electric machine

Abstract

The utility model provides a kind of motor, it is related to the technical field of motor, the utility model provides the motor comprising: casing and stator, casing includes the first chamber with first opening, stator is with the interference fit of first chamber.Assembling stator and casing can be carried out using conventional interference assembly mode when processing, for example, using the cooling of stator to make its volume reduction, then with casing assembly, stator temperature rises after restoring original volume, to complete the interference fit with casing.By using the interference fit mode to connect casing and stator, the pain point that must be fixed by screwing in the prior art is solved;Realized more rapid automatic assembly, while avoiding a series of potential risks brought by screw connection;Production efficiency is improved, and raw material cost and processing cost are reduced.

Description

Technical Field

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

[0002] As a widely used power device in modern industry, the structural design and assembly process of electric motors directly affect their performance and reliability. In traditional motor structures, the stator is primarily connected to the motor housing using screw fastening. This connection method has been used in motor assembly for decades, resulting in mature process specifications and technical standards. Screw connections provide reliable mechanical strength and facilitate disassembly and maintenance, thus they are widely used in various types of motor products.

[0003] In screw connection processes, precise threaded holes are typically machined into the motor housing, and through holes are provided at corresponding positions on the stator end face. Multiple screws are then evenly distributed to secure the stator. This connection method involves several technical aspects, including screw selection, thread machining accuracy, and tightening torque control. During production, strict control over the screw material properties, surface treatment processes, and the tightening sequence and torque parameters during assembly is essential to ensure the reliability of the connection.

[0004] However, this traditional screw connection method has many inherent drawbacks in practical applications. First, screws are prone to hydrogen embrittlement during manufacturing. This microscopic defect can cause sudden screw breakage during subsequent use and is difficult to detect through conventional testing methods. Second, uneven torque can easily occur when multiple screws are tightened, leading to an unbalanced stress distribution in the stator assembly. Furthermore, the screw connection process is cumbersome, requiring individual tightening and inspection, significantly impacting production efficiency and cycle time. Regarding environmental adaptability, moisture and corrosive media can easily accumulate at screw connection points, potentially causing corrosion over long-term use. From a manufacturing process perspective, the high precision required for the threaded holes on the motor housing increases manufacturing costs and process complexity. Utility Model Content

[0005] The purpose of this invention is to provide an electric motor that alleviates the aforementioned technical problems caused by the connection between the stator and housing of existing electric motors using screws.

[0006] In a first aspect, the present invention provides an electric motor comprising: a housing and a stator, wherein the housing includes a first chamber having a first opening, and the stator is interference-fitted with the first chamber.

[0007] Furthermore, the housing includes a base plate and a first perimeter, the first perimeter being connected to the base plate, and the inner wall of the first perimeter and one side of the base plate forming the first cavity.

[0008] Furthermore, the shape of the first perimeter is consistent with the shape of the circumferential outer wall of the stator, so that the inner wall of the first perimeter fits against the circumferential outer wall of the stator.

[0009] Furthermore, the first perimeter is provided with a plurality of through holes penetrating its inner and outer walls, the through holes forming heat dissipation holes.

[0010] Furthermore, one of the through holes is provided for the connectors of the control circuit board to pass through when they are electrically connected to the outside.

[0011] Furthermore, the motor also includes a motor shaft and a rotor, the motor shaft being located within the first cavity and integrally formed with the housing; The rotor is rotatably connected to the motor shaft.

[0012] Furthermore, the housing has a bearing seat for fixing the motor shaft, and a reinforcing rib is provided between the bearing seat and the first surrounding edge.

[0013] Furthermore, the motor also includes a control circuit board; The other side of the base plate is provided with a second perimeter, and the inner wall of the second perimeter and the other side of the base plate form a second cavity, and the control circuit board is located in the second cavity; The stator is provided with three-phase wire terminals; The base plate is provided with through holes on both sides to allow the three-phase wire terminals to pass through and be electrically connected to the control circuit board.

[0014] Furthermore, a connecting pipe is provided in the first chamber, with one end communicating with the through hole and the other end extending away from the base plate. The outer wall of the three-phase wire terminal is wrapped with a sealing ring, and the sealing ring abuts against the inner wall of the connecting pipe.

[0015] Furthermore, the sidewall of the base plate is provided with multiple mounting holes.

[0016] This utility model has at least the following advantages or beneficial effects: The motor provided by this utility model includes: a housing and a stator, wherein the housing includes a first chamber having a first opening, and the stator is interference-fitted with the first chamber.

[0017] During processing, the stator and housing can be assembled using a conventional interference fit method. For example, the stator can be cooled to reduce its volume, then assembled with the housing. As the stator's temperature rises, it returns to its original volume, thus achieving an interference fit with the housing. By using an interference fit to connect the housing and stator, the pain point of existing technologies that require screws for fixing is solved; faster automated assembly is achieved, while avoiding a series of potential risks associated with screw connections; production efficiency is improved, and raw material and processing costs are reduced. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the front of the motor provided in an embodiment of this utility model (rotor not shown). Figure 2 A schematic diagram of the back of the motor provided in an embodiment of this utility model (rotor not shown). Figure 3 A schematic diagram of the front of the motor housing provided in an embodiment of this utility model; Figure 4 A schematic diagram of the back of the motor housing provided for an embodiment of this utility model; Figure 5 A schematic diagram of the stator of the motor provided in an embodiment of this utility model.

[0020] Icons: 11-First perimeter; 111-Through hole; 12-Second perimeter; 13-Base plate; 131-Through hole; 14-Shaft seat; 15-Reinforcing rib; 16-Connecting pipe; 17-Mounting hole; 2-Stator; 21-Three-phase terminal; 22-Sealing ring; 3-Motor shaft; 4-Control circuit board. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figures 1-5 As shown, the motor provided by this utility model can be used in, but is not limited to, fans.

[0028] The motor includes a housing, a rotor, a stator, and a cover plate.

[0029] The housing includes a base plate 13, and the front of the base plate 13 is provided with a first perimeter 11 protruding towards its front side. The inner wall of the first perimeter 11 and one side of the base plate 13 form a first chamber, and the opening of the first chamber faces the front side. The stator 2 is interference-fitted with the first chamber.

[0030] During processing, the stator 2 can be assembled with the housing using a conventional interference fit method. For example, the stator 2 can be cooled to reduce its volume, then assembled with the housing. As the stator 2 heats up, it returns to its original volume, thus achieving an interference fit with the housing. By using an interference fit to connect the housing and stator 2, the pain point of requiring screws for fixing in existing technologies is solved; faster automated assembly is achieved, while avoiding a series of potential risks associated with screw connections; production efficiency is improved, and raw material and processing costs are reduced.

[0031] To increase the contact surface of the interference fit and improve the connection strength, the shape of the first perimeter 11 is consistent with the shape of the circumferential outer wall of the stator 2. For example, if there is a protruding structure on the circumferential outer wall of the stator 2, a recessed structure is provided at the corresponding position on the inner wall of the first perimeter 11. The concave and convex structures correspond to each other so that the inner wall of the first perimeter 11 fits the circumferential outer wall of the stator 2 more closely.

[0032] like Figure 1 and Figure 3 As shown, the first perimeter 11 has multiple through holes 111 penetrating its inner and outer walls to form heat dissipation holes. One of the heat dissipation holes also serves as a through hole for the connector of the motor's control circuit board to connect to external electrical components.

[0033] like Figure 3 As shown, the motor also includes a motor shaft 3, which is located within the first chamber and integrally formed with the housing; the rotor is rotatably connected to the motor shaft 3. The housing is formed by injection molding, during which the motor shaft 3 is placed into the mold, thus the housing and motor shaft 3 are integrally formed. This changes the motor shaft 3 from the original rotor part to the stator 2 part, with the motor shaft 3 and housing integrally formed. This solves the problem that during the subsequent assembly of the motor shaft 3 and the impeller, process holes must be opened on the center of the base plate 13, the cover plate, and the control circuit board 4, which prevents the second chamber (used to accommodate the control circuit board 4) from forming an effective seal, thus failing to achieve IP6K7 or higher levels of waterproofing and dustproofing.

[0034] like Figure 3As shown, the housing has a bearing seat 14 for fixing the motor shaft 3. The bearing seat 14 is part of the housing, and its top surface is higher than the base plate 13, thereby providing a stable enclosure for the motor shaft 3. A reinforcing rib 15 is provided between the bearing seat 14 and the first surrounding edge 11, thereby increasing the strength of the base plate 13 and reducing vibration.

[0035] like Figure 4 As shown, the motor also includes a control circuit board 4; a second perimeter 12 is provided on the back of the base plate 13, and the inner wall of the second perimeter 12 and the other side of the base plate 13 form a second cavity. The control circuit board 4 is located in the second cavity. After the cover is connected to the housing, the second cavity is sealed.

[0036] like Figure 3 and Figure 5 As shown, the stator 2 is provided with three-phase wire terminals 21; the base plate 13 is provided with through holes 131 penetrating both sides, so that the three-phase wire terminals 21 can pass through and be electrically connected to the control circuit board 4.

[0037] To improve the sealing of the second chamber, a connecting pipe 16 is provided in the first chamber, with one end communicating with the through hole 131 and the other end extending away from the base plate 13. The outer wall of the three-phase terminal 21 is wrapped with a sealing ring 22, which abuts against the inner wall of the connecting pipe 16.

[0038] like Figure 1 As shown, the side wall of the base plate 13 is provided with multiple mounting holes 17. The multiple mounting holes 17 share the connection pressure, reducing the pressure on each mounting hole 17, and the motor is connected to external components through the mounting holes 17.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric motor, characterized in that, include: The housing and the stator (2), the housing including a first chamber having a first opening, the stator (2) being interference-fitted with the first chamber.

2. The motor according to claim 1, characterized in that, The housing includes a base plate (13) and a first perimeter (11), the first perimeter (11) being connected to the base plate (13), and the inner wall of the first perimeter (11) and one side of the base plate (13) forming the first chamber.

3. The motor according to claim 2, characterized in that, The shape of the first perimeter (11) is consistent with the shape of the circumferential outer wall of the stator (2) so that the inner wall of the first perimeter (11) fits against the circumferential outer wall of the stator (2).

4. The motor according to claim 2, characterized in that, The first perimeter (11) is provided with a plurality of through holes (111) penetrating its inner and outer walls, and the through holes (111) form heat dissipation holes.

5. The motor according to claim 4, characterized in that, One of the through holes (111) is provided for the connectors of the control board to pass through when they are electrically connected to the outside.

6. The motor according to claim 2, characterized in that, The motor also includes a motor shaft (3) and a rotor. The motor shaft (3) is located in the first cavity and is integrally formed with the housing. The rotor is rotatably connected to the motor shaft (3).

7. The motor according to claim 6, characterized in that, The housing has a bearing seat (14) for fixing the motor shaft (3), and a reinforcing rib (15) is provided between the bearing seat (14) and the first perimeter (11).

8. The motor according to claim 7, characterized in that, The motor also includes a control circuit board (4); The other side of the base plate (13) is provided with a second perimeter (12), and the inner wall of the second perimeter (12) and the other side of the base plate (13) form a second cavity, and the control circuit board (4) is located in the second cavity; The stator (2) is provided with three-phase wire terminals (21); The base plate (13) is provided with through holes (131) that penetrate both sides of it, so that the three-phase wire terminals (21) can pass through and be electrically connected to the control circuit board (4).

9. The motor according to claim 8, characterized in that, The first chamber is provided with a connecting pipe (16) with one end connected to the through hole (131) and the other end extending away from the bottom plate (13). The outer wall of the three-phase terminal (21) is wrapped with a sealing ring (22), and the sealing ring (22) abuts against the inner wall of the connecting pipe (16).

10. The motor according to claim 2, characterized in that, The sidewall of the base plate (13) is provided with multiple mounting holes (17).

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