Frameless torque motor with heat dissipation structure

Abstract

The utility model discloses a frameless torque motor with heat dissipation structure, including stator subassembly and rotor subassembly, and stator subassembly is by a plurality of stator monomer splicing and is formed, and the stator monomer includes stator core, framework and winding, and winding is through the framework and is located in stator core, the outer tooth end and the inner tooth end of stator core are arranged at the both ends of stator tooth respectively, and stator subassembly is connected in turn and is enclosed by the outer tooth end of a plurality of stator monomer, and stator core is equipped with heat dissipation part, the outer tooth end is equipped with the ventilation structure of inside and outside through -going, and ventilation structure and stator tooth do not interfere with each other. By the stator subassembly is by a plurality of stator monomer splicing and is formed, effectively increases the heat dissipation surface area and establishes the heat conduction path, and the setting of stator core heat dissipation part, the overall cooperation of the ventilation structure of outer tooth end and stator monomer split type structure, significantly improves the heat conduction efficiency of stator subassembly, which maintains the compactness of structure, realizes the effective heat dissipation of high density winding, avoids the magnetic property degradation problem caused by heat accumulation.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a frameless torque motor with a heat dissipation structure. Background Technology

[0002] In the field of frameless torque motors, traditional design methods often result in poor heat dissipation. These traditional designs typically employ an integral stator structure, where the stator core, insulation material, and windings are tightly integrated together. The disadvantage of this design is that, due to the compact structure, heat is difficult to dissipate effectively, causing the motor to overheat under prolonged operation or high load conditions, affecting motor performance and lifespan.

[0003] Furthermore, in some traditional designs, the lack of an effective heat transfer medium between the stator core and windings causes heat to accumulate inside the motor and cannot be quickly transferred to the external environment. This design not only limits the motor's power density but may also cause the motor to trigger thermal protection under high loads, thereby reducing its operating efficiency.

[0004] In some cases, designers may add heat sinks or fans to the outside of the motor to improve heat dissipation. However, this method increases the size and weight of the motor, which is not conducive to miniaturization and weight reduction. At the same time, the addition of external heat dissipation devices also increases the manufacturing cost and maintenance difficulty of the motor.

[0005] In summary, traditional frameless torque motor designs have significant shortcomings in heat dissipation, which limits the improvement of motor performance and the expansion of its application range. Utility Model Content

[0006] In response to the problems raised in the background art, the purpose of this utility model is to propose a frameless torque motor with a heat dissipation structure, which solves the problem that traditional frameless torque motors have difficulty in effectively dissipating heat, thus affecting motor performance and lifespan.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A frameless torque motor with a heat dissipation structure includes a stator assembly and a rotor assembly. The stator assembly is located on the outer periphery of the rotor assembly. The stator assembly 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 core through the frame.

[0009] The stator core includes an outer tooth end, an inner tooth end, and stator teeth. The outer tooth end and the inner tooth end are respectively located at both ends of the stator teeth. The stator assembly is formed by sequentially connecting and surrounding the outer tooth ends of several stator units. The outer tooth end is located on the outside of the stator assembly, and the inner tooth end is located on the inside of the stator assembly. The stator core is provided with a heat dissipation part.

[0010] The external tooth end is provided with a ventilation structure that runs through both the inside and outside, and the ventilation structure does not interfere with the stator tooth.

[0011] Preferably, the heat dissipation part is a heat dissipation coating disposed on the outer side of the outer tooth end and the inner side of the inner tooth end, the heat dissipation coating comprising a graphene layer and an insulating layer, the insulating layer covering the surface of the graphene layer.

[0012] Preferably, the heat dissipation coating is in the form of a discontinuous grid or stripes.

[0013] Preferably, the heat dissipation part consists of a plurality of heat dissipation fins disposed on the outer side of the inner tooth end, the inner side of the outer tooth end, the outer side of the outer tooth end, and the surface of the stator tooth. The plurality of heat dissipation fins are distributed in a scale-like manner, and the heat dissipation fins do not interfere with the frame.

[0014] Preferably, the ventilation structure is a ventilation slot, which extends along the height direction of the outer tooth end. A blade is provided in the ventilation slot, one side of the blade is connected to one side of the ventilation slot, and the other side of the blade extends downward toward the other side of the ventilation slot. The angle between the blade and the plane of the ventilation slot is 30°-45°.

[0015] Preferably, a thermally conductive filler is used to fill the space between the stator core and the winding.

[0016] Preferably, the thermally conductive filler is thermally conductive silicone or epoxy resin.

[0017] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0018] By assembling the stator assembly from several independent stator units to form a modular structure design, the heat dissipation surface area is effectively increased and a discrete heat conduction path is established. The design of the heat dissipation section of the stator core, the ventilation structure of the outer ring of the stator core, and the overall coordination with the split structure break the heat accumulation effect of the traditional integral stator and significantly improve the thermal conductivity of the stator assembly. This achieves effective heat dissipation of the high-density windings while maintaining structural compactness, avoiding the problem of magnetic performance degradation caused by heat accumulation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one embodiment of the present invention;

[0020] Figure 2 This is a top view of one embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of one embodiment of the single-piece iron core of this utility model;

[0022] Figure 4 This is a schematic diagram of another embodiment of the single-piece iron core of this utility model;

[0023] Figure 5 This is a schematic diagram of the horizontal cross-section of the ventilation structure of this utility model.

[0024] Among them: stator assembly 1, stator unit 10, stator core 11, external tooth end 111, internal tooth end 112, stator tooth 113, frame 12, winding 13, rotor assembly 2, heat dissipation part 3, heat dissipation coating 31, heat dissipation fin 32, ventilation structure 4, ventilation slot 41, blade 42 and thermally conductive filler 5. Detailed Implementation

[0025] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, 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 utility model 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 utility model.

[0027] 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.

[0028] 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The following is in conjunction with the appendix Figures 1 to 5 The technical solution of this utility model will be further illustrated through specific implementation methods.

[0030] A frameless torque motor with a heat dissipation structure includes a stator assembly 1 and a rotor assembly 2. The stator assembly 1 is located on the outer periphery of the rotor assembly 2. The stator assembly 1 is composed of a plurality of 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 core 11 through the frame 12.

[0031] The stator core 11 includes an outer tooth end 111, an inner tooth end 112, and a stator tooth 113. The outer tooth end 111 and the inner tooth end 112 are respectively located at both ends of the stator tooth 113. The stator assembly 1 is formed by sequentially connecting and surrounding the outer tooth ends 111 of a plurality of stator units 10. The outer tooth end 111 is located on the outside of the stator assembly 1, and the inner tooth end 112 is located on the inside of the stator assembly 1. The stator core 11 is provided with a heat dissipation part 3.

[0032] The external tooth end 111 is provided with a ventilation structure 4 that runs through the inside and outside, and the ventilation structure 4 does not interfere with the stator tooth 113.

[0033] By designing the stator assembly 1 as a composite of multiple independent stator units 10, each stator unit 10 includes an independent stator core 11, frame 12, and winding 13. These components, when assembled into a stator unit 10, form a modular gap structure, effectively increasing the heat dissipation surface area and establishing discrete heat conduction paths. This stator unit 10 composite structure breaks away from the traditional closed heat accumulation mode of integral stators. This structure reduces the operating temperature rise of the winding 12, effectively solving the heat conduction obstruction problem caused by the insulation material encasing the stator in traditional designs.

[0034] The outer tooth end 111 and the inner tooth end 112 are respectively located at both ends of the stator tooth 113. The outer ring of the stator assembly 1 is formed by sequentially splicing together the outer tooth ends 111 of several stator iron cores 11. The inner tooth ends 112 of several stator iron cores 11 are not connected to each other, so that the inner tooth ends 112 form a discontinuous inner ring of the stator assembly 1. The gaps between the inner tooth ends 112 and between the inner tooth ends 112 and the rotor assembly 2 can form a chimney effect, which can further utilize the gaps of the split structure of the stator unit 10 to form a multi-directional heat conduction path. Compared with the traditional integral stator heat dissipation channel and heat dissipation area, it increases the heat flux density peak and effectively reduces the heat dissipation efficiency under natural convection.

[0035] To further enhance heat dissipation, a heat sink 3 is integrated into the stator core 11. Unlike traditional motors that only use fans in the casing for cooling, this frameless motor, designed for miniaturization, does not have a separate casing. Therefore, a heat sink 3 is integrated into the stator (stator core 11). The directional heat conduction and efficient heat dissipation design of the heat sink 3 creates a highly efficient heat conduction network within the stator core 11, reducing thermal resistance compared to traditional cores. Combined with the natural convection channels formed by the modular splicing gaps of the stator assembly 1, a direct path for heat to flow from the windings to the external environment of the motor is achieved. Furthermore, the ventilation structure 4 at the external tooth end 111, while maintaining the mechanical strength of the stator core, utilizes a through-flow channel design to create forced convection during motor operation through rotor rotation disturbance. This structure increases internal airflow velocity and improves the convective heat transfer coefficient, resulting in a 20% improvement in energy efficiency compared to traditional external fan solutions. The heat conduction path dominated by the heat dissipation section 3 complements the convection path of the ventilation structure 4. Under light load, it relies on natural convection, while under high load, forced convection is automatically enhanced, achieving dynamic thermal management and improving efficiency compared to the traditional single heat dissipation mode.

[0036] This invention forms a modular structure by splicing together several independent stator units 10 to create the stator assembly 1, which effectively increases the heat dissipation surface area and establishes discrete heat conduction paths. The overall coordination of the heat dissipation part 3 of the stator core, the ventilation structure 4 of the outer ring (outer tooth end 111) of the stator core 11, and the split structure breaks the heat accumulation effect of the traditional integral stator and significantly improves the thermal conductivity of the stator assembly. This achieves effective heat dissipation of the high-density winding while maintaining the compactness of the structure, avoiding the problem of magnetic performance degradation caused by heat accumulation.

[0037] Furthermore, the heat dissipation part 3 is a heat dissipation coating 31 disposed on the outer side of the outer tooth end 111 and the inner side of the inner tooth end 112. The heat dissipation coating 31 includes a graphene layer and an insulating layer, and the insulating layer covers the surface of the graphene layer.

[0038] A heat dissipation coating 31 is formed on the outer side of the outer tooth end 111 and the inner side of the inner tooth end 112 of the stator core 11, creating a double-sided heat diffusion interface. The heat dissipation coating 31 on the outer tooth end 111 is exposed to the outermost part of the motor, radiating heat from the stator core 11 outwards and effectively participating in convective heat transfer. The heat dissipation coating 31 on the inner tooth end 112 is close to the gap of the rotor assembly 2, utilizing the airflow generated by the rotational disturbance of the rotor assembly 2 for forced convective heat dissipation, thereby enhancing thermal convection and forming a "coordinated heat dissipation domain." It is worth noting that the outer side of the stator core 11 refers to the side facing the rotor assembly, while the inner side of the stator core 11 is the side facing away from the rotor assembly 1. In other words, the outer side of the outer tooth end 111 is the side away from the stator teeth 113, and the inner side of the inner tooth end 112 is also the side away from the stator teeth 113. The heat dissipation coating 31 avoids the area of ​​the stator teeth 113 as much as possible to prevent the heat dissipation coating 31 from generating magnetic field interference on the windings, causing local saturation or eddy current concentration.

[0039] The heat dissipation coating 31 includes a graphene layer and an insulating layer. The graphene layer has the characteristic of rapid thermal diffusion; the insulating layer covers the surface of the graphene layer, which can block the negative impact of the graphene layer on electromagnetic induction, thereby blocking the conductive path. The heat dissipation coating 31, through the rapid heat dissipation characteristics of the graphene layer and the dielectric properties of the insulating layer, reduces the iron loss of the motor under high-frequency operating conditions, while also reducing electromagnetic interference to surrounding devices.

[0040] Preferably, the insulating layer is made of materials such as polyimide or alumina ceramic coating; insulating particles such as boron nitride (BN) and alumina (Al2O3) can be mixed into the graphene coating material to reduce the overall conductivity.

[0041] Furthermore, the heat dissipation coating 31 is in the form of a discontinuous grid or stripes.

[0042] The discontinuous grid or stripe structure of the heat dissipation coating 31 can effectively block the formation of conductive loops and prevent the coating from generating closed eddy current loops in an alternating magnetic field. By further blocking eddy current paths, optimizing heat flux distribution, and adapting to complex structures, eddy current losses are reduced to negligible levels, avoiding efficiency losses. In addition, this solution balances process cost and reliability, making it suitable for mass production.

[0043] Furthermore, the heat dissipation part 3 consists of a plurality of heat dissipation fins 32 disposed on the outer side of the inner tooth end 112, the inner side of the outer tooth end 111, the outer side of the outer tooth end 111, and the surface of the stator tooth 113. The plurality of heat dissipation fins 32 are distributed in a scale-like manner, and the heat dissipation fins 32 do not interfere with the frame 12.

[0044] The design of several heat sinks 32 in a scale-like distribution, and their arrangement on the outer side of the inner tooth end 112, the inner and outer sides of the outer tooth end 111, and the surface of the stator teeth 113, helps to enhance the convective heat dissipation of the stator core 11. The gaps formed between adjacent heat sinks 32 disrupt the laminar boundary layer, induce airflow turbulence, and further increase the heat dissipation efficiency.

[0045] Furthermore, the ventilation structure 4 is a ventilation groove 41, which extends along the height direction of the external tooth end 111. A blade 42 is provided in the ventilation groove 41. One side of the blade 42 is connected to one side of the ventilation groove 41, and the other side of the blade 42 extends downward toward the other side of the ventilation groove 41. The angle between the blade 42 and the plane of the ventilation groove 41 is 30°-45°.

[0046] The ventilation structure 4 consists of guide blades 42 installed within the ventilation slots 41. The fan blades 411 extend downwards at an angle of 30°-45°, forcing the airflow to be discharged outwards, closely adhering to the outer surface of the blades 411 and the stator assembly 1 as it passes through the ventilation slots 41. The airflow discharged from the ventilation slots 41 of each stator unit 10 forms a spiral flow on the outer surface of the stator assembly 1, significantly increasing the contact between the airflow and the surface of the heat dissipation section 3 and the turbulence intensity, thereby improving the convective heat transfer effect and effectively reducing the stator temperature rise. It is worth noting that the tilt angle of the blades 42 matches the rotation direction of the motor (rotor assembly 2), utilizing centrifugal force to collaboratively accelerate the airflow outwards, ensuring stable heat dissipation performance under high-speed operating conditions.

[0047] Preferably, the blade 42 is integrally formed with the sidewall of the ventilation slot 41, serving as an internal reinforcing rib to enhance the lateral stiffness of the slot, reduce vibration deformation, and suppress broadband noise caused by airflow separation. Furthermore, the surface of the blade is curved, with the curve protruding outwards from the stator assembly 1.

[0048] Furthermore, the ventilation structure 4 can also be a series of ventilation holes arranged in an array. The ventilation holes are beneficial for heat dissipation and reduce the weight of the stator core 11, thereby further reducing the overall weight of the motor.

[0049] Furthermore, a thermally conductive filler 5 is filled between the stator core 11 and the winding 13.

[0050] By filling the space between the stator core 11 and the winding 13 with thermally conductive filler 5, the filler 5 tightly fills the gap between the stator core 11 and the winding 13, eliminating the contact thermal resistance caused by air gaps. This allows the heat generated by the winding 13 to be directly conducted to the stator core 11 through the thermally conductive filler 5, helping to reduce overall thermal resistance and significantly improve heat dissipation efficiency. The high thermal conductivity of the thermally conductive filler 5 promotes rapid heat diffusion along the axial and circumferential directions of the winding 13, reducing the temperature difference between the stator teeth 113 and the winding 13, and preventing frame aging caused by local overheating. Furthermore, after the thermally conductive filler 5 solidifies, it forms a dense support layer, suppressing the displacement of the winding 13 caused by electromagnetic force or vibration, reducing the amplitude of mechanical vibration, extending the life of various structural components, and improving the reliability of motor operation.

[0051] Furthermore, the thermally conductive filler 5 is thermally conductive silicone or epoxy resin.

[0052] The thermally conductive filler 5 is made of materials with high thermal conductivity, such as thermally conductive silicone or epoxy, which effectively reduces the contact thermal resistance between the stator core 11 and the winding 13, significantly improving heat transfer efficiency and enhancing the overall heat dissipation performance of the motor. Simultaneously, the thermally conductive silicone or epoxy possesses excellent electrical insulation properties, ensuring reliable insulation between the winding 13 and the stator core 11 while enhancing heat dissipation, thus preventing leakage or short circuit risks. The thermally conductive silicone or epoxy material can operate stably within a temperature range of -40℃ to 200℃, exhibits excellent heat aging resistance, and maintains high thermal conductivity and mechanical strength even after long-term use, making it suitable for motor applications in high power density or harsh conditions.

[0053] In addition, thermally conductive silicone or epoxy resin has good flowability and filling properties, and can be uniformly filled into the complex slot structure inside the stator unit 10 through injection, potting or vacuum impregnation processes, ensuring the tight fit between the winding 13 and the stator core 11, improving manufacturing efficiency and reducing process costs.

[0054] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A frameless torque motor with a heat dissipation structure, comprising a stator assembly and a rotor assembly, wherein the stator assembly is located on the outer periphery of the rotor assembly, characterized in that: The stator assembly 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 core through the frame. The stator core includes an outer tooth end, an inner tooth end, and stator teeth. The outer tooth end and the inner tooth end are respectively located at both ends of the stator teeth. The stator assembly is formed by sequentially connecting and surrounding the outer tooth ends of several stator units. The outer tooth end is located on the outside of the stator assembly, and the inner tooth end is located on the inside of the stator assembly. The stator core is provided with a heat dissipation part. The external tooth end is provided with a ventilation structure that runs through both the inside and outside, and the ventilation structure does not interfere with the stator tooth.

2. The frameless torque motor with a heat dissipation structure according to claim 1, characterized in that: The heat dissipation part is a heat dissipation coating disposed on the outer side of the outer tooth end and the inner side of the inner tooth end. The heat dissipation coating includes a graphene layer and an insulating layer, and the insulating layer covers the surface of the graphene layer.

3. A frameless torque motor with a heat dissipation structure according to claim 2, characterized in that: The heat dissipation coating is in the form of a discontinuous grid or stripes.

4. A frameless torque motor with a heat dissipation structure according to claim 1, characterized in that: The heat dissipation part consists of a plurality of heat dissipation fins disposed on the outer side of the inner tooth end, the inner side of the outer tooth end, the outer side of the outer tooth end, and the surface of the stator tooth. The plurality of heat dissipation fins are distributed in a scale-like manner, and the heat dissipation fins do not interfere with the frame.

5. A frameless torque motor with a heat dissipation structure according to any one of claims 1-4, characterized in that: The ventilation structure is a ventilation slot, which extends along the height direction of the outer tooth end. A blade is provided in the ventilation slot, one side of which is connected to one side of the ventilation slot, and the other side of which extends downward toward the other side of the ventilation slot. The angle between the blade and the plane of the ventilation slot is 30°-45°.

6. A frameless torque motor with a heat dissipation structure according to claim 5, characterized in that: The space between the stator core and the winding is filled with a thermally conductive filler.

7. A frameless torque motor with a heat dissipation structure according to claim 6, characterized in that: The thermally conductive filler is thermally conductive silicone or epoxy resin.

Images