CN111173838A - Radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing - Google Patents
Radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing Download PDFInfo
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- CN111173838A CN111173838A CN202010055294.3A CN202010055294A CN111173838A CN 111173838 A CN111173838 A CN 111173838A CN 202010055294 A CN202010055294 A CN 202010055294A CN 111173838 A CN111173838 A CN 111173838A
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- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000000725 suspension Substances 0.000 claims abstract description 53
- 238000004804 winding Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 22
- 230000003068 static effect Effects 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 2
- 238000007667 floating Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0485—Active magnetic bearings for rotary movement with active support of three degrees of freedom
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0459—Details of the magnetic circuit
- F16C32/0461—Details of the magnetic circuit of stationary parts of the magnetic circuit
- F16C32/0465—Details of the magnetic circuit of stationary parts of the magnetic circuit with permanent magnets provided in the magnetic circuit of the electromagnets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/047—Details of housings; Mounting of active magnetic bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing which comprises a radial stator, an axial stator and a rotor positioned in an inner ring of the stator, wherein the radial stator consists of a left radial iron core and a right radial iron core; the left radial iron core and the right radial iron core are respectively and uniformly distributed with two suspension teeth along the inner circumference; the outer sides of the left stator core and the right stator core are respectively provided with a left radial magnetized permanent magnet ring and a right radial magnetized permanent magnet ring; centralized radial control windings are wound on the suspension teeth; the axial stator consists of a left axial iron core and a right axial iron core; axial control windings which are connected in series are arranged on two sides of the left radial iron core and the right radial iron core and close to the inner side of the axial stator; the rotor includes a cylindrical rotor core and a rotating shaft. The invention provides static bias magnetic flux under the action of the permanent magnet ring, and the radial control magnetic flux generated by electrifying the radial control winding regulates the corresponding bias magnetic flux; the hybrid magnetic bearing with the structure is independently designed in X and Y directions, realizes no coupling of suspension force in the X-Y direction, and is simple to control.
Description
Technical Field
The invention relates to a non-mechanical contact magnetic bearing, in particular to a radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing which can be used as a non-contact suspension support of high-speed transmission components such as a flywheel system, a machine tool electric spindle, a centrifugal machine and the like.
Background
The magnetic bearing is a novel high-performance bearing which suspends a rotor in a space by utilizing electromagnetic force between a stator and the rotor so that the stator and the rotor are not in mechanical contact. Currently, magnetic bearings are classified into the following three types according to the manner in which magnetic force is provided: (1) the active magnetic bearing generates a bias magnetic field by bias current, and the control magnetic flux generated by the control current is mutually superposed with the bias magnetic flux so as to generate controllable suspension force, and the magnetic bearing has larger volume, weight and power consumption; (2) the passive magnetic bearing has the advantages that the suspension force is completely provided by the permanent magnet, the required controller is simple, the suspension power consumption is low, but the rigidity and the damping are small, and the passive magnetic bearing is generally applied to supporting an object in one direction or reducing the load acting on the traditional bearing; (3) the hybrid magnetic bearing adopts permanent magnetic materials to replace electromagnets in an active magnetic bearing to generate a bias magnetic field, and control current only provides control magnetic flux for balancing load or interference, thereby greatly reducing the power loss of the magnetic bearing, reducing the volume of the magnetic bearing, lightening the weight of the magnetic bearing and improving the bearing capacity.
The structural commonality of the existing hybrid magnetic bearing is a single-chip structural design that all radial suspension teeth are on the same plane, and the radial suspension teeth wind a control winding to generate radial control magnetic flux which interacts with corresponding bias magnetic flux to generate radial suspension force. The radial two-degree-of-freedom suspension of the hybrid magnetic bearing with the structure is realized in a single piece, so that the suspension force is coupled in the XY direction, and the control is complex.
Disclosure of Invention
The invention aims to provide a radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing which is simplified and controlled, has a compact structure and is convenient to manufacture and assemble.
The invention is realized by the following technical scheme:
a radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing comprises a radial stator, an axial stator and a rotor positioned in an inner ring of the stator, wherein the radial stator comprises a left radial iron core and a right radial iron core, and the rotor comprises a rotor iron core and a rotating shaft; the left radial iron core is uniformly provided with two suspension teeth along the inner circumference and at the positions symmetrical to the directions of the + x axis and the-x axis; two suspension teeth are uniformly distributed at the positions of the right radial iron core, which are aligned with the + y axis and the-y axis along the inner circumference; the four suspension teeth are all of a zigzag structure, one end face, close to the rotor core, of each suspension tooth is matched with the circumferential face of the rotor core, the suspension teeth are the same as the rotor core in axial width and are opposite to the rotor core in position, and radial air gaps with the same air gap length are formed between the suspension teeth and the rotor core; centralized radial control windings are wound on the suspension teeth; the outer sides of the left radial iron core and the right radial iron core are respectively provided with a left radial magnetized permanent magnet ring and a right radial magnetized permanent magnet ring;
the axial stator comprises a left axial iron core and a right axial iron core, the inner diameters of the left and right axial iron cores are the same as the outer diameters of the left and right radial magnetized permanent magnetic rings, and the left and right radial magnetized permanent magnetic rings are respectively sleeved with the left and right axial iron cores; and a pair of axial control windings which are connected in series with each other are arranged on the outer sides of the left radial iron core and the right radial iron core and close to the inner ring walls of the left axial iron core and the right axial iron core, and the rotating shaft penetrates through the rotor iron core, the left axial iron core, the right axial iron core, the left radial iron core and the right radial iron core.
Furthermore, the left axial iron core and the right axial iron core are arranged oppositely, sealing surfaces are arranged on one side surface of the left axial iron core and the other side surface of the right axial iron core which is relatively far away from the left axial iron core, the sealing surfaces on the left axial iron core and the right axial iron core both use the center as a circle center to inwards extend to form a cylindrical ring, the inner diameter of the cylindrical ring is slightly larger than the outer diameter of the rotating shaft and extends to a position close to the rotor iron core, and a left axial air gap and a right axial air gap are.
Further, the left axial air gap is the same width as the right axial air gap.
Further, the left radial iron core, the right radial iron core, the left axial iron core, the right axial iron core and the rotor iron core are all made of magnetic conductive materials;
furthermore, the left and right radial magnetized permanent magnetic rings are made of rare earth permanent magnetic materials.
Has the advantages that:
1. the invention provides static bias magnetic flux under the action of the permanent magnet ring, and the radial control magnetic flux generated by electrifying the radial control winding regulates the corresponding bias magnetic flux; the hybrid magnetic bearing with the structure is independently designed in X and Y directions, adopts a double-sheet structure, and designs the suspension teeth into a zigzag structure, so that the suspension teeth in the X direction and the Y direction are coplanar with the rotor core, the suspension force is not coupled in the X-Y direction, and the control is simple.
2. The invention adds a pair of axial stators, so that the hybrid magnetic bearing of the invention generates three degrees of freedom.
Drawings
FIG. 1 is a structural diagram of a radial non-coupling three-degree-of-freedom DC hybrid magnetic bearing according to the present invention;
FIG. 2 is a schematic view of a left and right axial core of the present invention;
fig. 3 is a suspension magnetic flux diagram of the radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing of the present invention.
1-left radial core, 101-floating tooth a, 102-floating tooth B, 2-right radial core, 201-floating tooth C, 202-floating tooth D, 3-left axial core, 301-left closed face, 302-left cylindrical ring, 4-right axial core, 401-right closed face, 402-right cylindrical ring, 5-left radial magnetized permanent magnet ring, 6-right radial magnetized permanent magnet ring, 7-left axial control winding, 8-radial control winding, 9-right axial control winding, 10-rotor core, 11-rotating shaft, 12-static bias magnetic flux, 13-right axial air gap, 14-radial air gap, 15-axial control magnetic flux, 16-left axial air gap.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are 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 the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The specific structure is shown in fig. 1, and the radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing disclosed by the invention comprises a radial stator, an axial stator and a rotor positioned in an inner ring of the stator.
The radial stator comprises a left radial iron core 1 and a right radial iron core 2, the left radial iron core 1 and the right radial iron core 2 are of circular ring structures with the same size, two suspension teeth are uniformly distributed on the left radial iron core 1 along the inner circumference and are respectively marked as suspension teeth A101 and suspension teeth B102, and the suspension teeth A101 and the suspension teeth B102 are respectively aligned with the + x axis direction and the-x axis direction. Two suspension teeth, namely a suspension tooth C201 and a suspension tooth D202, are uniformly distributed on the right radial iron core 2 along the inner circumference, and the suspension tooth C201 and the suspension tooth D202 are respectively aligned with the + y axis direction and the-y axis direction. Referring to the attached drawing 1, namely, the suspension teeth a and B are located at two ends of the diameter of the inner ring of the left radial iron core 1, the suspension teeth C and D are located at two ends of the diameter of the inner ring of the right radial iron core 2, and the connecting line of the suspension teeth a and B is perpendicular to the connecting line of the suspension teeth C and D.
The rotor includes a cylindrical rotor core 10 and a rotating shaft 11, and the rotating shaft 11 penetrates through the rotor core 10.
And left and right radial magnetized permanent magnetic rings (5, 6) are respectively arranged on the outer sides of the left and right radial iron cores (1, 2). The four suspension teeth a101, B102, C201 and D202 are all zigzag structures, see fig. 3. The suspension teeth a101, the suspension teeth B102, the suspension teeth C201, and the suspension teeth D202 are overlapped with the orthographic projection of the left and right edges of the vertical portion of the rotor core 10, that is, one end of each of the four suspension teeth close to the rotor core 10 is the same as the axial width of the rotor core 10 and is opposite to the axial width of the rotor core 10, and the end surfaces of the four suspension teeth close to the rotor core 10 are arc-shaped end surfaces, and the radian of the end surfaces is matched with the radian of the circumferential surface of the. Radial air gaps 14 having the same air gap length are formed between the four floating teeth and the rotor core 10. And the suspension teeth A101, B102, C201 and D202 are wound with centralized radial control windings 8.
The axial stator comprises a left axial iron core 3 and a right axial iron core 4, the left axial iron core 3 and the right axial iron core 4 are of annular structures which are oppositely arranged and have the same outer diameter, a left closed surface 301 is arranged on the left side surface of the left axial iron core 3, and a right closed surface 401 is arranged on the side surface of the right axial iron core 4. Thus, the left axial iron core 3 and the right axial iron core 4 are combined to form a cylinder, the sealing surfaces on the left and right axial iron cores (3, 4) both extend inwards to form a cylinder ring by taking the center of a circle as the center, referring to fig. 2, the left sealing surface 301 of the left axial iron core 3 extends towards one side close to the right axial iron core 4 by taking the center point as the origin to form a left cylinder ring 302, and the right sealing surface 401 of the right axial iron core 4 extends towards one side close to the left axial iron core 3 by taking the center point as the origin to form a right cylinder ring 402. The inner diameters of the left cylindrical ring 302 and the right cylindrical ring 402 are slightly larger than the outer diameter of the rotating shaft 11, and the rotating shaft 11 penetrates through the left cylindrical ring 302 and the right cylindrical ring 402 after penetrating through the rotor core 10. Left cylindrical ring 302 is adjacent to the left side of rotor core 10 and forms a left axial air gap 16 with the left side of rotor core 10, and right cylindrical ring 402 is adjacent to the right side of rotor core 10 and forms a right axial air gap 13 with the right side of rotor core 10. The left axial air gap 16 is the same width as the right axial air gap 13.
The inner diameters of the circular rings of the left and right axial iron cores (3, 4) are the same as the outer diameters of the left and right radial magnetized permanent magnetic rings (5, 6), so that the left axial iron core 3 is sleeved on the left radial magnetized permanent magnetic ring 5, and the right axial iron core 4 is sleeved on the right radial magnetized permanent magnetic ring 6. Because the left and right side surfaces of the left and right axial iron cores (3, 4) are respectively provided with a closed surface, the left and right radial magnetized permanent magnet rings (5, 6), the left and right radial iron cores (1, 2), the rotor iron core 10 and the like are respectively arranged in the left and right axial iron cores (3, 4), see the attached figure 2.
A left axial control winding 7 is arranged on the left side of a left radial iron core 1 and close to a left closed surface 301 of a left axial iron core 3, a right axial control winding 9 is arranged on a right radial iron core 2 and close to a right closed surface 401 of a right axial iron core 4, the left axial control winding 7 and the right axial control winding 9 are connected in series, and the outer diameter of the left axial control winding 7 and the outer diameter of the right axial control winding 9 are equal to the inner diameter of a ring of the left axial iron core (3) and the inner diameter of a ring of the right.
The static bias magnetic flux 12 generated by the right radial magnetized permanent magnet ring 6 starts from the N pole, passes through the right axial iron core 4, the right axial air gap 13, the rotor iron core 10, the radial air gap 14, the floating teeth C201 and the floating teeth D202 on the right axial iron core 2, and returns to the S pole. The principle of the bias magnetic flux generated on the left axial iron core 1 by the permanent magnet ring 5 is the same.
The radial control magnetic flux generated in the left radial core 1 by the radial control winding 8 passes through the yoke portion of the left radial core 1, and the floating teeth a101 and B102 and the rotor core 10 form a closed circuit. The principle of the radial control magnetic flux generated in the right radial core 2 is the same.
The axial control magnetic flux 15 generated by the left and right axial control windings (7, 9) forms a closed path through the left and right axial cores (3, 4) and the left and right axial air gaps (16, 13).
Suspension principle: static bias magnetic flux 12 interacts with radial control magnetic flux and axial control magnetic flux 15 respectively, so that the superposition of air gap magnetic fields on the same side with the radial eccentric direction of the rotor is weakened, the superposition of air gap magnetic fields in the opposite direction is strengthened, force opposite to the offset direction of the rotor is generated on the rotor, and the rotor is pulled back to a radial balance position.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (5)
1. A radial non-coupling three-degree-of-freedom direct-current hybrid magnetic bearing comprises a radial stator, an axial stator and a rotor positioned in an inner ring of the stator, and is characterized in that,
the radial stator comprises a left radial iron core and a right radial iron core, and the rotor comprises a rotor iron core and a rotating shaft; the left radial iron core is uniformly provided with two suspension teeth along the inner circumference and at the positions symmetrical to the directions of the + x axis and the-x axis; two suspension teeth are uniformly distributed at the positions of the right radial iron core along the inner circumference and symmetrical to the directions of the + y axis and the-y axis; the four suspension teeth are all of a zigzag structure, one end face, close to the rotor core, of each suspension tooth is matched with the circumferential face of the rotor core, the suspension teeth are the same as the rotor core in axial width and are opposite to the rotor core in position, and radial air gaps with the same air gap length are formed between the suspension teeth and the rotor core; centralized radial control windings are wound on the suspension teeth; the outer sides of the left radial iron core and the right radial iron core are respectively provided with a left radial magnetized permanent magnet ring and a right radial magnetized permanent magnet ring;
the axial stator comprises a left axial iron core and a right axial iron core, the inner diameters of the left and right axial iron cores are the same as the outer diameters of the left and right radial magnetized permanent magnetic rings, and the left and right radial magnetized permanent magnetic rings are respectively sleeved with the left and right axial iron cores; and a pair of axial control windings which are connected in series with each other are arranged on the outer sides of the left radial iron core and the right radial iron core and close to the inner ring walls of the left axial iron core and the right axial iron core, and the rotating shaft penetrates through the rotor iron core, the left axial iron core, the right axial iron core, the left radial iron core and the right radial iron core.
2. The radial uncoupled three-degree-of-freedom direct-current hybrid magnetic bearing according to claim 1, wherein the left and right axial cores are disposed opposite to each other, and have sealing surfaces disposed on opposite sides thereof, the sealing surfaces on the left and right axial cores each extend inward with the center as a center of a circle to form a cylindrical ring, an inner diameter of the cylindrical ring is slightly larger than an outer diameter of the rotating shaft and extends to a position close to the rotor core, and left and right axial air gaps are respectively formed between the cylindrical ring and the left and right sides of the rotor core.
3. The radial uncoupled three-degree-of-freedom direct-current hybrid magnetic bearing of claim 2, wherein the left axial air gap and the right axial air gap are the same width.
4. The radial uncoupled three-degree-of-freedom direct-current hybrid magnetic bearing according to any one of claims 1 to 3, wherein the left and right radial cores, the left and right axial cores and the rotor core are made of a magnetically conductive material.
5. The radial uncoupled three-degree-of-freedom direct-current hybrid magnetic bearing according to any one of claims 1 to 3, wherein the left and right radially magnetized permanent magnet rings are made of rare earth permanent magnet material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010055294.3A CN111173838B (en) | 2020-01-17 | 2020-01-17 | Radial uncoupled three-degree-of-freedom direct current hybrid magnetic bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010055294.3A CN111173838B (en) | 2020-01-17 | 2020-01-17 | Radial uncoupled three-degree-of-freedom direct current hybrid magnetic bearing |
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| CN111173838A true CN111173838A (en) | 2020-05-19 |
| CN111173838B CN111173838B (en) | 2023-05-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065854A (en) * | 2020-09-17 | 2020-12-11 | 淮阴工学院 | Combined three-freedom hybrid magnetic bearing with novel structure |
| CN116658520A (en) * | 2023-05-05 | 2023-08-29 | 淮阴工学院 | Outer rotor radial six-pole three-degree-of-freedom alternating current-direct current hybrid magnetic bearing and parameter design method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065854A (en) * | 2020-09-17 | 2020-12-11 | 淮阴工学院 | Combined three-freedom hybrid magnetic bearing with novel structure |
| CN116658520A (en) * | 2023-05-05 | 2023-08-29 | 淮阴工学院 | Outer rotor radial six-pole three-degree-of-freedom alternating current-direct current hybrid magnetic bearing and parameter design method |
| CN116658520B (en) * | 2023-05-05 | 2024-06-11 | 淮阴工学院 | Outer rotor radial six-pole three-degree-of-freedom alternating current-direct current hybrid magnetic bearing and parameter design method |
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Application publication date: 20200519 Assignee: Shanghai Yanqiao Information Technology Co.,Ltd. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2023980047724 Denomination of invention: Radial uncoupled three degree of freedom DC hybrid magnetic bearing Granted publication date: 20230526 License type: Common License Record date: 20231121 |
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