Stator, axial flux motor and application thereof

Abstract

Provided in the embodiments of the present application are a stator, an axial flux motor and the application thereof. The stator comprises a first circuit board and a second circuit board surface-mounted on the first circuit board, wherein the first circuit board is electrically connected to the second circuit board; the first circuit board comprises a first substrate and an induction coil printed on the first substrate, and the second circuit board comprises a second substrate and a driving circuit disposed on the second substrate; and the driving circuit is used for providing a current to the induction coil, and the driving circuit is located outside the boundary of the orthographic projection of the first circuit board onto the second circuit board. The stator enables fully automated production, features high assembly precision and high product yield, and allows for miniaturization and lightweight design, thereby facilitating the application of axial flux motors in compact scenarios.

Description

Stator, axial flux motor and application

[0001] The present application claims priority to the Chinese patent application No. 202410869482.8, filed on June 29, 2024, entitled "Stator, axial flux motor and application", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the motor technology field, in particular to a stator, an axial flux motor and application. BACKGROUND

[0003] In recent years, with the increasing demand for space limitation and torque density of mechanical products such as fans, hard disks and robot joints in application scenarios, axial flux motors have attracted more and more attention due to their compact axial length, high power density and torque density. Especially in small size application scenarios such as micro fans, the space occupied by the enameled wire winding of the traditional motor is large, and the coil pin needs to be welded on the circuit board manually, which has many problems such as low production efficiency and low yield. SUMMARY

[0004] In view of this, embodiments of the present application provide a stator, an axial flux motor and application. The stator can realize full automation production, has high assembly precision and high product yield, and can realize the lightness and thinness of the stator, which is beneficial to the application of the axial flux motor in small size scenarios.

[0005] A first aspect of embodiments of the present application provides a stator, comprising a first circuit board and a second circuit board surface-mounted on the first circuit board, the first circuit board and the second circuit board are electrically connected;

[0006] The first circuit board comprises a first substrate and an induction coil printed on the first substrate, and the second circuit board comprises a second substrate and a driving circuit arranged on the second substrate; the driving circuit is located outside the boundary of the first circuit board in the orthographic projection of the second circuit board, and the driving circuit is configured to provide current to the induction coil.

[0007] The stator provided by the embodiment of the present application has the induction coil printed on the first circuit board, which can not only realize the one-piece forming of the first circuit board, but also can significantly reduce the thickness and weight of the first circuit board. Therefore, the stator provided by the embodiment of the present application does not have the problem that the enameled wire patch assembly needs to be manually welded on the substrate in the related art, and thus the problems of uneven coil arrangement and low assembly precision caused by manual welding can be avoided. Meanwhile, the axial dimension of the stator can be reduced. The surface of the second circuit board is surface-mounted on the first circuit board to realize the electrical connection, and the full-automatic production of the stator can be realized, the assembly precision of the stator is further improved, and the application of the stator in the motor is facilitated. In addition, the driving circuit is located outside the boundary of the orthographic projection of the first circuit board on the second circuit board, and more axial space can be released, and the thickness of the stator is further reduced, so that an axial flux motor with a smaller axial dimension can be provided.

[0008] In some embodiments of the present application, the first substrate has a plurality of power supply electrodes on the side surface close to the second circuit board, and the second substrate has a plurality of first pads corresponding to the plurality of power supply electrodes on the side surface close to the first circuit board.

[0009] The first pads and the power supply electrodes are welded to realize the electrical connection between the first circuit board and the second circuit board.

[0010] In some embodiments of the present application, the first substrate includes a plurality of wiring boards stacked in a first direction, each of the wiring boards has a coil layer printed thereon, the coil layers on any two adjacent wiring boards are electrically connected through the through holes in the wiring boards, and the plurality of coil layers are sequentially connected to form the induction coil. The first direction is the stacking direction of the first circuit board and the second circuit board. In this way, the output capacity and the higher efficiency of the final motor can be effectively improved.

[0011] In some embodiments of the present application, each coil layer includes a plurality of phase windings, each phase winding includes a plurality of phase units uniformly and spacedly arranged, and the phase units of the same phase are electrically connected. The phase units of the same phase of any two adjacent coil layers are electrically connected.

[0012] In some embodiments of the present application, the first substrate further has at least one second pad on the side surface close to the second circuit board, the second substrate has a third pad corresponding to the second pad on the side surface close to the first circuit board, and the second pad and the third pad are welded. The welded second pad and third pad can enhance the bonding force between the first circuit board and the second circuit board, improve the structural stability of the stator, and facilitate the improvement of the service life of the motor.

[0013] In some embodiments of the present application, the driving circuit includes circuit wiring printed on the second substrate, and electronic components electrically connected to the circuit wiring.

[0014] The second aspect of the embodiments of the present application provides an axial flux motor, which includes the stator provided by the first aspect of the embodiments of the present application and a rotor penetrating the stator. Since the stator provided by the embodiments of the present application is adopted, the axial dimension of the axial flux motor is smaller than that of the related art, and the market prospect of the axial flux motor is better.

[0015] In some embodiments of the present application, the rotor includes a rotor shell and an axial flux sheet arranged in axial cooperation;

[0016] The axial flux sheet includes N-pole magnets and S-pole magnets arranged alternately;

[0017] The rotor shell includes a rotating shaft, which penetrates the axial flux sheet, the first circuit board and the second circuit board in sequence.

[0018] In some embodiments of the present application, a base is further included, which is arranged in nesting with the stator and the rotor, and includes a middle tube for accommodating the rotating shaft to fix the rotor and the stator.

[0019] The third aspect of the embodiments of the present application provides a fan, which includes the axial flux motor provided by the second aspect of the embodiments of the present application and an air outlet assembly, and the air outlet assembly includes blades formed on the outer periphery of the rotor.

[0020] The rotor, the stator and the base are arranged in nesting in sequence, and an annular accommodation space is formed between the base and the stator;

[0021] The blades are located at least partially in the annular accommodation space.

[0022] Since the axial flux motor provided by the embodiments of the present application is adopted, the outer periphery space of the stator of the axial flux motor can be released to the blades, so the blades can extend from the outer periphery of the rotor to the outer periphery of the stator, that is, at least part of the blades is located in the annular accommodation space formed between the base and the stator. In this way, the space utilization of the fan can be effectively improved.

[0023] The fourth aspect of the embodiments of the present application provides a terminal device, which comprises the fan provided by the third aspect of the embodiments of the present application, or comprises the axial flux motor provided by the second aspect of the embodiments of the present application. In the embodiments of the present application, the fan is used for dissipating heat for components in the terminal device, and the fan can be arranged in cooperation with a high-heat component in the terminal device. The fan provided by the embodiments of the present application can release more internal space of the terminal device, and can further reduce the volume of the terminal device, or release the internal space to other components to improve the performance of the terminal device, so that the market competitiveness of the terminal device can be improved.

[0024] The fifth aspect of the embodiments of the present application provides a robot joint, which comprises the axial flux motor provided by the fifth aspect of the embodiments of the present application. Since the axial flux motor provided by the embodiments of the present application has a smaller axial dimension than related art, the robot joint has better market competitiveness.

[0025] The sixth aspect of the embodiments of the present application provides a robot, which comprises the robot joint provided by the fifth aspect of the embodiments of the present application. Since the robot joint provided by the embodiments of the present application is adopted, the robot has better market prospects. BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is an exploded view of a stator provided by an embodiment of the present application;

[0027] FIG. 2A is a top view of a first circuit board provided by an embodiment of the present application;

[0028] FIG. 2B is a bottom view of the first circuit board provided by an embodiment of the present application;

[0029] FIG. 3 is a top view of a second circuit board provided by an embodiment of the present application;

[0030] FIG. 4A is an exploded view of an axial flux motor provided by an embodiment of the present application;

[0031] FIG. 4B is a sectional view of the axial flux motor provided by an embodiment of the present application;

[0032] FIG. 5A is a perspective view of a fan provided by an embodiment of the present application from one viewing angle;

[0033] FIG. 5B is a sectional view of the fan in FIG. 5A. DETAILED DESCRIPTION

[0034] A magnetic flux motor can control the strength and direction of the magnetic field of the induction coil by changing the direction and size of the current in the induction coil in the rotor, and because the magnetic poles of the stator are fixed, when the direction and strength of the magnetic field of the rotor changes, the magnetic field interacts to generate a Lorentz force, thereby driving the rotor to rotate. The magnetic poles of the axial flux motor are arranged along the axial direction, and the magnetic flux passes through the central axis of the rotor. When the induction coil of the stator has a current passing through it, the magnetic field generated by the current can pass through the rotor along the above-mentioned axial direction, generating a torque in the rotor and thereby driving the rotor to rotate. The drive circuit can provide current to the induction coil and control the size and direction of the current.

[0035] The axial flux motor has relatively small volume and weight, and is suitable for application in small size scenarios. However, in the related art, the stator of the axial flux motor generally still uses a traditional enameled wire winding. The volume of the enameled wire winding is relatively large, and its preparation requires welding the coil pins of the coil assembly on the circuit board, which cannot realize full automation of the production of the stator, and the assembly precision is difficult to guarantee. The process is complex, the production efficiency is low, the yield is low, and it is not conducive to the popularization and application of the axial flux motor. Although it is reported in the related art that a printed circuit board is used to replace the traditional enameled wire winding circuit board, the structure design of the stator in the related art is limited in reducing the axial size of the axial flux motor.

[0036] To solve the above technical problems, please refer to FIGS. 1-3, the embodiments of the present application provide a stator 1, comprising a first circuit board 10 and a second circuit board 20 surface mounted on the first circuit board 10, the first circuit board 10 and the second circuit board 20 are electrically connected; it can be understood that, since the second circuit board 20 is surface mounted on the first circuit board 10, the first circuit board 10 and the second circuit board 20 are stacked;

[0037] The first circuit board 10 comprises a first substrate 101 and an induction coil 102 printed on the first substrate 101, and the second circuit board 20 comprises a second substrate 201 and a drive circuit 202 provided on the second substrate 201, the drive circuit 202 is used to provide current to the induction coil; the drive circuit 202 is located outside the boundary of the orthographic projection of the first circuit board 10 on the second circuit board 20. Specifically, the drive circuit 202 is located outside the boundary of the orthographic projection of the first circuit board 10 on the second circuit board 20, for example, the drive circuit 202 can be arranged in the area outside the orthographic projection of the first circuit board 10 on the second circuit board 20.

[0038] Surface Mounted Technology (SMT) is also known as electronic circuit surface assembly technology, which can install a pinless or short lead surface assembly component on the surface of a printed circuit board (PCB) or the surface of other substrates, and is a circuit connection technology welded and assembled by reflow soldering or immersion soldering.

[0039] The above stator 1 provided by the embodiments of the present application has the induction coil 102 printed on the first substrate 101, which can not only realize the one-piece forming of the first circuit board 10, but also significantly reduce the thickness and weight of the first circuit board 10; thus, the stator 1 provided by the embodiments of the present application does not have the problem of manually welding the enameled wire patch assembly on the substrate in the related art, and can avoid the problems of uneven coil arrangement and low assembly precision caused by manual welding; at the same time, the axial dimension of the stator 1 can also be reduced. The first circuit board 10 is attached to the second circuit board 20 via SMT to realize electrical connection, which can realize the full automation of the stator and further improve the assembly precision of the stator, which is beneficial to the application of the stator in the motor. In addition, the driving circuit 202 is located outside the boundary of the orthographic projection of the first circuit board 10 on the second circuit board 20, which can release more axial space and further reduce the thickness of the stator 1, so as to provide an axial flux motor with a smaller axial dimension. When the above axial flux motor is applied in components such as fans, the space utilization of the fan can be effectively improved, for example, the blade assembly of the fan can be extended to the outer periphery of the stator 1, which is more beneficial to the miniaturization of the fan and other components.

[0040] When the above stator 1 is applied in an axial flux motor, in order to realize the assembly of the stator 1 and the rotor, in some embodiments of the present application, the first substrate 101 further has a first through hole 105, the second substrate 201 further has a second through hole 205, and the first through hole 105 and the second through hole 205 are correspondingly arranged. In some specific embodiments, the first through hole 105 is arranged at the center of the first substrate 101, and the second through hole 205 is arranged at the center of the second substrate 201.

[0041] In some embodiments of the present application, the material of the induction coil 102 includes but is not limited to one or more of copper, silver, etc.

[0042] In some embodiments of the present application, the material of the first substrate 101 can be any material known in the art of PCB that is suitable for the substrate. In some embodiments of the present application, the material of the first substrate 101 includes, but is not limited to, an insulating resin. In some specific embodiments, the material of the first substrate 101 is a glass fiber reinforced insulating resin, which can improve the mechanical properties of the first circuit board 10 and the service life of the stator 1. The insulating resin includes, but is not limited to, one or more of epoxy resin, polyimide, polytetrafluoroethylene, and phenolic resin.

[0043] In some embodiments of the present application, the first substrate 101 includes a plurality of wiring boards (not shown in the figures) stacked in a first direction, each of which has a coil layer printed thereon, and any two adjacent coil layers are electrically connected through a through hole (not shown in the figures) in the wiring board. The plurality of coil layers are sequentially connected to form the induction coil 102. The first direction is the stacking direction of the first circuit board 10 and the second circuit board 20. In this way, the first circuit board 10 has a plurality of stacked coil layers, which can effectively improve the output capacity of the final motor and achieve higher efficiency. In some embodiments of the present application, the through hole can be a blind hole, a through hole, a buried hole, etc., which can effectively reduce the coil winding space occupied by the electrical connection of the coil layers and improve the torque density. In some embodiments, the through hole is formed of the material of the induction coil 102. In some embodiments of the present application, the number of coil layers can be 2-10, or more than 10, such as 11-15, etc. Of course, in some specific embodiments, the induction coil 102 has only one coil layer. It should be noted that in the first direction, any two adjacent coil layers are separated by an insulating layer (not shown in the figures). The material of the insulating layer can be the material of the first substrate 101. In some specific embodiments, the induction coil 102 includes a plurality of metal coil layers stacked in the first direction, and any two adjacent metal coil layers are separated by an insulating layer. In some embodiments of the present application, when the induction coil 102 includes a plurality of coil layers, at least part of the coil layers are embedded in the first substrate 101; in other words, the first circuit board 10 is laminated by a plurality of wiring boards with coil layers printed thereon.

[0044] In some embodiments of the present application, each coil layer includes a multi-phase winding, each phase winding includes a plurality of uniform and spaced phase units, and the phase units of the same phase are electrically connected. That is, the induction coil 102 is a multi-phase winding induction coil. In some specific embodiments, the first substrate 101 includes a first through hole 105, and the plurality of phase units in each phase winding are uniformly and spacedly arranged along the circumference of the first through hole 105. Specifically, for example, the coil layer includes 2 U-phase phase units, 2 V-phase phase units, and 2 W-phase phase units, which are uniformly arranged along the circumference of the first through hole 105 in the order of U-phase phase unit, V-phase phase unit, W-phase phase unit, U-phase phase unit, V-phase phase unit, and W-phase phase unit.

[0045] Of course, in some embodiments, each coil layer can be a single-phase winding, which can be determined by the actual production situation of those skilled in the art. In the embodiments of the present application, the induction coil 102 can be a three-phase coil or more than a three-phase coil. For example, the induction coil 102 has U-phase, V-phase, and W-phase. In the embodiments of the present application, the electrical connection relationship between the multi-phase windings can be determined according to the actual use. For example, when the induction coil 102 is a three-phase coil, the connection method between the windings can be star connection or delta connection.

[0046] In some specific embodiments, the induction coil 102 includes a plurality of coil layers stacked along the first direction, and each coil layer includes a multi-phase winding. It can be understood that, at this time, the phase units of any adjacent coil layers are electrically connected. For example, the U-phase coils of the plurality of coil layers are electrically connected layer by layer, the V-phase coils of the plurality of coil layers are electrically connected layer by layer, and the W-phase coil layers of the plurality of coil layers are electrically connected layer by layer.

[0047] In some embodiments of the present application, as shown in FIG. 2A, each phase unit is a patterned coil, and the material of the patterned coil is metal; the metal includes copper and / or silver. It should be noted that FIG. 2A is only an exemplary drawing, and the coil pattern, line width, and other features in FIG. 2A do not limit the embodiments of the present application.

[0048] In the embodiments of the present application, the arrangement of the coil pattern in the coil layer is not limited and can be determined according to the actual production situation. In some embodiments, the phase unit includes one coil pattern, and the coil pattern is patterned in a spiral shape in the form of forming a plurality of turning shapes. The coil patterns of the phase units of the plurality of coil layers can be the same or different; in a single coil layer, the coil patterns of the plurality of different phase units can also be the same or different. When a single phase unit includes a plurality of coil patterns, the plurality of coil patterns can be the same or different. In the embodiments of the present application, the number of coil turns in a single coil pattern is not limited and can be determined by those skilled in the art according to the actual production situation.

[0049] In some embodiments of the present application, referring to FIG. 3, the driving circuit 202 includes circuit traces 202a printed on the second substrate 201, and electronic components 202b electrically connected to the circuit traces 202a. The material of the circuit traces 202a includes, but is not limited to, one or more of copper, silver, etc. In some embodiments of the present application, the electronic components 202b include, but are not limited to, motor driving chips, inductors, etc. In the embodiments of the present application, the legends are exemplary, and the positions, shapes, and sizes of the circuit traces 202a and the electronic components 202b in the figures do not limit the present application. It can be understood that the driving circuit 202 is located outside the boundary of the orthographic projection of the first circuit board 10 on the second circuit board 20, and therefore, the electronic components 202b are also located outside the boundary of the orthographic projection of the first circuit board 10 on the second circuit board 20.

[0050] In the embodiments of the present application, the specific design of the driving circuit 202 is not limited. In order to realize the connection with the external power supply, the driving circuit 202 includes power terminals for connecting with the external power supply, etc.

[0051] In some embodiments of the present application, the second substrate 201 includes a bearing portion and an extension portion, and the orthographic projection of the first circuit board 10 on the second substrate 201 is located in the bearing portion. In some specific embodiments, the driving circuit 202 is arranged in the bearing portion. In other specific embodiments, the driving circuit 202 is arranged in the extension portion. In still other embodiments, the circuit traces 202a are printed on the extension portion, and part or all of the electronic components 202b are arranged on the bearing portion, and the electronic components 202b on the bearing portion are electrically connected to the circuit traces 202a through metal wires (not shown in the figures). Specifically, the metal wires can be printed on the second substrate 201, or can be embedded in the second substrate 201.

[0052] In some embodiments of the present application, the material of the second substrate 201 includes, but is not limited to, insulating resin. In some specific embodiments, the material of the second substrate 201 is glass fiber reinforced insulating resin. The insulating resin includes, but is not limited to, one or more of epoxy resin, polyimide, polytetrafluoroethylene, and phenolic resin.

[0053] In some embodiments of the present application, referring to FIG. 2B, the first substrate 101 (i.e., the first circuit board 10) has a plurality of power supply electrodes 103 on the side surface close to the second circuit board 20; referring to FIG. 3, the second substrate 201 (i.e., the second circuit board 20) has a plurality of first pads 203 corresponding to the plurality of power supply electrodes 103 on the side surface close to the first circuit board 10; the corresponding first pads 203 and power supply electrodes 103 are soldered to realize the electrical connection between the first circuit board 10 and the second circuit board 20. It can be understood that the power supply electrodes 103 are the power supply electrodes 103 of the induction coil 102, the first pads 203 are electrically connected to the driving circuit 202, and the first pads 203 and the power supply electrodes 103 are soldered to realize the electrical connection between the induction coil 102 and the driving circuit 202. In some specific embodiments, the second substrate 201 has an interconnection structure, and the first pads 203 and the driving circuit 202 are electrically connected through the interconnection structure. In other specific embodiments, the surface of the second substrate 201 is printed with metal wiring (not shown in the figures), and the first pads 203 and the driving circuit 202 are electrically connected through the metal wiring. It should be noted that FIG. 2B and FIG. 3 are only exemplary drawings, and the relative positions, shapes, numbers and sizes of the first pads 203, the second pads 104, the first through holes 105 and the second through holes 205 in FIG. 2B and FIG. 3 do not limit the embodiments of the present application.

[0054] In the embodiments of the present application, the shape of the power supply electrodes 103 is not limited, and for example, the shape of the power supply electrodes 103 can be circular, rectangular, irregular, etc. The shape of the first pads 203 is also not limited in the embodiments of the present application, and for example, the shape of the projection of the first pads 203 on the first substrate 101 can be circular, rectangular or irregular, etc.; the projection of the first pads 203 on the first substrate 101 can cover the power supply electrodes 103, can fall within the boundary of the power supply electrodes 103, or can coincide with the power supply electrodes 103. In the embodiments of the present application, the material of the first pads 203 includes but is not limited to copper and / or silver, etc.

[0055] In the embodiments of the present application, the number of power supply electrodes 103 is determined according to the number of phases of the induction coil 102. For example, when the induction coil 102 is a three-phase coil (U phase, V phase, W phase), the first pads 203 include a U phase first pad for connecting a U phase induction coil, a V phase first pad for connecting a V phase induction coil, a W phase power supply electrode for connecting a W phase, and a common connection first pad (COM). The arrangement of the first pads 203 can maintain the normal operation of the induction coil circuit, and the present application does not limit this, and those skilled in the art can determine it according to the actual production situation.

[0056] In some embodiments of the present application, the first substrate 101 (i.e., the first circuit board 10) is further provided with at least one second pad 104 on the side surface close to the second circuit board 20, and the second substrate 201 (i.e., the second circuit board 20) is provided with a third pad 204 corresponding to the second pad 104 on the side surface close to the first circuit board 10, and the corresponding second pad 104 and third pad 204 are welded and connected. In the embodiments of the present application, the second pad 104 and the third pad 204 are welded and connected by surface mounting technology. It should be noted that the second pad 104 does not need to be electrically connected to the induction coil 102, and the third pad 204 does not need to be electrically connected to the driving circuit 202. The welded second pad 104 and third pad 204 can enhance the bonding force of the first circuit board 10 and the second circuit board 20, improve the structural stability of the stator 1, and help to improve the service life of the motor. For the convenience of description, the welded second pad 104 and third pad 204 are referred to as a reinforcing point. In the embodiments of the present application, the first circuit board 10 and the second circuit board 20 can have only one reinforcing point; or can have a plurality of reinforcing points, and the plurality of reinforcing points can be arranged at intervals, for example, uniformly arranged at intervals along the circumferences of the first through hole 105 and the second through hole 205. In the embodiments of the present application, the relative positions of the power supply electrode 103 and the second pad 104 are not limited, and can be determined according to the actual production situation. In the preparation process of the stator 1, the second pad 104 and the third pad 204 can be welded at the same time as the first pad 203 and the power supply electrode 103 are welded.

[0057] It can be understood that when the second substrate 201 includes a connected bearing part and an extension part, the first pad 203 and the third pad 204 are arranged on the surface of the bearing part close to the first circuit board 10.

[0058] In the embodiments of the present application, the shapes of the second pad 104 and the third pad 204 are not limited. Specifically, the shape of the orthographic projection of the second pad 104 on the first substrate 101 can be, for example, a circle, a rectangle, or an irregular shape, etc. The orthographic projection of the third pad 204 on the second substrate 201 can be, for example, a circle, a rectangle, or an irregular shape, etc. In the embodiments of the present application, the orthographic projection of the second pad 104 on the second substrate 201 can cover the third pad 204, can fall within the boundary of the third pad 204, or can coincide with the boundary of the third pad 204. In the embodiments of the present application, the materials of the second pad 104 and the third pad 204 are not limited, as long as they can be welded and connected; for example, the materials of the second pad 104 and the third pad 204 are each independently copper and / or silver, etc.

[0059] In the embodiments of the present application, the stator 1 can be provided with a stator yoke or can not contain a stator yoke. In some embodiments of the present application, the stator 1 further comprises a stator yoke (not shown in the drawings), which is arranged on the side surface of the second circuit board 20 away from the first circuit board 10. In this way, the performance of the final axial flux motor can be further improved. In other embodiments, the stator 1 does not contain a stator yoke, so that the axial size of the axial flux motor is smaller.

[0060] In some embodiments of the present application, the method for manufacturing the stator 1 comprises:

[0061] S1, using PCB printing technology to manufacture the first circuit board 10 and using PCB printing technology to manufacture the second circuit board 20;

[0062] S2, using SMT to mount the second circuit board 20 on the second circuit board 20, and making the driving circuit 202 located outside the orthographic projection of the first circuit board 10 on the second circuit board 20.

[0063] In some embodiments of the present application, the above step S1 comprises:

[0064] Printing an inductive coil pattern on a plurality of substrates to obtain a plurality of wiring boards, laminating the above plurality of wiring boards to obtain the first circuit board 10.

[0065] In the embodiments of the present application, in the above step S1, a plurality of coil layers can be printed on each substrate at intervals to obtain a preformed board; the preformed board is cut to obtain a plurality of first circuit boards 10. The first circuit boards 10 obtained by cutting are banded and packaged, which facilitates improving the processing efficiency of the subsequent SMT process.

[0066] In the embodiments of the present application, the bottom surface of the above first circuit board 10 is left with a power supply electrode 103 of the inductive coil 102.

[0067] In some embodiments of the present application, using PCB printing technology to manufacture the second circuit board 20 comprises:

[0068] Using PCB technology to print circuit wiring 202a of the driving circuit 202 on the substrate, and then using SMT technology to mount electronic components 202b. Considering process saving, the above electronic components 202b can be prepared together with the first circuit board 10 and the second circuit board 20 in step S2.

[0069] Please refer to Fig. 4A and Fig. 4B, the embodiment of the present application further provides an axial flux motor 100, which comprises the stator 1 and the rotor 2 penetrating the stator 1. Due to the adoption of the stator 1, the axial dimension of the axial flux motor 100 is smaller than that of the related art, and when the axial flux motor 100 is applied in a fan or the like, the space utilization of the fan or the like can be effectively improved. Therefore, the market prospect of the axial flux motor 100 is better.

[0070] In some embodiments of the present application, the first substrate 101 is provided with the first through hole 105, the second substrate 201 is provided with the second through hole 205, the first through hole 105 and the second through hole 205 are arranged correspondingly, and the rotor 2 penetrates the first through hole 105 and the second through hole 205 in sequence.

[0071] In some embodiments of the present application, the rotor 2 comprises the rotor housing 21 and the axial flux sheet 22 arranged in an axial direction; the rotor housing 21 comprises the rotating shaft 211, the rotating shaft 211 penetrates the axial flux sheet 22, the first circuit board 10 and the second circuit board 20 in sequence; specifically, the rotating shaft 211 penetrates the first through hole 105 and the second through hole 205.

[0072] In some specific embodiments, the rotor housing 21 comprises the shell 212 and the rotating shaft 211, the rotating shaft 211 is fixed on the shell 212; the axial flux sheet 22 is provided with the third through hole 221, the third through hole 221 is located at the center of the axial flux sheet 22, and the rotating shaft 211 penetrates the third through hole 221; the shell 212 covers the side surface of the axial flux sheet 22 away from the first circuit board 10. In some embodiments, the rotating shaft 211 is fixed at the center of the shell 212.

[0073] It can be understood that, in order to form a magnetic field, the axial flux sheet 22 comprises the N-pole magnet and the S-pole magnet arranged alternately in the embodiment of the present application.

[0074] In some embodiments of the present application, referring to Fig. 5B, the stator 1 and the rotor 2 are provided with an air gap; specifically, the axial flux sheet 22 and the first circuit board 10 are provided with an air gap. In this way, the normal operation of the axial flux motor 100 is facilitated. The axial dimension of the air gap can be determined by the person skilled in the art according to the actual application.

[0075] In some embodiments of the present application, the axial flux motor 100 further comprises a base 23, the base 23 is nested with the stator 1 and the rotor 2, the base 23 comprises a middle tube 231, the middle tube 231 is used to accommodate the rotating shaft 211 of the rotor 2, so as to fix the rotor 2 and the stator 1. In some embodiments of the present application, the base 23 comprises a bottom plate and a side part connected with the bottom plate, the side part and the bottom plate form an accommodation space, and the stator 1 is located in the accommodation space. Specifically, the size of the side wall in the extension direction thereof can be determined according to actual production conditions. In some cases, the size of the side part in the extension direction thereof is large, and the stator 1 and the rotor 2 are located in the accommodation space. Or, in other cases, part of the stator 1 and the rotor 2 are located in the accommodation space. In the embodiments of the present application, the middle tube 231 is arranged at the center of the bottom plate, or the middle tube 231 can also be arranged at other positions on the bottom plate, which is suitable for the assembly of the stator 1 and the rotor 2.

[0076] In some embodiments, the second substrate 201 comprises a bearing part and an extension part, in order to accommodate the stator 1, a through hole is arranged on the side part of the base 23, and the extension part extends from the bearing part to the outside of the base 23 through the through hole. In this way, the driving circuit 202 is convenient to connect with the external circuit.

[0077] In some embodiments, the base 23 further comprises a bearing 232 (not shown in FIG. 4A); wherein the bearing 232 is located in the middle tube 231 and is used to support the rotating shaft 211. The bearing 232 can reduce the friction coefficient during the rotation of the rotating shaft 211, and ensure the rotation accuracy. In some embodiments, the base 23 further comprises a wear-resistant sheet 233 (not shown in FIG. 4A) arranged between the rotating shaft 211 and the bottom plate 33, and a gasket 234 arranged on the rotating shaft 211 and covering the bearing 232.

[0078] Please refer to FIG. 5A and FIG. 5B, the embodiments of the present application further provide a fan 400, which comprises the axial flux motor 100 provided by the embodiments of the present application and an air outlet assembly 4, the air outlet assembly 4 comprises blades 41, the blades 41 are formed on the outer periphery of the rotor 2; the rotor 2, the stator 1 and the base 23 are nested in sequence, and an annular accommodation space is formed between the base 23 and the stator 1, and at least part of the blades 41 is located in the annular accommodation space.

[0079] Due to the axial flux motor 100 provided by the embodiment of the present application, the outer peripheral space of the stator 1 of the axial flux motor 100 can be released to the blades 41, so the blades 41 can extend from the outer periphery of the rotor 2 to the outer periphery of the stator 1, that is, at least part of the blades 41 is located in the annular receiving space formed between the base 23 and the stator 1. In this way, the space utilization of the fan 400 can be effectively improved. Specifically, when the size of the blades 41 is unchanged, the axial height of the fan 400 can be effectively reduced; or when the axial height of the fan 400 is unchanged, the size of the blades 41 in the axial direction of the fan 400 can be increased, and the aerodynamic performance of the fan 400 is optimized.

[0080] In some embodiments of the present application, the air outlet assembly 4 further comprises a hub 42, the blades 41 are fixed on the hub 42, and the hub 42 is fixed on the rotor 2. In some specific embodiments, the hub 42 is fixed on the shell 212.

[0081] In some embodiments of the present application, the base 23 comprises a bottom plate and a side part connected to the bottom plate, the bottom plate and the side part form a receiving space, the stator 1 is located in the receiving space, and the annular receiving space is formed between the stator 1 and the side part, and at least part of the blades 41 is located in the annular receiving space. In some specific embodiments, the second base plate 201 of the stator 1 of the axial flux motor 100 comprises a bearing part and an extension part connected to each other, the side part of the base 23 has a through hole, and the extension part extends from the bearing part to the outside of the base 23 through the through hole.

[0082] In the embodiments of the present application, the fan can further comprise any component suitable for a micro fan known in the art, and the present application does not limit this.

[0083] The embodiments of the present application further provide a terminal device comprising the fan 400 provided by the embodiments of the present application, or comprising the axial flux motor 100 provided by the embodiments of the present application. In the embodiments of the present application, the fan 400 is used to dissipate heat for components in the terminal device, and the fan 400 can be arranged in cooperation with a high-heat component in the terminal device. By using the fan 400 provided by the embodiments of the present application, more internal space of the terminal device can be released, the volume of the terminal device can be further reduced, or the internal space can be released to other components to improve the performance of the terminal device, so that the market competitiveness of the terminal device can be improved.

[0084] In some other embodiments of the present application, the hard disk in the terminal device comprises the axial flux motor provided by the embodiments of the present application, and the axial flux motor is used to drive the hard disk.

[0085] In some embodiments of the present application, the terminal device comprises a notebook computer, a mobile phone, or other portable terminal products.

[0086] The embodiment of the present application further provides a robot joint comprising the aforementioned axial flux motor 100 provided by the embodiment of the present application. Since the axial dimension of the axial flux motor 100 provided by the embodiment of the present application is smaller than that of the related art, the robot joint has better market competitiveness.

[0087] The embodiment of the present application further provides a robot comprising the robot joint provided by the embodiment of the present application. Since the robot joint provided by the embodiment of the present application is adopted, the robot has better market prospect.

[0088] It should be understood that the first, second and various numerical numbers involved herein are only for the convenience of differentiation in description, and do not limit the scope of the present application.

[0089] In the present application, the association relationship of "and / or" describing the associated objects means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after it are in an "or" relationship.

[0090] In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or the like means any combination of these items, including any combination of single item or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.

[0091] In the present application, "-" represents a range value, including the end point values at both ends, for example, the value of a can be 0.5-15, which means that the value of a can be between 0.5 and 15, and the end point values 0.5 and 15 are included.

[0092] It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and part or all of the steps can be executed in parallel or in sequence, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A stator, characterized in that, It includes a first circuit board and a second circuit board surface-mounted on the first circuit board, and the first circuit board and the second circuit board are electrically connected; The first circuit board includes a first substrate and an induction coil printed on the first substrate, and the second circuit board includes a second substrate and a driving circuit disposed on the second substrate, the driving circuit being used to provide current to the induction coil; The driving circuit is located outside the boundary of the orthographic projection of the first circuit board onto the second circuit board.

2. The stator according to claim 1, characterized in that, The first substrate has a plurality of power supply electrodes on the side surface near the second circuit board, and the second substrate has a plurality of first pads that are arranged one-to-one with the plurality of power supply electrodes on the side surface near the first circuit board. The first pad and the power supply electrode are soldered together to achieve electrical connection between the first circuit board and the second circuit board.

3. The stator according to claim 1 or 2, characterized in that, The first substrate includes a plurality of wiring boards stacked along a first direction. Each wiring board has a coil layer printed on it. The coil layers on any two adjacent wiring boards are electrically connected through through holes in the wiring boards. The plurality of coil layers are connected in sequence to form the induction coil. The first direction is the stacking direction of the first circuit board and the second circuit board.

4. The stator according to claim 3, characterized in that, Each of the coil layers includes a multiphase winding, and each phase winding includes a plurality of uniformly spaced phase units, with the phase units of the same phase being electrically connected. The phase units of any adjacent coil layers of the same phase are electrically connected.

5. The stator according to any one of claims 1-4, characterized in that, The first substrate has at least one second pad on the side surface near the second circuit board, and the second substrate has a third pad on the side surface near the first circuit board that corresponds to the second pad. The corresponding second pad and the third pad are soldered together.

6. The axial flux motor according to any one of claims 1-5, characterized in that, The driving circuit includes circuit wiring printed on the second substrate, and electronic components electrically connected to the circuit wiring.

7. An axial flux motor, characterized in that, It includes a stator as described in any one of claims 1-6 and a rotor that passes through the stator.

8. The axial flux motor according to claim 7, characterized in that, The rotor includes a rotor housing and axially fitted magnetic flux plates; The axial magnetic flux sheet includes alternately arranged N-pole magnets and S-pole magnets; The rotor housing includes a rotating shaft, which sequentially passes through the axial magnetic flux sheet, the first circuit board, and the second circuit board.

9. The axial flux motor according to claim 8, characterized in that, It also includes a base; the base is nested with the stator and the rotor, and the base includes a central tube for receiving the rotating shaft to fix the rotor and the stator.

10. A fan, characterized in that, Includes the axial flux motor and air outlet assembly as described in any one of claims 7-9, wherein the air outlet assembly includes blades formed on the outer periphery of the rotor; The rotor, the stator, and the base are nested in sequence, and an annular receiving space is formed between the base and the stator; The blade is at least partially located within the annular containment space.

11. A terminal device, characterized in that, Includes the fan as described in claim 10, or includes the axial flux motor as described in any one of claims 7-9.

12. A robot joint, characterized in that, Including the axial flux motor as described in any one of claims 7-9.

13. A robot, characterized in that, Including the robot joint as described in claim 12.

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