Motor housing and motor

Abstract

The application provides a motor shell and a motor. The motor shell comprises: a shell, a threaded connection hole is arranged on the shell; an end cover, the end cover is arranged on the end of the shell, a light hole corresponding to the threaded connection hole is arranged on the end cover, the length of the light hole is h1, the expansion coefficient of the end cover is k1; a sealing structure, the sealing structure comprises a sealing gasket, the sealing gasket is arranged between the shell and the end cover, a through hole is arranged on the sealing gasket, the thickness of the sealing gasket is h2, and the expansion coefficient of the sealing gasket is k3; a threaded connecting piece, the threaded connecting piece comprises a light rod section and a screw rod section, the light rod section is arranged in the light hole and the through hole, the screw rod section is arranged in the threaded connection hole, and the expansion coefficient of the threaded connecting piece is k2; wherein k3*h2>=k2*(h1+h2)-k1*h1. According to the motor shell, the sealing performance of the motor can be improved, and the sealing effect of the motor under a high-temperature working environment can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine shell and an electric machine. BACKGROUND

[0002] Electric machines are not only the core power equipment of modern industry, but also have a profound impact on our daily life and human social progress. Its impact on daily life lies in the improvement of convenience, comfort and efficiency, while its impact on human development lies in technological progress, leap of social productivity and promotion of sustainable development.

[0003] Electric machines drive industrial revolution and technological progress. The invention and application of electric machines is one of the important symbols of the second industrial revolution, which promotes the transition from steam power to electric power drive. The progress of electric machine technology promotes the perfection of the electric power system and the formation of the modern industrial system.

[0004] Electric machines promote the leap of social productivity. The widespread application of electric machines makes the production process more automated and efficient, greatly improving the efficiency of industrial production. Through technologies such as robots and automated equipment, electric machines further liberate human labor and promote the improvement of productivity.

[0005] Electric machines promote the development of modern transportation and communication. Electrically driven vehicles (such as cars, trains, and airplanes) have completely changed the way people travel, shortening the spatial distance. The application of electric machines in communication equipment (such as servers and base stations) ensures power supply and promotes the arrival of the information age.

[0006] Electric machines contribute to sustainable development. The application of electric machines in the field of new energy (such as wind power and solar power) promotes the development and utilization of clean energy. The promotion of efficient electric machines and intelligent control systems (such as frequency conversion technology) greatly reduces energy consumption and carbon emissions.

[0007] Electric machines promote human exploration and innovation. In the fields of space exploration and deep sea exploration, electrically driven equipment provides technical support for human exploration of the unknown world. In the medical field, electrically driven precision equipment (such as surgical robots) promotes the progress of medical technology.

[0008] Due to the progress of technology, the use of many electric machines is becoming more and more demanding, and the waterproof requirements of electric machines are becoming more and more stringent. Especially in the application on vehicles, the waterproof requirement of electric machines reaches IP68. The current sealing of electric machines generally uses the method of applying glue to achieve the sealing requirement, but the silicone glue is easy to age and the application is troublesome. After the end cover is applied, the glue is easy to squeeze out of the outside, and the high temperature environment during the operation of the electric machine is more likely to cause the aging of the silicone glue, reducing the sealing performance of the electric machine. SUMMARY

[0009] The motor shell and the motor can improve the sealing performance of the motor and ensure the sealing effect of the motor in a high-temperature working environment.

[0010] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a motor shell is provided, comprising:

[0011] A machine shell is provided with a threaded connection hole;

[0012] An end cover is arranged at the end of the machine shell, and a light hole corresponding to the threaded connection hole is arranged on the end cover, the length of the light hole is h1, and the expansion coefficient of the end cover is k1;

[0013] A sealing structure comprises a sealing gasket arranged between the machine shell and the end cover, a through hole is arranged on the sealing gasket, the thickness of the sealing gasket is h2, and the expansion coefficient is k3;

[0014] A threaded connecting piece comprises a light rod section and a screw rod section, the light rod section is arranged in the light hole and the through hole, the screw rod section is arranged in the threaded connection hole, and the expansion coefficient of the threaded connecting piece is k2;

[0015] Wherein, k3×h2≥k2×(h1+h2)-k1×h1.

[0016] Further, k3>k1, k3>k2.

[0017] Further, 1mm≤h2≤2mm.

[0018] Further, the sealing structure further comprises a sleeve, the sleeve is an insulating structure, the sleeve is located on the inner circumferential side of the sealing gasket and extends axially from the end face of the sealing gasket, and the sleeve is sleeved on the inner circumferential wall of the machine shell.

[0019] Further, an iron core mounting position is arranged in the machine shell, and the sleeve extends to the iron core mounting position.

[0020] Further, the end cover is provided with a stop structure, the stop structure extends into the machine shell, and the sleeve is located between the outer circumferential wall of the stop structure and the inner circumferential wall of the machine shell.

[0021] Further, the outer diameter of the sleeve is R1, the inner diameter is R4, the inner diameter of the machine shell is R2, the outer diameter of the stop structure is R3, k1×R3×△T1+△L1≤k3×R4×△T1≤k1×R3×△T1+△L1+△L2, wherein △T1 is the temperature rise, △T1 is the temperature rise, △T1=T1-T, T1 is the current working temperature of the machine shell, T is the normal temperature, the value range of △L1 is 0-0.09mm, and the value range of △L2 is 0.002mm~0.067mm.

[0022] Further, △L2 is selected from P7 / h6, R7 / h6, S7 / h6, T7 / h6, and U7 / h6.

[0023] According to another aspect of the present application, there is provided an electric machine comprising an electric machine housing, the electric machine housing being the electric machine housing described above.

[0024] Further, the electric machine further comprises a stator assembly arranged in the electric machine housing, the stator assembly comprising a stator core and a stator winding, and the sealing structure comprises a sleeve, the sleeve extending to an end face of the stator core.

[0025] Further, the stator winding comprises an end winding, the sleeve is arranged between the end winding and the machine housing, and a gap x between the end winding and the sleeve is 0≤x≤0.5mm.

[0026] By controlling the relationship between the expansion coefficients and the sizes of the end cover, the sealing structure and the threaded connecting piece, the sealing gasket of the sealing structure can effectively compensate for the sealing gap that may be caused by the different expansion amounts of the threaded connecting piece and the end cover during temperature changes, ensuring the sealing effect between the end cover and the machine housing. During the operation of the electric machine, as the temperature rises, the sealing gasket expands with an expansion coefficient k. This expansion can compensate for the thermal expansion of the threaded connecting piece and the end cover, ensuring that the contact pressure between the sealing gasket and the machine housing and the end cover remains or increases, thereby maintaining or even enhancing the sealing performance of the electric machine housing, effectively preventing moisture from entering and keeping the interior clean. At the same time, by precisely controlling the expansion amounts of the various components, structural looseness or damage caused by thermal expansion and contraction is avoided, ensuring that the electric machine can operate stably under various environmental conditions, achieving efficient waterproofing and durability. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which form a part of this description, are included to provide further understanding of the application, and are incorporated in and constitute a part of this application. The illustrative embodiments of the application and their description serve to explain the application. They do not, however, limit the scope of the application. In the drawings:

[0028] Fig. 1 FIG. 1 shows a structural schematic diagram of a sealing structure of an embodiment of the present application;

[0029] Fig. 2 FIG. 2 shows a sectional structural schematic diagram of the sealing structure of the embodiment of the present application;

[0030] Fig. 3 FIG. 3 shows an assembly structural schematic diagram of a machine housing and an end cover of the embodiment of the present application;

[0031] Fig. 4 FIG. 4 shows an assembly structural schematic diagram of a stator core, a machine housing, an end cover and a sealing structure of the embodiment of the present application.

[0032] In the above drawings, the following reference signs are used:

[0033] 1, casing; 2, threaded connection hole; 3, end cover; 4, light hole; 5, sealing structure; 6, sealing gasket; 7, through hole; 8, threaded connecting piece; 9, light rod section; 10, screw rod section; 11, sleeve; 12, stop structure; 13, stator core; 14, end winding. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] In combination with Figs. 1 to 4 As shown in the figure, according to the embodiment of the present application, the motor shell comprises: a casing 1, the casing 1 is provided with a threaded connection hole 2; an end cover 3, the end cover 3 is arranged at the end of the casing 1, the end cover 3 is provided with a light hole 4 corresponding to the threaded connection hole 2, the length of the light hole 4 is h1, the expansion coefficient of the end cover 3 is k1; a sealing structure 5, comprising a sealing gasket 6, the sealing gasket 6 is arranged between the casing 1 and the end cover 3, the sealing gasket 6 is provided with a through hole 7, the thickness of the sealing gasket 6 is h2, the expansion coefficient is k3; a threaded connecting piece 8, comprising a light rod section 9 and a screw rod section 10, the light rod section 9 is arranged in the light hole 4 and the through hole 7, the screw rod section 10 is installed in the threaded connection hole 2, the expansion coefficient of the threaded connecting piece 8 is k2; wherein k3×h2≥k2×(h1+h2)-k1×h1.

[0036] In this embodiment, by controlling the relationship between the expansion coefficient and the size of the end cover 3, the sealing structure 5 and the threaded connecting piece 8, the sealing gasket 6 of the sealing structure 5 can effectively compensate for the sealing gap that may be caused by the different expansion amounts of the threaded connecting piece 8 and the end cover 3 during temperature changes, ensuring the sealing effect between the end cover 3 and the casing 1. During the operation of the motor, as the temperature rises, the sealing gasket 6 expands with an expansion coefficient k3. This expansion can compensate for the thermal expansion of the threaded connecting piece 8 and the end cover 3, ensuring that the contact pressure between the sealing gasket 6 and the casing 1 and the end cover 3 remains or increases, thereby maintaining or even enhancing the sealing performance of the motor shell, effectively preventing moisture from entering and keeping the interior clean. At the same time, by precisely controlling the expansion amount of each component, structural looseness or damage caused by thermal expansion and contraction is avoided, ensuring that the motor can operate stably under various environmental conditions, achieving efficient waterproofing and durability.

[0037] In one embodiment, k3>k1, k3>k2.

[0038] By the above definition, the expansion coefficient of the sealing gasket 6 is higher than that of the end cover 3 and the threaded connection 8, so that the sealing gasket 6 can expand more fully and form a tighter seal when the motor is running. The higher expansion coefficient allows the sealing gasket 6 to have a greater amount of thermal expansion, so that when the temperature of the motor rises, the expansion amount of the sealing gasket 6 exceeds the difference in expansion amount between the end cover 3 and the threaded connection 8, ensuring tight contact of the sealing plane, thereby enhancing the waterproof performance of the motor, and keeping the interior of the motor dry and clean even under extreme temperature conditions.

[0039] In one embodiment, 1 mm≤h2≤2 mm.

[0040] This embodiment limits the thickness range of the sealing gasket 6 to ensure that the sealing gasket 6 can produce sufficient expansion amount to compensate for the expansion of other components when the motor is running, while avoiding excessive expansion that can cause structural damage. The thickness of the sealing gasket 6 directly affects its sealing effect after expansion, and a reasonable thickness range can balance the sealing performance and structural stability. By the above size limitation, the motor can both ensure the sealing effect by the expansion of the sealing gasket 6 when running and not cause excessive pressure to other components, thus prolonging the service life of the motor. In other embodiments, the sealing effect and overall structural design of the motor can also be optimized by adjusting the specific value of h2.

[0041] In this embodiment, the part of the end cover 3 that cooperates with the light rod section 9 of the threaded connection 8 is the light hole 4, which extends through the end cover 3 in the axial direction, and the part of the housing 1 that cooperates with the screw rod section 10 of the threaded connection 8 is the threaded connection hole 2. The length of the light hole 4 on the end cover 3 is h1, and the thickness of the sealing gasket 6 of the sealing structure 5 is h2. Because the part of the screw rod section 10 of the threaded connection 8 that cooperates with the housing 1 is a threaded fit, the screw rod section 10 hardly expands when the temperature of the motor rises. However, because the part of the light rod section 9 of the threaded connection 8 that cooperates with the light hole 4 of the end cover 3 is a clearance fit, the upper part of the light rod section 9 of the threaded connection 8 will expand due to heat, and the length of this part of the light rod section 9 that expands is h1+h2.

[0042] Assuming the expansion coefficient of the end cover 3 is k1, the expansion coefficient of the threaded connection 8 is k2, and the expansion coefficient of the protective structure is k3. The normal temperature of the motor in the non-working state is T, generally 23±2℃, and the temperature of the motor during normal operation is T1. The temperature rise △T1=T1-T from the normal temperature T to the temperature T1 of the motor during normal operation. The expansion amount of the light rod section 9 of the threaded connection 8 is k2×(h1+h2)×△T1; the expansion amount of the end cover 3 is k1×h1×△T1; and the expansion amount of the sealing gasket 6 of the sealing structure 5 is k3×h2×△T1. The thickness h2 is related to the expansion amounts of the threaded connection 8 and the end cover 3, and needs to ensure that the expansion amount of the sealing gasket 6 of the sealing structure 5 is greater than the difference between the expansion amount of the light rod section 9 of the threaded connection 8 and the expansion amount of the end cover 3. In this way, the expansion effect of the sealing structure 5 can compensate for the difference between the expansion amounts of the end cover 3 and the threaded connection 8, and ensure the tight sealing between the casing 1 and the end cover 3. Therefore, the structural design of the sealing structure 5 needs to satisfy k3×h2×△T1≥k2×(h1+h2)×△T1-k1×h1×△T1. After removing the common factor △T1 in the formula, the formula k3×h2≥k2×(h1+h2)-k1×h1 is obtained.

[0043] When the expansion amount of the light rod section 9 is greater than the expansion amount of the end cover 3, the outward expansion amplitude of the light rod section 9 is greater than the amplitude of the end cover 3. If the thickness of the sealing gasket 6 remains unchanged, the length value of the light rod section 9 is greater than the sum of the thickness of the sealing gasket 6 and the thickness of the end cover 3, which will cause the end cover 3 to have a certain amount of movement, and the threaded connection 8 cannot effectively seal the end cover 3 and the casing 1. At this time, it is only necessary to ensure that the sealing gasket 6 also expands, and the expansion amount is greater than the difference between the expansion amount of the light rod section 9 and the expansion amount of the end cover 3, so as to compensate for the gap that may be caused by the different expansion amounts of the light rod section 9 and the end cover 3, and ensure the sealing effect between the end cover 3 and the casing 1.

[0044] When the expansion amount of the light rod section 9 is less than or equal to the expansion amount of the end cover 3, the outward expansion amplitude of the light rod section 9 is less than the amplitude of the end cover 3. At this time, even if the thickness of the sealing gasket 6 remains unchanged, since the expansion amplitude of the light rod section 9 is less than the expansion amplitude of the end cover 3, the expanded part of the end cover 3 is pressed against the sealing gasket 6 under the limiting action of the bolt head of the light rod section 9, thereby ensuring the sealing effect between the casing 1 and the end cover 3. At this time, even if the sealing gasket 6 does not expand, the sealing effect can also be ensured. The expansion of the sealing gasket 6 can further ensure the sealing effect between the casing 1 and the end cover 3.

[0045] In one embodiment, the sealing structure 5 further includes a sleeve 11, which is an insulating structure. The sleeve 11 is located on the inner circumferential side of the sealing gasket 6 and extends axially from the end face of the sealing gasket 6. The sleeve 11 is sleeved on the inner circumferential wall of the casing 1.

[0046] When the motor is working, with the temperature rising, the sleeve 11 in the sealing structure 5 expands radially from the inner circumferential side of the sealing gasket 6 and closely fits on the inner circumferential wall of the motor housing 1 by virtue of its insulation and thermal expansion characteristics, further forming a seal in the axial direction of the motor housing 1, not only enhancing the sealing between the motor housing 1 and the end cover 3 to prevent the intrusion of moisture and condensed water, but also effectively maintaining the insulation distance between the wire package and the motor housing 1 due to the insulation effect of the sleeve 11, while promoting the conduction of heat inside the motor through the good thermal contact between the sleeve 11 and the motor housing 1, thereby improving the sealing performance and insulation safety of the motor, enhancing the heat dissipation effect and overall lightweight design of the motor, ensuring that the motor can still operate stably under harsh conditions such as high load and high temperature, and improving the reliability and efficiency of the motor.

[0047] In one embodiment, the sealing structure 5 includes a sealing gasket 6 and a sleeve 11, wherein the sealing gasket 6 is a square structure with a circular hole in the middle, the outer contour of the sealing gasket 6 matches the outer contour of the motor housing 1 and the end cover 3, and the inner diameter of the middle circular hole structure is consistent with the inner diameter of the sleeve 11, so that the inner wall of the middle circular hole of the sealing gasket 6 is flush with the inner wall of the sleeve 11.

[0048] In one embodiment, the motor housing 1 is provided with a core mounting position, and the sleeve 11 extends to the core mounting position.

[0049] In this embodiment, the length h4 of the sleeve 11 is related to the size of the stator core entering the housing, and the sleeve 11 is flush with the end surface of the stator core, so that the sleeve 11 can form good insulation performance between the motor housing 1 and the stator winding, and the outer diameter of the wire package of the stator winding can be infinitely close to the inner diameter R4 of the sleeve 11, which is in contact with the inner wall of the sleeve 11, so that the radial dimension of the wire package of the stator winding is as large as possible, thereby reducing the overall height of the wire package and the overall axial dimension of the motor, achieving lightweight design of the motor. And since the wire package of the motor is almost attached to the inner wall of the sleeve 11, the heat of the wire package can be transferred to the motor housing 1 through the sealing structure 5 for heat dissipation, which belongs to conduction heat dissipation, and the heat dissipation effect is better than that of air radiation conduction heat dissipation.

[0050] In one embodiment, the end cover 3 is provided with a flange structure 12, the flange structure 12 extends into the motor housing 1, and the sleeve 11 is located between the outer circumferential wall of the flange structure 12 and the inner circumferential wall of the motor housing 1.

[0051] The end cover 3 is tightly matched with the shell 1 through the setting of the stop structure 12, and the sealing performance of the motor is further enhanced. The gap between the stop structure 12 and the shell 1 is filled by the sleeve 11, and the sealing is realized by using the thermal expansion characteristics of the sleeve 11, which can effectively prevent moisture and dust from entering the motor, and improve the protection level of the motor. In other embodiments, the sealing effect of the motor can be improved by optimizing the design of the stop structure 12, and the protection problem of the motor in harsh environment can be solved.

[0052] In one embodiment, the outer diameter of the sleeve 11 is R1, the inner diameter is R4, the inner diameter of the shell 1 is R2, the stop structure 12 is cylindrical, the outer diameter of the stop structure 12 is R3, k1xR3x△T1+△L1≤k3xR4x△T1≤k1xR3x△T1+△L1+△L2, wherein △T1 is the temperature rise, △T1=T1-T, T1 is the current working temperature of the shell 1, T is the normal temperature, the value range of △L1 is 0-0.09mm, and the value range of △L2 is 0.002mm~0.067mm. Wherein △L1 is the gap, and △L2 is the interference.

[0053] Suppose the outer diameter of the sleeve 11 is R1, and the inner diameter is R4. The hole diameter of the shell 1 is R2, and the outer diameter of the stop structure 12 of the end cover 3 is R3. On the basis of the size, R1=R2, R3=R4, and the cooperation of the end cover 3 and the shell 1 is mainly controlled by the tolerance in this embodiment. At normal temperature, the cooperation between the end cover 3 and the sealing structure 5 is small gap cooperation after the installation of the sealing structure 5, so as to facilitate the installation of the end cover 3. When the motor runs and generates heat, because the expansion coefficient of the sealing structure 5 is greater than the expansion coefficient of the shell 1 and the end cover 3, it is necessary to design the final tolerance of the cooperation between the stop structure 12 of the end cover 3 and the sealing structure 5 to be interference fit, so that the shell 1 and the stop structure 12 of the end cover 3 also form a tight cooperation, which can effectively prevent water from entering the motor, and prevent the formation of condensate due to the temperature difference between the inside and the outside.

[0054] In order to ensure that the gap between the end cover 3 and the sealing structure 5 is small when the motor is installed at room temperature, the size of R1 and R2 is the same. The size of R3 and R4 is basically the same, and R3 is slightly smaller than the inner diameter R4 of the sleeve 11. The gap between the end cover 3 and the sleeve 11 is small. Assuming that the thermal expansion coefficient of the motor shell 1 is k4, the expansion amount of the inner hole of the motor shell 1 is R1*k4*△T1, and the expansion amount of the outer diameter of the sleeve 11 of the sealing structure 5 is k3*R2*△T1. Since k3 is greater than k4, the outer diameter of the sleeve 11 is always in close contact with the inner wall of the motor shell 1, which can ensure the sealing between the sleeve 11 of the sealing structure 5 and the inner wall of the motor shell 1. The expansion amount of the outer wall of the end cover 3 is k1*R3*△T1, and the expansion amount of the inner hole of the sleeve 11 of the sealing structure 5 is k3*R4*△T1. The gap between the end cover 3 and the sleeve 11 can be set as required. Assuming that the gap between the end cover 3 and the sleeve 11 is △L1, the expansion amount of the sleeve 11 is k1*R3*△T1+△L1, and k3*R4*△T1>k1*R3*△T1+△L1. Since the expansion amount should not be too large, the expansion amount is too large, which is easy to cause the deformation of the end cover 3. The motor shell 1, the sealing structure 5 and the end cover 3 are in the basic shaft structure, and the interference amount △L2 is in the range of n3-n4, and k3*R4*△T1<k1*R3*△T1+△L1+△L2.

[0055] In one embodiment, △L2 is selected from P7 / h6, R7 / h6, S7 / h6, T7 / h6 and U7 / h6, that is, P7 / h6, R7 / h6, S7 / h6, T7 / h6 and U7 / h6 are located between n3-n4.

[0056] In this embodiment, by selecting a suitable fitting tolerance, the interference fit between the sleeve 11 and the end cover 3 is ensured when the motor is running. The values of n3 and n4 determine the minimum interference amount and the maximum interference amount between the sleeve 11 and the end cover 3, so as to ensure that the motor can form a reliable seal when the temperature rises. Through the above limitation, the motor can maintain stable sealing performance even when facing a large temperature difference.

[0057] According to the embodiment of the application, the motor comprises the motor shell.

[0058] The motor of this embodiment integrates the above sealing structure 5, realizes the lightweight design and high-efficiency heat dissipation of the motor. The above design of the motor shell ensures that the motor can effectively prevent moisture from entering when the motor is running, and improves the power density of the motor through conduction heat dissipation. The motor using the above motor shell can not only maintain good sealing and insulation when running, but also effectively dissipate heat, improve the efficiency and service life of the motor.

[0059] In one embodiment, the motor further comprises a stator assembly disposed within the motor housing, the stator assembly comprising a stator core 13 and a stator winding, and the sealing structure 5 comprises a sleeve 11 extending to an end face of the stator core 13 when the sleeve 11 is disposed between the motor housing 1 and the end cover 3.

[0060] When the motor operates to generate heat, the sleeve 11 in the sealing structure 5 can effectively extend from the inner circumferential side of the sealing gasket 6 to the end face of the stator core 13 due to its higher thermal expansion coefficient than that of the motor housing 1 and the end cover 3, not only tightly fitting the inner wall of the motor housing 1 to ensure the sealing isolation of the stator assembly within the motor housing from the external environment and prevent the intrusion of moisture and contaminants, but also maintaining the effective insulation between the stator winding and the motor housing 1 at high temperatures by using the sleeve 11 with insulation structure, promoting the conduction of heat from the stator winding to the motor housing 1, and significantly improving the waterproof performance, operation safety and heat dissipation efficiency of the motor, so that the motor can operate stably in a wider operating temperature range.

[0061] In one embodiment, the sealing structure 5 is integrally formed and the entire sealing structure is made of a material with good insulation performance and high heat resistance, so as to avoid the influence of high temperature in the working state of the motor on the insulation performance of the sealing structure 5.

[0062] In one embodiment, the stator winding comprises an end winding 14, the sleeve 11 is located between the end winding 14 and the motor housing 1, and the gap x between the end winding 14 and the sleeve 11 is 0≤x≤0.5mm.

[0063] During the operation of the motor, as the temperature rises, the sleeve 11 in the sealing structure 5 can be fine-tuned and cooperate with the end winding 14, and the gap x between them is between 0 and 0.5mm, not only greatly enhancing the insulation performance of the motor to ensure high-voltage safety, but also fully utilizing the heat conduction between the sleeve 11 and the motor housing 1 to accelerate the heat dissipation of the end winding 14, while avoiding the cumbersome construction and potential aging problems of traditional insulation materials, achieving a perfect balance between lightweight design, high-efficiency heat dissipation and electrical safety of the motor, and significantly improving the operation stability and overall performance of the motor.

[0064] It is to be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. In addition, it should be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application as well as above-mentioned drawings are intended to distinguish similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of data so designated is not meant to limit a given embodiment to a specific embodiment but that the embodiments of the application described herein are amenable to modifications and adaptations of usage, structure and changes of the elements described herein, without departing from the spirit and scope of the inventive concepts disclosed and enabling a person skilled in the art to make and use many embodiments of the application just described, and literally come within the scope of the appended claims.

[0066] The preferred embodiments of the application are only used to explain the present application and not used to limit the present application. The present application can have various modifications and changes. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A motor housing, characterized in that, include: The housing (1) is provided with a threaded connection hole (2); End cap (3) is provided on the end of the housing (1). The end cap (3) has a light hole (4) corresponding to the threaded connection hole (2). The length of the light hole (4) is h1. The expansion coefficient of the end cap (3) is k1. The sealing structure (5) includes a sealing gasket (6), which is disposed between the housing (1) and the end cap (3). The sealing gasket (6) has a through hole (7), and the thickness of the sealing gasket (6) is h2 and the coefficient of expansion is k3. The threaded connector (8) includes a smooth rod section (9) and a screw section (10). The smooth rod section (9) passes through the smooth hole (4) and the through hole (7). The screw section (10) is installed in the threaded connection hole (2). The expansion coefficient of the threaded connector (8) is k2. Where, k3×h2≥k2×(h1+h2)-k1×h1.

2. The motor housing according to claim 1, characterized in that, k3 > k1, k3 > k2.

3. The motor housing according to claim 1, characterized in that, 1mm≤h2≤2mm.

4. The motor housing according to claim 1, characterized in that, The sealing structure (5) further includes a sleeve (11), which is an insulating structure. The sleeve (11) is located on the inner circumferential side of the sealing gasket (6) and extends axially from the end face of the sealing gasket (6). The sleeve (11) is fitted onto the inner circumferential wall of the housing (1).

5. The motor housing according to claim 4, characterized in that, The housing (1) is provided with a core mounting position, and the sleeve (11) extends to the core mounting position.

6. The motor housing according to claim 4, characterized in that, The end cap (3) is provided with a stop structure (12), the stop structure (12) extends into the housing (1), and the sleeve (11) is located between the outer peripheral wall of the stop structure (12) and the inner peripheral wall of the housing (1).

7. The motor housing according to claim 6, characterized in that, The outer diameter of the sleeve (11) is R1 and the inner diameter is R4. The inner diameter of the housing (1) is R2 and the outer diameter of the stop structure (12) is R3. k1×R3×△T1+△L1≤k3×R4×△T1≤k1×R3×△T1+△L1+△L2, where △T1 is the temperature rise, △T1=T1-T, T1 is the current working temperature of the housing (1), T is the room temperature, the value range of △L1 is 0-0.09mm, and the value range of △L2 is 0.002mm~0.067mm.

8. An electric motor, comprising a motor housing, characterized in that, The motor housing is the motor housing according to any one of claims 1 to 7.

9. The motor according to claim 8, characterized in that, The motor also includes a stator assembly disposed within the motor housing, the stator assembly including a stator core (13) and a stator winding, and when the sealing structure (5) includes a sleeve (11), the sleeve (11) extends to the end face of the stator core (13).

10. The motor according to claim 9, characterized in that, The stator winding includes an end winding (14), and the sleeve (11) is located between the end winding (14) and the housing (1). The gap x between the end winding (14) and the sleeve (11) is 0≤x≤0.5mm.

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