A magnetic levitation bearing and a magnetic levitation rotating machine
By designing radial extensions and air channels in the magnetic levitation bearing system, active gas cooling is achieved, solving the problem of poor heat dissipation in the bearing system and improving cooling efficiency and system reliability.
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
The heat dissipation effect of the existing high-speed motor rotor axial magnetic levitation bearing system is poor, resulting in excessively high temperature, which affects the levitation accuracy and adjustment response performance, and may even cause mechanical collision.
Design a magnetic levitation bearing system, including an axial bearing core and a thrust disk. By setting radial extensions and air channels on the core and thrust disk, gaps and cavities are formed, and active heat dissipation is achieved by using gas cooling.
It improves the cooling and heat dissipation effect of the bearing system, reduces the temperature, ensures suspension accuracy and response performance, avoids mechanical collisions, and extends service life.
Smart Images
Figure CN224579636U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of magnetic levitation bearing technology, specifically to a magnetic levitation bearing and a magnetic levitation rotating machine. Background Technology
[0002] High-speed motors typically use magnetic or air bearings to suspend the rotor, effectively reducing mechanical friction and heat generation. This also eliminates the need for lubrication and oil contamination, significantly increasing the motor's critical speed and extending its lifespan. The axial movement of the high-speed motor rotor is controlled using magnetic axial bearings to maintain the rotor shaft at its axial center. The thrust plate, with its interference fit to the rotor shaft, experiences significant eddy current losses due to the alternating magnetic field generated by the axial magnetic bearings during rotor position adjustments. This generates substantial heat, which, combined with the heat conducted from the rotor itself, further intensifies the temperature of the thrust plate. Therefore, heat dissipation of the axial magnetic bearing system is a major research focus in high-speed motor rotor thermal management.
[0003] When existing high-speed motor rotor axial magnetic levitation bearing systems are cooled by air, the temperature of the axial magnetic bearing system is very high due to its location inside the motor, the friction from high-speed rotation, and the alternating electromagnetic field. In some cases, the high temperature of the axial magnetic bearing system seriously affects its levitation accuracy and adjustment response performance, and may even cause high-speed rotor axial mechanical collisions, resulting in the scrapping of the axial magnetic levitation bearing system and the entire rotor shaft.
[0004] Because existing axial magnetic levitation bearing systems suffer from poor heat dissipation, this invention researches and designs a magnetic levitation bearing and a magnetic levitation rotating machine. Utility Model Content
[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defect of poor heat dissipation in the structure of the axial magnetic levitation bearing system in the prior art, thereby providing a magnetic levitation bearing and magnetic levitation rotating machinery.
[0006] To solve the above problems, this utility model provides a magnetic levitation bearing, which includes:
[0007] The magnetic levitation bearing comprises an axial bearing core one, an axial bearing core two, and a thrust disk. In the axial direction of the magnetic levitation bearing, the thrust disk is disposed between the axial bearing core one and the axial bearing core two, and the rotor shaft passes through the inner circumference of the axial bearing core one, the inner circumference of the axial bearing core two, and the inner circumference of the thrust disk.
[0008] The axial bearing core includes a radially outer portion, a radially inner portion, and an axially outer portion. Along the radial direction of the axial bearing core, the radially outer portion is located radially outside the radially inner portion. One axial end of the radially outer portion is connected to the axially outer portion, and the other axial end is opposite to the thrust plate. One axial end of the radially inner portion is connected to the axially outer portion, and the other axial end is opposite to the thrust plate.
[0009] A coil groove is formed between the radially outer portion one, the radially inner portion one, and the axially outer portion one, and a coil one is disposed in the coil groove one.
[0010] Furthermore, the axial outer portion one extends radially inward at the position where it connects with the radial inner portion one to form a radial extension portion one. The minimum distance between the radial extension portion one and the rotor shaft along the radial direction is less than the minimum distance between the radial inner portion one and the rotor shaft. There is a first gap between the radial extension portion one and the rotor shaft. The radial extension portion one, the radial inner portion one, the thrust disk and the rotor shaft form a first cavity, allowing gas to enter the first cavity through the first gap.
[0011] In some implementations...
[0012] A first gap is also provided between the axial bearing core and the thrust disk. The first cavity communicates with the first gap so that gas can be introduced between the axial bearing core and the thrust disk. The first gap includes the gap between the radially outer portion and the thrust disk and the gap between the radially inner portion and the thrust disk.
[0013] In some implementations...
[0014] The thrust disk includes a thrust disk end face facing the axial bearing core. A first hole is formed on the thrust disk end face towards the interior of the thrust disk. An air guide channel is formed inside the thrust disk. One end of the first hole is on the thrust disk end face to communicate with the first gap. The other end of the first hole extends into the air guide channel to communicate with the air guide channel. The radially outer end of the air guide channel extends to the radially outer peripheral surface of the thrust disk.
[0015] In some implementations...
[0016] The thrust disk has a shaft hole that accommodates the rotor shaft. One end of the air guide channel is spaced apart from the shaft hole by a first distance, and the other end of the air guide channel is located on the radial outer circumferential surface of the thrust disk. The minimum distance between the shaft hole and the outer circumferential surface of the thrust disk is a second distance. The first distance is greater than 0 and less than the second distance. The extension direction of the air guide channel is along the radial direction of the thrust disk or at an angle between (0° and 90°) and the radial direction of the thrust disk.
[0017] In some implementations...
[0018] There are multiple air guide channels, which are distributed at intervals along the circumferential direction of the thrust plate inside the thrust plate, and each air guide channel is connected to multiple first holes.
[0019] In some implementations...
[0020] The axial bearing core two includes a radially outer portion two, a radially inner portion two, and an axially outer portion two. Along the radial direction of the axial bearing core two, the radially outer portion two is located radially outer of the radially inner portion two. One axial end of the radially outer portion two is connected to the axially outer portion two, and the other axial end is opposite to the thrust plate. One axial end of the radially inner portion two is connected to the axially outer portion two, and the other axial end is opposite to the thrust plate.
[0021] A coil groove is formed between the second radially outer portion, the second radially inner portion, and the second axially outer portion, and a coil is disposed in the second coil groove.
[0022] Furthermore, the axial outer portion two extends radially inward at the position where it connects with the radial inner portion two to form a radial extension portion two. The minimum distance between the radial extension portion two and the rotor shaft along the radial direction is less than the minimum distance between the radial inner portion two and the rotor shaft. There is a second gap between the radial extension portion two and the rotor shaft. The radial extension portion two, the radial inner portion two, the thrust disk and the rotor shaft form a second cavity, allowing gas to enter the second cavity through the second gap.
[0023] In some implementations...
[0024] A second gap is also provided between the second axial bearing core and the thrust disk. The second cavity communicates with the second gap so that gas can be introduced between the second axial bearing core and the thrust disk. The second gap includes the gap between the second radially outer portion and the thrust disk, and the gap between the second radially inner portion and the thrust disk.
[0025] In some implementations...
[0026] The thrust disk includes a second thrust disk end face facing the second axial bearing core. A second hole is formed on the second thrust disk end face towards the interior of the thrust disk. An air guide channel is formed inside the thrust disk. One end of the second hole is on the second thrust disk end face to communicate with the second gap. The other end of the second hole extends into the air guide channel to communicate with the air guide channel. The radially outer end of the air guide channel extends to the radially outer peripheral surface of the thrust disk.
[0027] In some implementations...
[0028] There are multiple air guide channels, which are distributed at intervals along the circumferential direction of the thrust disk inside the thrust disk, and each air guide channel is connected to multiple second holes.
[0029] This utility model also provides a magnetically levitated rotating machine, which includes the aforementioned magnetically levitated bearing and a rotor shaft, the rotor shaft passing through the inner circumference of the first axial bearing core, the inner circumference of the second axial bearing core, and the inner circumference of the thrust disk.
[0030] The magnetic levitation bearing and magnetic levitation rotating machinery provided by this utility model have the following beneficial effects:
[0031] 1. This utility model provides a radial extension portion on the radially inner side of the axial outer side of the axial bearing core, which extends towards the rotor shaft. This forms a first cavity between the radial extension portion, the radially inner side, the thrust disk, and the rotor shaft. The first gap between the radial extension portion and the rotor shaft allows gas to be drawn into the first cavity when the rotor shaft drives the thrust disk to rotate, creating a space for storing cooling gas. This prevents gas from escaping the first cavity and increases the contact area between the gas and the thrust disk and the axial bearing core, improving the cooling effect on the axial bearing core and the thrust disk. It also ensures a large amount of gas enters the internal air passage of the thrust disk, effectively solving the problem of poor heat dissipation in existing axial magnetic levitation bearing systems.
[0032] 2. This utility model also enables active air intake and heat exchange through the first hole and air guide channel on the thrust plate. Cooling gas is drawn in from the first gap and enters the thrust plate to dissipate heat, increasing the gas flow rate and accelerating the cooling of the axial magnetic bearing. It can actively cool the thrust plate itself and increase the cooling flow rate to accelerate the cooling of the axial coil, thereby improving the cooling effect on the magnetic levitation bearing.
[0033] 3. This utility model further provides a radial extension portion two on the radially inner side of the axially outer side portion two of the axial bearing core two, which can extend towards the rotor shaft. This forms a second cavity between the radial extension portion two, the radially inner side portion two, the thrust disk, and the rotor shaft. Through the second gap formed between the radial extension portion two and the rotor shaft, gas can be drawn into the second cavity from the second gap when the rotor shaft drives the thrust disk to rotate. This creates a space for storing cooling gas, preventing gas from escaping from the second cavity. It also increases the contact and heat dissipation area between the gas and the thrust disk and the axial bearing core two, improving the cooling effect on the axial bearing core two and the thrust disk. Furthermore, it ensures that a large amount of gas enters the internal air guide channel of the thrust disk, effectively solving the problem of poor heat dissipation in existing axial magnetic levitation bearing systems. Attached Figure Description
[0034] Figure 1 This is a longitudinal sectional view of the magnetic levitation bearing assembly of this utility model;
[0035] Figure 2 This is a three-dimensional and partially sectional structural diagram of the magnetic levitation bearing assembly of this utility model;
[0036] Figure 3 This is a three-dimensional structural view of the magnetic levitation bearing assembly of this utility model after longitudinal sectioning at the central axis of the rotor shaft;
[0037] Figure 4 This is a cross-sectional view of the magnetic levitation bearing assembly of this utility model, showing the air guide channel inside the thrust plate.
[0038] The reference numerals in the attached figures are as follows:
[0039] 1. Axial bearing core one; 11. Radial outer portion one; 12. Radial inner portion one; 13. Coil slot one; 14. Axial outer portion one; 15. Radial extension one; 16. First gap; 17. First cavity; 18. First clearance; 2. Axial bearing core two; 21. Radial outer portion two; 22. Radial inner portion two; 23. Coil slot two; 24. Axial outer portion two; 25. Radial extension two; 26. Second gap; 27. Second cavity; 28. Second clearance; 3. Thrust plate; 30. Shaft hole; 31. Thrust plate end face one; 32. Thrust plate end face two; 33. First hole; 34. Air guide channel; 35. Second hole; 5. Coil one; 6. Coil two; 7. Rotor shaft. Detailed Implementation
[0040] 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.
[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0043] 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.
[0044] 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.
[0045] 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.
[0046] like Figure 1-4 As shown, this utility model provides a magnetic levitation bearing, which includes:
[0047] Axial bearing core 1, axial bearing core 2, and thrust disk 3 are provided. In the axial direction of the magnetic levitation bearing, the thrust disk 3 is disposed between the axial bearing core 1 and the axial bearing core 2. The rotor shaft 7 passes through the inner circumference of the axial bearing core 1, the inner circumference of the axial bearing core 2, and the inner circumference of the thrust disk 3.
[0048] The axial bearing core 1 includes a radially outer portion 11, a radially inner portion 12, and an axially outer portion 14. Along the radial direction of the axial bearing core 1, the radially outer portion 11 is located radially outside the radially inner portion 12. One axial end of the radially outer portion 11 is connected to the axially outer portion 14, and the other axial end is opposite to the thrust disk 3. One axial end of the radially inner portion 12 is connected to the axially outer portion 14, and the other axial end is opposite to the thrust disk 3.
[0049] A coil groove 13 is formed between the radially outer portion 11, the radially inner portion 12, and the axially outer portion 14, and a coil 5 is disposed in the coil groove 13.
[0050] Furthermore, the axial outer portion 14 extends radially inward at the junction with the radial inner portion 12 to form a radial extension portion 15. The minimum distance between the radial extension portion 15 and the rotor shaft 7 along the radial direction is less than the minimum distance between the radial inner portion 12 and the rotor shaft 7. A first gap 16 exists between the radial extension portion 15 and the rotor shaft 7. The radial extension portion 15, the radial inner portion 12, the thrust disk 3, and the rotor shaft 7 form a first cavity 17, allowing gas to enter the first cavity 17 through the first gap 16.
[0051] This invention provides a radial extension portion on the radially inner side of the axial outer side of the axial bearing core, extending towards the rotor shaft. This forms a first cavity between the radial extension portion, the radially inner side, the thrust disk, and the rotor shaft. The first gap between the radial extension portion and the rotor shaft allows gas to be drawn into the first cavity when the rotor shaft drives the thrust disk to rotate, creating a space for storing cooling gas and preventing it from escaping. This also increases the contact area between the gas and the thrust disk and the axial bearing core, improving the cooling effect on both the axial bearing core and the thrust disk. Furthermore, it ensures a significant amount of gas enters the internal air passage of the thrust disk, effectively solving the problem of poor heat dissipation in existing axial magnetic levitation bearing systems.
[0052] In some implementations...
[0053] A first gap 18 is also provided between the axial bearing core 1 and the thrust disk 3. The first cavity 17 communicates with the first gap 18 so that gas can be introduced into the space between the axial bearing core 1 and the thrust disk 3. The first gap 18 includes the gap between the radially outer portion 11 and the thrust disk 3, and the gap between the radially inner portion 12 and the thrust disk 3.
[0054] This invention also utilizes the aforementioned first gap between the axial bearing core and the thrust plate, which includes the gap between the radially outer portion and the thrust plate, and the gap between the radially inner portion and the thrust plate. This allows the cooling and heat dissipation gas in the first cavity to enter the space between the radially inner portion and the thrust plate, the coil slot, and the radially outer portion and the thrust plate, respectively. This effectively increases the surface contact area of the gas with the axial bearing core and the thrust plate, further improving the cooling and heat dissipation effect on the axial bearing core and the thrust plate.
[0055] In some implementations...
[0056] The thrust disk 3 includes a thrust disk end face 31 facing the axial bearing core 1. A first hole 33 is formed on the thrust disk end face 31 towards the interior of the thrust disk 3. An air guide channel 34 is formed inside the thrust disk 3. One end of the first hole 33 is on the thrust disk end face 31 to communicate with the first gap 18. The other end of the first hole 33 extends into the air guide channel 34 to communicate with the air guide channel 34. The radially outer end of the air guide channel 34 extends to the radially outer peripheral surface of the thrust disk 3.
[0057] This invention also utilizes the first hole and air passage on the thrust plate to achieve active air intake and heat exchange at high speed. Cooling gas is drawn in from the first gap and enters the thrust plate to dissipate heat, increasing the gas flow rate and accelerating the cooling of the axial magnetic bearing. This actively cools the thrust plate itself and increases the cooling flow rate to accelerate the cooling of the axial coil, thereby improving the cooling effect on the magnetic levitation bearing.
[0058] Invention Point 1: This utility model preferably features a T-shaped step (radial extensions one and two) designed at the inner hole of the iron core. After assembly with the rotor shaft, this T-shaped step forms an axial channel for cold air entry (first and second gaps) and a T-shaped storage space for cold air (first and second cavities), while simultaneously not contacting the rotor shaft, allowing the rotor shaft to float within it; (e.g.) Figure 1 The axial bearing core of this utility model is preferably made of magnetically conductive metal such as 45# steel.
[0059] Invention Point 2: Preferably, the thrust plate of this invention has arranged holes (first hole and second hole) on both axial end faces, allowing cold air to enter the interior of the thrust plate through these holes; simultaneously, an air guide channel is designed in the radial direction of the thrust plate, and this air guide channel is connected to the first and second holes in the axial direction of the end faces, forming a complete channel. (e.g.) Figure 2 The thrust disc of this invention uses a hole to remove part of its mass, which can also reduce the weight of the rotor and reduce the rotor's moment of inertia.
[0060] In this invention, cold air from outside the magnetic levitation bearing enters the T-shaped chamber (first and second cavities) of the axial bearing core along the rotor shaft, then enters the interior of the thrust plate through the gap between the thrust plate end and the magnetic end face of the axial bearing core (first and second gaps), and flows out through the radial through hole (air guide channel) of the thrust plate, thereby carrying away the heat from the rotor shaft, the axial bearing core, and the thrust plate, cooling the entire axial bearing system, and effectively improving the reliability of the product.
[0061] Point 3 of the invention: The thrust disc of this invention is preferably assembled with the rotor shaft using an interference fit, so that the thrust disc is fixed on the rotor shaft. When the thrust disc rotates at high speed with the rotor shaft, the centrifugal force causes air to flow, cooling the entire axial bearing system. This heat dissipation function automatically activates with rotor rotation, avoiding the problem of passive heat dissipation failure. At the same time, the heat dissipation effect increases with the rotational speed, and the heat dissipation efficiency is higher, further improving product reliability.
[0062] This invention designs a self-heating axial magnetic levitation bearing system structure, which can solve the problem of temperature rise in axial magnetic levitation bearing systems, without increasing the axial length and processing difficulty of the axial magnetic levitation system, ensuring that the heat dissipation effect is improved and the reliability of the axial bearing system is improved while meeting the rotor dynamic performance requirements.
[0063] In some implementations...
[0064] The thrust disk 3 has a shaft hole 30 through which the rotor shaft 7 passes. One end of the air guide channel 34 is spaced apart from the shaft hole 30 by a first distance, and the other end of the air guide channel 34 is located on the radial outer circumferential surface of the thrust disk 3. The minimum distance between the shaft hole 30 and the outer circumferential surface of the thrust disk 3 is a second distance. The first distance is greater than 0 and less than the second distance. The extension direction of the air guide channel 34 is along the radial direction of the thrust disk 3 or at an angle between (0° and 90°) and the radial direction of the thrust disk 3.
[0065] This is a preferred structural form of the air guide channel of the present invention, wherein one end of the channel is spaced at a first distance greater than 0 from the shaft hole, and the other end extends to the radial outer circumferential surface. The first and second holes can be opened at any position from the radial inner side to the radial outer side of the thrust plate and can be connected to the air guide channel, thereby increasing the gas conduction area and improving the cooling and heat dissipation performance of the thrust plate.
[0066] In some implementations...
[0067] There are multiple air guide channels 34, which are distributed at intervals along the circumferential direction inside the thrust disk 3, and each air guide channel 34 is connected to multiple first holes 33.
[0068] This is a further preferred structural form of the air guiding channel of this utility model. By having multiple air guiding channels distributed along the circumference, the gas guiding area in the circumferential direction can be increased, thereby improving the cooling and heat dissipation performance of the thrust disk. Furthermore, the gas will flow through almost all surfaces of the axial bearing core in the radial direction, thereby improving the cooling and heat dissipation performance of the axial bearing core.
[0069] In some implementations...
[0070] The axial bearing core 2 includes a radially outer portion 21, a radially inner portion 22, and an axially outer portion 24. Along the radial direction of the axial bearing core 2, the radially outer portion 21 is located radially outside the radially inner portion 22. One axial end of the radially outer portion 21 is connected to the axially outer portion 24, and the other axial end is opposite to the thrust plate 3. One axial end of the radially inner portion 22 is connected to the axially outer portion 24, and the other axial end is opposite to the thrust plate 3.
[0071] The radially outer portion 21, the radially inner portion 22, and the axially outer portion 24 form a coil groove 23, and a coil 6 is disposed in the coil groove 23.
[0072] Furthermore, the axial outer portion 24 extends radially inward at the junction with the radial inner portion 22 to form a radial extension portion 25. The minimum distance between the radial extension portion 25 and the rotor shaft 7 along the radial direction is less than the minimum distance between the radial inner portion 22 and the rotor shaft 7. A second gap 26 exists between the radial extension portion 25 and the rotor shaft 7. The radial extension portion 25, the radial inner portion 22, the thrust disk 3, and the rotor shaft 7 form a second cavity 27, allowing gas to enter the second cavity 27 through the second gap 26.
[0073] This invention further provides a radial extension portion two on the radially inner side of the axially outer side portion two of the axial bearing core two, which extends towards the rotor shaft. This forms a second cavity between the radial extension portion two, the radially inner side portion two, the thrust disk, and the rotor shaft. Through the second gap formed between the radial extension portion two and the rotor shaft, gas can be drawn into the second cavity when the rotor shaft drives the thrust disk to rotate, thus creating a space for storing cooling gas, preventing gas from escaping from the second cavity, and increasing the contact and heat dissipation area between the gas and the thrust disk and the axial bearing core two, respectively. This improves the cooling and heat dissipation effect on the axial bearing core two and the thrust disk, and ensures that a large amount of gas enters the internal air guide channel of the thrust disk, effectively solving the problem of poor heat dissipation in existing axial magnetic levitation bearing systems.
[0074] In some implementations...
[0075] A second gap 28 is also provided between the axial bearing core 2 and the thrust disk 3. The second cavity 27 communicates with the second gap 28 so as to introduce gas into the space between the axial bearing core 2 and the thrust disk 3. The second gap 28 includes the gap between the radial outer portion 21 and the thrust disk 3 and the gap between the radial inner portion 22 and the thrust disk 3.
[0076] This invention also utilizes the aforementioned second gap between the axial bearing core and the thrust plate, which includes the gap between the radially outer portion and the thrust plate, and the gap between the radially inner portion and the thrust plate. This allows the cooling gas in the second cavity to enter the space between the radially inner portion and the thrust plate, the coil slot, and the radially outer portion and the thrust plate, respectively. This effectively increases the surface contact area of the gas with the axial bearing core and the thrust plate, further improving the cooling effect on the axial bearing core and the thrust plate.
[0077] In some implementations...
[0078] The thrust disk 3 includes a thrust disk end face 32 facing the axial bearing core 2. A second hole 35 is formed on the thrust disk end face 32 towards the interior of the thrust disk 3. An air guide channel 34 is formed inside the thrust disk 3. One end of the second hole 35 is on the thrust disk end face 32 to communicate with the second gap 28. The other end of the second hole 35 extends into the air guide channel 34 to communicate with the air guide channel 34. The radially outer end of the air guide channel 34 extends to the radially outer peripheral surface of the thrust disk 3.
[0079] This invention also utilizes a second hole and air passage on the thrust plate to achieve active air intake and heat exchange at high speed. Cooling gas is drawn in from the second gap and introduced into the thrust plate to dissipate heat, increasing the gas flow rate and accelerating the cooling of the axial magnetic bearing. This actively cools the thrust plate itself and increases the cooling flow rate to accelerate the cooling of the axial coil, thereby improving the cooling effect on the magnetic levitation bearing.
[0080] In some implementations...
[0081] There are multiple air guide channels 34, which are distributed at intervals along the circumferential direction inside the thrust disk 3, and each air guide channel 34 is connected to multiple second holes 35.
[0082] This is a further preferred structural form of the air guiding channel of this utility model. By having multiple air guiding channels distributed along the circumference, the gas guiding area in the circumferential direction can be increased, improving the cooling and heat dissipation performance of the thrust disk. Furthermore, the gas will flow through almost all surfaces of the axial bearing core in the radial direction, thereby improving the cooling and heat dissipation performance of the axial bearing core.
[0083] This utility model designs a self-heating axial magnetic levitation bearing structure (see...). Figure 1Preferably, the axial bearing core is made of a magnetically conductive material (such as 45# steel), and the axial bearing core is machined with a T-shaped through-hole stepped groove (through the first gap and first cavity formed by radial extensions one and two, as well as the second gap and second cavity).
[0084] After being assembled with the rotor shaft, this T-shaped step forms an axial channel for cold air entry and a T-shaped storage space for cold air, while remaining in contact with the rotor shaft, allowing the rotor shaft to float within it. Simultaneously, a groove is machined in the middle of the iron core to accommodate the magnetic bearing winding coil. Preferably, a winding bobbin is used for winding the coil, and motor insulating varnish is used to fix the entire winding coil and winding bobbin to the corresponding groove in the axial bearing iron core (e.g., ...). Figure 1 The thrust plate has holes (first and second holes) on both axial end faces, allowing cold air to enter the interior of the thrust plate. Simultaneously, a venting channel is designed in the radial direction of the thrust plate, connecting with the first and second holes in the axial direction of the end faces to form a complete channel. Figure 2 ); use as Figure 1 The system consists of two sets of axial bearing cores and coil windings, a winding frame, a thrust plate, and a rotor shaft. The thrust plate is machined from a magnetically conductive material (such as 45# steel) and is interference-fitted to the rotor shaft. The interference fit ensures that the rotor shaft remains interference-fitted even at the designed maximum speed. This forms an axial magnetic levitation bearing system.
[0085] This utility model features a simple, compact, and universally applicable design and assembly, making it easy to manufacture. The centrifugal force generated by the rotor shaft's rotation enables automatic heat dissipation, reducing the system's temperature rise and improving product reliability.
[0086] This utility model also provides a magnetically levitated rotating machine, which includes the aforementioned magnetically levitated bearing and a rotor shaft 7, which passes through the inner circumference of the axial bearing core 1, the inner circumference of the axial bearing core 2, and the inner circumference of the thrust disk 3.
[0087] This utility model designs a self-heating high-speed motor rotor structure (see...). Figure 1 It can solve the following problems:
[0088] 1. Solve the problem of high temperature in axial bearing systems leading to decreased suspension accuracy and risk of axial mechanical collision;
[0089] 2. Solve the problem of rising temperature in the thrust disc, axial bearing core, and rotor shaft;
[0090] 3. Solve the problem of difficult air-cooled heat dissipation and low heat dissipation efficiency of high-speed motor rotors.
[0091] 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 magnetic bearing, characterized by: include: Axial bearing core one (1), axial bearing core two (2) and thrust disk (3), in the axial direction of the magnetic levitation bearing, the thrust disk (3) is disposed between the axial bearing core one (1) and the axial bearing core two (2), and the rotor shaft (7) passes through the inner circumference of the axial bearing core one (1), the inner circumference of the axial bearing core two (2) and the inner circumference of the thrust disk (3); The axial bearing core (1) includes a radially outer portion (11), a radially inner portion (12), and an axially outer portion (14). Along the radial direction of the axial bearing core (1), the radially outer portion (11) is located radially outside the radially inner portion (12). One axial end of the radially outer portion (11) is connected to the axially outer portion (14), and the other axial end is opposite to the thrust plate (3). One axial end of the radially inner portion (12) is connected to the axially outer portion (14), and the other axial end is opposite to the thrust plate (3). A coil groove (13) is formed between the radially outer portion (11), the radially inner portion (12), and the axially outer portion (14), and a coil (5) is disposed in the coil groove (13). Furthermore, the axial outer portion (14) extends radially inward at the position where it connects with the radial inner portion (12) to form a radial extension portion (15). The minimum distance between the radial extension portion (15) and the rotor shaft (7) along the radial direction is less than the minimum distance between the radial inner portion (12) and the rotor shaft (7). The radial extension portion (15) and the rotor shaft (7) have a first gap (16). The radial extension portion (15), the radial inner portion (12), the thrust disk (3), and the rotor shaft (7) form a first cavity (17), allowing gas to enter the first cavity (17) through the first gap (16).
2. The magnetic levitation bearing according to claim 1, characterized in that: A first gap (18) is also provided between the axial bearing core (1) and the thrust disk (3). The first cavity (17) communicates with the first gap (18) so that gas can be introduced between the axial bearing core (1) and the thrust disk (3). The first gap (18) includes the gap between the radial outer portion (11) and the thrust disk (3) and the gap between the radial inner portion (12) and the thrust disk (3).
3. The magnetic levitation bearing according to claim 2, characterized in that: The thrust disk (3) includes a thrust disk end face (31) facing the axial bearing core (1). A first hole (33) is provided on the thrust disk end face (31) facing the interior of the thrust disk (3). An air guide channel (34) is provided inside the thrust disk (3). One end of the first hole (33) is on the thrust disk end face (31) to communicate with the first gap (18). The other end of the first hole (33) extends into the air guide channel (34) to communicate with the air guide channel (34). The radial outer end of the air guide channel (34) extends to the radial outer circumference of the thrust disk (3).
4. The magnetic levitation bearing according to claim 3, characterized in that: The thrust disk (3) has a shaft hole (30) through which the rotor shaft (7) passes. One end of the air guide channel (34) is spaced apart from the shaft hole (30) by a first distance, and the other end of the air guide channel (34) is located on the radial outer circumferential surface of the thrust disk (3). The minimum distance between the shaft hole (30) and the outer circumferential surface of the thrust disk (3) is a second distance. The first distance is greater than 0 and less than the second distance. The extension direction of the air guide channel (34) is along the radial direction of the thrust disk (3) or at an angle between (0, 90°) and the radial direction of the thrust disk (3).
5. The magnetic levitation bearing according to claim 3, characterized in that: There are multiple air guide channels (34), and the multiple air guide channels (34) are distributed at intervals along the circumferential direction of the thrust plate (3) inside the thrust plate (3), and each air guide channel (34) is connected to multiple first holes (33).
6. The magnetic levitation bearing according to claim 1, characterized in that: The axial bearing core 2 (2) includes a radially outer portion 2 (21), a radially inner portion 2 (22), and an axially outer portion 2 (24). Along the radial direction of the axial bearing core 2 (2), the radially outer portion 2 (21) is located radially outside the radially inner portion 2 (22). One axial end of the radially outer portion 2 (21) is connected to the axially outer portion 2 (24), and the other axial end is opposite to the thrust plate (3). One axial end of the radially inner portion 2 (22) is connected to the axially outer portion 2 (24), and the other axial end is opposite to the thrust plate (3). The radially outer portion two (21), the radially inner portion two (22), and the axially outer portion two (24) form a coil groove two (23), and a coil two (6) is disposed in the coil groove two (23). Furthermore, the axial outer portion two (24) extends radially inward at the position where it connects with the radial inner portion two (22) to form a radial extension portion two (25). The minimum distance between the radial extension portion two (25) and the rotor shaft (7) along the radial direction is less than the minimum distance between the radial inner portion two (22) and the rotor shaft (7). There is a second gap (26) between the radial extension portion two (25) and the rotor shaft (7). The radial extension portion two (25), the radial inner portion two (22), the thrust disk (3) and the rotor shaft (7) form a second cavity (27), allowing gas to enter the second cavity (27) through the second gap (26).
7. The magnetic levitation bearing according to claim 6, characterized in that: A second gap (28) is also provided between the axial bearing core 2 (2) and the thrust disk (3). The second cavity (27) communicates with the second gap (28) so that gas can be introduced between the axial bearing core 2 (2) and the thrust disk (3). The second gap (28) includes the gap between the radial outer portion 2 (21) and the thrust disk (3) and the gap between the radial inner portion 2 (22) and the thrust disk (3).
8. The magnetic levitation bearing according to claim 7, characterized in that: The thrust disk (3) includes a thrust disk end face (32) facing the axial bearing core (2). A second hole (35) is provided on the thrust disk end face (32) facing the interior of the thrust disk (3). An air guide channel (34) is provided inside the thrust disk (3). One end of the second hole (35) is on the thrust disk end face (32) to communicate with the second gap (28). The other end of the second hole (35) extends into the air guide channel (34) to communicate with the air guide channel (34). The radial outer end of the air guide channel (34) extends to the radial outer circumference of the thrust disk (3).
9. The magnetic levitation bearing according to claim 8, characterized in that: There are multiple air guide channels (34), which are distributed at intervals along the circumferential direction of the thrust plate (3) inside the thrust plate (3), and each air guide channel (34) is connected to multiple second holes (35).
10. A magnetic bearing rotary machine characterized by: The magnetic levitation bearing, including any one of claims 1-9, further includes a rotor shaft (7) that passes through the inner periphery of the first axial bearing core (1), the inner periphery of the second axial bearing core (2), and the inner periphery of the thrust disk (3).