An electric machine

Abstract

The application discloses a motor, which comprises a shell and a rotor assembly. A second cavity and a second channel are formed in the shell. The second channel is used for guiding cooling liquid into the second cavity. The rotor assembly is installed in the second cavity. The mist-shaped fluid formed under the agitation of the cooling liquid guided from the second channel can cool the rotor assembly. In the application, a small amount of cooling liquid is guided into the second cavity through the second channel. The cooling liquid is scattered and agitated to form mist-shaped cooling medium by the rotation of the rotor assembly. The cooling efficiency is high, the mechanical loss is small, and the complicated atomizing device or specially designed flow channel structure is not needed. Therefore, the motor structure is simple and compact, and the production cost of the motor is reduced.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a motor with a cooling structure. Background Technology

[0002] Currently, the cooling method for motors usually involves constructing a cooling channel in the casing or a separate component to cool the stator assembly. The coolant circulating in the channel carries away the heat generated by the stator assembly during operation.

[0003] Current motor cooling methods primarily target the stator assembly, while rotor assembly cooling is typically neglected or only indirectly cooled. This is mainly because direct contact between the coolant and the rotor assembly would result in excessive resistance, hindering rotor rotation and negatively impacting motor power. Considering the rotor assembly's operating characteristics, atomized fluids such as oil mist can be used for cooling. This requires a separate atomizing device and a specially designed convection cooling channel to generate the atomized fluid that can directly contact the rotor assembly. However, this approach usually leads to a complex internal motor structure, increased manufacturing difficulty, and an unnecessary increase in overall motor size. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the main objective of the present invention is to provide a motor that can use mist fluid to dissipate heat from the rotor assembly and has a simple and compact structure.

[0005] To achieve the above objectives, the present invention provides a motor comprising:

[0006] A housing, wherein a second chamber and a second channel are formed within the housing, the second channel being used to introduce coolant into the second chamber; and...

[0007] The rotor assembly is rotatably mounted in the second chamber;

[0008] The second channel is configured such that the coolant flowing into the second chamber forms a mist-like fluid under the agitation of the rotor assembly.

[0009] Optionally, the motor further includes a stator assembly and a cooling device. A first chamber and a first channel are formed inside the housing. The stator assembly is installed in the first chamber. The first channel connects the outlet of the cooling device and the first chamber. A first outlet connecting the first chamber and a second outlet connecting the second chamber are also formed inside the housing. Both the first outlet and the second outlet are connected to the inlet of the cooling device.

[0010] Optionally, the motor further includes a separator disposed between the first chamber and the second chamber to define a second channel forming a communication between the first chamber and the second chamber, the second channel being used to partially introduce coolant from the first chamber into the second chamber.

[0011] Optionally, the second chamber has an annular region surrounding the outer periphery of the rotor assembly, one end of the second channel forms a liquid inlet facing the second chamber, and the separator is configured such that the axial projection of the liquid inlet at least partially coincides with the annular region.

[0012] Optionally, the liquid inlet is arranged in a ring shape extending circumferentially; or,

[0013] The liquid inlet is provided in multiple ways, and the multiple liquid inlets are distributed at intervals in the circumferential direction.

[0014] Optionally, the stator assembly and the rotor assembly are arranged side by side in the axial direction, and the separator is a partition plate installed on the stator assembly;

[0015] A first gap is defined between the outer periphery of the partition and the inner wall of the housing, the first gap forming at least a portion of the second channel; and / or,

[0016] The housing also includes a bearing chamber, in which a bearing is installed. The rotor assembly is rotatably supported by the bearing. A partition is arranged around the outer periphery of the bearing chamber, and a second gap is defined between the inner periphery of the partition and the first peripheral wall of the bearing chamber. The second gap constitutes at least a portion of the second channel.

[0017] Optionally, the stator assembly includes multiple segmented iron cores, and the partition plate has multiple mounting holes, with each segmented iron core being inserted into one of the mounting holes.

[0018] Optionally, one end of the second channel forms a liquid inlet facing the second chamber, the liquid inlet being elongated and having a width dimension of less than or equal to 0.5 mm.

[0019] Optionally, the upper end of the housing has an inlet, the lower end of the housing has a liquid collection chamber, the motor also includes a circulation pipe connecting the inlet and the liquid collection chamber, the cooling device is disposed on the circulation pipe, the inlet is connected to the first channel, the first outlet is disposed at the bottom of the first chamber, the second outlet is disposed at the bottom of the second chamber, and the first outlet and the second outlet are respectively connected to the liquid collection chamber.

[0020] Optionally, there are two first chambers, which are axially located on both sides of the second chamber. There are two stator assemblies, with one stator assembly installed in each of the first chambers.

[0021] The technical solution provided by this invention has the following beneficial effects:

[0022] The motor provided by this invention includes a housing and a rotor assembly. A second chamber and a second channel are formed within the housing. The second channel is used to introduce coolant into the second chamber. The rotor assembly is installed in the second chamber. The coolant introduced through the second channel forms a mist-like fluid under the agitation of the rotor assembly, thus cooling the rotor assembly. Specifically, the mist-like fluid forms fine droplets within the second chamber, covering the surface of the rotor assembly, increasing the heat dissipation contact area and improving cooling efficiency. Furthermore, due to the high fluidity of the mist-like medium, it significantly reduces rotor rotation resistance and avoids increased mechanical losses caused by direct contact between the liquid coolant and the rotor. In the embodiments provided by this invention, by controlling the second channel to deliver a small amount of coolant into the second chamber, and utilizing the rotation of the rotor assembly itself during operation to disperse and agitate the coolant to form a mist-like cooling medium, there is no need for a complex atomizing device or a specially designed flow channel structure, making the motor structure simpler and more compact, and reducing the production cost of the motor. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the motor provided by the present invention;

[0025] Figure 2 for Figure 1 A front view of the stator assembly and housing on the left side of the motor.

[0026] Figure 3 for Figure 1 A front view of the assembly of the spray plate and spray block on the left side of the motor with the machine housing;

[0027] Figure 4 for Figure 3 A three-dimensional structural diagram of the middle casing;

[0028] Figure 5 for Figure 3 A three-dimensional structural diagram of the central housing, spray plate, and spray blocks;

[0029] Figure 6 for Figure 1 A front view of the stator assembly and housing on the right side of the motor.

[0030] Figure 7 for Figure 1 A front view of the assembly of the spray plate and spray block on the right side of the motor with the machine housing;

[0031] Figure 8 for Figure 7 A three-dimensional structural diagram of the middle casing;

[0032] Figure 9 for Figure 7 A three-dimensional structural diagram of the central housing, spray plate, and spray blocks;

[0033] Figure 10 for Figure 2 or Figure 6 Front view of the central partition;

[0034] Figure 11 for Figure 5 or Figure 9 A three-dimensional structural diagram of the central spray plate;

[0035] Figure 12 for Figure 5 or Figure 9 A three-dimensional structural diagram of the central spray block;

[0036] Figure 13 for Figure 12 A three-dimensional structural diagram of the central spray block from another perspective.

[0037] Explanation of icon numbers:

[0038] 100-Motor; 10-Housing; 11-First chamber; 111-First outlet; 12-Second chamber; 120-Annular region; 121-Second outlet; 13-First channel; 131-Outer ring flow path; 132-Inner ring flow path; 133-First arc-shaped wall; 134-Second arc-shaped wall; 14-Second channel; 140-Liquid inlet; 141-First gap; 142-Second gap; 15-Inlet; 16-Liquid collection chamber; 17-Second peripheral wall; 18-Second bottom wall; 20-Stator assembly; 21- Segmented iron core; 30-Rotor assembly; 40-Separator; 41-Baffle; 411-Mounting hole; 50-Bearing chamber; 51-Bearing; 52-First bottom wall; 521-Spray hole; 53-First peripheral wall; 531-Pass through; 60-Circulation pipeline; 61-Pump body; 62-Cooling device; 63-First pipeline; 64-Second pipeline; 65-Third pipeline; 70-Arc-shaped groove; 71-Spray plate; 711-First nozzle; 80-Annular groove; 81-Spray block; 811-Second nozzle; 82-Combining groove.

[0039] The realization of the objective of this invention, its functional characteristics and excellent effects will be further explained below in conjunction with specific embodiments and accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] This invention provides a motor 100. Please refer to [link / reference]. Figure 1The motor 100 provided by this invention includes a housing 10, a stator assembly 20, and a rotor assembly 30. Both the stator assembly 20 and the rotor assembly 30 are mounted on the housing 10. Preferably, the housing 10 has a closed structure, with the stator assembly 20 and rotor assembly 30 installed within it. Rapid heat dissipation is achieved through a circulating coolant, reducing the adverse effects of high temperatures on the performance of the motor 100. Various coolants can be selected. In this embodiment, the coolant is a downward-flowing coolant under gravity, preferably a hydrocarbon coolant with good fluidity, which is low in cost and environmentally friendly. In other embodiments, deionized water can also be used as the coolant, as it has high specific heat capacity and good fluidity, enabling efficient heat absorption. In special environments with strict fire and explosion protection requirements, fluorocarbon non-flammable coolants with better stability can be selected. The housing 10 is preferably made of a material with sufficient structural strength, good heat dissipation, and ease of molding, such as engineering plastics.

[0044] The housing 10 has a first chamber 11 and a second chamber 12. The stator assembly 20 is installed in the first chamber 11, and the rotor assembly 30 is rotatably installed in the second chamber 12. A second channel 14 for introducing coolant into the second chamber 12 is also formed in the housing 10. The second channel 14 is configured such that the coolant flowing into the second chamber 12 forms a mist-like fluid under the agitation of the rotor assembly 30. It should be noted that the flow rate of the coolant entering the second chamber 12 is controlled by the second channel 14, ensuring that the flow rate is sufficiently small. After entering the second chamber 12, the rotating rotor assembly 30 quickly disperses and agitates the coolant, forming a mist-like fluid. Simultaneously, the coolant flow rate is sufficient to create a mist-like fluid that effectively dissipates heat from the rotor assembly 30. Specifically, the mist-like fluid forms fine droplets within the second chamber 12, covering the surface of the rotor assembly 30, increasing the heat dissipation contact area, improving cooling efficiency, and significantly reducing the rotational resistance of the rotor assembly 30 due to the high fluidity of the mist, thus avoiding increased mechanical losses caused by direct contact between the liquid coolant and the rotor assembly 30.

[0045] In the embodiments provided by the present invention, a small amount of coolant is delivered to the second chamber 12 by controlling the second channel 14, and the coolant is dispersed and stirred by the rotation of the rotor assembly 30 during operation to form a mist-like cooling medium. There is no need to set up a complex atomizing device or a specially designed flow channel structure, which makes the structure of the motor 100 simpler and more compact, and reduces the production cost of the motor 100.

[0046] The design of the second channel 14 can be varied. For example, a flow valve or proportional valve can be installed on the second channel 14 to control the amount of coolant entering the second chamber 12 through the second channel 14. Alternatively, the orientation and amount of coolant entering the second chamber 12 can be controlled by adjusting the size, shape, and area of ​​the inlet 140 of the second channel 14. Optionally, one end of the second channel 14 forms an inlet 140 facing the second chamber 12. The inlet 140 is elongated, and its width is less than or equal to 0.5 mm. This elongated and narrow inlet 140 restricts the flow rate and velocity of the coolant flowing into the second chamber 12. The smaller width allows the coolant to form a thin and uniform liquid film upon entering the second chamber 12, which is more easily broken into a fine and uniform mist under the agitation of the rotor assembly 30, ensuring the stability of the cooling effect of the mist coolant. To prevent the coolant entering the second chamber 12 from remaining in a liquid state, which would cause excessive rotational resistance of the rotor assembly 30.

[0047] Furthermore, the motor 100 also includes a cooling device 62 for supplying coolant, which can be disposed outside the housing 10 or integrated inside the housing 10. A first channel 13 is also formed inside the housing 10 for introducing coolant into the first chamber 11. Specifically, the first channel 13 connects the outlet end of the cooling device 62 and the first chamber 11. The housing 10 also has a first outlet 111 connecting to the first chamber 11 and a second outlet 121 connecting to the second chamber 12. Both the first outlet 111 and the second outlet 121 are connected to the inlet end of the cooling device 62.

[0048] In this embodiment, the cooling medium achieves circulating heat dissipation in the following manner: Most of the coolant flowing out from the outlet of the cooling device 62 flows into the first chamber 11 through the first channel 13. The coolant flows in a liquid state within the first chamber 11, preferably flowing downwards under gravity to carry away heat, and then flows out of the first chamber 11 through the first outlet 111. A small portion of the coolant flowing out from the outlet of the cooling device 62 flows into the second chamber through the second channel 14. The design of the second channel 14 allows the coolant to form a uniform and fine mist-like fluid after entering the second chamber 12, under the agitation of the rotor assembly 30. This mist flows under negative pressure, preferably under the combined action of gravity and negative pressure, and then flows out of the second chamber 12 through the second outlet 121, re-condensing into a liquid state. The coolant flowing from the first outlet 111 and the second outlet 121 merges and flows together towards the inlet of the cooling device 62, achieving circulation.

[0049] In this embodiment, in the first chamber 11, the coolant is in direct contact with the stator assembly 20. Utilizing the excellent thermal conductivity of the liquid, it quickly removes the heat generated by the stator assembly 20, ensuring stable operation of the stator assembly 20 at lower temperatures and reducing the risk of faults such as insulation aging and short circuits caused by high temperatures. In the second chamber 12, the coolant is agitated into a mist by the rotor assembly 30. The small droplets of the mist fluid can comprehensively cover the surface of the rotor assembly, greatly increasing the heat dissipation contact area. Simultaneously, the strong fluidity of the mist medium, compared to a liquid medium, minimizes resistance to rotor rotation, avoiding the additional mechanical losses caused by liquid resistance during rotor rotation in traditional liquid cooling methods, reducing energy waste, and improving motor efficiency.

[0050] In this embodiment, the flow rate of coolant flowing into the first chamber 11 and the second chamber 12 can be adjusted by setting the size of the first channel 13 and the second channel 14, respectively. Generally, the flow rate of the first channel 13 is significantly greater than that of the second channel 14. The size of the second channel 14 should be set so that a small amount of coolant can enter the second chamber 12 and quickly form a mist fluid under the agitation of the rotor assembly 30, so as to avoid excessive coolant volume, which would cause excessive rotational resistance of the rotor assembly 30.

[0051] In an optional embodiment, the first channel 13 and the second channel 14 are respectively connected to the cooling device 62, thereby introducing coolant. In a preferred embodiment, the first channel 13 is directly connected to the inlet end of the cooling device 62, and the second channel 14 is connected to the first chamber 11 and the second chamber 12, so as to introduce coolant from the first chamber 11 to the second chamber 12. This method is more suitable for the actual situation that the stator assembly 20 generates more heat and the rotor assembly 30 generates relatively less heat during the operation of the motor 100, which can effectively shorten the coolant flow path, improve cooling uniformity, and improve cooling efficiency.

[0052] In this embodiment, an open coolant flow channel design is used to address the different heat dissipation needs of the stator assembly 20 and rotor assembly 30. Liquid and mist coolants are applied directly to the heat-generating components to remove heat, thus improving the uneven heat dissipation between the stator and rotor in traditional technologies. This ensures efficient cooling of both the stator assembly 20 and rotor assembly 30 while reducing the rotational resistance of the rotor assembly 30. This design, using different coolant forms for different components, achieves balanced heat dissipation for different heat-generating components, thereby improving the overall heat dissipation efficiency of the motor 100, ensuring stable operation of the motor 100, and reducing operating energy consumption. The motor 100 has a compact structure and does not require a separate second channel 14 independent of the first chamber 11 and the second chamber 12, reducing the increase in the axial dimension of the motor 100.

[0053] Preferably, please refer to the following: Figure 1 , Figure 2 and Figure 6 The motor 100 also includes a separator 40 disposed between the first chamber 11 and the second chamber 12 for defining a second channel 14 that connects the first chamber 11 and the second chamber 12, the second channel 14 for partially introducing coolant from the first chamber 11 into the second chamber 12.

[0054] The separator 40 can be made of a relatively thin material and structure, as long as it can block the flow of coolant. Preferably, a fine guide channel structure is provided on the surface of the separator 40. This guide channel can guide the flow direction of the coolant, allowing it to enter the second chamber 12 more evenly. For example, when the separator 40 is set as a partition 41 between the stator assembly 20 and the rotor assembly 30, multiple guide channels are arranged radially, extending radially from the center of the partition 41 to the outer periphery, and extending axially towards the rotor assembly 30 at the edge of the partition 41, so as to evenly guide the coolant to the rotor assembly 30.

[0055] In this embodiment, the separator 40 separates the two chambers and allows coolant flow through the second channel 14. A small amount of coolant flowing from the first chamber 11 into the second chamber 12 forms a mist for heat dissipation under the agitation of the rotor assembly 30. The design of the separator 40 allows for precise control of the coolant flow direction and the flow rate into the second chamber 12, better matching the heat dissipation requirements of the rotor assembly 30 and preventing excessive rotor rotation resistance due to too much coolant or insufficient heat dissipation due to too little coolant. Furthermore, considering the actual situation that the stator assembly 20 generates more heat and the rotor assembly 30 generates relatively less heat during the operation of the motor 100, the coolant flow path is effectively shortened, further optimizing the internal cooling system of the motor 100, improving overall cooling balance and efficiency, and ensuring the efficient and stable operation of the motor 100.

[0056] Optionally, the second chamber 12 has an annular region 120 surrounding the rotor assembly 30. One end of the second channel 14 forms a liquid inlet 140 facing the second chamber 12. The partition 40 is configured such that the projection of the liquid inlet in the axial direction of 120 at least partially coincides with the annular region 120. In this embodiment, the liquid inlet 140 can be directly an opening provided on the partition 40, or it can be formed by the gap between the partition 40 and the inner wall of the housing 10. It can be understood that the outer periphery of the rotor assembly 30 has the highest linear velocity and the greatest rotational power. The liquid inlet 140 is at least partially facing the outer periphery of the rotor assembly 30, so that the coolant flowing from the second channel 14 to the rotor assembly 30 can be quickly dispersed and agitated in the annular region 120, quickly forming a mist-like fluid.

[0057] Preferably, the inlet 140 is arranged in a ring extending circumferentially, or multiple inlets 140 are provided, with the multiple inlets 140 spaced apart circumferentially. This allows the coolant introduced into the second chamber 12 from the second channel 14 to be more evenly dispersed into all parts of the annular region 120, making it easier to be agitated to form a mist-like fluid, and less likely to accumulate and remain in a liquid state.

[0058] In a preferred embodiment, the motor 100 is an axial magnetic field motor 100, with its stator assembly 20 and rotor assembly 30 arranged side-by-side in the axial direction. Specifically, the motor 100 can be a single-stator single-rotor motor 100, a single-stator dual-rotor motor 100, or a single-rotor dual-stator motor 100. The first chamber 11 and the second chamber 12 in the motor 100 can be arranged accordingly. For example, the first chamber 11 and the second chamber 12 can be arranged side-by-side in the axial direction, with the two first chambers 11 distributed on both sides of the second chamber 12 in the axial direction, or the two second chambers 12 can be distributed on both sides of the first chamber 11 in the axial direction, etc. Correspondingly, the structures such as the first channel 13, the second channel 14, the separator 40, and the housing 10 can be adaptively designed with reference to the descriptions in the various embodiments of this invention, and will not be repeated here.

[0059] Preferred, such as Figures 1 to 9 As shown, the motor 100 provided in this embodiment is a single-rotor dual-stator motor 100. Two first chambers 11 are provided within the housing 10, axially positioned on either side of the second chamber 12. Two stator assemblies 20 are provided, with one stator assembly 20 installed in each of the first chambers 11. The two stator assemblies 20 are symmetrically distributed on both sides of the rotor assembly 30. The two first chambers 11 can share a single coolant circulation path and be cooled by a common external cooling device 62, resulting in a simple structure and low cost. Alternatively, independent coolant circulation paths can be designed for the two first chambers 11, with each branch equipped with an independent flow regulation device and temperature monitoring device. This allows for precise control of the coolant flow distribution ratio based on the actual heat generation of the stator assemblies 20 on both sides, achieving more precise heat dissipation control.

[0060] Preferably, the separator 40 is a partition 41 mounted on the stator assembly 20. A gap exists between the partition 41 and the housing 10, wherein a first gap 141 between the outer periphery of the partition 41 and the inner wall of the housing 10 constitutes at least a portion of the second channel 14. Optionally, the housing 10 is provided with a bearing chamber 50, in which a bearing 51 is installed, and the rotor assembly 30 is rotatably supported by the bearing 51. The partition 41 is circumferentially disposed around the outer periphery of the bearing chamber 50, and a second gap 142 between the inner periphery of the partition 41 and the first peripheral wall 53 of the bearing chamber 50 also constitutes at least a portion of the second channel 14.

[0061] In this embodiment, the stator assembly 20 supports the partition 41, thus eliminating the need for the partition 41 to be supported by the housing 10 or the bearing chamber 50. This allows the partition 41 to define a second channel 14 between itself and the peripheral wall of the housing 10 and / or the bearing chamber 50. The first gap 141 guides the coolant to the outer periphery of the rotor assembly 30, and the second gap 142 guides the coolant to the inner periphery of the rotor assembly 30, forming a mist-like heat dissipation under the agitation of the rotor assembly 30. This design, utilizing gaps to form coolant channels, cleverly integrates the internal structure of the motor 100. Compared to laying additional complex pipelines, this design simplifies the internal structure of the motor 100, reduces the number of parts, lowers production costs and failure risks, and makes the motor 100 more compact with a smaller axial dimension, enabling a wider range of applications. Simultaneously, the design of the first gap 141 and the second gap 142 allows the coolant to flow naturally from the first chamber 11 to the second chamber 12 without the need for complex pumping or guiding structures, ensuring proper coolant flow and improving cooling efficiency.

[0062] The preferred stator assembly 20 includes multiple segmented iron cores 21, and the partition plate 41 has multiple mounting holes 411, in which the multiple segmented iron cores 21 are inserted one-to-one into these mounting holes 411. In this embodiment, the insertion structure between the partition plate 41 and the iron cores is easy to install, and also allows the partition 40 to avoid occupying the axial space inside the motor 100, resulting in a more compact structure. Furthermore, it avoids the partition 40 obstructing the iron cores, occupying the air gap, and adversely affecting the performance of the motor 100.

[0063] Based on the above embodiments, please continue to refer to Figure 1 and Figure 2 The housing 10 has an inlet 15 at its upper end and a liquid collection chamber 16 at its lower end. The motor 100 also includes a circulation pipe 60 connecting the inlet 15 and the liquid collection chamber 16. The inlet 15 is connected to the first channel 13, and the bottoms of the first chamber 11 and the second chamber 12 are both connected to the liquid collection chamber 16. In this embodiment, the circulation pipe 60 can be located inside the housing 10, preferably integrally formed by the housing 10, or it can be located outside the housing 10. A cooling device 62 is provided on the circulation pipe 60 so that the coolant is cooled as it flows through the circulation pipe 60. Preferably, the motor 100 also includes a pump body 61, and both the pump body 61 and the cooling device 62 are provided on the circulation pipe 60. The pump body 61 can be of different types, such as a centrifugal pump, a gear pump, or a plunger pump, and the appropriate pump type is selected according to the flow rate and pressure of the coolant required by the motor 100.

[0064] In this embodiment, the coolant flowing from the outlet of the cooling device 62 enters the first channel 13 through the inlet 15 and flows into the first chamber 11 to cool the stator assembly 20. A portion of the coolant flows from the first chamber 11 to the second chamber 12 through the second channel 14, forming a mist-like fluid under the agitation of the rotor assembly 30, thus cooling the rotor assembly 30. The coolant in the first chamber 11 and the second chamber 12, under the influence of gravity, flows into the collection chamber 16 from the lower first outlet 111 and the second outlet 121, respectively. It is then pumped by the pump body 61 through the circulation pipeline 60 to the inlet of the cooling device 62, forming a circulation. In this embodiment, gravity guides the fluid to flow in an open flow path within the housing 10, passing through the stator assembly 20 and the rotor assembly 30, eliminating the need for complex flow guiding structures and pumping mechanisms. This circulation design enables continuous recycling of the coolant, reducing coolant consumption costs. The continuously supplied coolant can stably absorb the heat generated by the motor 100, keeping the components of the motor 100 within a suitable operating temperature range, avoiding performance degradation and failure caused by excessive temperature, effectively maintaining the stable heat dissipation effect of the motor 100, and improving the operational reliability and service life of the motor 100.

[0065] Based on the above embodiments, please continue to refer to Figure 1 The first channel 13 includes an outer ring flow path 131 disposed on the outer ring of the stator assembly 20 and an inner ring flow path 132 disposed on the inner ring of the stator assembly 20. The housing 10 is provided with a first pipe 63 connecting the inlet 15 and the outer ring flow path 131, and a second pipe 64 connecting the first pipe 63 and the inner ring flow path 132. In this embodiment, the second pipe 64 serves as a branch of the first pipe 63, and the proportion of coolant flowing to the outer ring flow path 131 and the inner ring flow path 132 can be adjusted by setting the diameters of the first pipe 63 and the second pipe 64.

[0066] In this way, the coolant enters the outer ring flow path 131 through inlet 15 and the first pipe 63, and then flows into the inner ring flow path 132 through the second pipe 64, cooling the stator assembly 20 from both the inner and outer directions. This simultaneous cooling of the inner and outer rings achieves comprehensive and more efficient cooling of the stator assembly 20. Compared with a single cooling method, it can remove the heat generated by the stator assembly 20 more quickly, has better cooling uniformity, ensures that the stator assembly 20 maintains good performance during operation, improves the overall performance and stability of the motor 100, and extends the service life of the motor 100.

[0067] Furthermore, a bearing chamber 50 is provided inside the housing 10, and a bearing 51 is installed inside the bearing chamber 50. The rotor assembly 30 is rotatably supported on the bearing 51. A third pipe 65 connecting the second pipe 64 and the bearing chamber 50 is also provided inside the housing 10. In this embodiment, the third pipe 65 serves as a branch of the second pipe 64, and the flow rate of coolant to the bearing chamber 50 can be adjusted by setting the diameters of the third pipe 65 and the second pipe 64. Preferably, a filter screen is provided at the connection between the third pipe 65 and the bearing chamber 50 to filter impurities in the coolant, prevent impurities from entering the bearing chamber 50, and avoid impurities causing wear on the rolling elements and raceways of the bearing 51, thus affecting the normal operation of the bearing 51.

[0068] In this embodiment, a portion of the coolant enters the bearing chamber 50 through the third pipe 65 to cool and lubricate the bearing 51. Good heat dissipation effectively reduces the operating temperature of the bearing 51, preventing problems such as lubrication failure and accelerated wear due to overheating. It is understood that the bearing 51 in this embodiment should be a non-self-lubricating bearing. A stable low-temperature environment helps maintain the normal clearance and lubrication state of the bearing 51, reducing frictional resistance and improving its service life. As a key component supporting the rotation of the rotor assembly 30, the stable performance of the bearing 51 directly affects the overall operational reliability of the motor 100; therefore, effective cooling of the bearing 51 can improve the overall reliability and stability of the motor 100.

[0069] Optionally, please refer to the following: Figure 1 , Figure 4 , Figure 5 , Figure 7 and Figure 8 The bearing chamber 50 has a first bottom wall 52 located on the side of the bearing 51 facing away from the rotor assembly 30. A spray hole 521 is provided on the first bottom wall 52, and a third pipeline 65 is connected to the spray hole 521.

[0070] The number and size of the nozzles 521 are increased according to the heat dissipation requirements of the bearing chamber 50, so that the coolant is more evenly distributed in the bearing chamber 50, improving the cooling effect. Thus, the coolant is sprayed into the bearing chamber 50 through the nozzles 521 via the third pipe 65, flows through the bearing 51, and then flows towards the rotor assembly 30. The design of the nozzles 521 allows the coolant to be precisely sprayed onto the parts of the bearing 51 that require cooling, effectively reducing the temperature of the bearing 51, preventing damage to the bearing 51 due to localized overheating, ensuring the normal operation of the bearing 51, improving the reliability of the motor 100, and reducing downtime and maintenance costs of the motor 100 due to bearing 51 failure.

[0071] Furthermore, the bearing chamber 50 has a first circumferential wall 53 surrounding the outer periphery of the bearing 51. The bottom of the first circumferential wall 53 has an opening 531 facing the liquid collection chamber 16. The opening 531 is axially located between the bearing 51 and the separator 40. In this embodiment, the opening 531 is located above the liquid collection chamber 16. Under the influence of gravity, most of the coolant flowing through the bearing 51, which serves to cool and lubricate it, flows from the opening 531 into the liquid collection chamber 16. This accelerates the coolant discharge rate and prevents coolant accumulation in the bearing chamber 50. Coolant accumulation can increase the rotational resistance of the bearing 51, leading to increased energy consumption of the motor 100 and even affecting its normal operation. Additionally, it prevents excessive coolant from flowing into the shaft of the rotor assembly 30, which would increase the rotational resistance of the rotor assembly 30. The design of the opening 531 ensures smooth coolant circulation and guarantees the normal operation of the cooling system.

[0072] In optional embodiments, please refer to the following: Figure 1 , Figure 5 and Figure 9 The first channel 13 includes an outer flow path 131 disposed above the stator assembly 20. The outer flow path 131 has a first arc-shaped wall 133 extending circumferentially on the side facing the stator assembly 20. The first arc-shaped wall 133 has a plurality of first nozzles 711 spaced apart circumferentially.

[0073] In this embodiment, the number and size of the first nozzles 711 can be increased in areas of the stator assembly 20 with high heat generation, specifically enhancing cooling of high-temperature areas. The curvature of the first arc-shaped wall 133 is optimized according to the shape of the stator assembly 20, allowing the coolant to be sprayed more evenly onto the outer surface of the windings in the stator assembly 20, improving the cooling effect. Thus, the coolant is introduced from the inlet 15 into the outer flow path 131 and flows, then is sprayed onto the winding surface of the stator assembly 20 through the first nozzles 711 for cooling. Multiple spaced first nozzles 711 allow the coolant to evenly cover the outer circumference of the windings, and the direct spray cooling method improves the heat exchange efficiency between the coolant and the stator assembly 20, quickly removing the heat generated by the stator assembly 20 and ensuring stable operation of the stator assembly 20. Through precise design of the nozzle position and size, the problem of local overheating of the stator assembly 20 caused by uneven temperature can be reduced, improving the performance and reliability of the motor 100.

[0074] Specifically, inlet 15 is connected to outer flow path 131 via first pipe 63, and multiple first nozzles 711 are arranged in increasing size along the circumferential direction away from first pipe 63. This makes the coolant flow rate from each first nozzle 711 more uniform, achieving a more balanced cooling effect. Preferably, stator assembly 20 includes multiple circumferentially spaced segmented iron cores 21, and each first nozzle 711 is radially positioned opposite the gap between every two segmented iron cores 21. This allows the coolant to be precisely sprayed onto the surface of the winding through the nozzles, achieving optimal cooling.

[0075] In this embodiment, the increasing size of the first nozzle 711 causes the coolant spray volume to gradually increase as the distance from the first pipe 63 increases during circumferential flow, compensating for the pressure loss of the coolant during flow and ensuring that all circumferential parts of the stator assembly 20 are adequately cooled. Furthermore, the first nozzle 711 is aligned with the gaps between the segmented iron cores 21, allowing the coolant to directly enter the interior of the stator assembly 20, cooling the windings between the two iron cores and cooling areas with concentrated heat, thus improving heat dissipation efficiency. The synergistic effect of these two designs further optimizes the cooling effect of the stator assembly 20, ensuring stable operation of the motor 100 and reducing the risk of failure due to overheating of the stator assembly 20.

[0076] Please continue to refer to the following: Figure 4 , Figure 8 and Figure 11 The housing 10 includes a second peripheral wall 17 surrounding the stator assembly 20. An arc-shaped groove 70 is formed on the second peripheral wall 17 above the stator assembly 20. The motor 100 also includes a spray plate 71, which covers the opening side of the arc-shaped groove 70 to form an outer flow path 131 together with the second peripheral wall 17. The spray plate 71 constitutes a first arc-shaped wall 133. In this embodiment, the depth and curvature of the arc-shaped groove 70 are optimized according to the coolant flow requirements and the shape of the stator assembly 20, making the coolant flow more smoothly within the flow path. The connection method between the spray plate 71 and the second peripheral wall 17 can be selected as needed. For example, welding can be used, which provides a strong and well-sealed connection, effectively preventing coolant leakage. Bolts can also be used for easy installation and disassembly, facilitating later maintenance and repair. A snap-fit ​​connection can also be used for easy assembly and maintenance.

[0077] In this embodiment, the spray plate 71 and the second peripheral wall 17 enclose an outer flow path 131, through which coolant flows and cools the stator assembly 20 through the first nozzle 711 on the spray plate 71. This structural design facilitates the manufacturing and installation of the outer flow path 131, reducing processing difficulty and cost compared to a complex integrated structure.

[0078] In other embodiments that can be combined with this implementation, please refer to [the relevant documentation]. Figure 1 , Figure 5 and Figure 9 The first channel 13 includes an inner flow path 132 disposed in the inner ring of the stator assembly 20. The inner flow path 132 is arranged in an upward curved arc shape and has a second arc wall 134 facing the stator assembly 20. A plurality of second nozzles 811 are provided on the second arc wall 134 at intervals along the circumference.

[0079] The curvature and bending degree of the inner ring flow path 132 are optimized according to the inner ring structure of the stator assembly 20, so that the coolant can better conform to the inner ring direction of the stator assembly 20 and flow in the direction of the inner ring, thereby increasing the contact range between the coolant and the winding and improving the heat dissipation effect. The number, size and spacing of the second nozzle 811 are adjusted according to the heat dissipation requirements of the inner ring of the stator assembly 20, such as increasing the number of nozzles and increasing the nozzle size in the winding area where heat is concentrated.

[0080] In this embodiment, the coolant flowing into the first pipe 63 through inlet 15 is guided to the inner ring flow path 132 and sprayed onto the inner ring surface of the stator assembly 20 through the second nozzle 811 for cooling. Utilizing the gravity and flow inertia of the coolant, the coolant sprayed from the first nozzle 711 and the second nozzle 811 fully cools the upper half of the stator assembly 20 and then flows to the lower half of the stator assembly 20, providing thorough cooling. Multiple second nozzles 811 are distributed circumferentially to ensure that the coolant evenly covers the inner ring surface of the stator assembly 20, cooling the stator assembly 20 from the inner ring. Working in conjunction with the outer ring flow path 131, this achieves all-around cooling of the stator assembly 20, greatly improving the heat dissipation efficiency of the stator assembly 20 and effectively reducing its temperature.

[0081] Furthermore, inlet 15 is connected to inner ring flow path 132 via second pipe 64, and multiple second nozzles 811 are arranged in increasing size along the circumferential direction away from second pipe 64. This makes the coolant flow rate from each second nozzle 811 more uniform, achieving a more balanced cooling effect. In this embodiment, the increasing size of the second nozzles 811 causes the coolant spray volume to gradually increase as the distance from second pipe 64 increases during circumferential flow, compensating for the pressure loss of the coolant during flow and ensuring that all parts of the inner ring of stator assembly 20 are adequately cooled.

[0082] Furthermore, please refer to the following: Figure 4 , Figure 8 , Figure 12 and Figure 13The housing 10 includes a second bottom wall 18 facing radially upwards towards the stator assembly 20. An annular groove 80 is formed on the second bottom wall 18. The motor 100 also includes a spray block 81, which covers the upper half of the opening side of the annular groove 80, forming an inner flow path 132 together with the second bottom wall 18. The spray block 81 constitutes a second arc-shaped wall 134. The depth and width of the annular groove 80, as well as the thickness of the spray block 81, can be flexibly adjusted according to the flow rate, velocity, and heat dissipation requirements of the coolant. The connection method between the spray block 81 and the second bottom wall 18 can be selected as needed. For example, adhesive bonding ensures a tight connection without leakage risk, while screw connection provides a secure connection and facilitates disassembly and maintenance.

[0083] In this embodiment, the spray block 81 and the second bottom wall 18 enclose an inner ring flow path 132. The coolant flows in the inner ring flow path 132 and cools the inner ring of the stator assembly 20 through the second nozzle 811 on the spray block 81. This structure is simple and easy to manufacture and assemble. By rationally designing the structural parameters of the annular groove 80 and the spray block 81, the flow path and speed of the coolant can be effectively controlled, allowing it to flow stably within the flow path and be evenly sprayed onto the inner ring of the stator assembly 20.

[0084] It would be best to refer to Figures 7 to 9 The second bottom wall 18 is also formed with a confluence channel 82 extending in the vertical direction. The upper end of the confluence channel 82 is connected to the annular groove 80, and the lower end of the confluence channel 82 is connected to the liquid collection chamber 16. Preferably, the confluence channel 82 is located below the through-hole 531.

[0085] Thus, after cooling the stator assembly 20 in the inner ring flow path 132, the coolant flows into the collection chamber 16 through the manifold 82. Coolant accumulated in the bearing chamber 50 can also flow into the collection chamber 16 through the manifold 82. The manifold 82 provides a smooth return channel for the coolant, allowing it to flow smoothly from the stator assembly 20 and the bearing chamber 50 back to the collection chamber 16, preventing coolant accumulation inside the motor 100, ensuring smooth circulation of coolant within the motor 100, maintaining the normal operation of the cooling system, improving the heat dissipation efficiency and operational stability of the motor 100, and ensuring reliable operation of the motor 100.

[0086] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure made using the contents of the present invention specification and drawings, or any direct or indirect application in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An electric motor, characterized in that, include: The housing has a second chamber and a second channel formed therein, the second channel being used to introduce coolant into the second chamber; as well as, The rotor assembly is rotatably mounted in the second chamber; The second channel is configured such that the coolant flowing into the second chamber forms a mist-like fluid under the agitation of the rotor assembly.

2. The motor as described in claim 1, characterized in that, The motor also includes a stator assembly and a cooling device. A first chamber and a first channel are formed inside the housing. The stator assembly is installed in the first chamber. The first channel connects the outlet of the cooling device and the first chamber. A first outlet connecting the first chamber and a second outlet connecting the second chamber are also formed inside the housing. Both the first outlet and the second outlet are connected to the inlet of the cooling device.

3. The motor as described in claim 2, characterized in that, The motor further includes a separator disposed between the first chamber and the second chamber to define a second channel forming a communication between the first chamber and the second chamber, the second channel being used to partially introduce coolant from the first chamber into the second chamber.

4. The motor as described in claim 3, characterized in that, The second chamber has an annular region surrounding the outer periphery of the rotor assembly, one end of the second channel forms a liquid inlet facing the second chamber, and the separator is configured such that the axial projection of the liquid inlet at least partially coincides with the annular region.

5. The motor as described in claim 4, characterized in that, The liquid inlet is arranged in a ring shape extending circumferentially; or, The liquid inlet is provided in multiple ways, and the multiple liquid inlets are distributed at intervals in the circumferential direction.

6. The motor as described in claim 3, characterized in that, The stator assembly and the rotor assembly are arranged side by side in the axial direction, and the separator is a partition plate installed on the stator assembly; A first gap is defined between the outer periphery of the partition and the inner wall of the housing, the first gap forming at least a portion of the second channel; and / or, The housing also includes a bearing chamber, in which a bearing is installed. The rotor assembly is rotatably supported by the bearing. A partition is arranged around the outer periphery of the bearing chamber, and a second gap is defined between the inner periphery of the partition and the first peripheral wall of the bearing chamber. The second gap constitutes at least a portion of the second channel.

7. The motor as described in claim 6, characterized in that, The stator assembly includes multiple segmented iron cores, and the partition plate has multiple mounting holes, with each segmented iron core being inserted into one of the mounting holes.

8. The motor as described in any one of claims 1 to 7, characterized in that, One end of the second channel forms a liquid inlet facing the second chamber. The liquid inlet is elongated and its width dimension is less than or equal to 0.5 mm.

9. The motor as described in any one of claims 2 to 7, characterized in that, The upper end of the housing has an inlet, and the lower end of the housing has a liquid collection chamber. The motor also includes a circulation pipe connecting the inlet and the liquid collection chamber. The cooling device is installed on the circulation pipe. The inlet is connected to the first channel. The first outlet is located at the bottom of the first chamber, and the second outlet is located at the bottom of the second chamber. The first outlet and the second outlet are respectively connected to the liquid collection chamber.

10. The motor as described in any one of claims 2 to 7, characterized in that, There are two first chambers, which are axially located on both sides of the second chamber. There are two stator assemblies, with one stator assembly installed in each of the first chambers.

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