Motor, power assembly and vehicle

Abstract

The utility model discloses a motor, a power assembly and a vehicle. The motor comprises a casing and a stator core. A liquid inlet hole is formed in the machine shell. The periphery of the stator core is hermetically connected to the casing. A first annular flow channel is formed between the periphery of the stator core and the casing. The first annular flow channels are continuously arranged in the circumferential direction of the stator iron core. The first annular flow channel communicates with the liquid inlet hole. A yoke part of the stator core is provided with a first axial flow channel. The first axial flow channel extends along the axial direction of the stator core. The first axial flow channel communicates with the first annular flow channel. According to the utility model, the heat transfer effect and speed can be obviously improved without additionally arranging other parts for heat conduction, so that the heat dissipation effect of the motor is ensured.

Description

Technical Field

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

[0002] The motor in the related art includes an oil injection pipe located between the housing and the stator. An oil nozzle is provided at one end of the oil injection pipe, and a liquid inlet hose is connected to the other end of the oil injection pipe. The liquid inlet hose is connected to the right liquid inlet pipe through a liquid inlet tap. The spray direction of the oil nozzle is toward the winding at the end of the stator core. However, the internal space of the motor is small, and this method of arranging the oil injection pipeline inside the motor is difficult to implement.

[0003] Therefore, it is necessary to provide a motor and a vehicle to at least partially solve the above problems. Utility Model Content

[0004] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0005] In order to at least partially solve the above problems, the utility model provides a motor in a first aspect, the motor comprising:

[0006] a housing, wherein a liquid inlet hole is formed on the housing; and

[0007] A stator core, wherein the outer periphery of the stator core is sealed and connected to the casing, a first annular flow channel is formed between the outer periphery of the stator core and the casing, the first annular flow channel is continuously arranged along the circumferential direction of the stator core, the first annular flow channel is connected to the liquid inlet hole, a first axial flow channel is opened on the yoke of the stator core, the first axial flow channel is extended along the axial direction of the stator core, and the first axial flow channel is connected to the first annular flow channel.

[0008] According to the motor of the first aspect of the utility model, a first annular flow channel is formed between the outer periphery of the stator core and the housing, and the first annular flow channel is continuously arranged along the circumference of the stator core, and a liquid inlet hole connected to the first annular flow channel is arranged in the housing, so that the stator core and the stator winding can be effectively cooled when the refrigerant fluid is introduced into the first annular flow channel through the liquid inlet hole, thereby improving the efficiency and power density of the motor. Moreover, the utility model can significantly improve the effect and speed of heat transfer without the need for other components to conduct heat, thereby ensuring the heat dissipation effect of the motor.

[0009] Optionally, the motor further comprises:

[0010] Two retaining rings are arranged opposite to each other on both sides of the stator core along the axial direction, the retaining rings are sealed and connected to the stator core along the axial direction, a second annular flow channel is formed between the retaining rings and the stator core, the second annular flow channel is continuously arranged along the circumferential direction of the stator core, and the second annular flow channel is connected to the first annular flow channel and the first axial flow channel.

[0011] Optionally, a portion of the first annular flow channel is biased toward one of the two retaining rings along the axial direction, and another portion of the first annular flow channel is biased toward the other of the two retaining rings along the axial direction.

[0012] Optionally, the outer circumferential surface of the stator core is recessed radially along the stator core to form a first annular groove, the first annular groove is continuously arranged along the circumferential direction, and the inner surface of the casing closes the notch of the first annular groove to form the first annular flow channel.

[0013] Optionally, the first annular groove includes n groups of first grooves arranged in sequence along the axial direction, where n is a positive integer and n is greater than or equal to 2.

[0014] In a plane perpendicular to the axial direction, projections of two groups of the first grooves adjacent to each other along the axial direction partially overlap.

[0015] Optionally, the first annular groove includes three first grooves arranged sequentially along the axial direction.

[0016] Optionally, the stator core comprises a plurality of core sheets stacked along the axial direction, and a yoke of the core sheet is provided with a notch corresponding to the first annular groove and a liquid passage hole corresponding to the first axial flow channel.

[0017] Optionally, the retaining ring includes a radial liquid outlet hole, the radial liquid outlet hole penetrates the retaining ring along the radial direction to the inner circumferential surface of the retaining ring, and the radial liquid outlet hole is connected to the second annular flow channel.

[0018] Optionally, the retaining ring further includes an axial liquid through hole, which extends along the axial direction and is connected to the second annular flow channel and the radial liquid outlet hole.

[0019] Optionally, a second annular groove is formed at the end of the retaining ring along the axial direction facing the stator core, and the end surface of the stator core along the axial direction closes the second annular groove to form the second annular flow channel.

[0020] Optionally, the retaining ring includes a protrusion extending in the axial direction, the protrusion is connected to the first groove located at the end of the stator core, the central angle corresponding to the protrusion is equal to the central angle corresponding to the first groove, and the size of the protrusion along the axial direction is smaller than the size of the first groove located at the end along the axial direction,

[0021] A second axial flow channel is formed between the inner periphery of the protrusion and the outer periphery of the stator core, and the second axial flow channel is connected to the radial liquid outlet hole.

[0022] Optionally, the inner circumferential surface of the protrusion is provided with a liquid-passing gap, the liquid-passing gap penetrates to the end surface of the protrusion along the axial direction, and the outer circumferential surface of the stator core closes the liquid-passing gap to form the second axial flow channel.

[0023] Optionally, a liquid return hole is formed at the bottom of the housing, and the liquid return hole is connected to the second annular flow channel.

[0024] A second aspect of the utility model provides a power assembly, which includes the above-mentioned motor.

[0025] According to the power assembly of the second aspect of the utility model, by applying the above-mentioned motor, the heat dissipation efficiency and heat dissipation effect of the power assembly can be effectively improved, thereby improving the power performance of the power assembly.

[0026] A third aspect of the utility model provides a vehicle, the vehicle comprising the above-mentioned motor.

[0027] According to the vehicle of the third aspect of the utility model, by applying the above-mentioned motor, the heat dissipation efficiency and heat dissipation effect of the motor can be effectively improved, thereby improving the power performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0029] Figure 1 A cross-sectional view of a motor without an end cover installed according to a preferred embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of an iron core sheet according to a preferred embodiment of the utility model;

[0031] Figure 3 for Figure 1 A schematic diagram of the structure of the retaining ring;

[0032] Figure 4 for Figure 1A schematic diagram of the structure of the stator core in FIG. 1 ; and

[0033] Figure 5 for Figure 1 Schematic diagram of the structure in which the stator core and retaining ring are assembled together.

[0034] Description of reference numerals:

[0035] 100: Motor 100a: First annular flow channel

[0036] 100b: second annular flow channel 100c: second axial flow channel

[0037] 110: housing 111: liquid inlet channel

[0038] 112: Liquid inlet hole 113: Liquid return channel

[0039] 114: Liquid return hole 120: Stator core

[0040] 121: yoke 121a: first annular groove

[0041] 121b: first groove 121c: first axial flow channel

[0042] 122: Iron core 122a: Notch

[0043] 122b: Liquid hole 130: Retaining ring

[0044] 131: radial outlet hole 132: axial liquid hole

[0045] 133: Second annular groove 135: Protrusion

[0046] 135a: Fluid passage gap DETAILED DESCRIPTION

[0047] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0048] In order to fully understand the implementation of the present invention, a detailed structure will be presented in the following description. Obviously, the implementation of the implementation of the present invention is not limited to the specific details familiar to those skilled in the art.

[0049] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention, and the singular forms "a", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or combinations thereof.

[0050] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

[0051] The "parallel" / "vertical" and similar expressions used in the present invention include an absolute parallel / vertical relationship and a roughly parallel / vertical relationship (for example, a relationship that differs from absolute parallel / vertical by -5° to +5°), which can have the same effect.

[0052] The utility model provides a motor and a vehicle. The vehicle comprises the motor.

[0053] Below, we will refer to the attached Figures 1 to 5 The motor, the powertrain and the vehicle according to the specific embodiments of the present invention are described in more detail. The accompanying drawings show representative embodiments of the present invention and are not intended to limit the present invention.

[0054] like Figures 1 to 5 As shown, the motor according to the utility model may include a casing 110 and a stator core 120. A liquid inlet hole 112 is formed at the top of the casing 110. The outer periphery of the stator core 120 is sealed and connected to the casing 110. A first annular flow channel 100a is formed between the outer periphery of the yoke 121 of the stator core 120 and the casing 110. The first annular flow channel 100a is continuously arranged along the circumferential direction of the stator core 120. The first annular flow channel 100a is connected to the liquid inlet hole 112. The yoke 121 of the stator core 120 is also provided with a first axial flow channel 121c. The first axial flow channel 121c is extended along the axial direction of the stator core 120. One end of the first axial flow channel 121c is connected to the first annular flow channel 100a.

[0055] The motor 100 of the utility model forms a first annular flow channel 100a between the outer periphery of the stator core 120 and the housing 110, and the first annular flow channel 100a is continuously arranged along the circumference of the stator core 120, and a liquid inlet hole 112 connected to the first annular flow channel 100a is arranged in the housing 110, so that the stator core 120 and the stator winding (not shown) can be effectively cooled when the liquid inlet hole 112 passes the refrigerant fluid into the first annular flow channel 100a, thereby improving the efficiency and power density of the motor. Moreover, the utility model can significantly improve the effect and speed of heat transfer without the need for other components to conduct heat, thereby ensuring the heat dissipation effect of the motor.

[0056] See also Figure 1 Optionally, the outer periphery of the stator core 120 is connected to the housing 110 by interference fit. This can ensure the coaxiality of the stator core 120 and the housing 110, improve the rigidity of the stator, and improve the NVH performance.

[0057] See also Figure 1 , Figure 3 as well as Figure 5 For example, a liquid return hole 114 is formed at the bottom of the housing 110. The motor 100 may further include two retaining rings 130. The two retaining rings 130 are arranged axially opposite to each other on both sides of the stator core 120. The retaining rings 130 are sealed and connected to the stator core 120 in the axial direction. A second annular flow channel 100b is formed between the retaining ring 130 and the stator core 120. The second annular flow channel 100b is continuously arranged along the circumferential direction of the stator core 120. The second annular flow channel 100b is connected to the first annular flow channel 100a and the liquid return hole 114. When the oil flows axially from the first annular flow channel 100a to the axial end of the stator core 120, it flows into the second annular flow channel 100b, and flows to the liquid return hole 114 under the guidance of the second annular flow channel 100b and the action of its own weight. When the oil is located in the first annular flow channel 100a and the first axial flow channel 121c, the outer periphery of the stator core 120 can be cooled. When the oil is located in the second annular flow channel 100b, the end of the stator core 120 can be cooled. By cooling different parts of the stator core 120 in turn through the above two heat dissipation paths, the heat dissipation efficiency and heat dissipation effect can be effectively improved. When in use, the refrigerant fluid flows into the first annular flow channel 100a of the stator core 120 through the liquid inlet 112 at the top of the casing 110. Then, a part of the refrigerant fluid flows axially toward both ends through the first axial flow channel 121c of the yoke 121 of the stator core 120; the other part of the refrigerant fluid flows in the first annular flow channel 100a in a circumferential direction, and then flows axially toward both ends through the first axial flow channel 121c of the yoke 121 of the stator core 120. That is, eventually both parts of the coolant fluid flow into the first axial flow channel 121 c of the yoke 121 of the stator core 120 to directly cool the stator core 120 .

[0058] See also Figure 1 Furthermore, a concave liquid return groove is provided at the bottom of the casing 110. The liquid return groove is connected to the liquid return hole 114 or constitutes a part of the liquid return hole 114. The liquid return hole 114 is connected to the second annular flow channel 100b. The stator core 120 is interference fit with the casing 110. The stator including the stator core 120 forms a closed loop when matched with the end covers (not shown) on both sides. The refrigerant fluid flows in from the liquid inlet hole 112 and flows out from the liquid return hole 114. This helps to prevent the risk of refrigerant fluid leakage.

[0059] See also Figure 1 , Figure 4 as well as Figure 5 , further, a part of the first annular flow channel 100a is offset toward one of the two retaining rings 130 in the axial direction and penetrates the yoke 121 of the stator core 120. Another part of the first annular flow channel 100a is offset toward the other of the two retaining rings 130 in the axial direction and penetrates the yoke 121 of the stator core 120. That is, the first annular flow channel 100a is not completely located in the middle part of the stator core 120 in the axial direction. Specifically, a part of the first annular flow channel 100a is located at the edge part of the stator core 120 in the axial direction, and another part of the first annular flow channel 100a is located in a certain middle part of the stator core 120 in the axial direction. In this way, the first annular flow channel 100a is not only extended and arranged along the circumferential direction of the stator core 120, but also extends in the axial direction of the stator core 120. In other words, when the first annular flow channel 100a is unfolded, the first annular flow channel 100a is arranged in a serpentine shape. This can slow down the flow rate of the fluid in the first annular flow channel 100a, so that the coolant fluid can more fully exchange heat with the stator core 120, thereby improving the cooling efficiency.

[0060] Continue reading Figure 1 , Figure 4 as well as Figure 5 Furthermore, the outer circumferential surface of the stator core 120 is recessed along the radial direction of the stator core 120 to form a first annular groove 121a. The first annular groove 121a is continuously arranged along the circumferential direction. The inner surface of the housing 110 closes the notch of the first annular groove 121a to form a first annular flow channel 100a. Here, an annular groove is arranged on the outer circumferential surface of the stator core 120, and the notch of the first annular groove 121a is closed by the cooperation between the stator core 120 and the housing 110, so as to form the above-mentioned first annular flow channel 100a between the outer periphery of the stator core 120 and the housing 110. The distribution and direction of the first annular groove 121a on the outer circumferential surface of the stator core 120 can be implemented with reference to the arrangement form of the above-mentioned first annular flow channel 100a.

[0061] In other examples not shown, a groove structure may also be provided on the surface of the housing 110 radially facing the stator core 120. When the housing 110 and the stator core 120 are sealed and connected, the notch of the groove structure may be closed by the outer circumferential surface of the stator core 120 to form the first annular flow channel 100a.

[0062] It is understood that in other examples not shown, groove structures may also be provided on the outer circumferential surface of the stator core 120 and the inner surface of the housing 110. By arranging the groove structure of the stator core 120 and the groove structure of the housing 110 opposite to each other and extending along the circumferential direction of the stator core 120, the first annular flow channel 100a is formed in the stator core 120 and the housing 110.

[0063] See also Figure 1 , Figure 4 and Figure 5 For example, the first annular groove 121a may include n groups of first grooves 121b arranged in sequence along the axial direction. n is a positive integer and n is greater than or equal to 2. In a plane perpendicular to the axial direction, the projections of two axially adjacent groups of first grooves 121b, for example, the orthographic projections partially overlap. Moreover, when one group of first grooves 121b is located between the other two groups of first grooves 121b in the axial direction, in a plane perpendicular to the axial direction, the overlapping portion of the projection of the group of first grooves 121b and one of the other two groups of first grooves 121b is recorded as a, and the overlapping portion of the projection of the group of first grooves 121b and the other of the other two groups of first grooves 121b is recorded as b, then a and b are arranged at intervals in the circumferential direction. In this way, the parts of the first annular flow channel 100a corresponding to the two adjacent groups of first grooves 121b can be connected, so that the first annular flow channel 100a can be continuous in the circumferential direction of the stator core 120, thereby ensuring that the first annular flow channel 100a can better cool the stator core 120 in the circumferential direction when the refrigerant fluid is passed through it.

[0064] exist Figure 4 and Figure 5 In the example shown, n is equal to 3. The first annular groove 121a may include three first grooves 121b arranged sequentially along the axial direction.

[0065] See also Figure 1 , Figure 2 , Figure 4 as well as Figure 5For example, the stator core 120 may include a plurality of core sheets 122 stacked in the axial direction. The yoke 121 of the core sheet 122 is provided with a notch 122a corresponding to the first annular groove 121a and a liquid passage hole 122b corresponding to the first axial flow channel 121c. The stacking here can be understood as that a plurality of core sheets 122 are stacked in the axial direction, and adjacent core sheets 122 can be connected together by crimping, welding, etc. After the core sheets 122 are stacked, the core sheets 122 with the notches 122a facing the same direction are set as a group, and the notches 122a of the same group of core sheets 122 form the same group of first grooves 121b.

[0066] Optionally, the first annular groove 121a includes n groups of first grooves 121b arranged in sequence along the axial direction. The central angle α corresponding to the notch 122a on the core sheet 122 is greater than 2π / n. n is a positive integer and n is greater than or equal to 2. Figure 2 As shown, n is equal to 3, then α is greater than 2π / 3, that is, α is greater than 120°.

[0067] The core sheet 122 here may be a sheet-like structure made by stamping an iron sheet.

[0068] See also Figure 1 , Figure 3 as well as Figure 5 For example, the retaining ring 130 may include a radial liquid outlet hole 131. The radial liquid outlet hole 131 penetrates the inner circumference of the retaining ring 130 along the radial direction of the retaining ring 130. The radial liquid outlet hole 131 is connected to the second annular flow channel 100b. By providing the radial liquid through hole, the oil in the second annular flow channel 100b can be sprayed to the end surface of the stator core 120 facing outward in the axial direction, so as to cool the end surface of the stator core 120.

[0069] exist Figure 3 and Figure 5 In the example shown, a plurality of radial liquid outlet holes 131 are evenly opened along the circumferential direction on the inner wall of the retaining ring 130. The refrigerant fluid is finally sprayed to the end of the stator winding through the radial liquid outlet holes 131. The radial liquid outlet holes 131 are connected through the second annular flow channel 100b, which ensures that the flow of each radial liquid outlet hole 131 is balanced, so that the cooling of the stator winding at both ends is more uniform.

[0070] See also Figure 1 and Figure 5 Optionally, the retaining ring 130 is placed at the axial end of the stator core 120. It is fixed to the housing 110 by a positioning pin. A liquid return groove is set on the contact surface between the retaining ring 130 and the stator core 120. The position of the liquid return groove is aligned with the first axial flow channel 121c. The refrigerant fluid directly enters the liquid return groove of the retaining ring 130 through the first axial flow channel 121c.

[0071] See also Figure 1 , Figure 3 as well as Figure 5 In addition, the retaining ring 130 may further include an axial liquid through hole 132. The axial liquid through hole 132 extends axially and is connected to the second annular flow channel 100b and the radial liquid outlet hole 131. By providing the axial liquid through hole 132 to connect the second annular flow channel 100b to the radial liquid outlet hole 131, it is helpful to improve the processing flexibility and manufacturing accuracy of the radial liquid outlet hole 131.

[0072] Continue reading Figure 1 , Figure 3 as well as Figure 5 For example, a second annular groove 133 is provided at the end of the retaining ring 130 facing the stator core 120 in the axial direction. The second annular groove 133 is closed at the end face of the stator core 120 in the axial direction to form a second annular flow channel 100b. This can reduce the difficulty of processing the stator core 120, and it is more convenient to process the second annular groove 133 on the retaining ring 130. Moreover, this makes the second annular flow channel 100b axially located outside the stator core 120, which is conducive to increasing the axial spacing between the radial liquid outlet hole 131 and the end face of the stator core 120, thereby increasing the oil injection range of the radial liquid outlet hole 131 on the end face of the stator core 120, and improving the cooling effect on the end of the stator core 120.

[0073] See also Figure 1 , Figures 3 to 5 Further, the retaining ring 130 may include a protrusion 135 extending in the axial direction. The protrusion 135 is connected to the first groove 121b located at the axial end of the stator core 120. The central angle corresponding to the protrusion 135 is equal to the central angle corresponding to the first groove 121b. And the axial dimension of the protrusion 135 is smaller than the axial dimension of the first groove 121b located at the end. A second axial flow channel 100c is formed between the inner periphery of the protrusion 135 and the outer periphery of the stator core 120. The second axial flow channel 100c is connected to the radial liquid outlet 131. The positioning and installation of the retaining ring 130 and the stator core 120 are facilitated by the cooperation between the protrusion 135 and the first groove 121b at the end of the stator core 120. By forming a second axial flow channel 100c between the inner periphery of the protrusion 135 and the outer periphery of the stator core 120, the first annular flow channel 100a and the second annular flow channel 100b can be connected at the position corresponding to the protrusion 135, thereby increasing the range of axial flow of the fluid on the outer peripheral surface of the stator core 120, and further improving the cooling effect on the outer periphery of the stator core 120.

[0074] See also Figure 1 , Figure 3 as well as Figure 5Furthermore, a liquid-passing notch 135a is provided on the inner circumference of the protrusion 135. The liquid-passing notch 135a extends axially through the end face of the protrusion 135. The outer circumference of the stator core 120 closes the liquid-passing notch 135a to form a second axial flow channel 100c. Here, a notch 122a is provided on the inner circumference of the protrusion 135, and the notch 122a cooperates with the outer circumference of the stator core 120, thereby forming the aforementioned second axial flow channel 100c. In this way, only the liquid-passing notch 135a needs to be processed on the retaining ring 130, which has higher flexibility and is convenient for controlling manufacturing accuracy. There is no need to perform processing on the outer circumference of the stator core 120, thereby reducing the processing cost of the stator core 120.

[0075] In the motor 100 of the utility model, the stator core 120 and the housing 110 are interference fit. The refrigerant fluid enters the liquid inlet channel 111 inside the housing 110 under the action of the oil pump, and then enters the first annular channel 100a between the stator core 120 and the housing 110 through the liquid inlet hole 112 in the housing 110. At this time, a part of the refrigerant fluid flows to the axial ends through the first axial channel 121c of the yoke 121 of the stator core 120, and the other part of the refrigerant fluid flows in the first annular channel 100a along the circumferential direction, and then flows to the axial ends through the first axial channel 121c of the yoke 121 of the stator core 120. Finally, the refrigerant fluid flows into the first axial channel 121c of the yoke 121 of the stator core 120, directly cooling the core and taking away the heat. In addition, retaining rings 130 are provided at both axial ends of the stator core 120. The contact surface between the retaining ring 130 and the first axial flow channel 121c is provided with a liquid return groove and a plurality of radial liquid outlet holes 131 are evenly opened on the inner wall. The refrigerant fluid flows through the first axial flow channel 121c of the yoke 121 and then enters the second annular groove 133 of the retaining ring 130. The plurality of radial liquid outlet holes 131 on the retaining rings 130 at both ends spray the refrigerant fluid to the end of the stator winding. Each radial liquid outlet hole 131 is connected through the second annular groove 133 of the retaining ring 130 to ensure that the flow of each radial liquid outlet hole 131 is balanced, so that the cooling of the stator winding at both ends is more uniform. The refrigerant fluid sprayed to the end of the stator winding flows into the liquid return channel 113 at the bottom of the casing 110 through the liquid return hole 114 under the action of gravity, and finally the refrigerant fluid flows out of the casing through the liquid return channel 113.

[0076] According to the motor 100 of the utility model, when in use, the refrigerant fluid enters the first annular flow channel 100a in the middle of the yoke 121 of the stator core 120 through the liquid inlet channel 111 inside the housing 110 through the liquid inlet hole 112, and then flows bidirectionally along the axial direction of the stator core 120 through the first axial flow channel 121c of the stator yoke 121 to take away heat, and finally sprays the refrigerant fluid to the stator winding located at the end of the stator core 120 through the retaining rings 130 at both axial ends of the stator core 120. Compared with the related art, the cooling effect is better. Retaining rings 130 are provided at both ends of the stator core 120, and the refrigerant fluid enters the second annular groove 133 of the retaining ring 130 through the first axial flow channel 121c of the yoke 121 of the stator core 120, which can effectively prevent the refrigerant fluid from splashing into the gap between the stator and the rotor of the motor, thereby avoiding the increase of the friction loss of the motor. At the same time, a plurality of radial liquid outlet holes 131 are evenly formed on the inner wall of the retaining ring 130, and each radial liquid outlet hole 131 is connected to the second annular groove 133 of the retaining ring 130. The refrigerant fluid is evenly sprayed to the end of the stator winding through the radial liquid outlet holes 131, so that the cooling of the end of the stator winding is more even.

[0077] The motor 100 according to the utility model has the following beneficial technical effects:

[0078] (1) The utility model forms a refrigerant flow channel by slotting the inner side of the housing 110, so that the refrigerant enters the first annular groove 121a on the outer peripheral surface of the stator core 120 through the liquid inlet hole 112, and then the refrigerant enters the first axial oil channel, thereby achieving two-way cooling. Compared with the technical means of using spray oil channels in the related art, the utility model reduces the spray pipe, simplifies assembly, and the refrigerant can directly take away the heat of the stator core 120 and the stator winding without the need for other components to conduct heat, thereby significantly improving the effect and speed of heat transfer and ensuring the heat dissipation effect of the motor.

[0079] (2) The utility model can improve the rigidity of the stator by performing interference fit between the stator core 120 and the housing 110, and can also ensure the coaxiality between the stator core 120 and the housing 110, thereby optimizing the NVH performance.

[0080] (3) The flow channel formed by the liquid inlet channel 111, the liquid inlet hole 112, the first annular flow channel 100a, the first axial flow channel 121c, the second axial flow channel 100c, the second annular flow channel 100b, the radial liquid outlet hole 131, the liquid return hole 114, the liquid return channel 113, etc. of the utility model forms a sealed flow channel after the motor 100 is assembled. Compared with the related art, the overall weight is lighter and the material consumption is less. In addition, the utility model can effectively prevent the refrigerant fluid from splashing into the air gap between the stator and the rotor, thereby preventing the increase of the friction loss of the motor. At the same time, because the thermal conductivity of the refrigerant fluid is much greater than the thermal conductivity of air, it can also avoid the problem of heat from the stator being transferred to the rotor and causing demagnetization of the magnetic steel.

[0081] (4) The utility model uses multiple radial liquid outlet holes 131 of the retaining ring 130 at both ends of the stator core 120 to spray the coolant fluid to the ends of the stator winding. The radial liquid outlet holes 131 are connected through the second annular flow channel 100b, so that the flow of each radial liquid outlet hole 131 can be more balanced, thereby making the cooling of the stator winding at both ends of the stator core 120 more uniform.

[0082] The present invention further provides a power assembly (not shown). The power assembly may include the motor 100 described above.

[0083] According to the power assembly of the present invention, by applying the above-mentioned motor 100, the heat dissipation efficiency and heat dissipation effect of the power assembly can be effectively improved, thereby improving the power performance of the power assembly.

[0084] The utility model also provides a vehicle, which may include the motor 100 or the power assembly.

[0085] According to the vehicle of the present invention, by applying the above-mentioned motor 100 or power assembly, the heat dissipation efficiency and heat dissipation effect of the motor can be effectively improved, thereby improving the power performance of the vehicle.

[0086] The above text describes the implementation examples, main features and main advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, which are only used to illustrate the principles of the utility model, and are not intended to limit the scope of the utility model in any way. Without departing from the scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required.

[0087] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article may indicate that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0088] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of the protection claimed by the utility model.

Claims

1. A motor, characterized in that: The motor comprises: a housing, wherein a liquid inlet hole is formed on the housing; and A stator core, wherein the outer periphery of the stator core is sealed and connected to the casing, a first annular flow channel is formed between the outer periphery of the stator core and the casing, the first annular flow channel is continuously arranged along the circumferential direction of the stator core, the first annular flow channel is connected to the liquid inlet hole, a first axial flow channel is opened on the yoke of the stator core, the first axial flow channel is extended along the axial direction of the stator core, and the first axial flow channel is connected to the first annular flow channel.

2. The motor according to claim 1, characterized in that The motor also includes: Two retaining rings are arranged opposite to each other on both sides of the stator core along the axial direction, the retaining rings are sealed and connected to the stator core along the axial direction, a second annular flow channel is formed between the retaining rings and the stator core, the second annular flow channel is continuously arranged along the circumferential direction of the stator core, and the second annular flow channel is connected to the first annular flow channel and the first axial flow channel.

3. The motor according to claim 2, characterized in that A portion of the first annular flow channel is biased toward one of the two retaining rings along the axial direction, and another portion of the first annular flow channel is biased toward the other of the two retaining rings along the axial direction.

4. The motor according to claim 2, characterized in that The outer circumferential surface of the stator core is recessed along the radial direction of the stator core to form a first annular groove, the first annular groove is continuously arranged along the circumferential direction, and the inner surface of the housing closes the notch of the first annular groove to form the first annular flow channel.

5. The motor according to claim 4, characterized in that The first annular groove includes n groups of first grooves arranged in sequence along the axial direction, where n is a positive integer and n is greater than or equal to 2. In a plane perpendicular to the axial direction, projections of two groups of the first grooves adjacent to each other along the axial direction partially overlap.

6. The motor according to claim 5, characterized in that The first annular groove includes three first grooves arranged sequentially along the axial direction.

7. The electric machine according to any one of claims 4 to 6, characterized in that The stator core comprises a plurality of core sheets stacked along the axial direction, and a yoke of the core sheet is provided with a notch corresponding to the first annular groove and a liquid passage hole corresponding to the first axial flow channel.

8. The motor according to claim 5, characterized in that The retaining ring comprises a radial liquid outlet hole, the radial liquid outlet hole penetrates the retaining ring along the radial direction to the inner circumferential surface of the retaining ring, and the radial liquid outlet hole is connected to the second annular flow channel.

9. The motor according to claim 8, characterized in that The retaining ring further comprises an axial liquid through hole, which extends along the axial direction and is connected to the second annular flow channel and the radial liquid outlet hole.

10. The motor according to claim 5, characterized in that A second annular groove is formed at the end of the retaining ring along the axial direction facing the stator core, and the end surface of the stator core along the axial direction closes the second annular groove to form the second annular flow channel.

11. The motor according to claim 10, characterized in that The retaining ring includes a protrusion extending in the axial direction, the protrusion is connected to the first groove located at the end of the stator core, the central angle corresponding to the protrusion is equal to the central angle corresponding to the first groove, and the size of the protrusion along the axial direction is smaller than the size of the first groove located at the end along the axial direction, A second axial flow channel is formed between the inner periphery of the protrusion and the outer periphery of the stator core, and the second axial flow channel is connected to the radial liquid outlet hole.

12. The motor according to claim 11, characterized in that The inner circumferential surface of the protrusion is provided with a liquid-passing notch, and the liquid-passing notch penetrates to the end surface of the protrusion along the axial direction. The outer circumferential surface of the stator core closes the liquid-passing notch to form the second axial flow channel.

13. The motor according to claim 2, characterized in that A liquid return hole is formed at the bottom of the housing, and the liquid return hole is connected to the second annular flow channel.

14. A powertrain, characterized in that: The powertrain comprises the electric machine according to any one of claims 1 to 13.

15. A vehicle, characterized in that: The vehicle comprises the electric machine according to any one of claims 1 to 13 or the powertrain according to claim 14 .

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