An electric machine with a cooling housing

Abstract

The utility model discloses a motor with cooling shell, include: the shell body, its inside sleeve is equipped with inner casing still include: the inner casing is opened with cooling liquid passage, and cooling liquid passage is helical distribution, the shell body is set with liquid inlet and liquid outlet from top to bottom in proper order on, liquid inlet is linked together with cooling liquid passage first end, and liquid outlet is linked together with cooling liquid passage tail end, the flow guide fin has multiple groups, and evenly distributes on cooling liquid passage, the utility model discloses a motor with cooling shell has solved the uneven radial temperature distribution of existing motor, and the problem of insufficient cooling heat dissipation capacity.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor with a cooling housing. Background Technology

[0002] With the advancement of industrial technology, the power density requirements for motors in various devices are constantly increasing. High power density means that the motor must output greater power within a smaller size and weight, which inevitably leads to the generation of more heat inside the motor.

[0003] To address the aforementioned issues, existing technologies typically incorporate coolant channels on motors with cooling housings to dissipate heat and ensure the stability and reliability of the motor during high-power operation. For example, application number CN201720615873.2 describes a motor housing with axially linearly distributed cooling channels. However, this device has drawbacks: the axial distribution of the cooling channels results in a limited heat absorption area, which can lead to uneven radial temperature distribution in the motor and insufficient overall heat dissipation capacity, thereby affecting motor performance and lifespan. Utility Model Content

[0004] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0005] To achieve these objectives and other advantages according to the present invention, a motor with a cooling housing is provided, comprising: an outer casing with an inner casing fitted inside it, and further comprising:

[0006] The inner housing contains a motor stator, and the motor stator is fitted with a motor rotor. The motor rotor is rotatably connected to a motor with a cooling housing. The stator winding of the motor stator is formed by winding a single turn of first rectangular copper wire or multiple turns of first rectangular copper wire.

[0007] The inner shell has coolant channels, which are distributed in a spiral shape.

[0008] The outer casing is provided with a liquid inlet and a liquid outlet from top to bottom. The liquid inlet is connected to the first end of the coolant channel, and the liquid outlet is connected to the last end of the coolant channel.

[0009] The guide fins are in multiple sets and are evenly distributed on the coolant channels.

[0010] Preferably, the motor stator includes:

[0011] The stator core is fixedly installed inside the inner housing, and multiple stator slots are symmetrically opened on the inner wall of the stator core. The stator windings are respectively embedded in each of the stator slots by winding.

[0012] Multiple slot-to-slot insulations are respectively disposed between each of the stator slots and the stator windings;

[0013] The motor rotor includes:

[0014] The rotor core is fitted inside the motor stator. The outer wall of the rotor core has multiple rotor slots symmetrically opened, and multiple magnetic pole inserts are symmetrically fixedly connected to the rotor core.

[0015] The rotor windings are respectively fitted into the rotor slots by winding;

[0016] The rotating shaft has its middle section connected through to the middle position of the rotor core, and its two ends are rotatably connected to the inner housing.

[0017] Preferably, the lowest end of the inner shell is provided with trapezoidal limiting blocks distributed in a circumferential matrix;

[0018] The lowest end of the inner wall of the outer shell is provided with trapezoidal slots distributed in a circumferential matrix, and the trapezoidal slots are engaged with trapezoidal limiting blocks.

[0019] The inner shell and the outer shell are sealed and welded together.

[0020] Preferably, the guide fins are distributed in a curved matrix at equal intervals along the coolant channels, and the interval between adjacent guide fins is 1 / 8 to 1 / 12 of the circumference of the inner shell cross-section.

[0021] Preferably, the specific shape of the guide fin is a square pyramid structure, wherein the front cone angle of the square pyramid structure is laterally attached to the inner surface of the coolant channel, and the height of the front cone angle is lower than the height of the rear end face;

[0022] The width of the guide fin is smaller than the width of the coolant channel, and the guide fin is located on the center line of the coolant channel. The overall height of the guide fin is lower than the height of the coolant channel.

[0023] Preferably, on both sides of the quadrangular pyramid structure, wavy drainage strips are distributed in a circular matrix with the front pyramid corner as the center.

[0024] This utility model has at least the following beneficial effects:

[0025] This device replaces the round copper wires in the stator windings with rectangular copper wires, thereby increasing the full slot ratio of the motor stator and having the beneficial effects of increasing current density, increasing magnetic flux, and increasing motor output power.

[0026] Meanwhile, the spiral distribution of the coolant channels increases the contact area and contact time between the coolant and the motor housing, allowing heat to be transferred to the coolant more fully. At the same time, the spiral path ensures that the coolant is distributed more evenly on the inner housing, avoiding local overheating and ensuring that the temperature of various parts of the motor is relatively balanced, effectively absorbing heat to extend the overall service life of the motor.

[0027] Furthermore, the flow guide fins further enhance the turbulence of the coolant, strengthen convective heat transfer, and effectively reduce the motor temperature.

[0028] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is a front sectional view of the motor of this utility model;

[0031] Figure 3 This is a side sectional view of the motor of this utility model;

[0032] Figure 4 This is a schematic diagram of the overall structure of the shell of this utility model;

[0033] Figure 5 This is a schematic diagram of the overall cross-sectional structure of the shell of this utility model;

[0034] Figure 6 For the present utility model Figure 4 Enlarged schematic diagram of the flow guide fin structure at point A;

[0035] The markings in the diagram are as follows: 1. Outer shell, 11. Liquid inlet, 12. Liquid outlet, 13. Trapezoidal slot, 2. Inner shell, 21. Trapezoidal limiting block, 3. Coolant channel, 4. Guide fins, 41. Front cone angle, 42. Rear end face, 43. Wavy guide strip, 5. Motor with cooling shell, 51. Motor stator, 52. Motor rotor, 521. Rotor core, 522. Rotor slot, 523. Magnetic pole insert, 53. Stator winding, 6. Stator core, 61. Stator slot, 7. Shaft. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0037] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0038] It should be noted that in the description of this utility model, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They 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 of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" 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 a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0040] Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] The following is a detailed description of this novel experimental device with reference to the accompanying drawings:

[0042] Figure 1-6 This invention discloses a motor with a cooling housing, comprising: an outer shell 1, inside which an inner shell 2 is fitted, and further comprising:

[0043] The inner housing 2 is provided with a motor stator 51, and a motor rotor 52 is sleeved inside the motor stator 51. The motor rotor 52 is rotatably connected to the inner housing 2. The stator winding 53 of the motor stator 51 is formed by winding a single turn of first rectangular copper wire or multiple turns of first rectangular copper wire.

[0044] The inner shell 2 has a coolant channel 3, and the coolant channel 3 is distributed in a spiral shape;

[0045] The outer casing 1 is provided with a liquid inlet 11 and a liquid outlet 12 from top to bottom. The liquid inlet 11 is connected to the first end of the coolant channel 3, and the liquid outlet 12 is connected to the last end of the coolant channel 3.

[0046] The guide fins 4 are in multiple sets and are evenly distributed on the coolant channel 3.

[0047] Working principle:

[0048] Working principle of the motor: By setting the stator winding 53 to be composed of a single turn or multiple turns of first rectangular copper wire, the first rectangular copper wire can improve the full slot ratio of the motor stator 51 compared with round copper wire, thereby greatly improving the heat conduction of the stator winding 53 and enabling rapid heat dissipation, thus giving the motor a longer service life. The cross-sectional area of ​​the first rectangular copper wire is much larger than that of round copper wire, which can increase the current density, increase the magnetic flux, and at the same time increase the output power of the motor. In this technical solution, replacing the round copper wire of the stator winding 53 with rectangular copper wire improves the full slot ratio of the motor stator 51, which has the beneficial effects of increasing current density, increasing magnetic flux, and increasing motor output power.

[0049] Working principle of the casing: Coolant flows in from the inlet 11 of the outer casing 1 and enters the spirally distributed coolant channels 3 on the inner casing 2. During the flow, the coolant exchanges heat with the heat generated inside the motor. At the same time, the guide fins 4 break the laminar flow of the coolant, causing it to become turbulent, accelerating the flow speed of the liquid, speeding up the absorption of heat from the engine block by the coolant, improving heat exchange efficiency, assisting in heat dissipation, and finally flowing out from the outlet 12 of the outer casing 1, completing a heat dissipation cycle.

[0050] Among them, the coolant should preferably have high specific heat capacity and good fluidity, low freezing point and high boiling point to adapt to different working environment temperatures, such as ethylene glycol aqueous solution.

[0051] In summary, this device replaces the round copper wires in the stator winding 53 with rectangular copper wires, thereby increasing the full slot ratio of the motor stator and having the beneficial effects of increasing current density, increasing magnetic flux, and increasing motor output power.

[0052] Meanwhile, the spiral distribution of the coolant channels 3 increases the contact area and contact time between the coolant and the motor housing, allowing heat to be transferred to the coolant more fully. At the same time, the spiral path allows the coolant to be distributed more evenly on the inner housing 2, avoiding local overheating and ensuring that the temperature of various parts of the motor is relatively balanced, effectively absorbing heat to extend the overall service life of the motor.

[0053] Furthermore, the turbulence of the coolant is further enhanced by the guide fins 4, which strengthens convective heat transfer and can effectively reduce the motor temperature.

[0054] As described above, the motor stator 51 includes:

[0055] The stator core 6 is fixedly installed inside the inner housing 2, and multiple stator slots 61 are symmetrically opened on the inner wall of the stator core 6. The stator windings 53 are respectively embedded in each of the stator slots 61 by winding.

[0056] Multiple slot insulations are respectively disposed between each of the stator slots 61 and the stator windings 53;

[0057] The motor rotor 52 includes:

[0058] The rotor core 521 is sleeved inside the motor stator 51. The outer wall of the rotor core 521 is symmetrically provided with multiple rotor slots 522, and multiple magnetic pole inserts 523 are symmetrically fixedly connected to the rotor core 521.

[0059] The rotor windings are respectively fitted into the rotor slots 522 by winding;

[0060] The rotating shaft 7 has its middle part connected through to the middle position of the rotor core 521, and its two ends are rotatably connected to the inner housing 2.

[0061] Working principle:

[0062] When winding the stator winding 53, the inter-slot insulation is first placed in each stator slot 61, and then a single-turn or multi-turn first rectangular copper wire is wound in each stator slot 61 to form the stator winding 53, which is then fitted into each stator slot 61. By pre-setting cross-slot series welding of the winding wire ends, the motor phase sequence is formed. The same motor can have multiple phase sequence windings, and different starting connections of the motor are formed by connecting the phase sequence leads in series and parallel. This method has the advantages of ensuring structural stability and insulation effect.

[0063] When the motor is energized: the stator winding 21 generates a magnetic field of fixed polarity. The rotor winding, through its interaction with multiple magnetic pole inserts 523, experiences forces within this magnetic field, causing the rotor core 521 to rotate. This, in turn, drives the shaft 7 to rotate. Because the stator winding 21 is composed of rectangular copper wire, the full slot ratio of the motor stator 51 is increased, thereby improving heat conduction and enabling rapid heat dissipation. This allows the motor rotor 52 to rotate for a longer period. The cross-sectional area of ​​the rectangular copper wire is significantly larger than that of the round copper wire, increasing current density and magnetic flux, thus enhancing the output power of the motor rotor 52. This method offers advantages in ensuring connection stability and output efficiency.

[0064] Among them, ① the number of stator slots 61 is preferably set to 36 slots, which further reduces the number of coils accordingly.

[0065] ②The leads of stator winding 53 are all welded with the same material. The reliability of the stator winding lead connection is ensured by the same material welding method, which has the advantage of ensuring output efficiency.

[0066] ③ All rotor winding leads are welded using the same material. This method of welding ensures the reliability of the rotor winding lead connections, which is advantageous for maintaining output efficiency.

[0067] ④ The stator core 6 is formed by stamping and stacking multiple stator silicon steel sheets, and the rotor core 521 is formed by stamping and stacking multiple rotor silicon steel sheets. The stator core 6, formed by stamping and stacking multiple stator silicon steel sheets, can ensure the conversion efficiency and magnetic flux of the motor stator 51. The rotor core 521, formed by stamping and stacking multiple rotor silicon steel sheets, can ensure the conversion efficiency and magnetic flux of the motor rotor 52.

[0068] ⑤ The rotor winding is constructed by winding a single-turn or multiple-turn second rectangular copper wire. By setting the rotor winding to be constructed by winding a single-turn or multiple-turn second rectangular copper wire, the full slot ratio of the motor rotor 52 is increased, thereby greatly improving the heat conduction of the rotor winding and enabling rapid heat dissipation, resulting in a longer service life for the motor. The cross-sectional area of ​​the second rectangular copper wire is significantly larger than that of the round copper wire, which can increase the current density, increase the magnetic flux, and further improve the output power of the motor.

[0069] In the above scheme, the lowest end of the inner shell 2 is provided with trapezoidal limiting blocks 21 arranged in a circular matrix;

[0070] The lowest end of the inner wall of the outer shell 1 is provided with trapezoidal slots 13 arranged in a circumferential matrix, and the trapezoidal slots 13 are engaged with the trapezoidal limiting block 21.

[0071] The inner shell 2 is sealed and welded to the outer shell 1.

[0072] Working principle:

[0073] During housing assembly, the trapezoidal limiting block 21 of the inner housing 2 is aligned with and inserted into the trapezoidal slot 13 of the outer housing 1, providing reliable positioning and constraint to ensure accurate relative positioning. Subsequently, sealing welding securely connects the inner housing 2 and the outer housing 1 into a single unit, ensuring the sealing of the coolant passage 3, preventing coolant leakage, and achieving normal heat dissipation.

[0074] Meanwhile, in actual production, this device can preferentially adopt the hot fitting process in interference fit:

[0075] First, the axial lengths of the outer shell 1 and the inner shell 2 are made equal. Then, the outer shell 1 is heated to expand, while the inner shell 2 is cooled to contract. The inner shell 2 is then placed into the outer shell 1, so that the trapezoidal limiting block 21 of the inner shell 7 and the trapezoidal slot 13 of the outer shell 1 are interlocked and fitted together. After cooling, the outer shell 1 contracts and the inner shell 2 springs back, thus completing the mutual clamping. For a similar processing method, please refer to the description in application number CN201621368178.2.

[0076] To further enhance the sealing effect, sealant can be used to fill the gaps at both ends (or welded) as needed.

[0077] The outer end face of the inner shell 2 and the inner end face of the outer shell 1 can be sealed and fixed to each other by friction welding; or an interference fit can be used for initial fixation, and then sealant can be used to fill the gap; or compatible sealant can be applied to the outer end face of the inner shell 2 and the inner end face of the outer shell 1, the inner shell 2 can be installed into the outer shell 1, the position can be adjusted and fixed, and appropriate pressure can be applied to make the sealant fully fill the gap.

[0078] Among them, ① the way the trapezoidal slot 13 engages with the trapezoidal limiting block 21 is easier to assemble than simple planar contact, and can withstand greater external forces and vibrations, thus enhancing the stability of the connection between the inner shell 2 and the outer shell 1.

[0079] ② In actual production, the materials of the inner shell 2 and the outer shell 1 must have good mechanical strength to withstand the internal coolant pressure and external mechanical force. Metal materials such as aluminum alloy (aluminum alloy is lightweight and has good thermal conductivity so that the heat of the motor can be quickly transferred to the coolant), cast iron (cast iron has high strength and low cost), stainless steel (stainless steel has strong corrosion resistance and is suitable for harsh environments) can be selected.

[0080] Simultaneously, appropriate welding materials need to be selected based on the materials of the inner shell 2 and the outer shell 1. For example, when welding aluminum alloy, appropriate aluminum alloy welding wire can be selected; when welding stainless steel, matching stainless steel welding rods or wires should be selected. The welding materials must ensure good compatibility with the base material and achieve the required strength and sealing performance after welding.

[0081] In the above scheme, the guide fins 4 are distributed in a curved matrix at equal intervals along the coolant channel 3, and the interval between adjacent guide fins 4 is 1 / 8 to 1 / 12 of the circumference of the inner shell 2 cross-section.

[0082] Working principle:

[0083] When the coolant flows in the coolant channel 3, the curved guide fins 4 change the flow path and speed of the coolant, causing the coolant to generate disturbance and turbulence. This breaks the relatively static boundary layer between the coolant and the channel wall, increases the contact frequency and area between the coolant and the inner wall of the coolant channel 3 and the surface of the fins, resulting in more uniform heat exchange. This effectively avoids local overheating or overcooling and ensures that the temperature of all parts of the motor is balanced.

[0084] Among them, ① in actual production, the material of the guide fin 4 must have good thermal conductivity and be able to transfer heat quickly; it also needs to have a certain strength and erosion resistance to withstand the impact of the coolant. Aluminum alloy, stainless steel, etc. can be selected.

[0085] ② Processing methods can be selected during production, such as:

[0086] (1) Welding and fixing: Accurately place the guide fins 4 in the predetermined position of the coolant channel 3 and fix them with a clamp to ensure that the position is stable during the welding process. Then select a suitable welding process, such as argon arc welding (suitable for aluminum alloys, stainless steel, etc.) or gas welding (commonly used for copper alloys). Operate according to the welding process parameters (such as welding current, voltage, welding speed, etc.) to ensure that the weld is uniform, firm, and free from defects such as porosity and slag inclusions.

[0087] (2) Embedding and fixing: According to the size and shape of the guide fin 4, use machining equipment (such as CNC milling machine, lathe, etc.) to precisely machine grooves on the inner wall of the coolant channel 3, embed the guide fin 4 into the grooves, and apply appropriate pressure with a press or other tools to make the guide fin 4 fit tightly with the grooves. If necessary, sealant or adhesive can be filled between the grooves and the guide fin 4 to further fix and ensure sealing.

[0088] ③ The appropriate spacing can be selected according to the circumference of the inner shell 2 cross-section. If the spacing is too large, the coolant flow will easily remain in a laminar state, the boundary layer will be thick, and the heat dissipation efficiency will decrease. If the spacing is too small, the guide fins 4 will be too dense, the space will be narrow and the heat exchange will not be smooth, thus reducing the heat exchange efficiency.

[0089] For example, an interval of 1 / 8 to 1 / 12 can create moderate turbulence when the coolant flows through the fins, ensuring that each fin surface can fully contact the coolant.

[0090] As described above, the specific shape of the guide fin 4 is a quadrangular pyramid structure, wherein the front cone angle 41 of the quadrangular pyramid structure is laterally attached to the inner surface of the coolant channel 3, and the height of the front cone angle 41 is lower than the height of the rear end face 42.

[0091] The width of the guide fin 4 is smaller than the width of the coolant channel 3, and the guide fin 4 is located on the center line of the coolant channel 3. The overall height of the guide fin 4 is lower than the height of the coolant channel 3.

[0092] Working principle:

[0093] The rear end face 42 of the guide fin 4, which is higher, first contacts the cooling liquid, guiding the liquid smoothly into the guide fin 4 region. As it transitions to a lower front cone angle 41, the flow channel gradually widens, which can increase the liquid flow rate. Specifically:

[0094] The coolant first impacts the rear end face 42 of the fin. Due to the sudden expansion of the cross section (the width of the rear end face 42 of the guide fin 4 is greater than the front cone angle 41), the fluid kinetic energy is converted into pressure energy, forming a high-pressure impact zone. The high-pressure impact forces the coolant to diffuse to both sides and the front end of the fin, forming a strong shear flow on the rear end face 42, which directly scours the channel wall and effectively destroys the thermal boundary layer near the rear end face 42.

[0095] After the fluid bypasses the rear end face 42, the flow velocity increases and boundary layer separation occurs due to the contraction of the channel cross section. The height difference between the rear end face 42 (high pressure) and the front cone angle 41 (low pressure) forms a pressure gradient from the outer wall to the center line in the radial direction of the channel, driving the coolant to flow towards the center area of ​​the channel. This guides the diffused fluid to converge back to the central axis near the front end face, ensuring that the main flow of coolant is along the central axis of the channel, thus avoiding local overheating or undercooling.

[0096] In summary, the design of the rear-high, front-low quadrangular pyramidal guide fins 4 ultimately breaks the laminar flow of the coolant, promoting turbulence. Turbulence increases the mixing degree of liquid molecules, allowing the liquid to fully contact the fin surface and accelerating the absorption of heat from the motor by the coolant.

[0097] As described above, on both sides of the quadrangular pyramid structure, there are wave-shaped drainage strips 43 distributed in a circular matrix with the front cone angle 41 as the center.

[0098] Working principle:

[0099] The undulating surface of the corrugated guide strip 43 causes disturbance to the flow direction of the coolant: when the coolant flows in the coolant channel 3, it encounters the transverse corrugated guide strips 43 on both sides of the square pyramid structure, and the originally relatively straight flow path is changed. The corrugated undulations cause the coolant to constantly change its flow direction, increasing the degree of fluid turbulence and promoting its transformation from laminar flow to turbulent flow.

[0100] At this point, because turbulence can more effectively disrupt the boundary layer between the fluid and the wall, the coolant can make more full contact with the wall and carry away heat.

[0101] Among them, with the front cone angle 41 as the center, the wavy guide strips 43 are distributed in a circular matrix to guide the coolant, so that the coolant can contact the four-corner cone structure and the channel wall of the coolant channel 3 more evenly, thereby improving the heat dissipation uniformity.

[0102] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A motor with a cooling housing, comprising: The outer shell, which is fitted with an inner shell, is characterized in that it further includes: The inner housing contains a motor stator, and the motor stator is fitted with a motor rotor. The motor rotor is rotatably connected to a motor with a cooling housing. The stator winding of the motor stator is formed by winding a single turn of first rectangular copper wire or multiple turns of first rectangular copper wire. The inner shell has coolant channels, which are distributed in a spiral shape. The outer casing is provided with a liquid inlet and a liquid outlet from top to bottom. The liquid inlet is connected to the first end of the coolant channel, and the liquid outlet is connected to the last end of the coolant channel. The guide fins are in multiple sets and are evenly distributed on the coolant channels.

2. The motor with a cooling housing according to claim 1, characterized in that, The motor stator includes: The stator core is fixedly installed inside the inner housing, and multiple stator slots are symmetrically opened on the inner wall of the stator core. The stator windings are respectively embedded in each of the stator slots by winding. Multiple slot-to-slot insulations are respectively disposed between each of the stator slots and the stator windings; The motor rotor includes: The rotor core is fitted inside the motor stator. The outer wall of the rotor core has multiple rotor slots symmetrically opened, and multiple magnetic pole inserts are symmetrically fixedly connected to the rotor core. The rotor windings are respectively fitted into the rotor slots by winding; The rotating shaft has its middle section connected through to the middle position of the rotor core, and its two ends are rotatably connected to the inner housing.

3. The motor with a cooling housing according to claim 1, characterized in that, The lowest end of the inner shell is provided with trapezoidal limiting blocks distributed in a circular matrix; The lowest end of the inner wall of the outer shell is provided with trapezoidal slots distributed in a circumferential matrix, and the trapezoidal slots are engaged with trapezoidal limiting blocks. The inner shell and the outer shell are sealed and welded together.

4. The motor with a cooling housing according to claim 1, characterized in that, The guide fins are distributed in a curved matrix at equal intervals along the coolant channels, and the interval between adjacent guide fins is 1 / 8 to 1 / 12 of the circumference of the inner shell cross-section.

5. The motor with a cooling housing according to claim 1, characterized in that, The specific shape of the guide fin is: a four-cornered pyramid structure, wherein the front cone angle of the four-cornered pyramid structure is laterally attached to the inner surface of the coolant channel, and the height of the front cone angle is lower than the height of the rear end face; The width of the guide fin is smaller than the width of the coolant channel, and the guide fin is located on the center line of the coolant channel. The overall height of the guide fin is lower than the height of the coolant channel.

6. The motor with a cooling housing according to claim 5, characterized in that, On both sides of the quadrangular pyramid structure, wavy drainage strips are distributed in a circular matrix with the front pyramid angle as the center.

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