CN111022499B - Radial large bearing capacity hybrid magnetic bearing - Google Patents
Radial large bearing capacity hybrid magnetic bearing Download PDFInfo
- Publication number
- CN111022499B CN111022499B CN201911420062.7A CN201911420062A CN111022499B CN 111022499 B CN111022499 B CN 111022499B CN 201911420062 A CN201911420062 A CN 201911420062A CN 111022499 B CN111022499 B CN 111022499B
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- Prior art keywords
- radial
- core
- stator core
- rotor
- axial
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Links
- 238000004804 winding Methods 0.000 claims abstract description 20
- 230000004323 axial length Effects 0.000 claims abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000005389 magnetism Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 15
- 230000003068 static effect Effects 0.000 abstract description 4
- 238000005339 levitation Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 101100127891 Caenorhabditis elegans let-4 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- F16C32/0444—Details of devices to control the actuation of the electromagnets
Abstract
The invention relates to a non-mechanical contact magnetic bearing, and discloses a radial large-bearing-capacity hybrid magnetic bearing which comprises a stator and a rotor positioned at the inner ring of the stator, wherein the stator comprises a left radial stator core, four axial cores with the same size and equidistantly distributed at the circumferential edge, a right radial stator core and a non-magnetic conductive shell. The rotor comprises a left rotor core, an axially magnetized permanent magnet ring, a right rotor core and a rotating shaft. The invention provides static bias magnetic flux by an axially magnetized rotor permanent magnet ring, and radial control magnetic flux generated by energizing a radial control winding adjusts corresponding bias magnetic flux; the radial magnetic pole of the hybrid magnetic bearing with the structure has no winding, the magnetic pole area can be designed to be maximum, the radial bearing capacity is effectively increased, the axial length is reduced, the size is small, the structure is compact, the critical rotation speed is high, and the suspension force density is high.
Description
Technical Field
The invention relates to the technical field of non-mechanical contact magnetic bearings, in particular to an axial winding hybrid magnetic bearing which can be used as a non-contact suspension support of high-speed transmission components such as flywheel systems, machine tool electric spindles, centrifuges and the like.
Background
The magnetic bearing is a novel high-performance bearing which utilizes electromagnetic force between a stator and a rotor to suspend the rotor in a space and enables the stator and the rotor not to have mechanical contact. Currently, magnetic bearings are classified into ac type and dc type according to the type of control current. The alternating-current magnetic bearing adopts a three-phase magnetic bearing driven by a three-phase inverter, so that the volume of the power amplifier and the cost of the magnetic bearing are reduced, but the three-pole structure is asymmetric in space, and the three-phase current sum of the three-phase inverter is required to be zero, so that the maximum levitation force of the levitation force in two radial degrees of freedom is unequal; in addition, the three-pole alternating current magnetic bearing has serious nonlinearity between levitation force, current and displacement, and two radial degrees of freedom are coupled. The direct current magnetic bearing is generally of an octupole or quadrupole structure, and four paths of unipolar or two paths of bipolar direct current power are required for two radial degrees of freedom of the magnetic bearing of the structure, so that the performance is excellent.
The common feature of the existing quadrupole hybrid magnetic bearing structure is that the radial stator magnetic pole winds the control winding to generate radial control magnetic flux, and the radial control magnetic flux passes through the radial working air gap to interact with the corresponding bias magnetic flux to generate radial levitation force. The radial control winding of the hybrid magnetic bearing of the structure occupies radial space, the radial magnetic pole area cannot be maximized, and the windings are protected by the outer shells positioned on two sides, so that the radial bearing capacity is small, the axial length is long, and the critical rotating speed is low.
Disclosure of Invention
The invention aims to: aiming at the problems existing in the prior art, the invention provides the radial large-bearing-capacity hybrid magnetic bearing, radial magnetic poles have no windings, the magnetic pole area can be designed to be maximum, the radial bearing capacity is effectively increased, the axial length is reduced, the volume is small, the structure is compact, the critical rotation speed is high, and the levitation force density is high.
The technical scheme is as follows: the invention provides a radial large-bearing-capacity hybrid magnetic bearing, which comprises a stator and a rotor positioned at the inner ring of the stator, wherein the stator comprises a left radial stator core, 4 axial cores, a right radial stator core and a non-magnetic conductive shell, wherein the left radial stator cores, the 4 axial cores, the right radial stator cores and the non-magnetic conductive shell are sequentially arranged from left to right, and the axial cores, the right radial stator cores and the non-magnetic conductive shell are distributed at the periphery of the stator in equal intervals; the left radial stator core and the right radial stator core are uniformly divided into four blocks along the circumference by 4 magnetism isolating aluminum blocks respectively; each axial iron core is positioned between two magnetic isolation aluminum blocks which are radially adjacent on the left side and two magnetic isolation aluminum blocks which are radially adjacent on the right side, and a centralized radial control winding is wound on each axial iron core; the non-magnetic conductive shell is arranged on the outer side of the left radial stator core and the outer side of the right radial stator core;
the rotor comprises a left rotor core, an axially magnetized permanent magnet ring, a right rotor core and a rotating shaft which are sequentially arranged from left to right; the left rotor core and the right rotor core are respectively opposite to the left radial stator core and the right radial stator core, the rotor core parts with the same width are respectively provided with a left convex suction disc and a right convex suction disc, the left suction disc and the right suction disc respectively form a left radial air gap and a right radial air gap with the left radial stator core and the right radial stator core, and the rotating shaft penetrates through the left rotor core, the right rotor core and the axially magnetized permanent magnet ring.
Further, the radial control winding is used for radial suspension control, and the opposite radial two-pole windings are reversely connected in series or in parallel.
Further, the left and right radial stator cores, the axial core, and the left and right rotor cores are all made of magnetically conductive materials.
Further, the axial magnetized permanent magnet ring is made of rare earth permanent magnet materials.
Further, the left suction disc and the right suction disc are equal to the left radial stator core and the right radial stator core in axial length.
The beneficial effects are that:
1. the magnetic pole area of the radial large-bearing-capacity hybrid magnetic bearing can be designed to be maximum, so that the radial bearing capacity is effectively increased, the axial length is reduced, the size is small, the structure is compact, the critical rotating speed is high, and the suspension force density is high.
2. The stator of the invention adopts 4 axial iron cores, and the four axial iron cores generate a direct-current hybrid magnetic bearing.
Drawings
FIG. 1 is a schematic diagram of a radial high-bearing-capacity hybrid magnetic bearing of the present invention;
FIG. 2 is a diagram of the levitated magnetic flux of the radial high-capacity hybrid magnetic bearing of the present invention;
fig. 3 is a left side view of the radial large bearing capacity hybrid magnetic bearing axial core of the present invention.
1-left radial stator core, 2-axial core, 3-right radial stator core, 4-non-magnetic conductive shell, 5-magnetism isolating aluminum block, 6-radial control winding, 7-left rotor core, 8-right rotor core, 9-axial magnetized permanent magnet ring, 10-rotating shaft, 11-left suction disc, 12-right suction disc, 13-left radial air gap, 14-right radial air gap, 15-radial suspension control magnetic flux and 16-static bias magnetic flux.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally formed, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention relates to the technical field of non-mechanical contact magnetic bearings, and discloses a radial large-bearing-capacity hybrid magnetic bearing which comprises a stator and a rotor positioned in the inner ring of the stator, wherein the radial magnetic pole area cannot be maximized because a radial control winding of the traditional hybrid magnetic bearing occupies radial space, and the radial bearing capacity is small, the axial length is long and the critical rotation speed is low because a shell positioned at two sides is needed to protect the winding.
The stator comprises a left radial stator core 1, 4 axial cores 2, a right radial stator core 3 and a non-magnetic conductive shell 4 which are arranged in sequence from left to right, wherein the axial cores 2, the right radial stator cores 3 and the non-magnetic conductive shell 4 are distributed on the periphery of the stator in equal distance. The left radial stator core 1 and the right radial stator core 3 are respectively and uniformly divided into a plurality of blocks along the circumference by the magnetism isolating aluminum blocks 5 corresponding to the axial cores 2, and in the embodiment, the number of the axial cores 2 is 4, then the left radial stator core 3 is uniformly divided into 4 blocks along the circumference by the 4 magnetism isolating aluminum blocks 5, the right radial stator core 3 is uniformly divided into 4 blocks along the circumference by the 4 magnetism isolating aluminum blocks 5, the left radial stator core 3 is divided into 4 blocks, the radian of each block is the same as that of each axial core 2, and the divided 4 blocks are positioned in a one-to-one correspondence with each axial core 2.
Each axial core 2 is located between two radially adjacent magnetic shielding aluminum blocks 5 on the left side and two radially adjacent magnetic shielding aluminum blocks 5 on the right side, see fig. 1, that is, each axial core 2 is located between two adjacent magnetic shielding aluminum blocks 5 of the left radial stator core 1 and two adjacent magnetic shielding aluminum blocks 5 of the right radial stator core 3.
A centralized radial control winding 6 is wound on each axial core 2. The non-magnetic conductive housing 4 is arranged outside the left and right radial stator cores.
The rotor comprises a left rotor core 7, an axially magnetized permanent magnet ring 9, a right rotor core 8 and a rotating shaft 10 which are sequentially arranged from left to right. The left rotor core 7 is opposite to the left radial stator core 1 in position and is provided with a convex left suction disc 11, the right rotor core 8 is opposite to the right radial stator core 3 in position and is provided with a convex right suction disc 12, namely, referring to fig. 1, the left radial stator core 1 and the right radial stator core 3 are designed in a hollow ring, the left rotor core 7 is opposite to the left radial stator core 1 in position and is positioned in the ring of the left radial stator core 1, and the axial length of the left suction disc 11 arranged on the left rotor core 7 is the same as the axial length of the left radial stator core 1. The right rotor core 8 is located opposite to the right radial stator core 3, and is located in the annular ring of the right radial stator core 3, and the axial length of the right suction disk 12 provided on the right rotor core 8 is the same as the axial length of the right radial stator core 3. The left suction disc 11 forms a left radial air gap 13 with the annular inner wall of the left radial stator core 1, and the right suction disc 12 forms a right radial air gap 14 with the annular inner wall of the right radial stator core 3.
The rotating shaft 10 penetrates through the left rotor core 7, the right rotor core 8 and the axially magnetized permanent magnet ring 9 to play a supporting role.
The radial control winding 6 is used for radial suspension control, and the opposite radial two-pole windings are reversely connected in series or in parallel.
The left radial stator core 1, the right radial stator core 3, the axial core 2, the left rotor core 7, and the right rotor core 8 are made of a magnetically conductive material. The axial magnetized permanent magnet ring 9 is made of rare earth permanent magnet material.
In the present embodiment, four-pole hybrid magnetic bearings are formed by using 4 axial cores 2, and the hybrid magnetic bearings are direct-current magnetic bearings.
The axially magnetized permanent magnet ring 9 provides a static bias magnetic flux 16, and the magnetic circuit of the static bias magnetic flux 16 is: the magnetic flux starts from the N pole of the axial magnetized permanent magnet ring 9 and returns to the S pole of the axial magnetized permanent magnet ring 9 through the left suction disc 11, the left radial air gap 13, the left radial stator core 1, the top axial core 2, the right radial stator core 3, the right radial air gap 14 and the right suction disc 12.
Let 4 axial cores 2 be seen from the left side of fig. 1, see fig. 3, and respectively labeled as axial core 2d, axial core 2e, axial core 2f, and axial core 2g.
The radial levitation control magnetic flux 15 generated by energizing the radial control winding 6 wound on the top axial core 2d has the magnetic circuit: the left radial stator core 1, the left radial air gap 13, the left suction disc 11, the left radial stator core 1, the axial core 2g, the right radial stator core 3, the right radial air gap 14, the right suction disc 12, the right radial stator core 3, and the axial core 2d form a closed path.
Suspension principle: the radial direction is interacted by the static bias magnetic flux 16 and the radial suspension control magnetic flux 15, so that the air gap field superposition on the same side as the radial eccentric direction of the rotor is weakened, the air gap field superposition in the opposite direction is strengthened, and a force opposite to the rotor offset direction is generated on the rotor to pull the rotor back to the radial balance position.
The foregoing embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (3)
1. A radial large-bearing-capacity hybrid magnetic bearing comprises a stator and a rotor positioned in an inner ring of the stator, and is characterized in that,
the stator comprises a left radial stator core, 4 axial cores, a right radial stator core and a non-magnetic conductive shell, wherein the left radial stator core, the 4 axial cores, the right radial stator cores and the non-magnetic conductive shell are sequentially arranged from left to right, and the axial cores and the right radial stator cores are distributed on the periphery of the stator in equal distance and have the same size; the left radial stator core and the right radial stator core are uniformly divided into four blocks along the circumference by 4 magnetism isolating aluminum blocks respectively; each axial iron core is positioned between two magnetic isolation aluminum blocks which are radially adjacent on the left side and two magnetic isolation aluminum blocks which are radially adjacent on the right side, and a centralized radial control winding is wound on each axial iron core; the non-magnetic conductive shell is arranged on the outer side of the left radial stator core and the outer side of the right radial stator core;
the rotor comprises a left rotor core, an axially magnetized permanent magnet ring, a right rotor core and a rotating shaft which are sequentially arranged from left to right; the left rotor core and the right rotor core are respectively opposite to the left radial stator core and the right radial stator core, the rotor core parts with the same width are respectively provided with a left convex suction disc and a right convex suction disc, the left suction disc and the right suction disc respectively form a left radial air gap and a right radial air gap with the left radial stator core and the right radial stator core, and the rotating shaft penetrates through the left rotor core, the right rotor core and the axially magnetized permanent magnet ring;
the radial control winding is used for radial suspension control, and the opposite radial two-pole windings are reversely connected in series or in parallel;
the left suction disc and the right suction disc are equal to the left radial stator core in axial length.
2. The radial high capacity hybrid magnetic bearing of claim 1, wherein said left and right radial stator cores, axial core, and left and right rotor cores are each made of magnetically permeable material.
3. The radial high-bearing hybrid magnetic bearing of claim 1, wherein the axially magnetized permanent magnet ring is made of rare earth permanent magnet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911420062.7A CN111022499B (en) | 2019-12-31 | 2019-12-31 | Radial large bearing capacity hybrid magnetic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911420062.7A CN111022499B (en) | 2019-12-31 | 2019-12-31 | Radial large bearing capacity hybrid magnetic bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111022499A CN111022499A (en) | 2020-04-17 |
| CN111022499B true CN111022499B (en) | 2023-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911420062.7A Active CN111022499B (en) | 2019-12-31 | 2019-12-31 | Radial large bearing capacity hybrid magnetic bearing |
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| CN (1) | CN111022499B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065854B (en) * | 2020-09-17 | 2023-06-30 | 淮阴工学院 | Combined three-degree-of-freedom hybrid magnetic bearing with novel structure |
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2019
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Application publication date: 20200417 Assignee: Shanghai Yanqiao Information Technology Co.,Ltd. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2023980047724 Denomination of invention: Radial high bearing capacity hybrid magnetic bearing Granted publication date: 20230929 License type: Common License Record date: 20231121 |