electric machine

Abstract

A motor includes a stator and a circuit board arranged at an axial side of the stator, the stator includes a stator core and a winding arranged on the stator core, the winding includes a wire and an insulation layer covering a surface of the wire, the circuit board is provided with a plurality of first pads located at an axial outer surface; the motor further includes a conductive terminal abutting against the first pads and a fastener fastening the conductive terminal to the first pads, the conductive terminal includes a base portion with a through hole, a pair of leg portions extending from longitudinal ends of the base portion, and a first piercing portion located at an inner side surface of the base portion and / or the leg portions, the fastener is arranged through the through hole to connect the conductive terminal to the first pads, and a terminal end of the winding is accommodated between the base portion and the leg portions; when the fastener is screwed or pressed, the leg portions are folded towards the base portion and clamp the terminal end of the winding, and the first piercing portion pierces the insulation layer of the wire. In this way, assembly time is saved, the motor is quickly and conveniently assembled, and welding and brazing are not required, so that the electrical connection of the winding is stable and reliable.

Description

[Technical Field]

[0001] This invention relates to the field of motor stator technology, and in particular to a motor that is quick to assemble and has a stable and reliable electrical connection. [Background Technology]

[0002] Electric motors are a vital power source in modern industry, widely used in various mechanical and electrical equipment. In most existing electric motors, the stator consists of a stator core and several sets of enameled wires wound around it. To achieve electrical connections between these sets of enameled wires, it is usually necessary to extend a section of the enameled wire outwards and then sequentially strip the enamel and solder them. This process is cumbersome, cannot be automated, and carries risks such as incomplete soldering or missed solder joints. Furthermore, under frequent overload conditions, the solder may melt.

[0003] To ensure a stable electrical connection between the various groups of enameled wires in the stator, please refer to Chinese Invention Patent CN103187809B, published on December 14, 2016. This patent discloses a motor comprising a stator and a circuit board fixed to one axial side of the stator. Conductive vias are provided on the circuit board. Each group of enameled wires in the stator has a starting end and an ending end, with adjacent starting and ending ends inserted into corresponding conductive vias and fixed by soldering. However, this connection method has low assembly efficiency and cannot fundamentally avoid the many defects of solder joints, resulting in insufficient product reliability.

[0004] Therefore, it is indeed necessary to provide an improved motor to overcome the shortcomings of the prior art. [Summary of the Invention]

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a motor that is quick to assemble and has a stable and reliable electrical connection.

[0006] The technical solution adopted by the present invention to solve the problem of the prior art is as follows: an electric motor, including a stator and a circuit board disposed on one axial side of the stator, the stator including a stator core and a winding wound on the stator core, the winding including a conductor and an insulating layer covering the surface of the conductor, the circuit board having a plurality of first pads located on the outer axial surface; the electric motor including conductive terminals abutting the first pads and fasteners for fastening the conductive terminals to the first pads, the conductive terminals including a base having a through hole, a pair of legs extending from both ends of the base longitudinally, and a first piercing portion located on the inner surface of the base and / or the legs, the fastener passing through the through hole to connect the conductive terminal to the first pad, the end of the winding being accommodated between the base and the legs; when the fastener is tightened or pressed in, the legs fold toward the base and clamp the end of the winding, the first piercing portion pierces the insulating layer so that the conductor is electrically connected to the first pad through the conductive terminal.

[0007] A further improvement is that the sum of the longitudinal lengths of the pair of legs is less than or equal to the longitudinal length of the base.

[0008] A further improvement is as follows: the circuit board has a first hole that penetrates the first pad along the axial direction, the through hole is aligned with the first hole to allow the fastener to pass through, a pair of legs are located between the base and the first pad, and the legs have a second piercing portion located on the outer surface, the second piercing portion abutting the surface of the first pad.

[0009] A further improvement is as follows: the circuit board has a first hole that penetrates the first pad along the axial direction, the through hole is aligned with the first hole to allow the fastener to pass through, the base is located between a pair of legs and the first pad, the base has a third piercing portion located on the outer surface, and the third piercing portion is attached to the surface of the first pad.

[0010] A further improvement is that the conductive terminal and the first pad are located on the axial side of the circuit board away from the stator.

[0011] A further improvement is as follows: the stator includes a first end plate fixedly connected to one axial side of the stator core. The first end plate is disposed adjacent to the circuit board and is provided with a fastener mounting part. The fastener is connected and fixed to the fastener mounting part.

[0012] A further improvement is as follows: the first pad is disposed on the axial side surface of the circuit board adjacent to the stator, and the conductive terminal is located between the circuit board and the stator, that is, one end of the conductive terminal abuts against the first pad and the other end abuts against the fastener mounting part.

[0013] A further improvement is that the first puncture portion consists of several parallel grooves, which extend perpendicularly to the end of the winding.

[0014] A further improvement is as follows: the base is provided with a first protrusion extending laterally, the leg is provided with a second protrusion extending laterally, the first protrusion and the second protrusion are disposed opposite to each other, and the end of the winding is accommodated between the first protrusion and the second protrusion.

[0015] A further improvement is as follows: the circuit board is provided with several second pads protruding from the axial outer surface, the second pads are electrically connected to the first pads, and the second pads are soldered to a lead wire.

[0016] Compared with the prior art, the present invention has the following advantages: the various windings of the stator are electrically connected through conductive terminals and fasteners; multiple processes such as pressing the lead-out end of the winding, fixing the conductive terminal, and piercing the insulation layer of the lead-out end can be achieved by tightening or pressing the fastener in one operation, saving assembly time and making assembly quick and convenient; the insulation layer of the winding is mechanically pierced by the conductive terminal, eliminating the need for fusion welding and brazing and without damaging the physical and chemical properties of the winding, making the electrical connection stable and reliable. Specifically, a circuit board is provided on one axial side of the stator, and the circuit board has several first pads located on the outer axial surface. The conductive terminal includes a base with a through hole, a pair of legs extending longitudinally from both ends of the base, and a first piercing portion located on the inner surface of the base and / or the legs. Fasteners pass through the through hole to connect the conductive terminal to the first pads. The end of the winding is accommodated between the base and the legs. When the fastener is tightened or pressed in, the legs fold towards the base and clamp the lead-out end of the winding. The first piercing portion pierces the insulation layer so that the lead-out end is electrically connected to the first pad through the conductive terminal. Further, to reduce the effort required for crimping the conductive terminal, the sum of the longitudinal lengths of the pair of legs is less than or equal to the longitudinal length of the base. In addition, to ensure a stable connection between the conductive terminal and the first pad, a second piercing portion can be provided on the outer surface of the leg where the conductive terminal abuts the first pad; or a third piercing portion can be provided on the outer surface of the base where the conductive terminal abuts the first pad. [Image Description]

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the motor structure according to a preferred embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A partially enlarged view of the motor shown;

[0020] Figure 3 yes Figure 1The diagram shown is an exploded view of the motor.

[0021] Figure 4 yes Figure 1 The front view of the circuit board of the motor shown;

[0022] Figure 5 yes Figure 1 A schematic diagram of the structure of the first end plate of the motor shown;

[0023] Figure 6 yes Figure 1 The diagram shows the structure of the conductive terminals of the motor.

[0024] Figure 7 yes Figure 6 A schematic diagram of the conductive terminal as viewed from another perspective;

[0025] Figure 8 yes Figure 6 The diagram shows a plan view of the conductive terminal before bending, revealing the inner surface of the conductive terminal.

[0026] Figure 9 yes Figure 6 The diagram shows a plan view of the conductive terminal before bending, revealing the outer surface of the conductive terminal.

[0027] Figure 10 yes Figure 1 The diagram shows a partial structure of the motor with the fasteners not tightened.

[0028] Figure 11 yes Figure 1 The diagram shows a partial structural schematic of the motor after the fasteners have been tightened.

[0029] Meaning of the reference numerals in the diagram:

[0030] Conductive terminal 1 Base 10

[0031] Through hole 100 first protrusion 101

[0032] First piercing part 102 Leg 11

[0033] Notch 110 Second protrusion 111

[0034] Second piercing part 112 Connecting part 12

[0035] Fastener 14 Circuit Board 2

[0036] First pad 21, first hole 210

[0037] Second pad 22, second hole 220

[0038] Wire slot 230, positioning hole 240

[0039] Anti-fouling hole 250 Stator 3

[0040] Stator core 30 First end plate 31

[0041] Fastener mounting part 310, positioning protrusion 340

[0042] Anti-foolproof protrusion 350, second end plate 32

[0043] Winding 33 Lead-out terminal 330

[0044] Lead wire 34, motor 500 [Detailed Implementation]

[0045] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0046] Please see Figures 1 to 3 As shown, this invention relates to a motor 500, which includes a stator 3 and a circuit board 2 disposed on one axial side of the stator 3. The stator 3 includes a stator core 30 and windings 33 wound on the stator core 30. The windings 33 include conductors and an insulating layer covering the surface of the conductors. Preferably, the windings 33 are formed by winding multiple sets of enameled wires around the stator core 30, and each set of windings 33 has two leads 330. The specific number of turns and winding method of the windings 33 are not the focus of this invention, and therefore will not be described in detail or limited.

[0047] Please combine Figure 4 As shown, the circuit board 2 is generally circular and its diameter is approximately equal to the outer diameter of the stator 3. The circuit board 2 has several first pads 21 located on its axial outer surface; preferably, the first pads 21 are semi-elliptical solder pads that axially protrude from the surface of the circuit board 2; in this embodiment, three first pads 21 are evenly distributed circumferentially on the circuit board 2, and a first hole 210 for the fastener 14 to pass through is provided in the middle of each first pad 21. In another embodiment of the invention, the first hole 210 may not be provided on the first pad 21 but may be provided adjacent to the first pad 21.

[0048] Optionally, the circuit board 2 also has several second pads 22 protruding from its axial outer surface. The second pads 22 are electrically connected to the first pads 21, and are soldered to a lead wire 34. In this embodiment, since the motor 500 is a brushless motor, the circuit board 2 has three second pads 22 for connecting the U, V, and W phase power supplies, respectively. To strengthen the connection between the second pads 22 and the lead wire 34, each second pad 22 has a second hole 220. These second holes 220 not only provide a passage for the lead wire 34 to pass through, but also provide stable support for the soldering process. Furthermore, to ensure stable operation of the circuit board 2 under various environmental conditions, its material selection and structural design are also crucial considerations. The circuit board 2 is typically made of materials with high rigidity and low coefficient of thermal expansion, such as FR4 or CEM-1. The selection of these materials helps reduce deformation or warping caused by temperature changes, thereby ensuring the stability of the circuit board 2 during long-term operation.

[0049] In order to secure the lead-out end 330 of the winding 33, two wire-locking grooves 230 are provided on both sides of each first pad 21. The wire-locking grooves 230 are preferably narrow "L"-shaped grooves located on the outer edge of the circuit board 2.

[0050] In other embodiments of the present invention, the design of circuit board 2 is highly flexible and adaptable. Depending on the actual application requirements, circuit board 2 can be designed in various shapes and sizes to meet specific installation and layout requirements. For example, it can be rectangular, circular, irregularly shaped, etc., and its size can be adjusted according to the size of the motor and the required functions; this flexibility allows circuit board 2 to adapt to various brushless motor devices. In addition to the variability in shape and size, various electronic components can be integrated on circuit board 2 to enhance its functionality and performance. These electronic components may include, for example, Hall effect sensors, resistors, capacitors, transistors, etc., for signal processing, current regulation, protection, and other functions. By rationally selecting and arranging these electronic components, the performance and stability of the brushless motor device can be further optimized. Furthermore, circuit board 2 can utilize a PCB (Printed Circuit Board), which is well-known to those skilled in the art. A PCB is a substrate widely used in electronic devices, on which conductive lines and components can be printed to realize the transmission and connection of electrical signals. By using a PCB, circuit design and assembly processes can be simplified, production efficiency improved, and the reliability and stability of circuit board 2 ensured.

[0051] In the design of stator 3, its key components include a first end plate 31 and a second end plate 32 fixedly connected to both axial sides of stator core 30. For clarity, the end plate adjacent to circuit board 2 is defined as the first end plate 31, and the end plate farther from circuit board 2 is defined as the second end plate 32. For the material selection of the first end plate 31 and the second end plate 32, it is preferably made of injection-molded plastic with good insulation properties; the plastic injection molding process gives the end plates high structural strength and durability, enabling them to withstand vibrations and impacts during the operation of motor 500.

[0052] Please combine Figure 5 As shown, the first end plate 31 has a fastener mounting portion 310 for mounting the fastener 14. Several (three in this embodiment) square positioning holes 240 are formed on the circuit board 2; the first end plate 31 has a positioning protrusion 340 for engaging the positioning holes 240. To facilitate correct assembly of the circuit board 2 onto the first end plate 31, a circular anti-foolproof hole 250 is formed on the circuit board 2, and an anti-foolproof protrusion 350 for engaging the anti-foolproof hole 250 is formed on the first end plate 31; the circuit board 2 can only be correctly installed when the anti-foolproof protrusion 350 is installed into the anti-foolproof hole 250 and the corresponding positioning protrusion 340 is installed into the corresponding positioning hole 240.

[0053] It is worth noting that in another embodiment of the present invention, it is also feasible to provide only the first end plate 31. This design choice is mainly based on specific application requirements and technical specifications. In some specific cases, only one end plate may be needed to meet functional requirements, and omitting the second end plate 32 can simplify the manufacturing process and reduce costs. However, the first end plate 31 and the second end plate 32 are usually provided simultaneously to provide better structural stability and functionality.

[0054] Please combine Figures 6 to 9 As shown, the leads 330 of several windings 33 are electrically connected to the first pad 21 via conductive terminals 1 and fasteners 14. Specifically, the conductive terminal 1 includes a base 10, a pair of legs 11 extending from both ends of the base 10 longitudinally, and a connecting portion 12 connecting the base 10 and the legs 11; a through hole 100 is provided through the base 10, and a first piercing portion 102 is provided on the inner surface of the base 10 and / or the legs 11. When assembling the motor 500, the leads 330 of the windings 33 need to be accommodated between the base 10 and the legs 11 first, and then the fasteners 14 are inserted through the through hole 100 to connect the conductive terminals 1 to the first pad 21. When the fastener 14 is tightened or pressed in, the leg 11 folds toward the base 10 and clamps the lead-out end 330 of the winding 33. The first piercing part 102 pierces the insulation layer so that the lead-out end 330 is electrically connected to the first pad 21 through the conductive terminal 1. The conductive terminal 1 is preferably made of copper sheet with good conductivity by punching and bending sheet metal.

[0055] The structure of fastener 14 is crucial to the assembly process and performance of motor 500. Fastener 14 generally needs to meet certain mechanical performance requirements, such as sufficient strength and wear resistance, to ensure stability during tightening or pressing and to withstand repeated use without damage. Furthermore, fastener 14 needs to have certain dimensional accuracy and tolerance ranges to ensure accurate fixation of conductive terminal 1 and first pad 21. In specific implementations, fastener 14 can adopt various structural forms, such as screws, nuts, bolts, rivets, etc. Fastener 14 can fix conductive terminal 1 and first pad 21 in various ways, such as thread tightening, riveting, pressing, etc. Regardless of the structural form or fixing method used, the main function of fastener 14 is to stably press and fix conductive terminal 1 to first pad 21, thereby ensuring a stable and reliable electrical connection between conductive terminal 1 and first pad 21.

[0056] In this embodiment, two adjacent leads 330 are respectively snapped onto both sides of the fastener 14; in another embodiment of the present invention, the conductive terminal 1 can realize electrical connection of more than two leads 330; in another embodiment of the present invention, multiple leads 330 can be disposed on one side of the fastener 14.

[0057] Preferably, the first piercing portion 102 is a plurality of parallel grooves, and the grooves extend perpendicularly to the lead-out end 330 of the winding 33. In another embodiment of the present invention, the first piercing portion 102 is a plurality of parallel protrusions, and the protrusions extend perpendicularly to the lead-out end 330 of the winding 33. In order to achieve a stable electrical connection, the first piercing portion 102 needs to have a certain degree of hardness and sharpness to ensure that it can successfully pierce the insulation layer; at the same time, the first piercing portion 102 also needs to have a certain degree of wear resistance and corrosion resistance to meet the requirements of repeated assembly and use.

[0058] In this embodiment, the first piercing portion 102 is provided on the inner side of the conductive terminal 1, and extends longitudinally sequentially through the inner side of one leg 11, the inner side of the base 10, and the inner side of the other leg 11. In another embodiment of the present invention, the first piercing portion 102 is provided only on the inner surface of the base 10. In another embodiment of the present invention, the first piercing portion 102 is provided only on the inner surface of one or both legs 11.

[0059] To reduce the effort required for crimping the conductive terminal 1, the sum of the longitudinal lengths of the two legs 11 is preferably less than or equal to the longitudinal length of the base 10. Notches 110 are also provided at the extended ends of the two legs 11, and these notches 110 are arranged opposite each other to accommodate the fastener 14.

[0060] Please combine Figure 10 and Figure 11 As shown, in this embodiment, the circuit board 2 is provided with a first hole 210 that penetrates the first pad 21 along the axial direction. The through hole 100 of the base 10 is aligned with the first hole 210 for the fastener 14 to pass through. A pair of legs 11 are located between the base 10 and the first pad 21. The legs 11 are provided with a second piercing part 112 located on the outer surface. The second piercing part 112 is used to abut against and pierce the surface of the first pad 21.

[0061] Preferably, the second piercing portion 112 is a plurality of parallel grooves, and the grooves extend perpendicularly to the lead-out end 330 of the winding 33. In another embodiment of the present invention, the second piercing portion 112 is a plurality of parallel protrusions, and the protrusions extend perpendicularly to the lead-out end 330 of the winding 33. In order to achieve a stable electrical connection, the second piercing portion 112 needs to have a certain degree of hardness and sharpness to ensure that it can successfully pierce the insulation layer; at the same time, the second piercing portion 112 also needs to have a certain degree of wear resistance and corrosion resistance to meet the requirements of repeated assembly and use.

[0062] The working principle of the first piercing part 102 and the second piercing part 112 is as follows: During the tightening process of the fastener 14, the opening surface of the conductive terminal 1 deforms first. The second piercing part 112 located on the outer surface of the leg 11 partially contacts the first pad 21 of the circuit board 2. As the fastener 14 descends, it pushes the conductive terminal 1 down, and the serrations of the second piercing part 112 insert into the interior of the first pad 21. As the contact area increases, the deformation of the opening surface of the conductive terminal 1 decreases. With the continuous tightening of the fastener 14, the entire conductive terminal 1 is subjected to force and deforms. The first piercing part 102 on the inner surface squeezes the lead-out end 330 of the winding 33 and pierces the outer insulation layer of the lead-out end 330 until the contact area between the first piercing part 102 and the lead-out end 330 increases to the limit. At this time, because the contact area is large, the tightening force of the fastener 14 remains unchanged. The resistance of the conductive terminal 1 to deformation and the tightening force of the fastener 14 cancel each other out, and the conductive terminal 1 stops deforming. The open surface of the conductive terminal 1 contacts the first pad 21 of the circuit board 2 and is tightened by the fastener 14, making the contact stable and the motor 500 can cope with a variety of harsh working conditions.

[0063] In another embodiment of the invention, Figure 10The conductive terminal 1 is inverted, such that the base 10 is located between a pair of legs 11 and the first pad 21. A third piercing portion (not shown) is provided on the outer surface of the base 10, which is used to abut and pierce the surface of the first pad 21. Preferably, the third piercing portion (not shown) is a plurality of parallel grooves extending perpendicularly to the lead-out end 330 of the winding 33. In another embodiment of the invention, the third piercing portion (not shown) is a plurality of parallel protrusions extending perpendicularly to the lead-out end 330 of the winding 33. To achieve a stable electrical connection, the third piercing portion (not shown) needs to have a certain degree of hardness and sharpness to ensure successful piercing of the insulation layer; simultaneously, the third piercing portion (not shown) also needs to have a certain degree of wear resistance and corrosion resistance to meet the requirements of repeated assembly and use.

[0064] In this embodiment, the conductive terminal 1 and the first pad 21 are located on the axial side of the circuit board 2 away from the stator 3, that is, one end of the conductive terminal 1 abuts against the first pad 21 and the other end abuts against the head of the fastener 14.

[0065] In another embodiment of the present invention, the first pad 21 is disposed on the axial side surface of the circuit board 2 adjacent to the stator 3, and the conductive terminal 1 is located between the circuit board 2 and the stator 3, that is, one end of the conductive terminal 1 abuts against the first pad 21 and the other end abuts against the fastener mounting part 310 of the first end plate 31.

[0066] Optionally, in order to better clamp and fix the lead end 330 of the winding 33, the base 10 is provided with a first protrusion 101 extending laterally, and the leg 11 is provided with a second protrusion 111 extending laterally; the first protrusion 101 and the second protrusion 111 are arranged opposite to each other, and the lead end 330 of the winding 33 is accommodated between the first protrusion 101 and the second protrusion 111.

[0067] In this embodiment, motor 500 is an internal rotor brushless motor. The solution of this invention is also applicable to other types of motors with windings wound in the stator core, such as DC motors, AC motors, stepper motors, servo motors, etc., which are well known to those skilled in the art. DC motors are widely used in applications requiring DC operation, such as power tools and electric vehicles. AC motors are also widely used in many fields, such as industrial motors and household appliances. Stepper motors and servo motors are typically used in high-precision control applications, such as CNC machine tools and automated production lines.

[0068] In this invention, the windings 33 of the stator 3 are electrically connected to each other through conductive terminals 1 and fasteners 14. By tightening or pressing the fasteners 14 once, multiple processes such as pressing the lead-out end 330 of the winding 33, fixing the conductive terminals 1, and piercing the insulation layer of the lead-out end 330 can be achieved, saving assembly time and making assembly quick and convenient. By mechanically piercing the insulation layer of the winding 33 through the conductive terminals 1, there is no need for fusion welding and brazing, and the physical and chemical properties of the winding 33 are not damaged, making the electrical connection stable and reliable. Specifically, a circuit board 2 is provided on one axial side of the stator 3, and the circuit board 2 has several first pads 21 located on the outer axial surface; the conductive terminal 1 includes a base 10 with a through hole 100, a pair of legs 11 extending from both ends of the base 10 longitudinally, and a first piercing portion 102 located on the inner surface of the base 10 and / or the legs 11. A fastener 14 passes through the through hole 100 to connect the conductive terminal 1 to the first pad 21, and the end of the winding 33 is accommodated between the base 10 and the legs 11; when the fastener 14 is tightened or pressed in, the legs 11 fold toward the base 10 and clamp the lead-out end 330 of the winding 33, and the first piercing portion 102 pierces the insulating layer so that the lead-out end 330 is electrically connected to the first pad 21 through the conductive terminal 1. Further, in order to make the conductive terminal 1 less forceful during crimping, the sum of the longitudinal lengths of the pair of legs 11 is less than or equal to the longitudinal length of the base 10. In addition, in order to ensure a stable connection between the conductive terminal 1 and the first pad 21, a second piercing portion 112 may be provided on the outer surface of the leg 11 where the conductive terminal 1 and the first pad 21 are in contact; or a third piercing portion (not shown) may be provided on the outer surface of the base 10 where the conductive terminal 1 and the first pad 21 are in contact.

[0069] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions for the motor of this invention exist without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. An electric motor, comprising a stator and a circuit board disposed on one axial side of the stator, the stator comprising a stator core and a winding wound on the stator core, the winding comprising a conductor and an insulating layer covering the surface of the conductor, the circuit board having a plurality of first pads located on the outer axial surface; characterized in that: The motor includes a conductive terminal abutting the first pad and a fastener for securing the conductive terminal to the first pad. The conductive terminal includes a base with a through hole, a pair of legs extending longitudinally from both ends of the base, and a first piercing portion located on the inner surface of the base and / or the legs. The fastener passes through the through hole to connect the conductive terminal to the first pad. The end of the winding is accommodated between the base and the legs. When the fastener is tightened or pressed in, the legs fold toward the base and clamp the end of the winding. The first piercing portion pierces the insulation layer to allow the wire to be electrically connected to the first pad through the conductive terminal.

2. The motor according to claim 1, characterized in that: The sum of the longitudinal lengths of the pair of legs is less than or equal to the longitudinal length of the base.

3. The motor according to claim 1, characterized in that: The circuit board has a first hole that extends axially through the first pad. The through hole is aligned with the first hole to allow the fastener to pass through. A pair of legs are located between the base and the first pad. Each leg has a second puncture portion located on its outer surface, and the second puncture portion is attached to the surface of the first pad.

4. The motor according to claim 1, characterized in that: The circuit board has a first hole that extends axially through the first pad. The through hole is aligned with the first hole to allow the fastener to pass through. The base is located between a pair of legs and the first pad. The base has a third piercing portion located on the outer surface, which is attached to the surface of the first pad.

5. The motor according to any one of claims 1 to 4, characterized in that: The conductive terminal and the first pad are located on the axial side of the circuit board away from the stator.

6. The motor according to any one of claims 1 to 4, characterized in that: The stator includes a first end plate fixedly connected to one axial side of the stator core. The first end plate is disposed adjacent to the circuit board and is provided with a fastener mounting part. The fastener is connected and fixed to the fastener mounting part.

7. The motor according to claim 6, characterized in that: The first pad is disposed on the axial side surface of the circuit board adjacent to the stator, and the conductive terminal is located between the circuit board and the stator, that is, one end of the conductive terminal abuts against the first pad and the other end abuts against the fastener mounting part.

8. The motor according to claim 1, characterized in that: The first puncture portion consists of several parallel grooves that extend perpendicularly to the end of the winding.

9. The motor according to claim 1, characterized in that: The base has a first protrusion extending laterally, the leg has a second protrusion extending laterally, the first protrusion and the second protrusion are disposed opposite to each other, and the end of the winding is accommodated between the first protrusion and the second protrusion.

10. The motor according to claim 1, characterized in that: The circuit board has several second pads protruding from its axial outer surface. The second pads are electrically connected to the first pads and are soldered to a lead wire.

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