Heat dissipation structure of motor stator and motor

Abstract

The invention discloses a heat dissipation structure of a motor stator and a motor, the motor stator is composed of a plurality of stator monomers, each stator monomer comprises a stator core, a skeleton and a winding, the winding is arranged on a stator tooth of the stator core through the skeleton, and a stator outer end and a stator inner end are respectively arranged at two ends of the stator tooth. Two sides of the plurality of stator outer ends are sequentially spliced to form an outer ring of the motor stator, and the plurality of stator inner ends enclose an inner ring of the motor stator; an evaporation condensation pipe of the heat dissipation structure connects evaporation parts and a condensation device to form a circulation loop, the evaporation parts are arranged at the inner end of the stator, the stator teeth and the outer end of the stator respectively, and the condensation device and the evaporation condensation pipe are arranged outside the motor stator. The evaporation parts are distributed at the inner and outer ends and the tooth parts of the stator single bodies to form a heat dissipation network, heat dissipation is effectively improved through the structure of the stator single bodies, the condensation device is externally arranged on the motor stator to prevent secondary circulation of heat in the motor stator, the heat dissipation efficiency of unit volume is remarkably improved through working medium phase change circulation, and the temperature stability of the motor is maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a heat dissipation structure of a motor stator and a motor. Background Art

[0002] A torque motor is a direct-drive motor that can output high torque at low speeds and is commonly used in high-precision control scenarios. 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 inevitably generated, most of which are converted into heat energy, causing the motor to heat up and thus reduce its efficiency. The core heat dissipation problem of the motor stems from the high current density, which causes the stator windings and stator core to heat up. Especially in miniaturized frameless designs, due to the lack of traditional heat dissipation structures (such as fans), heat easily accumulates internally, leading to rapid temperature rise, reduced efficiency, and insulation degradation. Furthermore, the limited heat dissipation area and poor heat flow path within the compact stator space further increase the risk of local overheating, introducing further risks and limitations to the motor's operation. Summary of the Invention

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

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A heat dissipation structure for a motor stator, comprising a motor stator and a heat dissipation structure, wherein the motor stator is composed of a plurality of stator monomers spliced ​​together, wherein the stator monomers include a stator core, a skeleton, and a winding, wherein the winding is wound around the stator teeth of the stator core through the skeleton, and wherein the stator core further includes a stator outer end and a stator inner end, wherein the stator outer end and the stator inner end are respectively arranged at two ends of the stator teeth, wherein the left and right sides of the plurality of stator outer ends are sequentially spliced ​​together to enclose an outer ring of the motor stator, and wherein the plurality of stator inner ends are enclosed to form an inner ring of the motor stator;

[0006] The heat dissipation structure includes an evaporation part, a condensation device and an evaporation condensation tube. The evaporation condensation tube connects the evaporation part and the condensation device to form a through circulation loop. The circulation loop is filled with liquid working medium. The evaporation part is respectively arranged at the stator inner end, stator teeth and stator outer end of several stator units. The condensation device and the evaporation condensation tube are arranged on the outside of the motor stator.

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

[0008] The first evaporation portion includes a plurality of first slot channels and a plurality of slot connecting pieces, wherein the first slot channels are provided 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 the other adjacent first slot channels at the inner end of the stator are connected through the slot connecting piece;

[0009] The second evaporation part includes a plurality of groups of heat pipes, and the plurality of groups of heat pipes are respectively wound around a plurality of the skeletons, and the heat pipes and the windings do not interfere with each other;

[0010] The third evaporation portion includes a plurality of second slot channels, wherein the second slot channels are provided inside the outer end of the stator, and adjacent second slot channels at the outer end of the stator are connected to each other;

[0011] Both ends of the heat pipe are respectively communicated with a first slot channel and a second slot channel provided in the same stator core.

[0012] Preferably, one end of the stator tooth is connected to the outer side surface of the inner end of the stator, and the other end of the stator tooth is connected to the inner side surface of the outer end of the stator, and the horizontal cross-section of the stator core is in the shape of an "I";

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

[0014] The liquid inlet end of the evaporative condenser tube is connected to the first liquid inlet of one of the inner ends of the stator, the liquid outlet end of the evaporative condenser tube is connected to the first liquid outlet of another adjacent inner end of the stator, and the first liquid inlet of the other inner end of the stator is connected to the first liquid outlet of another adjacent inner end of the stator through the slot connecting piece;

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

[0016] Preferably, the first slot channels extend along the horizontal direction and / or vertical direction of the inner end of the stator and are distributed inside the inner end of the stator to form a continuous through 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 surface of the outer end of the stator, wherein 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 groove 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 another adjacent stator;

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

[0021] Preferably, the second slot channel includes a plurality of horizontal slots and vertical slots, the horizontal slots horizontally passing through the left and right sides of the stator outer end, the slots at both ends of the horizontal slots being the second liquid inlet and the second liquid outlet respectively, the plurality of horizontal slots being arranged at intervals along the vertical direction, the vertical slots extending along the vertical direction of the stator outer end and being arranged inside the stator outer end, the vertical slots being communicated with the plurality of horizontal slots;

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

[0023] A motor comprises a motor stator, a heat dissipation structure and a motor rotor. The motor stator is arranged 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 monomers. The heat dissipation structure is the above-mentioned heat dissipation structure.

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

[0025] The evaporation unit is distributed across the inner and outer ends of the stator unit and the teeth, forming a three-dimensional heat dissipation network. This effectively increases heat dissipation by leveraging the stator unit's inherent structure. The condenser's external placement within the motor stator prevents heat from recirculating within the stator. The phase-change cycle significantly improves heat dissipation efficiency per unit volume, maintaining temperature stability under prolonged, high-load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 2 is an exploded view of a stator monomer of the present invention;

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

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

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

[0031] Figure 6 yes Figure 5 Cross-sectional view of AA;

[0032] Figure 7 yes Figure 5 Cross-sectional view of the middle BB;

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

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

[0035] Among them: motor stator 1, stator monomer 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, skeleton 12, winding 13, evaporation part 21, first slot channel 211, heat pipe 212, second slot channel 213, horizontal slot 2131, vertical slot 2132, condensing device 22, evaporation condensation tube 23 and motor rotor 3. DETAILED DESCRIPTION

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

[0037] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0038] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the quantity of the technical features being referred to. Thus, a feature identified as "first," "second," and "third" may explicitly or implicitly include one or more of the features.

[0039] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] The following is combined with Figures 1 to 9 The technical solution of the present invention is further illustrated through specific implementation methods.

[0041] A heat dissipation structure for a motor stator includes a motor stator 1 and a heat dissipation structure. The motor stator 1 is composed of a plurality of stator monomers 10 spliced ​​together. The stator monomer 10 includes a stator core 11, a skeleton 12, and a winding 13. The winding 13 is wound around the stator teeth 113 of the stator core 11 through the skeleton 12. The stator core 11 also includes a stator outer end 111 and a stator inner end 112. The stator outer end 111 and the stator inner end 112 are respectively arranged at the two ends of the stator teeth 113. The left and right sides of the plurality of stator outer ends 111 are sequentially spliced ​​together to enclose the outer ring of the motor stator 1. The stator inner ends 112 are enclosed to form the inner ring of the motor stator 1.

[0042] The heat dissipation structure includes an evaporation portion 21, a condensation device 22 and an evaporation condensation tube 23. The evaporation condensation tube 23 connects the evaporation portion 21 and the condensation device 22 to form a through circulation loop, and the circulation loop is filled with liquid working medium. The evaporation portion 21 is respectively arranged at the stator inner end 112, stator teeth 113 and stator outer end 111 of several stator monomers 10, and the condensation device 22 and the evaporation condensation tube 23 are arranged on the outside of the motor stator 1.

[0043] In existing technology, torque motors often adopt a frameless design due to the need for compactness, making it difficult to effectively integrate traditional heat dissipation devices. Heat is concentrated in the stator windings and core. Limited by the limited space, this heat is difficult to dissipate promptly through natural convection or conduction, resulting in significant localized temperature rise. Especially under high load conditions, hot spots are prone to forming in the contact area between the stator teeth and the windings due to blocked heat flow paths, accelerating insulation aging and reducing motor reliability.

[0044] The present application proposes a heat dissipation structure for a motor stator, comprising a motor stator 1 composed of a plurality of stator units 10 and a heat dissipation structure. The stator units 10 comprise a stator core 11, a skeleton 12, and a winding 13. The stator core 11 has a stator outer end 111, a stator inner end 112, and stator teeth 113 connecting the two. The heat dissipation structure comprises an evaporation portion 21, a condensation device 22, and an evaporation condensation tube 23 connecting the two. The evaporation portion 21 is distributed between the stator inner end 112, the stator teeth 113, and the stator outer end 111. The liquid working fluid in the circulation loop transfers heat to the external condensation device 22 through phase change.

[0045] Among them, the stator monomer 10 refers to an independent unit that is mechanically spliced ​​to form the entire motor stator 1. Each stator monomer 10 has a complete stator core 11 structure and a winding space for the winding 13. The evaporation part 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 by a microchannel embedded in the stator core 11 or an external heat pipe structure. The circulation loop refers to a closed pipeline system in which the evaporation part 21 and the condensing device 22 are connected by an evaporation condenser tube 23. The working medium realizes heat transfer through a liquid-gas phase change cycle. The annular structure formed by splicing the outer ends of the stator monomers 10 can maintain the overall mechanical strength of the motor stator 1, and at the same time provide a structural basis for the evaporation part 21 to form a continuous heat dissipation channel between the stator monomers 10.

[0046] Specifically, after the stator monomers 10 are spliced ​​together, the stator inner ends 112 of each stator monomer 10 surround to form the inner ring of the motor stator 1, and the stator outer ends 111 enclose to form the outer ring of the motor stator 1. After the stator evaporation portion 21 absorbs heat through the inner ring of the motor stator 1 (equivalent to passing through the stator inner ends 112 of each monomer iron core), each winding (equivalent to passing through the stator teeth 113 of each monomer iron core), and the outer ring (equivalent to passing through the stator outer ends 111 of each monomer iron core), the working fluid is vaporized and transported to the condensing device 22 through the evaporation condenser pipe 23 for heat dissipation and liquefaction. The liquid working fluid then flows back to the evaporation portion 21. Preferably, the stator outer ends 111 of each stator monomer 10 are connected by welding. Preferably, the liquid working fluid uses fluorinated liquid. Fluorinated liquid has good insulation properties and can directly contact live parts (such as windings); at the same time, considering the chemical inertness of fluorinated liquid, it is compatible with motor materials such as copper and epoxy resin, without the risk of corrosion.

[0047] Compared to existing technologies, traditional frameless motors rely on external air cooling or heat dissipation from the outer casing, which fails to address the problem of internal heat flow path blockage. This solution reconstructs the heat dissipation space by splitting the motor stator, allowing the evaporation section 21 to be directly embedded in the heat source of each stator unit 10, eliminating the need for additional heat dissipation surface area. This phase change circulation system overcomes the limitations of traditional heat conduction paths and utilizes the latent heat of the working fluid phase change to achieve efficient heat transfer, making it particularly suitable for compact motors with limited axial length.

[0048] Through the above-mentioned technical solution, the present invention achieves three-dimensional heat removal from the motor stator, preventing heat accumulation in the contact area between the winding and the core. The evaporation section 21 is distributed across the inner and outer ends and teeth of the stator unit 10, forming a three-dimensional heat dissipation network. This effectively increases heat dissipation by leveraging the inherent structure of the stator unit 10. The design of the condenser 22 external to the motor stator 1 prevents heat from recirculating 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.

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

[0050] The first evaporation portion includes a plurality of first slot channels 211 and a plurality of slot connecting members. The first slot channels 211 are provided inside the stator inner end 112. Two adjacent first slot channels 211 of the stator inner end 112 are connected to the condensing device 22 through the evaporation condensation tube 23, and the other adjacent first slot channels 211 of the stator inner end 112 are connected through the slot connecting members.

[0051] The second evaporation part includes a plurality of heat pipes 212 , which are respectively wound around a plurality of the frames 12 , and the heat pipes 212 and the windings 13 do not interfere with each other;

[0052] The third evaporation portion includes a plurality of second slot channels 213 , wherein the second slot channels 213 are provided inside the stator outer end 111 , and the second slot channels 213 of adjacent stator outer ends 111 are connected to each other;

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

[0054] The first evaporation section is a first slot channel 211 provided inside the stator inner end 112 and a slot connecting piece connecting two adjacent first slot channels 211. The first slot channel 211 refers to a continuous through-channel network extending axially and / or circumferentially within the stator inner end 112, and can be formed by machining or casting to form an internal flow channel. Its function is to provide a flow path for the liquid working medium and transfer the heat generated by the stator inner end 112 to the condensing device 22 through the working medium phase change. The slot connecting piece refers to a tubular or slot-shaped structure connecting the first slot channels 211 of adjacent stator inner ends 112, and can be specifically a metal bellows or an injection-molded connecting channel. Its function is to achieve the circulation of the working medium between adjacent stator inner ends 112 and maintain the continuity of the heat dissipation structure.

[0055] The second evaporation part is the heat pipe 212 wound around the skeleton 12. The heat pipe 212 refers to a heat transfer element with a capillary structure, and specifically a copper powder sintered core heat pipe can be used. Its function is to quickly extract heat from the winding 13 area through the working medium evaporation-condensation phase change process.

[0056] The second slot channel 213 refers to interconnected slots provided inside the stator outer end 111, and can specifically be a cross network structure extending and distributed inside the stator outer end 111. Its function is to cool down the heat of the stator outer end 111 through vaporization of liquid working medium and dissipate 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 part) through the slot connecting piece. Only the two ends of the stator inner end 112 are connected to the external condensation device 22 through the evaporation condensation pipe 23, and the remaining stator inner ends 112 realize the flow of working medium through the internal slot network of the first slot channel 211. The heat pipe 212 around the skeleton 12 is wound on the inner ring side of the skeleton 12 and is physically isolated 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 slot, so that all stator outer ends 111 form an overall heat dissipation network (equivalent to the third evaporation part). To further explain, the specific heat dissipation principle of the heat dissipation structure is as follows: the liquid working medium flows from the condensing device 22 through the evaporation condensation tube 23 at one end and enters the first evaporation section arranged at the inner end 112 of the stator. At the same time, because each heat pipe 212 is connected to the first slot channel 211 and the second slot channel 213 respectively, the liquid working medium also flows through the second evaporation section arranged on the skeleton 12 (stator teeth 113) and the third evaporation section arranged at the outer end 111 of the stator. Because the evaporation sections are interconnected, the vaporized working medium finally flows back to the condensing device 22 through the evaporation condensation tube 23 at the other end and is liquefied.

[0058] Compared with existing technologies, existing heat dissipation structures typically use a single cooling channel or external heat sinks, which make it difficult to cover the entire stator area, resulting in a broken heat flow path and localized high temperatures. The present invention implements a fully integrated evaporation section on the stator unit 10. Specifically, a slot network is constructed at the stator inner end 112, non-interfering heat pipes 212 are arranged in the winding 13 (stator teeth 113) area, and interconnected slots are formed at the stator outer end 111. This interconnects the three, allowing heat from all parts of the stator unit 10 to be exchanged from the evaporation section 21 through the evaporative condenser tubes 23 and the condensing device 22, achieving multi-stage coordinated heat transfer.

[0059] Through the above technical solution, the present application solves the problem of local overheating caused by the discontinuity of the heat dissipation path between the spliced ​​stator monomers. The inner end of the stator forms a closed-loop flow through the slot connecting piece to avoid the retention of the working fluid; the heat pipe is separated from the winding space to ensure the feasibility of the winding operation; the slots at the outer end of the stator are interconnected to eliminate the heat dissipation blind spot of the splicing gap. The three-part evaporation part forms a composite working fluid flow path of "local parallel + overall series". This design not only ensures the uniform distribution of the liquid working fluid at the inner end 112 of the stator, but also 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 the heat pipe 212, forming a global flow of the working fluid, avoiding local working fluid drying or silting, 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 side surface of the stator inner end 112, and the other end of the stator tooth 113 is connected to the inner side surface of the stator outer end 111, and the horizontal cross-section of the stator core 11 is in the shape of an "I";

[0061] A first liquid inlet 1121 and a first liquid outlet 1122 are respectively provided on the left and right sides of the inner end 112 of the stator. A first circulating liquid exchange port 1123 is provided on the outer side of the inner end 112 of the stator. The first circulating 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 circulating liquid exchange port 1123 are respectively connected to the first tank channel 211.

[0062] The liquid inlet end of the evaporative condenser tube 23 is connected to the first liquid inlet 1121 of one stator inner end 112, and the liquid outlet end of the evaporative 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 end 112 is connected to the first liquid outlet 1122 of another adjacent stator inner end through the slot connecting piece.

[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 provides space for the distribution of the slot channels while ensuring the mechanical strength of the stator core 11. The first liquid inlet 1121 and the first liquid outlet 1122 are respectively arranged at the fluid inlet and outlet on the left and right sides of the stator inner end 112, and can be formed by drilling or casting processes, and are used to guide the liquid working medium into and out of the first slot channel 211. The first circulation liquid exchange port 1123 is a fluid exchange port located on the outer side of the stator inner end 112, and can be opened by milling, and is used to divert the working medium in the first slot channel 211 to the heat pipe 212. The slot connecting piece is used to connect the tubular parts of the first slot channels 211 of adjacent stator inner ends 112, for example, it is made of copper alloy or aluminum alloy material, and its length matches the splicing gap of the stator monomers to realize the transmission of the working medium between the stator monomers.

[0065] Specifically, the I-shaped cross-section enables the stator core 11 to form a stable support structure in the radial direction, and the network of the first slot channels 211 can be evenly distributed along the interior of the stator inner end 112. When the liquid working medium enters the first liquid inlet 1121 of a certain stator inner end 112 through the evaporation condensation tube 23, part of the working medium flows along the first slot channel 211 to the first liquid outlet 1122 and flows into the first liquid inlet 1121 of the adjacent stator inner end 112 through the slot connecting piece, and flows through the entire first evaporation section in sequence; another part of the working medium enters the heat pipe 212 through the first circulation liquid exchange port 1123 on the outer side of the stator inner end 112. In other words, the stator inner end 112 that is not directly connected to the evaporation condensation tube 23 realizes the series connection of the working medium between adjacent stator inner ends 112 through the slot connecting piece, and the connection between the first circulation liquid exchange port 1123 of each stator inner end 112 and the heat pipe 212 forms a plurality of parallel flow branches. This arrangement provides a radial heat dissipation path for the working fluid, in addition to the single circumferential flow of the motor stator. Spacing between the stator teeth 113 and the first circulation 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 cells 10 forms a distributed circulation channel network, avoiding the problem of reduced cooling efficiency in the distal stator portion that occurs in a single working fluid loop design.

[0066] Furthermore, the first slot channels 211 extend along the horizontal direction and / or vertical direction of the stator inner end 112 and are distributed inside the stator inner end 112 to form a continuous slot network.

[0067] The first slot channel 211 is extended in the horizontal and vertical directions to cover the length (horizontal) and height (vertical) directions of the inner end 112 of the stator as much as possible, thereby enhancing the flow capacity and coverage of the heat dissipation medium in the inner end 112 of the stator. The first slot channel network that is continuously connected refers to the slots extending in the horizontal and vertical directions that are interconnected to form an overall passage. Specifically, it can be achieved by connecting several horizontal slots and vertical slots through connecting sections, thereby improving the flow efficiency of the medium inside the first slot channel 211 by eliminating dead corners of flow. A three-dimensional flow path is formed by the first slot channel network that extends in the horizontal and vertical directions. It not only expands the heat dissipation area of ​​the first evaporation part, but also enhances the coverage capacity of the medium on various areas of the inner end 112 of the stator through the through design. As shown Figure 7 Shown is the distribution of the first slot channels within the interior of the stator inner end 112 according to 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 skeleton 12 of the annular structure refers to a supporting member with a closed annular cross-section, which can be specifically realized by injection-molding insulating materials, and its annular cavity provides installation space for the heat pipe arrangement. The winding 13 on the outer ring side refers to the coil wound and arranged along the outer peripheral surface of the skeleton 12, and can specifically be wound in layers using automated winding equipment. The annular groove on the outside of the skeleton 12 provides positioning support for the winding 13. The heat pipe 212 on the inner ring side refers to a metal heat transfer element arranged along the inner peripheral surface of the skeleton 12, and can specifically be formed by bending a copper capillary, and is fitted with the surface of the stator core 11 (stator teeth 113) through the guide groove inside the skeleton 12.

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

[0071] Traditional stator heat dissipation structures typically place heat dissipation pipes outside the windings or on the back of the core, resulting in the winding heat dissipation path being blocked by insulation. The present invention, through a partitioned design between the inner and outer ring sides of the skeleton 12, resolves the spatial conflict between the internal winding installation and the layout of the heat dissipation pipes within the stator unit. While ensuring the winding accuracy of the winding 13, the heat dissipation pipes can be closely 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 skeleton 12, avoiding the influence of the winding insulation layer on the heat dissipation efficiency and effectively reducing the temperature rise rate of the winding.

[0072] Furthermore, a second liquid inlet 1111 and a second liquid outlet 1112 are respectively provided on the left and right sides of the stator outer end 111, and a second circulation liquid exchange port 1113 is provided on the inner side of the stator outer end 111. The second circulation liquid exchange port 1113 does not interfere with the stator teeth 113, and 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 another 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 respectively provided at the left and right ends of the stator outer end 111, wherein the second liquid inlet 1111 of each stator outer end 111 is connected to the second liquid outlet 1112 of the adjacent stator outer end 111. When a plurality of stator outer ends 111 are spliced ​​and enclosed to form the outer ring of the motor stator 1, the second slot channels 213 inside each stator outer end 111 are connected to each other. The second circulation liquid exchange port 1113 is the interface for connecting the inner side surface of the stator outer end 111 with 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 side surface of the stator outer end 111 that is connected to the second slot channel 213, which is used to introduce the working medium in the heat pipe 212 into the internal heat dissipation structure of the stator outer end 111.

[0076] Specifically, the second slot channel 213 inside the stator outer end 111 forms a series loop with the second liquid outlet 1112 of the adjacent stator outer end 111 through the second liquid inlet 1111, so that the liquid working medium can flow through the second slot channels 213 of multiple stator outer ends 111 in sequence along the circumferential direction, forming a heat dissipation network that circumferentially circulates across the monomer. The second circulation liquid exchange port 1113 is arranged on the inner side of the stator outer end 111 and is connected to the end of the heat pipe 212, so that the working medium that absorbs the heat of the winding in the heat pipe 212 can be directly injected into the slot at the outer end of the stator for secondary heat dissipation. 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 is parallel or inclined to the extension direction of the stator teeth to ensure that there is no contact between the two.

[0077] Compared with the existing technology, the traditional motor stator heat dissipation structure usually adopts an independent cooling unit, and the heat dissipation flow channels of each stator monomer are isolated from each other, resulting in a limited flow path of the working fluid and an inability to effectively connect in series, which easily forms a local high-temperature zone. This solution directly connects the working fluid inlets and outlets (second liquid inlet and second liquid outlet) of the adjacent stator outer ends 111, constructing an axial and circumferential composite distributed heat dissipation network of the motor stator outer ring, significantly expanding the flow coverage range of the working fluid in the outer ring of the motor stator. Further combined with the first slot channel network of the inner ring of the motor stator and the heat pipe heat dissipation structure at the stator teeth, a heat dissipation structure of the multi-level evaporation part of the entire motor stator is formed.

[0078] Furthermore, the second slot channel 213 includes a plurality of horizontal slots 2131 and a vertical slot 2132. The horizontal slots 2131 horizontally pass through the left and right sides of the stator outer end 111. The slots at both ends of the horizontal slots 2131 are the second liquid inlet 1111 and the second liquid outlet 1112, respectively. The plurality of horizontal slots 2131 are arranged at intervals along the vertical direction. The vertical slots 2132 extend along the vertical direction of the stator outer end 111 and are arranged inside the stator outer end 111. The vertical slots 2132 are in communication with the plurality of horizontal slots 2131.

[0079] The plurality of second liquid inlets 1111 of one stator outer end 111 are connected to the plurality of second liquid outlets 1112 of another adjacent stator outer end 111 in a one-to-one correspondence.

[0080] The horizontal channel 2131 refers to a linear flow channel extending in the horizontal direction of the stator outer end 111 and passing through the left and right sides thereof. Specifically, it can be formed by machining or casting, and is used to establish a transverse cooling medium transmission channel between adjacent stator outer ends. Among them, the vertical channel 2132 refers to a longitudinal flow channel extending in the vertical direction of the stator outer end 111, which is used to connect multiple horizontal channels 2131 to form a three-dimensional network. Among them, the one-to-one connection between the second liquid inlet 1111 and the second liquid outlet 1112 refers to the ports of the horizontal channels 2131 of the adjacent stator outer ends 111 forming a continuously aligned fluid passage when spliced. Specifically, the interface size can be controlled by standardized processing tolerances to ensure the continuity of the channel network after splicing.

[0081] Specifically, a number of horizontal grooves 2131 are arranged at intervals along the vertical direction so that the cooling medium can flow laterally at different vertical positions, covering the heat dissipation requirements of different areas of the stator outer end 111. The vertical grooves 2132 penetrate longitudinally and cross-link with each horizontal groove 2131 to form a three-dimensional flow path, so that the medium can achieve coordinated flow of axial penetration and lateral diffusion inside the stator outer end 111. Adjacent stator outer ends 111 are seamlessly connected by the precisely aligned second liquid inlet 1111 and second liquid outlet 1112, avoiding fluid path interruption caused by assembly errors and ensuring that a complete outer ring circulation loop is formed after multiple stator monomers 10 are spliced. Figure 6 Shown is the distribution of the second slot channels inside the stator outer end 111 according to one embodiment.

[0082] A motor includes a motor stator 1, a heat dissipation structure and a motor rotor 3. The motor stator 1 is arranged 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 monomers 10. The heat dissipation structure is the above-mentioned heat dissipation structure.

[0083] The motor stator 1 is composed of multiple stator units 10 spliced ​​circumferentially to form a ring-shaped stator. Each stator unit 10 includes a stator core 11, a skeleton 12, and windings 13. The stator units 10 are connected by snaps or welding. The heat dissipation structure is a closed circuit consisting of an evaporator 21, a condenser 22, and an evaporator-condenser tube 23. The closed circuit is filled with a liquid working fluid, and heat is transferred by phase change of the working fluid. The evaporator 21 of the heat dissipation structure is arranged on the stator core 11 and skeleton 12.

[0084] Specifically, when the motor is running, the heat generated by the winding 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, the heat pipe 212 and the second slot channel 213 of the stator outer end 111 at the inner end 112 of the stator. After the liquid working fluid evaporates, it enters the evaporation condenser 23 along the evaporation part 21 and is transported to the external condensation device 22; second, the slots of adjacent stator monomers 10 form a continuous network through connecting parts, so that the heat is evenly diffused along the joints. After the condensing device cools the gaseous working fluid into liquid, it returns to the evaporation part through gravity, capillary action or an external pump to complete the cycle. This design enables the internal heat of the motor stator to be efficiently extracted through multiple paths, breaking through 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, which prevents them from creating an effective internal heat conduction path within a compact space. This solution, however, embeds the evaporation-condensation circuit within the stator itself, utilizing the stator's spliced ​​structure to naturally form a heat dissipation channel without requiring additional space. Furthermore, the integrated design of the heat pipe and the inner ring of the frame eliminates winding interference, allowing heat to be extracted directly from the heat source, eliminating the circuitous heat flow path problem found in traditional solutions.

[0086] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will 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 a plurality of stator monomers spliced ​​together, each of which 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 a stator outer end and a stator inner end. The stator outer end and the stator inner end are respectively arranged at the two ends of the stator teeth. The left and right sides of the plurality of stator outer ends are sequentially spliced ​​together to enclose the outer ring of the motor stator, and the plurality of stator inner ends are enclosed to form the inner ring of the motor stator. The heat dissipation structure includes an evaporation part, a condensation device and an evaporation condensation tube. The evaporation condensation tube connects the evaporation part and the condensation device to form a through circulation loop. The circulation loop is filled with liquid working medium. The evaporation part is respectively arranged at the stator inner end, stator teeth and stator outer end of several stator units. The condensation device and the evaporation condensation tube are arranged on the outside of the motor stator.

2. The heat dissipation structure of a motor stator according to claim 1, characterized in that: The evaporation portion includes a first evaporation portion, a second evaporation portion and a third evaporation portion; The first evaporation portion includes a plurality of first slot channels and a plurality of slot connecting pieces, wherein the first slot channels are provided 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 the other adjacent first slot channels at the inner end of the stator are connected through the slot connecting piece; The second evaporation part includes a plurality of groups of heat pipes, and the plurality of groups of heat pipes are respectively wound around a plurality of the skeletons, and the heat pipes and the windings do not interfere with each other; The third evaporation portion includes a plurality of second slot channels, wherein the second slot channels are provided inside the outer end of the stator, and adjacent second slot channels at the outer end of the stator are connected to each other; Both ends of the heat pipe are respectively communicated with a first slot channel and a second slot channel provided in the same stator core.

3. The heat dissipation structure of a motor stator according to claim 2, characterized in that: One end of the stator tooth is connected to the outer side surface of the inner end of the stator, and the other end of the stator tooth is connected to the inner side surface of the outer end of the stator, and the horizontal cross-section of the stator core is in the shape of an "I"; A first liquid inlet and a first liquid outlet are respectively provided on the left and right sides of the inner end of the stator, and a first circulation liquid exchange port is provided on the outer side surface of the inner end of the stator. The first circulation liquid exchange port does not interfere with the stator teeth, and the first liquid inlet, the first liquid outlet and the first circulation liquid exchange port are respectively connected to the first groove channel; The liquid inlet end of the evaporative condenser tube is connected to the first liquid inlet of one of the inner ends of the stator, the liquid outlet end of the evaporative condenser tube is connected to the first liquid outlet of another adjacent inner end of the stator, and the first liquid inlet of the other inner end of the stator is connected to the first liquid outlet of another adjacent inner end of the stator through the slot connecting piece; The first circulating liquid exchange port is communicated with one end of the heat pipe.

4. The heat dissipation structure of a motor stator according to claim 3, characterized in that: The first slot channels extend along the horizontal direction and / or vertical direction of the inner end of the stator and are distributed inside the inner end of the stator to form a continuous and through slot network.

5. The heat dissipation structure of a motor stator according to claim 3, characterized in that: The frame is an annular structure surrounding and covering the outside of the stator teeth. The winding is wound around the outer ring side of the frame, and the heat pipe is wound around the inner ring side of the frame.

6. The heat dissipation structure of a motor stator according to claim 5, characterized in that: 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 surface 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 groove channel; The second liquid inlet at the outer end of one stator is connected to the second liquid outlet at the outer end of another adjacent stator; The second circulating liquid exchange port is communicated with the other end of the heat pipe.

7. The heat dissipation structure of a motor stator according to claim 6, characterized in that: The second slot channel includes a plurality of horizontal slots and vertical slots, the horizontal slots horizontally passing through the left and right sides of the outer end of the stator, the slots at both ends of the horizontal slots are the second liquid inlet and the second liquid outlet respectively, the plurality of horizontal slots are arranged at intervals along the vertical direction, the vertical slots extend along the vertical direction of the outer end of the stator and are arranged inside the outer end of the stator, and the vertical slots are connected to the plurality of horizontal slots; The plurality of second liquid inlets at the outer end of one stator are connected in a one-to-one correspondence with the plurality of second liquid outlets at the outer end of another adjacent stator.

8. A motor comprising a motor stator, a heat dissipation structure, and a motor rotor, wherein the motor stator is arranged 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 a plurality of stator monomers spliced ​​together, and the heat dissipation structure is the heat dissipation structure according to any one of claims 1 to 7.

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