A rotor sheath, rotor assembly, motor and magnetic levitation air compressor
By introducing a heat-collecting jacket layer and a heat-dissipating jacket layer into the rotor sheath and connecting them with a thermal bridge, the problem of poor heat dissipation performance of the carbon fiber jacket was solved, achieving efficient heat dissipation and improved stability of the rotor sheath.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-31
AI Technical Summary
When the existing rotor sheath uses carbon fiber sleeve, the heat dissipation performance is low, which cannot effectively solve the heat dissipation problem of high-speed motor rotor in high-temperature environment, resulting in demagnetization of magnets and poor rotor stability.
A rotor sheath is designed, comprising a first carbon fiber sheath, a heat-collecting sheath, a second carbon fiber sheath, and a heat-dissipating sheath, which are sequentially fitted from the inside out. The heat-collecting sheath and the heat-dissipating sheath are connected by a thermally conductive structure such as a thermal bridge to achieve efficient heat transfer.
The structural strength of the rotor sheath is improved to prevent the rotor magnets from falling off and breaking. Active heat dissipation reduces the rotor temperature and prevents the magnets from demagnetizing, thereby improving the heat dissipation performance and stability of the motor.
Smart Images
Figure CN224582967U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor technology, specifically relating to a rotor sheath, rotor assembly, motor, and magnetic levitation air compressor. Background Technology
[0002] With the increasing demand for industrial automation and high-performance equipment, high-speed motors, due to their high speed, high efficiency, and compact design, have been widely used in aerospace, robotics, precision machining, and other fields. The most prominent characteristics of high-speed motors are high speed and high power density, which leads to extremely high tensile stress on the rotor during operation. This can cause the rotor magnets to loosen and break. To protect the rotor magnets and increase the stability of the motor during operation, high-speed motor rotors are often protected with alloy or carbon fiber sheaths.
[0003] Meanwhile, during operation, high-speed motors generate a significant amount of heat in the rotor, especially in the magnet area. This heat accumulation can lead to excessively high rotor temperatures. This high temperature not only affects the magnetic properties of the magnets, causing magnetic degradation and failure, but can also cause winding insulation aging, reducing the motor's reliability and lifespan. Therefore, effectively addressing the heat dissipation problem of high-speed motor rotors, even with a protective sheath, is crucial for improving their performance and extending their service life.
[0004] Traditional heat dissipation technologies mainly include air cooling and liquid cooling. Air cooling is achieved through fans or natural convection, but its efficiency is low due to the limited internal space of high-speed motors and limitations in airflow velocity and heat dissipation area. While liquid cooling has strong heat dissipation capabilities, its complex structure increases the design and maintenance costs of the motor, and the reliability and safety of liquid cooling systems face challenges in high-speed rotation environments. In recent years, carbon fiber materials, due to their high specific strength, high thermal conductivity, and high temperature resistance, have been increasingly used in the design of motor sheaths.
[0005] Existing related technologies disclose a rotor sheath comprising a first heat-diffusing layer, a shielding layer, and a second heat-diffusing layer sequentially arranged from the inside out. Both the first and second heat-diffusing layers can be carbon fiber sheaths, and the shielding layer is a metal shielding layer, such as a copper shielding layer. The rotor sheath, by designing two carbon fiber sheaths, can improve structural strength. However, the metal shielding layer itself reaches a very high temperature after shielding harmonics, and its outer side is a carbon fiber sheath with low thermal conductivity, which cannot transfer a large amount of heat to the outside of the rotor. Therefore, when a carbon fiber sheath is used to protect the rotor, how to improve its heat dissipation performance becomes a problem that needs to be solved by those skilled in the art. Utility Model Content
[0006] Therefore, this utility model provides a rotor sheath, rotor assembly, motor, and magnetic levitation air compressor, which can solve the technical problem of low heat dissipation performance when the rotor sheath is made of carbon fiber sleeve to protect the rotor in the prior art.
[0007] To address the aforementioned problems, this utility model provides a rotor sleeve comprising, from the inside out, a first carbon fiber sleeve layer, a heat-collecting sleeve layer, a second carbon fiber sleeve layer, and a heat-dissipating sleeve layer; the first carbon fiber sleeve layer has a rotor sleeve hole for mounting the rotor.
[0008] The rotor sheath further includes a heat-conducting structure for connecting the heat-collecting sheath and the heat-dissipating sheath to transfer heat from the heat-collecting sheath to the heat-dissipating sheath.
[0009] In some embodiments, the heat-conducting structure includes a heat-conducting bridge, and at least one of the axial ends of the rotor sheath is provided with the heat-conducting bridge;
[0010] Wherein, the axial end of the rotor sheath where the heat-conducting bridge is set is designated as end A, the end of the heat-collecting sleeve at end A is designated as heat-collecting end A, the end of the second carbon fiber sleeve at end A is designated as carbon fiber end A, and the end of the heat-dissipating sleeve at end A is designated as heat-dissipating end A; the heat-conducting bridge located at end A spans the carbon fiber end A and its two ends are respectively connected to the heat-collecting end A and the heat-dissipating end A.
[0011] In some embodiments, one end of the heat-conducting bridge located at end A is plugged and fixed to the heat-collecting end A; and / or, the other end of the heat-conducting bridge located at end A is plugged and fixed to the heat-dissipating end A.
[0012] In some embodiments, the A end is provided with two or more heat-conducting bridges, and each of the heat-conducting bridges located at the A end is evenly arranged along the circumference of the heat-collecting jacket.
[0013] In some embodiments, the rotor sheath is provided with the heat-conducting bridges at both axial ends, and each axial end of the rotor sheath is provided with two or more heat-conducting bridges evenly arranged circumferentially.
[0014] In some embodiments, the outer surface of the heat collection sleeve is provided with a first annular groove extending circumferentially, and a third carbon fiber sleeve is inherently fitted inside the first annular groove.
[0015] In some embodiments, the third carbon fiber sleeve does not extend radially beyond the first annular groove of the heat-collecting sleeve layer;
[0016] And / or, the number of the first annular grooves is two or more, and they are arranged sequentially at intervals along the axial direction of the heat collection sleeve; the number of the third carbon fiber sleeves is equal to the number of the first annular grooves, and they are fitted one-to-one into the corresponding first annular grooves.
[0017] In some embodiments, a second annular groove extending circumferentially is provided in the middle of the outer surface of the heat dissipation sleeve, and a fourth carbon fiber sleeve is inherently fitted inside the second annular groove.
[0018] In some embodiments, the maximum thickness of the heat dissipation sleeve is 'a', and the depth of the second annular groove is less than 'a / 2'; wherein the fourth carbon fiber sleeve does not extend radially beyond the second annular groove of the heat dissipation sleeve.
[0019] In some embodiments, the thickness of the first carbon fiber sheath is h1, the thickness of the second carbon fiber sheath is h2, and the thickness of the fourth carbon fiber sheath is h3; wherein,
[0020] h2 is greater than h1, and h2 is greater than h3;
[0021] And / or, 3 mm ≤ h1 + h2 + h3 ≤ 5 mm; and h2 ≥ 2 * h1.
[0022] This utility model also provides a rotor assembly, which includes the rotor sheath described in any one of the above-mentioned embodiments.
[0023] This utility model also provides an electric motor, which includes the rotor sheath described in any one of the above-mentioned methods; or includes the rotor assembly described in the above-mentioned methods.
[0024] This utility model also provides a magnetic levitation air compressor, which includes the rotor sleeve described in any one of the above descriptions; or includes the rotor assembly described in the above descriptions; or includes the motor described in the above descriptions.
[0025] The rotor sleeve, rotor assembly, motor, and magnetic levitation air compressor provided by this utility model have the following beneficial effects:
[0026] 1. The rotor sheath of this utility model, by employing a carbon fiber sleeve (i.e., a first carbon fiber sleeve layer and a second carbon fiber sleeve layer), can improve the structural strength of the rotor sheath. Compared with alloy sleeves, it can protect the rotor magnets during rotation without affecting the rotor's moment of inertia and inertial load, preventing them from falling off and breaking. Furthermore, through the designed heat-conducting structure, the heat absorbed by the heat-collecting sleeve layer and generated by the rotor magnets can be fully transferred to the heat-dissipating sleeve layer. This design effectively avoids the disadvantage of poor thermal conductivity of carbon fiber sleeves, simplifying the equivalent thermal network of the motor rotor (heat source to heat-collecting sleeve layer to heat-dissipating sleeve layer to air), thus improving the heat dissipation performance of the rotor sheath of this utility model.
[0027] 2. The rotor sheath of this utility model can quickly transfer the heat generated by the motor rotor under high speed and high frequency conditions to the air gap between the stator and rotor through the combined action of the heat collection layer, heat conduction structure and heat dissipation layer contained in the internal structure, thereby actively dissipating heat from the rotor and preventing the motor rotor magnets from demagnetizing due to high temperature. Attached Figure Description
[0028] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0029] Figure 1 This is an exploded view of the rotor sheath of this utility model;
[0030] Figure 2 This is an assembly diagram of the rotor sheath of this utility model;
[0031] Figure 3 This is a schematic diagram illustrating the assembly of the heat-conducting component with the heat-collecting sleeve and the heat-dissipating sleeve of this utility model;
[0032] Figure 4 This is a schematic diagram of the structure of the heat collection jacket of this utility model;
[0033] Figure 5 This is a schematic diagram showing the heat-conducting components installed on the heat-collecting jacket;
[0034] Figure 6 This is a schematic diagram of the heat dissipation jacket structure;
[0035] Figure 7 This is a schematic diagram showing the second heat dissipation hole on the heat dissipation sleeve.
[0036] The attached figures are labeled as follows:
[0037] 100. Rotor sheath; 101. First carbon fiber sleeve layer; 102. Heat collection sleeve layer; 103. Second carbon fiber sleeve layer; 104. Heat dissipation sleeve layer; 105. Fourth carbon fiber sleeve; 106. Thermal bridge; 201. First annular groove; 202. Third carbon fiber sleeve; 302. Second annular groove; 303. Second heat dissipation hole; 1011. Rotor sleeve hole; 1021. First heat dissipation hole; 1061. One end of the thermal bridge; 1062. The other end of the thermal bridge; 100a. End A; 102a. Heat collection end A; 103a. Carbon fiber end A; 104a. Heat dissipation end A. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0039] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.
[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0041] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0042] See also Figure 1-7As shown, according to an embodiment of the present invention, a rotor sleeve 100 is provided, comprising a first carbon fiber sleeve 101, a heat-collecting sleeve 102, a second carbon fiber sleeve 103, and a heat-dissipating sleeve 104, which are sequentially fitted from the inside out. The first carbon fiber sleeve 101, the heat-collecting sleeve 102, the second carbon fiber sleeve 103, and the heat-dissipating sleeve 104 are relatively fixed. Specifically, the first carbon fiber sleeve 101 and the heat-collecting sleeve 102 can be interference-fitted to maintain their relative fixation; similarly, the heat-collecting sleeve 102 and the second carbon fiber sleeve 103 can be interference-fitted to maintain their relative fixation; similarly, the second carbon fiber sleeve 103 and the heat-dissipating sleeve 104 can be interference-fitted to maintain their relative fixation.
[0043] The first carbon fiber sleeve 101 described above has a rotor sleeve hole 1011 for mounting the rotor. The rotor sheath 100 is fixed to the rotor through the rotor sleeve hole 1011 to protect the rotor magnets.
[0044] The rotor sheath 100 also includes a heat-conducting structure for connecting the heat-collecting sheath 102 and the heat-dissipating sheath 104 to transfer the heat from the heat-collecting sheath 102 to the heat-dissipating sheath 104.
[0045] In the above example, the rotor sheath 100 of this invention uses a carbon fiber sheath, namely a first carbon fiber sheath layer 101 and a second carbon fiber sheath layer 103, which improves the structural strength of the rotor sheath 100. Compared with an alloy sheath, it can protect the rotor magnets during rotation without affecting the rotor's moment of inertia and inertial load, preventing them from falling off and breaking. However, due to the low thermal conductivity of the carbon fiber sheath, the heat dissipation performance of the rotor sheath 100 is relatively low. To address this deficiency, this invention adopts a layered embedded design for the original carbon fiber rotor sheath. The layered carbon fiber sheath changes from the original single carbon fiber bundle winding structure to: a first carbon fiber sheath layer 101 + a heat collection sheath layer 102, a second carbon fiber sheath layer 103, and a heat dissipation sheath layer 104. The heat-collecting sleeve 102 can be made of materials with high specific heat capacity and low density, such as cast aluminum alloy or magnesium alloy, making it easy to process and with good heat absorption performance. The heat-dissipating sleeve 104 can be made of materials with excellent thermal conductivity and low density, such as graphene, phase change paraffin coating, titanium alloy, beryllium alloy, and other related materials. Through the designed heat-conducting structure, the heat absorbed by the heat-collecting sleeve 102 and generated by the rotor magnet can be fully transferred to the heat-dissipating sleeve 104. This design can effectively avoid the disadvantage of poor thermal conductivity of carbon fiber sheaths and simplify the equivalent thermal network of the motor rotor (heat source to heat-collecting sleeve 102 to heat-dissipating sleeve 104 to air), thereby improving the heat dissipation performance of the rotor sheath 100 of this utility model.
[0046] The rotor sheath 100 of this invention can quickly transfer the heat generated by the motor rotor under high speed and high frequency conditions to the air gap between the stator and rotor through the combined action of the heat collection sheath 102, the heat conduction structure and the heat dissipation sheath 104 contained in the internal structure, thereby actively dissipating heat from the rotor and preventing the motor rotor magnets from demagnetizing due to high temperature.
[0047] The technical solution of this utility model can also overcome the defect of existing air-cooling technology in providing cooling for motors, which cannot effectively cool the magnets under the sheathed rotor. The technical solution of this utility model solves the problem of poor thermal conductivity caused by the use of carbon fiber sleeves in existing rotor sheaths; it also solves the problem that high-speed motor rotors cannot actively dissipate heat when protected by rotor sheaths; and it also solves the problem of excessively rapid heating of rotor magnets due to large air gap harmonics in high-speed motors, which leads to magnet demagnetization and decreased rotor stability.
[0048] To achieve the function of the aforementioned heat-conducting structure, in some embodiments, such as Figure 3 As shown, the heat-conducting structure may include a heat-conducting bridge 106, which is provided at least one of the two axial ends of the rotor sleeve 100. For ease of description, the axial end of the rotor sleeve 100 where the heat-conducting bridge 106 is located is designated as end A 100a; the end of the heat-collecting sleeve 102 at end A 100a is designated as heat-collecting end A 102a; the end of the second carbon fiber sleeve 103 at end A 100a is designated as carbon fiber end A 103a; and the end of the heat-dissipating sleeve 104 at end A 100a is designated as heat-dissipating end A 104a. The heat-conducting bridge 106 located at end A 100a spans the carbon fiber end A 103a and connects to the heat-collecting end A 102a and the heat-dissipating end A 104a at its two ends.
[0049] In the above example, the design of the heat-conducting bridge 106 can bypass the second carbon fiber sheath 103 for heat transfer and transfer the heat from the heat-collecting sheath 102 to the heat-dissipating sheath 104. This can reduce the thermal resistance in the rotor thermal circuit under the traditional carbon fiber sheath, thereby increasing the heat exchange efficiency of the rotor magnets and ensuring that the rotor magnets will not demagnetize due to excessive temperature.
[0050] In order to connect the two ends of the heat-conducting bridge 106 to the aforementioned heat-collecting end A 102a and heat-dissipating end A 104a respectively, in some embodiments, one end of the heat-conducting bridge 106 located at end A 100a can be plugged and fixed to the heat-collecting end A 102a. And / or, the other end of the heat-conducting bridge 106 located at end A 100a can be plugged and fixed to the heat-dissipating end A 104a.
[0051] Among them, such as Figure 5As shown, the heat collector A end 102a can be provided with a first heat dissipation hole 1021. One end of the thermal bridge 106 located at the A end 100a can be cold-installed into the first heat dissipation hole 1021 to achieve an interference fit with the first heat dissipation hole 1021. Similarly, as Figure 7 As shown, the heat dissipation end A 104a may be provided with a second heat dissipation hole 303, and the other end of the thermal bridge 106 located at end A 100a may be cold-installed into the second heat dissipation hole 303 to make an interference fit with the second heat dissipation hole 303.
[0052] In a specific application example, the aforementioned thermal bridge 106 can be U-shaped.
[0053] In some implementations, such as Figure 2-4 The aforementioned end A 100a may be provided with two or more thermal bridges 106, and the thermal bridges 106 located at end A 100a are evenly arranged along the circumference of the heat collecting jacket 102. In this way, by providing more thermal bridges 106 at end A 100a, the heat transfer efficiency between the heat collecting jacket 102 and the heat dissipation jacket 104 can be improved.
[0054] In some implementations, such as Figure 4 As shown, the aforementioned heat-conducting bridges 106 can be provided at both axial ends of the rotor sheath 100, and each axial end of the rotor sheath 100 is provided with two or more heat-conducting bridges 106 evenly arranged in the circumferential direction. In this way, by designing multiple heat-conducting bridges 106 at both axial ends of the rotor sheath 100, the heat transfer efficiency between the heat-collecting jacket 102 and the heat-dissipating jacket 104 can be further improved.
[0055] In some embodiments, the thermal bridges 106 at both axial ends of the aforementioned rotor sheath 100 can be arranged symmetrically.
[0056] In some implementations, such as Figure 4 As shown, the outer surface of the aforementioned heat-collecting sleeve 102 may be provided with a first annular groove 201 extending circumferentially, and a third carbon fiber sleeve 202 is inherently fitted inside the first annular groove 201. By embedding the third carbon fiber sleeve 202 inside the heat-collecting sleeve 102, the structural strength of the heat-collecting sleeve 102 can be improved, which is beneficial to improving the protective performance of the rotor sheath 100 of this utility model against the rotor magnets.
[0057] In some embodiments, the aforementioned third carbon fiber sleeve 202 does not protrude above the first annular groove 201 in the radial direction of the heat collecting sleeve layer 102. Preferably, the thickness of the third carbon fiber sleeve 202 is consistent with the depth of the annular groove, so that the outer surface of the third carbon fiber sleeve 202 is flush with the outer surface of the heat collecting sleeve layer 102.
[0058] In some implementations, such as Figure 4As shown, the aforementioned first annular grooves 201 can be two or more, and are arranged sequentially at intervals along the axial direction of the heat-collecting sleeve 102. The number of third carbon fiber sleeves 202 is equal to the number of first annular grooves 201, and they are fitted one-to-one into the corresponding first annular grooves 201. By embedding a greater number of third carbon fiber sleeves 202 within the heat-collecting sleeve 102, the structural strength of the heat-collecting sleeve 102 can be further improved, which is beneficial for further enhancing the protective performance of the rotor sheath 100 for the rotor magnets.
[0059] In some implementations, such as Figure 6 As shown, a second annular groove 302 extending circumferentially may be provided in the middle of the outer surface of the aforementioned heat dissipation sleeve 104, and a fourth carbon fiber sleeve 105 is inherently fitted inside the second annular groove 302. By embedding a greater number of fourth carbon fiber sleeves 105 within the heat dissipation sleeve 104, the structural strength of the heat dissipation sleeve 104 can be improved, which is beneficial for further enhancing the protective performance of the rotor sheath 100 for the rotor magnets.
[0060] In some embodiments, the maximum thickness of the aforementioned heat dissipation sleeve 104 can be 'a', and the depth of the aforementioned second annular groove 302 is less than 'a / 2'. The fourth carbon fiber sleeve 105 does not protrude above the second annular groove 302 in the radial direction of the heat dissipation sleeve 104, thereby providing protection for the heat dissipation sleeve 104. Preferably, the thickness of the fourth carbon fiber sleeve 105 is the same as the depth of the second annular groove 302, so that the outer surface of the fourth carbon fiber sleeve 105 is flush with the outer surface of the heat dissipation sleeve 104.
[0061] In some embodiments, the thickness of the first carbon fiber sheath 101 is h1, the thickness of the second carbon fiber sheath 103 is h2, and the thickness of the fourth carbon fiber sheath 105 is h3. Wherein, h2 is greater than h1 and h3, thus maximizing the thickness of the second carbon fiber sheath 103 and covering the largest area of the entire rotor. Therefore, its ability to influence heat conduction (heat dissipation) is also the strongest. Thus, the design of the thermal bridge can avoid the influence of the second carbon fiber sheath 103 on rotor heat dissipation.
[0062] It should be noted that although the first carbon fiber sleeve 101 does not have a thermal bridge (due to the rotor size), because it is closest to the rotor heat source (magnet) and has a small thickness, most of the heat can be transferred to the heat-collecting sleeve 102. Therefore, the first carbon fiber sleeve 101 has little impact on the cooling effect. Furthermore, the fourth carbon fiber sleeve 105 is the outermost layer of the rotor sheath 100, and because it is partially encased by the heat dissipation sleeve 104, it will have a better heat dissipation effect.
[0063] In some implementations, 3 mm ≤ h1 + h2 + h3 ≤ 5 mm; and h2 ≥ 2 * h1.
[0064] In the above example, by making 3 mm ≤ h1 + h2 + h3 ≤ 5 mm, the thickness of the layered carbon fiber sheath of this utility model is kept consistent with the thickness of the existing integrated carbon fiber sheath. By making h2 ≥ 2 * h1, the thickness of the first carbon fiber sheath 101 is reduced as much as possible, thereby reducing the resistance to heat transfer from the first carbon fiber sheath 101 to the heat collecting sheath 102 and improving the heat collecting effect of the heat collecting sheath 102.
[0065] In some embodiments, the maximum thickness of the aforementioned heat-collecting sleeve 102 can be h4, and the maximum thickness of the aforementioned heat-dissipating sleeve 104 can be a. The thicknesses of both the heat-collecting sleeve 102 and the heat-dissipating sleeve 104 need to be determined based on the rotor temperature rise. Preferably, h4 = a = h2 / 2.
[0066] In some embodiments, the present invention also provides a rotor assembly, which may include the rotor sheath 100 of any of the above.
[0067] In some embodiments, the present invention also provides an electric motor, which may include the rotor sheath 100 of any of the above; or include the rotor assembly of the above.
[0068] In some embodiments, the present invention also provides a magnetic levitation air compressor, which may include the rotor sleeve 100 of any of the above; or include the rotor assembly of the above; or include the motor of the above.
[0069] For ease of understanding, the overall structure of this utility model will be described below, and its working principle will be explained.
[0070] The rotor sheath 100 of this utility model includes a first carbon fiber sheath 101, a heat collection sheath 102, a second carbon fiber sheath 103, a heat dissipation sheath 104, a heat conduction bridge 106, and a fourth carbon fiber sheath 105.
[0071] The first carbon fiber sheath 101, the second carbon fiber sheath 103, the third carbon fiber sheath 202, and the fourth carbon fiber sheath 105 are all composed of carbon fiber bundles and epoxy resin adhesive. The heat collecting sheath 102 is made of materials with high specific heat capacity and low density, such as cast aluminum alloy or magnesium alloy; while the thermal bridge 106 and the heat dissipation sheath 104 are made of materials with excellent thermal conductivity and low density, such as graphene, phase change paraffin coating, titanium alloy, beryllium alloy, and other related materials.
[0072] To fulfill the basic protective function of the rotor sheath 100 of this utility model for the high-speed motor rotor, carbon fiber strips are first wound onto the rotor to a predetermined thickness d to form a first carbon fiber sheath 101. The rotor and the first carbon fiber sheath 101 are assembled by interference fit. Then, the heat collection sheath 102 is assembled with the first carbon fiber sheath 101 by interference fit. Since the material of the heat collection sheath 102 is not a high-strength material such as tensile strength, a uniform first annular groove 201 is cut on its outer surface by grooving. Then, a portion of the carbon fiber strip is nested and wound into the first annular groove 201 to increase the mechanical stability of the heat collection sheath 102 under high-speed rotation. The carbon fiber strip nested in the first annular groove 201 forms a third carbon fiber sheath 202. The thickness of the third carbon fiber sheath 202 only needs to be the same as the depth of the first annular groove 201. Then, a second carbon fiber sleeve 103 is wound around the outer circumference of the heat-collecting sleeve 102 to increase the protection of the rotor by the rotor sheath 100. The thickness of the second carbon fiber sleeve 103 is b, and the assembly method is interference fit. On this basis, a heat dissipation sleeve 104 with a thickness of a is fitted onto the outer surface of the second carbon fiber sleeve 103. The two are assembled using interference fit. In this step, the heat-conducting bridge 106 needs to be cold-fitted into the first heat dissipation hole 1021 of the heat-collecting sleeve 102 using the principle of thermal expansion and contraction, and its other end needs to be cold-fitted into the second heat dissipation hole 303 of the heat dissipation sleeve 104. At this time, the main part of the active heat absorption and heat dissipation function of the rotor sheath 100 of this utility model has been assembled. To ensure the heat dissipation sleeve 104 is not damaged during high-speed rotation, assembly areas for the heat-conducting bridge 106 are reserved at both ends of the heat dissipation sleeve 104 along its axial direction. Simultaneously, a second annular groove 302 is precision-machined on its outer circumference, with a depth less than a / 2. A fourth carbon fiber sleeve 105 is then embedded within the second annular groove 302 to protect the heat dissipation sleeve 104. The thickness of the fourth carbon fiber sleeve 105 must be equal to the depth of the second annular groove 302. This completes the fabrication of the rotor sleeve 100 of this invention.
[0073] In this invention, the rotor sheath 100 can actively cool the rotor magnets by means of the heat-collecting sleeve layer 102 while ensuring the protection performance of the rotor magnets. Due to the high thermal resistance and low thermal conductivity of traditional carbon fiber sheaths, this invention optimizes and simplifies the equivalent thermal network of the motor rotor during operation through a special carbon fiber sheath structure design. The design of the heat-conducting bridge 106 avoids the carbon fiber sheath by transferring heat, reducing the thermal resistance in the rotor thermal circuit under traditional carbon fiber sheaths, thereby increasing the heat exchange efficiency of the magnets and ensuring that the magnets will not demagnetize due to excessive temperature. At the same time, the rotor sheath 100 structure of this invention does not change the performance of the original rotor sheath, and the newly added heat-collecting sleeve layer 102 and heat-dissipating sleeve layer 104 are both low-density materials, which are easy to process and do not affect the rotor's inertial load and moment of inertia.
[0074] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.
[0075] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A rotor can (100) characterized by: It includes a first carbon fiber sleeve (101), a heat collection sleeve (102), a second carbon fiber sleeve (103), and a heat dissipation sleeve (104) that are sequentially fitted from the inside out; the first carbon fiber sleeve (101) has a rotor sleeve hole (1011) for fitting the rotor. The rotor sheath (100) further includes a heat-conducting structure for connecting the heat-collecting sheath (102) and the heat-dissipating sheath (104) to transfer the heat from the heat-collecting sheath (102) to the heat-dissipating sheath (104).
2. The rotor sheath (100) according to claim 1, characterized in that: The heat-conducting structure includes a heat-conducting bridge (106), and at least one of the two axial ends of the rotor sheath (100) is provided with the heat-conducting bridge (106); Wherein, the axial end of the rotor sheath (100) where the heat-conducting bridge (106) is set is end A (100a), the end of the heat-collecting sleeve (102) at end A (100a) is end A (102a), the end of the second carbon fiber sleeve (103) at end A (100a) is end A (103a), and the end of the heat-dissipating sleeve (104) at end A (100a) is end A (104a); the heat-conducting bridge (106) located at end A (100a) spans the carbon fiber end A (103a) and its two ends are respectively connected to end A (102a) and end A (104a).
3. The rotor sheath (100) according to claim 1, characterized in that: One end of the heat-conducting bridge (106) located at the A end (100a) is inserted and fixed to the heat-collecting A end (102a); and / or, the other end of the heat-conducting bridge (106) located at the A end (100a) is inserted and fixed to the heat-dissipating A end (104a).
4. The rotor sheath (100) according to claim 2 or 3, characterized in that: The A end (100a) is provided with two or more of the heat-conducting bridges (106), and each of the heat-conducting bridges (106) located at the A end (100a) is evenly arranged along the circumference of the heat-collecting jacket (102).
5. The rotor sheath (100) according to claim 2 or 3, characterized in that: The rotor sheath (100) is provided with heat-conducting bridges (106) at both axial ends, and each axial end of the rotor sheath (100) is provided with two or more heat-conducting bridges (106) evenly arranged circumferentially.
6. The rotor sheath (100) according to any one of claims 1-3, characterized in that: The outer surface of the heat collection sleeve (102) is provided with a first annular groove (201) extending in the circumferential direction, and a third carbon fiber sleeve (202) is inherently fitted inside the first annular groove (201).
7. The rotor sheath (100) according to claim 6, characterized in that: The third carbon fiber sleeve (202) does not extend beyond the first annular groove (201) in the radial direction of the heat collection sleeve layer (102); And / or, the number of the first annular grooves (201) is two or more, and they are arranged sequentially at intervals along the axial direction of the heat collection sleeve (102); the number of the third carbon fiber sleeves (202) is equal to the number of the first annular grooves (201), and they are fitted one-to-one in the corresponding first annular grooves (201).
8. The rotor sheath (100) according to any one of claims 1-3 and 7, characterized in that: The outer surface of the heat dissipation sleeve (104) is provided with a second annular groove (302) extending circumferentially in the middle, and a fourth carbon fiber sleeve (105) is inherently fitted inside the second annular groove (302).
9. The rotor sheath (100) according to claim 8, characterized in that: The maximum thickness of the heat dissipation sleeve (104) is a, and the depth of the second annular groove (302) is less than a / 2; wherein the fourth carbon fiber sleeve (105) does not extend beyond the second annular groove (302) in the radial direction of the heat dissipation sleeve (104).
10. The rotor can (100) of claim 8, characterized in that: The thickness of the first carbon fiber sheath (101) is h1, the thickness of the second carbon fiber sheath (103) is h2, and the thickness of the fourth carbon fiber sheath (105) is h3; wherein, h2 is greater than h1, and h2 is greater than h3; And / or, 3 mm ≤ h1 + h2 + h3 ≤ 5 mm; and h2 ≥ 2 * h1.
11. A rotor assembly characterized by: Includes the rotor sheath (100) according to any one of claims 1-10.
12. An electric machine characterized by: It includes the rotor sheath (100) as described in any one of claims 1-10; or it includes the rotor assembly as described in claim 11.
13. A magnetic levitation air compressor, characterized by: It includes the rotor sheath (100) of any one of claims 1-10; or the rotor assembly of claim 11; or the motor of claim 12.