portion and the third electrical connection portion are arranged symmetrically with respect to the main board.

3. The stator assembly according to claim 2, characterized in that: The first electrical connection portion includes a bent portion and an extension portion. The bent portion is connected to the first end and bends and extends along the first direction. One end of the extension portion is connected to the end of the bent portion away from the main board portion, and the other end of the extension portion extends toward the second end. An accommodating space is formed between the extension portion and the main board portion. The terminal of the stator coil extends into the accommodating space and is fixedly connected to the first electrical connection portion.

4. The stator assembly according to claim 3, characterized in that: The first electrical connection portion further includes a stepped portion, one end of which is connected to the end of the bent portion away from the main board portion, and the other end of which is connected to the end of the extension portion near the first end. The extension portion is connected to the bent portion via the stepped portion. A portion of the stepped portion protrudes from the surface of the extension portion toward the main board portion to form a stepped surface. The stepped surface protrudes from the second electrical connection portion and the third electrical connection portion in the thickness direction of the stator end plate. The stepped surface carries the terminals of the stator coil.

5. The stator assembly according to claim 4, characterized in that: The stepped portion includes an integrally connected first segment and a second segment. One end of the first segment is connected to the bent portion, and the other end of the first segment is connected to one end of the second segment. The other end of the second segment is connected to the extension portion. The first segment extends in a direction from the first end toward the second end. In the direction from the first end toward the second end, the second segment is inclined in a direction away from the main board portion. At least a portion of the surface of the second segment toward the main board portion forms the stepped surface.

6. The stator assembly according to claim 1, characterized in that: The stator end plate is annular, and the second electrical connection portion and the third electrical connection portion extend in opposite directions along the circumference of the stator end plate and are in contact with the surface of the stator end plate.

7. The stator assembly according to claim 1, characterized in that: The connection terminal also includes two fixing parts connected to the main board, and the stator end plate also includes mounting parts corresponding to the fixing parts; the two fixing parts are spaced apart on opposite sides of the main board, and the two fixing parts are respectively corresponding to the second electrical connection part and the third electrical connection part; the stator end plate is provided with two spaced mounting parts, and the fixing parts are connected to the mounting parts in a corresponding manner.

8. The stator assembly according to claim 7, characterized in that: The two fixing parts extend obliquely away from each other in the first direction, and the fixing parts and the main board part form an angle α, satisfying: 120°≤α≤160°.

9. The stator assembly according to claim 7, characterized in that: The side of the fixing part is provided with continuously distributed helical teeth.

10. The stator assembly according to claim 7, characterized in that: The main board, the fixing part, and the electrical connection part are an integral component.

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