A heat dissipation structure of a motor stator and a motor

Abstract

This invention discloses a heat dissipation structure for a motor stator and a motor. The motor stator is composed of several stator units, each including a stator core, a frame, and windings. The windings are located on stator teeth of the stator core via the frame. The outer and inner ends of the stator are located at the two ends of the stator teeth, respectively. The outer ends of the stator are sequentially spliced ​​together to form the outer ring of the motor stator, and the inner ends of the stator are arranged to form the inner ring of the motor stator. The evaporator-condenser tubes of the heat dissipation structure connect the evaporation section and the condensation device into a circulation loop. The evaporation section is respectively located at the inner end of the stator, the stator teeth, and the outer end of the stator. The condensation device and the evaporator-condenser tubes are located outside the motor stator. By distributing the evaporation section at the inner and outer ends and teeth of the stator units to form a heat dissipation network, the structure of the stator units effectively increases heat dissipation. The condensation device is located outside the motor stator to prevent heat from circulating secondary within the motor stator. The phase change circulation of the working fluid significantly improves the heat dissipation efficiency per unit volume and maintains the temperature stability of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a heat dissipation structure for a motor stator and a motor. Background Technology

[0002] A torque motor is a direct-drive motor that can output high torque at low speeds and is often used in high-precision control applications. It converts electrical energy into mechanical energy based on the law of electromagnetic induction, providing a power source for electrical appliances or machinery. During motor operation, various losses are inevitable, most of which are converted into heat, causing the motor to heat up and thus reducing its efficiency. The core heat dissipation problem of motors stems from the heating of the stator windings and stator core caused by high current density. Especially in miniaturized frameless designs, the lack of traditional heat dissipation structures (such as fans) makes it easy for heat to accumulate internally, leading to rapid temperature rise, decreased efficiency, and insulation aging. At the same time, the insufficient heat dissipation area and obstructed heat flow paths within the compact space of the stator further exacerbate the risk of localized overheating, bringing more hidden dangers and limitations to the motor's operation. Summary of the Invention

[0003] In response to the problems raised in the background art, the purpose of this invention is to propose a heat dissipation structure and motor for a torque motor, which solves the problems of low heat dissipation efficiency of motor stator, uneven heat distribution, and easy local overheating in the prior art.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A heat dissipation structure for an electric motor stator includes an electric motor stator and a heat dissipation structure. The electric motor stator is composed of several stator units spliced ​​together. Each stator unit includes a stator core, a frame, and a winding. The winding is wound around the stator teeth of the stator core through the frame. The stator core also includes an outer stator end and an inner stator end. The outer stator end and the inner stator end are respectively located at both ends of the stator teeth. The left and right sides of several outer stator ends are sequentially spliced ​​together to form the outer ring of the electric motor stator, and several inner stator ends are formed to form the inner ring of the electric motor stator.

[0006] The heat dissipation structure includes an evaporation section, a condensation device, and an evaporation-condensation tube. The evaporation-condensation tube connects the evaporation section and the condensation device into a continuous circulation loop. The circulation loop is filled with a liquid working fluid. The evaporation section is respectively arranged at the inner end, stator teeth, and outer end of several stator units. The condensation device and the evaporation-condensation tube are located outside the motor stator.

[0007] Preferably, the evaporation section includes a first evaporation section, a second evaporation section, and a third evaporation section;

[0008] The first evaporation section includes a plurality of first slot channels and a plurality of slot connecting members. The first slot channels are located inside the inner end of the stator, wherein two adjacent first slot channels at the inner end of the stator are connected to the condensing device through the evaporation condenser tube, and other adjacent first slot channels at the inner end of the stator are connected through the slot connecting members.

[0009] The second evaporation section includes several sets of heat pipes, which are respectively wound around several frames, and the heat pipes and the windings do not interfere with each other;

[0010] The third evaporation section includes a plurality of second groove channels, which are located inside the outer end of the stator, and the second groove channels of adjacent outer ends of the stator are interconnected.

[0011] The two ends of the heat pipe are respectively connected to the first slot channel and the second slot channel located in the same stator core.

[0012] Preferably, one end of the stator tooth is connected to the outer surface of the inner end of the stator, and the other end of the stator tooth is connected to the inner surface of the outer end of the stator, and the horizontal cross-section of the stator core is I-shaped.

[0013] The stator inner end is provided with a first liquid inlet and a first liquid outlet on the left and right sides respectively, and the stator inner end is provided with a first circulation liquid exchange port on the outer side. The first circulation liquid exchange port does not interfere with the stator teeth. The first liquid inlet, the first liquid outlet and the first circulation liquid exchange port are respectively connected to the first tank channel.

[0014] The liquid inlet end of the evaporator condenser tube is connected to the first liquid inlet of one of the inner ends of the stator, and the liquid outlet end of the evaporator condenser tube is connected to the first liquid outlet of another adjacent inner end of the stator. The first liquid inlets of other inner ends of the stator are connected to the first liquid outlets of another adjacent inner end of the stator through the groove connecting member.

[0015] The first circulating liquid exchange port is connected to one end of the heat pipe.

[0016] Preferably, the first slot channel extends along the horizontal and / or vertical direction of the inner end of the stator and is distributed inside the inner end of the stator, forming a continuous and interconnected slot network.

[0017] Preferably, the skeleton is an annular structure surrounding and covering the outside of the stator teeth, the winding is wound around the outer ring side of the skeleton, and the heat pipe is wound around the inner ring side of the skeleton.

[0018] Preferably, a second liquid inlet and a second liquid outlet are respectively provided on the left and right sides of the outer end of the stator, and a second circulation liquid exchange port is provided on the inner side of the outer end of the stator. The second circulation liquid exchange port does not interfere with the stator teeth, and the second liquid inlet, the second liquid outlet and the second circulation liquid exchange port are respectively connected to the second tank channel.

[0019] The second liquid inlet at the outer end of one stator is connected to the second liquid outlet at the outer end of the other adjacent stator;

[0020] The second circulating liquid exchange port is connected to the other end of the heat pipe.

[0021] Preferably, the second channel includes a plurality of horizontal channels and vertical channels. The horizontal channels extend horizontally through the left and right sides of the outer end of the stator. The two ends of the horizontal channels are the second liquid inlet and the second liquid outlet, respectively. The plurality of horizontal channels are spaced apart in the vertical direction. The vertical channels extend in the vertical direction of the outer end of the stator and are disposed inside the outer end of the stator. The vertical channels are connected to the plurality of horizontal channels.

[0022] A plurality of second liquid inlets at the outer end of one stator are connected one-to-one with a plurality of second liquid outlets at the outer end of the adjacent stator.

[0023] An electric motor includes a motor stator, a heat dissipation structure, and a motor rotor. The motor stator is disposed on the outer periphery of the motor rotor. The motor stator is provided with the heat dissipation structure. The motor stator is composed of a plurality of stator units spliced ​​together. The heat dissipation structure is the aforementioned heat dissipation structure.

[0024] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0025] A three-dimensional heat dissipation network is formed by distributing evaporation components at the inner and outer ends and teeth of the stator unit, effectively increasing heat dissipation by utilizing the structure of the stator unit itself. The external placement of the condenser on the motor stator prevents heat from circulating secondary within the stator. The phase change cycle of the working fluid significantly improves the heat dissipation efficiency per unit volume, maintaining the temperature stability of the motor under long-term high-load conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the motor of the present invention;

[0027] Figure 2 This is an exploded view of the stator unit of the present invention;

[0028] Figure 3 This is a schematic diagram of the stator core structure of the present invention (only one second liquid inlet / second liquid outlet is shown);

[0029] Figure 4 This is another structural schematic diagram of the stator core of the present invention;

[0030] Figure 5 This is a top view of the stator core of the present invention;

[0031] Figure 6 yes Figure 5 Sectional view of AA;

[0032] Figure 7 yes Figure 5 Sectional view of BB;

[0033] Figure 8 yes Figure 2 A cross-sectional view of the frame (ignoring the stator core and windings);

[0034] Figure 9 This is a schematic diagram of the heat dissipation structure of the present invention.

[0035] The components include: motor stator 1, stator unit 10, stator core 11, stator outer end 111, second liquid inlet 1111, second liquid outlet 1112, second circulating liquid exchange port 1113, stator inner end 112, first liquid inlet 1121, first liquid outlet 1122, first circulating liquid exchange port 1123, stator teeth 113, frame 12, winding 13, evaporation section 21, first channel 211, heat pipe 212, second channel 213, horizontal channel 2131, vertical channel 2132, condensation device 22, evaporation and condensation pipe 23, and motor rotor 3. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., 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 invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0039] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] The following is in conjunction with the appendix Figures 1 to 9 The technical solution of the present invention will be further illustrated through specific embodiments.

[0041] A heat dissipation structure for an electric motor stator includes an electric motor stator 1 and a heat dissipation structure. The electric motor stator 1 is composed of several stator units 10 spliced ​​together. Each stator unit 10 includes a stator core 11, a frame 12, and a winding 13. The winding 13 is wound around the stator teeth 113 of the stator core 11 through the frame 12. The stator core 11 also includes an outer stator end 111 and an inner stator end 112. The outer stator end 111 and the inner stator end 112 are respectively located at both ends of the stator teeth 113. The left and right sides of several outer stator ends 111 are spliced ​​together to form the outer ring of the electric motor stator 1, and several inner stator ends 112 are formed to form the inner ring of the electric motor stator 1.

[0042] The heat dissipation structure includes an evaporation section 21, a condensation device 22, and an evaporation-condensation tube 23. The evaporation-condensation tube 23 connects the evaporation section 21 and the condensation device 22 into a continuous circulation loop. The circulation loop is filled with a liquid working fluid. The evaporation section 21 is respectively arranged at the inner stator end 112, stator teeth 113, and outer stator end 111 of several stator units 10. The condensation device 22 and the evaporation-condensation tube 23 are located outside the motor stator 1.

[0043] In existing technologies, torque motors often employ a frameless design due to the need for compact structure, making it impossible to effectively integrate traditional heat dissipation devices. Heat generation is concentrated in the stator windings and core, and due to the limited space, heat cannot be effectively dissipated through natural convection or conduction, leading to significant localized temperature rises. Especially under high load conditions, hot spots easily form in the contact area between the stator teeth and windings due to blocked heat flow paths, accelerating the aging of insulation materials and reducing the reliability of motor operation.

[0044] This application proposes a heat dissipation structure for an electric motor stator, comprising an electric motor stator 1 composed of multiple stator units 10 and a heat dissipation structure. Each stator unit 10 includes a stator core 11, a frame 12, and windings 13. The stator core 11 has an outer stator end 111, an inner stator end 112, and stator teeth 113 connecting the two. The heat dissipation structure includes an evaporator section 21, a condenser device 22, and an evaporator-condenser tube 23 connecting the two. The evaporator section 21 is distributed at the inner stator end 112, the stator teeth 113, and the outer stator end 111. The liquid working fluid in the circulation loop transfers heat to the external condenser device 22 through a phase change.

[0045] The stator unit 10 refers to an independent unit that is mechanically assembled to form the motor stator 1. Each stator unit 10 has a complete stator core 11 structure and winding space for the windings 13. The evaporation section 21 refers to a phase change heat transfer unit that is in direct contact with the heating area of ​​the motor stator 1. Specifically, it can be implemented using microchannels embedded inside the stator core 11 or external heat pipe structures. The circulation loop refers to a closed pipeline system connecting the evaporation section 21 and the condensation device 22 by the evaporation-condensation pipes 23. The working fluid achieves heat transfer through a liquid-gas phase change cycle. The annular structure formed by the splicing of the outer ends of the stator units 10 maintains the overall mechanical strength of the motor stator 1 and provides a structural basis for the evaporation section 21 to form a continuous heat dissipation channel between the stator units 10.

[0046] Specifically, after the stator units 10 are assembled, the inner stator ends 112 of each stator unit 10 surround to form the inner ring of the motor stator 1, and the outer stator ends 111 surround to form the outer ring of the motor stator 1. The stator evaporation section 21 absorbs heat through the inner ring of the motor stator 1 (equivalent to the inner stator ends 112 of each individual core), each winding (equivalent to the stator teeth 113 of each individual core), and the outer ring (equivalent to the outer stator ends 111 of each individual core). The working fluid then vaporizes and is transported to the condensation device 22 via the evaporation condenser pipe 23 for heat dissipation and liquefaction. The liquid working fluid then flows back to the evaporation section 21. Preferably, the outer stator ends 111 of each stator unit 10 are connected by welding. Preferably, the liquid working fluid is a fluorinated liquid. Fluorinated liquids have good insulation properties and can directly contact live parts (such as windings); at the same time, considering the chemical inertness of fluorinated liquids, they are compatible with motor materials such as copper and epoxy resin, and there is no risk of corrosion.

[0047] Compared to existing technologies, traditional frameless motors rely on external air cooling or casing heat dissipation, which cannot solve the problem of blocked internal heat flow paths. This solution reconfigures the heat dissipation space through a split motor stator, allowing the evaporator 21 to be directly embedded in the heat source of each stator unit 10, without the need to increase the heat dissipation surface area. The phase change cycle system breaks through the limitations of traditional heat conduction paths, utilizing the latent heat of phase change of the working fluid to achieve efficient heat transfer, which is especially suitable for compact motors with limited axial length.

[0048] Through the above technical solution, the present invention achieves three-dimensional heat dissipation from the inside of the motor stator, avoiding heat accumulation in the contact area between the windings and the iron core. The evaporation section 21 is distributed at the inner and outer ends and teeth of the stator unit 10, forming a three-dimensional heat dissipation network, effectively increasing heat dissipation by utilizing the structure of the stator unit 10 itself. The external placement of the condensation device 22 on the motor stator 1 prevents secondary heat circulation inside the motor stator. The working fluid phase change cycle significantly improves the heat dissipation efficiency per unit volume, maintaining the temperature stability of the motor under long-term high-load conditions.

[0049] Furthermore, the evaporation section 21 includes a first evaporation section, a second evaporation section, and a third evaporation section;

[0050] The first evaporation section includes a plurality of first slot channels 211 and a plurality of slot connecting members. The first slot channels 211 are located inside the stator inner end 112, wherein two adjacent first slot channels 211 of the stator inner end 112 are connected to the condensing device 22 through the evaporation condenser tube 23, and other adjacent first slot channels 211 of the stator inner end 112 are connected through the slot connecting members.

[0051] The second evaporation section includes several sets of heat pipes 212, which are respectively wound around several frames 12. The heat pipes 212 and the windings 13 do not interfere with each other.

[0052] The third evaporation section includes a plurality of second groove channels 213, which are disposed inside the stator outer end 111, and the second groove channels 213 of adjacent stator outer ends 111 are interconnected.

[0053] The two ends of the heat pipe 212 are respectively connected to the first slot channel 211 and the second slot channel 213 located in the same stator core 11.

[0054] The first evaporation section comprises a first slot channel 211 located inside the stator inner end 112 and a slot connecting member connecting two adjacent first slot channels 211. The first slot channel 211 refers to a continuous network of through channels extending axially and / or circumferentially along the motor stator 1 inside the stator inner end 112. Specifically, it can be formed by machining or casting to create internal flow channels. Its function is to provide a flow path for the liquid working fluid, transferring the heat generated in the stator inner end 112 to the condenser 22 through a phase change of the working fluid. The slot connecting member refers to a tubular or slotted structure connecting the first slot channels 211 of adjacent stator inner ends 112. Specifically, it can be a metal corrugated pipe or an injection-molded connecting channel. Its function is to achieve the circulating flow of the working fluid between adjacent stator inner ends 112, maintaining the continuity of the heat dissipation structure.

[0055] The second evaporation section is a heat pipe 212 wound around the frame 12. The heat pipe 212 refers to a heat transfer element with a capillary structure. Specifically, a copper powder sintered core heat pipe can be used. Its function is to quickly remove the heat from the winding 13 region through the working fluid evaporation-condensation phase change process.

[0056] The second channel 213 refers to the interconnected channels set inside the stator outer end 111. Specifically, it can be a cross network structure extending along the inside of the stator outer end 111. Its function is to cool down the heat of the stator outer end 111 by vaporizing the liquid working fluid and dissipating it evenly.

[0057] Specifically, the first slot channel 211 of the stator inner end 112 forms a local circulation loop (equivalent to the first evaporation section) through a slot connector. Only two ends of the stator inner end 112 are connected to the external condensation device 22 through the evaporator-condenser tube 23, while the remaining stator inner ends 112 achieve working fluid flow through the internal channel network of the first slot channel 211. The heat pipes 212 around the frame 12 are wound around the inner ring side of the frame 12, maintaining physical isolation from the winding 13 to avoid electromagnetic interference or physical collision. One end of the heat pipe 212 is connected to the first slot channel 211 of the stator inner end 112, and the other end of the heat pipe 212 is connected to the second slot channel 213 of the stator outer end 111, forming a cross-regional heat dissipation path. The second slot channel 213 of the stator outer end 111 is connected to the adjacent stator outer end 111 through a horizontal channel, so that all stator outer ends 111 form an overall heat dissipation network (equivalent to the third evaporation section). To further explain, the specific heat dissipation principle of the heat dissipation structure is as follows: the liquid working fluid enters the first evaporation section located on the inner end 112 of the stator from the condensing device 22 via the evaporator-condenser pipe 23 at one end; simultaneously, since each heat pipe 212 is connected to the first slot channel 211 and the second slot channel 213 respectively, the liquid working fluid also flows through and enters the second evaporation section located on the frame 12 (stator teeth 113) and the third evaporation section located on the outer end 111 of the stator. Since the evaporation sections are interconnected, the finally vaporized working fluid flows back to the condensing device 22 via the evaporator-condenser pipe 23 at the other end to liquefy.

[0058] Compared with existing technologies, current heat dissipation structures typically employ a single cooling channel or external heat sinks, which are insufficient to cover the entire stator area, leading to interrupted heat flow paths and localized high temperatures. This invention addresses this by providing an evaporation section in all directions on the stator unit 10. Specifically, a channel network is constructed at the inner end 112 of the stator, non-interfering heat pipes 212 are arranged in the winding 13 (stator teeth 113) area, and interconnected channels are formed at the outer end 111 of the stator. These three interconnections ensure that heat from all parts of the stator unit 10 can be exchanged from the evaporation section 21 through the evaporator-condenser pipe 23 and the condenser device 22, achieving multi-level coordinated heat transfer.

[0059] Through the above technical solution, this application solves the problem of local overheating caused by the discontinuous heat dissipation path between spliced ​​stator units. The inner end of the stator forms a closed-loop flow through slot connectors to avoid working fluid stagnation; the heat pipes are separated from the winding space to ensure the feasibility of winding operations; and the interconnected slots at the outer end of the stator eliminate heat dissipation blind spots in the splicing gaps. The three evaporation sections form a composite working fluid flow path of "local parallel connection + overall series connection." This design ensures the uniform distribution of liquid working fluid in the inner end 112 of the stator and connects the first slot channel 211 (inner end of the stator) and the second slot channel 213 (outer end of the stator) in series through heat pipes 212, forming a global flow of the working fluid, preventing localized drying or accumulation of the working fluid, and improving the stability and reliability of the heat transfer system.

[0060] Furthermore, one end of the stator tooth 113 is connected to the outer surface of the inner stator end 112, and the other end of the stator tooth 113 is connected to the inner surface of the outer stator end 111. The horizontal cross-section of the stator core 11 is in the shape of an "I".

[0061] The stator inner end 112 is provided with a first liquid inlet 1121 and a first liquid outlet 1122 on the left and right sides respectively, and the stator inner end 112 is provided with a first circulation liquid exchange port 1123 on the outer side. The first circulation liquid exchange port 1123 does not interfere with the stator teeth 113. The first liquid inlet 1121, the first liquid outlet 1122 and the first circulation liquid exchange port 1123 are respectively connected to the first tank channel 211.

[0062] The liquid inlet end of the evaporator condenser tube 23 is connected to the first liquid inlet 1121 of one of the stator inner ends 112, and the liquid outlet end of the evaporator condenser tube 23 is connected to the first liquid outlet 1122 of another adjacent stator inner end 112. The first liquid inlet 1121 of the other stator inner ends 112 is connected to the first liquid outlet 1122 of another adjacent stator inner end through the groove connecting member.

[0063] The first circulating liquid exchange port 1123 is connected to one end of the heat pipe 212.

[0064] The I-shaped structure of the stator core 11 ensures the mechanical strength of the stator core 11 while providing space for the distribution of the slot channels. The first liquid inlet 1121 and the first liquid outlet 1122 are respectively located on the left and right sides of the inner end 112 of the stator as the fluid inlet and outlet, respectively. These can be formed using drilling or casting processes, and are used to guide the liquid working fluid into and out of the first slot channel 211. The first circulation port 1123 is a fluid exchange port located on the outer side of the inner end 112 of the stator, and can be created by milling. It is used to divert the working fluid in the first slot channel 211 to the heat pipe 212. The slot connector is a tubular component used to connect the first slot channels 211 of adjacent inner ends 112 of the stator. It is made of, for example, copper alloy or aluminum alloy, and its length matches the splicing gap of the stator units, realizing the transfer of working fluid between stator units.

[0065] Specifically, the I-shaped cross-section allows the stator core 11 to form a stable support structure in the radial direction, and the network of first slot channels 211 can be uniformly distributed along the interior of the stator inner end 112. When the liquid working fluid enters the first inlet 1121 of a certain stator inner end 112 through the evaporator-condenser tube 23, part of the working fluid flows along the first slot channel 211 to the first outlet 1122 and then flows through the slot connector into the first inlet 1121 of the adjacent stator inner end 112, flowing sequentially through the entire first evaporation section; the other part of the working fluid enters the heat pipe 212 through the first circulation exchange port 1123 on the outer side of the stator inner end 112. In other words, the stator inner ends 112 that are not directly connected to the evaporator-condenser tube 23 achieve series connection of working fluid between adjacent stator inner ends 112 through the slot connector, while the connection between the first circulation exchange port 1123 of each stator inner end 112 and the heat pipe 212 forms multiple parallel flow branches. This arrangement adds a radial heat dissipation path to the working fluid's single circumferential flow in the motor stator. The space avoidance design between the stator teeth 113 and the first circulating fluid exchange port 1123 ensures that the winding area is not disturbed by the flow. The alternating connection of the fluid ports of adjacent stator units 10 forms a distributed circulating channel network, avoiding the problem of reduced cooling efficiency in the stator section at the far end in a single working fluid loop design.

[0066] Furthermore, the first slot channel 211 extends along the horizontal and / or vertical direction of the inner end 112 of the stator and is distributed inside the inner end 112 of the stator, forming a continuous and interconnected slot network.

[0067] The first channel 211 extends horizontally and vertically to cover as much of the length (horizontal) and height (vertical) of the stator inner end 112 as possible, thereby enhancing the flow capacity and coverage of the heat dissipation medium within the stator inner end 112. The continuously connected first channel network refers to the interconnection of horizontally and vertically extending channels to form an overall pathway. This can be achieved by connecting several horizontal and vertical channels through connecting sections, eliminating flow dead zones and improving the flow efficiency of the working medium within the first channel 211. The combined horizontal and vertical extension of the first channel network creates a three-dimensional flow path, not only expanding the heat dissipation area of ​​the first evaporator section but also enhancing the coverage of the working medium across all areas of the stator inner end 112 through the continuous design. Figure 7 The diagram shows the distribution of the first slot channel inside the stator inner end 112 in one embodiment.

[0068] Furthermore, the skeleton 12 is an annular structure surrounding and covering the outside of the stator teeth 113, the winding 13 is wound around the outer ring side of the skeleton 12, and the heat pipe 212 is wound around the inner ring side of the skeleton 12.

[0069] The ring-shaped frame 12 refers to a supporting component with a closed annular cross-section, which can be made of injection-molded insulating material. Its annular cavity provides installation space for the heat pipe arrangement. The outer ring winding 13 refers to the coil being wound and arranged along the outer circumferential surface of the frame 12. It can be made by layer-by-layer winding using automated winding equipment. The annular groove on the outer side of the frame 12 provides positioning support for the winding 13. The inner ring heat pipe 212 refers to the metal heat transfer element being arranged along the inner circumferential surface of the frame 12. It can be made of copper capillary tubes bent into shape and fits against the surface of the stator core 11 (stator teeth 113) through the guide groove inside the frame 12.

[0070] It is worth noting that the annular frame 12, which serves as the covering structure for the stator teeth 113, has outer and inner ring sides that differ from the outer and inner sides described above. Specifically, the outer ring side of the frame 12 refers to the side away from the stator teeth 113, while the inner ring side refers to the side closer to the stator teeth 113. The outer ring side is configured as the mounting area for the winding 13, and the inner ring side is configured as the area for the heat pipe 212. During assembly, the coil of the winding 13 is wound on the outer ring surface of the frame 12, forming the conductor arrangement required for electromagnetic function. The heat pipe 212 is embedded in the cavity of the inner ring side of the frame 12, forming a heat dissipation path extending along the stator teeth. The annular covering structure of the frame 12 creates axial spatial isolation between the winding 13 and the heat pipe 212. The required space thickness for winding the winding 13 does not overlap with the installation position and space required for the heat pipe 212, thus avoiding the risk of insulation damage caused by interference between the heat dissipation pipe and the winding in traditional solutions.

[0071] Traditional stator heat dissipation structures typically place heat dissipation pipes on the outside of the windings or on the back of the core, resulting in the heat dissipation path of the windings being blocked by insulating material. This invention solves the spatial conflict between the installation of the windings and the arrangement of the heat dissipation pipes inside the stator unit through a partitioned design on the inner and outer ring sides of the frame 12. While ensuring the winding accuracy of the windings 13, it allows the heat dissipation pipes to be tightly arranged along the surface of the stator core 11 (stator teeth 113). The heat pipes 212 directly absorb the heat generated by the stator teeth 113 through the inner ring side of the frame 12, avoiding the influence of the winding insulation layer on heat dissipation efficiency and effectively reducing the rate of temperature rise of the windings.

[0072] Furthermore, the stator outer end 111 is provided with a second liquid inlet 1111 and a second liquid outlet 1112 on the left and right sides respectively, and the stator outer end 111 is provided with a second circulation liquid exchange port 1113 on the inner side. The second circulation liquid exchange port 1113 does not interfere with the stator teeth 113. The second liquid inlet 1111, the second liquid outlet 1112 and the second circulation liquid exchange port 1113 are respectively connected to the second tank channel 213.

[0073] The second liquid inlet 1111 of one stator outer end 111 is connected to the second liquid outlet 1112 of the adjacent stator outer end 111;

[0074] The second circulating liquid exchange port 1113 is connected to the other end of the heat pipe 212.

[0075] The second liquid inlet 1111 and the second liquid outlet 1112 are fluid inlets and outlets respectively located at the left and right ends of the stator outer end 111. Each stator outer end 111's second liquid inlet 1111 is connected to the second liquid outlet 1112 of the adjacent stator outer end 111. When several stator outer ends 111 are joined together to form the outer ring of the motor stator 1, the second groove channels 213 inside each stator outer end 111 are interconnected. The second circulating fluid exchange port 1113 is the interface connecting the inner surface of the stator outer end 111 to the heat pipe 212. Its position avoids the area of ​​the stator teeth 113. Specifically, it can be achieved by opening a through hole on the inner surface of the stator outer end 111 that communicates with the second groove channel 213, used to introduce the working fluid in the heat pipe 212 into the internal heat dissipation structure of the stator outer end 111.

[0076] Specifically, the second channel 213 inside the stator outer end 111 forms a series loop with the second outlet 1112 of the adjacent stator outer end 111 via the second liquid inlet 1111. This allows the liquid working fluid to flow sequentially through the second channel 213 of multiple stator outer ends 111 in the circumferential direction, forming a continuous cooling network across individual units. The second circulation liquid exchange port 1113 is located on the inner side of the stator outer end 111 and is connected to the end of the heat pipe 212, allowing the working fluid that absorbs heat from the windings in the heat pipe 212 to be directly injected into the stator outer end channel for secondary cooling. The second circulation liquid exchange port 1113 is spatially separated from the stator teeth 113 to avoid mechanical interference between the connection structure of the heat pipe 212 and the stator teeth 113. For example, a groove or opening is reserved on the inner side of the stator outer end so that the axis of the second circulation liquid exchange port forms a parallel or inclined angle with the extension direction of the stator teeth, ensuring that the two do not contact each other.

[0077] Compared to existing technologies, traditional motor stator heat dissipation structures typically employ independent cooling units, with the heat dissipation channels of each stator unit isolated from each other. This results in limited working fluid flow paths and ineffective series connection, easily leading to localized high-temperature zones. This solution directly connects the working fluid inlets and outlets (second inlet and second outlet) at adjacent stator outer ends 111, constructing a distributed heat dissipation network that combines axial and circumferential directions on the outer ring of the motor stator. This significantly expands the flow coverage of the working fluid on the outer ring of the motor stator. Furthermore, by combining the first slot channel network on the inner ring of the motor stator and the heat pipe heat dissipation structure at the stator teeth, a multi-level evaporation section heat dissipation structure is formed for the entire motor stator.

[0078] Furthermore, the second channel 213 includes a plurality of horizontal channels 2131 and vertical channels 2132. The horizontal channels 2131 horizontally penetrate the left and right sides of the stator outer end 111. The two ends of the horizontal channels 2131 are the second liquid inlet 1111 and the second liquid outlet 1112, respectively. The plurality of horizontal channels 2131 are arranged at intervals along the vertical direction. The vertical channels 2132 extend along the vertical direction of the stator outer end 111 and are arranged inside the stator outer end 111. The vertical channels 2132 are connected to the plurality of horizontal channels 2131.

[0079] A plurality of second liquid inlets 1111 at one stator outer end 111 are respectively connected to a plurality of second liquid outlets 1112 at the adjacent stator outer end 111.

[0080] Horizontal channels 2131 refer to straight flow channels extending horizontally along the outer end 111 of the stator and connecting its left and right sides. They can be formed by machining or casting and are used to establish transverse cooling fluid transfer channels between adjacent stator outer ends. Vertical channels 2132 refer to longitudinal flow channels extending vertically along the outer end 111 of the stator, used to connect multiple horizontal channels 2131 to form a three-dimensional network. The one-to-one correspondence between the second inlet 1111 and the second outlet 1112 means that the ports of the horizontal channels 2131 of adjacent stator outer ends 111 form continuously aligned fluid pathways when spliced. Specifically, the interface dimensions can be controlled through standardized machining tolerances to ensure the continuity of the channel network after splicing.

[0081] Specifically, several horizontal channels 2131 are arranged at intervals along the vertical direction, allowing the cooling medium to flow laterally at different vertical positions, covering the heat dissipation needs of different areas of the stator outer end 111. Vertical channels 2132 penetrate longitudinally and interlink with each horizontal channel 2131, forming a three-dimensional flow path, enabling the working medium to achieve coordinated axial penetration and lateral diffusion within the stator outer end 111. Adjacent stator outer ends 111 are seamlessly connected by precisely aligned second inlets 1111 and second outlets 1112, avoiding fluid path interruptions due to assembly errors and ensuring that multiple stator units 10 form a complete outer ring circulation loop after assembly. Figure 6 The diagram shows the distribution of the second slot channel inside the stator outer end 111 in one embodiment.

[0082] An electric motor includes a motor stator 1, a heat dissipation structure, and a motor rotor 3. The motor stator 1 is disposed on the outer periphery of the motor rotor 3. The motor stator 1 is provided with the heat dissipation structure. The motor stator 1 is composed of a plurality of stator units 10 spliced ​​together. The heat dissipation structure is the heat dissipation structure described above.

[0083] The motor stator 1 is formed by circumferentially splicing multiple stator units 10 to form a ring stator. Each stator unit 10 includes a stator core 11, a frame 12, and windings 13. The stator units 10 are connected by snap-fit ​​or welding. The heat dissipation structure refers to a closed loop consisting of an evaporator 21, a condenser 22, and an evaporator-condenser tube 23. The closed loop is filled with a liquid working fluid, and heat transfer is achieved by utilizing the phase change of the working fluid. The evaporator 21 of the heat dissipation structure is arranged on the stator core 11 and the frame 12.

[0084] Specifically, when the motor is running, the heat generated by the windings 13 and the stator core 11 is transferred through two paths: First, the heat is absorbed by the working fluid in the first slot channel 211 of the inner stator end 112, the heat pipe 212, and the second slot channel 213 of the outer stator end 111. After the liquid working fluid evaporates, it enters the evaporation condenser tube 23 along the evaporation section 21 and is transported to the external condensation device 22. Second, the slots of adjacent stator units 10 form a continuous network through connecting parts, allowing the heat to diffuse evenly along the joints. After the condensation device cools the gaseous working fluid into a liquid state, it returns to the evaporation section by gravity, capillary action, or an external pump, completing the cycle. This design enables the heat inside the motor stator to be efficiently discharged through multiple paths, overcoming the limitations of the frameless structure on the heat dissipation area.

[0085] Compared to existing technologies, traditional frameless motors typically rely on external heat sinks or forced air cooling, making it difficult to create an effective internal heat conduction path within a compact space. This solution, however, embeds the evaporation-condensation circulation loop within the stator unit, utilizing the stator's splicing structure to naturally form a heat dissipation channel without requiring additional space. Furthermore, the integrated design of the heat pipes and the inner ring of the frame avoids winding interference, allowing heat to be directly dissipated from the heat source, solving the problem of circuitous heat flow paths in traditional solutions.

[0086] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A heat dissipation structure for a motor stator, comprising a motor stator and a heat dissipation structure, characterized in that: The motor stator is composed of several stator units spliced ​​together. Each stator unit includes a stator core, a frame, and a winding. The winding is wound around the stator teeth of the stator core through the frame. The stator core also includes stator outer ends and stator inner ends. The stator outer ends and the stator inner ends are respectively located at both ends of the stator teeth. The left and right sides of several stator outer ends are spliced ​​together in sequence to form the outer ring of the motor stator. Several stator inner ends are formed to form the inner ring of the motor stator. The heat dissipation structure includes an evaporation section, a condensation device, and an evaporation-condensation tube. The evaporation-condensation tube connects the evaporation section and the condensation device into a continuous circulation loop. The circulation loop is filled with a liquid working fluid. The evaporation section is respectively arranged at the inner end, stator teeth, and outer end of several stator units. The condensation device and the evaporation-condensation tube are located outside the motor stator. The evaporation section includes a first evaporation section, a second evaporation section, and a third evaporation section. The first evaporation section includes a plurality of first slot channels and a plurality of slot connecting members. The first slot channels are located inside the inner end of the stator, wherein two adjacent first slot channels at the inner end of the stator are connected to the condensing device through the evaporation condenser tubes, and other adjacent first slot channels at the inner end of the stator are connected through the slot connecting members. The second evaporation section includes a plurality of heat pipes, which are respectively wound around a plurality of the frame, and the heat pipes and the windings do not interfere with each other. The third evaporation section includes a plurality of second slot channels, which are located inside the outer end of the stator, and adjacent second slot channels at the outer end of the stator are interconnected. The two ends of the heat pipes are respectively connected to the first slot channel and the second slot channel located in the same stator core. One end of the stator tooth is connected to the outer surface of the inner end of the stator, and the other end of the stator tooth is connected to the inner surface of the outer end of the stator. The horizontal cross-section of the stator core is "I" shaped. The left and right sides of the inner end of the stator are respectively provided with a first liquid inlet and a first liquid outlet. The outer surface of the inner end of the stator is provided with a first circulation liquid exchange port. The first circulation liquid exchange port does not interfere with the stator tooth. The first liquid inlet, the first liquid outlet and the first circulation liquid exchange port are respectively connected to the first channel. The skeleton is a ring-shaped structure that surrounds and covers the outside of the stator teeth. The winding is wound around the outer ring side of the skeleton, and the heat pipe is wound around the inner ring side of the skeleton. The stator has a second liquid inlet and a second liquid outlet on its left and right sides respectively. The stator has a second circulation liquid exchange port on its inner side. The second circulation liquid exchange port does not interfere with the stator teeth. The second liquid inlet, the second liquid outlet and the second circulation liquid exchange port are respectively connected to the second channel.

2. The heat dissipation structure for a motor stator according to claim 1, characterized in that: The liquid inlet end of the evaporator condenser tube is connected to the first liquid inlet of one of the inner ends of the stator, and the liquid outlet end of the evaporator condenser tube is connected to the first liquid outlet of another adjacent inner end of the stator. The first liquid inlets of other inner ends of the stator are connected to the first liquid outlets of another adjacent inner end of the stator through the groove connecting member. The first circulating liquid exchange port is connected to one end of the heat pipe.

3. The heat dissipation structure for a motor stator according to claim 2, characterized in that: The first slot channel extends along the horizontal and / or vertical direction of the inner end of the stator and is distributed inside the inner end of the stator, forming a continuous and interconnected slot network.

4. The heat dissipation structure for a motor stator according to claim 1, characterized in that: The second liquid inlet at the outer end of one stator is connected to the second liquid outlet at the outer end of the other adjacent stator; The second circulating liquid exchange port is connected to the other end of the heat pipe.

5. The heat dissipation structure for a motor stator according to claim 4, characterized in that: The second channel includes several horizontal channels and vertical channels. The horizontal channels run horizontally through the left and right sides of the outer end of the stator. The two ends of the horizontal channels are the second liquid inlet and the second liquid outlet, respectively. The several horizontal channels are arranged at intervals along the vertical direction. The vertical channels extend along the vertical direction of the outer end of the stator and are arranged inside the outer end of the stator. The vertical channels are connected to the several horizontal channels. A plurality of second liquid inlets at the outer end of one stator are connected one-to-one with a plurality of second liquid outlets at the outer end of the adjacent stator.

6. An electric motor, comprising a motor stator, a heat dissipation structure, and a motor rotor, wherein the motor stator is disposed on the outer periphery of the motor rotor, and the motor stator is provided with the heat dissipation structure, characterized in that: The motor stator is composed of several stator units spliced ​​together, and the heat dissipation structure is the heat dissipation structure according to any one of claims 1 to 5.

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