CN210978221U - Magnetic bearing for motor - Google Patents
Magnetic bearing for motor Download PDFInfo
- Publication number
- CN210978221U CN210978221U CN201922082967.XU CN201922082967U CN210978221U CN 210978221 U CN210978221 U CN 210978221U CN 201922082967 U CN201922082967 U CN 201922082967U CN 210978221 U CN210978221 U CN 210978221U
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- Prior art keywords
- stator
- axial
- radial
- magnetic
- permanent magnet
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- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 8
- 238000010030 laminating Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 13
- 239000000725 suspension Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Abstract
The utility model discloses a magnetic bearing for a motor, which comprises a rotating shaft, a permanent magnet, a rotor structure and a stator assembly, wherein the stator assembly comprises a radial stator assembly and an axis stator assembly; the rotor structure is arranged on the rotating shaft and is connected with the rotating shaft in a nested manner; the radial stator component consists of a radial stator and a radial control coil; the axial stator component consists of an axial stator and an axial control coil, and a positioning aluminum ring is arranged in the axial stator, the utility model discloses utilize a radial magnetizing annular permanent magnet to generate the bias magnetic field of axial and radial air gaps, eliminate the magnetic polarity change in the radial and axial air gaps when the rotor rotates, reduce the hysteresis loss of the rotor when the rotor rotates at high speed; meanwhile, the axial stator is arranged to be step-shaped, so that the axial stator is convenient to position and assemble with the excircle of the magnetic bearing; the overall structure of the magnetic shaft has small axial size, thereby shortening the span of a main shaft of the motor and increasing the torque and the output power of the motor.
Description
Technical Field
The utility model relates to a magnetic bearing especially relates to a magnetic bearing for motor, belongs to motor design technical field.
Background
Magnetic suspension bearings are various in types and can be divided into a first shaft, a second shaft and up to a fifth shaft according to the controlled degree of freedom; and may be classified into an attractive force type and a repulsive force type according to the type of magnetic field force used. However, at present, Magnetic bearings are generally classified into three types, namely, Active Magnetic Bearing (AMB), Passive Magnetic Bearing (PMB), and Hybrid Magnetic Bearing (HMB). The AMB utilizes an electromagnet to generate controllable electromagnetic force to realize the suspension of the rotor; the PMB completely utilizes an uncontrollable permanent magnet or a superconducting material to generate magnetic force; the HMB generates magnetic force by the electromagnet and the permanent magnet together.
The magnetic bearing suspends the rotor in the space by utilizing the action of electromagnetic force, so that no mechanical friction exists between the rotor and the stator, and the magnetic bearing is a low-loss and high-performance bearing. The high-speed rotating speed is realized, and meanwhile, the high-speed rotating device has the advantages of no mechanical wear, low energy consumption, low noise, long service life, no lubrication, no oil pollution and the like, and is more and more widely applied to high-speed equipment. The magnetic bearing with the offset permanent magnet is beneficial to reducing the power consumption of the bearing by adopting the offset permanent magnet to generate the offset magnetic field, in order to ensure the safety of the magnetic bearing system, protective bearings are required to be arranged at two ends of a rotor to prevent the magnetic bearing from being invalid or being suddenly powered off, the rotor and a stator of the magnetic bearing are collided, the arrangement of the protective bearings correspondingly generates the following defects: (1) the axial size of the product is increased; (2) the mode of the magnetic suspension shaft system is reduced, and the difficulty is increased for the control of the magnetic suspension shaft system; and (3) the process for adjusting the gap between the shafting of the magnetic suspension and the protective bearing is relatively complex, so that the assembly time is long.
In order to solve the problems, various motor manufacturers have made a great deal of research on magnetic bearings, and a magnetic bearing is disclosed in Chinese patent (patent No. 201910301319.0, publication No. CN 110017328A, published by 2019.07.16), which combines an axial magnetic bearing and a radial two-degree-of-freedom magnetic bearing into a whole, and uses a permanent magnet as a static bias magnetic field, so that the bias magnetic steel only provides a dynamic magnetic field for balancing load or external interference, thereby greatly reducing the power loss of the system caused by bias magnetic current and saving energy. The rotor part adopts a rotor thrust disc and rotor silicon steel superposition scheme, and axial control magnetic flux and radial control magnetic flux respectively pass through the same path, so that the eddy current loss of the rotor is reduced, and the silicon steel sheet scattering phenomenon is prevented. However, the following problems still exist in the patent: (1) the winding is troublesome, and the processing and the assembly and disassembly are inconvenient; (2) magnetic interference, magnetic flux leakage and magnetic dissipation problems.
Disclosure of Invention
An object of the utility model is to provide a magnetic bearing for motor to solve above-mentioned winding trouble, processing loading and unloading inconvenient, disturb the defect of magnetism, magnetic leakage, magnetic consumption, realize good assembly methods, reduced the assembly trouble.
In order to achieve the purpose, the utility model adopts the technical proposal that:
a magnetic bearing for a motor comprises a rotating shaft, a permanent magnet, a rotor structure and a stator assembly, wherein the stator assembly consists of a radial stator assembly and an axial line stator assembly; the rotor structure is arranged on the rotating shaft and is connected with the rotating shaft in a nested manner; the radial stator assembly is arranged on the outer side of the rotor structure and is coaxial with the rotating shaft; the permanent magnet is arranged on the outer side of the radial stator assembly; the axial stator assembly is arranged on the outer side of the radial stator assembly.
The radial stator component consists of a radial stator and a radial control coil; a tooth groove is formed in the radial stator; the radial control coil is arranged in the tooth slot;
the axial stator component consists of an axial stator and an axial control coil, and a boss is arranged inside the axial stator; the axial control coil is arranged on the boss;
a positioning aluminum ring is arranged in the axial stator, and the positioning aluminum ring is arranged at the end part of the axial stator and is fixed with the axial stator through bolts;
the axial stator is connected with the rotor through bolts;
in a further improvement, the axial control coil is connected in series with the radial control coil;
the radial stator and the axial stator are stator cores formed by laminating silicon steel sheets;
in a further improvement, the permanent magnet is an annular permanent magnet;
the permanent magnet is a permanent magnet made of rare earth material neodymium iron boron;
compared with the prior art, adopt above-mentioned scheme, the beneficial effects of the utility model are that: the utility model adopts the positioning aluminum ring arranged in the axial stator to realize magnetic circuit interference, utilizes a radial magnetized annular permanent magnet to generate a bias magnetic field with axial and radial air gaps, adopts a unipolar structure to make the bias magnetic field flow into (out) of the rotor at the radial and axial air gaps, eliminates the magnetic polarity change in the radial and axial air gaps when the rotor rotates, and reduces the hysteresis loss of the rotor when the rotor rotates at high speed; meanwhile, the axial stator is arranged to be step-shaped, so that the axial stator is convenient to position and assemble with the excircle of the magnetic bearing; the overall structure of the magnetic shaft has small axial size, thereby shortening the span of a main shaft of the motor and increasing the torque and the output power of the motor.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural view of a middle radial stator of the present invention;
wherein, 1, a rotating shaft; 2. an axial stator; 3. positioning an aluminum ring; 4. a radial control coil; 5. a radial stator; 6. a permanent magnet; 7. a rotor structure; 8. An axial control coil;
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The first embodiment,
A magnetic bearing for a motor comprises a rotating shaft 1, a permanent magnet 6, a rotor structure 7 and a stator assembly, wherein the stator assembly consists of a radial stator assembly and an axial line stator assembly; the rotor structure 7 is arranged on the outer side of the rotating shaft 1 and is connected with the rotating shaft 1 in an embedded manner; the radial stator assembly is arranged on the outer side of the rotor structure and is coaxial with the rotating shaft 1; the permanent magnet 6 is arranged on the outer side of the radial stator assembly; the axial stator component is arranged on the outer side of the radial stator component;
the radial stator component consists of a radial stator 5 and a radial control coil 4; a tooth groove (not shown in the figure) is arranged inside the radial stator 5; the radial control coil 4 is arranged in the tooth slot;
preferably, the radial stator is a stator formed by laminating silicon steel sheets; the radial stator is designed into an eight-pole structure, as shown in FIG. 2; eight tooth grooves of the radial stator are symmetrically arranged;
therefore, the octopolar tooth groove structure is adopted, the sensor in the motor is mainly considered, a transmission line of the sensor can conveniently pass through the tooth groove, a line channel does not need to be specially arranged, the size of the whole bearing is reduced, and the machining procedures are also reduced.
The axial stator component consists of an axial stator 2 and an axial control coil 8, and a boss (not marked in the figure) is arranged inside the axial stator 2; the axial control coil 8 is arranged on the boss;
in the utility model, the radial control coil is wound in the tooth slot of the radial stator, and the axial coil is directly wound on the boss designed by the axial stator, so that the winding is simple and feasible;
a positioning aluminum ring 3 is arranged in the axial stator 2, and the positioning aluminum ring 3 is arranged at the end part of the axial stator 2 and is fixed with the axial stator 2 through bolts; the positioning aluminum ring is added on the axial structure, so that the permanent magnet and the radial stator can be positioned in the middle of the whole magnetic bearing, and meanwhile, the problems of magnetic disturbance, magnetic leakage and magnetic consumption are avoided because the aluminum is not magnetic conductive; the defects of magnetic interference, magnetic flux leakage and magnetic consumption are overcome;
preferably, the axial stator 2 is a stator formed by laminating silicon steel sheets; the axial stator 2 is arranged step-like;
the axial stator 2 is arranged in a step shape, so that the axial stator is convenient to position and assemble with the excircle of the magnetic bearing; the axial stator 2 is connected with the excircle bolt of the magnetic bearing, so that the assembly and disassembly are convenient, and the whole structure is simple;
the axial stator 2 is connected with the rotor 7 through bolts; the assembly and disassembly are convenient, and the whole structure is simple;
the rotor structure 7 is formed by laminating silicon steel sheets; the shaft shoulder of the rotating shaft 1 is used for positioning and mounting, so that the traditional positioning shaft sleeve arrangement is omitted, and the size of the whole structure is further shortened;
in the present invention, the axial control coil 8 is connected in series with the radial control coil 4;
further, the permanent magnet 6 is an annular permanent magnet; preferably, the permanent magnet is made of rare earth material neodymium iron boron; the permanent magnets are adopted because the magnetic flux density generated by the permanent magnets is equal in the air gaps above and below, left and right, front and back of the rotor structure; specifically, when the rotor is stably suspended in the radial direction and the axial direction, the rotor is positioned in the middle of the suspension under the static magnetic field suction force generated by the permanent magnet, and the unilateral air gap in the radial direction and the axial direction is 0.5 mm;
the utility model has compact integral design, the functional units (the control coil, the axial radial stator and the permanent magnet) almost occupy most of the volume of the magnetic bearing, and the space utilization rate is very high; under the condition that the control coil is not electrified, when the rotor is in a balance position, the offset magnetic fluxes generated by the annular permanent magnet at the axial air gaps are equal, and the equal offset magnetic fluxes are generated at the four radial air gaps, so that the resultant force of the axial magnetic resistance and the radial magnetic resistance applied to the rotor is zero; when the rotor deviates from the balance position, the reluctance force generated by the permanent magnetic bias magnetic field on the rotor cannot enable the rotor to return to the balance position, so an active closed-loop servo control system is needed to control the currents of the axial control coil and the radial control coil, control magnetic flux and bias magnetic flux are generated to be superposed, the magnetic flux of the rotor in one direction is enhanced, the magnetic flux in the other direction is reduced, the force generated in the upper and lower (Y) directions is different, and the rotor returns to the balance position under the action of the upper and lower reluctance forces;
the utility model adopts the positioning aluminum ring arranged in the axial stator to realize magnetic circuit interference, utilizes a radial magnetized annular permanent magnet to generate a bias magnetic field with axial and radial air gaps, adopts a unipolar structure to make the bias magnetic field flow into (out) of the rotor at the radial and axial air gaps, eliminates the magnetic polarity change in the radial and axial air gaps when the rotor rotates, and reduces the hysteresis loss of the rotor when the rotor rotates at high speed; meanwhile, the axial stator is arranged to be step-shaped, so that the axial stator is convenient to position and assemble with the excircle of the magnetic bearing; the overall structure of the magnetic shaft has small axial size, thereby shortening the span of a main shaft of the motor and increasing the torque and the output power of the motor;
in the utility model, the rotor structure, the axial stator and the radial stator all adopt a laminated structure, silicon steel sheets are adopted for laminating, and soft magnetic materials are adopted, so that the eddy current loss is reduced; the axial coil and the radial coil are in the same structure, so that self-decoupling can be performed;
compared with the prior magnetic bearing, the utility model can greatly reduce the size and the volume in structure, can reduce the weight and the power consumption of the system in the system, and simultaneously, the magnetic bearing also has the advantage of realizing the decoupling of radial and axial magnetic fields, thereby completely meeting the requirements of reducing the axial size, the weight and the power consumption of the system and the like of a bearingless motor as much as possible;
the structure and the air gap forming mode of the rest parts of the utility model are basically the same as that of a magnetic bearing (patent number: 201910301319.0, publication number: CN 110017328A, published date: 2019.07.16), so the description is not repeated;
the utility model discloses in, utilize the permanent magnet to replace traditional electro-magnet to provide the following advantage after the bias magnetic flux: (1) the coil current only needs to provide control magnetic flux, so that the ampere turns of the electromagnet are obviously reduced, and the copper consumption of the magnetic bearing is greatly reduced; (2) in the range of the air gap length, the rigidity coefficient of the magnetic levitation force is closer to a constant; (3) only one power amplifier is needed for each degree of freedom, so that the reliability of the system is enhanced, and the cost is reduced;
the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes without creative work from the above conception, which falls within the protection scope of the present invention.
Claims (5)
1. A magnetic bearing for an electric machine, characterized by: the permanent magnet motor comprises a rotating shaft, a permanent magnet, a rotor structure and a stator assembly, wherein the stator assembly consists of a radial stator assembly and an axial stator assembly; the rotor structure is arranged on the rotating shaft and is connected with the rotating shaft in a nested manner; the radial stator assembly is arranged on the outer side of the rotor structure and is coaxial with the rotating shaft; the permanent magnet is arranged on the outer side of the radial stator assembly; the axial stator component is arranged on the outer side of the radial stator component;
the radial stator component consists of a radial stator and a radial control coil; a tooth groove is formed in the radial stator; the radial control coil is arranged in the tooth slot;
the axial stator component consists of an axial stator and an axial control coil, and a boss is arranged inside the axial stator; the axial control coil is arranged on the boss;
a positioning aluminum ring is arranged in the axial stator, and the positioning aluminum ring is arranged at the end part of the axial stator and is fixed with the axial stator through bolts;
the axial stator is connected with the rotor through bolts.
2. A magnetic bearing for an electric machine as claimed in claim 1, wherein: the axial control coil and the radial control coil are connected in series.
3. A magnetic bearing for an electric machine as claimed in claim 1, wherein: the radial stator and the axial stator are stator cores formed by laminating silicon steel sheets.
4. A magnetic bearing for an electric machine as claimed in claim 1, wherein: the permanent magnet is an annular permanent magnet.
5. A magnetic bearing for an electrical machine as claimed in claim 1 or 4, wherein: the permanent magnet is made of rare earth material neodymium iron boron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922082967.XU CN210978221U (en) | 2019-11-28 | 2019-11-28 | Magnetic bearing for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922082967.XU CN210978221U (en) | 2019-11-28 | 2019-11-28 | Magnetic bearing for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210978221U true CN210978221U (en) | 2020-07-10 |
Family
ID=71421324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922082967.XU Expired - Fee Related CN210978221U (en) | 2019-11-28 | 2019-11-28 | Magnetic bearing for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210978221U (en) |
-
2019
- 2019-11-28 CN CN201922082967.XU patent/CN210978221U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200710 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |