Motor with cooling structure
By setting concave-convex circulating channels on the motor housing and end caps, the problem of complex or easy-to-process cooling water channel structures for water-cooled motors but poor heat dissipation effect is solved, achieving efficient heat dissipation and expandability.
Patent Information
- Application Number
- CN202520161430.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-23
AI Technical Summary
Existing water-cooled motor cooling channel structures have problems such as good heat dissipation but complex processing and lack of expandability, or easy processing but poor heat dissipation.
The motor housing is equipped with housing flow channels and sealing flow channels, which, together with the flow channels on the front and rear end covers, form a concave-convex circulating flow channel, increasing the heat exchange area and improving heat dissipation capacity.
It achieves simple processing, expandability, and improves heat transfer coefficient and heat dissipation capacity.
Smart Images
Figure CN223771864U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor cooling technology, specifically to a motor with a cooling structure. Background Technology
[0002] With the continuous development of high-power-density motor technology, the size of motors is constantly being reduced. Due to the significant reduction in motor size, the current density and magnetic field strength per unit volume increase accordingly, leading to increased internal losses. These losses are ultimately converted into heat energy, causing a rise in motor temperature. Excessive temperature rise not only affects the motor's operating efficiency and lifespan but may also cause problems such as aging of insulation materials and thermal expansion of mechanical components. Therefore, effectively controlling motor temperature rise has become a key technical challenge that urgently needs to be solved in the field of high-efficiency motors.
[0003] Against this backdrop, the cooling performance of high-efficiency motors has become a crucial factor determining their operational stability and reliability. Traditional air cooling, relying on air convection for heat dissipation, is no longer sufficient to meet the heat dissipation requirements of modern high-performance motors under high loads; especially in applications with strict requirements for motor vibration and noise, the limitations of air cooling are even more pronounced. To address these challenges, active cooling technologies such as water cooling and oil cooling have emerged and are gradually replacing traditional air-cooled motors.
[0004] Water-cooled motors directly remove heat generated by the motor through an internal circulating water system, providing efficient, uniform, and stable heat dissipation. Furthermore, water cooling offers greater safety compared to oil cooling, avoiding the risks of fire or environmental pollution that could result from oil leaks. It is also relatively inexpensive and easy to promote and apply. Therefore, water cooling technology is considered a relatively ideal and economical cooling solution for addressing the problem of high temperature rise in motors, and it is being increasingly widely used and promoted in the motor industry.
[0005] Currently, water-cooled motors have cooling channels in various forms, including spiral channels and axial channels. Spiral channels typically consist of inner and outer water jackets. Spiral grooves are created on the outer wall of the inner water jacket, which is then sealed by the outer water jacket, forming the final spiral channel. This type of channel structure is complex to manufacture and lacks scalability. Axial channels, on the other hand, use a stretched housing. While this allows for flexible changes in housing length, provides scalability, and is easy to manufacture, its heat dissipation performance is inferior to that of spiral channels. Utility Model Content
[0006] This invention addresses the technical problems of existing water-cooled motor cooling channel structures, which either have good heat dissipation but are complex to manufacture and lack scalability, or are easy to manufacture and scalable but have poor heat dissipation. The invention proposes a motor with a cooling structure, in which a housing flow channel and a blocking flow channel are provided on the motor housing, combined with end cover flow channels on the front and rear end covers, forming a concave-convex circulating flow channel. This design simplifies manufacturing, improves motor scalability, increases the heat transfer coefficient and heat transfer area, and enhances heat dissipation capacity.
[0007] The technical solution of this utility model:
[0008] An electric motor with a cooling structure includes:
[0009] The motor housing has multiple housing flow channels axially extending through it, and the first axial end of the motor housing is provided with several first blocking flow channels.
[0010] The first end cover is assembled on the first axial end of the motor housing, and the first end cover is provided with a plurality of first end cover flow channels.
[0011] The second end cap is assembled on the axial second end of the motor housing. The second end cap is provided with a plurality of second end cap flow channels, and the second end cap is also provided with an inlet flow channel and an outlet flow channel.
[0012] The inlet flow channel, half of the housing flow channels, the first sealing flow channel, and the second end cap flow channel are combined to form a first serpentine flow channel unit. The outlet flow channel, the other half of the housing flow channels, and the first end cap flow channel are combined to form a second serpentine flow channel unit. The first serpentine flow channel unit and the second serpentine flow channel unit are connected end to end through a second end cap flow channel. The first serpentine flow channel unit and the second serpentine flow channel unit are interlocked, such that each housing flow channel in the first serpentine flow channel unit is adjacent to one housing flow channel in the second serpentine flow channel unit.
[0013] Furthermore, the first blocking flow channel includes a first connecting groove and a first blocking block. The first connecting groove connects two adjacent housing flow channels at the first axial end of the motor housing. The first blocking block closes the first connecting groove. The first blocking flow channel and the second end cap flow channel form curved flow channels on both sides of the first serpentine flow channel unit.
[0014] Furthermore, the second axial end of the motor housing is provided with several second sealing channels; the liquid outlet channel, the other half of the housing channels, the second sealing channels and the first end cap channel cooperate to form the second serpentine channel unit.
[0015] Furthermore, the first blocking flow channel includes a first connecting groove and a first blocking block. The first connecting groove connects two adjacent housing flow channels at the first axial end of the motor housing. The first blocking block closes the first connecting groove. The first blocking flow channel and the second end cap flow channel form curved flow channels on both sides of the first serpentine flow channel unit. The second blocking flow channel includes a second connecting groove and a second blocking block. The second connecting groove connects two adjacent housing flow channels at the second axial end of the motor housing. The second blocking block closes the second connecting groove. The second blocking flow channel and the first end cap flow channel form curved flow channels on both sides of the second serpentine flow channel unit.
[0016] Furthermore, the number of the housing flow channels is 4M, where M is a positive integer; the number of the first end cover flow channels and the second end cover flow channels are M each.
[0017] Furthermore, a first sealing ring is provided between the first end cap flow channel and the motor housing, and a second sealing ring is provided between the second end cap flow channel and the motor housing; an inlet sealing ring is provided between the liquid inlet flow channel and the motor housing, and an outlet sealing ring is provided between the liquid outlet flow channel and the motor housing.
[0018] Furthermore, the plurality of housing flow channels are evenly distributed along the cross-sectional profile of the motor housing.
[0019] Furthermore, the multiple housing flow channels are evenly distributed along the circumferential direction.
[0020] Furthermore, the motor is a water-cooled motor.
[0021] After adopting the above technical solution, the motor with cooling structure provided by this utility model has the following beneficial effects compared with the prior art: The motor with cooling structure provided by this utility model forms a concave-convex circulating flow channel. While the coolant carries away the heat of the motor, heat exchange also occurs between two adjacent housing flow channels in the concave-convex circulating flow channel, as well as between the blocked flow channel and the corresponding end cover flow channel, thus improving the heat transfer coefficient. Moreover, this utility model also has flow channels on the first end cover and the second end cover, increasing the heat transfer area. In this way, the heat transfer coefficient of the high-efficiency motor using a stretched housing in the prior art is improved, the heat transfer area is increased, the heat dissipation capacity is enhanced, and the heat dissipation effect is good. Attached Figure Description
[0022] Figure 1 This is an exploded view of the structure of the motor of this utility model;
[0023] Figure 2 This is a schematic diagram of the circulating flow channel of the motor of this utility model;
[0024] Figure 3This is a schematic diagram showing the unfolded circulation channel of the motor of this utility model;
[0025] Figure 4 for Figure 3 The first serpentine flow channel unit in the circulating flow channel shown (the area through which the arrow passes);
[0026] Figure 5 for Figure 3 The second serpentine flow channel unit in the circulating flow channel shown (the area through which the arrow passes);
[0027] Figure 6 This is a cross-sectional structural diagram of the motor housing of this utility model;
[0028] Figure 7 This is a schematic diagram of the structure of the first axial end of the motor housing of this utility model;
[0029] Figure 8 This is a schematic diagram of the structure of the second axial end of the motor housing of this utility model;
[0030] Figure 9 This is a schematic diagram of the structure of the first end cap of this utility model;
[0031] Figure 10 This is a schematic diagram of the structure of the second end cap of this utility model.
[0032] in,
[0033] Motor housing 1, housing flow channel 11, first blocking flow channel 12, first connecting groove 121, first blocking block 122, second blocking flow channel 13, second connecting groove 131, second blocking block 132;
[0034] First end cap 2, first end cap flow channel 21;
[0035] Second end cap 3, second end cap flow channel 31, liquid inlet flow channel 32, liquid inlet 321, liquid outlet flow channel 33, liquid outlet 331; Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0038] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.
[0039] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0040] The purpose of this embodiment is to provide a motor with a cooling structure, especially a water-cooled motor. The motor has a circulating flow channel formed inside. The circulating flow channel is formed by the cooperation of various flow channels provided in the motor housing 1, the first end cover 2, and the second end cover 3, which increases the heat exchange area and improves the heat dissipation capacity.
[0041] Specifically, such as Figure 1-3 As shown, the middle part of the motor housing 1 is hollow, which is used to house components such as the stator and rotor. These components are also the ones that generate a lot of heat and need to be cooled. Multiple housing flow channels 11 are formed through the shell wall of the motor housing 1. These housing flow channels 11 are arranged in parallel and parallel to the axial direction of the motor housing 1. The motor housing 1 can be a stretched housing, and its length can be extended as needed, with good expandability.
[0042] Furthermore, a plurality of first sealing channels 12 are provided at the first axial end of the motor housing 1, and a plurality of second sealing channels 13 are provided at the second axial end of the motor housing 1. The first end cover 2 is assembled to the first axial end of the motor housing 1 by means of screws or the like, and a plurality of first end cover channels 21 are provided on the side of the first end cover 2 facing the motor housing 1; the second end cover 3 is assembled to the second axial end of the motor housing 1 by means of screws or the like, and a plurality of second end cover channels 31 are provided on the side of the second end cover 3 facing the motor housing. The first end cover 2 may be the front end cover of the motor, and the second end cover 3 may be the rear end cover of the motor; or, in other embodiments, the first end cover 2 may also be the rear end cover of the motor, and the second end cover 3 may be the front end cover of the motor.
[0043] The motor's circulation channel includes an inlet channel 32 and an outlet channel 33. The inlet channel 32 is the channel for coolant inflow, with its outer end forming an inlet 321. The outlet channel 33 is the channel for coolant outflow, with its outer end forming an outlet 331. The coolant can be water or a water-based coolant with additives such as ethylene glycol. The coolant is drawn from the coolant tank by a pump, enters the motor through the inlet 321, and flows back to the coolant tank through the outlet 331 after passing through the motor's circulation channel. Preferably, the inlet channel 32 and the outlet channel 33 are both located on the second end cover 3, which facilitates the subsequent installation and connection of pipelines, such as... Figure 3 As shown, the inlet channel 32 is located on the right side and the outlet channel 33 is located on the left side. Alternatively, in other embodiments, the inlet channel 32 can be located on the left side and the outlet channel 33 can be located on the right side, i.e., the coolant flows in reverse.
[0044] like Figure 4 As shown, the inlet channel 32, half of the housing channels 11, the first sealing channel 12, and the second end cap channel 31 cooperate to form a first serpentine channel unit. The inlet channel 32 is the head end of the first serpentine channel unit. The half of the housing channels 11 are the direct channels in the first serpentine channel unit. The first sealing channel 12 is a curved channel on one side of the first serpentine channel unit that connects two adjacent housing channels 11. The second end cap channel 31 is a curved channel on the other side of the first serpentine channel unit that connects two housing channels 11.
[0045] like Figure 5As shown, the outlet flow channel 33, the other half of the housing flow channels 11, the second sealing flow channel 13, and the first end cap flow channel 21 cooperate to form a second serpentine flow channel unit. The outlet flow channel 33 is the tail end of the second serpentine flow channel unit. The other half of the housing flow channels 11 are the straight channels in the second serpentine flow channel unit. The second sealing flow channel 13 is a curved flow channel on one side of the second serpentine flow channel unit that connects two adjacent housing flow channels 11. The first end cap flow channel 21 is a curved flow channel on the other side of the second serpentine flow channel unit that connects two housing flow channels 11.
[0046] The first serpentine flow channel unit and the second serpentine flow channel unit are connected end to end, for example... Figure 3 As shown, the tail end of the first serpentine flow channel unit is the rightmost second end cap flow channel 31, and the head end of the second serpentine unit is the rightmost housing flow channel 11, and the two are connected. Furthermore, the first and second serpentine flow channel units are interlocked, such that each housing flow channel 11 in the first serpentine flow channel unit is adjacent to a housing flow channel 11 in the second serpentine flow channel unit.
[0047] by Figure 3As shown in the example, it includes one inlet channel 32, one outlet channel 33, 20 housing channels 11, five first end cap channels 21, five second end cap channels 31, five first sealing channels 12, and four second sealing channels 13. The coolant flows into the motor housing 1 through the inlet channel 32 on the second end cap 3. In the motor housing 1, it flows back and forth through the second (counting from left to right, the same below) housing channel 11, the first first sealing channel 12, and the third housing channel 11 before flowing back to the second end cap 3. After passing through the first second end cap channel 31, it flows back into the motor housing 1. The first second end cap channel 31 spans four housing channels 11. The coolant flows back to the second end cap 3 after five round trips and then through the fifth second end cap channel 31. After 1, it flows back into the motor housing 1. The 5th second end cover flow channel 31 spans two housing flow channels 11. The coolant begins to enter the second serpentine flow channel unit from the first serpentine flow channel unit. The coolant flows through the 20th housing flow channel 11, the 5th first end cover flow channel 21, then through the 17th housing flow channel 11, the 4th second blockage flow channel 13, and the 16th housing flow channel 11, making a round trip before flowing back to the first end cover 2. After passing through the 4th first end cover flow channel 21, it flows back into the motor housing 1. The 5th first end cover flow channel 21 spans four housing flow channels 11. After four round trips, the coolant flows back to the first end cover 2, passes through the 1st first end cover flow channel 21, and flows back into the motor housing 1. After passing through the 1st housing flow channel 11, it finally flows out from the outlet flow channel 33. The second housing flow channel 11, the first first sealing flow channel 12, and the third housing flow channel 11 are convex, while the fourth housing flow channel 11, the first first end cap flow channel 21, and the first housing flow channel 11 are concave. The fourth housing flow channel 11, the first second sealing flow channel 13, and the fifth housing flow channel 11 are convex, while the third housing flow channel 11, the first second end cap flow channel 31, and the sixth housing flow channel 11 are concave. This interlocking of convex and concave shapes ensures that each housing flow channel 11 in the first serpentine flow channel unit is adjacent to a housing flow channel 11 in the second serpentine flow channel unit.
[0048] After the coolant enters the motor's circulation channel, it absorbs the motor's heat. Furthermore, the temperature of the coolant in the second serpentine flow channel unit is higher than that in the first serpentine flow channel unit. While carrying away heat from the motor, the coolant in the housing flow channel 11 of the first serpentine flow channel unit also exchanges heat with the coolant in the housing flow channel 11 of the second serpentine flow channel unit, further improving the heat transfer coefficient. In addition, this embodiment also has flow channels on the first end cover 2 and the second end cover 3, allowing for heat dissipation at these locations, increasing the heat exchange area and further enhancing the heat dissipation capacity. Compared with existing technologies, the motor with a cooling structure provided in this embodiment is simple to manufacture, has scalability, and improves the heat transfer coefficient, increases the heat exchange area, and enhances the heat dissipation capacity.
[0049] In this embodiment, the number of housing flow channels 11 is 4M, where M is a positive integer; the number of first end cover flow channels 21 and second end cover flow channels 31 are each M, which can be adapted to the size of the motor. The number of second sealing flow channels 13 is one less than the number of first sealing flow channels 12, and the second sealing flow channels 13 and the first sealing flow channels 12 are staggered sequentially. The M first end cover flow channels 21 arranged in the first end cover 2 are all long flow channels spanning 4 housing flow channels 11; the M second end cover flow channels 31 arranged in the second end cover 3 include M-1 long flow channels spanning 4 housing flow channels 11 and 1 short flow channel spanning 2 housing flow channels 11.
[0050] When M≥2, it includes at least two first blocking channels 12 and one second blocking channel 13. For example, corresponding to Figure 3 As shown, M is 5, comprising 5 first sealing flow channels 12 and 4 second sealing flow channels 13, and 5 first end cap flow channels 21 and 5 second end cap flow channels 31. At this time, the inlet flow channel 32, half of the housing flow channels 11, the first sealing flow channels 12, and the second end cap flow channels 31 cooperate to form a first serpentine flow channel unit, and the outlet flow channel 33, the other half of the housing flow channels 11, the second sealing flow channels 13, and the first end cap flow channels 21 cooperate to form a second serpentine flow channel unit.
[0051] When M=1, it includes one first blocking flow channel 12, but no second blocking flow channel 13. That is, it only includes... Figure 3 The four casing flow channels 11, from the first to the fourth, only include... Figure 3 The first end cap flow channel 21, and only including Figure 3The first second end cap flow channel 31 is formed as a short flow channel that only spans the third and fourth housing flow channels 11. At this time, the first serpentine flow channel unit is still formed by the liquid inlet flow channel 32, half of the housing flow channels 11, the first sealing flow channel 12 and the second end cap flow channel 31, while the second serpentine flow channel unit is formed by the liquid outlet flow channel 33, the other half of the housing flow channels 11 and the first end cap flow channel 21.
[0052] like Figure 4 , 7 As shown, the first blocking channel 12 includes a first connecting groove 121 and a first blocking block 122. The first connecting groove 121 is formed at the first axial end of the motor housing 1 and can be milled by machining. The first connecting groove 121 connects two adjacent housing channels 11 at the first axial end and is closed by the first blocking block 122. The first blocking block 122 is set in the same shape as the groove of the first connecting groove 121, and can be blocked by means of interference fit, glue bonding, friction stir welding, etc. After installation, the outer surface of the first blocking block 122 is preferably flush with the end face of the first axial end of the motor housing 1.
[0053] Similarly, when a second blocking channel 13 exists, such as Figure 5 , 8 As shown, the second blocking channel 13 includes a second connecting groove 131 and a second blocking block 132. The second connecting groove 131 is formed at the second axial end of the motor housing 1 and can be milled out by machining. The second connecting groove 131 connects two adjacent housing channels 11 at the second axial end and is closed by the second blocking block 132. The second blocking block 132 is configured to conform to the groove opening of the second connecting groove 131 and can be blocked by means of interference fit, glue bonding, friction stir welding, etc. After installation, the outer surface of the second blocking block 132 is preferably flush with the end face of the second axial end of the motor housing 1.
[0054] In this embodiment, the first sealing channel 12 is close to a first end cap channel 21, so that the coolant with a lower temperature in the first sealing channel 12 can exchange heat with the coolant with a higher temperature in the corresponding first end cap channel 21, further improving the heat exchange effect; similarly, the second sealing channel 13 is close to a second end cap channel 31, so that the coolant with a lower temperature in the second end cap channel 31 can exchange heat with the coolant with a higher temperature in the corresponding second sealing channel 13, further improving the heat exchange effect.
[0055] In this embodiment, a first sealing ring (not shown in the figure) is also provided between the first end cap flow channel 21 and the motor housing 1. Several sealing ring grooves can be machined on the first axial end of the motor housing 1, and then the first sealing rings are installed. After the first end cap 2 is assembled, the outer ring of each first end cap flow channel 21 is sealed. Similarly, a second sealing ring (not shown in the figure) is provided between the second end cap flow channel 31 and the motor housing 1. For example, several sealing ring grooves can be machined on the second axial end of the motor housing 1, and then the second sealing rings are installed. After the second end cap 3 is assembled, the outer ring of each second end cap flow channel 31 is sealed. In addition, similarly, an inlet sealing ring (not shown in the figure) is provided between the liquid inlet flow channel 32 of the second end cap 3 and the motor housing 1, and an outlet sealing ring (not shown in the figure) is provided between the liquid outlet flow channel 33 of the second end cap 3 and the motor housing 1. Corresponding sealing ring grooves can be machined on the second axial end of the motor housing 1, and then the corresponding sealing rings are installed.
[0056] In this embodiment, multiple housing flow channels 11 are evenly distributed along the cross-sectional contour of the motor housing 1, resulting in more uniform overall heat dissipation. For example... Figure 6 As shown, when the cross-sectional profile of the motor housing 1 cut along the direction perpendicular to the axis is approximately annular, multiple housing flow channels 11 are evenly arranged around the axis in the circumferential direction, and the cross-sectional dimensions of each motor housing 1 are also the same. Figure 9-10 As shown, the first end cap flow channel 21 on the first end cap 2 is also arranged in a corresponding circumferential direction, and the second end cap flow channel 31 on the second end cap 3 is also arranged in a corresponding circumferential direction.
[0057] As can be seen from the above, the motor with a cooling structure provided in this embodiment has a housing flow channel and a blocking flow channel on the motor housing, which, together with the end cover flow channels on the front and rear end covers, form a concave-convex circulating flow channel. This is simple to process, has good expandability, and improves the heat transfer coefficient, increases the heat transfer area, and enhances the heat dissipation capacity.
[0058] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. An electric machine having a cooling structure, characterized by, The utility model relates to a motor casing (1) is axially formed with a plurality of casing flow channels (11), and the axial first end of the motor casing (1) is provided with a plurality of first blocking flow channels (12). A first end cover (2) is assembled to the axial first end of the motor casing (1), and the first end cover (2) is provided with a plurality of first end cover flow channels (21). A second end cover (3) is assembled to the axial second end of the motor casing (1), and the second end cover (3) is provided with a plurality of second end cover flow channels (31), and the second end cover (3) is further provided with a liquid inlet flow channel (32) and a liquid outlet flow channel (33). The liquid inlet flow channel (32), half of the casing flow channels (11), the first blocking flow channels (12) and the second end cover flow channels (31) cooperate to form a first serpentine flow channel unit, the liquid outlet flow channel (33), the other half of the casing flow channels (11) and the first end cover flow channels (21) cooperate to form a second serpentine flow channel unit, and the first serpentine flow channel unit and the second serpentine flow channel unit are connected in series through one second end cover flow channel (31). The first serpentine flow channel unit and the second serpentine flow channel unit are concave-convexly embedded, so that each casing flow channel (11) in the first serpentine flow channel unit is adjacent to one casing flow channel (11) in the second serpentine flow channel unit. The axial second end of the motor casing (1) is further provided with a plurality of second blocking flow channels (13), and the liquid outlet flow channel (33), the other half of the casing flow channels (11), the second blocking flow channels (13) and the first end cover flow channels (21) cooperate to form the second serpentine flow channel unit.
2. The electric machine with a cooling structure according to claim 1, characterized in that, The number of the casing flow channels (11) is 4M, and M is a positive integer; the number of the first end cover flow channels (21) and the second end cover flow channels (31) is M, respectively.
3. The electric machine with a cooling structure according to claim 1 or 2, characterized in that, The first blocking flow channel (12) comprises a first communication groove (121) and a first blocking block (122), the first communication groove (121) communicates two adjacent casing flow channels (11) at the axial first end of the motor casing (1), the first blocking block (122) closes the first communication groove (121), and the first blocking flow channel (12) and the second end cover flow channel (31) form curved flow channels on both sides of the first serpentine flow channel unit.
4. The electric machine with a cooling structure according to claim 1, characterized by 5. The electric machine with cooling structure according to claim 2, characterized by The first blocking flow channel (12) comprises a first communication groove (121) and a first blocking block (122), the first communication groove (121) communicates two adjacent machine shell flow channels (11) at an axial first end of the motor shell (1), and the first blocking block (122) blocks the first communication groove (121); the first blocking flow channel (12) and the second end cover flow channel (31) form curved flow channels on both sides of a first serpentine flow channel unit; the second blocking flow channel (13) comprises a second communication groove (131) and a second blocking block (132), the second communication groove (131) communicates two adjacent machine shell flow channels (11) at an axial second end of the motor shell (1), and the second blocking block (132) blocks the second communication groove (131); the second blocking flow channel (13) and the first end cover flow channel (21) form curved flow channels on both sides of a second serpentine flow channel unit.
6. The electric machine with a cooling structure according to claim 1 or 2, characterized by Corresponding first sealing rings are arranged between the first end cover flow channel (21) and the motor shell (1), and corresponding second sealing rings are arranged between the second end cover flow channel (31) and the motor shell (1); an inlet sealing ring is arranged between the liquid inlet flow channel (32) and the motor shell (1), and an outlet sealing ring is arranged between the liquid outlet flow channel (33) and the motor shell (1).
7. The electric machine with a cooling structure according to claim 1 or 2, characterized by The plurality of machine shell flow channels (11) are uniformly distributed along the cross-sectional profile of the motor shell (1).
8. The electric machine with cooling structure according to claim 7, characterized in that, The plurality of machine shell flow channels (11) are uniformly distributed in the circumferential direction.
9. The electric machine with a cooling structure according to claim 1 or 2, characterized by, The motor is a water-cooled motor.