Cooling structure of motor

Abstract

The invention relates to a cooling structure of a motor. The structure comprises a casing which is sleeved on the outer peripheral wall of a stator core, the casing is provided with a liquid inlet hole, and cooling liquid flows to the stator core through the liquid inlet hole; the stator iron core comprises a first iron core and a second iron core; iron core grooves uniformly penetrate through the end wall of the stator iron core along the circumferential direction of the stator iron core; the intermediate plate is pressed between the first iron core and the second iron core, a target cooling liquid channel is formed between the intermediate plate and the stator iron core, and cooling liquid flows into the insulation paper in the iron core groove through the target cooling liquid channel; the insulation paper is arranged in the iron core groove and comprises an insulation paper liquid hole and an insulation paper liquid path; wherein the cooling liquid flows into the insulation paper liquid path through the insulation paper liquid hole and then cools the winding of the motor. By adopting the structure, the cooling liquid can enter the insulation paper liquid path through the target cooling liquid channel and the insulation paper liquid hole, and then the cooling liquid is sprayed to the inner sides of the two ends of the motor winding through the insulation paper liquid path, so that the internal cooling efficiency of the motor can be improved.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a cooling structure of a motor. Background Art

[0002] As new energy vehicles continue to increase their requirements for motor power and economy, the power density of motors is facing new challenges. Among them, the temperature rise limit inside the motor is the main factor limiting the increase in power density, so motor cooling technology has emerged. At present, there are two main types of motor cooling technology: water cooling and oil cooling. Compared with water cooling, oil cooling provides higher heat dissipation potential because it can directly contact the heat source. Inside the motor, the stator is the main heat source.

[0003] The existing oil cooling technology focuses on cooling the outer diameter slots of the stator core, which results in low cooling efficiency inside the motor. Summary of the invention

[0004] Based on this, it is necessary to provide a cooling structure for a motor that can improve the internal cooling efficiency of the motor in order to solve the above technical problems.

[0005] In a first aspect, the present application provides a cooling structure of a motor, the structure comprising:

[0006] The casing is sleeved on the outer peripheral wall of the stator core, and a liquid inlet hole is provided on the casing, through which the coolant flows to the stator core;

[0007] The stator core comprises a first core and a second core, and the end wall of the stator core is uniformly penetrated by core slots along its circumference;

[0008] An intermediate plate is pressed between the first iron core and the second iron core, and a target coolant channel is formed between the intermediate plate and the stator iron core, through which the coolant flows into the insulating paper in the iron core slot;

[0009] The insulating paper is arranged in the core slot, and the insulating paper comprises an insulating paper liquid hole and an insulating paper liquid path; wherein the cooling liquid flows into the insulating paper liquid path through the insulating paper liquid hole to cool the winding of the motor.

[0010] In one of the embodiments, a protrusion and a first liquid hole of the intermediate plate are provided on the outer peripheral wall of the intermediate plate, the protrusion is in contact with the first iron core and the second iron core, the height of the protrusion is greater than the height of the first liquid hole of the intermediate plate, and the first liquid hole of the intermediate plate is the entrance of the target coolant channel.

[0011] In one of the embodiments, the intermediate plate end wall is uniformly penetrated by intermediate plate grooves along its circumference, and the intermediate plate grooves correspond to and are connected with the core grooves one by one; a target channel is recessed between two adjacent intermediate plate grooves, and the target channel is connected with the first liquid hole of the intermediate plate; the side wall of the intermediate plate groove is provided with an intermediate plate second liquid hole, and the target channel, the first liquid hole of the intermediate plate and the second liquid hole of the intermediate plate form a target coolant channel.

[0012] In one embodiment, a core liquid path channel is axially arranged on the outer peripheral wall of the stator core, and the first liquid hole of the middle plate corresponds to and is connected with the core liquid path channel; after the coolant flows into the core liquid path channel through the liquid inlet hole, multiple liquid paths are formed.

[0013] In one embodiment, the structure further comprises:

[0014] The first oil ring is sleeved on the first end of the winding, and the first oil ring includes a first oil ring liquid hole; wherein, after the coolant flows into the iron core liquid path channel through the liquid inlet hole, the coolant flows into the first oil ring along the axial direction of the stator iron core to form a first oil ring liquid path; the first oil ring liquid path cools the first end of the winding through the first oil ring liquid hole.

[0015] In one embodiment, the structure further comprises:

[0016] The second oil ring is sleeved on the second end of the winding, and the second oil ring includes a second oil ring liquid hole; wherein, after the coolant flows into the iron core liquid path channel through the liquid inlet hole, the coolant flows into the second oil ring along the axial direction of the stator iron core to form a second oil ring liquid path; the second oil ring liquid path cools the second end of the winding through the second oil ring liquid hole.

[0017] In one embodiment, the plurality of fluid paths include an insulating paper fluid path, a first oil ring fluid path, and a second oil ring fluid path;

[0018] The insulating paper liquid circuit is used to cool the winding, the first end and the second end of the winding away from the casing;

[0019] The first oil ring liquid circuit is used to cool a side of the first end of the winding close to the casing;

[0020] The second oil ring liquid circuit is used to cool the side of the second end of the winding close to the casing.

[0021] In one embodiment, end plates are sleeved on the outer peripheral walls at both ends of the housing, and the side walls of the end plates and the outer peripheral wall of the housing are surrounded to form a first liquid inlet channel, wherein a first liquid inlet hole leading to the first liquid inlet channel is penetrated through the side wall of one of the end plates;

[0022] A second liquid inlet hole is formed through the outer peripheral wall of the housing to form a second liquid inlet channel;

[0023] The cooling liquid flows to the iron core liquid path channel of the stator iron core through the first liquid inlet channel and the second liquid inlet channel.

[0024] In one of the embodiments, the insulating paper further includes an insulating paper groove, which is arranged in the core groove; the insulating paper liquid path is arranged on a side away from the core groove, and the insulating paper liquid hole is located on one side of the insulating paper liquid path.

[0025] In one of the embodiments, the insulating paper further includes an insulating paper redundant oil path, through which paint is dripped onto the insulating paper.

[0026] The cooling structure of the above-mentioned motor includes a housing, a stator core, an intermediate plate and insulating paper. The housing is sleeved on the outer peripheral wall of the stator core, and a liquid inlet hole is provided on the housing, through which the coolant flows to the stator core; the stator core includes a first core and a second core, and the stator core end wall is evenly penetrated with core slots along its own circumference; the intermediate plate is pressed between the first core and the second core, and a target coolant channel is formed between the intermediate plate and the stator core, and the coolant flows into the insulating paper in the core slot through the target coolant channel; the insulating paper is arranged in the core slot, and the insulating paper includes an insulating paper liquid hole and an insulating paper liquid path; wherein, after the coolant flows into the insulating paper liquid path through the insulating paper liquid hole, the winding of the motor is cooled. With this structure, the coolant can flow into the insulating paper in the core slot through the liquid inlet hole, and the coolant can enter the insulating paper liquid path through the insulating paper liquid hole, and then the coolant can be sprayed to the inner side of the two ends of the motor winding through the insulating paper liquid path, which can improve the internal cooling efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] FIG1 is a schematic diagram of a cooling structure of a motor in one embodiment;

[0029] FIG2 is a schematic diagram of the structure of a single core punching sheet in one embodiment;

[0030] FIG3 is a schematic diagram of the structure of a first core or a second core in one embodiment;

[0031] FIG4 is a schematic diagram of the structure of an intermediate plate in one embodiment;

[0032] FIG5 is a schematic diagram of the structure of insulating paper in one embodiment;

[0033] FIG6 is an isometric view of an intermediate plate in one embodiment;

[0034] FIG7 is a side cross-sectional view of a cooling structure of a motor in one embodiment;

[0035] FIG8 is a schematic structural diagram of a first oil ring in one embodiment;

[0036] FIG9 is a schematic diagram of the structure of a second oil ring in one embodiment;

[0037] FIG10 is a schematic structural diagram of a stator core in one embodiment;

[0038] FIG. 11 is a schematic diagram of the structure of insulating paper in a process according to an embodiment.

[0039] 100, housing; 200, stator core; 300, middle plate; 400, insulation paper; 500, winding; 600, first oil ring; 700, second oil ring;

[0040] 102, end plate; 104, first liquid inlet hole; 106, second liquid inlet hole; 202, first iron core; 204, second iron core; 206, iron core slot; 208, iron core liquid path; 302, protrusion; 304, first liquid hole of middle plate; 306, middle plate slot; 308, second liquid hole of middle plate; 402, insulating paper liquid hole; 404, insulating paper liquid path; 406, insulating paper slot; 408, insulating paper redundant oil path; 602, first oil ring liquid hole; 702, second oil ring liquid hole;

[0041] 11. Iron core punching sheet; 112. Punching sheet notch; 114. Punching sheet groove; 21. Target channel. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0049] In an exemplary embodiment, as shown in FIG1 , a schematic diagram of a cooling structure of a motor is shown, which includes a housing 100, a stator core 200, an intermediate plate 300 and an insulating paper 400. The housing 100 is sleeved on the outer peripheral wall of the stator core 200. The housing 100 is provided with a liquid inlet hole, and the coolant flows to the stator core 200 through the liquid inlet hole; the stator core 200 includes a first core 202 and a second core 204, and the end wall of the stator core 200 is uniformly penetrated with core slots 206 along its own circumference; The intermediate plate 300 is pressed between the first iron core 202 and the second iron core 204, and a target coolant channel is formed between the intermediate plate 300 and the stator iron core 200, and the coolant flows into the insulating paper in the iron core slot 206 through the target coolant channel; the insulating paper 400 is arranged in the iron core slot 206, and the insulating paper 400 includes an insulating paper liquid hole 402 and an insulating paper liquid path 404; wherein, after the coolant flows into the insulating paper liquid path 404 through the insulating paper liquid hole 402, the winding 500 of the motor is cooled.

[0050] The first core 202 and the second core 204 have the same structure, and are both formed by stacking a plurality of core punching sheets 11. FIG2 is a schematic diagram of the structure of a single core punching sheet 11. The outer peripheral wall of the single core punching sheet 11 is uniformly distributed with punching sheet notches 112 along its own circumference, and the end wall of the single core punching sheet 11 is uniformly penetrated with punching sheet grooves 114 along its own circumference. When stacking a plurality of core punching sheets 11, the punching sheet notches 112 and the punching sheet grooves 114 of each core punching sheet 11 are kept corresponding and connected. FIG3 is a schematic diagram of the structure of the first core 202 or the second core 204. When a plurality of core punching sheets 11 form the first core 202 and the second core 204, a plurality of punching sheet notches 112 form the core fluid path 208 of the stator core 200, and a plurality of punching sheet grooves 114 form the core grooves 206 of the stator core 200. The stator core 200 is composed of a first core 202 and a second core 204 . The core fluid passage 208 and the core slot 206 of the first core 202 correspond to and communicate with the core fluid passage 208 and the core slot 206 of the second core 204 .

[0051] FIG4 is a schematic diagram of the structure of the intermediate plate 300. The outer peripheral wall of the intermediate plate 300 is uniformly distributed with notches along its own circumference, thereby forming the first liquid hole 304 of the intermediate plate, and the end wall of the intermediate plate 300 is uniformly penetrated with the intermediate plate groove 306 along its own circumference. The intermediate plate 300 is pressed between the first iron core 202 and the second iron core 204. The intermediate plate groove 306 and the iron core groove 206 of the first iron core 202 and the second iron core 204 are kept corresponding and connected, and the first liquid hole 304 of the intermediate plate and the iron core liquid channel 208 of the first iron core 202 and the second iron core 204 are kept corresponding and connected. The material of the intermediate plate 300 is not limited here, and can be a soft magnetic composite material (SMC). The soft magnetic composite material (SMC) has a high magnetic permeability and good processing technology.

[0052] As shown in FIG5 , it is a schematic diagram of the structure of the insulating paper 400, the insulating paper 400 includes an insulating paper liquid hole 402 and an insulating paper liquid path 404, the insulating paper 400 is arranged in the core slot 206, and the insulating paper liquid path 404 is located on the insulating paper 400 on the side away from the core slot 206. The two ends of the insulating paper liquid path 404 are respectively arranged at the two ends of the motor winding 500, and the two ends of the insulating paper liquid path 404 are located on the side away from the housing 100 at both ends of the winding 500. The two ends of the insulating paper liquid path 404 remain connected, and the insulating paper liquid hole 402 is connected to the insulating paper liquid path 404. Optionally, the insulating paper liquid hole 402 can correspond to the outlet of the target coolant channel, that is, the coolant can flow into the insulating paper liquid path 404 through the target coolant channel and the insulating paper liquid hole 402, and then spray to the side of the two ends of the winding 500 away from the housing 100 through the insulating paper liquid path 404.

[0053] Exemplarily, the middle plate 300 is pressed between the first iron core 202 and the second iron core 204, the iron core liquid path channel 208 is connected to the first liquid hole 304 of the middle plate, and a target coolant channel is formed between the middle plate 300 and the stator iron core 200. When the coolant flows to the stator iron core 200 through the liquid inlet hole on the housing 100 and enters the iron core liquid path channel 208, the coolant can enter the target coolant channel through the first liquid hole 304 of the middle plate, and flow into the insulating paper 400 through the target coolant channel, and the insulating paper liquid hole 402 of the insulating paper 400 is connected to the target coolant channel. After the coolant passes through the insulating paper liquid hole 402, the coolant flows into the insulating paper liquid path 404, and the coolant is sprayed to the inner side of the two ends of the motor winding 500 through the insulating paper liquid path 404, so as to achieve cooling treatment of the motor.

[0054] In this embodiment, the housing 100 is provided with a liquid inlet hole, through which the coolant can flow to the stator core 200; the middle plate 300 is pressed between the first core 202 and the second core 204, and a target coolant channel is formed between the middle plate 300 and the stator core 200, through which the coolant can flow into the insulating paper 400, thereby enabling the insulating paper liquid path 404 to spray the coolant to the inner side of both ends of the motor winding 500, thereby cooling the motor. This structure can cool the inner side of both ends of the motor winding 500, and can improve the cooling efficiency inside the motor.

[0055] In an exemplary embodiment, as shown in FIG6 , which is an axial view of the intermediate plate 300, a protrusion 302 and a first liquid hole 304 of the intermediate plate are provided on the outer peripheral wall of the intermediate plate 300. The protrusion 302 is in contact with the first iron core 202 and the second iron core 204. The height of the protrusion 302 is greater than the height of the first liquid hole 304 of the intermediate plate. The first liquid hole 304 of the intermediate plate is the entrance of the target coolant channel.

[0056] The outer peripheral wall of the middle plate 300 is evenly provided with protrusions 302 and the first liquid hole 304 of the middle plate. The side walls of the two ends of the protrusion 302 are sealed and fitted with the first iron core 202 and the second iron core 204 respectively, which can ensure the stability and reliability between the middle plate 300 and the first iron core 202 and the second iron core 204. The first liquid hole 304 of the middle plate is located between two adjacent protrusions 302, and the height of the protrusion 302 is greater than the height of the first liquid hole 304 of the middle plate, so that the coolant can flow into the first liquid hole 304 of the middle plate.

[0057] In this embodiment, the protrusion 302 is provided so that the intermediate plate 300 can be sealed and fitted with the first core 202 and the second core 204, thereby improving the stability and reliability of the stator core 200. The height of the protrusion 302 is greater than the height of the first liquid hole 304 of the intermediate plate, so that the first liquid hole 304 of the intermediate plate can flow with coolant, and then the coolant is introduced into the intermediate plate groove 306.

[0058] In the previous exemplary embodiment, please refer to Figure 6 again. The middle plate 300 end wall is uniformly penetrated by middle plate grooves 306 along its own circumference. The middle plate grooves 306 correspond to and are connected with the core grooves 206 one by one. A target channel 21 is recessed between two adjacent middle plate grooves 306. The target channel 21 is connected with the first liquid hole 304 of the middle plate. The side wall of the middle plate groove 306 is provided with an middle plate second liquid hole 308. The target channel 21, the first liquid hole 304 of the middle plate and the second liquid hole 308 of the middle plate form a target coolant channel.

[0059] Exemplarily, the middle plate 300 has middle plate grooves 306 uniformly extending through the end wall along its circumference, the height of the middle plate grooves 306 is flush with the height of the protrusion 302, the number of the middle plate grooves 306 is equal to the number of the core grooves 206 of the first core 202 and the second core 204, and the ends of the middle plate grooves 306 are respectively sealed and fitted with the ends of the core grooves 206 of the first core 202 and the second core 204 close to the middle plate grooves 306, so that the middle plate grooves 306 and the core grooves 206 can correspond one-to-one and be connected. A channel is formed between two adjacent intermediate plate grooves 306 of the intermediate plate 300, which extends from the intermediate plate first liquid hole 304 to the intermediate plate groove 306. Specifically, a target channel 21 is recessed between the two adjacent intermediate plate grooves 306, and the target channel 21 is connected to the intermediate plate first liquid hole 304, so that the coolant can flow directly into the target channel 21 through the intermediate plate first liquid hole 304. At the same time, an intermediate plate second liquid hole 308 is provided on the side wall of the intermediate plate groove 306, and the intermediate plate second liquid hole 308 is connected to the target channel 21. When the coolant flows into the target channel 21 through the intermediate plate first liquid hole 304, the coolant enters the intermediate plate groove 306 and the core groove 206 through the intermediate plate second liquid hole 308. Optionally, a notch can be provided on the side wall of one side of the intermediate plate groove 306 to form the intermediate plate second liquid hole 308, or a hole can be drilled on the side wall of one side of the intermediate plate groove 306 to form the intermediate plate second liquid hole 308. The second liquid hole 308 of the middle plate is the outlet of the target coolant channel.

[0060] The insulating paper 400 is arranged in the core slot 206. Optionally, the insulating paper liquid hole 402 corresponds to the second liquid hole 308 of the middle plate. After the coolant flows into the insulating paper liquid hole 402 through the second liquid hole 308 of the middle plate, the coolant enters the insulating paper liquid path 404. The two ends of the insulating paper liquid path 404 cool the inner side of the end of the motor winding 500 respectively.

[0061] In this embodiment, the target channel 21 is recessed between two adjacent intermediate plate grooves 306, and the two ends of the target channel 21 are respectively connected to the first liquid hole 304 of the intermediate plate and the second liquid hole 308 of the intermediate plate, so that the coolant can pass through the first liquid hole 304 of the intermediate plate and flow into the second liquid hole 308 of the intermediate plate along the target channel 21, and then flow into the insulating paper liquid path 404, so that the distribution of the coolant is more uniform, thereby improving the cooling efficiency.

[0062] In an exemplary embodiment, FIG7 is a side sectional view of the cooling structure of the motor, please refer to FIG1 and FIG7, end plates 102 are sleeved on the outer peripheral walls at both ends of the casing 100, and the side walls of the end plates 102 and the outer peripheral walls of the casing 100 are arranged to form a first liquid inlet channel, wherein a first liquid inlet hole 104 leading to the first liquid inlet channel is penetrated on the side wall of one of the end plates 102; a second liquid inlet hole 106 is penetrated on the outer peripheral wall of the casing 100 to form a second liquid inlet channel; the coolant flows to the core liquid path channel 208 of the stator core 200 through the first liquid inlet channel and the second liquid inlet channel.

[0063] Both the first liquid inlet channel and the second liquid inlet channel can lead to the core liquid path channel 208, so that the coolant flows to the core liquid path channel 208 through the first liquid inlet channel, and then the coolant is diverted through the core liquid path channel 208 to form multiple coolant branches. Optionally, the outlets of the first liquid inlet channel and the second liquid inlet channel can be the same or different. Specifically, the outlet of the first liquid inlet channel can be set at a position close to one end of the motor winding 500, and the outlet of the second liquid inlet channel can be set at a position close to the other end of the motor winding 500, so that after the coolant flows to the core liquid path channel 208, the coolant can quickly flow to the two ends of the motor winding 500, while ensuring that the coolant can flow to the first liquid hole 304 of the middle plate.

[0064] In this embodiment, multiple liquid inlet holes and multiple liquid inlet channels are provided on the housing 100, which can enable the coolant to flow quickly to the two ends of the motor winding 500 and ensure that the coolant can flow to the first liquid hole 304 of the middle plate, thereby improving the reliability and efficiency of motor cooling.

[0065] In an exemplary embodiment, a core liquid path channel 208 is axially arranged on the outer peripheral wall of the stator core 200, and the first liquid hole 304 of the middle plate corresponds to and is connected to the core liquid path channel 208; after the coolant flows into the core liquid path channel 208 through the liquid inlet hole, multiple liquid paths are formed.

[0066] Optionally, after the coolant flows into the core liquid channel 208 through the liquid inlet hole, a first branch, a second branch and a third branch can be formed; the first branch flows to one end of the motor winding 500, the second branch flows to the other end of the branch winding 500, and the third branch can flow to the first liquid hole 304 of the middle plate, and flow to the insulating paper 400 through the first liquid hole 304 of the middle plate.

[0067] In the traditional method, the flow direction of the coolant and the cooling part of the motor are relatively simple. In this embodiment, a plurality of liquid inlet holes and a plurality of liquid inlet channels are arranged on the housing 100. After the coolant flows into the iron core liquid channel 208 through the liquid inlet holes, a plurality of coolant branches are formed, thereby improving the flexibility of the cooling structure of the motor and being able to cool multiple parts of the motor at the same time, thereby improving the cooling efficiency of the motor.

[0068] In an exemplary embodiment, the cooling structure of the motor also includes a first oil ring 600, which is sleeved on the first end of the winding 500, and the first oil ring 600 includes a first oil ring liquid hole 602; wherein, after the coolant flows into the iron core liquid path channel 208 through the liquid inlet hole, the coolant flows into the first oil ring 600 along the axial direction of the stator core 200 to form a first oil ring liquid path; the first oil ring liquid path cools the first end of the winding 500 through the first oil ring liquid hole 602.

[0069] FIG8 is a schematic diagram of the structure of the first oil ring 600. The outer peripheral wall of the first oil ring 600 is evenly penetrated with first oil ring liquid holes 602 along its own circumferential direction. After the coolant flows into the first oil ring 600 along the axial direction of the stator core, the coolant is sprayed on the first end of the winding 500 through the first oil ring liquid holes 602, that is, the first end of the winding 500 is cooled.

[0070] In the previous exemplary embodiment, the cooling structure of the motor also includes: a second oil ring 700, which is sleeved on the second end of the winding 500, and the second oil ring 700 includes a second oil ring liquid hole 702; wherein, after the coolant flows into the iron core liquid path channel 208 through the liquid inlet hole, the coolant flows into the second oil ring 700 along the axial direction of the stator core 200 to form a second oil ring liquid path; the second oil ring liquid path cools the second end of the winding 500 through the second oil ring liquid hole 702.

[0071] FIG9 is a schematic diagram of the structure of the second oil ring 700. The outer peripheral wall of the second oil ring 700 is evenly penetrated with second oil ring liquid holes 702 along its own circumferential direction. After the coolant flows into the second oil ring 700 along the axial direction of the stator core 200, the coolant is sprayed on the second end of the winding 500 through the second oil ring liquid holes 702, that is, the second end of the winding 500 is cooled.

[0072] In the previous exemplary embodiment, the multiple liquid circuits include an insulating paper liquid circuit 404, a first oil ring liquid circuit, and a second oil ring liquid circuit; the insulating paper liquid circuit 404 is used to cool the winding 500, the first end of the winding 500, and the side of the second end away from the casing 100; the first oil ring liquid circuit is used to cool the side of the first end of the winding 500 close to the casing 100; the second oil ring liquid circuit is used to cool the side of the second end of the winding 500 close to the casing 100.

[0073] When the coolant flows into the iron core liquid path channel 208 through the liquid inlet hole, multiple liquid paths are formed, and the multiple liquid paths include the insulating paper liquid path 404, the first oil ring liquid path and the second oil ring liquid path.

[0074] When the coolant flows toward the stator core 200 through the liquid inlet hole on the housing 100 and enters the core liquid path channel 208, the coolant can enter the target coolant channel through the first liquid hole 304 of the middle plate, and flow into the insulating paper 400 through the target coolant channel. The insulating paper liquid hole 402 of the insulating paper 400 is connected to the target coolant channel. After the coolant passes through the insulating paper liquid hole 402, the coolant flows into the insulating paper liquid path 404, so that one end of the insulating paper liquid path 404 can spray the coolant to the inner side of the first end of the winding 500 (the side of the first end of the winding 500 away from the housing 100), and the other end of the insulating paper liquid path 404 can spray the coolant to the inner side of the second end of the winding 500 (the side of the second end of the winding 500 away from the housing 100). Optionally, the insulating paper liquid path 404 may also be provided with a through hole leading to the insulating paper slot 406 , which is located in the core slot 206 , so that the coolant in the insulating paper liquid path 404 can flow into the insulating paper slot 406 , thereby cooling the winding 500 on the core slot 206 .

[0075] When the coolant flows toward the stator core 200 through the liquid inlet hole on the housing 100 and enters the core liquid path channel 208, the coolant flows into the first oil ring 600 along the axial direction of the stator core 200, and sprays the first end of the winding 500 through the first oil ring liquid hole 602, that is, the first oil ring liquid path is used to cool the outer side of the first end of the winding 500 (the side of the first end close to the housing 100);

[0076] When the coolant flows toward the stator core 200 through the liquid inlet hole on the housing 100 and enters the core liquid path channel 208, the coolant flows into the second oil ring 700 along the axial direction of the stator core 200, and sprays the second end of the winding 500 through the second oil ring liquid hole 702, that is, the second oil ring liquid path is used to cool the outer side of the second end of the winding 500 (the side of the second end close to the housing 100).

[0077] In this embodiment, the insulating paper liquid circuit 404, the first oil ring liquid circuit and the second oil ring liquid circuit cool the inner and outer sides of the two ends of the winding 500 respectively, and the insulating paper liquid circuit 404 can also cool the winding 500 located on the core slot 206, and can cool multiple parts of the winding 500, which can greatly improve the cooling efficiency of the motor and enhance the comprehensiveness of the motor cooling.

[0078] In an exemplary embodiment, the insulating paper 400 further includes an insulating paper groove 406 , which is disposed in the core groove 206 ; the insulating paper liquid path 404 is disposed on a side away from the core groove 206 , and the insulating paper liquid hole 402 is located on one side of the insulating paper liquid path 404 .

[0079] FIG10 is a schematic diagram of the structure of the stator core 200, and the insulating paper 400 is disposed in the core slot 206. Please refer to FIG10 and FIG5 , the insulating paper slot 406 is disposed in the core slot 206. Optionally, the insulating paper liquid path 404 is located inside the winding 500 and is disposed on a side away from the core slot 206, for cooling the inside of the winding 500.

[0080] In this embodiment, by disposing the insulating paper 400 in the core slot 206 , the insulating paper 400 can cool the inner sides of both ends of the winding 500 , thereby improving the reliability of the motor cooling.

[0081] In an exemplary embodiment, the insulating paper further includes an insulating paper redundant oil passage, through which paint is dripped onto the insulating paper.

[0082] In traditional cooling solutions, a big problem faced by motor cooling solutions is that the internal oil circuit of the motor is difficult to be compatible with the paint dripping process of the insulating paper. This embodiment proposes a redundant oil circuit for insulating paper. FIG11 is a structural schematic diagram of the insulating paper 400 in the process. The insulating paper 400 is dripped with paint through the redundant oil circuit 408 of the insulating paper, which can reduce the situation where the insulating paint blocks the insulating paper liquid circuit 404 during the paint dripping process, thereby improving the reliability of the insulating paper liquid circuit 404.

[0083] In an exemplary embodiment, during the construction of the cooling structure of the motor, the intermediate plate 300 is pressed between the first core 202 and the second core 204, and the intermediate plate 300 is welded to the first core 202 and the second core 204; after the insulating paper 400 is folded into the structure of the insulating paper 400 in the process shown in Figure 11, the insulating paper 400 is dripped with paint, and after the dripping of paint is completed, the redundant oil path 408 of the insulating paper is removed, and then the insulating paper 400 after the redundant oil path 408 of the insulating paper is removed is set in the core slot 206.

[0084] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A cooling structure for a motor, It is characterized in that The structure comprises: A casing is sleeved on the outer peripheral wall of the stator core, and the casing is provided with a liquid inlet hole, through which the coolant flows to the stator core; The stator core comprises a first core and a second core, wherein the end wall of the stator core is uniformly penetrated by core slots along its circumference; An intermediate plate is pressed between the first iron core and the second iron core, a target coolant channel is formed between the intermediate plate and the stator iron core, and the coolant flows into the insulating paper in the iron core slot through the target coolant channel; Insulating paper is arranged in the core slot, and the insulating paper includes an insulating paper liquid hole and an insulating paper liquid path; wherein, after the coolant flows into the insulating paper liquid path through the insulating paper liquid hole, the winding of the motor is cooled.

2. The structure according to claim 1, It is characterized in that A protrusion and a first liquid hole of the intermediate plate are provided on the outer peripheral wall of the intermediate plate, the protrusion is in contact with the first iron core and the second iron core, the height of the protrusion is greater than the height of the first liquid hole of the intermediate plate, and the first liquid hole of the intermediate plate is the entrance of the target coolant channel.

3. The structure according to claim 2, It is characterized in that The intermediate plate end wall is uniformly penetrated by intermediate plate grooves along its circumference, and the intermediate plate grooves correspond to and are connected with the core grooves one by one; a target channel is recessed between two adjacent intermediate plate grooves, and the target channel is connected with the first liquid hole of the intermediate plate; an intermediate plate second liquid hole is provided on the side wall of the intermediate plate groove, and the target channel, the first liquid hole of the intermediate plate and the second liquid hole of the intermediate plate form the target coolant channel.

4. The structure according to claim 2, It is characterized in that The outer peripheral wall of the stator core is axially provided with a core liquid path channel, and the first liquid hole of the intermediate plate corresponds to and is connected with the core liquid path channel; after the coolant flows into the core liquid path channel through the liquid inlet hole, a plurality of liquid paths are formed.

5. The structure according to claim 4, It is characterized in that The structure also includes: A first oil ring is sleeved on the first end of the winding, and the first oil ring includes a first oil ring liquid hole; wherein, after the coolant flows into the iron core liquid path through the liquid inlet hole, the coolant flows into the first oil ring along the axial direction of the stator core to form a first oil ring liquid path; the first oil ring liquid path cools the first end of the winding through the first oil ring liquid hole.

6. The structure according to claim 5, It is characterized in that The structure also includes: A second oil ring is sleeved on the second end of the winding, and the second oil ring includes a second oil ring liquid hole; wherein, after the coolant flows into the iron core liquid path through the liquid inlet hole, the coolant flows into the second oil ring along the axial direction of the stator core to form a second oil ring liquid path; the second oil ring liquid path cools the second end of the winding through the second oil ring liquid hole.

7. The structure according to claim 6, It is characterized in that The plurality of liquid paths include the insulating paper liquid path, the first oil ring liquid path and the second oil ring liquid path; The insulating paper liquid path is used to cool the winding, the first end and the second end of the winding away from the housing; The first oil ring liquid circuit is used to cool a side of the first end of the winding close to the casing; The second oil ring fluid circuit is used to cool the side of the second end of the winding close to the casing.

8. The structure according to claim 1, It is characterized in that End plates are sleeved on the outer peripheral walls at both ends of the housing, and the side walls of the end plates and the outer peripheral wall of the housing are surrounded to form a first liquid inlet channel, wherein a first liquid inlet hole leading to the first liquid inlet channel is penetrated through the side wall of one of the end plates; A second liquid inlet hole is formed through the outer peripheral wall of the housing to form a second liquid inlet channel; The cooling liquid flows to the iron core liquid path channel of the stator iron core through the first liquid inlet channel and the second liquid inlet channel.

9. The structure according to claim 1, It is characterized in that The insulating paper further comprises an insulating paper groove, which is arranged in the iron core groove; the insulating paper liquid path is arranged on a side away from the iron core groove, and the insulating paper liquid hole is located on one side of the insulating paper liquid path.

10. The structure according to claim 1, It is characterized in that The insulating paper also includes an insulating paper redundant oil path, through which paint is dripped onto the insulating paper.

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