Self-heat-dissipation type outer rotor permanent magnet direct drive motor web type stator shaft
Patent Information
- Application Number
- CN202522192277.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-16
AI Technical Summary
[0004]为克服上述缺陷，本实用新型的实施例提供了一种自散热式外转子永磁直驱电机腹板式定子轴，解决了现有技术中永磁直驱绕组定子轴一体化且复杂、重量大、散热差的技术问题
本实用新型中，采用星形轴和支撑轴的组合式拼接设计，无需定做整根厚壁轴，降低加工难度与原材料成本，同时支撑轴直径可根据轴承灵活设计，避免轴承过大导致的附件安装空间不足及轴承成本过高问题；相比传统整根厚壁管空心轴，星形轴通过内部镂空设计及组合式结构减轻整体重量，应用于起重机起升机构时可减少小车总成重量与轮压，符合永磁直驱轻量化设计理念；星形轴内部独立散热通道直接贯穿绕组钢片安装区域，外部空气可自然进入并直接与发热钢片及通道内壁接触，避免传统结构中热量需通过厚壁传导的弊端，有效提升散热效率，防止绕组内部过热。
Smart Images
Figure CN224843248U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of permanent magnet direct drive winding stator shaft technology, specifically to a web-type stator shaft for a self-heating external rotor permanent magnet direct drive motor. Background Technology
[0002] Gearbox-free permanent magnet direct drive has advantages such as simple structure, small size, significant energy saving, large torsional torque without stalling or slippage, high precision, and no impact on starting current. It has developed rapidly in recent years and is mainly used in industries such as tensioners of coal mine belt conveyors, hoisting winches, and lifting mechanisms of bridge and gantry cranes.
[0003] The existing permanent magnet direct drive winding stator shaft is a single thick-walled hollow tube. Its hollow design is intended for ventilation and heat dissipation, while the use of a single thick-walled seamless tube ensures the overall rigidity and strength of the shaft. However, this structural design has significant drawbacks: First, it is costly. Because the finished stator shaft needs sufficient thickness to guarantee rigidity and strength, the corresponding blank shaft usually needs to be custom-made. This is because the middle part of the stator shaft needs to be fitted with silicon steel sheets, and copper wire (i.e., the winding part) needs to be wound inside the silicon steel sheets. Therefore, the middle diameter needs to be large. Furthermore, both ends of the shaft are bearing support ends, and many accessories are located at these ends. The bearings cannot be too large, otherwise there will be no space for other accessories to be installed. The bearings themselves are also expensive; secondly, the weight is too large. The original direct drive structure design was simple and aimed at achieving lightweighting, but the stator shaft weight under this structure is significantly increased, which contradicts the design concept of permanent magnet direct drive; thirdly, the heat dissipation performance is poor. When the motor is working, the part that generates heat is the coil winding. The external rotor uses permanent magnets and has no coils. All the heat generated by energy consumption is concentrated in the stator winding. The stator winding can only conduct heat through the thick wall of the stator shaft, and then rely on an external fan to blow air into the inner hole of the stator shaft to achieve air heat conduction. This heat dissipation method that relies on the stator shaft itself has a very poor heat dissipation effect. The core reason is that the airflow cannot blow into the inside of the winding, resulting in the inability to form an effective airflow channel inside the winding. Utility Model Content
[0004] To overcome the above-mentioned defects, the embodiments of this utility model provide a web-type stator shaft for a self-heating external rotor permanent magnet direct drive motor, which solves the technical problems of integrated and complex permanent magnet direct drive winding stator shafts, heavy weight, and poor heat dissipation in the prior art.
[0005] According to one aspect, at least one embodiment of the present invention provides a web-type stator shaft for a self-heating external rotor permanent magnet direct drive motor, the stator shaft being used to mount the motor winding steel sheets, comprising: The star-shaped shaft has an external mounting area for arranging and mounting a number of motor winding steel sheets at intervals, and the star-shaped shaft has a heat dissipation channel inside. The air guide shroud has two shrouds, which are respectively disposed at both ends of the star-shaped shaft. The air guide shroud has a mounting hole in the middle, and the mounting hole is coaxially arranged with the star-shaped shaft. The first support shaft is inserted into the mounting hole and located at one end of the star-shaped shaft; The second support shaft is inserted into the mounting hole and located at the other end of the star-shaped shaft; the first support shaft, the second support shaft, and the star-shaped shaft are combined to form the stator shaft.
[0006] Optionally, the star-shaped axis is a six-part star-shaped axis.
[0007] Optionally, the length of the first support shaft is less than the length of the second support shaft.
[0008] Optionally, both the first support shaft and the second support shaft are thin-walled hollow tube structures, and both the first support shaft and the second support shaft are connected to the heat dissipation channel.
[0009] Optionally, the star-shaped axis includes: The six-slotted ring has two parts, and each of the six-slotted rings has six mounting slots evenly spaced on its outer peripheral wall. The air guide shroud is disposed inside the six-slotted ring. The main wall is arranged along the axial direction of the six equally divided groove ring, and the two ends of the main wall have snap-fit ends, which snap-fit ends are engaged with the mounting groove. The main wall has four secondary walls, all of which are arranged along the axial direction of the six equally divided groove rings. The two ends of each secondary wall are respectively engaged with the two corresponding mounting slots on the two six equally divided groove rings. The exterior of the main wall and the secondary walls are used to install the motor winding steel sheets.
[0010] Optionally, each end face of the main wall has two snap-fit ends, and the two snap-fit ends on the same side end face are respectively snapped into the two mounting slots on the six equally divided groove ring located on the same diameter.
[0011] Optionally, both ends of the main wall have grooves with the openings of the grooves facing the mounting holes. After the first support shaft and the second support shaft are inserted into the mounting holes, the ends of the first support shaft and the second support shaft near the main wall are located in the grooves.
[0012] Optionally, the main wall also has receiving grooves at both ends, the openings of which face the air guide shroud, and the receiving grooves are used to receive the air guide shroud.
[0013] Optionally, the outer peripheral walls of the first and second support shafts inserted into the star-shaped shaft are provided with air outlets, and the air outlets are connected to the heat dissipation channel.
[0014] Optionally, the motor winding steel sheets are silicon steel sheets or silicon steel sheets.
[0015] The beneficial effects of this utility model are as follows: This invention employs a combined splicing design of a star-shaped shaft and a support shaft, eliminating the need for custom-made thick-walled shafts, thus reducing processing difficulty and raw material costs. Simultaneously, the diameter of the support shaft can be flexibly designed according to the bearing, avoiding problems such as insufficient installation space for accessories and excessive bearing costs due to oversized bearings. Compared to traditional thick-walled hollow shafts, the star-shaped shaft reduces overall weight through its internal hollow design and combined structure. When applied to crane lifting mechanisms, it reduces the weight of the trolley assembly and wheel pressure, aligning with the lightweight design concept of permanent magnet direct drive. The independent heat dissipation channel inside the star-shaped shaft directly penetrates the winding steel sheet installation area, allowing external air to naturally enter and directly contact the heating steel sheets and the inner wall of the channel. This avoids the drawback of heat conduction through thick walls in traditional structures, effectively improving heat dissipation efficiency and preventing overheating inside the windings. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of the stator shaft in one embodiment of the present invention; Figure 2 for Figure 1 The stator shaft front view in the embodiment; Figure 3 for Figure 2 A schematic diagram of the structure along direction A in the embodiment; Figure 4 for Figure 2 A schematic diagram of the structure at BB in the embodiment; Figure 5 for Figure 1 A schematic diagram of the structure of the six-slotted ring in the embodiment; Figure 6 for Figure 1 A schematic diagram of the main wall structure in the embodiment; Figure 7 for Figure 1 A schematic diagram of the secondary wall structure in the embodiment; Figure 8 for Figure 1 A schematic diagram of the structure of the air guide shroud in the embodiment; Figure 9 for Figure 1 A schematic diagram of the star-shaped shaft in the embodiment.
[0018] In the diagram: 1. Star-shaped shaft, 101. Heat dissipation channel, 2. Air guide shroud, 201. Mounting hole, 3. First support shaft, 4. Second support shaft, 5. Six-slotted ring, 501. Mounting slot, 6. Main wall, 601. Snap-fit end, 7. Secondary wall, 602. Groove, 603. Receiving slot, 8. Air outlet. Detailed Implementation
[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.
[0020] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."
[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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.
[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0025] like Figures 1-9 As shown, this invention illustrates a web-type stator shaft for a self-heating external rotor permanent magnet direct drive motor according to one embodiment. This web-type stator shaft is used to mount the motor winding steel sheets and is composed of a star-shaped shaft 1, two air guide shrouds 2, a first support shaft 3, and a second support shaft 4. The star-shaped shaft 1, the first support shaft 3, and the second support shaft 4 are joined together. An mounting area is formed on the outside of the star-shaped shaft 1, allowing for the spaced arrangement of the motor winding steel sheets. Multiple heat dissipation channels 101 are formed inside the star-shaped shaft 1 along its axial direction. The edges of the two air guide covers 2 are fixedly connected to the outer peripheral walls of the two ends of the star shaft 1 by bolts. The air guide cover 2 has a mounting hole 201 in the middle to ensure that the mounting hole 201 is strictly coaxial with the star shaft 1. The first support shaft 3 and the second support shaft 4 are both solid stepped shafts. The shaft diameter is interference-fitted with the mounting hole 201 of the air guide cover 2. They can be inserted and fixed into the mounting holes 201 at both ends of the star shaft 1 respectively. After insertion, the axes of the three are completely coincident, forming a complete stator shaft.
[0026] Furthermore, when the motor is running, the steel sheets of the motor windings, which are wrapped with copper wire, generate heat. External air flows towards the stator shaft, first contacting the air guides 2 at both ends of the star shaft 1. Under the guidance of the air guides 2, the airflow enters the heat dissipation channel 101 inside the star shaft 1 along the mounting holes 201. Part of the heat is conducted through the steel sheets to the mounting area of the star shaft 1, and then transferred to the heat dissipation channel 101, where it exchanges heat with the cold air inside the channel. Another part of the heat is directly radiated into the cold air inside the heat dissipation channel 101. The heated air, due to its lower density, flows upward and is discharged from the mounting holes 201 of the air guides 2 at the other end of the star shaft 1, forming a continuous natural cooling airflow. In addition, the first support shaft 3 and the second support shaft 4 serve as bearing support ends, which can stably install bearings and other accessories, ensuring that the motor rotor rotates smoothly around the stator shaft and avoiding operating errors caused by shaft misalignment.
[0027] This structure adopts a combined splicing design of star-shaped shaft 1 and support shaft, eliminating the need to customize a whole thick-walled shaft, reducing processing difficulty and raw material costs. At the same time, the diameter of the support shaft can be flexibly designed according to the bearing, avoiding the problems of insufficient installation space for accessories and excessive bearing costs caused by excessively large bearings. Compared with the traditional whole thick-walled hollow tube shaft, star-shaped shaft 1 reduces the overall weight through internal hollow design and combined structure. When applied to crane lifting mechanism, it can reduce the weight of the trolley assembly and wheel pressure, which is in line with the lightweight design concept of permanent magnet direct drive. The independent heat dissipation channel 101 inside star-shaped shaft 1 directly runs through the winding steel sheet installation area, allowing external air to enter naturally and directly contact the heating steel sheet and the inner wall of the channel, avoiding the disadvantage of heat conduction through thick walls in traditional structures, effectively improving heat dissipation efficiency and preventing overheating inside the winding.
[0028] For example, such as Figure 1 As shown, star axis 1 is a star axis divided into six equal parts.
[0029] Furthermore, the star-shaped shaft 1 is defined as a six-part star-shaped shaft 1. The radial cross-section of the six-part star-shaped shaft 1 has a regular hexagonal outline, and it is evenly divided into symmetrical installation areas along the axial direction. The outer wall of each installation area is a planar structure to accommodate the installation requirements of the motor winding steel sheets. Corresponding heat dissipation channels 101 are set inside the star-shaped shaft 1. Each heat dissipation channel 101 is located between two adjacent installation areas, and the channel cross-sectional dimensions are consistent to ensure uniform airflow distribution. The two end faces of the six-part star-shaped shaft 1 are flat structures, which can fit tightly with the air guide shroud 2 to ensure no airflow leakage.
[0030] The symmetrical heat dissipation channel 101 of the six-part star-shaped shaft 1 allows external air to fully cover the winding steel sheets, solving the problem of localized heat dissipation airflow concentration in traditional structures and avoiding aging of the copper wire insulation layer due to localized overheating. Compared with traditional circular thick-walled tubes, its radial cross-section improves bending stiffness with similar weight, eliminating the need to increase wall thickness to ensure strength and further reducing weight. At the same time, the symmetrical structure improves the dynamic balance accuracy of the shaft system during operation. The symmetrical planar installation area allows for more precise positioning of the winding steel sheets, eliminating the need to adjust the circumferential angle of the steel sheets during installation and improving installation efficiency.
[0031] For example, such as Figure 1 and Figure 2 As shown, the length of the first support shaft 3 is less than the length of the second support shaft 4.
[0032] Furthermore, the first support shaft 3 has only a bearing mounting step on its shaft body for mounting bearings and small accessories on the non-load end of the motor; the second support shaft 4 has a bearing mounting step on its shaft body for mounting bearings and large accessories on the load end of the motor. Both shafts have the same diameter and are interference-fitted with the mounting hole 201 of the air guide shroud 2. The end of the short shaft is flush with the end of the internal heat dissipation channel 101 of the star shaft 1, and the end of the long shaft extends into the heat dissipation channel 101, ensuring that external air can enter the heat dissipation channel 101 through the end of the long shaft.
[0033] For example, such as Figure 2 As shown, both the first support shaft 3 and the second support shaft 4 are thin-walled hollow tube structures, and both the first support shaft 3 and the second support shaft 4 are connected to the heat dissipation channel 101.
[0034] Furthermore, both the first support shaft 3 and the second support shaft 4 are defined as thin-walled hollow tube structures, and are connected to the heat dissipation channel 101. The support shaft tube wall is relatively thin, and a hollow channel is provided inside the tube. The end inserted into the mounting hole 201 of the air guide shroud 2 has evenly distributed ventilation holes, which are completely aligned with the heat dissipation channel 101 inside the star-shaped shaft 1, realizing the connection between the hollow channel of the support shaft and the heat dissipation channel 101. The outer wall of the support shaft is provided with annular reinforcing ribs to compensate for the insufficient rigidity of the thin-walled structure, and the reinforcing ribs do not affect the fit with the mounting hole 201.
[0035] Compared to traditional solid shafts, the thin-walled hollow tube structure significantly reduces weight. Combined with the hollow design of the star-shaped shaft 1, the overall weight of the stator shaft is significantly reduced compared to traditional thick-walled hollow tube shafts, effectively reducing the weight of the crane trolley assembly and wheel pressure. The dual air intake paths increase the amount of external air entering the heat dissipation channel 101, and the airflow in the hollow channel of the support shaft can directly blow towards the vicinity of the winding steel sheets, solving the problem that airflow cannot reach the inside of the winding in traditional structures, and reducing the maximum temperature of the motor windings. The thin-walled hollow tube can be processed from standard seamless steel pipes.
[0036] For example, such as Figure 3 As shown, the star-shaped shaft 1 structure includes two six-slotted rings 5, a main wall 6, and four secondary walls 7. The two six-slotted rings 5 are circular ring structures with an outer diameter consistent with the outer diameter of the star-shaped shaft 1 and an inner ring diameter that matches the outer diameter of the air guide shroud 2. Each slotted ring has equally spaced mounting slots 501 on its outer circumferential wall. The air guide shroud 2 is fixed to the inner ring of the slotted ring by bolts. The main wall 6 is a long rectangular plate structure with integrally formed snap-fit ends 601 at both ends. The snap-fit ends 601 can be inserted into the corresponding mounting slots 501 of the two six-slotted rings 5 and fixed by welding. The four secondary walls 7 have the same structure as the main wall 6 and are arranged along the axis of the slotted rings. The two ends of the secondary walls 7 are snapped into the corresponding mounting slots 501 on the two slotted rings, and the outer walls of the main wall 6 and secondary walls 7 are on the same cylindrical surface, forming the mounting surface for the motor winding steel sheets. Independent heat dissipation channels 101 are formed between the main wall 6, the secondary walls 7, and the two slotted rings.
[0037] Furthermore, during motor assembly, firstly, two six-slotted rings 5 are fixed on the tooling fixture. Then, the snap-fit end 601 of the main wall 6 is inserted into the slotted ring mounting slot 501 and welded. Subsequently, four secondary walls 7 are installed in sequence to form the star-shaped shaft 1 frame. Next, the motor winding steel sheets are fitted onto the outside of the main wall 6 and secondary walls 7. Finally, the air guide shroud 2 and support shaft are installed to complete the stator shaft assembly. When the motor is running, the winding steel sheets generate heat, creating a temperature difference. Under the action of the temperature difference, external air enters the heat dissipation channel 101 of the star-shaped shaft 1 through the air guide shroud 2. The airflow flows through the inner wall of the winding steel sheets in the channel, fully exchanging heat with the heat conducted by the steel sheets. The heated air is discharged from the other end of the air guide shroud 2. At the same time, the main wall 6 and secondary walls 7, as a load-bearing skeleton, can withstand the weight of the winding steel sheets and the radial force during motor operation, preventing shaft deformation.
[0038] For example, such as Figure 6 As shown, each end face of the main wall 6 has two snap-fit ends 601, and the two snap-fit ends 601 on the same side end face are respectively snapped into two mounting grooves 501 on the six-divided groove ring 5 located on the same diameter.
[0039] Furthermore, two snap-fit ends 601 on each end face of the main wall 6 are respectively snapped into two mounting slots 501 on the six-equal-slot ring 5, which are located on the same diameter. The two snap-fit ends 601 on each end face of the main wall 6 are symmetrically distributed along the length of the wall, and the spacing is adapted to the diameter of the six-equal-slot ring 5; the mounting slots 501 on the six-equal-slot ring 5 are symmetrically distributed according to multiple sets of diameters, and the two snap-fit ends 601 of the main wall 6 are exactly inserted into one set of symmetrical mounting slots 501. After being fixed by welding, the center line of the main wall 6 is completely coincident with the axis of the slot ring; the four secondary walls 7 are respectively inserted into the remaining symmetrical mounting slots 501, ensuring that the main wall 6 is located at the center of the star-shaped axis 1, and the four secondary walls 7 are evenly distributed around the main wall 6.
[0040] When the motor is running, the main wall 6 acts as a load-bearing frame, bearing most of the radial force transmitted by the motor rotor. Since the main wall 6 is positioned by the mounting slot 501 of the same diameter, it is ensured that it is always at the center of the star shaft 1, avoiding shaft eccentricity caused by the offset of the main wall 6. The heating of the winding steel sheets creates a temperature difference, and the external air enters the heat dissipation channel 101 under the action of the temperature difference. Since the heat dissipation channel 101 between the main wall 6 and the secondary wall 7 is symmetrically distributed, the cold air can flow evenly through each channel and fully exchange heat with the winding steel sheets, avoiding insufficient local heat dissipation caused by the offset of the channel. The four secondary walls 7 are evenly distributed around the main wall 6, which can help bear the radial force, and at the same time make the installation of the winding steel sheets more symmetrical, the magnetic field generated by the steel sheets when working is more uniform, and reduce the electromagnetic noise when the motor is running.
[0041] For example, such as Figure 6As shown, grooves 602 are provided at both ends of the main wall 6. The openings of the grooves 602 face the mounting holes 201 of the air guide shroud 2. The size of the grooves 602 is adapted to the end of the support shaft. When the first support shaft 3 and the second support shaft 4 are inserted into the mounting holes 201 of the air guide shroud 2, the end of the support shaft near the main wall 6 is precisely embedded in the groove 602. A gap is reserved between the end of the support shaft and the bottom of the groove 602 for airflow. A rubber sealing gasket is provided on the inner wall of the groove 602, which can reduce airflow leakage between the support shaft and the main wall 6, and at the same time play a buffering role to avoid component collision caused by shaft vibration.
[0042] Furthermore, during motor operation, the winding steel sheets generate heat, creating a temperature difference. External air, driven by this temperature difference, enters through the hollow channel of the support shaft or the gap in the air guide shroud 2. Part of the airflow enters the heat dissipation channel 101 of the star shaft 1 through the gap between the end of the support shaft and the bottom of the groove 602, while another part directly enters the heat dissipation channel 101. The rubber sealing gasket prevents airflow leakage from the gap between the support shaft and the groove 602, ensuring that most of the cool air is used for heat dissipation and is discharged after sufficient heat exchange with the winding steel sheets. Simultaneously, when the motor vibrates during operation, the rubber sealing gasket absorbs the vibration energy between the support shaft and the main wall 6, reducing shaft noise and preventing component wear due to vibration. In addition, the end of the support shaft embedded in the groove 602 provides axial positioning for the support shaft, preventing axial movement during operation.
[0043] The rubber gasket reduces airflow leakage and increases the amount of external air entering the heat dissipation channel 101. At the same time, the gap between the end of the support shaft and the groove 602 can guide the airflow directly to the heat dissipation channel 101, further improving heat exchange efficiency and reducing winding temperature. The groove 602 provides axial positioning for the support shaft, reducing axial movement of the shaft system and avoiding bearing wear caused by movement. The buffering effect of the rubber gasket reduces motor operating noise and improves the comfort of the working environment. The end of the support shaft is embedded in the groove 602, eliminating the need for additional axial positioning components, shortening the axial dimension of the stator shaft, adapting to narrow installation spaces, reducing the number of components, and lowering assembly difficulty.
[0044] For example, such as Figure 6 As shown, the main wall 6 also has receiving grooves 603 at both ends. The openings of the receiving grooves 603 face the air guide hood 2 and the receiving grooves 603 are used to receive the air guide hood 2.
[0045] Furthermore, receiving grooves 603 are provided at both ends of the main wall 6, with the openings of the receiving grooves 603 facing the air guide hood 2. The size of the receiving grooves 603 is adapted to the air guide hood 2, and the inner wall of the receiving grooves 603 is provided with annular steps for positioning the air guide hood 2. The edge of the air guide hood 2 can be embedded in the receiving grooves 603 and fits against the annular steps. The air guide hood 2 is fixed to the bottom of the receiving grooves 603 by bolts, and the outer end face of the air guide hood 2 is flush with the end face of the main wall 6. Ventilation holes are provided at the bottom of the receiving grooves 603, and the ventilation holes are aligned with the heat dissipation channel 101 of the star-shaped shaft 1 to ensure that external air can enter the heat dissipation channel 101 from the air guide hood 2.
[0046] During motor assembly, the air guide shroud 2 is embedded into the receiving groove 603 of the main wall 6, quickly positioned using an annular step, and then fixed with bolts to prevent the air guide shroud 2 from being misaligned. When the motor is running, the winding steel sheets heat up, creating a temperature difference. External air is driven by this temperature difference to contact the air guide shroud 2. Because the air guide shroud 2 and the receiving groove 603 fit tightly, the airflow cannot leak from the gap between the air guide shroud 2 and the main wall 6. Instead, it all enters the heat dissipation channel 101 of the star shaft 1 through the mounting hole 201 in the middle of the air guide shroud 2 and the ventilation hole at the bottom of the receiving groove 603. After fully exchanging heat with the winding steel sheets, the airflow is discharged, improving the airflow utilization rate. At the same time, the air guide shroud 2 being embedded in the receiving groove 603 can reduce the entry of external dust and moisture into the shaft system, protecting the heat dissipation channel 101 and the winding steel sheets.
[0047] For example, such as Figure 1 As shown, air outlets 8 are formed on the outer peripheral walls of the first support shaft 3 and the second support shaft 4 inserted into the star-shaped shaft 1. The air outlets 8 are connected to the heat dissipation channel 101. The shaft portion of the support shaft inserted into the star-shaped shaft 1 has air outlets 8 evenly distributed circumferentially. The axis of the air outlet 8 is perpendicular to the axis of the heat dissipation channel 101, and each air outlet 8 is exactly aligned with one heat dissipation channel 101 of the star-shaped shaft 1. The inner wall of the air outlet 8 is rounded to reduce wind resistance. The hollow channel of the support shaft is connected to the air outlet 8 to form an airflow path. A dustproof mesh is attached to the outside of the air outlet 8 to prevent dust from entering the heat dissipation channel 101.
[0048] When the motor is running, the winding steel sheets heat up, creating a temperature difference. Driven by this temperature difference, the external air flows in two paths: one path enters through the hollow channel of the support shaft and is directly blown into the heat dissipation channel 101 of the star shaft 1 through the air outlet 8 on the shaft. The airflow direction is perpendicular to the axis of the heat dissipation channel 101, which dissipates heat from the inner wall of the heat dissipation channel 101 and the inner sidewall of the winding steel sheets, enhancing the heat exchange effect; the other path enters the heat dissipation channel 101 through the air guide shroud 2, merging with the airflow from the air outlet 8. Together, they absorb heat and are discharged from the other end of the star shaft 1. The dust filter can filter dust from the air, preventing dust accumulation in the heat dissipation channel 101 and ensuring smooth airflow. Furthermore, when the motor stops, residual heat can be discharged in the reverse direction through the air outlet 8, accelerating the cooling of the stator shaft.
[0049] Furthermore, the motor winding steel sheets are made of silicon steel or silicon steel. Silicon steel sheets have high magnetic permeability and low iron loss; silicon steel sheets also have magnetic permeability and low iron loss. Both types of steel sheets are manufactured using a cold rolling process and coated with an insulating coating to prevent short circuits between the steel sheets. The steel sheets are annular in shape, with an inner diameter that matches the outer diameter of the mounting area of the star shaft 1, allowing them to be tightly fitted onto the outside of the star shaft 1 and fixed with bolts.
[0050] When the motor is running, the winding steel sheets generate magnetic flux under the influence of an alternating magnetic field. Due to their high permeability, hysteresis losses are reduced, lowering the proportion of electrical energy converted into heat. Simultaneously, the low iron loss characteristic reduces the heat generated by the steel sheets themselves. Combined with the heat dissipation channel 101 of the star shaft 1, external air can naturally enter and quickly remove the small amount of heat generated by the steel sheets. Furthermore, the insulating coating on the surface of the steel sheets prevents the formation of eddy currents between adjacent sheets, avoiding additional heat generated by eddy current losses and further reducing heat sources. When the motor is used in different scenarios, silicon steel sheets are more suitable for long-term continuous operation, while silicon steel sheets are suitable for intermittent operation scenarios.
[0051] High permeability and low iron loss steel sheets improve the electromagnetic efficiency of the motor. Compared with traditional ordinary steel sheets, this reduces the power consumption of the motor during operation, which is in line with the energy-saving design concept of permanent magnet direct drive. The low iron loss of the steel sheets themselves reduces the total heat generation and lightens the burden on the heat dissipation system. Even with weak external airflow, the winding temperature can still be controlled within a safe range, improving the reliability of the motor. Silicon steel sheets are suitable for long-term heavy-load operation, while silicon steel sheets are suitable for intermittent light-load operation. Users can choose according to their actual needs, reducing equipment procurement costs.
[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A web-type stator shaft for a self-heating external rotor permanent magnet direct drive motor, the stator shaft being used to mount the motor winding steel sheets, characterized in that... include: The star shaft (1) has an external mounting area, in which several motor winding steel sheets are arranged at intervals. The star shaft (1) has a heat dissipation channel (101) inside. Two air guide covers (2) are provided, and the two air guide covers (2) are respectively disposed at both ends of the star-shaped shaft (1). The air guide cover (2) has a mounting hole (201) in the middle, and the mounting hole (201) is coaxially arranged with the star-shaped shaft (1). The first support shaft (3) is inserted into the mounting hole (201) and located at one end of the star-shaped shaft (1); The second support shaft (4) is inserted into the mounting hole (201) and located at the other end of the star shaft (1); the first support shaft (3), the second support shaft (4) and the star shaft (1) are combined to form the stator shaft.
2. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 1, characterized in that, The star-shaped axis (1) is a six-part star-shaped axis.
3. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 1, characterized in that, The length of the first support shaft (3) is less than the length of the second support shaft (4).
4. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 1, characterized in that, Both the first support shaft (3) and the second support shaft (4) are thin-walled hollow tube structures, and both the first support shaft (3) and the second support shaft (4) are connected to the heat dissipation channel (101).
5. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 1, characterized in that, The star-shaped axis (1) includes: There are two six-slotted rings (5), and six mounting slots (501) are equally spaced on the outer peripheral wall of each six-slotted ring (5). The air guide shroud (2) is disposed inside the six-slotted ring (5). The main wall (6) is arranged along the axial direction of the six equally divided groove ring (5). The two ends of the main wall (6) have snap-fit ends (601), which snap-fit ends (601) with the mounting groove (501). The secondary wall (7) has four parts, and the four secondary wall (7) are arranged along the axial direction of the six equally divided groove ring (5). The two ends of the secondary wall (7) are respectively engaged with the two corresponding mounting grooves (501) on the two six equally divided groove rings (5). The main wall (6) and the secondary wall (7) are used to install motor winding steel sheets.
6. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 5, characterized in that, The main wall (6) has two snap-fit ends (601) on each end face. The two snap-fit ends (601) on the same side end face are respectively snapped into the two mounting grooves (501) on the six-segmented groove ring (5) located on the same diameter.
7. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 5, characterized in that, The main wall (6) has grooves (602) at both ends. The openings of the grooves (602) face the mounting holes (201). After the first support shaft (3) and the second support shaft (4) are inserted into the mounting holes (201), the ends of the first support shaft (3) and the second support shaft (4) near the main wall (6) are located in the grooves (602).
8. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 5, characterized in that, The main wall (6) also has receiving grooves (603) at both ends, the openings of the receiving grooves (603) facing the air guide hood (2), and the receiving grooves (603) are used to receive the air guide hood (2).
9. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 1, characterized in that, The first support shaft (3) and the second support shaft (4) are inserted into the outer peripheral wall of the star-shaped shaft (1) and an air outlet (8) is provided. The air outlet (8) is connected to the heat dissipation channel (101).
10. The web-type stator shaft of a self-heating external rotor permanent magnet direct drive motor according to claim 1, characterized in that, The motor winding steel sheets are silicon steel sheets or silicon steel sheets.