A hollow cup motor rotor frame

Abstract

This utility model discloses a hollow cup motor rotor frame, relating to the technical field of rotor frame technology. It includes an insulating positioning seat, with end rings for power transmission fixedly installed at both ends of the hollow cup winding. The insulating positioning seat has heat dissipation grooves for heat transfer inside, and an insulating frame for shaping and support is fixedly installed inside the heat dissipation grooves. The advantages of this utility model are: the insulating positioning seat of the hollow cup motor rotor frame has heat dissipation grooves communicating with the interior of the hollow cup motor, and a heat-conducting block made of thermally conductive material is set inside the end rings, allowing the heat-conducting block to be in close contact with the interior of the hollow cup motor. The heat generated by the hollow cup motor windings can be conducted to the outside of the motor through the heat-conducting block. Simultaneously, the heat dissipation cavity inside the heat-conducting block increases the heat conduction area, and the cooling air duct accelerates the start-stop airflow around the heat-conducting block, further improving the heat conduction and heat dissipation efficiency of the heat-conducting block and facilitating heat dissipation of the rotor frame.

Description

Technical Field

[0001] This utility model relates to the field of rotor frame technology, and in particular to a hollow cup motor rotor frame. Background Technology

[0002] Coreless motors are DC, permanent magnet, servo micro motors. They possess outstanding energy-saving characteristics, sensitive and convenient control, and stable operation. As a high-efficiency energy conversion device, they represent the future direction of electric motor development. Structurally, coreless motors break through the traditional rotor structure by employing a coreless rotor. In the field of coreless motors, the rotor frame, as a key component, plays a crucial role in the motor's performance. With continuous technological advancements, various electronic devices are placing increasingly stringent requirements on coreless motors in terms of size, weight, efficiency, and stability, leading to increasingly stringent requirements for the coreless motor rotor frame.

[0003] However, the existing hollow cup motor rotor frame is usually a closed structure, which is not conducive to heat dissipation. When the motor runs for a long time, the heat generated by the winding cannot be quickly conducted, which can easily lead to aging of the frame material and is not conducive to the stable operation of the motor. Utility Model Content

[0004] Therefore, the purpose of this utility model is to propose a hollow cup motor rotor frame to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, one embodiment of this utility model provides a hollow cup motor rotor frame, comprising a hollow cup winding formed by winding a hollow cylindrical coil with high-strength enameled wire (such as copper wire), an insulating positioning seat fixedly installed at one end of the hollow cup winding for positioning and protection, and end rings for power transmission fixedly installed at both ends of the hollow cup winding, a heat dissipation groove for heat transfer being provided inside the insulating positioning seat, an insulating frame for shaping and support being fixedly installed inside the heat dissipation groove, a heat-conducting block penetrating the end ring being provided on one side of the heat dissipation groove, a heat dissipation cavity for heat dissipation being provided inside the heat dissipation cavity, a reinforcing frame for supporting and fixing the heat-conducting block being provided inside the heat dissipation cavity, a cooling air duct surrounding the heat-conducting block being provided inside the end ring, and air guide slots for guiding airflow being provided at both ends of the cooling air duct.

[0006] Preferably, in any of the above embodiments, the insulating positioning seat is located on one side of the end ring, and a rotor shaft is fixedly installed in the middle of the end ring, with the rotor shaft and the insulating positioning seat being fixedly installed.

[0007] The above technical solution employs an insulating positioning seat (made of polyimide, with overall dimensions adapted to one end of the hollow cup winding), located on the side of the end ring near the winding. It is fixed to the inner wall of the hollow cup winding using hot melt adhesive. Its core function is to provide axial positioning and radial support for the hollow cup winding. Through interference fit and hot melt adhesive, it prevents radial offset or axial movement of the winding during high-speed rotor rotation. The high insulation of polyimide blocks current flow between the winding and the end ring, ensuring motor safety. The end ring (with a rotor shaft mounting hole in the center) and the rotor shaft (interference fit with the mounting hole) are fixed to the center of the end ring by pressure assembly and have a clearance fit with the center hole of the insulating positioning seat. Its core function is to transmit rotor power and position the insulating positioning seat. The rotor shaft forms a rigid connection with the end ring through the interference fit, ensuring efficient power transmission from the motor. The clearance fit with the insulating positioning seat provides radial guidance, preventing shaft jamming caused by winding deformation.

[0008] Preferably, in any of the above embodiments, the heat dissipation groove is located inside the hollow cup winding, and a connecting groove for fixing the heat-conducting block is provided inside the end ring. The position of the connecting groove corresponds to the position of the heat dissipation groove, and the size of the connecting groove is larger than the size of the heat dissipation groove.

[0009] The above technical solution employs the following: Heat dissipation grooves (located inside the insulating positioning seat, penetrating the thickness of the positioning seat and evenly distributed along its circumference) are situated on the inner side of the hollow cup winding (groove openings facing the inner wall of the winding). Their core function is to construct a heat conduction channel for the winding. The grooves increase the contact area between the positioning seat and the winding, while simultaneously creating airflow gaps to accelerate heat transfer from the winding to the positioning seat, preventing localized overheating of the winding. Connecting grooves inside the end ring (penetrating the thickness of the end ring, with positions corresponding to the heat dissipation grooves, and larger in size) are used to fix the heat-conducting block. Their core function is to provide installation space and a positioning reference for the heat-conducting block. The corresponding positions of the connecting grooves and the heat dissipation grooves ensure that the heat-conducting block simultaneously adheres to both the heat dissipation groove and the end ring, forming a complete heat dissipation path of "winding-heat dissipation groove-heat-conducting block-end ring." The size design (larger than the heat dissipation groove) allows for installation errors in the heat-conducting block, preventing structural damage caused by hard contact.

[0010] Preferably, in any of the above embodiments, the insulating skeleton comprises a shaped bracket made of phenolic resin glass cloth tube and an insulating sleeve made of polyether ether ketone (PEEK) film. The shaped bracket is configured as a "U"-shaped structure, and the insulating sleeve is fitted onto the surface of the shaped bracket. The insulating sleeve and the perimeter of the heat dissipation groove are fixed by hot melt bonding.

[0011] The above technical solution employs a shaped support for the insulating frame (phenolic resin glass cloth tube, "U"-shaped structure), embedded within the heat dissipation groove along its length. Its core function is to support the heat dissipation groove structure. The rigid "U"-shaped structure prevents the groove from collapsing due to winding pressure or centrifugal force, while maintaining airflow clearance within the groove to ensure unobstructed heat dissipation. The insulating sleeve on the surface of the shaped support is fixed to the perimeter of the heat dissipation groove via hot-melt bonding. Its core function is to enhance insulation protection. The high insulation properties of the PEEK film block current flow between the heat dissipation groove and the windings, while its temperature resistance ensures no aging under long-term high-temperature conditions, preventing motor failure due to insulation failure.

[0012] Preferably, in any of the above embodiments, the heat-conducting block is made of a heat-conducting material with an insulating layer, one end face of the heat-conducting block is flush with the inner end face of the end ring, and the other end face of the heat-conducting block is flush with the outer end face of the end ring.

[0013] The above technical solution is adopted: the heat-conducting block (made of ceramic material, with an aluminum oxide insulating layer sprayed on the surface, the size of which is adapted to the end ring connecting groove, and the end faces of both ends are flush with the inner and outer end faces of the end ring) is fixed in the connecting groove with thermally conductive adhesive, and at the same time fits the groove wall of the heat dissipation groove. Its core function is to efficiently conduct heat and provide insulation. Its function is to quickly conduct the heat transferred from the heat dissipation groove to the end ring through the high thermal conductivity of ceramic. At the same time, the surface insulating layer blocks the current conduction between the heat-conducting block and the winding and end ring, avoiding the risk of short circuit.

[0014] Preferably, in any of the above embodiments, the reinforcing frame includes a supporting frame made of phenolic resin glass cloth tube and reinforcing rods for supporting and reinforcing it. The supporting frame is fixedly installed on the periphery of the supporting frame and the inner wall of the heat dissipation cavity. The reinforcing rods are fixedly installed in a cross-shaped pattern inside the supporting frame.

[0015] The above technical solution is adopted as follows: The supporting frame of the reinforced frame (phenolic resin glass cloth tube, the size of which is adapted to the heat dissipation cavity) is fixed to the inner wall of the heat dissipation cavity by thermally conductive adhesive (same as the adhesive for the heat dissipation block). Its core function is to support the cavity structure of the heat dissipation block. Its function is to prevent the heat dissipation block from losing structural strength due to the opening of the heat dissipation cavity by using the rigidity of the frame, and to prevent the heat dissipation block from breaking due to centrifugal force when the motor rotates. The core function of the reinforcing rod inside the supporting frame (welded and fixed inside the frame) is to further strengthen the frame structure. Its function is to form an "X"-shaped support by cross distribution, disperse the centrifugal force borne by the heat dissipation block, and at the same time, not block the air flow of the heat dissipation cavity, so as to ensure that the heat dissipation function of the cavity is not affected.

[0016] Preferably, in any of the above embodiments, the cooling air duct includes an inner ring air duct and an outer ring air duct. The inner ring air duct is located on the side of the heat-conducting block closer to the rotor shaft, and the outer ring air duct is located on the side of the heat-conducting block farther from the rotor shaft. The diameter of the outer ring air duct is larger than the diameter of the inner ring air duct. The air guide slot is opened inside the end ring, and an air guide plate fixedly connected to the end ring is provided on one side of the air guide slot.

[0017] The above technical solution employs an inner ring cooling duct (located inside the end ring, evenly distributed along the circumference of the end ring, on the side of the heat-conducting block closest to the rotor shaft) and an outer ring cooling duct (the same number as the inner ring, located on the side of the heat-conducting block furthest from the rotor shaft, with a diameter larger than the inner ring cooling duct). Their core function is to construct an end ring airflow cooling channel. The inner ring's small-diameter duct accelerates air convection inside the heat-conducting block, while the outer ring's large-diameter duct accelerates air convection outside, forming a "dual-channel" cooling system. Simultaneously, the ducts are distributed around the heat-conducting block, ensuring uniform airflow around it. The air guide slots (located inside the end ring at both ends of the cooling duct (inlet and outlet), with the same number as the ducts, and one side's guide vane welded to the end ring, with an angle of inclination equal to the end ring's tangent) primarily function to guide airflow direction. Their function is to guide the centrifugal airflow generated by the motor's rotation into the cooling duct through the angle of the guide vane, preventing airflow turbulence. The trapezoidal slots increase the inlet / outlet area and reduce airflow resistance.

[0018] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0019] 1. A heat dissipation groove communicating with the interior of the hollow cup motor rotor frame is provided inside the insulating positioning seat. A heat-conducting block made of thermally conductive material is set inside the end ring, so that the heat-conducting block is connected and in close contact with the interior of the hollow cup motor. The heat generated by the hollow cup motor winding can be conducted to the outside of the motor through the heat-conducting block. At the same time, the heat dissipation cavity inside the heat-conducting block increases the heat conduction area, and the cooling air duct accelerates the start-stop circulation around the heat-conducting block, further improving the heat conduction and heat dissipation efficiency of the heat-conducting block. This facilitates heat dissipation of the rotor frame and helps to improve the working stability of the rotor frame.

[0020] 2. An insulating frame and a reinforcing frame are installed inside the heat dissipation slots and cavities to support and fix them. While expanding the heat dissipation area, the strength and stability of the insulating positioning seat and heat-conducting block structure are ensured, the overall structural strength of the rotor frame is guaranteed, and the stability of motor operation is guaranteed.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the structure according to an embodiment of the present utility model;

[0024] Figure 2 This is a partial structural schematic diagram according to an embodiment of the present utility model;

[0025] Figure 3 This is a cross-sectional structural diagram of the insulating positioning seat according to an embodiment of the present utility model;

[0026] Figure 4 This is a cross-sectional structural diagram of the end ring according to an embodiment of the present utility model;

[0027] Figure 5 This is a cross-sectional structural diagram of the insulating frame according to an embodiment of the present utility model;

[0028] Figure 6 This is a cross-sectional structural diagram of the air guide slot according to an embodiment of the present utility model;

[0029] Among them: 1-hollow cup winding, 2-insulating positioning seat, 3-end ring, 4-heat dissipation groove, 5-insulating skeleton, 51-shaping bracket, 52-insulating sleeve, 6-heat conducting block, 7-heat dissipation cavity, 8-reinforcing frame, 81-support frame, 82-reinforcing rod, 9-cooling air duct, 91-inner ring air duct, 92-outer ring air duct, 10-air guide slot, 11-air guide plate. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0031] like Figure 1-6 As shown, a hollow cup motor rotor frame according to an embodiment of the present invention includes a hollow cup winding 1, which is wound into a hollow cylindrical coil using high-strength enameled wire (such as copper wire). An insulating positioning seat 2 is fixedly installed at one end of the hollow cup winding 1 for positioning and protection. End rings 3 for power transmission are fixedly installed at both ends of the hollow cup winding 1. A heat dissipation groove 4 for heat transfer is opened inside the insulating positioning seat 2. An insulating frame 5 for shaping and support is fixedly installed inside the heat dissipation groove 4. A heat-conducting block 6 is provided on one side of the heat dissipation groove 4, which passes through the end ring 3. A heat dissipation cavity 7 for heat dissipation is opened inside the heat dissipation cavity 7. A reinforcing frame 8 for supporting and fixing the heat-conducting block 6 is provided inside the heat dissipation cavity 7. A cooling air duct 9 is opened inside the end ring 3, which surrounds the heat-conducting block 6. Air guide slots 10 for guiding airflow are provided at both ends of the cooling air duct 9.

[0032] Preferably, in any of the above schemes, the insulating positioning seat 2 is located on one side of the end ring 3, and the rotor shaft is fixedly installed in the middle of the end ring 3, with the rotor shaft and the insulating positioning seat 2 being fixedly installed.

[0033] The above technical solution is adopted: the insulating positioning seat 2 (made of polyimide, with an overall size adapted to one end of the hollow cup winding 1) is located on the side of the end ring 3 near the winding, and is fixed to the inner wall of the hollow cup winding 1 by hot melt adhesive. Its core function is to provide axial positioning and radial support for the hollow cup winding. Its function is to prevent radial offset or axial movement of the winding when the rotor rotates at high speed through the double fixation of interference fit and hot melt adhesive. The high insulation of polyimide blocks the current conduction between the winding and the end ring 3, ensuring the safety of the motor. The end ring 3 (with a rotor shaft mounting hole in the middle) and the rotor shaft (with interference fit with the mounting hole) are fixed to the middle of the end ring by pressure assembly, and have a clearance fit with the center hole of the insulating positioning seat 2. Its core function is to transmit rotor power and position the insulating positioning seat. Its function is to form a rigid connection between the rotor shaft and the end ring through interference fit, ensuring efficient transmission of motor power. The clearance fit with the insulating positioning seat provides radial guidance for the positioning seat, preventing shaft jamming caused by the deformation of the positioning seat with the winding.

[0034] Operating principle: During assembly, the insulating positioning seat is first heat-fused to the hollow cup winding, then the end ring is welded to both ends of the winding, and finally the rotor shaft is pressed into the end ring mounting hole to ensure that the shaft and end ring are coaxial. When the motor is running, the rotor shaft drives the end ring and winding to rotate synchronously. The insulating positioning seat maintains the winding shape and avoids the winding from loosening due to centrifugal force. Through the matching precision of the mechanical structure and the material properties, power-free positioning and power transmission are achieved, and it can be adapted to high-speed rotation scenarios without additional adjustment.

[0035] Preferably, in any of the above schemes, the heat dissipation groove 4 is located inside the hollow cup winding 1, and the end ring 3 has a connecting groove for fixing the heat conduction block 6. The position of the connecting groove corresponds to the position of the heat dissipation groove 4, and the size of the connecting groove is larger than the size of the heat dissipation groove 4.

[0036] The above technical solution is adopted as follows: The heat dissipation groove 4 (opened inside the insulating positioning seat 2, penetrating the thickness of the positioning seat, and evenly distributed along the circumference of the positioning seat) is located on the inner side of the hollow cup winding 1 (the groove opening faces the inner wall of the winding). Its core function is to construct a heat conduction channel for the winding. Its function is to increase the contact area between the positioning seat and the winding by the groove body, and at the same time form an air flow gap to accelerate the transfer of heat from the winding to the positioning seat and avoid local overheating of the winding. The connecting groove inside the end ring 3 (penetrating the thickness of the end ring, with a position corresponding to the heat dissipation groove 4, and a size larger than the heat dissipation groove) is used to fix the heat conduction block 6. Its core function is to provide installation space and positioning reference for the heat conduction block. Its function is to ensure that the heat conduction block 6 fits the heat dissipation groove and the end ring at the same time by the corresponding position of the connecting groove and the heat dissipation groove, forming a complete heat dissipation path of "winding-heat dissipation groove-heat conduction block-end ring". The size design (larger than the heat dissipation groove) allows for the installation error of the heat conduction block and avoids structural damage caused by hard contact.

[0037] Operating principle: When the hollow cup winding 1 is working, the Joule heat generated is partially dissipated through natural convection via the air gap of the heat dissipation slot 4, and the other part is transferred through the slot wall to the insulating positioning seat, and then conducted to the heat conduction block 6. The connecting slot ensures that the heat conduction block and the heat dissipation slot are precisely connected, with no blind spots in heat conduction. During operation: After the motor starts, the winding temperature gradually rises, and the heat is quickly transferred through the heat dissipation slot; the heat conduction block in the connecting slot further conducts the heat to the end ring, and the end ring diffuses to the outside through its own metal properties. After the machine stops, the air circulation between the heat dissipation slot and the connecting slot accelerates the cooling of the winding. By matching the number and distribution of the heat dissipation slots and the size of the connecting slot, uniform heat conduction and structural adaptation are achieved, and heat dissipation efficiency can be improved without additional heat dissipation components.

[0038] Preferably, in any of the above embodiments, the insulating frame 5 includes a shaping bracket 51 made of phenolic resin glass cloth tube and an insulating sleeve 52 made of polyether ether ketone (PEEK) film. The shaping bracket 51 is configured as a "U" shaped structure, and the insulating sleeve 52 is fitted onto the surface of the shaping bracket 51. The insulating sleeve 52 and the periphery of the heat dissipation groove 4 are fixed by hot melt bonding.

[0039] The above technical solution employs the following: The shaped bracket 51 of the insulating skeleton 5 (phenolic resin glass cloth tube, "U"-shaped structure) is embedded in the heat dissipation groove 4 along its length. Its core function is to support the heat dissipation groove structure. The rigid "U"-shaped structure prevents the heat dissipation groove from collapsing due to winding pressure or centrifugal force, while maintaining airflow clearance within the groove to ensure unobstructed heat dissipation. The insulating sleeve 52 on the surface of the shaped bracket 51 is fixed to the perimeter of the heat dissipation groove 4 via hot-melt bonding. Its core function is to enhance insulation protection. The high insulation properties of the PEEK film block current flow between the heat dissipation groove and the windings, while its temperature resistance ensures no aging under long-term high-temperature conditions, preventing motor failure due to insulation failure.

[0040] Operating principle: After the shaping bracket 51 is embedded in the heat dissipation groove, it supports the groove wall through the "U"-shaped structure to resist the radial pressure and centrifugal force of the winding. The insulating sleeve 52 covers the contact surface between the bracket and the groove wall, forming an insulating barrier to prevent short circuits caused by damage to the winding enameled wire. During operation: When the motor rotates at high speed, the shaping bracket bears the centrifugal force and maintains the shape of the heat dissipation groove. If there is a minor damage to the winding enameled wire, the insulating sleeve can block the current from flowing through the positioning seat, ensuring the safety of the motor. During regular maintenance, the wear-resistant characteristics of the insulating sleeve ensure long-term protection. Through the material rigidity of the bracket and the insulation characteristics of the sleeve, non-powered shaping support and insulation protection are achieved, which can adapt to the long-term operation of the motor without additional reinforcement or insulation treatment.

[0041] Preferably, in any of the above schemes, the heat-conducting block 6 is made of a heat-conducting material with an insulating layer, one end face of the heat-conducting block 6 is flush with the inner end face of the end ring 3, and the other end face of the heat-conducting block 6 is flush with the outer end face of the end ring 3.

[0042] The above technical solution is adopted: the heat-conducting block 6 (made of ceramic material, with an aluminum oxide insulating layer sprayed on the surface, the size is adapted to the end ring connecting groove, and the end faces of both ends are flush with the inner and outer end faces of the end ring 3) is fixed in the connecting groove with thermally conductive adhesive, and at the same time fits the groove wall of the heat dissipation groove 4. Its core function is to efficiently conduct heat and provide insulation. Its function is to quickly conduct the heat transferred from the heat dissipation groove to the end ring through the high thermal conductivity of ceramic. At the same time, the surface insulating layer blocks the current conduction between the heat-conducting block and the winding and end ring, avoiding the risk of short circuit.

[0043] The operating principle is as follows: The heat from the hollow cup winding 1 is transferred to one side of the heat-conducting block 6 through the heat dissipation groove 4. The heat-conducting block evenly diffuses the heat throughout the entire block through its high thermal conductivity, and then transfers it to the end ring 3 through the other side. The design of the end faces of both ends being flush with the end ring (without protrusions or depressions) ensures that there is no increase in air resistance when the end ring rotates. At the same time, it increases the contact area between the heat-conducting block and the end ring, improving the heat transfer efficiency. During operation: When the motor is working, the temperature of the heat-conducting block rises with the winding, and the heat is continuously conducted to the end ring. The end ring dissipates heat through natural convection through the gap with the motor housing, dissipating the heat to the external environment. After the machine stops, the temperature of the heat-conducting block and the end ring drops synchronously, with no heat accumulation. Through the selection of the heat-conducting block material (high thermal conductivity ceramic + insulation layer), size adaptation (consistent with the connecting groove), and flush end face design, efficient heat dissipation and safe insulation are achieved in synergy, and stable heat conduction can be maintained without additional temperature control components.

[0044] Preferably, in any of the above embodiments, the reinforcing frame 8 includes a supporting frame 81 made of phenolic resin glass cloth tube and reinforcing rods 82 for supporting and reinforcing it. The supporting frame 81 is fixedly installed around its perimeter and the inner walls of the heat dissipation cavity 7. The reinforcing rods 82 are fixedly installed inside the supporting frame 81 in a cross-shaped pattern.

[0045] The above technical solution is adopted: the supporting frame 81 of the reinforcing frame 8 (phenolic resin glass cloth tube, the size of which is adapted to the heat dissipation cavity 7) is fixed to the inner wall of the heat dissipation cavity 7 by thermally conductive adhesive (same as the adhesive for the heat dissipation block). Its core function is to support the cavity structure of the heat dissipation block 6. Its function is to prevent the heat dissipation block from losing structural strength due to the opening of the heat dissipation cavity 7 by using the rigidity of the frame, and to prevent the heat dissipation block from breaking due to centrifugal force when the motor rotates. The core function of the reinforcing rod 82 inside the supporting frame 81 (welded and fixed inside the frame) is to further strengthen the frame structure. Its function is to form an "X"-shaped support by cross distribution, disperse the centrifugal force borne by the heat dissipation block, and at the same time not block the air flow of the heat dissipation cavity, so as to ensure that the heat dissipation function of the cavity is not affected.

[0046] Operating principle: Although the opening of the heat dissipation cavity 7 increases the heat dissipation area of ​​the heat conduction block, it reduces the structural strength. The reinforcing frame 8 compensates for the strength loss through the cooperation of the supporting frame and the reinforcing rod. At the same time, the air in the cavity can circulate freely, accelerating the heat dissipation inside the heat conduction block. Operation process: When the motor rotates, the heat conduction block 6 bears the centrifugal force, the supporting frame 81 directly bears the radial force, and the reinforcing rod 82 disperses the stress in the cross direction. The air in the cavity generates centrifugal airflow with the rotation of the motor, which carries away some heat. After the machine stops, the air convection in the cavity accelerates the cooling of the heat conduction block. Through the structural design of the reinforcing frame (frame + cross rod) and the material selection (phenolic resin glass cloth tube), a balance between structural strength and heat dissipation function is achieved, and the stability of the heat conduction block can be guaranteed without sacrificing the heat dissipation area.

[0047] Preferably, the cooling air duct 9 includes an inner ring air duct 91 and an outer ring air duct 92. The inner ring air duct 91 is located on the side of the heat-conducting block 6 close to the rotor shaft, and the outer ring air duct 92 is located on the side of the heat-conducting block 6 away from the rotor shaft. The diameter of the outer ring air duct 92 is larger than the diameter of the inner ring air duct 91. The air guide slot 10 is opened inside the end ring 3, and an air guide plate 11 fixedly connected to the end ring 3 is provided on one side of the air guide slot 10.

[0048] The above technical solution employs an inner ring air duct 91 (located inside the end ring 3, evenly distributed along the circumference of the end ring, on the side of the heat-conducting block 6 near the rotor shaft) and an outer ring air duct 92 (the same number as the inner ring, located on the side of the heat-conducting block away from the rotor shaft, with a diameter larger than the inner ring air duct). Their core function is to construct an end ring airflow cooling channel. The inner ring's small-diameter air duct accelerates air convection inside the heat-conducting block, while the outer ring's large-diameter air duct accelerates air convection outside, forming a "dual air duct" cooling system. Simultaneously, the air duct surrounds... The airflow is distributed around the heat-conducting block to ensure uniform airflow around the heat-conducting block. The air guide slots 10 (opened inside the end ring 3, located at both ends of the cooling air duct 9 (air inlet and air outlet), with the same number as the air duct, and the air guide vanes 11 on one side are welded and fixed to the end ring, with the tilt angle forming an angle with the tangent direction of the end ring) have the core function of guiding the airflow direction. The function is to guide the centrifugal airflow generated by the motor rotation into the cooling air duct through the tilt angle of the air guide vanes, avoiding airflow turbulence. The trapezoidal slots increase the air inlet / outlet area and reduce airflow resistance.

[0049] Operating principle: When the motor rotates, the end ring 3 drives the air guide vane 11 to rotate synchronously. The air guide vane guides the external air into the air guide slot 10 along the inclined direction. The airflow flows quickly over the surface of the heat-conducting block 6 through the inner ring air duct 91 and the outer ring air duct 92, carrying away the heat transferred from the heat-conducting block to the end ring. The airflow is discharged from the air guide slot at the other end of the air duct, forming a continuous airflow circulation. Operating process: After the motor starts, the speed increases to the rated value, and the air guide vane generates a stable centrifugal airflow. The airflow enters the cooling air duct through the air guide slot and exchanges heat with the heat-conducting block and the end ring. The heated airflow is discharged from the slot at the other end. After the machine stops, the airflow gradually stops, and the residual air in the air duct continues to dissipate heat through natural convection. By the difference between the inner and outer diameters of the air duct (smaller inner diameter and larger outer diameter) and the tilt angle of the air guide vane, the airflow speed and flow rate are optimized. The centrifugal force of the motor rotation drives the airflow, and active heat dissipation can be achieved without an additional fan.

[0050] The working principle of the hollow cup motor rotor frame of this utility model is as follows:

[0051] During assembly, the insulating frame 5, consisting of the shaping bracket 51 and the insulating sleeve 52, is first embedded into the heat dissipation groove 4 of the insulating positioning seat 2 and fixed by hot-melt bonding. Then, the insulating positioning seat is hot-melt bonded to the inner wall of the hollow cup winding 1. Subsequently, the end ring 3 is welded to both ends of the hollow cup winding, so that the end ring connecting groove and the heat dissipation groove 4 are precisely aligned. Next, the heat-conducting block 6 with the insulating layer is embedded into the connecting groove and attached to the heat dissipation groove. The reinforcing frame 8 (support frame 81 and cross reinforcing rod 82) in the heat-conducting block is simultaneously supported and fixed. Finally, the rotor shaft is pressed into the middle of the end ring 3, which is fitted with the center hole of the insulating positioning seat 2. When the motor is running, the rotor shaft drives the end ring 3 and the hollow cup winding 1. The cup winding 1 rotates synchronously, and the insulating positioning seat 2 maintains the winding shape to prevent centrifugal force from causing loosening. The heat generated by the hollow cup winding 1 is partly naturally convected through the air gap of the heat dissipation slot 4, and partly transferred to the insulating positioning seat through the heat dissipation slot, and then conducted to the heat conduction block 6. The heat conduction block increases the heat dissipation area through the heat dissipation cavity 7 and transfers the heat to the end ring. At the same time, the rotation of the end ring drives the air guide 11 to generate centrifugal airflow. The airflow is introduced into the cooling air duct 9 through the air guide slot 10 (the inner ring air duct 91 accelerates the inner convection, and the outer ring air duct 92 increases the outer flow), quickly carrying away the heat from the end ring and the heat conduction block. All structures work together to achieve efficient heat dissipation and stable power transmission.

[0052] Compared with the prior art, the present invention has the following advantages:

[0053] 1. A heat dissipation groove 4 communicating with the interior of the hollow cup motor is provided inside the insulating positioning seat 2 of the hollow cup motor rotor frame, and a heat-conducting block 6 made of heat-conducting material is set inside the end ring 3, so that the heat-conducting block 6 is connected and in close contact with the interior of the hollow cup motor. The heat generated by the hollow cup motor winding can be conducted to the outside of the motor through the heat-conducting block 6. At the same time, the heat dissipation cavity 7 inside the heat-conducting block 6 increases the heat conduction area, and the cooling air duct 9 accelerates the start and stop circulation around the heat-conducting block 6, further improving the heat conduction and heat dissipation efficiency of the heat-conducting block 6, facilitating heat dissipation of the rotor frame, and helping to improve the working stability of the rotor frame.

[0054] 2. An insulating frame 5 and a reinforcing frame 8 are installed inside the heat dissipation slot 4 and the heat dissipation cavity 7 to support and fix them. While expanding the heat dissipation area, the strength and stability of the insulating positioning seat 2 and the heat conduction block 6 structure are ensured, the overall structural strength of the rotor frame is ensured, and the stability of motor operation is ensured.

Claims

1. A hollow cup motor rotor frame, comprising a hollow cup winding (1) formed by winding a hollow cylindrical coil with high-strength enameled wire, wherein an insulating positioning seat (2) for positioning and protection is fixedly installed at one end of the hollow cup winding (1), and end rings (3) for power transmission are fixedly installed at both ends of the hollow cup winding (1), characterized in that: The interior of the insulating positioning seat (2) is provided with heat dissipation grooves (4) for transferring heat. An insulating skeleton (5) for shaping and supporting is fixedly installed inside the heat dissipation grooves (4). One side of the heat dissipation grooves (4) is provided with a heat conducting block (6) penetrating through the end ring (3). A heat dissipation cavity (7) for heat dissipation is opened inside the heat conducting block (6). A reinforcing frame (8) for supporting and fixing the heat conducting block (6) is arranged inside the heat dissipation cavity (7). A cooling air duct (9) surrounding the heat conducting block (6) is opened inside the end ring (3). Air guiding slot openings (10) for guiding air flow are arranged at both ends of the cooling air duct (9).

2. A hollow cup motor rotor skeleton as claimed in claim 1, characterized in that: The insulating positioning seat (2) is located on one side of the end ring (3). A rotor shaft is fixedly installed in the middle of the end ring (3). The rotor shaft and the insulating positioning seat (2) are fixedly installed.

3. A hollow cup motor rotor skeleton according to claim 2, characterized in that: The heat dissipation grooves (4) are located inside the cup rotor winding (1). A connecting groove for fixing the heat conducting block (6) is opened inside the end ring (3). The position of the connecting groove corresponds to the position of the heat dissipation grooves (4). The size of the connecting groove is larger than the size of the heat dissipation grooves (4).

4. A hollow cup motor rotor skeleton according to claim 3, characterized in that: The insulating skeleton (5) includes a shaping support (51) made of phenolic resin fiberglass tube and an insulating sleeve layer (52) made of polyether ether ketone film. The shaping support (51) is arranged in a "mouth" - shaped structure. The insulating sleeve layer (52) is sleeved on the surface of the shaping support (51). The insulating sleeve layer (52) and the peripheries of the heat dissipation grooves (4) are fixedly bonded by hot melting.

5. A hollow cup motor rotor skeleton as claimed in claim 4, characterized in that: The heat conducting block (6) is made of a heat conducting material with an insulating layer. One end face of the heat conducting block (6) is flush with the inner end face of the end ring (3). The other end face of the heat conducting block (6) is flush with the outer end face of the end ring (3).

6. A hollow cup motor rotor skeleton as claimed in claim 5, characterized in that: The reinforcing frame (8) includes a supporting frame (81) made of phenolic resin fiberglass tube and reinforcing rods (82) for supporting and strengthening it. The peripheries of the supporting frame (81) are fixedly installed with the inner walls of the peripheries of the heat dissipation cavity (7). Cross - distributed reinforcing rods (82) are fixedly installed inside the supporting frame (81).

7. A hollow cup motor rotor skeleton as claimed in claim 6, characterized in that: The cooling air duct (9) includes an inner - ring air duct (91) and an outer - ring air duct (92). The inner - ring air duct (91) is located on the side of the heat conducting block (6) close to the rotor shaft. The outer - ring air duct (92) is located on the side of the heat conducting block (6) away from the rotor shaft. The diameter of the outer - ring air duct (92) is larger than the diameter of the inner - ring air duct (91). The air guiding slot openings (10) are opened inside the end ring (3). A wind guiding piece (11) fixedly connected to the end ring (3) is arranged on one side of the air guiding slot openings (10).

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