PCB fixing structure and motor

Abstract

The invention discloses a PCB fixing structure and a motor. The PCB fixing structure comprises a stator assembly, a rear cover, a PCB, a flexible supporting structure and a protective cover which are sequentially arranged in the axial direction. The stator assembly is detachably and electrically connected with the PCB through three electric connection structures located on different planes, the flexible supporting structure is connected between the PCB and the protection cover in an abutting mode, the flexible supporting structure is suitable for applying axial force to the PCB so that the PCB can be axially fixed between the rear cover and the flexible supporting structure, and the PCB can axially and slightly shift when the motor vibrates. According to the PCB fixing structure, the motor and the stator assembly, the electric connection structures which are uniformly distributed in the circumferential direction are detachably and electrically connected with the PCB, the flexible supporting structure applies the axial force to the PCB, the PCB is fixed between the rear cover and the flexible supporting structure, the PCB can axially move through the flexibility characteristic of the flexible supporting structure, and the PCB is not prone to loosening and is easy to detach.

Description

Technical Field

[0001] The present invention relates to the technical field of motor design, and in particular to a PCB board fixing structure and a motor. Background Art

[0002] Conventional brushless motor PCB boards (built-in drivers) are usually installed at the rear end of the stator. The PCB board can be directly welded to the solder pins (lead wires) at the tail of the motor, but this will cause the solder beads to splash onto the PCB board during the welding process, resulting in the risk of short circuit of the PCB board; and it is inconvenient to disassemble the PCB board and the motor after welding, which will bring technical problems such as inconvenient testing and maintenance of the PCB board. In order to achieve the detachability between the PCB board and the motor, the PCB board and the back cover are now mostly fixed by screws, but as the motor rotates, the output torque will generate vibration, and the motor vibration will cause the PCB board installed in the form of screw locking to have the risk of loosening or even falling off. Summary of the invention

[0003] In order to solve the technical problems in the prior art that the PCB board in the brushless motor is directly welded to the solder pins (lead wires) at the tail of the motor, which easily causes a short circuit in the PCB board, or the PCB board and the rear cover are fastened by screws, which causes the PCB board to become loose or even fall off, the present invention provides a PCB board fixing structure and a brushless motor comprising the same to solve the above problems.

[0004] The present invention proposes a PCB board fixing structure, comprising a stator assembly, a back cover, a PCB board, a flexible support structure and a protective cover arranged in sequence along the axial direction; the stator assembly is detachably electrically connected to the PCB board through an electrical connection structure evenly distributed in the circumferential direction, the flexible support structure abuts between the PCB board and the protective cover, the flexible support structure is suitable for applying an axial force to the PCB board so that the PCB board is axially fixed between the back cover and the flexible support structure, and the PCB board can be slightly deviated axially when the motor vibrates.

[0005] Furthermore, one end of the electrical connection structure is fixed to the stator assembly, and the PCB board has a through hole through which the other end of the power supply connection structure passes in a one-to-one correspondence.

[0006] Furthermore, the electrical connection structure is transitionally matched with the through hole.

[0007] Furthermore, the electrical connection structure is fixed to the PCB board, and the electrical connection structure is a multi-section structure that is axially detachable and pluggable.

[0008] Furthermore, the electrical connection structure is an integrated structure or a multi-segment structure that is axially connected and fixed.

[0009] Furthermore, one axial end of the electrical connection structure has a first positioning column, one end of the coil frame of the stator assembly has a connecting column for the first positioning column to be inserted, and each coil frame is provided with a connecting column.

[0010] Furthermore, a first boss is provided at one end of the through hole facing the back cover, and a positioning boss abutting against the first boss is provided on one end of the back cover facing the PCB board. The electrical connection structure is connected to the PCB board through the positioning boss, and the positioning boss abuts against the end face of the first boss.

[0011] Furthermore, the inner hole diameter of the positioning boss gradually decreases from one end close to the stator assembly to one end close to the PCB board, and the minimum inner hole diameter of the positioning boss is interference fit with the electrical connection structure.

[0012] Furthermore, the flexible support structure includes a support seat and an elastic member squeezed between the support seat and the protective cover, and the support seat is provided with a support foot that abuts against the PCB board.

[0013] Furthermore, the elastic member is a spring, the end of the support seat has a second positioning column on which the spring is sleeved, the end surface of the protective cover has a first groove for accommodating the spring, and when the motor is not working, the length of the spring is greater than the length of the second positioning column.

[0014] Furthermore, the first groove is interference fit with the spring.

[0015] Furthermore, the surface of the support seat has a second groove located on the outer periphery of the second positioning column, and the second groove is interference fit with the outer surface of the spring.

[0016] Furthermore, the second positioning column is at least partially located in the first groove.

[0017] The present invention also provides a motor, comprising the above-mentioned PCB board fixing structure.

[0018] The beneficial effects of the present invention are:

[0019] (1) In the PCB board fixing structure and the motor described in the present invention, the stator assembly is detachably electrically connected to the PCB board through an electrical connection structure evenly distributed in the circumferential direction. The flexible support structure applies an axial force to the PCB board to fix the PCB board between the back cover and the flexible support structure. The flexible characteristics of the flexible support structure are utilized to enable the PCB board to move axially. The PCB board is not easy to loosen and is easy to disassemble.

[0020] (2) In the present invention, when the motor is not working and does not generate vibration, the axial force of the spring is transferred to the support foot of the support seat to press against the PCB board, so that the PCB board abuts against the rear cover, and the PCB board is axially limited. When the motor generates a certain vibration, the PCB board may shake to a certain extent, and the spring can suppress the axial movement of the PCB board and have a certain buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 is an axial cross-sectional view of the motor of the present invention;

[0023] Figure 2 is an exploded view of the motor of the present invention;

[0024] Figure 3 It is a schematic diagram of the female hole of the crown spring in the PCB board fixing structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the pin structure in the PCB board fixing structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the assembly of the crown spring male and female pins and the stator assembly in the PCB board fixing structure of the present invention;

[0027] Figure 6 It is a three-dimensional diagram of the rear cover in the PCB board fixing structure of the present invention;

[0028] Figure 7 It is a schematic diagram of the assembly of the male and female pins of the crown spring and the tapered hole in the PCB board fixing structure of the present invention;

[0029] Figure 8 It is a schematic diagram of the assembly of the male and female pins of the crown spring and the back cover in the PCB board fixing structure of the present invention;

[0030] Fig. 9 is a three-dimensional diagram of a PCB board in the PCB board fixing structure of the present invention;

[0031] Fig.10 It is a schematic diagram of the fitting of the rear cover and the end surface of the stator assembly in the PCB board fixing structure of the present invention;

[0032] Fig.11 It is a three-dimensional diagram of the support seat in the PCB board fixing structure of the present invention;

[0033] Fig.12 is a schematic diagram of the matching relationship between the flexible support structure and the PCB board fixing structure of the present invention;

[0034] Fig.13It is a schematic diagram of the circumferential and axial limiting of the PCB board in the present invention.

[0035] In the figure, 1, stator assembly, 101, coil frame, 102, stator core, 2, back cover, 201, tapered hole, 202, positioning boss, 3, protective cover, 301, first groove, 4, PCB board, 401, through hole, 402, first boss, 5, flexible support structure, 501, support seat, 502, spring, 503, support foot, 6, crown spring male and female needles, 601, crown spring female hole, 6011, crown spring, 602, needle part, 603, first fixing column, 604, first positioning column, 7, connecting column, 8, shell, 9, second positioning column, 10, second groove, 11, rotor assembly, 12, motor shaft. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In view of the conventional brushless motor, the motor lead wire is welded and fixed to the PCB board by welding, which makes it inconvenient to disassemble the PCB board and the stator assembly, and is not convenient for PCB board maintenance. If the PCB board is detachably fixed by screw locking, the screws may loosen due to motor vibration, thereby causing the PCB board to fall off. The present invention proposes a PCB board fixing structure, which fixes the PCB board 4 in a detachable manner and axially fixes the PCB board 4 by a flexible support structure 5. When the motor generates a certain vibration, the flexible support structure 5 can apply axial force to the PCB board 4 to reduce the risk of loosening of the detachable fixing part of the PCB board 4 and the motor. Even if there is a risk of loosening after working for a long time, the flexible support structure 5 can also resist the PCB board 4 to prevent it from falling off, and can be locked during maintenance without affecting the normal use of the motor.

[0038] Specifically, the PCB board fixing structure includes a stator assembly 1, a rear cover 2, a PCB board 4, a flexible support structure 5 and a protective cover 3 arranged in sequence along the axial direction. The stator assembly 1 is detachably electrically connected to the PCB board 4 through an electrical connection structure evenly distributed in the circumferential direction, and at least two electrical connection structures are provided. The flexible support structure 5 abuts between the PCB board 4 and the protective cover 3. The flexible support structure 5 is suitable for applying an axial force to the PCB board 4, so that the PCB board 4 is axially fixed between the rear cover 2 and the flexible support structure 5, and the PCB board 4 can be slightly deflected axially when the motor vibrates.

[0039] The protective cover 3 is fixed to the housing 8 of the motor to form a shell with a cavity inside. The stator assembly 1, the back cover 2 and the PCB board 4 are all located in the cavity. The detachable electrical connection between the stator assembly 1 and the PCB board 4 can be a connection method that requires tools to disassemble, such as threaded connection, snap connection, etc., or other directly detachable methods, and the specific methods are described below. The electrical connection structure evenly distributed in the circumferential direction can position the PCB board 4 circumferentially, so that the PCB board 4 is coaxially arranged with the stator assembly 1 and the back cover 2, and the electrical connection structure not only realizes the detachable connection between the stator assembly 1 and the PCB board 4, but also completes the circumferential positioning, thereby simplifying the internal structure of the motor. The connection between the PCB board 4 and the stator assembly 1 is located at one end of the PCB board 4, and the flexible support structure 5 squeezes the other end of the PCB board 4 to make it against the back cover 2, thereby achieving the effect of complete axial fixation, and even if the electrical connection part is loose to a certain extent when the motor vibrates, the flexible support structure 5 can also hold the PCB board 4 back to reset to prevent it from falling off. The overall structure is simple and reliable.

[0040] The PCB board fixing structure of the present invention can be used for unidirectional, bidirectional, three-phase or other types of brushless motors. Different numbers of electrical connection structures are configured according to different brushless motor models. The following is a specific description of the PCB board fixing structure for a three-phase brushless motor as an example.

[0041] Embodiment 1

[0042] like Figure 1 and Figure 2 As shown, a PCB board fixing structure comprises a stator assembly 1, a rear cover 2, a PCB board 4, a flexible support structure 5 and a protective cover 3 which are sequentially abutted in the axial direction. The stator assembly 1 is detachably electrically connected to the PCB board 4 through three electrical connection structures evenly distributed in the circumferential direction, the flexible support structure 5 abuts between the PCB board 4 and the protective cover 3, and the flexible support structure 5 is suitable for applying an axial force to the PCB board 4 so that the PCB board 4 is axially fixed between the rear cover 2 and the flexible support structure 5, and the PCB board 4 can be slightly deflected in the axial direction when the motor vibrates.

[0043] The stator assembly 1 and the PCB board 4 are in contact and matched with each other through an electrical connection structure, so that the stator assembly 1 and the PCB board 4 are detachably electrically connected. The contact and matching refers to realizing electrical connection and structural connection by contact, and when disassembly is required, it can be directly separated manually, which is also the above-mentioned direct disassembly method.

[0044] The electrical connection structure can be an integrated pin or a multi-segment structure connected axially. The multi-segment structure can be a multi-segment structure connected axially and fixed, or a multi-segment structure that can be axially detachably connected and plugged in. For example, the crown spring male and female pins 6 are a kind of separate pins, which is a prior art, and its internal principle is not described here. Figure 1-Figure 5As shown, the crown spring male and female needles 6 include a crown spring female hole 601 and a needle portion 602 that are plugged into each other. The crown spring female hole 601 is connected to the stator assembly 1, and the needle portion 602 is connected to the PCB board 4. The needle portion 602 is inserted into the crown spring 6011 at the end of the crown spring female hole 601. Since the back cover 2 is located between the stator assembly 1 and the PCB board 4, the crown spring male and female needles 6 need to pass through the back cover 2. The PCB board 4 has a through hole 401 for one end of the electrical connection structure to pass through.

[0045] When the electrical connection structure is an integrated pin or a multi-section structure that is axially connected and fixed, the electrical connection structure is movably connected to the PCB board 4, for example, the integrated pin is transitionally matched with the through hole 401, and the PCB board 4 can be moved axially along the integrated pin.

[0046] When the electrical connection structure is a multi-segment structure that is axially detachable and pluggable, there are two detachable connection modes for the stator assembly 1 and the PCB board 4. For ease of description, the following is a specific description using the crown spring male and female pins 6 as an example:

[0047] The first is that one end of the needle 602 is movably matched with the crown spring 6011, and the other end of the needle 602 is fixed to the PCB board 4. Figure 3 and Figure 4 As shown, the left end of the needle part 602 is provided with a first fixing column 603, and the first fixing column 603 is elastically detachably connected to the crown spring 6011. One end of the needle part 602 passes through the through hole 401. When the needle part 602 is welded and fixedly connected to the PCB board 4, the PCB board 4 and the needle part 602 can be detachably connected to the stator assembly 1 as a whole through the detachable connection between the first fixing column 603 and the crown spring 6011. The diameter of the first fixing column 603 is smaller than the diameter of the needle part 602, so that a step surface is formed at the left end of the needle part 602. When the crown spring mother hole 601 abuts against the step surface and is plugged into place, the step surface can ensure the verticality of the first fixing column 603. The diameter of the needle part 602 is similar to the diameter of the crown spring mother hole 601. After the two are connected, a straight rod of equal diameter is formed, which helps to smoothly pass through the back cover 2.

[0048] The second connection method is that one end of the needle 602 is fixed in the crown spring 6011 at the end of the crown spring female hole 601, and the other end of the needle 602 is movably connected to the PCB board 4. Figure 8 and Fig. 9 As shown, specifically, the first fixing column 603 at the end of the pointer portion 602 is interference-fitted with the crown spring 6011, and the other end of the needle portion 602 passes through the through hole 401 and transitionally fits with the through hole 401, that is, the PCB board 4 can be moved along the axis of the needle portion 602, which not only realizes the detachable connection between the PCB board 4 and the stator assembly 1, but also realizes the electrical connection between the stator assembly 1 and the PCB board 4 due to the contact between the needle portion 602 and the through hole 401.

[0049] The through hole 401 maintains a certain length. Specifically, a boss of a certain length can be provided on one or both ends of the PCB board 4. Figure 8 As shown, the inner hole of the boss is connected to the through hole 401. The purpose of setting the boss is to ensure that the electrical connection structure and the PCB board 4 have a certain length of reliable connection, even if the PCB board 4 has a certain axial movement, the two are still reliably connected, and the longer the axial length of the mating surface, the more the straightness of the electrical connection structure can be guaranteed.

[0050] Axial connection between the stator assembly 1 and the electrical connection structure:

[0051] The electrical connection structure has a first positioning column 604 at one axial end, and a connecting column 7 for inserting the first positioning column 604 is provided at one end of the coil frame 101 of the stator assembly 1, and each coil frame 101 is provided with a connecting column 7. Figure 2 As shown, the stator assembly 1 includes a stator core 102, a plurality of coil frames 101 inserted into the stator core 102 from both ends, and a winding wound on the coil frames 101. The coil frames 101 at both ends are evenly arranged circumferentially on the stator core 102. The connecting column 7 is arranged on the coil frame 101 close to the rear cover 2. The first positioning column 604 matches the inner diameter of the connecting column 7. The diameter of the first positioning column 604 is smaller than the diameter of the main body of the electrical connection structure. Taking the crown spring male and female needle 6 as an example, the first positioning column 604 is located at one end of the crown spring female hole 601. The diameter of the first positioning column 604 is smaller than the diameter of the crown spring female hole 601. The crown spring female hole 601 can be against the end surface of the connecting column 7.

[0052] Since the PCB board fixing structure described in the present invention is used for a three-phase brushless motor, three electrical connection structures are provided, and a through hole for the electrical connection structure to pass through is provided on the back cover 2. The three electrical connection structures pass through the through hole to connect to the PCB board 4, and the three electrical connection structures are preferably evenly distributed in the circumferential direction. The number of winding parts of the coil skeleton 101 (referring to the number of winding parts of the coil skeleton 101 at one end of the stator core 102) is usually more than three, and a connecting column 7 is provided on the winding parts of at least three coil skeletons 101. At this time, the number of connecting columns 7 is more than the number of first positioning columns 604, which can reduce the probability of installation misalignment. During installation, only three of the connecting columns 7 need to be connected to the first positioning column 604. Preferably, a connecting column 7 is provided on the winding part of each coil skeleton 101. In this embodiment, six winding parts of the coil skeleton 101 are provided. Then, the winding parts of the six coil skeletons 101 have the same structure, each of which is provided with a connecting column 7, and can be made by a mold, and no orientation assembly is required during installation.

[0053] The assembly process of the PCB board 4 is: the electrical connection structure is inserted into the coil frame 101, the winding on the winding part is wound onto the electrical connection structure and welded, and then the back cover 2 is installed, and the other end of the electrical connection structure passes through the through hole of the back cover 2 and cooperates with the PCB board 4 on one side of the back cover 2.

[0054] Axial docking of the rear cover 2 and the PCB board 4:

[0055] A first boss 402 is provided at one end of the through hole 401 facing the rear cover 2, and a positioning boss 202 is provided on the rear cover 2 facing the end of the PCB board 4 and abuts against the first boss 402. A through hole is provided at the center of the positioning boss 202, and the electrical connection structure passes through the positioning boss 202 and is connected to the PCB board 4. The positioning boss 202 abuts against the end face of the first boss 402. The arrangement of the first boss 402 can prevent the PCB board 4 from directly contacting the end face of the rear cover 2, and protect the components on the surface of the PCB board 4. The other end of the rear cover 2 abuts against the stator assembly 1, and the stator assembly 1 and the housing 8 can be axially positioned through the step structure.

[0056] To ensure the straightness and smoothness of the installation of the electrical connection structure, it is preferred that the inner hole diameter of the positioning boss 202 gradually decreases from one end close to the stator assembly 1 to the end close to the PCB board 4, and the minimum diameter of the inner hole of the positioning boss 202 has an interference fit with the electrical connection structure, that is, the through hole in the center of the positioning boss 202 is a tapered hole 201. This can facilitate installation on the one hand, and on the other hand avoid the electrical connection structure being suspended at the right end, causing the center to shift and being unable to dock with the through hole 401 of the PCB board 4.

[0057] like Figure 5 As shown, taking the crown spring male and female needles 6 as an example, after the crown spring male and female needles 6 are matched with the coil frame 101, the three circumferentially evenly distributed tapered holes 201 of the back cover 2 are matched with the crown spring male and female needles 6. After the tapered holes 201 are matched with the needle part 602, the back cover 2 is moved vertically downward to make the end face of the back cover 2 fit with the end face of the stator core 102 in the stator assembly 1 (as shown in FIG. Fig.10 As shown), the positioning of the rear cover 2 is completed.

[0058] like Figure 8 and Fig. 9 As shown, the inner diameters of the three through holes 401 of the PCB board 4 are matched with the outer diameter of the needle portion 602 , and the first boss 402 at the lower end of the PCB board 4 is fitted with the upper end surface of the positioning boss 202 of the back cover 2 with the tapered hole 201 .

[0059] Three electrical connection structures are arranged evenly circumferentially on the coil skeleton 101, and the corresponding positioning bosses 202 and first bosses 402 are also evenly arranged circumferentially, which not only realizes the electrical connection between the PCB board 4 and the stator assembly 1, but also ensures the reliable positioning of the PCB board 4 in the circumferential direction.

[0060] Flexible support structure 5:

[0061] like Figure 1 , Figure 10-12 As shown, the flexible support structure 5 includes a support seat 501 and an elastic member squeezed between the support seat 501 and the protective cover 3, and the support seat 501 is provided with a support leg 503 that abuts against the PCB board 4. The support leg 503 can reduce the contact area between the support seat 501 and the PCB board 4 to avoid damaging the components on the surface of the PCB board 4. The elastic member refers to a component that can be axially squeezed and deformed and can generate a reset force, such as a spring 502, a rubber pad, etc.

[0062] When the motor is not working and does not generate vibration, the elastic member transmits axial force to the support foot 503 of the support seat 501 to press against the PCB board 4, so that the PCB board 4 abuts against the positioning boss 202 of the rear cover 2, so that the PCB board 4 is axially limited. When the motor generates a certain vibration, the PCB board 4 may shake to a certain extent, and the elastic member can suppress the axial movement of the PCB board 4 and has a certain buffering effect.

[0063] like Fig.11 and Fig.13 As shown, three legs 503 are provided on the support base 501 , the lower end surfaces of the three legs 503 are in contact with the upper end surface of the PCB board 4 , and the length of the legs 503 is set according to the height of the components on the PCB board 4 .

[0064] The height of the support foot 503 is preferably higher than the height of the components on the PCB board 4. When the support base 501 is subjected to the downward axial force of the spring 502, the lower end surface of the support foot 503 abuts against the plane of the PCB board 4 and fixes the PCB board 4 without interference with the components.

[0065] Preferably, the elastic member is a spring 502. The end of the support seat 501 has a second positioning column 9 on which the spring 502 is sleeved, and the end surface of the protective cover 3 has a first groove 301 for accommodating the spring 502. When the motor is not working, the length of the spring 502 is greater than the length of the positioning column. During installation, the inner hole of the spring 502 is matched with the three second positioning columns 9, and then the three first grooves 301 of the protective cover 3 are matched with the outer diameter of the spring 502.

[0066] like Fig.12As shown, there are three first grooves 301 in the protective cover 3 that are interference fit with the outer diameter of the spring 502. When the spring 502 is subjected to axial force, the first grooves 301 wrap the spring 502, so that the spring 502 will not deform to the left or right and is always axially tightened. The length of the spring 502 when the motor is not working and does not generate vibration is longer than the length of the second positioning column 9, and the extra length is the length that the spring 502 can be compressed (the length and pressure of the spring 502 can be adjusted and selected according to different needs). With three springs 502 evenly distributed around the circumference, the PCB board 4 is evenly stressed and not easy to tilt. At the same time, the radial movement of the spring 502 is limited by the first grooves 301, ensuring the stability of the structure.

[0067] The second positioning column 9 is at least partially located in the first groove 301, including the motor non-working state and the motor working state. The second positioning column 9 is at least partially deep into the first groove 301. The vibration generated during the operation of the motor will cause the support base 501 to shift. The three first grooves 301 can play a role in positioning and limiting.

[0068] like Fig.11 As shown, the surface of the support seat 501 has a second groove 10 located on the outer periphery of the second positioning column 9. The second groove 10 is interference fit with the outer surface of the spring 502, which also plays a role in preventing the radial deformation of the spring 502.

[0069] When the motor is not working and does not generate vibration, the spring 502 transmits axial force to the support seat 501, so that the support foot 503 abuts against the PCB board 4, and the PCB board 4 abuts against the positioning boss 202 of the rear cover 2, so that the PCB board 4 is axially limited. When the motor generates a certain vibration, the PCB board 4 may shake to a certain extent, and the spring 502 can suppress the axial movement of the PCB board 4 and has a certain buffering effect.

[0070] like Fig.13 As shown, this structure electrically connects the stator assembly 1 to the PCB board 4 through an electrical connection structure. No axial fixation is performed in the connection, only circumferential positioning is performed. In the axial direction, an axial force is applied to the support seat 501 by the spring 502, so that the PCB board 4 is pressed against the back cover 2. The whole structure is detachable. The PCB board 4 can be removed by removing the spring 502. The spring 502 and the electrical connection structure are respectively located on both sides of the PCB board 4. Under the action of the spring 502, the PCB board 4 is always pushed toward the direction of the electrical connection structure, thereby preventing the electrical connection structure from detaching from the through hole 401, thereby achieving the technical problem of reducing shaking and preventing the PCB board 4 from falling off when the PCB board 4 is detachable.

[0071] Embodiment 2

[0072] A motor, comprising the above-mentioned PCB board fixing structure, such as Figure 2As shown, the motor further includes a rotor assembly 11 located inside the stator assembly 1 , and both ends of a motor shaft 12 of the rotor assembly 11 are rotatably connected to the housing 8 and the rear cover 2 respectively, and an output end of the motor shaft 12 extends from one end of the housing 8 .

[0073] In the description of the present invention, it is necessary to understand that the terms "length", "up", "down", "left", "right", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0075] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0076] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A PCB board fixing structure, characterized in that: It comprises a stator assembly (1), a rear cover (2), a PCB board (4), a flexible support structure (5) and a protective cover (3) which are sequentially arranged along the axial direction; The stator assembly (1) is detachably electrically connected to the PCB board (4) via an electrical connection structure evenly distributed in the circumferential direction; the flexible support structure (5) is abutted between the PCB board (4) and the protective cover (3); the flexible support structure (5) is suitable for applying an axial force to the PCB board (4) so ​​that the PCB board (4) is axially fixed between the rear cover (2) and the flexible support structure (5); and the PCB board (4) can be slightly deflected axially when the motor vibrates.

2. The PCB board fixing structure according to claim 1, characterized in that: One end of the electrical connection structure is fixed to the stator assembly (1), and the PCB board (4) has through holes (401) through which the other end of the power supply connection structure passes in a one-to-one correspondence.

3. The PCB board fixing structure according to claim 2, characterized in that: The electrical connection structure is transitionally matched with the through hole (401).

4. The PCB board fixing structure according to claim 2, characterized in that: The electrical connection structure is fixed to the PCB board (4), and the electrical connection structure is a multi-section structure that is axially detachable and pluggable.

5. The PCB board fixing structure according to claim 3, characterized in that: The electrical connection structure is an integrated structure or a multi-segment structure that is axially connected and fixed.

6. The PCB board fixing structure according to claim 1, characterized in that: The electrical connection structure has a first positioning column (604) at one axial end, and a connecting column (7) for inserting the first positioning column (604) is provided at one end of the coil frame (101) of the stator assembly (1), and each coil frame (101) is provided with a connecting column (7).

7. The PCB board fixing structure according to claim 2, characterized in that: The through hole (401) is provided with a first boss (402) at one end facing the rear cover (2); the rear cover (2) is provided with a positioning boss (202) abutting against the first boss (402) at one end facing the PCB board (4); the electrical connection structure passes through the positioning boss (202) and is connected to the PCB board (4); the positioning boss (202) abuts against the end surface of the first boss (402).

8. The PCB board fixing structure according to claim 7, characterized in that: The inner hole diameter of the positioning boss (202) gradually decreases from one end close to the stator assembly (1) to one end close to the PCB board (4), and the minimum inner hole diameter of the positioning boss (202) is interference-fitted with the electrical connection structure.

9. The PCB board fixing structure according to claim 1, characterized in that: The flexible support structure (5) comprises a support seat (501) and an elastic member squeezed between the support seat (501) and the protective cover (3); the support seat (501) is provided with a support foot (503) abutting against the PCB board (4).

10. The PCB board fixing structure according to claim 9, characterized in that: The elastic member is a spring (502), the end of the support seat (501) has a second positioning column (9) on which the spring (502) is sleeved, the end surface of the protective cover (3) has a first groove (301) for accommodating the spring (502), and when the motor is not in operation, the length of the spring (502) is greater than the length of the second positioning column (9).

11. The PCB board fixing structure according to claim 10, characterized in that: The first groove (301) and the spring (502) are interference fit.

12. The PCB board fixing structure according to claim 10, characterized in that: The surface of the support seat (501) has a second groove (10) located on the outer periphery of the second positioning column (9), and the second groove (10) is interference-fitted with the outer surface of the spring (502).

13. The PCB board fixing structure according to claim 12, characterized in that: The second positioning column (9) is at least partially located in the first groove (301).

14. A motor, characterized in that: It comprises the PCB board fixing structure as described in any one of claims 1-13.

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