Stator assembly and motor

Abstract

The embodiment of the utility model discloses a stator assembly and a motor, and relates to the technical field of vehicles. The stator assembly comprises a stator core, an oil guide strip, a stator winding and a sealing end cover. The stator core comprises a sealing base located at the end part; the oil guide strip is matched with the sealing base to form an oil guide groove; the stator winding is fixed in the oil guide groove, and at least one winding end part of the stator winding is exposed out of the stator iron core; the sealing end cover is connected with the sealing base and is matched with the sealing base to form a cooling cavity for accommodating the end part of the winding; and the oil guide groove is communicated with the cooling cavity. The stator assembly forms a cooling oil way through the oil guide groove and the cooling cavity which are communicated with each other, and the cooling liquid passes through the cooling oil way, so that the end part of the stator winding can be immersed in the groove of the stator iron core for direct cooling, heat can be directly taken away from a heating source, the motor temperature is more effectively controlled, the motor efficiency is improved, and the service life of the motor is prolonged. And the motor is allowed to operate at a higher power density.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a stator assembly and a motor. Background Art

[0002] As the new energy market expands, competition becomes increasingly fierce, and the demands on motor products are becoming increasingly stringent. OEMs are gradually increasing their power and performance requirements for motors, and with them, higher demands on motor cooling systems. Current motor cooling systems have fully shifted from water cooling to oil cooling. Simple partial oil rings and full-circle oil spray rings can only spray the end windings and are unable to cool the interior of the core. With the newer generation of motors, these cooling systems no longer meet the increasing performance demands.

[0003] Therefore, there is an urgent need for a stator assembly and a motor to improve the cooling effect. Summary of the Invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a stator assembly and a motor, which has a connected oil guide groove and a cooling cavity, so that the end of the stator winding can be immersed and directly cooled in the slot of the stator core, thereby facilitating the direct removal of heat from the heat source, more effectively controlling the motor temperature, improving the motor efficiency, and allowing the motor to operate at a higher power density.

[0005] The present invention discloses a stator assembly, comprising:

[0006] a stator core including a sealing base at the end;

[0007] The oil guide strip cooperates with the sealing base to form an oil guide groove;

[0008] The stator winding is fixed in the oil guide groove, and at least one winding end of the stator winding is exposed from the stator core;

[0009] A sealing end cover is connected to the sealing base and cooperates with each other to form a cooling cavity for accommodating the winding end;

[0010] The oil guide groove and the cooling cavity are communicated with each other.

[0011] Furthermore, the sealing end cover is an insulating end cover, and the sealing end cover is insulated and connected to the sealing base.

[0012] Furthermore, the sealing end cover and the sealing base are glued together; or the sealing end cover and the sealing base are laser welded together.

[0013] Furthermore, the sealing base includes a plurality of wire grooves with one side opening, and the plurality of wire grooves are evenly spaced and arranged on the inner circumference of the radial plane where the sealing base is located, and the plurality of wire grooves can cooperate with the oil guide strips to form a plurality of oil guide grooves.

[0014] Furthermore, there are multiple oil guide strips, which correspond to the multiple wire slots one by one and are adapted to each other, and the multiple oil guide strips are respectively engaged with the openings of the wire slots along the axial direction of the stator assembly.

[0015] Furthermore, it also includes insulating paper, which is filled between the oil guide groove and the stator winding.

[0016] Furthermore, both sides of the stator winding have winding ends exposed from the stator core, and there are two sealing end covers, which are respectively connected to the sealing bases on both sides.

[0017] Furthermore, it also includes an oil inlet and an oil outlet, the oil inlet and the oil outlet are respectively connected to the sealing end covers on both sides, and the oil inlet and the oil outlet are both connected to the cooling cavity.

[0018] Furthermore, the oil inlet and the oil outlet both extend outwardly along the axial direction of the stator assembly.

[0019] An embodiment of the utility model further discloses a motor, comprising the above-mentioned stator assembly.

[0020] The stator assembly and motor provided by the present invention have the following beneficial effects, including but not limited to:

[0021] 1) The stator assembly has interconnected oil guide grooves and cooling cavities, which enable the end of the stator winding to be immersed and the stator core to be directly cooled in the slots, thereby facilitating the direct removal of heat from the heat source, more effectively controlling the motor temperature, improving the motor efficiency, and allowing the motor to operate at a higher power density;

[0022] 2) The design of the oil guide strip and sealing end cover of the stator assembly can avoid changes to the original stator and rotor punchings, has no impact on electromagnetics, can save design and production costs, and is conducive to industrial promotion;

[0023] 3) The stator assembly adopts a sealed end cover made of insulating material, which can make the stator assembly have good electrical insulation performance, thereby improving the electrical safety of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0025] Figure 1 A schematic structural diagram of a stator assembly provided in an embodiment of the present utility model;

[0026] Figure 2 A cross-sectional view of a stator assembly provided in an embodiment of the present utility model;

[0027] Figure 3 A partial schematic diagram of a stator assembly provided in an embodiment of the present utility model;

[0028] Figure 4 Another structural schematic diagram of a stator assembly provided in an embodiment of the present utility model;

[0029] Figure 5 A partial cross-sectional view of the sealing base provided in an embodiment of the present utility model.

[0030] Icon: 100- stator assembly; 10- stator core; 101- sealing base; 11- oil guide strip; 111- oil guide groove; 112- insulating paper; 12- stator winding; 121- winding end; 13- sealing end cover; 131- cooling cavity; 141- oil inlet; 142- oil outlet. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0032] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed at will, and the component layout may also be more complex.

[0033] Figure 1 Schematic diagram of the structure of the stator assembly 100 provided in the embodiment of the present utility model. Figure 1As shown, the present invention provides a stator assembly 100, which includes a stator core 10, an oil guide strip 11, a stator winding 12, and a sealed end cover 13. The stator core 10 includes a sealed base 101 at an end. The oil guide strip 11 and the sealed base 101 cooperate to form an oil guide groove 111. The stator winding 12 is fixed in the oil guide groove 111, and at least one winding end 121 of the stator winding 12 is exposed from the stator core 10. The sealed end cover 13 is connected to the sealed base 101 and cooperates to form a cooling cavity 131 for accommodating the winding end 121. The oil guide groove 111 and the cooling cavity 131 are interconnected.

[0034] It is worth noting that the stator assembly 100 forms a cooling oil circuit through the interconnected oil guide groove 111 and the cooling cavity 131. The cooling oil circuit is circulated with coolant, so that the end of the stator winding 12 can be immersed in the slot of the stator core 10 and directly cooled, thereby facilitating the direct removal of heat from the heat source, more effectively controlling the motor temperature, improving the motor efficiency, and allowing the motor to operate at a higher power density. It can also be understood that the coolant in this embodiment is cooling oil. Depending on the specific implementation environment, other liquids or gases can also be used as cooling media. In addition, the oil guide strip 11 or oil guide groove 111 mentioned in this embodiment is only a reference to its name, and is not limited to restricting the flow of cooling oil or accommodating the passage of cooling oil. Other liquids or gases can also be used in conjunction with it.

[0035] It is also worth noting that the design of the oil guide strip 11 and the sealing end cover 13 of the stator assembly 100 can avoid changes to the original stator and rotor punchings, has no impact on electromagnetics, can save design and production costs, and is conducive to industrial promotion.

[0036] In this embodiment, the sealing end cover 13 is an insulating end cover, and the sealing end cover 13 is insulated from the sealing base 101 .

[0037] It is worth noting that the stator assembly 100 uses a sealing end cover 13 made of an insulating material, which can enable the stator assembly 100 to have good electrical insulation performance, thereby improving the electrical safety of the motor. Specifically, the insulating end cover in this embodiment can be a plastic end cover, which has the characteristics of low cost and excellent insulation performance, and can separate the cooling oil from the rotor assembly. Depending on the specific implementation environment, other insulating materials can also be used as the manufacturing material of the sealing end cover 13, such as ceramic materials, rubber materials, etc. This embodiment does not constitute a material restriction on the insulating end cover, but is only an example of its material. It can also be understood that the insulating connection here refers to connecting different components (sealing end cover 13 and sealing base 101) to each other, while ensuring that the connection part is covered or isolated by insulating material to prevent current leakage or short circuit.

[0038] Please refer to Figure 2 and Figure 3 , the sealing end cover 13 is glued to the sealing base 101; or the sealing end cover 13 is laser welded to the sealing base 101.

[0039] It is worth noting that gluing refers to a glue spot connection, which uses laser welding or glue spot connection to connect the sealing end cover 13 to the sealing base 101. It has good airtightness, so that the winding ends 121 at both ends of the stator core 10 can be completely immersed in the cooling oil in the cooling cavity 131 for sufficient cooling.

[0040] Figure 4 Another structural schematic diagram of the stator assembly 100 provided in an embodiment of the present utility model; Figure 5 This is a partial cross-sectional view of the sealing base 101 provided in an embodiment of the present invention. Figure 4 and Figure 5 As shown, the sealing base 101 includes a plurality of wire grooves with one side opening, and the plurality of wire grooves are evenly spaced and arranged on the radial plane where the sealing base 101 is located ( Figure 2 The radial direction shown is the direction of the radial plane), and the multiple grooves can cooperate with the oil guide strip 11 to form a plurality of oil guide grooves 111.

[0041] It is worth noting that the multiple evenly spaced wire slots, in conjunction with the oil guide strips 11, form multiple oil guide slots 111, effectively guiding the flow of cooling oil, preventing it from stagnating in the sealed area and reducing the risk of oil leakage or oil accumulation. Furthermore, the arrangement of the wire slots, in conjunction with the oil guide strips 11, creates a rational oil channel, enabling direct cooling within the slots of the stator core 10, improving cooling efficiency and more effectively controlling motor temperature.

[0042] Optionally, there are multiple oil guide strips 11, and the multiple oil guide strips 11 correspond to the multiple wire slots one by one and are adapted to each other, and the multiple oil guide strips 11 are respectively along the axial direction of the stator assembly 100 (such as Figure 2 The axial direction shown) is snap-fitted to the opening of the wire trough.

[0043] Specifically, the one-to-one correspondence between the oil guide strips 11 and the wire slots allows them to be accurately embedded in each wire slot, ensuring that the cooling oil can flow within the predetermined oil guide channel, preventing the cooling oil from stagnating or overflowing in unintended areas, and improving the accuracy and efficiency of oil guidance. Depending on the specific implementation environment, a single annular oil guide strip 11 can also be embedded in the inner circumference of the stator core 10, and then snapped into the openings of multiple wire slots. Compared to the above solution, multiple oil guide strips 11 also have good parts interchangeability, which helps save maintenance costs.

[0044] In this embodiment, an insulating paper 112 is further included, and the insulating paper 112 is filled between the oil guide groove 111 and the stator winding 12 .

[0045] Specifically, the insulating paper 112 is assembled and sealed with the sealing base 101 and the oil guide strip 11 to form an oil passage, which can further improve the insulation performance and effectively isolate the electrical connection between the oil guide groove 111 and the stator winding 12, preventing current from leaking through the oil guide groove 111 or other non-conductive parts, thereby improving the safety and reliability of the electrical system.

[0046] Please refer again Figure 2 Both sides of the stator winding 12 have winding ends 121 exposed from the stator core 10 , and there are two sealing end covers 13 , which are respectively connected to the sealing bases 101 on both sides.

[0047] Optionally, the stator assembly 100 further includes an oil inlet 141 and an oil outlet 142, which are respectively connected to the sealing end covers 13 on both sides, and both are in communication with the cooling cavity 131. The oil inlet 141 and the oil outlet 142 both extend outwardly in the axial direction of the stator assembly 100.

[0048] Specifically, the oil inlet 141 and the oil outlet 142 are both connected to the cooling cavity 131, which can form an effective oil circulation channel, thereby facilitating the removal of heat generated by the motor during operation. The cooling oil can enter through the oil inlet 141, pass through the cooling cavity 131 of the stator assembly 100, absorb the heat of the winding end 121, and then flow through the oil guide groove 111, absorbing the heat in the stator core 10, and then be discharged from the oil outlet 142 to ensure the normal operating temperature of the motor and avoid overheating damage. It can be understood that this embodiment is not limited to the oil inlet method of the stator core 10, and can be combined with different designs and combinations of oil inlets 141 and oil outlets 142 such as axial and radial to adapt to different motors.

[0049] This embodiment also discloses a motor, including the above-mentioned stator assembly 100, with all its beneficial effects.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

[0051] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0052] Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described herein and shown are possible in light of the teachings herein and are considered part of the spirit and scope of the invention.

[0053] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0054] In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only and not limiting. Furthermore, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or." Where a term is unclear in providing separation or combination capabilities, the combination of components or steps will also be considered as indicated.

[0055] As used in the description herein and throughout the claims that follow, “a,” “an,” and “the” include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless otherwise indicated.

[0056] The above description of the illustrated embodiments of the present invention (including the content in the Abstract) is not intended to be exhaustive or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, as those skilled in the art will recognize and understand, various equivalent modifications are possible within the spirit and scope of the present invention. As noted, these modifications can be made to the present invention in accordance with the above description of the embodiments of the present invention, and these modifications will be within the spirit and scope of the present invention.

[0057] The systems and methods have been generally described herein in detail to facilitate understanding of the present invention. In addition, various specific details have been given to provide an overall understanding of the embodiments of the present invention. However, those skilled in the relevant art will recognize that the embodiments of the present invention can be practiced without one or more of the specific details, or can be practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusing various aspects of the embodiments of the present invention.

Claims

1. A stator assembly, characterized in that: include: a stator core including a sealing base at the end; An oil guide strip cooperates with the sealing base to form an oil guide groove; a stator winding fixed in the oil guide groove, with at least one winding end of the stator winding exposed from the stator core; A sealing end cover connected to the sealing base and cooperating with each other to form a cooling cavity for accommodating the winding end; Wherein, the oil guide groove and the cooling cavity are communicated with each other.

2. The stator assembly according to claim 1, characterized in that The sealing end cover is an insulating end cover, and the sealing end cover is insulated and connected to the sealing base.

3. The stator assembly according to claim 1 or 2, characterized in that: The sealing end cover is glued to the sealing base; or the sealing end cover is laser welded to the sealing base.

4. The stator assembly according to claim 1, characterized in that The sealing base includes a plurality of wire grooves with one side opening, and the plurality of wire grooves are evenly spaced and arranged on the inner circumference of the radial plane where the sealing base is located, and the plurality of wire grooves can cooperate with the oil guide strips to form a plurality of oil guide grooves.

5. The stator assembly according to claim 4, characterized in that There are multiple oil guide strips, each of which corresponds to and fits the wire slots one by one, and each of which is clamped with the openings of the wire slots along the axial direction of the stator assembly.

6. The stator assembly according to claim 4 or 5, characterized in that: It also includes insulating paper, which is filled between the oil guide groove and the stator winding.

7. The stator assembly according to claim 1, characterized in that Both sides of the stator winding have the winding ends exposed from the stator core. There are two sealing end covers, and the two sealing end covers are respectively connected to the sealing bases on both sides.

8. The stator assembly according to claim 7, characterized in that It also includes an oil inlet and an oil outlet, which are respectively connected to the sealing end covers on both sides, and both the oil inlet and the oil outlet are communicated with the cooling cavity.

9. The stator assembly according to claim 8, characterized in that The oil inlet and the oil outlet both extend outwardly along the axial direction of the stator assembly.

10. A motor, characterized in that: The invention comprises a stator assembly according to any one of claims 1 to 9.

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