CN216519206U - Magnetic bearing and rotating mechanism using same - Google Patents
Magnetic bearing and rotating mechanism using same Download PDFInfo
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- CN216519206U CN216519206U CN202020572479.7U CN202020572479U CN216519206U CN 216519206 U CN216519206 U CN 216519206U CN 202020572479 U CN202020572479 U CN 202020572479U CN 216519206 U CN216519206 U CN 216519206U
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Abstract
The application discloses a magnetic bearing and a rotating mechanism using the same, wherein the magnetic bearing comprises a magnetic rotor component and a magnetic stator component matched with the magnetic rotor component; the magnetic rotor assembly comprises a rotor shaft and a thrust disc sleeved on the rotor shaft; the magnetic stator component comprises a bearing stator, a permanent magnetic ring, a magnetic conduction ring and a coil winding; the bearing stator comprises a first central channel, a coil ring groove and an open groove, wherein the coil ring groove is arranged along the circumferential direction, the open groove is used for connecting the first central channel with the coil ring groove, a thrust disc is positioned in the first central channel and is partially embedded into the open groove, a magnetic conduction ring comprises an outer magnetic ring and an inner magnetic ring which are mutually connected, and the outer magnetic ring is sleeved on the inner magnetic ring; the outer magnetic ring, the permanent magnetic ring and the bearing stator are sequentially arranged along the axial direction of the bearing stator, the permanent magnetic ring comprises a second central channel, and at least part of the inner magnetic ring is positioned in the second central channel and the first central channel. Through the mode, the axial length of the rotor shaft can be reduced, and the critical speed of the rotor shaft is further improved.
Description
Technical Field
The present disclosure relates to magnetic bearings, and more particularly, to a magnetic bearing and a rotating mechanism using the same.
Background
The magnetic suspension bearing is a high-performance bearing which stably suspends a rotor by utilizing accurately controlled electromagnetic force so that a stator and the rotor are not in mechanical contact. Meanwhile, the electromagnetic force can be accurately adjusted through a special control system, so that the rigidity and the damping can be adjusted. The vacuum pump also has the advantages of low energy consumption, long service life, no lubrication, no pollution and the like, and is particularly suitable for special application occasions such as high speed, vacuum, ultra-clean and the like.
In the prior art, two magnetic conductors are axially arranged along a bearing, a permanent magnet is arranged between the two magnetic conductors, a coil winding is arranged in the magnetic conductors, and the permanent magnet and the coil winding are matched to provide an axial magnetic flux loop so as to control an internal rotor.
SUMMERY OF THE UTILITY MODEL
The application mainly provides a magnetic bearing and a rotating mechanism using the same. The problem that the critical speed of the rotor is low due to the fact that the axial length is large in the prior art is solved.
In order to solve the technical problem, the application adopts a technical scheme that: providing a magnetic bearing comprising a magnetic rotor assembly and a magnetic stator assembly cooperating with the magnetic rotor assembly; the magnetic rotor assembly comprises a rotor shaft and a thrust disc sleeved on the rotor shaft; the magnetic stator component comprises a bearing stator, a permanent magnet ring, a magnetic conduction ring and a coil winding; the bearing stator comprises a first central channel, a coil ring groove and an open groove, wherein the coil ring groove is arranged along the circumferential direction, the open groove is used for connecting the first central channel with the coil ring groove, the thrust disc is positioned in the first central channel and is partially embedded into the open groove, and the coil winding is arranged in the coil ring groove; the magnetic conduction ring comprises an outer magnetic ring and an inner magnetic ring which are connected with each other, and the outer magnetic ring is sleeved on the inner magnetic ring; the outer magnetic ring, the permanent magnetic ring and the bearing stator are sequentially arranged along the axial direction of the bearing stator, the permanent magnetic ring comprises a second central channel, and at least part of the inner magnetic ring is positioned in the second central channel and the first central channel; the permanent magnet magnetic flux loop starts from the permanent magnet ring and sequentially passes through the outer magnet ring, the inner magnet ring, the thrust disc and the bearing stator to return to the permanent magnet ring, or the permanent magnet magnetic flux loop starts from the permanent magnet ring and sequentially passes through the bearing stator, the thrust disc, the inner magnet ring and the outer magnet ring to return to the permanent magnet ring; the coil winding is used for generating an electromagnetic magnetic flux loop after current is applied, and the electromagnetic magnetic flux loop is arranged on the bearing stator and is transmitted around the coil ring groove; the permanent magnetic flux loop and the electromagnetic magnetic flux loop are matched on two sides of the thrust disc along the axis direction to form magnetic flux density deviation, and then the rotor shaft is controlled.
According to an embodiment provided by the application, the axes of the bearing stator, the permanent magnet ring, the coil winding, the outer magnet ring, the inner magnet ring, the rotor shaft and the thrust disc are all located on the same straight line.
According to an embodiment provided herein, the coil winding has a slot fill factor in the coil ring slot of greater than or equal to 50% and less than or equal to 70%.
According to an embodiment provided by the present application, the coil winding has a slot fill factor of 60% within the coil ring slot.
According to an embodiment provided by the present application, an air gap between the thrust disc located in the open slot and the slot sidewall of the open slot is 0.5 mm.
According to an embodiment provided by the present application, a gap between the inner magnetic ring and the thrust disk is greater than or equal to 0.4mm and less than or equal to 0.6 mm.
According to an embodiment provided by the present application, a radial ring width of the bearing stator is greater than a radial ring width of the permanent magnet ring, and the radial ring width of the bearing stator is smaller than the radial ring width of the outer magnet ring.
According to an embodiment that this application provided, permanent magnetism ring, bearing stator and magnetic conduction ring are along the outer surface parallel and level of axis.
According to an embodiment provided herein, the rotor shaft is a magnetic conductor or a magnetic insulator.
To solve the above technical problem, another technical solution adopted by the present application is: there is provided a rotary mechanism comprising a magnetic bearing as described in any of the above.
The beneficial effect of this application is: different from the situation in the prior art, in the magnetic bearing provided by the application, because the magnetic flux loops of the permanent magnet ring and the coil winding are all in the radial direction, the rotor shaft does not need to participate in the magnetic flux loops of the permanent magnet ring and the coil winding as a magnetizer, the axial length of the rotor shaft can be effectively reduced, and further the critical speed of the rotor shaft can be improved, and further the magnetic conductive ring is positioned on the magnetic flux loop generated by the permanent magnet ring, so that the magnetic conductive ring can provide basic axial magnetic force as axial gravity unloading and gravity offset, the requirement on axial control force is reduced, and the difficulty in axial control is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural view of a first embodiment of a magnetic bearing provided herein;
FIG. 2 is a schematic view of the permanent magnet flux circuit provided by the permanent magnet ring in the magnetic bearing shown in FIG. 1;
FIG. 3 is a schematic illustration of an electromagnetic flux circuit for a first direction of current provided by the coil windings in the magnetic bearing shown in FIG. 1;
FIG. 4 is a schematic illustration of an electromagnetic flux circuit for a second direction of current provided by the coil windings in the magnetic bearing shown in FIG. 1;
FIG. 5 is a magnetic flux circuit in which permanent magnet flux provided by the permanent magnet ring mixes with first direction current flux provided by the coil winding in the magnetic bearing of FIG. 1;
fig. 6 is a magnetic flux circuit in which permanent magnetic flux provided by the permanent magnet ring and second direction current flux provided by the coil winding are mixed in the magnetic bearing of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used for explaining the relative position relationship between the components, the motion situation, and the like under a certain posture (as shown in the drawing), and if the certain posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Referring to fig. 1-6, the present application provides a magnetic bearing 10, wherein the magnetic bearing 10 includes a magnetic rotor assembly 100 and a magnetic stator assembly 200 cooperating with the magnetic rotor assembly 100.
As shown in fig. 1, the magnetic rotor assembly 100 includes a rotor shaft 110 and a thrust disc 120 sleeved on the rotor shaft. Thrust disc 120 may be an annular ring having an axial thickness and disposed coaxially with rotor shaft 110. In particular, the thrust disk 120 may be a magnetic conductor.
As shown in fig. 1, magnetic stator assembly 200 includes a bearing stator 210, a permanent magnet ring 220, a flux ring 230, and a coil winding 240.
The bearing stator 210 includes a first central passage 211, a coil ring groove 212 disposed along a circumferential direction, and an opening groove 213 connecting the first central passage 211 and the coil ring groove 212. Specifically, the bearing stator 210 may also be a circular ring having a certain axial thickness, the inside of the entire bearing stator 210 encloses to form a first central channel 211, further, the bearing stator 210 is provided with a coil ring groove 212 along the circumferential direction of the bearing stator 210, and the coil ring groove 212 may specifically be a square ring groove, which is not limited herein. Further, an open groove 213 is formed between the coil ring groove 212 and the first central passage 211, and the length of the open groove 213 along the axial direction is smaller than the length of the coil ring groove 212 along the axial direction. Alternatively, the open groove 213 is located in the middle region of the coil ring groove 212 in the axial direction. In the exemplary embodiment, bearing stator 210 is also a magnetic conductor in nature.
As shown in fig. 1, the thrust disk 120 is located in the first central passage 211 and is partially embedded in the open groove 213. That is, the main body portion of the thrust disk 120 is located in the first central passage 211 of the bearing stator 210, and the portion of the thrust disk 120 is inserted into the open groove 213.
The coil winding 240 is disposed in the coil ring groove 212. Specifically, the coil winding 240 is also of an annular structure and is disposed within the coil ring groove 212 such that the coil winding 240 is disposed entirely around the thrust disc 120.
The magnetic conductive ring 230 includes an outer magnetic ring 231 and an inner magnetic ring 232 connected to each other, the outer magnetic ring 231 is sleeved on the inner magnetic ring 232, optionally, the outer magnetic ring 231 and the inner magnetic ring 232 are integrally formed, and the outer magnetic ring 231 may be specifically sleeved on an end portion of the inner magnetic ring 232 along an axial direction.
As shown in fig. 1, the outer magnetic ring 231, the permanent magnetic ring 220 and the bearing stator 210 are sequentially arranged along the axial direction of the bearing stator 210, the permanent magnetic ring 220 includes a second central channel 221, and at least a portion of the inner magnetic ring 232 is located in the second central channel 221 and the first central channel 211, and is arranged at an interval from the permanent magnetic ring 220, the bearing stator 210 and the thrust plate 120.
Specifically, the inner magnet ring 232 is at least partially embedded in the second central channel 221 and the first central channel 211 and is spaced apart from the permanent magnet ring 220, the bearing stator 210, and the thrust disk 120.
In a specific embodiment, both ends of the permanent magnet ring 220 in the axial direction respectively abut against the bearing stator 210 and the outer magnet ring 231 to reduce the width of the gap at the connection between the permanent magnet ring and the outer magnet ring, so as to prevent the magnetic flux density of the magnetic flux loop generated by the permanent magnet ring 220 from being attenuated when passing through the gap.
In a specific embodiment, the magnetic conductive ring 230 may be a magnetic conductor.
In a specific embodiment, the permanent magnet ring 220 is used to generate a permanent magnet flux circuit, where the permanent magnet flux circuit starts from the permanent magnet ring 220 and sequentially passes through the outer magnet ring 231, the inner magnet ring 232, the thrust disk 120, and the bearing stator 210 and returns to the permanent magnet ring 220, or the permanent magnet flux circuit starts from the permanent magnet ring 220 and sequentially passes through the bearing stator 210, the thrust disk 120, the inner magnet ring 232, and the outer magnet ring 231 and returns to the permanent magnet ring 220. Specifically, the N pole and the S pole of the permanent magnet ring 220 are arranged in a direction, and the specific direction of the permanent magnet flux circuit is not limited herein.
The coil windings 240 are used to create an electromagnetic flux circuit upon application of an electrical current, which is carried on the bearing stator 210 and around the coil ring slots 212. The direction of the electromagnetic flux loop is specifically related to the direction of the current, and is not limited herein.
The permanent magnetic flux circuit and the electromagnetic magnetic flux circuit are matched on two sides of the thrust disc 120 along the axial direction to form magnetic flux density deviation, and then the rotor shaft 110 is controlled. Specifically, the magnetic flux density of the permanent magnetic flux circuit and the magnetic flux density of the electromagnetic flux circuit are superimposed or weakened on one side of the thrust disk 120 in the axial direction and weakened or superimposed on the other side of the thrust disk 120 in the axial direction, so that a magnetic flux density deviation is formed on both sides of the thrust disk 120 in the axial direction, thereby controlling the rotor shaft 110.
As shown in fig. 2, fig. 2 is a schematic diagram of a permanent magnetic flux loop provided by a permanent magnetic ring 220, and the permanent magnetic ring 220 is magnetized along a radial direction to form a permanent magnetic flux loop. Specifically, the magnetic lines of force of the permanent magnetic flux loop start from the N-level of the permanent magnetic ring 220, then sequentially pass through the outer magnetic ring 231 and the inner magnetic ring 232 of the magnetic conductive ring 230 and enter the thrust disk 120, then enter the bearing stator 210 and are shunted to form two magnetic lines of force, then merge at the connecting position of the permanent magnetic ring 220 and the bearing stator 210 to form one magnetic line of force, and return to the S-level of the permanent magnetic ring 220.
In particular embodiments, since the magnetic flux circuit generated by permanent magnet ring 220 is a radial magnetic circuit, rotor shaft 110 may be a magnetic conductor or a magnetic insulator. Alternatively, since the flux circuit generated by permanent magnet ring 220 need not pass through rotor shaft 110, rotor shaft 110 may be a magnetic insulator, thereby reducing costs. And because the magnetic flux return circuit that permanent magnet ring 220 produced is radial magnetic circuit, need not to carry out transmission through rotor shaft 110, can effectively reduce the axial length of rotor shaft 110.
Specifically, the rotor shaft 110 may be made of a non-magnetic material. Such as non-metallic materials, or specifically metals and alloys other than fe-co-ni and its alloys, such as cu and the like and its alloys. As a result, more selectivity in the material of the entire rotor shaft 110 may be provided, which may in turn provide strength or other properties of the rotor shaft 110.
As shown in fig. 3 and 4, fig. 3 and 4 are schematic diagrams of an electromagnetic flux circuit provided by the coil winding 240, and the coil winding 240 is magnetized along a radial direction after a current is applied to form the electromagnetic flux circuit. Specifically, different electromagnetic flux loops are formed by applying a current in a first direction and a current in a second direction opposite to the first direction to coil winding 240. As shown in fig. 3, when a current in a first direction is applied to the coil winding 240, the coil winding 240 is magnetized in a radial direction to form an electromagnetic flux loop of the current in the first direction, and the permanent magnet ring 220 insulates a magnetic force generated by the coil winding 240, so that the magnetic flux generated by the coil winding 240 is transmitted only on the bearing stator 210, specifically, the electromagnetic flux loop of the current in the first direction, specifically, a counterclockwise loop is formed on the bearing stator 210 along a cross-sectional direction in an axial direction. Accordingly, as shown in fig. 4, when a current in the second direction is applied to the coil winding 240, the coil winding 240 is magnetized in the radial direction to form an electromagnetic flux loop for the current in the second direction, and an electromagnetic flux loop for the current in the second direction, specifically a clockwise loop, is formed on the bearing stator 210 in the cross-sectional direction in the axial direction.
In a specific scenario, when the permanent magnetic flux loop generated by the permanent magnetic ring 220 and the electromagnetic flux loop generated by the coil winding 240 under the current in the first direction act together, the magnetic flux density of the thrust disc 120 on the side close to the magnetic conductive ring 230 is weakened, and the magnetic flux density of the thrust disc 120 on the side away from the magnetic conductive ring 230 is overlapped, so that the magnetic flux density of the thrust disc 120 on the side away from the permanent magnetic ring 220 is greater than the magnetic flux density on the side close to the permanent magnetic ring 220, and then the control force on the thrust disc 120 is directed toward the side of the thrust disc 120 away from the permanent magnetic ring 220.
In another specific scenario, when the permanent magnetic flux loop generated by the permanent magnetic ring 220 and the electromagnetic flux loop generated by the coil winding 240 under the current in the second direction act together, the magnetic flux density of the thrust disc 120 on the side close to the magnetic conductive ring 230 is overlapped, and the magnetic flux density of the thrust disc 120 on the side away from the magnetic conductive ring 230 is weakened, so that the magnetic flux density of the thrust disc 120 on the side away from the permanent magnetic ring 220 is smaller than the magnetic flux density on the side close to the permanent magnetic ring 220, and the control force on the thrust disc 120 is directed toward the side close to the permanent magnetic ring 220.
In a specific scenario, when the magnetic flux density of the permanent magnetic flux loop generated by the permanent magnetic ring 220 and the magnetic flux density of the electromagnetic flux loop generated by the coil winding 240 are the same, fig. 5 is a schematic diagram of a mixed magnetic flux loop of the permanent magnetic flux provided by the permanent magnetic ring 220 and the first-direction current magnetic flux provided by the coil winding 240 under the first-direction current. Fig. 6 is a schematic diagram of a mixed magnetic flux loop of the permanent magnetic flux provided by the permanent magnetic ring 220 and the second-direction current magnetic flux provided by the coil winding 240 under the second-direction current.
Specifically, by controlling the flux density deviation of the thrust disc 120 between the flux density on the side away from the permanent magnet ring 220 and the flux density on the side close to the permanent magnet ring 220, levitation control of the magnet rotor assembly 100 can be achieved.
In a specific embodiment, the magnetic flux density of the permanent magnetic flux loop generated by the permanent magnetic ring 220 and the magnetic flux density of the electromagnetic flux loop generated by the coil winding 240 may be in the same range, and specifically may be 0.6T to 0.8T.
In the above embodiment, since the magnetic flux loops of the permanent magnet ring 220 and the coil winding 240 are all in the radial direction, the rotor shaft 110 does not need to be used as a magnetizer to participate in the magnetic flux loops of the permanent magnet ring 220 and the coil winding 240, the axial length of the rotor shaft 110 can be effectively reduced, and the critical speed of the rotor can be further improved, and since the magnetic flux loops are all transmitted along the radial direction, the rotor shaft 110 can be a magnetic insulator, and the cost is further reduced. Furthermore, the magnetic conductive ring 230 is located on the permanent magnetic flux loop generated by the permanent magnetic ring 220, so that the magnetic conductive ring 230 can provide a certain basic axial magnetic force, and further can be used for axial gravity unloading and gravity offset, thereby reducing the requirement on axial control force and reducing the difficulty of axial control.
In a particular embodiment, the slot fill ratio of the coil winding 240 within the coil loop slot 212 is greater than or equal to 50%, and less than or equal to 70%. Optionally, the coil winding 240 has a 60% slot fill within the coil loop slot 212.
In a specific embodiment, the air gap between the coil winding 240 and the inner wall of the coil ring groove 212 is 2-4mm, and may be 3 mm.
In a specific embodiment, the air gap between the thrust disc 120 located in the open slot 213 and the slot sidewall of the open slot 213 is 0.5 mm. Specifically, the air gaps at both ends of the open slot 213 are 0.5 mm.
In a specific embodiment of the present application, the clearance between the inner magnetic ring 232 and the thrust disk 120 is greater than or equal to 0.4mm and less than or equal to 0.6 mm. Specifically, it may be 0.4mm, 0.5mm or 0.6mm, and is not particularly limited herein.
The air gap between the thrust disc 120 in the open slot 213 and the slot side wall of the open slot 213 is 0.5mm, and the gap between the inner magnetic ring 232 and the thrust disc 120 is greater than or equal to 0.4mm and less than or equal to 0.6 mm. On the one hand, a margin is provided to allow the thrust disk 120 to be moved in the axial direction, and on the other hand, a small gap is ensured, so that the magnetic flux does not undergo a large attenuation when passing through the gap.
In the exemplary embodiment, the axes of bearing stator 210, permanent magnet ring 220, coil winding 240, outer magnet ring 231, inner magnet ring 232, rotor shaft 110, and thrust disc 120 are all collinear. That is, the bearing stator 210, the permanent magnet ring 220, the coil winding 240, the outer magnet ring 231, the inner magnet ring 232, the rotor shaft 110, and the thrust disk 120 are coaxially disposed.
In a specific embodiment, the radial ring width of the bearing stator 210 is greater than the radial ring width of the permanent magnet ring 220, and the radial ring width of the bearing stator 210 is less than the radial ring width of the outer magnet ring 231. Taking bearing stator 210 as an example, the radial ring width is the radius of the entire bearing stator 210 minus the radius of the first central passage 211. The radial ring width of the permanent magnet ring 220 is similar to the radial ring width of the outer magnet ring 231.
As shown in fig. 1, the permanent magnet ring 220, the bearing stator 210, and the magnetic conductive ring 230 are flush with each other along the outer surface of the axis. Namely, the permanent magnet ring 220, the bearing stator 210 and the magnetic conductive ring 230 are flush with the outer surface parallel to the axis.
It should be noted that the magnetic flux circuits shown in fig. 2 to 6 are only schematic, and in a specific scenario, the specific permanent magnetic flux circuit direction of the permanent magnet ring 220 is related to the position of the N pole and the S pole of the permanent magnet ring 220, and the specific electromagnetic flux circuit direction of the corresponding coil winding 240 is also related to the current direction, so that fig. 2 to 6 are not a limitation of the present application, but are only schematic.
The present application also provides a rotary mechanism comprising a magnetic bearing 10 as described in any of the embodiments above.
In summary, the present application provides a magnetic bearing and a rotating mechanism using the same, because the permanent magnetic flux loop of the permanent magnetic ring 220 and the electromagnetic magnetic flux loop of the coil winding 240 provided by the present application are both in the radial direction, the rotor shaft 110 does not need to be used as a magnetizer to participate in the magnetic flux loop of the permanent magnetic ring 220 and the coil winding 240, the axial length of the rotor shaft 110 can be effectively reduced, and further the critical speed of the rotor can be improved, and because the magnetic flux loops are all transmitted along the radial direction, the rotor shaft 110 can be a magnetic insulator, and further the cost is reduced. Furthermore, the magnetic conductive ring 230 is located on the permanent magnetic flux loop generated by the permanent magnetic ring 220, so that the magnetic conductive ring 230 can provide a certain basic axial magnetic force, and further can be used for axial gravity unloading and gravity offset, thereby reducing the requirement on axial control force and reducing the difficulty of axial control.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (10)
1. A magnetic bearing, comprising a magnetic rotor assembly and a magnetic stator assembly cooperating with the magnetic rotor assembly;
the magnetic rotor assembly comprises a rotor shaft and a thrust disc sleeved on the rotor shaft;
the magnetic stator component comprises a bearing stator, a permanent magnet ring, a magnetic conduction ring and a coil winding;
the bearing stator comprises a first central channel, a coil ring groove and an open groove, wherein the coil ring groove is arranged along the circumferential direction, the open groove is used for connecting the first central channel with the coil ring groove, the thrust disc is positioned in the first central channel and is partially embedded into the open groove, and the coil winding is arranged in the coil ring groove;
the magnetic conduction ring comprises an outer magnetic ring and an inner magnetic ring which are connected with each other, and the outer magnetic ring is sleeved on the inner magnetic ring;
the outer magnetic ring, the permanent magnetic ring and the bearing stator are sequentially arranged along the axial direction of the bearing stator, the permanent magnetic ring comprises a second central channel, and at least part of the inner magnetic ring is positioned in the second central channel and the first central channel;
the permanent magnet ring is used for generating a permanent magnet flux loop, the permanent magnet flux loop starts from the permanent magnet ring and sequentially passes through the outer magnet ring, the inner magnet ring, the thrust disc and the bearing stator to return to the permanent magnet ring, or the permanent magnet flux loop starts from the permanent magnet ring and sequentially passes through the bearing stator, the thrust disc, the inner magnet ring and the outer magnet ring to return to the permanent magnet ring;
the coil winding is used for generating an electromagnetic magnetic flux loop after current is applied, and the electromagnetic magnetic flux loop is arranged on the bearing stator and is transmitted around the coil ring groove;
the permanent magnetic flux loop and the electromagnetic magnetic flux loop are matched on two sides of the thrust disc along the axis direction to form magnetic flux density deviation, and then the rotor shaft is controlled.
2. The magnetic bearing of claim 1 wherein the axes of the bearing stator, permanent magnet ring, coil winding, outer magnet ring, inner magnet ring, rotor shaft, and thrust disc all lie in the same line.
3. The magnetic bearing of claim 1 wherein the coil windings have a slot fill ratio within the coil ring slots of greater than or equal to 50% and less than or equal to 70%.
4. The magnetic bearing of claim 3 wherein the coil windings have a 60% slot fill within the coil ring slots.
5. The magnetic bearing of claim 1 wherein the air gap between the thrust disk located within the open slot and the slot sidewall of the open slot is 0.5 mm.
6. The magnetic bearing of claim 1 wherein the gap between the inner magnetic ring and the thrust disk is greater than or equal to 0.4mm and less than or equal to 0.6 mm.
7. The magnetic bearing of claim 1 wherein the radial ring width of the bearing stator is greater than the radial ring width of the permanent magnet ring, the radial ring width of the bearing stator being less than the radial ring width of the outer magnet ring.
8. The magnetic bearing of claim 1 wherein the permanent magnet ring, the bearing stator, and the magnetically permeable ring are flush with the outer surface along the axis.
9. The magnetic bearing of claim 1 wherein the rotor shaft is a magnetic conductor or a magnetic insulator.
10. A rotary mechanism characterized in that it comprises a magnetic bearing according to any one of claims 1 to 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019224422624 | 2019-12-28 | ||
| CN201922442262 | 2019-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216519206U true CN216519206U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020572479.7U Active CN216519206U (en) | 2019-12-28 | 2020-04-16 | Magnetic bearing and rotating mechanism using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216519206U (en) |
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2020
- 2020-04-16 CN CN202020572479.7U patent/CN216519206U/en active Active
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