A method of securing a motor stator
By designing holes on the PCB to match the posts on the lower cover of the stator, the problem of the Hall sensor and stator position misalignment during motor startup was solved, thereby improving motor efficiency and facilitating production and disassembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG SHENGHUI TECHNOLOGY CO LTD
- Filing Date
- 2024-08-22
- Publication Date
- 2026-07-07
AI Technical Summary
When the motor starts, the Hall sensor and the stator are prone to positional misalignment, which affects the motor efficiency.
Holes are designed on the PCB and mate with the posts on the lower cover of the stator. The Hall sensor and the stator are fixed in position by the insertion of the holes and posts to prevent displacement.
This method achieves fixed positions for the Hall sensor and stator, improves motor operating efficiency, and simplifies product manufacturing and assembly/disassembly processes.
Smart Images
Figure CN118783698B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor technology, and more specifically, to a method for fixing a motor stator. Background Technology
[0002] PCBs are typically mounted at the stator end of the motor, such as... Figure 3 As shown, a Hall sensor will be soldered onto the motor PCB, such as... Figure 4 As shown, the position of the Hall sensor is fixed relative to the stator. When a motor starts, it will cause the PCB to shift to some extent, thereby changing the relative position between the PCB and the stator. This causes a positional offset between the Hall sensor and the stator, which will affect the motor efficiency. Therefore, this invention aims to solve the problem of how to prevent the Hall sensor from shifting between the stator when the motor starts. Summary of the Invention
[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0004] To at least partially solve the above problems, the present invention provides a method for fixing a motor stator, comprising: providing at least one hole on a PCB connected to the stator, providing at least one post adapted to the hole on the inner surface of a stator lower cover connected to the stator, and inserting the post into the hole when the stator lower cover is connected to the stator.
[0005] Preferably, the number of holes is the same as the number of posts.
[0006] Preferably, the PCB is an annular structure with a central hole.
[0007] Preferably, the hole is connected to the central hole, and the chord length S at the connection between the hole and the central hole is not greater than the inner diameter R of the hole.
[0008] Preferably, the outer diameter of the column is adapted to the inner diameter of the hole.
[0009] Preferably, the hole is a first hole, the post is a first post, the first hole is a cylindrical hole, the first post is composed of a cylindrical first abutting part adapted to the first hole, a first supporting part disposed at one end of the first abutting part, and a first extension part disposed at the other end of the first abutting part, the bottom of the first supporting part abuts against the end face of the stator, and the first abutting part is connected to the lower cover of the stator through the first extension part.
[0010] Preferably, the hole is a second hole, the column is a second column, the second hole is a tapered hole that is larger at the top and smaller at the bottom, the second column consists of a second abutting part that is tapered and larger at the top and smaller at the bottom and adapted to the second hole, a second supporting part disposed at one end of the second abutting part, and a second extension part disposed at the other end of the second abutting part. The bottom of the second supporting part abuts against the end face of the stator, the second abutting part is connected to the lower cover of the stator through the second extension part, and a pad is disposed at the bottom of the second supporting part.
[0011] Preferably, the outer diameter of the column is smaller than the inner diameter of the hole.
[0012] Preferably, the hole is a third hole, the post is a third post, and the third hole has a tapered groove with a smaller top and a larger bottom near the stator opening. The third hole has a first filling member consisting of a third abutting part that abuts against the inner wall of the third hole, a third supporting part located at one end of the third abutting part, and a third extension part located at the other end of the third abutting part. The third abutting part, the third supporting part, and the third extension part are all hollow structures. The outer wall of the third supporting part is tapered with a smaller top and a larger bottom to adapt to the tapered groove. The bottom of the third supporting part abuts against the stator end, and the bottom of the third extension part abuts against the top surface of the PCB. The third supporting part has a second filling member with an insertion hole, and the third post is inserted into the third hole through the first filling member.
[0013] Preferably, the hole is a fourth hole, the post is a fourth post, the fourth post is a threaded post, the fourth hole is a cylindrical hole, a fourth support portion is provided between the fourth hole and the stator end, the bottom of the fourth support portion abuts against the stator end, the top of the fourth support portion abuts against the bottom of the PCB, the top of the fourth support portion is provided with a fourth extension portion extending into the fourth hole, the height of the fourth extension portion is less than the depth of the fourth hole, the outer diameter of the fourth extension portion is less than the inner diameter of the fourth hole, the top of the fourth extension portion is provided with a threaded hole adapted to the fourth post, a fourth abutting portion is sleeved on the outside of the fourth extension portion, the fourth abutting portion is an elastic element, the height of the fourth abutting portion is greater than the depth of the fourth hole, and the top of the fourth abutting portion selectively abuts against the top of the fourth post.
[0014] Compared with the prior art, the present invention has at least the following beneficial effects:
[0015] By designing holes on the PCB and cooperating with the pillars on the stator lower cover, the positions of the Hall sensor and the stator can be fixed and unified. The above structural design makes product manufacturing and disassembly and assembly more convenient. The pillars provide force to the PCB, avoiding the impact on the PCB when the motor starts and rotates, which would then affect the Hall sensor on it.
[0016] The method for fixing the motor stator described in this invention, other advantages, objectives and features of this invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of this invention. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:
[0018] Figure 1 This is a top view of the PCB in this invention.
[0019] Figure 2 This is a schematic diagram showing the positions of the four holes on the PCB in this invention.
[0020] Figure 3 This is a physical diagram of the PCB on the stator in this invention.
[0021] Figure 4 This is a schematic diagram showing the position of the Hall sensor on the PCB in this invention.
[0022] Figure 5 This is a schematic cross-sectional view of the first column in the second embodiment of the present invention.
[0023] Figure 6 This is a schematic cross-sectional view of the second column in the third embodiment of the present invention.
[0024] Figure 7 This is a schematic diagram showing the position between the first filler and the PCB in the fourth embodiment of the present invention.
[0025] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure of the first filler component.
[0026] Figure 9 This is a cross-sectional view of the fifth embodiment of the present invention.
[0027] Figure 10 This is a schematic diagram illustrating the fixing of the device to the PCB in the fifth embodiment of the present invention.
[0028] In the diagram: 1 PCB, holes a, b, c, d, 2 center hole, 3a first post, 31 first abutment, 32 first support, 33 first extension, 4a second post, 41 second abutment, 42 second support, 43 second extension, 5a third post, 6 first filler, 61 third abutment, 62 third support, 63 third extension, 64 second filler, 7a fourth post, 8 fourth support, 9 fourth extension, 10 fourth abutment, 11 stator, 12 Hall sensor. Detailed Implementation
[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.
[0030] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0031] like Figures 1-10 As shown, this invention provides a method for fixing a motor stator, comprising: designing at least one hole on the PCB for connection to the stator in the early stages of PCB design; and setting at least one post corresponding to the hole on the inner surface of the stator lower cover connected to the stator; when the stator lower cover is connected to the stator, the post is inserted into the hole. This achieves the limiting and fixing of the PCB, and after enhancing the PCB's robustness, it can prevent the PCB from rotating relative to the stator when the motor starts, thereby preventing positional displacement between the Hall sensor and the stator. The number of holes is the same as the number of posts. Typically, four holes are selected, as shown below. Figure 1-3 As shown, holes a, b, c, and d are correspondingly positioned on the stator lower cover opposite to these holes. Four posts are then positioned to restrict the axial rotation of the PCB. The PCB is an annular structure with a central hole 2. All four holes a, b, c, and d communicate with the central hole 2, and the chord length S at the point of connection between the hole and the central hole 2 is no greater than the inner diameter R of the hole. That is, the cross-sections of the four holes a, b, c, and d are all semicircles, or the arcs formed by their cross-sections on the PCB are dominant arcs. This ensures a sufficiently large contact area between the posts and the holes, effectively preventing the PCB from rotating.
[0032] The working principle and beneficial effects of the above technical solution are as follows: By designing holes on the PCB and cooperating with the columns on the stator lower cover, the positions of the Hall sensor and the stator can be fixed and unified. Furthermore, the above structural design makes product manufacturing and disassembly and assembly more convenient. The columns provide force to the PCB, preventing the motor from affecting the PCB when it starts and rotates, and thus avoiding any impact on the Hall sensor on it.
[0033] In the above embodiments, we provide a very simple structural design. Its advantage lies in its simplicity. By setting four holes a, b, c, and d and four posts, we ensure that when the PCB rotates, the posts provide sufficient force to prevent rotation. The reason for choosing four holes a, b, c, and d is that although the outer diameter of the posts and the inner diameter of the holes are required to be the same, there will be some error during manufacturing. This means that only a portion of the outer surface of the post can actually fit against the inner wall of the hole, rather than completely, because the contact surface between each post and each hole is at a different position. For example, ... Figure 2 The holes a, b, c, and d, arranged clockwise, provide good limiting effect when the four posts and four holes are in partial contact on their right sides. If the PCB rotates counter-clockwise during motor startup, the four posts will provide good limiting effect. However, if the PCB rotates clockwise, it will rotate a certain distance first (changing the position of the Hall sensor as the PCB rotates) until all the posts and holes are in contact on their left sides. Because the manufacturing process is simple, the first implementation method utilizes quantity to compensate for the rough manufacturing process and low production cost. However, this also presents a problem: the more posts and holes there are, the more difficult it is to install the stator lower cover, and more space needs to be reserved for the holes when designing the PCB. Therefore, we provide four other implementation methods to solve the above technical problems.
[0034] In the second embodiment, the outer diameter of the post is adapted to the inner diameter of the hole. The hole is a first hole, and the post is a first post 3a. The first hole is a cylindrical hole, that is, the inner diameter of the hole is the same from top to bottom. The first post 3a consists of a cylindrical first abutment portion 31 adapted to the first hole, a first support portion 32 disposed at one end of the first abutment portion 31, and a first extension portion 33 disposed at the other end of the first abutment portion 31. The first abutment portion 31 is cylindrical, and the outer diameter of the first abutment portion 31 is the same as or slightly larger than the inner diameter of the first hole, achieving the same abutment effect as in the first embodiment. The difference is that the first abutment portion 31 is made of an elastic material, so that its sidewall can fully contact the first hole. At the same time, the first extension portion 33, which penetrates into its interior, can also provide lateral support for the PCB's positioning. In addition, because the first abutment portion 31 is made of an elastic material, if the cross-section of the first hole on the PCB is an arc, it can also provide higher stability for the installation of the stator lower cover. The first support portion 32 has a tapered structure that is larger at the top and smaller at the bottom. The top of the first support portion 32 is connected to the bottom of the first abutment portion 31. The diameter of the top of the first support portion 32 is the same as the diameter of the first extension portion 33, and both diameters are smaller than the outer diameter of the first abutment portion 31. The tapered design of the first support portion 32 allows the first column 3a to enter the first hole more smoothly when installing the stator lower cover. Furthermore, to reduce damage to the stator end caused by the first support portion 32, a pad can be added to its bottom, and the pad abuts against the end face of the stator. Figure 5 As shown. When the first post 3a is inserted into the first hole, the first abutting part 31 can fully fill the first hole, and the side wall of the first abutting part 31 abuts against the inner wall of the first hole. Because in this embodiment, the side wall of the first abutting part 31 can fully contact the inner wall of the first hole, the aforementioned partial contact situation will not occur. Therefore, when designing the PCB, the number of holes can be reduced, and the saved space can be used for circuit layout and circuit optimization. The first abutting part 31 is connected to the stator lower cover through the first extension part 33, which is used to connect to the stator lower cover.
[0035] In the above embodiments, the first abutment 31 is still a cylindrical structure, which has the advantage of only generating radial force on the PCB to limit the PCB. In actual applications, in addition to the rotation of the motor at the moment of startup causing the PCB to rotate, the vibration of the motor during operation will also cause the PCB to wobble axially. Therefore, in the third embodiment, we have further optimized the column. In this embodiment, the outer diameter of the column is adapted to the inner diameter of the hole. The hole is the second hole, and the column is the second column 4a. The second hole is a tapered hole with a larger upper part and a smaller lower part. The second column 4a consists of a tapered second abutment 41 adapted to the second hole, a second support 42 provided at one end of the second abutment 41, and a second extension 43 provided at the other end of the second abutment 41. The second abutment 41 can still be made of an elastic element. The tapered design of the second abutment 41 allows the second abutment 41 to better enter the second hole during installation, and disassembly is more convenient compared to the second embodiment. The tapered design of the second abutment part 41 not only allows its outer surface to fit well against the inner wall of the second hole, but also provides axial pressure to the PCB after the stator lower cover is installed, reducing PCB shaking caused by vibration. The bottom of the second support part 42 abuts against the end face of the stator. The second support part 42 also adopts a tapered structure design, and its top diameter is not greater than the bottom diameter of the second abutment part 41. Figure 6 As shown, this facilitates the entry of the second post 4a into the second hole while reducing the contact area with the stator end, thereby reducing the energy transmitted from the stator vibration to the PCB via the second support part 42. The side wall of the second abutting part 41 abuts against the inner wall of the second hole. The second abutting part 41 is connected to the stator lower cover via the second extension part 43. A pad is provided at the bottom of the second support part 42.
[0036] In the above embodiments, we have improved the column's ability to limit the PCB by optimizing its design. In this embodiment, we provide another optimization approach, namely, the outer diameter of the column is smaller than the inner diameter of the hole. The hole is the third hole, and the post is the third post 5a. A tapered groove, smaller at the top and larger at the bottom, is provided near the opening of the third hole. A first filler 6 is provided inside the third hole, consisting of a third abutment part 61 that abuts against the inner wall of the third hole, a third support part 62 located at one end of the third abutment part 61, and a third extension part 63 located at the other end of the third abutment part 61. The outer wall of the third support part 62 is tapered, smaller at the top and larger at the bottom, to match the tapered groove. The first filler 6 is fixed to the bottom of the PCB via the third support part 62. The third extension part 63 fixes the first filler 6 to the PCB from the top. Depending on the opening method of the third hole, the connection method between the third extension part 63 and the third abutment part 61 is also different. For example, when the cross-section of the third hole is semi-circular, the third extension part 63 can be integrated with the third abutment part 61. Figure 8 As shown; when the cross-section of the third hole is an arc on the PCB, the third extension 63 can be made into a separate structure with the third abutment 61 to facilitate the connection between the first filler 6 and the third hole on the PCB. Regardless of the connection method, the diameter of the bottom of the third extension 63 is larger than the diameter of the top of the third abutment 61, so that the third extension 63 can protrude beyond the PCB, effectively preventing the third post 5a from damaging the PCB when it is installed.
[0037] In this embodiment, the diameter of the third post 5a is smaller than that of the third hole. Therefore, during production, the outer diameter of the third post 5a and the inner diameter of the third abutment 61 can be the same. Since the first filler 6 exists as a modular accessory, it can be processed separately to ensure that its outer wall can fit the inner wall of the third hole and its inner wall can fit the outer wall of the third post 5a, which is convenient for processing. In order to facilitate the insertion of the third post 5a with the same outer diameter as the inner diameter of the third abutment 61, the third abutment 61, the third support 62, and the third extension 63 are all hollow structures.
[0038] Alternatively, material can be filled into the third abutment portion 61 to fill the gap between the third column 5a and the first filler 6. This can further reduce the requirement for the inner diameter machining accuracy of the first filler 6. The bottom of the third support portion 62 abuts against the stator end, and the bottom of the third extension portion 63 abuts against the top surface of the PCB. A second filler 64 with an insertion hole is provided inside the third support portion 62. The second filler 64 can be an elastic element. The third column 5a is inserted into the third hole through the first filler 6. The insertion hole design serves two purposes: first, to prevent the first filler 6 from being sealed, thus preventing the third column 5a from being inserted; second, to allow the bottom of the third column 5a to be fitted with a plug adapted to the insertion hole, so that the third column 5a can abut against the stator end face through the second filler 64, increasing the axial pressure on the PCB.
[0039] The third column 5a can also be lengthened so that it abuts against the second filler 64 after being inserted into the first filler 6. The second filler 64 is designed so that the outer wall of the third column 5a does not abut against the inner wall of the third abutment part 61. By increasing the length of the third column 5a, after the stator lower cover is installed, the third column 5a deforms the second filler 64, thereby connecting the third column 5a with the first filler 6 through the second filler 64, and thus limiting the third hole through the first filler 6.
[0040] In the first four embodiments, the column is part of the stator lower cover and is fixedly connected to it. In this embodiment, we provide a design where the column and the stator lower cover are separate. In this embodiment, the outer diameter of the column is smaller than the inner diameter of the hole. The hole is the fourth hole, the column is the fourth column 7a, and the stator lower cover has a slot for engaging the fourth column 7a. The fourth column 7a is T-shaped, and its top is used to engage with the slot of the stator lower cover. The fourth column 7a is a threaded column, and the fourth hole is a cylindrical hole. A fourth support part 8 is provided between the fourth hole and the stator end. The bottom of the fourth support part 8 abuts against the stator end, and the top of the fourth support part 8 abuts against the bottom of the PCB. The top of the fourth support part 8 is provided with an extension to the fourth hole. A fourth extension 9 is provided inside the hole. The height of the fourth extension 9 is less than the depth of the fourth hole, and the outer diameter of the fourth extension 9 is less than the inner diameter of the fourth hole. A threaded hole adapted to the fourth post 7a is provided at the top of the fourth extension 9. A fourth abutment 10 is sleeved on the outside of the fourth extension 9. The fourth abutment 10 is an elastic element, and its height is greater than the depth of the fourth hole. The top of the fourth abutment 10 selectively abuts against the top of the fourth post 7a. In this embodiment, the machining difficulty is transferred to the slot machining of the stator lower cover. In application, such as... Figure 10The steps shown involve first placing the fourth support portion 8 at the end of the stator and positioning the fourth extension portion 9 within the fourth hole, then fitting the fourth abutment portion 10 onto the fourth extension portion 9, as shown. Figure 10 During the process from A to B, the outer wall of the fourth abutment 10 can abut against the inner wall of the fourth hole, or a gap can be left. Then, the fourth post 7a is threadedly connected to the fourth extension 9. As the fourth post 7a moves into the fourth extension 9, its T-shaped top will press downwards against the fourth abutment 10, deforming it and filling the fourth hole, as shown. Figure 10 As shown in sections B to C. Finally, put on the stator lower cover, allowing the top of the fourth column 7a to engage with the slot in the stator lower cover. This embodiment, through the separate design of the fourth column 7a and the stator lower cover, prevents the fourth column 7a from bumping into the PCB during installation, thus avoiding damage to the PCB. Furthermore, because it is entirely modularly manufactured, it can be used with a wider range of PCB types, especially suitable for holes with a superior arc cross-section on the PCB. The separate design effectively prevents the columns on the stator lower cover from tilting or breaking due to installation errors.
[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0043] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A method for fixing a motor stator, characterized in that, include: At least one third hole is provided on the PCB (1) connected to the stator; At least one third post (5a) adapted to the third hole is provided on the inner surface of the stator lower cover connected to the stator. The outer diameter of the third column (5a) is smaller than the inner diameter of the third hole; The third hole is provided with a tapered groove that is smaller at the top and larger at the bottom near the opening of the stator. The third hole is provided with a first filling member (6), which consists of a third abutting part (61) that abuts against the inner wall of the third hole, a third supporting part (62) located at one end of the third abutting part (61), and a third extension part (63) located at the other end of the third abutting part (61). The outer wall of the third support part (62) is a cone shape that is smaller at the top and larger at the bottom, which is adapted to the tapered groove; The third abutment part (61), the third support part (62) and the third extension part (63) are all hollow structures; The bottom of the third support (62) abuts against the stator end, and the bottom of the third extension (63) abuts against the top surface of the PCB (1). The third support (62) is provided with a second filler (64) with a socket. When the stator lower cover is connected to the stator, the third column (5a) is inserted into the third hole through the first filler (6) so that the first filler (6) is fixed in the third hole and a positioning and support is formed between the PCB (1) and the stator.
2. The method for fixing the motor stator according to claim 1, characterized in that: The diameter of the bottom of the third extension (63) is greater than the diameter of the top of the third abutment (61) so that the third extension (63) protrudes outside the PCB (1) and the third post (5a) is prevented from damaging the PCB (1) when the third post (5a) is installed.
3. The method for fixing the motor stator according to claim 1, characterized in that: The first filler (6) is processed separately as a modular accessory so that the outer wall of the first filler (6) fits the inner wall of the third hole and its inner wall fits the outer wall of the third column (5a).
4. The method for fixing the motor stator according to claim 1, characterized in that: The second filler (64) is an elastic element.
5. The method for fixing the motor stator according to claim 1 or 4, characterized in that: The insertion hole of the second filler (64) is used for the insertion of the third post (5a) to avoid the first filler (6) being sealed, which would prevent the third post (5a) from being inserted.
6. The method for fixing the motor stator according to claim 1 or 4, characterized in that: The third column (5a) is inserted into the first filler (6) and then abuts against the second filler (64) to increase the axial pressure of the PCB (1).