Motor

Abstract

The utility model provides a motor, which comprises a shell, a stator, a rotor and a stator cooling structure, the stator cooling structure comprises two cooling covers, and the two cooling covers are coaxial with the stator and are oppositely arranged along the axial direction of the stator. The end part of one axial end of the inner cylinder of the cooling cover is connected with the axial end part of the stator iron core of the stator, the connecting position is located outside the air gap, the two axial opposite ends of the outer cylinders of the two cooling covers are connected with each other, and the connecting part is connected with the axial end of the inner cylinder and the corresponding axial end of the outer cylinder. The inner cylinders, the connecting parts and the outer cylinders of the two oppositely arranged cooling covers and the stator form a cooling chamber in a surrounding manner; and the stator winding and the stator iron core are accommodated in the cooling chamber. According to the motor provided by the utility model, the cooling liquid can be completely contacted with the surface of the stator iron core and the stator winding, so that the cooling area is maximized, the cooling efficiency is higher, the stator is fully and uniformly cooled, and the air gap flux density of the motor is not influenced by a stator cooling structure.

Description

Technical Field

[0001] This utility model belongs to the field of drive device technology, and specifically relates to an electric motor. Background Technology

[0002] An electric motor, also known as a "motor," is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. During operation, motors generate heat; excessively high temperatures can affect the performance and lifespan of internal components, thus requiring effective cooling measures to maintain the motor's normal operating temperature. A typical motor structure includes a housing, a stator within the housing, and a rotor. The stator is fitted around the rotor, forming an air gap between them. Common motor cooling methods include: using a fan to blow cool air from around the motor onto the housing and internal heat-generating components, accelerating heat dissipation; or using coolant channels with water or oil as the cooling medium, where the coolant circulates and carries away the heat generated by the motor. Cooling methods utilizing cooling media are more effective than fan-based cooling, therefore, most current technologies employ this method.

[0003] In existing technologies, motor cooling methods that use cooling medium heat exchange mainly achieve cooling by spraying cooling medium onto the stator surface inside the motor through spray pipes inside the motor. However, the spray pipe method has limitations: the spray range of the cooling medium is limited, the contact area between the cooling medium and the motor stator is small, and the motor stator can only be cooled locally, resulting in low cooling efficiency. In addition, uneven cooling area can cause local overheating of the stator core or stator windings, affecting motor performance. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the existing technology where the spray pipe spraying method has a limited spray range on the stator, resulting in a small contact area between the cooling medium and the stator. This means that the motor stator can only be cooled locally, leading to low cooling efficiency and uneven cooling area, which can cause local overheating of the stator core or stator windings and affect motor performance.

[0005] To solve the above-mentioned technical problems, the present invention discloses an electric motor, including a housing, a stator and a rotor disposed within the housing, the stator being sleeved on the outer periphery of the rotor and forming an air gap between them, the electric motor also includes a stator cooling structure, the stator cooling structure including two cooling covers, the two cooling covers being disposed opposite to each other along the axial direction of the stator, and each cooling cover being coaxially disposed with the stator.

[0006] Each cooling shroud includes an inner cylinder and an outer cylinder arranged radially from the inside to the outside, and also includes a connecting part that connects one axial end of the inner cylinder and one axial end of the outer cylinder; the other axial ends of the outer cylinders of the two cooling shrouds are connected to each other, and the other axial ends of the inner cylinders of the two cooling shrouds are respectively connected to the axial ends of the stator core of the stator and the side close to the rotor, with the connection position located outside the air gap.

[0007] The inner cylinder, connecting part and outer cylinder of the two cooling shrouds surround the stator to form a cooling chamber, and the stator winding and stator core of the stator are housed in the cooling chamber.

[0008] The two cooling covers also have spaced liquid inlets and outlets, which are connected to the cooling chambers.

[0009] The above technical solution utilizes a stator cooling structure to enclose the stator windings and stator core. When stator cooling is required, coolant is introduced into the stator cooling structure, ensuring complete contact between the coolant and the surfaces of the stator windings and stator core, thus achieving thorough and uniform cooling of the stator. The stator cooling structure includes two cooling covers, each comprising an inner cylinder and an outer cylinder spaced apart radially from the inside to the outside. Each cooling cover is coaxially aligned with the stator, such that, radially, the inner cylinder is closer to the inner surface of the stator windings on the inner side of the stator, and the outer cylinder is closer to the outer surface of the stator core on the outer side of the stator. The space created between the inner and outer cylinders accommodates a portion of the stator core and stator windings.

[0010] Each inner cylinder is connected at one end near the stator core to the axial end of the stator core and the side near the rotor. The connection point is located outside the air gap formed between the stator and the rotor, thus isolating the stator winding from the air gap. The end of each inner cylinder furthest from the stator core protrudes axially from the stator winding and is connected to the axial end of its corresponding outer cylinder via a connecting part. Since the two cooling shrouds are arranged opposite each other along the axial direction of the stator, the opposite ends of the two outer cylinders of the two cooling shrouds can be connected to each other. Furthermore, a cooling chamber is formed by the inner cylinders, connecting parts, and the outer cylinders surrounding the stator core of the two oppositely arranged cooling shrouds. The stator winding and stator core are housed within the cooling chamber. When the coolant flows into the cooling chamber and reaches a certain amount, it comes into complete contact with the surface of the stator core and the stator winding, maximizing the cooling area and increasing cooling efficiency, thus achieving sufficient and uniform cooling of the stator. Furthermore, the connection point between each inner cylinder and the stator core is located outside the air gap of the motor, ensuring that the magnetic flux density of the motor air gap is not affected by the stator cooling structure.

[0011] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein the outer wall surface of the outer cylinder of each cooling shroud is connected to the inner wall surface of the housing, the liquid inlet and liquid outlet are formed on the outer cylinder, and at least two liquid flow ports are provided on the housing, the at least two liquid flow ports being respectively corresponding to the liquid inlet and liquid outlet and communicating with each other.

[0012] By adopting the above technical solution, an inlet and an outlet are provided on the outer cylinder, and at least two liquid flow ports are provided on the shell, corresponding to and communicating with the inlet and outlet respectively. Coolant can flow from one of the liquid flow ports on the shell to the inlet and enter the cooling chamber, where it exchanges heat with the stator. Then, it flows through the outlet to the other liquid flow port, completing the cooling of the stator. The connection between the outer wall of the cooling shroud and the inner wall of the shell ensures a tight fit between them, preventing gaps and allowing the coolant to flow to the outside of the cooling shroud.

[0013] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein the liquid inlet and the liquid outlet are respectively formed on opposite sides of the outer cylinder along the radial direction of the outer cylinder, and at least two liquid outlets are correspondingly formed on opposite sides along the radial direction of the shell.

[0014] By employing the above technical solution, the inlet and outlet are formed on opposite sides of the outer cylinder along its radial direction. This allows the coolant to flow radially from one side of the outer cylinder to the other, i.e., from the stator's radial direction, ensuring full contact with the stator windings and stator core, thus improving heat exchange efficiency. When the inlet is located above the outlet, the coolant enters the cooling chamber and flows downwards to the outlet under its own gravity, completing the cooling of the stator during its descent.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein at least two liquid flow channels are formed on the housing, each liquid flow channel is arranged along the axial direction of the housing, and the at least two liquid flow channels are respectively connected to the cooling chamber through corresponding liquid flow ports, inlets or outlets.

[0016] Using the above technical solution, in at least two liquid flow channels, one liquid flow channel is connected to its corresponding liquid inlet and outlet, thereby serving as a channel for introducing coolant into the cooling chamber; the other liquid flow channel is connected to its corresponding liquid outlet and outlet, thereby serving as a channel for discharging coolant carrying heat from the cooling chamber after heat exchange, allowing it to enter the next coolant circulation process. The purpose of arranging each liquid flow channel along the axial direction of the shell is to facilitate the introduction of coolant from the axial end of the shell into the liquid flow channel.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein a liquid flow channel is connected to two liquid flow ports, the two liquid flow ports are arranged along the extension direction of the liquid flow channel and are located at both ends of the liquid flow channel, the two liquid flow ports are respectively connected to a liquid inlet, and the liquid inlets are respectively located at both ends of the stator.

[0018] Another liquid flow channel is connected to two other liquid flow ports, which are arranged along the extension direction of the liquid flow channel and are each connected to a liquid outlet.

[0019] Using the above technical solution, one of the liquid flow channels for introducing coolant is connected to two liquid flow ports. The two liquid flow ports are arranged along the extension direction of the liquid flow channel, that is, the arrangement direction of the liquid flow ports for introducing coolant is parallel to the extension direction of the liquid flow channel and is located at both ends of the liquid flow channel. The two liquid flow ports are respectively connected to an inlet corresponding to the stator end. Thus, after the coolant enters the liquid flow channel, it flows into the cooling chamber from the corresponding liquid flow port and inlet, and first contacts the stator winding at the stator end, giving priority to cooling the stator winding. As the coolant gradually fills the cooling chamber, the contact area with the stator winding and stator core gradually increases until it is in complete contact with the stator, achieving sufficient and uniform cooling.

[0020] Another flow channel for discharging coolant is connected to two flow ports, which are arranged along the extension direction of the flow channel. That is, the arrangement direction of the flow ports for discharging coolant is parallel to the extension direction of the flow channel. Since a large amount of coolant accumulates in the cooling chamber, the efficiency of coolant discharge can be improved by setting two flow ports connected to the outlet.

[0021] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor in which the liquid inlet area and the liquid outlet area are both larger than the liquid flow area of ​​the liquid outlet.

[0022] By adopting the above technical solution, since the liquid inlet and liquid outlet are respectively corresponding to and connected to the liquid flow port, the liquid inlet area is larger than the liquid flow area of ​​the liquid flow port, so the size of the liquid flow port area corresponding to the liquid inlet determines the flow rate of coolant flowing into the cooling chamber; the liquid outlet area is larger than the liquid flow area of ​​the liquid flow port corresponding to it, so the size of the liquid flow port area corresponding to the liquid outlet determines the flow rate of coolant flowing out of the cooling chamber; in addition, the above arrangement can also reduce the positioning accuracy requirements between holes during installation.

[0023] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, which further includes an end cap disposed at one end of a housing. A plurality of threaded connection portions are evenly spaced on the outer periphery of the end of the housing near the end cap. The end cap is evenly spaced along its circumference and has a plurality of through holes that match the plurality of threaded connection portions. By inserting fasteners into each of the plurality of through holes and the corresponding threaded connection portions, the housing and the end cap are threadedly connected. The other end of the housing protrudes axially from one end of the corresponding cooling cover and has a protrusion formed radially therein. The protrusion abuts against the outer surface of the connection portion of the corresponding cooling cover.

[0024] Using the above technical solution, the threaded connection between the end cover and the housing facilitates disassembly. When installing the cooling cover, the end cover needs to be removed, the housing is fitted over the cooling cover, and then the end cover is fixed to the housing with fasteners. The end cover can limit the corresponding cooling cover. The side of the end cover near the housing abuts against the outer surface of the connecting part of the corresponding cooling cover to prevent the cooling cover from axially disengaging due to the motor rotation. In addition, the motor shaft can pass through the center of the end cover, and the end cover supports the shaft. A protrusion formed at one end of the housing, protruding radially from the housing, can limit the corresponding cooling cover and abut against the outer surface of the connecting part of the cooling cover to prevent the cooling cover from axially disengaging due to the motor rotation.

[0025] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein a plurality of protrusions are formed along the circumference of the housing.

[0026] By adopting the above technical solution, the multiple protrusions formed along the circumference of the shell can play a role in limiting the connection at multiple points, resulting in a better limiting effect.

[0027] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, wherein the cooling cover is made of a high-temperature resistant material.

[0028] Using the above technical solution, since the cooling chamber composed of two cooling shrouds is the core area for heat exchange between the coolant and the stator, and the coolant absorbs a large amount of heat in it, it needs to be made of high-temperature resistant materials.

[0029] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor in which two cooling covers are symmetrically arranged along the axial direction of the stator.

[0030] By adopting the above technical solution, two cooling covers are symmetrically arranged along the axial direction of the stator, and the connection between the two cooling covers is located at the central axis of the stator axial direction. Therefore, only one size of cooling cover needs to be designed during production and manufacturing, and it can be symmetrically installed from both ends of the motor axial direction during installation.

[0031] The beneficial effects of this utility model are as follows:

[0032] This invention provides an electric motor, including a housing, a stator, a rotor, and a stator cooling structure disposed within the housing. The stator cooling structure covers the stator windings and the stator core. When stator cooling is required, coolant is introduced into the stator cooling structure, ensuring complete contact between the coolant and the surfaces of the stator windings and the stator core, achieving thorough and uniform cooling of the stator. In the radial direction of the cooling shroud, the inner cylinder is closer to the inner surface of the stator windings on the inner side of the stator, and the outer cylinder is closer to the outer surface of the stator core on the outer side of the stator. The space created by the gap between the inner and outer cylinders is used to accommodate a portion of the stator core and stator windings. The connection point between each inner cylinder and the stator core is located outside the air gap formed between the stator and the rotor, thereby isolating the stator windings from the air gap. Two cooling shrouds are positioned opposite each other along the axial direction of the stator, allowing the opposite ends of the two outer cylinders of the cooling shrouds to connect. Furthermore, a cooling chamber is formed by the inner cylinders, connecting parts, and the space between the outer cylinders and the stator core of the two opposing cooling shrouds. The stator windings and stator core are housed within this cooling chamber. When the coolant flows into the cooling chamber and reaches a certain volume, it comes into complete contact with the surface of the stator core and the stator windings, maximizing the cooling area and increasing cooling efficiency, thus achieving thorough and uniform cooling of the stator. Moreover, the connection point between each inner cylinder and the stator core is located outside the motor's air gap, ensuring that the motor's air gap magnetic flux density is not affected by the stator cooling structure. Attached Figure Description

[0033] Figure 1 An axial cross-sectional view of the motor provided for an embodiment of this utility model;

[0034] Figure 2 A schematic diagram of the structure of the cooling cover of the motor provided for an embodiment of this utility model;

[0035] Figure 3 A three-dimensional structural diagram of the motor provided for an embodiment of this utility model.

[0036] Figure 4 Another three-dimensional structural diagram of the motor provided for an embodiment of this utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Electric motor;

[0039] 10. Housing; 100. Liquid outlet; 110. Liquid flow channel; 120. Protrusion; 130. Threaded connection; 20. Stator; 200. Stator core; 210. Stator winding; 30. Rotor; 40. Air gap; 50. Stator cooling structure; 500. Cooling cover; 501. Inner cylinder; 502. Outer cylinder; 503. Connection; 504. Liquid inlet; 505. Liquid outlet; 510. Cooling chamber; 60. End cap; 600. Through hole; 70. Fastener;

[0040] X, the axial direction of the stator; Y, the radial direction of the stator. Detailed Implementation

[0041] As a crucial component that converts electrical energy into kinetic energy, electric motors play a vital role in various fields, especially in the power systems of new energy vehicles. Due to the structural characteristic that the stator is fitted onto the outer periphery of the rotor, heat is generated during rotor rotation and transferred to the stator. Excessive motor temperature directly affects its performance, and motors cannot operate at high temperatures for extended periods.

[0042] In an electric motor, the stator core is cylindrical, and the stator windings are embedded at both ends of the stator core and wrap around the ends of the stator core. In existing technology, a spray method is commonly used to cool the inside of the motor. Specifically, spray pipes are installed inside the motor, and cooling medium is sprayed into the motor through these pipes to cool the stator. However, because the spray range of the spray pipes is limited, it cannot completely cover the stator windings and stator core. The coolant can only exchange heat with the stator at the areas that can be sprayed. This cooling method suffers from limited spray range of the cooling medium, small contact area between the cooling medium and the motor stator, and can only cool the stator locally, resulting in low cooling efficiency. Furthermore, uneven cooling area can lead to localized overheating of the stator core or stator windings, affecting motor performance.

[0043] To address the aforementioned problems, this utility model provides an electric motor, including a housing, a stator and a rotor disposed within the housing, and a stator cooling structure. Without altering the stator structure in existing electric motors, the stator cooling structure encloses the stator windings and stator core. When stator cooling is required, coolant is introduced into the stator cooling structure, ensuring complete contact between the coolant and the surfaces of the stator windings and stator core, thereby achieving thorough and uniform cooling of the stator.

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0045] The structure of this type of motor will be described in general below.

[0046] like Figure 1As shown, the motor 1 includes a housing 10, a stator 20 and a rotor 30 disposed within the housing 10. The stator 20 is sleeved on the outer periphery of the rotor 30, and an air gap 40 is formed between the stator 20 and the rotor 30. The air gap 40 is an important area through which the magnetic field passes, and its size has certain requirements. For example, the air gap of a vehicle permanent magnet synchronous motor or a DC brushless motor is small. Only a small air gap can ensure the magnetic flux density required when the motor is working.

[0047] The motor 1 also includes a stator cooling structure 50, which includes two cooling covers 500 disposed opposite each other along the axial direction of the stator 20, and each cooling cover 500 is coaxially disposed with the stator 20 (the axial direction of the stator 20 is...). Figure 1 In the X direction, two cooling covers 500 are connected relative to each other from both ends of the stator 20 along the axial direction of the stator 20, so that the stator 20 is covered between the two cooling covers 500, and the two cooling covers 500 can surround each other to form a cooling space for the coolant to contact the stator 20.

[0048] like Figure 1 and Figure 2 As shown, each cooling shroud 500 includes an inner cylinder 501 and an outer cylinder 502 arranged sequentially from the inside to the outside along its radial direction, thereby aligning the cooling shroud 500 in the radial direction, which is also the radial direction of the stator 20. Figure 1 In the Y direction, the inner cylinder 501 is closer to the inner surface of the stator winding 210 inside the stator 20, and the outer cylinder 502 is closer to the outer surface of the stator core 200 outside the stator 20. The space created by the gap between the inner cylinder 501 and the outer cylinder 502 is used to accommodate part of the stator core 200 and the stator winding 210.

[0049] The inner cylinders 501 of the two cooling covers 500 are connected axially to the end of the stator core 200 near the stator core 200 and to the side near the rotor 30. The connection position is outside the air gap 40. Thus, the inner cylinders 501 isolate the stator winding 210 from the air gap 40, ensuring that the magnetic flux density of the air gap 40 of the motor 1 is not affected by the stator cooling structure 50. This is suitable for air gaps of different sizes, especially for motors with strict requirements on air gap size, such as permanent magnet synchronous motors and low-power brushless DC motors.

[0050] Each inner cylinder 501 has one end axially away from the stator core 200 that protrudes axially from the stator winding 210 and is connected to the corresponding outer cylinder 502 through a connecting part 503. The connecting part 503 connects the axial end of the inner cylinder 501 and the axial end of the outer cylinder 502. It should be noted that the connecting part 503 is specifically annular, with an inner diameter that matches the inner cylinder 501 and an outer diameter that matches the outer cylinder 502. Its function is to close the axial end of the inner cylinder 501 and the corresponding axial end of the outer cylinder 502. With this arrangement, the inner cylinder 501, connecting part 503, and outer cylinder 502 of the two oppositely arranged cooling shrouds 500 surround the stator core 200 of the stator 20 to form a cooling chamber 510. The stator winding 210 and the stator core 200 are housed in the cooling chamber 510. When the coolant flows into the cooling chamber 510 and reaches a certain amount, it comes into complete contact with the surface of the stator core 200 and the stator winding 210, so that the cooling area is maximized and the cooling efficiency is higher, which can achieve sufficient and uniform cooling of the stator 20.

[0051] The outer cylinders 502 of the two cooling covers 500 are connected to each other at their axial ends. It should be noted that the connection between the outer cylinders 502 of the two cooling covers 500 can be achieved by setting connection holes on the two outer cylinders 502 respectively, and connecting them with screws or other connecting parts that cooperate with the connection holes; alternatively, limiting parts that protrude radially inward are set at both ends of the motor housing 10 along its axial direction. When the housing 10 is fitted outside the cooling cover 500, the limiting parts abut against the two cooling covers 500, so that the two ends of the outer cylinders 502 of the two cooling covers 500 that are close to each other in their axial direction are connected to each other; alternatively, an end cap that is detachably connected to the housing 10 can be set at one end of the motor housing 10 along its axial direction, so that the side of the end cap close to the housing 10 abuts against the corresponding cooling cover 500, and a limiting part that protrudes radially inward is set at the other end of the housing 10, so that the two cooling covers 500 are limited by the limiting parts and the end cap respectively.

[0052] It is understandable that, in the axial direction of the cooling shroud 500, the side of the connecting portion 503 near the stator winding 210 can either fit snugly against the end of the stator winding 210, or it can maintain a certain gap with the end of the stator winding 210 (e.g., Figure 1 As shown, when the side of the connecting part 503 near the stator winding 210 maintains a certain gap with the end of the stator winding 210, the coolant can flow from the end winding through the gap of the stator 20 tooth groove, and flow into the stator winding 210 inside the stator core 200 to fully cool the stator winding 210.

[0053] In the radial direction of the cooling shroud 500, the outer wall surface of the inner cylinder 501 can be in contact with the side of the stator winding 210 near the rotor 30 (e.g., Figure 1As shown, a certain gap can also be maintained between the connecting part 503 and the end of the stator winding 210, and the outer wall of the inner cylinder 501 and the side of the stator winding 210 near the rotor 30. When a certain gap is maintained between the connecting part 503 and the end of the stator winding 210, and a certain gap is maintained between the outer wall of the inner cylinder 501 and the side of the stator winding 210 near the rotor 30, the coolant can flow into the gap to cool the end of the stator winding 210 and the side of the stator winding 210 near the rotor 30.

[0054] It should be noted that the coolant can be either cooling oil or cooling water, as long as it can achieve heat exchange with the stator 20 of the motor 1. Specifically, it can be cooling oil with good thermal and chemical stability.

[0055] In one specific embodiment, since the cooling chamber 510 composed of the two cooling shrouds 500 is the core area for heat exchange between the cooling oil and the stator 20, and the coolant absorbs a large amount of heat in it, it needs to be made of high-temperature resistant materials. For example, it can be polyetheretherketone (PEEK) or polyamide-imide (PAI), which are engineering plastics with high temperature resistance, corrosion resistance, insulation, and a certain strength.

[0056] In another specific implementation, such as Figure 1 As shown, the two cooling covers 500 are symmetrically arranged along the axial direction of the stator 20. The connection between the outer cylinders 502 of the two cooling covers 500 is located at the central axis of the stator 20. Therefore, only one size of cooling cover 500 needs to be designed during manufacturing, and it can be symmetrically installed from both ends of the motor 1 axis during installation.

[0057] The two cooling covers 500 are also provided with spaced liquid inlets 504 and liquid outlets 505. The liquid inlets 504 and liquid outlets 505 are respectively connected to the cooling chamber 510. As the coolant flows into the cooling chamber 510 from the liquid inlet 504 and flows out from the liquid outlet 505, it comes into contact with the stator winding 210 and the stator core 200, and carries away the heat generated by the motor 1 during operation.

[0058] It should be noted that the inlet 504 and outlet 505 can be respectively located on both radial sides of the same cooling shroud 500, or on both radial sides of different cooling shrouds 500, or at both axial ends of different cooling shrouds 500. The specific locations can be set according to needs. When the inlet 504 and outlet 505 are respectively located on both radial sides of the same cooling shroud 500 or on both radial sides of different cooling shrouds 500, the inlet 504 can be located above the outlet 505. After the coolant flows into the cooling chamber 510, it can flow downwards by its own gravity to exchange heat with the stator 20. When the inlet 504 and outlet 505 are located at both axial ends of different cooling shrouds 500, a pump structure can be installed near the outlet 505 to facilitate the discharge of the coolant after heat exchange. Furthermore, a cooler and a filter can be installed to cool and filter the coolant carrying heat after heat exchange, so that it can enter the next cooling cycle and allow the coolant to circulate.

[0059] In one embodiment of this utility model, such as Figure 1 As shown, the outer wall surface of the outer cylinder 502 of each cooling shroud 500 is connected to the inner wall surface of the housing 10. This arrangement ensures that the outer wall surface of the outer cylinder 502 fits snugly against the inner wall surface of the housing 10, preventing gaps. An inlet 504 and an outlet 505 are formed on the outer cylinder 502, and the housing 10 has at least two liquid outlets 100. These at least two liquid outlets 100 are respectively corresponding to and connected to the inlet 504 and outlet 505, allowing coolant to flow from one of the liquid outlets 100 of the housing 10 to the inlet 504 and into the cooling chamber 510. Within the cooling chamber 510, the coolant exchanges heat with the stator 20, and then flows through the outlet 505 to the other liquid outlet 100, thus completing the cooling of the stator 20.

[0060] It should be noted that the liquid outlet 100 can be set in two, three or more as needed, but its number must be consistent with the total number of liquid inlet 504 and liquid outlet 505 to ensure that both liquid inlet 504 and liquid outlet 505 are connected to the housing 10.

[0061] In one embodiment of this utility model, the liquid inlet 504 and the liquid outlet 505 are respectively formed on opposite sides of the outer cylinder 502 along the radial direction of the outer cylinder 502, and at least two liquid outlets 100 are correspondingly formed on opposite sides of the shell 10 along the radial direction of the shell 10. Further, as Figure 1 and Figure 2As shown, the inlet 504 and outlet 505 are formed on opposite sides of the outer cylinder 502 along its radial direction. This allows the coolant to flow from one side of the outer cylinder 502 to the other, along the radial direction of the outer cylinder 502, i.e., the stator 20, ensuring full contact with the stator winding 210 and stator core 200, thus improving heat exchange efficiency. When the inlet 504 is located above the outlet 505, the coolant enters the cooling chamber 510 and flows downwards to the outlet 505 under its own gravity, completing the cooling of the stator 20 during its descent.

[0062] In one embodiment of this utility model, such as Figure 1 As shown, at least two liquid flow channels 110 are formed on the housing 10. Each liquid flow channel 110 is arranged along the axial direction of the housing 10. At least two liquid flow channels 110 are connected to the cooling chamber 510 through corresponding liquid flow ports 100, inlets 504, or outlets 505, respectively, thus serving as channels for introducing coolant into the cooling chamber 510. The other liquid flow channel 110 is connected to its corresponding liquid flow port 100 and outlet 505, serving as a channel for discharging coolant, allowing the coolant carrying heat that has flowed out of the cooling chamber 510 after heat exchange to enter the next coolant circulation process. The purpose of arranging each liquid flow channel 110 along the axial direction of the housing 10 is to facilitate the introduction of coolant from the axial end of the housing 10 into the liquid flow channel 110. It can be understood that the axial direction of the housing 10 is the same as the axial direction of the stator 20, i.e. Figure 1 The X direction in the equation.

[0063] It should be noted that two, three, or more fluid flow channels 110 can be provided as needed, and they can be arranged along the circumference of the housing 10, as long as they can provide inlet and outlet paths for the coolant on the housing 10. Specifically, two fluid flow channels 110 can be provided, located in the radial direction of the motor 1 housing 10 (and...). Figure 1 The two sides of the middle stator 20 in the radial direction Y are in the same direction. Each liquid flow channel 110 can be configured to connect to one or more liquid flow ports 100 as needed, as long as the coolant in the liquid flow channel 110 can be guided into the cooling chamber 510. Specifically, each liquid flow channel 110 can be configured to connect to two liquid flow ports 100.

[0064] In one embodiment of this utility model, such as Figure 1 As shown, one of the liquid flow channels 110 is connected to two liquid flow ports 100. The two liquid flow ports 100 are arranged along the extension direction of the liquid flow channel 110 and are located at both ends of the liquid flow channel 110. The two liquid flow ports 100 are respectively connected to a liquid inlet 504, and the liquid inlet 504 is respectively located at both ends of the stator 20.

[0065] Specifically, one of the flow channels 110 for introducing coolant is connected to two flow ports 100. The two flow ports 100 are arranged along the extension direction of the flow channel 110, that is, the arrangement direction of the flow ports 100 for introducing coolant is parallel to the extension direction of the flow channel 110 and is located at both ends of the flow channel 110. The two flow ports 100 are respectively connected to a liquid inlet 504 corresponding to the end of the stator 20. Thus, after the coolant enters the flow channel 110, it flows into the cooling chamber 510 from the corresponding flow ports 100 and liquid inlets 504, and first contacts the stator winding 210 at the end of the stator 20, giving priority to cooling the stator winding 210. As the coolant gradually fills the cooling chamber 510, the contact area with the stator winding 210 and the stator core 200 gradually increases until it is in complete contact with the stator 20 and is fully cooled.

[0066] Another liquid flow channel 110 is connected to two other liquid flow ports 100. The other two liquid flow ports 100 are arranged along the extension direction of the liquid flow channel 110 and are respectively connected to a liquid outlet 505.

[0067] Specifically, another flow channel 110 for discharging coolant is connected to two flow ports 100. The two flow ports 100 are arranged along the extension direction of the flow channel 110, that is, the arrangement direction of the flow ports 100 for discharging coolant is parallel to the extension direction of the flow channel 110. Since there is a lot of coolant accumulated in the cooling chamber 510, the efficiency of coolant discharge can be improved by setting two flow ports 100 connected to the outlet 505.

[0068] It should be noted that the two liquid outlets 100 corresponding to the liquid outlet 505 can be set in the center of the housing 10 along the axial direction or at both ends of the housing 10, as long as the coolant can be discharged. Specifically, they can be set at both ends of the housing 10 along the axial direction, symmetrical to the liquid inlet 504, so that the discharge rate is more uniform.

[0069] In one embodiment of this utility model, such as Figure 1 As shown, the inlet area of ​​the liquid inlet 504 and the outlet area of ​​the liquid outlet 505 are both larger than the flow area of ​​the liquid outlet 100.

[0070] Specifically, since the inlet 504 and outlet 505 are respectively corresponding to and connected to the outlet 100, the inlet area of ​​the inlet 504 is larger than the outlet area of ​​the outlet 100. Therefore, the size of the outlet area of ​​the outlet 100 corresponding to the inlet 504 determines the flow rate of the coolant flowing into the cooling chamber 510. The outlet area of ​​the outlet 505 is larger than the outlet area of ​​the outlet 100 corresponding to it. Therefore, the size of the outlet area of ​​the outlet 100 corresponding to the outlet 505 determines the flow rate of the coolant flowing out of the cooling chamber 510. In addition, the above arrangement can also reduce the positioning accuracy requirements between holes during installation.

[0071] In one embodiment of this utility model, such as Figure 1 and Figure 4 As shown, the motor 1 also includes an end cover 60 disposed at one end of the housing 10. A plurality of threaded connection portions 130 are evenly spaced on the outer periphery of the end of the housing 10 near the end cover 60. The end cover 60 is evenly spaced along its circumference with a plurality of through holes 600 that match the plurality of threaded connection portions 130. By inserting fasteners 70 into each of the plurality of through holes 600 and the corresponding threaded connection portion 130, the housing 10 and the end cover 60 are threadedly connected.

[0072] Specifically, the threaded connection between the end cap 60 and the housing 10 facilitates disassembly. When installing the cooling cover 500, the end cap 60 needs to be removed, the housing 10 is fitted onto the outside of the cooling cover 500, and then the end cap 60 is fixed to the housing 10 using fasteners 70. The end cap 60 can limit the movement of its corresponding cooling cover 500. The side of the end cap 60 closest to the housing 10 abuts against the outer surface of the connecting part 503 of the corresponding cooling cover 500 to prevent the cooling cover 500 from being affected by the rotation of the motor 1 along the axial direction. Figure 1 (in the X direction) disengagement; in addition, the shaft of motor 1 can pass through the center of end cover 60, and end cover 60 provides support for the shaft.

[0073] It should be noted that the threaded connection part 130 can be as follows: Figure 1 and Figure 4 As shown, there is a slot with an opening facing the end cover 60. The inner wall of the slot has an internal thread, or it can be a through hole with an internal thread on the inner wall. The fastener 70 is a bolt with an external thread. The bolt passes through the through hole 600 of the end cover 60 and engages with the internal thread of the threaded connection part 130 to fix the housing 10 and the end cover 60.

[0074] It should also be noted that the threaded connection portion 130 can be provided in two, three, or more forms as needed, and correspondingly, the through hole 600 can also be provided in two, three, or more forms as needed, as long as the end cap 60 can be fixedly connected to one end of the housing 10. For example... Figure 4As shown, three threaded connection parts 130 and three through holes 600 can be evenly spaced, and three fasteners 70 are required for connection.

[0075] like Figure 3 As shown, the other end of the housing 10 protrudes axially from one end of the corresponding cooling shroud 500, and a protrusion 120 is formed radially thereon, the protrusion 120 abutting against the outer surface of the connecting portion 503 of the corresponding cooling shroud 500.

[0076] Specifically, the protrusion 120 formed at one end of the housing 10, which protrudes radially inward, can limit the corresponding cooling cover 500 and abut against the outer surface of the connecting part 503 to prevent the cooling cover 500 from detaching axially due to the rotation of the motor 1.

[0077] It should be noted that the protrusion 120 can be a boss structure or a rod-shaped structure, as long as it can limit the connection part 503. One or more protrusions 120 can be provided as needed. When multiple protrusions 120 are provided, they are arranged along the circumference of the housing 10 and protrude radially inward, which can limit the connection part 503 at multiple points and improve the limiting effect. Specifically, three protrusions can be evenly arranged along the circumference of the housing 10 to form a three-point limiting for the connection part 503.

[0078] To facilitate understanding of the usage of the motor 1 provided in this embodiment by those skilled in the art, the installation and usage process of the motor 1 provided in the above embodiment will be described below.

[0079] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, when installing the stator cooling structure 50, those skilled in the art will bring the two cooling covers 500 closer together from the two axial ends of the stator 20 until the opposite ends of the outer cylinders 502 of the two cooling covers 500 are connected to each other. The end caps 60 on the housing 10 are removed, and the housing 10 is fitted along its axial direction onto the outer periphery of the two outer cylinders 502, so that the protrusion 120 at one end of the housing 10 abuts against the connecting part 503 of one of the cooling covers 500. Then, the end caps 60 are fixedly connected to the other end of the housing 10 by fasteners 70, so that the side of the end caps 60 near the housing 10 abuts against the connecting part 503 of the other cooling cover 500, thereby limiting the two cooling covers 500 inside the housing 10, and the two cooling covers 500 completely cover the stator 20; or the two cooling covers 500 can be connected by connecting holes and connecting parts at the connection of the outer cylinders 502 of the two cooling covers 500. The assembly method between the cooling covers 500 and the housing 10 is simple, and the manufacturing process is simple and easy to implement.

[0080] After installation, coolant is injected through inlet 504, allowing it to enter the cooling chamber 510 and contact the stator 20. With inlet 504 and outlet 505 located on opposite radial sides of the stator cooling structure 50, and each cooling cover 500 having one inlet 504 and one outlet 505, the inlet 504 corresponds to the stator winding 210. Therefore, when the coolant enters the cooling chamber 510, it first contacts the stator winding 210. As coolant is continuously injected into the cooling chamber 510, it accumulates from bottom to top until the stator winding 210 and stator core 200 are completely immersed in the coolant, maximizing the cooling area and increasing cooling efficiency, thus achieving sufficient and uniform cooling of the stator 20. This configuration requires corresponding liquid flow channels 110 on opposite radial sides of the housing 10, with each channel 110 connecting to two outlets 100. Alternatively, the inlet 504 and outlet 505 can be respectively located at both ends of the stator cooling structure 50 and on the same side. That is, the inlet 504 and outlet 505 are respectively opened on the two cooling covers 500. After the coolant enters the cooling chamber 510, it first contacts one end of the stator 20. A pump structure can be set near the outlet 505 to discharge the cooled coolant from the outlet 505 at the other end. During this process, the coolant flows from one end of the stator 20 to the other end along the axial direction of the stator 20. As the coolant accumulates in the cooling chamber 510, the stator winding 210 and the stator core 200 are completely immersed in the coolant, so that the cooling area is maximized and the cooling efficiency is higher, and the stator 20 can be fully and uniformly cooled. In this configuration, only a liquid flow channel 110 needs to be provided on one radial side of the housing 10. The liquid flow channel 110 is connected to two liquid flow ports 100, and the liquid inlet 504, liquid outlet 505 or the corresponding liquid flow port 100 can be selectively opened and closed. When coolant is introduced, the liquid flow channel 110 is connected to the liquid inlet 504 but not to the liquid outlet 505. When coolant is discharged, the liquid flow channel 110 is connected to the liquid outlet 505 but not to the liquid inlet 504.

[0081] When the heat exchange time between the stator winding 210, the stator core 200 and the coolant reaches the preset time, the outlet 505 is opened and the coolant is discharged from the cooling chamber 510, completing one heat exchange process.

[0082] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived from the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0083] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0084] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0085] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0086] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An electric motor, comprising a housing, a stator and a rotor disposed within the housing, the stator being sleeved on the outer periphery of the rotor and forming an air gap between them, characterized in that, The motor further includes a stator cooling structure, which comprises two cooling covers arranged opposite each other along the axial direction of the stator, and each cooling cover being coaxial with the stator. Each cooling shroud includes an inner cylinder and an outer cylinder arranged radially from the inside to the outside, and also includes a connecting portion connecting one axial end of the inner cylinder and one axial end of the outer cylinder; the other axial ends of the outer cylinders of the two cooling shrouds are connected to each other, and the other axial ends of the inner cylinders of the two cooling shrouds are respectively connected to the axial end of the stator core of the stator and the side close to the rotor, with the connection position located outside the air gap; The inner cylinders, connecting portions, and outer cylinders of the two cooling shrouds surround the stator to form a cooling chamber, and the stator windings and stator core of the stator are housed within the cooling chamber; The two cooling covers are also provided with spaced-apart liquid inlets and outlets, which are respectively connected to the cooling chamber.

2. The motor as described in claim 1, characterized in that, The outer wall of the outer cylinder of each cooling shroud is connected to the inner wall of the housing. The liquid inlet and the liquid outlet are formed on the outer cylinder, and at least two liquid outlets are provided on the housing. The at least two liquid outlets are respectively corresponding to the liquid inlet and the liquid outlet and are interconnected with each other.

3. The motor as described in claim 2, characterized in that, The liquid inlet and the liquid outlet are respectively formed on opposite sides of the outer cylinder along the radial direction of the outer cylinder, and at least two liquid outlets are correspondingly formed on opposite sides along the radial direction of the shell.

4. The motor as described in claim 2, characterized in that, At least two liquid flow channels are formed on the housing, each liquid flow channel is arranged along the axial direction of the housing, and the at least two liquid flow channels are respectively connected to the cooling chamber through the corresponding liquid flow port, the liquid inlet or the liquid outlet.

5. The motor as described in claim 4, characterized in that, One of the liquid flow channels is connected to two liquid flow ports, the two liquid flow ports are arranged along the extension direction of the liquid flow channel and are located at both ends of the liquid flow channel, the two liquid flow ports are respectively connected to one liquid inlet, and the liquid inlets are respectively located at both ends of the stator; Another liquid flow channel is connected to two other liquid flow ports, which are arranged along the extension direction of the liquid flow channel and are respectively connected to one of the liquid outlets.

6. The motor as described in claim 2, characterized in that, The inlet area of ​​the liquid inlet and the outlet area of ​​the liquid outlet are both larger than the flow area of ​​the liquid outlet.

7. The motor as described in claim 1, characterized in that, The motor also includes an end cap disposed at one end of the housing. The outer periphery of the housing near the end cap is evenly spaced with a plurality of threaded connection portions. The end cap is evenly spaced with a plurality of through holes that match the plurality of threaded connection portions. Fasteners are inserted into each of the plurality of through holes and the corresponding threaded connection portions to make the housing and the end cap threadedly connected. The other end of the housing protrudes axially from one end of the corresponding cooling shroud, and the other end of the housing has a protrusion formed radially therein, the protrusion abutting against the outer surface of the connecting portion of the corresponding cooling shroud.

8. The motor as described in claim 7, characterized in that, The protrusions are formed in multiple portions along the circumference of the housing.

9. The motor as described in claim 1, characterized in that, The cooling cover is made of high-temperature resistant material.

10. The motor according to any one of claims 1-9, characterized in that, The two cooling covers are arranged symmetrically along the axial direction of the stator.

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