Axial magnetic bearing heat dissipation structure and magnetic suspension motor
By setting a heat dissipation through hole on the magnetic bearing of the axial magnetic levitation motor and communicating with the adjustment gap, the problem of temperature increase caused by the accumulation of bearing heat is solved, and the effect of efficient heat dissipation and prolonging service life is achieved.
Patent Information
- Application Number
- CN202420938136.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The heat generated by axial magnetic bearings during operation leads to an increase in temperature, affecting the bearing performance and life, thereby affecting the stable operation and service life of the magnetic levitation motor.
A heat dissipation through hole is provided on the magnetic bearing, which penetrates the two axial end surfaces of the magnetic bearing, and communicates with the adjustment gap, and accelerates the heat dissipation process by using gas flow.
By increasing the contact area and flow speed between gas and magnetic bearings, efficient heat dissipation of magnetic bearings is achieved, working temperature is reduced, and the service life of the bearing is extended.
Smart Images
Figure CN222811079U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of magnetic suspension motors, and in particular relates to an axial magnetic bearing heat dissipation structure and a magnetic suspension motor. Background Art
[0002] In a magnetic levitation motor, an axial magnetic bearing is used to support and stabilize the axial movement of the motor rotor. Usually, there are two axial magnetic bearings, one on each side of the thrust plate, which is fixedly mounted outside the rotor. The axial magnetic bearing balances and supports the rotor by controlling the electromagnetic force.
[0003] However, the axial magnetic bearing will generate a certain amount of heat during operation. The accumulation of heat will cause the temperature to rise. Excessive temperature will affect the performance and life of the axial magnetic bearing, thereby affecting the stable operation and service life of the magnetic levitation motor. Utility Model Content
[0004] The purpose of this application is to provide an axial magnetic bearing heat dissipation structure and a magnetic levitation motor to solve the above-mentioned technical problems existing in the prior art.
[0005] This application is implemented as follows:
[0006] In the first aspect, an embodiment of the present application provides an axial magnetic bearing heat dissipation structure, including a thrust plate and two magnetic bearings, the two magnetic bearings are respectively located at the axial ends of the thrust plate, and an adjustment gap is provided between the axial end faces of the magnetic bearing and the axial end faces of the thrust plate; at least one magnetic bearing has a heat dissipation hole, the heat dissipation hole passes through the two axial end faces of the magnetic bearing, and the heat dissipation hole is connected to the adjustment gap.
[0007] In a second aspect, an embodiment of the present application provides a magnetic levitation motor, including the axial magnetic bearing heat dissipation structure provided by the embodiment of the first aspect.
[0008] The technical solution provided by this application can achieve the following beneficial effects:
[0009] In the present application, a heat dissipation hole is provided on the magnetic bearing, and the heat dissipation hole passes through the two axial end faces of the magnetic bearing. Gas can be filled into the heat dissipation hole to exchange heat with the magnetic bearing, thereby achieving the purpose of heat dissipation of the magnetic bearing; the heat dissipation hole is connected to the adjustment gap, and the gas can flow between the two. The thrust plate rotates with the rotor during operation. The rotating thrust plate forms a pressure difference between the adjustment gap and the heat dissipation hole, so that the gas flows from the heat dissipation hole toward the adjustment gap and flows rapidly to the external environment under the action of centrifugal force, thereby accelerating the flow speed of the gas in the heat dissipation hole and the adjustment gap, thereby improving the heat dissipation effect on the magnetic bearing and the thrust plate, reducing the working temperature of the magnetic bearing, and ensuring the normal use of the magnetic bearing. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0011] Figure 1 Schematic diagram of a heat dissipation structure at a first viewing angle provided by some embodiments of the present application Figure 1 ;
[0012] Figure 2 Schematic diagram of a heat dissipation structure at a second viewing angle provided by some embodiments of the present application Figure 1 ;
[0013] Figure 3 This application is about Figure 2 AA section view;
[0014] Figure 4 Schematic diagram of a heat dissipation structure at a second viewing angle provided by some embodiments of the present application Figure 2 ;
[0015] Figure 5 Schematic diagram of a heat dissipation structure at a first viewing angle provided by some embodiments of the present application Figure 2 ;
[0016] Figure 6 is a cross-sectional view of a heat dissipation structure provided in some embodiments of the present application Figure 1 ;
[0017] Figure 7 is a cross-sectional view of a heat dissipation structure provided in some embodiments of the present application Figure 2 ;
[0018] Figure 8 The structure of the thrust plate and the heat sink provided in some embodiments of the present application is schematically shown. Figure 1 ;
[0019] Fig. 9 The structure of the thrust plate and the heat sink provided in some embodiments of the present application is schematically shown. Figure 2 ;
[0020] Fig.10 The structure of the thrust plate and the heat sink provided in some embodiments of the present application is schematically shown. Figure 3 .
[0021] In the figure: 100-thrust plate, 200-magnetic bearing, 210-heat dissipation hole, 220-mounting cavity, 230-convection hole, 300-adjustment gap, 400-heat sink, 410-first type heat sink, 420-second type heat sink, 500-heat dissipation gap, 600-rotor. DETAILED DESCRIPTION
[0022] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.
[0023] The present application embodiment provides an axial magnetic bearing heat dissipation structure, referring to Figure 1 , Figure 3 , Figure 5 refer to Figure 7 As shown, it includes a thrust plate 100 and two magnetic bearings 200. The two magnetic bearings 200 are respectively located at the axial ends of the thrust plate 100, and there is an adjustment gap 300 between the axial end surface of the magnetic bearing 200 and the axial end surface of the thrust plate 100, referring to Figure 3 , Figure 6 and Figure 7 The thrust plate 100 is used to be fixedly sleeved outside the rotor 600, and the two magnetic bearings 200 adjust the position of the rotor 600 by controlling the position of the thrust plate 100 between the two.
[0024] At least one magnetic bearing 200 has a heat dissipation through hole 210, referring to Figures 1 to 7 As shown, the heat dissipation through hole 210 runs through the two axial end faces of the magnetic bearing 200. The heat dissipation through hole 210 is provided, and the cooling medium can be filled into the heat dissipation through hole 210 to exchange heat with the magnetic bearing 200, thereby achieving the purpose of dissipating heat from the magnetic bearing 200 and reducing the temperature of the magnetic bearing 200. The cooling medium is generally gas, and liquid can also be selected when necessary. The heat dissipation through hole 210 increases the contact area between the gas and the magnetic bearing 200, thereby improving the heat dissipation efficiency of the magnetic bearing 200.
[0025] Furthermore, the heat dissipation through hole 210 is connected to the adjustment gap 300, referring to Figure 3 , Figure 6 and Figure 7As shown. After the heat dissipation through-hole 210 passes through the two axial end faces of the magnetic bearing 200, it is connected to the adjustment gap 300 between the magnetic bearing 200 and the thrust plate 100, and the gas can flow between the heat dissipation through-hole 210 and the adjustment gap 300. During the use of the magnetic levitation motor, since the thrust plate 100 is fixed to the rotor 600, the thrust plate 100 will rotate with the rotor 600. During the rotation of the thrust plate 100, the gas will be driven to flow, thereby forming a pressure difference between the adjustment gap 300 and the heat dissipation through-hole 210, so that the gas can flow from the heat dissipation through-hole 210 toward the adjustment gap 300, and then flow to the external environment under the action of the centrifugal force generated by the rotation of the thrust plate 100.
[0026] refer to Figure 3 , Figure 6 and Figure 7 As shown, after the thrust plate 100 rotates, due to the effect of the pressure difference, the gas flows from the heat dissipation through hole 210 to the adjustment gap 300, and then moves toward the outside of the adjustment gap 300 along the radial direction of the thrust plate 100 under the effect of the centrifugal force. The flow direction of the gas can refer to the direction indicated by the dotted arrow in the figure. The rotation of the thrust plate 100 can speed up the flow of the gas, speed up the replacement frequency of the gas in the heat dissipation through hole 210 and the adjustment gap 300, and improve the heat exchange coefficient between the gas and the magnetic bearing 200 and the thrust plate 100, thereby improving the heat dissipation effect of the gas on the magnetic bearing 200 and the thrust plate 100, reducing the working temperature of the magnetic bearing 200, and ensuring that the magnetic bearing 200 can always maintain its stable performance during use.
[0027] In some embodiments of the present application, a mounting cavity 220 is provided inside the magnetic bearing 200, and the mounting cavity 220 is used to mount the coil. Figure 3 , Figure 6 and Figure 7 As shown. Part of the heat generated by the magnetic bearing 200 during operation comes from the coil. The mounting cavity 220 is generally arranged around the axis of the magnetic bearing 200. In order to enable the heat dissipation through-holes 210 to stably dissipate the heat generated during the operation of the coil, a plurality of heat dissipation through-holes 210 are arranged on the magnetic bearing 200. The more the number of heat dissipation through-holes 210, the larger the contact area between the gas and the magnetic bearing 200, and the better the heat dissipation effect.
[0028] The plurality of heat dissipation holes 210 can be divided into two groups of heat dissipation holes, each of which includes a plurality of heat dissipation holes 210 arranged around the axis of the magnetic bearing 200. Figure 1 , Figure 2 , Figure 4 and Figure 5As shown. The two groups of heat dissipation through holes are respectively located at different radial positions of the magnetic bearing 200. According to the setting position of the mounting cavity 220, in the radial direction of the magnetic bearing 200, the two groups of heat dissipation through holes are respectively distributed on both sides of the mounting cavity 220, referring to Figure 3 , Figure 6 and Figure 7 As shown, heat dissipation through holes 210 of different heat dissipation through hole groups are distributed on both the inner and outer sides of the installation cavity 220. The closer the heat dissipation through hole group is to the installation cavity 220, the easier it is for the heat generated by the coil in the installation cavity 220 to be transferred to the heat dissipation through hole 210, and heat exchange occurs with the gas in the heat dissipation through hole 210.
[0029] The heat dissipation through-hole group located on the inner side of the installation cavity 220, on the one hand, can conduct the heat generated by the coil during operation, and on the other hand, the heat dissipation through-hole group is arranged closer to the axis of the magnetic bearing 200. A through-hole for the rotor 600 to pass through is arranged in the center of the magnetic bearing 200. The rotor 600 generates heat during operation. The temperature of the magnetic bearing 200 arranged around the rotor 600 will gradually increase under the influence of the heat of the rotor 600. However, due to the provision of the heat dissipation through-hole 210, the heat of the part of the magnetic bearing 200 close to the rotor 600 can be conducted toward the heat dissipation through-hole 210, and carried away by the gas in the heat dissipation through-hole 210, thereby completing the heat dissipation of the magnetic bearing 200.
[0030] In some preferred embodiments, the plurality of heat dissipation holes 210 in each heat dissipation hole group are evenly distributed around the axis of the magnetic bearing 200. The heat dissipation effect of the gas on each part of the magnetic bearing 200 is balanced to avoid heat accumulation in a local position of the magnetic bearing 200 and excessive heat. Figure 2 As shown, in the heat dissipation through hole group located on the side of the axis of the magnetic bearing 200 of the installation cavity 220, that is, in the heat dissipation through hole group located in the inner layer of the installation cavity 220, the spacing between two adjacent heat dissipation through holes 210 is a first spacing, and the first spacing is Figure 2 In the heat dissipation through hole group located on the side of the mounting cavity 220 away from the axis of the magnetic bearing 200, that is, in the heat dissipation through hole group located in the inner layer of the mounting cavity 220, the spacing between two adjacent heat dissipation through holes 210 is the second spacing. Figure 2 The letter b is used to mark the second spacing.
[0031] Since the heat dissipation holes 210 located in the inner layer need to conduct the heat of the rotor 600 and the heat of the coil at the same time, the heat dissipation holes 210 in the inner layer need to be distributed more densely, and the first spacing is set to be smaller. In this way, heat can be prevented from accumulating in the middle of the magnetic bearing 200, so that the overall temperature of the magnetic bearing 200 is as balanced as possible. The heat dissipation holes 210 located in the outer layer need to conduct less heat, and the part of the magnetic bearing 200 corresponding to the heat dissipation holes 210 in the outer layer is closer to the external environment in the radial direction of the magnetic bearing 200. The heat on this part of the magnetic bearing 200 can be directly conducted to the external environment, and the heat dissipation requirements of the heat dissipation holes 210 are lower. Therefore, the heat dissipation holes 210 located in the outer layer can be distributed more sparsely, and the second spacing is set to be larger. Too many heat dissipation holes 210 will reduce the structural strength of the magnetic bearing 200, which has a greater impact on the structural strength of the magnetic bearing 200. Therefore, the number of heat dissipation holes 210 needs to be set appropriately, and the number of heat dissipation holes 210 should be minimized while ensuring the heat dissipation effect.
[0032] The first spacing and the second spacing may refer to the distance between the axis lines of two adjacent heat dissipation through holes 210, which may be a straight line distance or an arc line distance. When the diameters of the heat dissipation through holes 210 are the same, the first spacing and the second spacing may also refer to the distance between the edges of the holes of two adjacent heat dissipation through holes 210 that are close to each other.
[0033] In other preferred embodiments, in the heat dissipation through hole group located on the side of the mounting cavity 220 away from the axis of the magnetic bearing 200, in the radial direction of the magnetic bearing 200, along the direction from the axis of the magnetic bearing 200 to its outer peripheral surface, the width of the heat dissipation through hole 210 gradually decreases, referring to Figure 4 The width of the heat dissipation through hole 210 near the installation cavity 220 is set larger, which can increase the contact area between the gas and the heat dissipation through hole 210, thereby increasing the heat exchange coefficient between the gas and the magnetic bearing 200, and improving the heat dissipation effect of the heat dissipation through hole 210 on the part of the magnetic bearing 200 near the installation cavity 220.
[0034] In some other preferred embodiments, in the heat dissipation through hole group located on the side of the axis of the magnetic bearing 200 of the mounting cavity 220, in the radial direction of the magnetic bearing 200, along the direction from the axis of the magnetic bearing 200 to its outer peripheral surface, the width dimension of the heat dissipation through hole 210 close to the axis of the magnetic bearing 200 gradually decreases, referring to Figure 4 As shown, the width of the heat dissipation hole 210 close to the axis of the magnetic bearing 200 is larger, thereby improving the heat dissipation effect of the heat dissipation hole 210 on the heat generated during the operation of the rotor 600. And / or, the width of the portion of the heat dissipation hole 210 close to the mounting cavity 220 gradually increases, referring to Figure 4As shown, the width of the heat dissipation through hole 210 near the mounting cavity 220 is larger, thereby improving the heat dissipation effect of the heat dissipation through hole 210 on the heat generated during the operation of the coil. Exemplarily, the cross section of the heat dissipation through hole 210 can be trapezoidal or hourglass-shaped. In the case where the cross section of the heat dissipation through hole 210 is trapezoidal, the longer bottom side can be set close to the mounting cavity 220 or the axis of the magnetic bearing 200, which can be determined according to actual needs.
[0035] In addition, the heat dissipation through holes 210 may be provided on both magnetic bearings 200 , or the heat dissipation through holes 210 may be provided on only one of the magnetic bearings 200 .
[0036] The outer peripheral surface of the thrust plate 100 may be provided with a plurality of heat sinks 400, as shown in FIG. Figures 8 to 10 As shown, the heat sink 400 has two functions. On the one hand, the heat sink 400 increases the contact area between the thrust disk 100 and the gas, which can enhance the heat dissipation effect of the thrust disk 100. The heat generated by the thrust disk 100 during operation can be dissipated through the heat sink 400. On the other hand, during the rotation of the thrust disk 100, the heat sink 400 can enhance the flow of the gas around the thrust disk 100, increase the turbulence of the fluid, and improve the heat transfer coefficient, thereby enhancing the heat exchange effect between the gas and the magnetic bearing 200 and the thrust disk 100.
[0037] In the circumferential direction of the thrust disk 100, a heat dissipation gap 500 is formed between two adjacent heat dissipation fins 400, and the adjustment gap 300 is connected to the heat dissipation gap 500. In some preferred embodiments, in order to improve the matching effect between the magnetic bearing 200 and the heat dissipation gap 500 and enhance the heat dissipation effect of the magnetic bearing 200, convection holes 230 are provided on both magnetic bearings 200. Figures 5 to 7 As shown, similar to the heat dissipation through hole 210 , the convection hole 230 also penetrates the two axial end surfaces of the magnetic bearing 200 , and during the rotation of the thrust plate 100 , any convection hole 230 can be connected to the heat dissipation gap 500 .
[0038] The convection holes 230 are also connected to the adjustment gap 300 to form a channel for gas to pass through. The heat of the magnetic bearing 200 can also be transferred to the gas in the convection holes 230, and heat is exchanged through the gas. Unlike the heat dissipation through-holes 210, the gas passing through the convection channel can be connected to the heat dissipation gap 500, and the rotation of the thrust plate 100 can enhance the gas disturbance effect around the magnetic bearing 200 and the thrust plate 100, thereby further improving the heat exchange effect of the gas.
[0039] During the rotation of the thrust plate 100, the thrust plate 100 can rotate to multiple positions. In some positions, the convection holes 230 are connected to the heat dissipation gap 500. In other positions, the heat sink 400 is located on the extension path of the space inside the convection holes 230, and the convection holes 230 are not connected to the heat dissipation gap 500.
[0040] In some embodiments of the present application, the convection holes 230 of the two magnetic bearings 200 are arranged one by one, and the two convection holes 230 corresponding to each other are arranged along the axial direction of the magnetic bearing 200. Figure 6 As shown. During the rotation of the thrust plate 100, the gas in the two convection holes 230 flows toward the thrust plate 100, and the flow paths of the gas in the one-to-one convection holes 230 overlap in the heat dissipation gap 500. When the rotation speed of the thrust plate 100 is low, or the circumferential distance of the heat dissipation gap 500 is long, the gas in the two convection holes 230 collides with each other in the heat dissipation gap 500, thereby improving the gas disturbance effect around the magnetic bearing 200 and the thrust plate 100, and further improving the heat exchange effect.
[0041] In other embodiments of the present application, the convection holes 230 of the two magnetic bearings 200 are respectively connected to different areas of the heat dissipation gap 500. Figure 7 As shown, the flow paths of all the convection holes 230 of the two magnetic bearings 200 do not overlap. When the rotation speed of the thrust plate 100 is high, or the circumferential distance of the heat dissipation gap 500 is short, the gas in the convection holes 230 is dispersed over a wide range, which can increase the degree of disturbance of the gas in multiple areas around the thrust plate 100, thereby improving the heat exchange effect between the gas and the thrust plate 100, or the gas and the magnetic bearing 200.
[0042] In some optional embodiments, reference Figures 8 to 10 As shown, a plurality of heat sinks 400 are disposed on the thrust plate 100, and the plurality of heat sinks 400 are evenly distributed along the circumference of the thrust plate 100. Figure 5 As shown, there are also multiple convection holes 230, which are evenly distributed along the circumference of the magnetic bearing 200, and the number of convection holes 230 and the number of heat sinks 400 provided on any magnetic bearing 200 are equal. Since the heat sinks 400 are evenly distributed along the circumference of the thrust plate 100, the heat dissipation gaps 500 formed between adjacent heat sinks 400 are also evenly distributed along the circumference of the thrust plate 100, and are provided one-to-one with the convection holes 230 on any magnetic bearing 200. The convection holes 230 correspond one-to-one with the heat dissipation gaps 500, so that the disturbance of the gas is more uniform, and the heat exchange effect on the magnetic bearing 200 and the thrust plate 100 is also more uniform.
[0043] refer to Fig. 9As shown, in some other optional embodiments, the heat sink 400 is divided into a first type of heat sink 410 and a second type of heat sink 420. The first type of heat sink 410 and the second type of heat sink 420 are spaced apart along the circumference of the thrust plate 100, and the height of the first type of heat sink 410 is greater than the height of the second type of heat sink 420. The different heights of the two types of heat sinks 400 can improve the disturbance effect of the heat sink 400 on the gas, thereby enhancing the heat exchange effect.
[0044] refer to Fig.10 As shown, in other optional embodiments, the extension path of the heat sink 400 is inclined relative to the axis of the thrust disk 100. The extension path refers to the extension path of the portion where the heat sink 400 is connected to the thrust disk 100. Compared with the heat sink 400 extending along the axial direction of the thrust disk 100, the heat sink 400 arranged obliquely has a better disturbance effect on the gas. Further preferably, the middle part of the heat sink 400 can be recessed. Different from the gas flow direction in the above-mentioned embodiment, the recessed heat sink 400 can make the gas flow toward the magnetic bearing 200 on one side during the rotation of the thrust disk 100. The magnetic bearing 200 and the thrust disk 100 are generally concentrated at one end position of the rotor 600, and the magnetic bearing 200 to which the gas flows is concentrated is located on the outside. In this way, the magnetic bearing 200, the thrust disk 100 and the rotor 600 can be fully heat exchanged.
[0045] An embodiment of the present application further provides a magnetic levitation motor, comprising the heat dissipation structure of the axial magnetic bearing 200 provided in any of the above embodiments.
[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An axial magnetic bearing heat dissipation structure, characterized in that: Comprising a thrust disk (100) and two magnetic bearings (200), the two magnetic bearings (200) being respectively located at two axial ends of the thrust disk (100), and an adjustable gap (300) is provided between the axial end surface of the magnetic bearing (200) and the axial end surface of the thrust disk (100); At least one of the magnetic bearings (200) has a heat dissipation through hole (210), the heat dissipation through hole (210) runs through two axial end surfaces of the magnetic bearing (200), and the heat dissipation through hole (210) is in communication with the adjustment gap (300).
2. The axial magnetic bearing heat dissipation structure according to claim 1, characterized in that: There are a plurality of the heat dissipation through holes (210), and the plurality of the heat dissipation through holes (210) are divided into two groups of heat dissipation through hole groups, and each group of the heat dissipation through hole groups comprises a plurality of the heat dissipation through holes (210) arranged around the axis of the magnetic bearing (200); An installation cavity (220) is provided inside the magnetic bearing (200), the installation cavity (220) being used to install a coil, and in the radial direction of the magnetic bearing (200), two groups of heat dissipation through-hole groups are distributed on both sides of the installation cavity (220).
3. The axial magnetic bearing heat dissipation structure according to claim 2, characterized in that: In each group of the heat dissipation through holes, a plurality of the heat dissipation through holes (210) are evenly distributed around the axis of the magnetic bearing (200); In the heat dissipation through hole group located on the side of the mounting cavity (220) close to the axis of the magnetic bearing (200), the spacing between two adjacent heat dissipation through holes (210) is a first spacing, and in the heat dissipation through hole group located on the side of the mounting cavity (220) away from the axis of the magnetic bearing (200), the spacing between two adjacent heat dissipation through holes (210) is a second spacing, and the second spacing is greater than the first spacing.
4. The axial magnetic bearing heat dissipation structure according to claim 2, characterized in that: In the heat dissipation through hole group located on the side of the mounting cavity (220) close to the axis of the magnetic bearing (200), in the radial direction from the axis of the magnetic bearing (200) toward the outer peripheral surface thereof, the width dimension of the portion of the heat dissipation through hole (210) close to the axis of the magnetic bearing (200) gradually decreases, and / or the width dimension of the portion of the heat dissipation through hole (210) close to the mounting cavity (220) gradually increases; And / or, in the heat dissipation through hole group located on the side of the installation cavity (220) away from the axis of the magnetic bearing (200), the width dimension of the heat dissipation through hole (210) gradually decreases from the axis of the magnetic bearing (200) toward its outer peripheral surface in the radial direction.
5. The axial magnetic bearing heat dissipation structure according to claim 1, characterized in that: The outer peripheral surface of the thrust plate (100) is provided with a plurality of heat sinks (400).
6. The axial magnetic bearing heat dissipation structure according to claim 5, characterized in that: The two magnetic bearings (200) are each provided with a convection flow hole (230), wherein the convection flow hole (230) penetrates two axial end surfaces of the magnetic bearing (200); In the circumferential direction of the thrust disk (100), a heat dissipation gap (500) is formed between two adjacent heat dissipation fins (400), and during the rotation of the thrust disk (100), the convection holes (230) can be correspondingly connected to the heat dissipation gap (500).
7. The axial magnetic bearing heat dissipation structure according to claim 6, characterized in that: The convection holes (230) of the two magnetic bearings (200) are arranged in a one-to-one correspondence, and the two convection holes (230) corresponding to each other are arranged along the axial direction of the magnetic bearing (200); Alternatively, the convection holes (230) of the two magnetic bearings (200) are respectively connected to different areas of the heat dissipation gap (500).
8. The axial magnetic bearing heat dissipation structure according to claim 6, characterized in that: The plurality of heat sinks (400) are evenly distributed along the circumference of the thrust plate (100), there are a plurality of convection holes (230), the plurality of convection holes (230) are evenly distributed along the circumference of the magnetic bearing (200), and the number of the convection holes (230) of any magnetic bearing (200) is equal to the number of the heat sinks (400).
9. The axial magnetic bearing heat dissipation structure according to claim 5, characterized in that: The heat sink (400) is divided into a first type of heat sink (410) and a second type of heat sink (420), the first type of heat sink (410) and the second type of heat sink (420) are spaced apart along the circumference of the thrust plate (100), and the height of the first type of heat sink (410) is greater than the height of the second type of heat sink (420); And / or, the extension path of the heat sink (400) is arranged to be inclined relative to the axis of the thrust plate (100).
10. A magnetic levitation motor, characterized in that: It comprises the axial magnetic bearing heat dissipation structure as described in any one of claims 1 to 9.