CN112671159A - Motor rotor, magnetic suspension device, magnetic suspension motor and turbine motor system - Google Patents
Motor rotor, magnetic suspension device, magnetic suspension motor and turbine motor system Download PDFInfo
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- CN112671159A CN112671159A CN202011535914.XA CN202011535914A CN112671159A CN 112671159 A CN112671159 A CN 112671159A CN 202011535914 A CN202011535914 A CN 202011535914A CN 112671159 A CN112671159 A CN 112671159A
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Abstract
A motor rotor, a magnetic suspension device, a magnetic suspension motor and a turbine motor system. The magnetic levitation apparatus includes: the magnetic bearing comprises a shell (1), a rotor (2), radial magnetic bearings (31, 32), axial magnetic bearings (41, 42) and a motor stator (5), wherein the two sides of the rotor (2) are provided with stepped structures, and the stepped structures on the two sides are asymmetrical. The rotor can be applied to a magnetic suspension device, and the magnetic suspension device can be applied to a magnetic suspension motor, a compressor and a pump. By the design of the invention, the stable work of the magnetic suspension motor at high rotating speed is realized, the volume and the quality of the magnetic suspension motor are reduced, and the production and manufacturing cost is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of magnetic suspension, in particular to a magnetic suspension rotor, a magnetic suspension device, a magnetic suspension motor and a turbine motor system.
Background
The traditional motor uses a contact bearing, the rotating speed of the contact bearing is mainly limited by temperature rise caused by friction heating in the bearing, and when the rotating speed exceeds a certain limit, the bearing cannot rotate continuously due to burn and the like. Limited to this, the rotation speed of the conventional motor is difficult to be further increased. The demand of the industry for high-speed motors is pressing day by day, and the research of non-contact bearings is focused on, such as the magnetic suspension motor technology. The magnetic levitation motor can be applied to a turbine motor system (such as a compressor, an expander, a pump for conveying fluid, etc.).
The magnetic suspension motor makes the rotor rotate in a suspension way by utilizing magnetic force, and the rotor and the bearing are free from contact and friction. The rotational speed of the bearing is limited only by the material of the rotor. Therefore, only a reasonable design of the rotor material enables the magnetic levitation motor to operate at high rotational speeds.
The rotor generates a large centrifugal force when rotating at a high speed. Since the centrifugal force is proportional to the radius of the rotor, in order to reduce the centrifugal force, the outer diameter of the rotor should be as small as possible, but on the other hand, the rotor needs to provide a sufficient magnetic force area, so the rotor cannot be too small, which raises the difficulty of the overall design of the magnetic suspension rotor suspension device.
The axial magnetic bearing and the thrust disc are arranged at one end of the rotor in the existing designed structure, the thrust disc protrudes in the radial direction of the rotor, and the maximum centrifugal force is at the maximum diameter of the thrust disc when the rotor rotates to work. In order to reduce the maximum outer diameter of the rotor, another structure of the existing design is to design a symmetrical stepped design at both ends of the rotor, and to install axial magnetic bearings at both sides of the symmetrical stepped design of the rotor.
The symmetrical step-shaped design of the existing rotor does not consider the characteristic of unbalanced axial force when the magnetic suspension motor actually works. The magnetic force area of the symmetrical step-shaped design is designed based on the parameter of the end with larger axial stress. And the axial force on the other end is small, so that less than all magnetic force is utilized. If the symmetrical ladder of the rotor is designed on the side with smaller axial force, a small thrust disc needs to be installed on the side with larger stress to balance the axial force, so that the structure of the product inside the magnetic suspension motor is complex, and the assembly is increased to be not beneficial to assembly and installation.
Therefore, the design wastes redundant materials, so that the manufacturing cost is high, the overall radial diameter of the rotor is large, the overall volume of the magnetic suspension motor is large, and the magnetic suspension motor is not beneficial to miniaturization and light weight. Moreover, the increase of the area of the magnetic force in the radial direction leads to the increase of the thickness of the electromagnet in the axial direction, so that the axial length of the rotor is directly lengthened, the critical rotating speed is reduced, and the improvement of the rotating speed of the rotor is not facilitated.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a motor rotor, a magnetic levitation apparatus, a magnetic levitation motor, a compressor, and a pump. At least one object of the present invention is to enable the suspension rotor of a magnetic suspension device to meet the working requirements of high rotational speed, while achieving miniaturization and light weight of the magnetic suspension motor.
In order to achieve the above purpose, the present invention mainly provides the following technical solutions:
at least one embodiment of the present invention provides a magnetic levitation apparatus, including: the motor comprises a shell, and a rotor, a radial magnetic bearing, an axial magnetic bearing and a motor stator which are arranged on the inner side of the shell; the two sides of the central section of the rotor corresponding to the motor stator are provided with stepped structures, and the stepped structures on the two sides of the rotor are asymmetric structures.
For example, the diameters of the rotor parts between the two side stepped structures of the rotor are the same; the maximum step diameter of the step structure on one side of the rotor is the same as the diameter of the rotor part between the step structures on the two sides; and the maximum step diameter of the step structure on the other side of the rotor is larger than the diameter of the rotor between the step structures on the two sides.
For example, the diameter of the stepped structure on both sides of the rotor is smaller towards the rotor end on the side where the stepped structure is located.
For example, in the stepped structure of both sides of the rotor, the first step depth of the side having the largest step diameter is greater than the first step depth of the step of the other side; and the second step depth of the side having the largest step diameter is greater than the second step depth of the step of the other side.
For example, the side of the rotor where the diameter of the step is larger is disposed on the side opposite to the direction of the resultant axial force when the magnetic levitation motor to which the magnetic levitation apparatus is applied is in normal operation.
For example, the resultant force refers to the sum of all forces in the axial direction when the magnetic suspension motor works; and if the axial direction of the rotor is in a non-parallel relation with respect to the horizontal plane, the resultant force further comprises gravity.
For example, the stepped structure on both sides of the rotor has stepped surfaces, which are respectively opposite to the first axial magnetic bearing and the second axial magnetic bearing; and the first and second axial magnetic bearings generate an axial suction force on the stepped surface on the rotor.
For example, the motor stator is disposed adjacent the rotor mid-section, and the axial magnetic bearing is disposed closer to the rotor mid-section than the radial magnetic bearing.
For example, one end of the rotor is an output end.
For example, the other end of the rotor is also an output end.
For example, the two sides of the asymmetric design step structure are provided with groove structures.
At least one embodiment of the invention also provides a magnetic suspension motor, which comprises any magnetic suspension device and a working component arranged at least one end of the rotor, wherein the working component comprises an impeller.
For example, the magnetic levitation motor further includes an axial sensor disposed at a single side of the rotor, and a radial sensor disposed at both sides of the rotor.
At least one embodiment of the invention also provides a turbine motor system, which comprises the magnetic suspension motor.
At least one embodiment of the present invention further provides a motor rotor, which includes a middle section and two end sections respectively located outside the middle section, wherein stepped structures are provided on two sides of the middle section, and the stepped structures on the two sides are asymmetric structures.
For example, the diameters of the middle section parts between the two side step structures are the same; the maximum step diameter of the step structure on one side of the middle section is the same as the diameter of the middle section part between the step structures on the two sides; and the maximum step diameter of the step structure on the other side of the middle section is larger than the diameter of the middle section part between the step structures on the two sides.
For example, the diameter of the step structure on both sides of the middle section is smaller toward the ends of the end sections on the side where the step structure is located.
For example, in the two-sided stepped structure, the first step depth of the side having the largest step diameter is greater than the first step depth of the step of the other side; and the second step depth of the side having the largest step diameter is greater than the second step depth of the step of the other side.
For example, the two-sided stepped structure has a stepped surface.
Drawings
Fig. 1 is a schematic structural diagram of a magnetic levitation apparatus provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of an asymmetric magnetic levitation rotor structure provided by the embodiment of the invention;
FIG. 3 is a schematic diagram of an asymmetric magnetic levitation rotor structure provided by the embodiment of the invention;
FIG. 4 is a schematic diagram of an asymmetric magnetic levitation rotor structure provided by the embodiment of the invention;
FIG. 5 is a schematic diagram of an asymmetric magnetic levitation rotor structure provided by the embodiment of the invention;
FIG. 6 is a schematic diagram of an asymmetric magnetic levitation rotor structure provided by the embodiment of the invention; and
fig. 7 is a structural schematic diagram of an asymmetric magnetic suspension rotor structure in a groove form in a magnetic suspension device provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," "fourth," and the like in this disclosure is not intended to imply any order, quantity, or importance, but rather the intention is to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
As shown in fig. 1, an embodiment of the present invention provides a magnetic levitation apparatus, including: a housing 1, a rotor 2 located inside the housing, a first radial magnetic bearing 31, a second radial magnetic bearing 32, a first axial magnetic bearing 41, a second axial magnetic bearing 42, and a motor stator 5. Wherein, the radial magnetic bearing, the axial magnetic bearing and the motor stator belong to one part of the stator. When the magnetic suspension device works, the rotor is suspended in the stator.
As shown in fig. 1, most of the rotor 2, the first radial magnetic bearing 31, the second radial magnetic bearing 32, the first axial magnetic bearing 41, the second axial magnetic bearing 42, and the motor stator 5 are coaxially mounted inside the housing 1. For example, the rotor 2 is rotatable about the arrow a direction in the figure.
As further shown in fig. 1, stepped surfaces S1, S2 on both sides of the rotor 2 are opposed to the first axial magnetic bearing 41 and the second axial magnetic bearing 42, respectively. The first and second axial magnetic bearings 41,42 generate axial suction forces on the stepped surfaces S1, S2 on the rotor 2, respectively, by which axial contactless levitation of the rotor is controlled.
As shown in fig. 2, for example, the rotor 2 of the present invention has an asymmetric stepped structure at portions corresponding to the axial magnetic bearings on both sides thereof. Two steps are respectively arranged on each side of the stepped structures on the two sides of the rotor 2 and are matched with the axial magnetic bearing to generate axial suction. Wherein the first step 21 of the left stepped step has a depth of a1 and the second step 22 has a depth of a 2. The diameter of the first step 21 from the outermost side away from the rotor rotation axis a is larger than the diameter d1 of the rotor portion between the two side stepped structures. The depth of the first step 23 (or the third step 23) of the right step is b1, and the depth of the second step 24 (or the fourth step 24) is b 2. The diameter of the right first step 23 from the outermost side away from the axis of rotation a of the rotor 2 is equal in size to the diameter d1 of the rotor portion between the two side stepped structures.
In addition, the step depth of the two sides of the asymmetrical stepped structure of the rotor 2 is related to the axial stress of the motor applied by the rotor during operation. In order to achieve the size reduction and the weight reduction of the magnetic levitation motor, for example, the rotor diameter d1 is designed based on the side with smaller axial force, so the diameter of the first step 23 (or the third step 23) on the right side is equal to the rotor diameter d1 between the two stepped structures.
According to the inventor, the height of the step of the symmetrical step design in the existing design must be designed according to the side with larger axial stress, otherwise, the magnetic suspension motor cannot work normally. Therefore, the diameter between the two steps of the existing design is larger, and correspondingly, only the motor stator with the larger diameter can be selected to be installed in a matching way, so that the radial dimension of the motor stator is necessarily larger than that of the motor stator designed by the invention. Moreover, the symmetry design of the existing design also enables the thickness of the iron core of the axial magnetic bearing to be designed according to the side with larger axial stress, so that the length of the rotor in the axial direction is increased, the critical rotating speed of the rotor is reduced, and the increase of the rotating speed of the rotor is not facilitated.
The design of the present invention thus achieves a reduction in rotor diameter compared to prior designs. Correspondingly, the motor stator with smaller diameter can be selected to be mounted on the rotor with smaller diameter in a matching way, and the miniaturization of the magnetic suspension motor is realized.
Further, for example, not only is the step diameter reduced on the side where the axial force is small, but the thickness of the axial magnetic bearing is also reduced. The length of the rotor is reduced while the magnetic suspension working performance is not influenced, and the critical rotating speed of the rotor (the critical rotating speed of the rotor refers to the rotating speed which enables the rotor to generate strong vibration) is improved. Further, for example, because the rotor used for the magnetic suspension motor is often expensive, the design of the invention realizes the reduction of the diameter of the rotor, reduces the material consumption, and realizes the light weight of the magnetic suspension motor while controlling the cost of the magnetic suspension motor.
For example, the depth a1 of the left first step 21 is greater than the depth b1 of the right first step 23, and the depth a2 of the left second step 22 is greater than the right second step b 2.
It will be appreciated that the asymmetric stepped configuration is designed in relation to the desired axial stress during normal operation of the rotor. When the rotor is horizontally related to the mounting surface, as shown in fig. 3, when the axial resultant force F is directed to the right side in normal operation, the first step 21 and the second step 22 are designed on the left side of the rotor, and the third step 23 and the fourth step 24 are designed on the right side of the rotor. On the contrary, as shown in fig. 4, when the axial resultant force F is directed to the left side in normal operation, the first step 21 and the second step 22 are designed on the right side of the rotor, and the third step 23 and the fourth step 24 are designed on the left side of the rotor.
For example, the rotor need not be in a horizontal relationship with the underlying surface, e.g., when the rotor is not lying horizontally relative to the ground plane, as shown in FIG. 5, the resultant axial force also includes gravity. When the axial resultant force F is directed downward in normal operation, a first step 21 and a second step 22 are designed on the upper side of the rotor, and a third step 23 and a fourth step 24 are designed on the lower side of the rotor. Conversely, for example, as shown in fig. 6, when the resultant axial force F is directed upward during normal operation, the first step 21 and the second step 22 are designed on the lower side of the rotor, and the third step 23 and the fourth step 24 are designed on the upper side of the rotor.
However, embodiments of the present disclosure are not limited to the above-described manner of placement and use of the rotor. Correspondingly, when the rotor is placed at other angles relative to the horizontal plane, the corresponding step design can be correspondingly adjusted according to the direction of the axial resultant force when the rotor normally works.
For example, in the asymmetric stepped structure of the rotor 2, the step diameters on both sides of the rotor 2 are smaller toward the rotor ends on both sides of the rotor. That is, the closer the step diameter of the rotor 2 side is to the tip of the rotor on the side, the smaller the step diameter is. This design facilitates the machining of the rotor and the subsequent installation of the motor.
For example, referring to fig. 1 and 7, the motor stator 5 is installed near the middle section of the rotor 2, for example, the motor stator 5 is disposed around the rotor 2, or the rotor 2 is inserted into the stator 5. The first axial magnetic bearing 41 is located closer to the center of the rotor 2 than the first radial magnetic bearing 31, and the second axial magnetic bearing 42 is located closer to the center of the rotor than the second radial magnetic bearing 32. For example, in order to facilitate the machining of the rotor and the installation of the motor, the stepped diameters of both sides of the rotor 2 are smaller as they are closer to the rotor ends of both sides of the rotor 2. Therefore, in order to obtain a large magnetic force area, the axial magnetic bearing is installed near the center of the rotor, which is relatively large in diameter, so that a large magnetic force area is obtained.
For example, as shown in fig. 7, in order to prevent the magnetic leakage phenomenon, groove structures G1 and G2 may be further provided near the asymmetric design steps on both sides.
For example, embodiments of the present invention further provide a magnetic levitation motor, which includes a magnetic levitation device having an asymmetric stepped structure on both sides of a rotor as described in any of the above embodiments.
The magnetic suspension motor can be provided with working components at two ends of the rotor 2, or can be provided with the working components at one end only. For example, taking a two-stage centrifugal air compressor as an example, the two-stage centrifugal compressor using the magnetic suspension motor designed by the invention can be provided with working parts at both ends of the rotor. For example, in the case of a one-stage centrifugal compressor or centrifugal pump, the working element may be mounted only on one side and not on the other side. For example, the working component may be an impeller.
An axial sensor and a radial sensor are arranged in the magnetic suspension motor. For example, radial sensors may be mounted on both sides of the rotor and mounted in cooperation with radial magnetic bearings. For example, the axial sensor may be mounted only on the side of the rotor having the larger step diameter, because the magnetic force of the axial magnetic bearing on the side of the rotor having the larger step diameter is larger, and the requirement for the accuracy of the axial displacement is higher. Embodiments of the invention are not limited in this regard.
The magnetic suspension motor can obtain a larger rotating speed range through the magnetic suspension device, and the light weight and the miniaturization of the magnetic suspension motor are realized, so that the production and manufacturing cost is further reduced.
The magnetic levitation motor can be applied to a turbine motor system (such as a compressor, an expander, a pump for conveying fluid, and the like).
Embodiments of the present invention also provide a turbine motor system comprising a magnetic levitation motor as described above.
It should be noted that, in the case of no conflict, those skilled in the art may combine the related technical features in the foregoing examples or the examples according to the actual situation to achieve the corresponding technical effect, and specific details of various combining situations are not described herein again.
The foregoing is a description of exemplary embodiments of the present invention only, and is not intended to limit the present invention in any way, and any modifications, equivalents and variations of the foregoing embodiments according to the technical spirit of the present invention are included within the scope of the present invention as claimed.
Claims (19)
1. A magnetic levitation apparatus comprising: the motor comprises a shell, a rotor arranged on the inner side of the shell, a radial magnetic bearing, an axial magnetic bearing and a motor stator;
the two sides of the central section of the rotor corresponding to the motor stator are provided with stepped structures, and the stepped structures on the two sides of the rotor are asymmetric structures.
2. Magnetic levitation device as claimed in claim 1, wherein the rotor parts between the stepped structures on both sides of the rotor are of the same size in diameter;
the maximum step diameter of the step structure on one side of the rotor is the same as the diameter of the rotor part between the step structures on the two sides; and
the maximum step diameter of the step structure on the other side of the rotor is larger than the diameter of the rotor between the step structures on the two sides.
3. Magnetic levitation apparatus as claimed in claim 2, wherein the diameter of the step structure on both sides of the rotor is smaller towards the rotor end on the side where it is located.
4. The magnetic levitation device as recited in claim 2, wherein in the stepped structure of both sides of the rotor, a first step depth of one side having a maximum step diameter is greater than a first step depth of the other side step; and the second step depth of the side having the largest step diameter is greater than the second step depth of the step of the other side.
5. The magnetic levitation device as recited in claim 4, wherein the side of the rotor where the diameter of the step is larger is disposed at the side opposite to the direction of the resultant axial force when the magnetic levitation motor to which the magnetic levitation device is applied is normally operated.
6. Magnetic levitation apparatus as claimed in claim 5, wherein the resultant force is the sum of all forces in the axial direction when the magnetic levitation motor is in operation; and if the axial direction of the rotor is in a non-parallel relation with respect to the horizontal plane, the resultant force further comprises gravity.
7. The magnetic levitation device as recited in claim 4, wherein the stepped structure of both sides of the rotor has stepped faces respectively opposite to the first and second axial magnetic bearings; and the first and second axial magnetic bearings generate an axial suction force on the stepped surface on the rotor.
8. The magnetic levitation device as recited in claim 1, wherein the motor stator is disposed adjacent the rotor midsection and the axial magnetic bearing is disposed closer to the rotor midsection than the radial magnetic bearing.
9. The magnetic levitation device as recited in claim 1, wherein the rotor has an output end at one end.
10. Magnetic levitation apparatus as claimed in claim 9, wherein the other end of the rotor is also an output.
11. Magnetic levitation device as claimed in any of claims 1-10, wherein a groove structure is provided at the asymmetrically designed step structure at both sides.
12. A magnetically levitated motor comprising a magnetic levitation apparatus as claimed in any one of claims 1 to 11 and a working member disposed at least one end of the rotor, the working member comprising an impeller.
13. The magnetically suspended motor of claim 12, further comprising an axial sensor disposed on a single side of the rotor, and a radial sensor disposed on both sides of the rotor.
14. A turbine motor system comprising a magnetic levitation motor as claimed in claim 13.
15. The utility model provides a motor rotor, includes middle part section and the both ends section that is located outside the middle part section respectively, wherein, middle part section both sides all are provided with the echelonment structure, just both sides echelonment structure is asymmetric structure.
16. The rotor of claim 15, wherein the diameter of the middle section portion between the two side stepped structures is the same size;
the maximum step diameter of the step structure on one side of the middle section is the same as the diameter of the middle section part between the step structures on the two sides; and
the maximum step diameter of the step structure on the other side of the middle section is larger than the diameter of the middle section part between the step structures on the two sides.
17. The rotor of claim 16, wherein the middle section is flanked by two sides
The diameter of the step structure is smaller at the end of the end section on the side closer to the step structure.
18. The rotor of claim 17, wherein at said
In the step-shaped structure on the two sides, the first step depth of one side with the largest step diameter is larger than that of the step on the other side; and the second step depth of the side having the largest step diameter is greater than the second step depth of the step of the other side.
19. The rotor of claim 18, wherein the two-sided stepped structure
Has a stepped surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011535914.XA CN112671159B (en) | 2020-12-23 | 2020-12-23 | Motor rotor, magnetic suspension device, magnetic suspension motor and turbine motor system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011535914.XA CN112671159B (en) | 2020-12-23 | 2020-12-23 | Motor rotor, magnetic suspension device, magnetic suspension motor and turbine motor system |
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| CN112671159A true CN112671159A (en) | 2021-04-16 |
| CN112671159B CN112671159B (en) | 2026-02-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113224900A (en) * | 2021-05-10 | 2021-08-06 | 鑫磊压缩机股份有限公司 | Magnetic suspension high-speed asynchronous motor without thrust disc |
| CN113315301A (en) * | 2021-05-10 | 2021-08-27 | 鑫磊压缩机股份有限公司 | Magnetic suspension high-speed asynchronous motor |
| CN113346671A (en) * | 2020-12-23 | 2021-09-03 | 苏州苏磁智能科技有限公司 | Magnetic suspension device, magnetic suspension motor and turbine motor system |
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| CN112671159B (en) | 2026-02-24 |
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