CN113328559A - Magnetic suspension motor, magnetic suspension compressor and turbine motor with high effective magnetic force area - Google Patents
Magnetic suspension motor, magnetic suspension compressor and turbine motor with high effective magnetic force area Download PDFInfo
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- CN113328559A CN113328559A CN202110798322.5A CN202110798322A CN113328559A CN 113328559 A CN113328559 A CN 113328559A CN 202110798322 A CN202110798322 A CN 202110798322A CN 113328559 A CN113328559 A CN 113328559A
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- magnetic
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- magnetic force
- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
Abstract
The invention discloses a magnetic suspension motor, a magnetic suspension compressor and a turbine motor with high effective magnetic force area, which comprise a shell, wherein the shell comprises: a rotor, a motor stator; the rotor is arranged in the shell through a radial magnetic bearing and an axial magnetic bearing; the convex structures perpendicular to the axial direction of the rotor extend outwards from the rotor; the axial magnetic bearing comprises a coil which generates a magnetic field after being electrified; the magnetic conductive material wrapped outside the coil is magnetized and forms a magnetic circuit; the magnetic conductive material is annularly wrapped and a gap is reserved between the two end parts, so that the side surface formed by the two end parts is discontinuous, and the effective magnetic force area is increased by reducing the gap; and the convex structure is opposite to the discontinuous side surface of the magnetic conducting material so that the magnetic force formed on the side surface flows onto the convex structure and forms the magnetic circuit with the magnetic force on the other surface of the magnetic conducting material. On the basis of not changing the length and the shape of a thrust disc of the traditional design, the scheme only increases the effective magnetic force area by changing the shape of the magnetic conductive material of the axial magnetic bearing, and simultaneously, the silicon steel sheet has a chamfer design and effectively prevents the magnetic leakage condition.
Description
Technical Field
The invention relates to the technical field of magnetic suspension motors, in particular to a magnetic suspension motor, a magnetic suspension compressor and a turbine motor with high effective magnetic force area.
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. Magnetic levitation motors are used in turbine motor systems (e.g., compressors, expanders, pumps for delivering fluids, 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 thrust disc structure usually adopted by the existing design comprises a shell, a rotor, an axial magnetic bearing assembly, a thrust disc, an axial magnetic bearing, a radial magnetic bearing and a motor stator. One side of the rotor is provided with a thrust disc, and two sides of the thrust disc are provided with symmetrical axial magnetic bearings. In this design, the area of the coil facing the thrust disc occupies a large part, and this area is the area of the ineffective magnetic force, and in order to obtain the required area of the effective magnetic force, the radial size of the thrust disc needs to be further increased, which directly results in that the rotating speed of the magnetic suspension motor is limited by the diameter of the thrust disc. Meanwhile, the thrust disc with the large radial size is not beneficial to realizing the miniaturization and light weight of the magnetic suspension motor, so that the size of the magnetic suspension motor body can not be further reduced, and the overall production cost of the product is improved.
Therefore, there is an urgent need to invent a magnetic suspension motor with large effective magnetic force area, light weight, miniaturization and high rotating speed.
Disclosure of Invention
The technical scheme of the invention is as follows: a magnetic suspension motor, a magnetic suspension compressor and a turbine motor with high effective magnetic force area are provided. At least one object of the present invention is to enable a magnetic levitation rotor levitation apparatus to meet the work requirement of high rotational speed, while achieving miniaturization and weight reduction of a magnetic levitation motor, increasing an effective magnetic force area and preventing the occurrence of a magnetic flux leakage phenomenon. The magnetic suspension motor designed according to the invention can be applied to turbomachines such as compressors and pumps.
What relate to in this scheme: a high effective magnetic force area magnetic levitation motor comprising: the magnetic bearing comprises a shell, a rotor positioned on the inner side of the shell, a radial magnetic bearing, an axial magnetic bearing and a motor stator, wherein the rotor is positioned on the inner side of the shell;
the rotor is arranged in the shell through a radial magnetic bearing and an axial magnetic bearing;
the convex structures perpendicular to the axial direction of the rotor extend outwards from the rotor;
the axial magnetic bearing comprises a coil which generates a magnetic field after being electrified; the magnetic conductive material wrapped outside the coil is magnetized and forms a magnetic circuit;
the magnetic conductive material is annularly wrapped and a gap is reserved between the two end parts, so that the side surface formed by the two end parts is discontinuous, and the effective magnetic force area is increased by reducing the gap;
and the convex structure is opposite to the discontinuous side surface of the magnetic conducting material so that the magnetic force formed on the side surface flows onto the convex structure and forms the magnetic circuit with the magnetic force on the other surface of the magnetic conducting material.
Preferably, the projection structure includes a side surface portion opposite to the corresponding axial magnetic bearing; the discontinuous surface formed on the magnetic conductive material is opposite to the side surface part.
Preferably, the axial magnetic bearing includes the magnetic conductive material and the coil, and the magnetic conductive material is an unclosed annular structure including two end portions close to each other.
Preferably, the magnetic conductive material comprises a first soft magnetic material and a second soft magnetic material; the second soft magnetic material forms a semi-surrounding structure which is wound on the coil; the first soft magnetic material is spliced with the second soft magnetic material to form an integral surround for the coil.
Preferably, the gap is maintained between the end of the first soft magnetic material as the magnetically permeable material and the front end of the second soft magnetic material.
Preferably, the gap is greater than 1/50 of the coil thickness.
Preferably, the protrusion structure is a thrust disc disposed on the rotor or a central section of the rotor body extending from both ends thereof.
Preferably, the end surface of the magnetic conductive material near the surface of revolution of the rotor shaft is chamfered to avoid magnetic leakage.
Preferably, the effective magnetic force areas on the two sides of the thrust disc can be designed according to the stress conditions on the two sides, and can also be designed according to the side with larger stress on the two sides as a reference.
Preferably, the chamfer is formed by a chamfer formed on the rotor radial surface, the chamfer being formed on the rotor radial surface.
A magnetic suspension compressor comprises a power assembly, an impeller and a guide vane; the power assembly comprises the magnetic suspension motor in any scheme, and the magnetic suspension motor comprises a rotor and an axial magnetic bearing.
A turbine motor comprising a magnetic levitation motor according to any of the above aspects.
The invention has the advantages that:
1. on the basis of not changing the length of the thrust disc of the traditional design, the effective magnetic force area is increased only by changing the shape of the silicon steel sheet of the axial magnetic bearing, and meanwhile, the silicon steel sheet is provided with a chamfer angle design to effectively prevent the magnetic leakage condition. Can generate larger attraction force by using smaller current and make the coil generate less heat
2. In order to avoid the magnetic leakage phenomenon, the radial distance from the rotating shaft is relatively far, and although the effective magnetic force area cannot be set to the maximum, the magnetic leakage prevention capability is more excellent.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic diagram of an axial magnetic axis structure of a conventional magnetic levitation motor;
FIG. 2 is a schematic view of an axial magnetic axis structure of a magnetic levitation motor for increasing an effective magnetic force area;
FIG. 3 is a schematic diagram of another embodiment of an axial magnetic axis structure of a magnetic levitation motor for increasing an effective magnetic force area;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is an enlarged view of a portion of FIG. 2;
FIG. 6 is a diagram showing a combined state of a first annular soft magnetic material and a second annular soft magnetic material;
FIG. 7 is a schematic view of a motor shaft with the scheme installed at both ends of a rotor;
FIG. 8 is a schematic view of an embodiment of an axial magnetic bearing closer to the center of the rotor shaft;
FIG. 9 is a schematic view of an embodiment of a magnetic permeable material with three chamfers;
FIG. 10 is a schematic diagram of the arrangement of the axial magnetic axis structure of a magnetic suspension motor in vertical axial arrangement;
wherein: 1a, a shell; 2a, a rotor; 3a, an axial magnetic bearing component; 31a/31b, a thrust disc; 32a/32b, axial magnetic bearing; 321a, a first ring-shaped soft magnetic material; 322a, a second ring-shaped soft magnetic material; 323a, a coil; 324a, an insulating material; 4a/4b, radial magnetic bearing; 5a and a motor stator.
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," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used 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.
Example 1:
a magnetic levitation motor with high effective magnetic force area comprises a housing 1a, a rotor 2a located inside the housing, an axial magnetic bearing assembly 3a, a radial magnetic bearing 4a and a motor stator 5a, wherein the axial magnetic bearing assembly 3a comprises a thrust disc 31a and an axial magnetic bearing 32 a.
Both sides of the thrust disc 31a are provided with axial magnetic bearings 32 a. The rotor 2a, the axial magnetic bearing assembly 3a, the thrust disc 31a, the radial magnetic bearing 4a, and the motor stator 5a are all coaxially mounted inside the housing 1 a.
The axial magnetic bearing and the radial magnetic bearing are fixedly connected with a motor stator, the thrust disc is positioned on the rotor, and the rotor is suspended in the motor stator and rotates around the axis X of the rotor.
The thrust disk may be designed as a planar disk structure and opposite a corresponding face of a corresponding axial magnetic bearing to generate an axial suspension force. However, the embodiments disclosed in the present application are not limited thereto, and for example, the surface of the thrust disc opposite to the axial magnetic bearing may be designed in other non-planar structures, such as a partial arc shape, other steps of an inclined stepped table surface, and the like.
The thrust disk may be formed separately or integrally with the rotor. The thrust disk and the rotor are made of a magnetically conductive material, such as an alloy structural steel, but the embodiments disclosed herein are not limited thereto.
As shown in fig. 1 to 3, both side surfaces of the thrust disk are in the form of planes, and a magnetic force direction generated by magnetization of the energized coil is formed in the thrust disk. The side plane of the thrust disc corresponds to the axial magnetic bearing, and a magnetic circuit formed when the energized coil magnetizes the axial magnetic bearing can form a closed loop with the thrust disc corresponding to the corresponding side plane. Specifically, the object of coil magnetization is a magnetic conductive material wrapping the coil, the magnetic conductive material generates magnetic force, and if a thrust disc with the same magnetic conductivity is not provided, the magnetic conductive material wrapping the coil forms a self-closing magnetic circuit. Finally, the axial magnetic bearing controls the axial displacement of the rotor through the process.
The total amount of magnetic force generated by a certain number of turns of the coil under a certain current is certain, that is, the smaller the closed magnetic circuit of the magnetic conductive material surrounding the coil is, the larger the magnetic force flowing to the convex structure is. That is, a greater attraction force can be generated with a smaller current and the coil is made to generate less heat. This is also the reason why the surface of the magnetic conductive material surrounding the coil is not continuous, otherwise the magnetic circuit is mostly self-closed in the magnetic conductive material surrounding the coil (short circuit of the magnetic circuit), the magnetic force generated to the protrusion structure is not large enough or even disappears, and this phenomenon is leakage flux.
On the basis of the above principle, the thrust disc of the traditional design is not changed, the shape of the magnetic conductive material in the axial magnetic bearing is changed, the effective magnetic force area is increased through the shape arrangement, and meanwhile, the occurrence of the magnetic leakage situation is effectively prevented through the shape arrangement.
As shown in fig. 1-3, the axial magnetic bearing includes a magnetically conductive material, at least two side planes of which are respectively opposite to the side planes of the thrust disk. Embodiments of the present disclosure are not limited thereto.
The structure of the magnetic conductive material opposite to the side plane of the thrust disc forms an approximately continuous plane arrangement, namely, when the magnetic conductive material is wound on the coil, a gap is formed between two end parts which are not closed, and the two end parts form an approximately continuous plane, so that the effective magnetic force area can be increased to the maximum extent, and certainly, under the condition of not generating magnetic leakage.
Therefore, based on the gap formed by the two end portions, the size of the gap is generally larger than 1/50 of the thickness of the coil in the axial direction of the rotor, so that leakage flux can be ensured without the maximum effective magnetic force area. In order to reduce magnetic leakage, one end part is prepared into a chamfer inclined plane, so that the facing area of two opposite surfaces is reduced, and the magnetic leakage condition can be reduced.
As shown in fig. 6, the magnetic conductive material includes a first ring-shaped soft magnetic material 321a (i.e., a first soft magnetic material) and a second ring-shaped soft magnetic material 322a (i.e., a second soft magnetic material). The axial magnetic bearing assembly 3a also includes coils 323a and insulating material 324 a. The coil is mounted between the first and second annular soft magnetic materials. The insulating material insulates the coil from the soft magnetic material component. The first annular soft magnetic material and the second annular soft magnetic material are spliced to form a discontinuous plane which is opposite to the side plane on the thrust disc.
The lower part of the first annular soft magnetic material 321a and the lower part of the second annular soft magnetic material 322a are both provided with a slope away from the rotor surface. The first annular soft magnetic material 321a is closer to the rotor center than the second annular soft magnetic material 322 a. Wherein the first annular soft magnetic material 321a can be connected with the second annular soft magnetic material 322a by a fastener or an adhesive.
Shown in fig. 6 is attachment by fasteners 3211. The first annular soft magnetic material 321a B and the second annular soft magnetic material 322a are both provided with structures for preventing magnetic leakage. The design of the structure for preventing the magnetic leakage is realized in the embodiment in a chamfer mode, the structural design ensures that the radial relative area of the axial magnetic bearing and the rotor is reduced, and the magnetic leakage phenomenon can be effectively prevented.
The insulating material 324a is installed between the first and second ring-shaped soft magnetic materials 322a and the coil 323a to perform an insulating function. For example, as shown in fig. 2 to 6, the lower portion B of the first annular soft magnetic material and the lower portion a of the second annular soft magnetic material are each provided with a slope away from the rotor, which prevents the occurrence of the magnetic flux leakage phenomenon while reducing the undesirable radial levitation force.
It should be understood that soft magnetic materials as used in this application are materials that have a large permeability, are easy to magnetize, have a large saturation induction, have a small coercivity (Hc), have a narrow and long hysteresis loop area, and have a small loss (HdB area is small) relative to hard magnetic materials. Soft magnetic materials include pure magnets, silicon steel sheets, permalloy (Fe, Ni) ferrites, electrical pure iron, and the like.
The effective magnetic force areas on the left and right sides of the thrust disc 31a can be designed according to the stress conditions on the two sides, and can also be designed according to the side with larger stress on the two sides as a reference. As shown in fig. 10, when the motor is placed in a manner that the axial direction of the motor is vertical to the ground, the sizes of the axial magnetic bearings on both sides of the thrust disk may be designed to be different, and the effective area of the axial magnetic bearing on the upper side of the thrust disk, which is far from the ground, is larger than that of the axial magnetic bearing on the lower side of the thrust disk, because the axial magnetic bearing on the upper side of the thrust disk, which is far from the ground, needs to bear the gravity of the rotor, so that the effective magnetic area; the area of the axial magnetic bearing close to the ground on the lower side of the thrust disc is smaller than the effective magnetic force area of the axial magnetic bearing on the last time of the thrust disc. The effective magnetic force areas on the two sides of the thrust disc can be designed to be the same, and the axial magnetic bearing is designed according to the side with the larger effective magnetic force area, so that the axial magnetic bearing has the advantages that only one set of die is required to be opened, and the defect is that materials are wasted. When the motor is not axially vertical to the ground, the effective magnetic force area can be selectively designed according to the axial actual load of the rotor.
There are many applications in industry where axial magnetic bearings can only be designed on one side and the embodiments of the above-described inventive design are directed to solutions where the axial magnetic bearing assembly is provided on only one side of the rotor. With the same design principle, axial magnetic bearing assemblies can also be provided on both sides of the rotor.
As shown in fig. 7, thrust disks 31a, 31b of a stepped design are mounted at both ends of the rotor 2a, and corresponding axial magnetic bearings 32a, 32b are mounted at the corresponding thrust disks 31a, 31 b.
Further, for example, the thrust disk and the rotor may be integrated and designed as a single unit. In other words, as shown in fig. 8, the central section of the rotor is directly designed to protrude from the central sections of the two side sections and respectively correspond to the respective axial magnetic bearings.
The lower part of first annular soft magnetic material with the lower part of the annular soft magnetic material of second all is provided with keeps away from the inclined plane of rotor surface, and the effect on inclined plane is in order to reduce the magnetic leakage phenomenon when increasing with thrust disc side relative area. The leakage flux in the solutions shown in fig. 4 and 6 has two positions, one is the leakage flux generated between the rotor (i.e., position a), and the other is the leakage flux phenomenon itself (i.e., position B), so there are two chamfers. Similarly, the solution shown in fig. 9 includes three chamfers.
The ramp is located on a side of the rotor closest to the radial surface of the rotor that is adjacent to the lobe formation or the thrust disc side plane.
It should be noted that, because the axial magnetic bearings are distributed at both ends of the rotor, the rotor designed by the present invention has a characteristic that the diameter is gradually reduced from the center of the rotor to the end of the rotor, so as to facilitate the assembly, machining and manufacturing of the magnetic levitation motor. To ensure a magnetic force area in the axial direction, the axial magnetic bearing assembly is closer to the center of the rotor in the axial direction than the radial magnetic bearing.
The magnetic levitation motor may comprise, in addition to the magnetic levitation means described above, other working components, such as an impeller, arranged at least one end of the rotor.
According to an embodiment of the present disclosure, there is also provided a turbine motor system including the magnetic levitation motor. The turbine motor system includes, for example, a compressor, an expander, a pump for delivering a fluid, and the like.
The embodiments are merely illustrative of the principles and effects of the present invention, and do not limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed herein be covered by the appended claims.
Claims (10)
1. A high effective magnetic force area magnetic levitation motor comprising:
a housing;
a rotor disposed within the housing through a radial magnetic bearing and an axial magnetic bearing;
and, a motor stator;
wherein:
the convex structures perpendicular to the axial direction of the rotor extend outwards from the rotor;
the axial magnetic bearing comprises a coil which generates a magnetic field after being electrified; the magnetic conductive material wrapped outside the coil is magnetized and forms a magnetic circuit;
the magnetic conductive material is annularly wrapped, a gap is reserved between the two end parts, so that the side surface formed by the two end parts is discontinuous, and the gap is reduced to increase the area opposite to the protruding structure, namely the effective magnetic force area is increased;
and the convex structure is opposite to the discontinuous side surface on the magnetic conducting material so that the magnetic force flows to the convex structure and forms the magnetic circuit with the magnetic force on other surfaces on the magnetic conducting material.
2. A high effective magnetic force area maglev motor according to claim 1, wherein: the convex structure comprises a side surface part opposite to the corresponding axial magnetic bearing; the discontinuous surface formed on the magnetic conductive material is opposite to the side surface part.
3. A high effective magnetic force area maglev motor according to claim 1, wherein: the axial magnetic bearing comprises the magnetic conductive material and the coil, wherein the magnetic conductive material is of an unclosed annular structure and comprises two end parts which are close to each other.
4. A high effective magnetic force area maglev motor according to claim 3, wherein: the magnetic conduction material comprises a first soft magnetic material and a second soft magnetic material; the second soft magnetic material forms a semi-surrounding structure which is wound on the coil; the first soft magnetic material is spliced with the second soft magnetic material to form an integral surround for the coil.
5. A high effective magnetic force area maglev motor according to claim 4, wherein: the gap is kept between the end part of the first soft magnetic material as the magnetic conduction material and the front end of the second soft magnetic material.
6. A high effective magnetic force area magnetic levitation motor as recited in any one of claims 1-5 wherein: the gap is greater than 1/50 of the thickness of the coil in the rotor axial direction.
7. A high effective magnetic force area magnetic levitation motor as recited in any one of claims 1-5 wherein: the convex structure is a thrust disc arranged on the rotor or a central section of the rotor body which is higher than the two ends of the rotor body.
8. A high effective magnetic force area magnetic levitation motor as recited in any one of claims 1-5 wherein: the effective magnetic force areas on the two sides of the protruding structure can be respectively designed according to the stress conditions of the two sides, and can also be designed according to the side with larger stress on the two sides as a reference.
9. A high effective magnetic force area magnetic levitation motor as recited in any one of claims 1-5 wherein: the end face of the magnetic conductive material close to the rotating surface of the rotor shaft avoids magnetic leakage in the form of an inclined chamfer face.
10. A high effective magnetic force area magnetic levitation motor as recited in any one of claims 9, wherein: the closest of the angled chamfer and the rotor radial surface is located on a side of the raised formation side plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110798322.5A CN113328559A (en) | 2021-07-15 | 2021-07-15 | Magnetic suspension motor, magnetic suspension compressor and turbine motor with high effective magnetic force area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110798322.5A CN113328559A (en) | 2021-07-15 | 2021-07-15 | Magnetic suspension motor, magnetic suspension compressor and turbine motor with high effective magnetic force area |
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| CN113328559A true CN113328559A (en) | 2021-08-31 |
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| CN202110798322.5A Pending CN113328559A (en) | 2021-07-15 | 2021-07-15 | Magnetic suspension motor, magnetic suspension compressor and turbine motor with high effective magnetic force area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898604A (en) * | 2021-10-09 | 2022-01-07 | 广东美的暖通设备有限公司 | Bearing system, refrigeration equipment, centrifugal compressor and control method and device of centrifugal compressor |
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|---|---|---|---|---|
| EP0411696A2 (en) * | 1989-08-04 | 1991-02-06 | The Glacier Metal Company Limited | Magnetic thrust bearings |
| JPH07317766A (en) * | 1994-05-30 | 1995-12-08 | Samsung Electro Mech Co Ltd | Magnetic thrust-bearing |
| JPH08128445A (en) * | 1994-11-02 | 1996-05-21 | Hitachi Ltd | Thrust magnetic bearing and centrifugal compressor |
| JP2002122139A (en) * | 2000-10-10 | 2002-04-26 | Honda Motor Co Ltd | Thrust magnetic bearing and flywheel battery device |
| CN112467932A (en) * | 2020-10-29 | 2021-03-09 | 常州工学院 | High-speed fan with hybrid support of air bearing and magnetic bearing |
-
2021
- 2021-07-15 CN CN202110798322.5A patent/CN113328559A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0411696A2 (en) * | 1989-08-04 | 1991-02-06 | The Glacier Metal Company Limited | Magnetic thrust bearings |
| JPH07317766A (en) * | 1994-05-30 | 1995-12-08 | Samsung Electro Mech Co Ltd | Magnetic thrust-bearing |
| JPH08128445A (en) * | 1994-11-02 | 1996-05-21 | Hitachi Ltd | Thrust magnetic bearing and centrifugal compressor |
| JP2002122139A (en) * | 2000-10-10 | 2002-04-26 | Honda Motor Co Ltd | Thrust magnetic bearing and flywheel battery device |
| CN112467932A (en) * | 2020-10-29 | 2021-03-09 | 常州工学院 | High-speed fan with hybrid support of air bearing and magnetic bearing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898604A (en) * | 2021-10-09 | 2022-01-07 | 广东美的暖通设备有限公司 | Bearing system, refrigeration equipment, centrifugal compressor and control method and device of centrifugal compressor |
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