CN108547868B - Semi-freedom degree radial magnetizing hybrid axial magnetic bearing - Google Patents
Semi-freedom degree radial magnetizing hybrid axial magnetic bearing Download PDFInfo
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- CN108547868B CN108547868B CN201810324656.7A CN201810324656A CN108547868B CN 108547868 B CN108547868 B CN 108547868B CN 201810324656 A CN201810324656 A CN 201810324656A CN 108547868 B CN108547868 B CN 108547868B
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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
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
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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
- F16C32/0442—Active magnetic bearings with devices affected by abnormal, undesired or non-standard conditions such as shock-load, power outage, start-up or touchdown
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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
- F16C32/0476—Active magnetic bearings for rotary movement with active support of one degree of freedom, e.g. axial 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 mixed axial magnetic bearing with semi-freedom degree and radial magnetization, which comprises a rotor and a stator component arranged on one side of the rotor component, wherein the rotor component consists of a rotor core, the stator component comprises an inner axial magnetic pole, an annular permanent magnet and an outer axial magnetic pole with a groove, an axial control winding is arranged in the groove of the outer axial magnetic pole, the outer axial magnetic pole comprises an annular inner stator A, an upper stator disc B, an annular outer stator C and a lower stator disc D, an axial air gap is formed between the lower surface of the inner axial magnetic pole, the annular permanent magnet and the inner stator A of the outer axial magnetic pole and the upper surface of the rotor core, and the mixed axial magnetic bearing also comprises a displacement sensor which is connected with the axial control winding through a controller and a power amplifier. The hybrid axial magnetic bearing is simple in structure, low in mounting process difficulty, capable of achieving active control of axial displacement of the single side of the rotating shaft and suitable for industrial popularization and use.
Description
Technical Field
The invention relates to a semi-freedom degree radial magnetizing hybrid axial magnetic bearing, belonging to a hybrid magnetic bearing in magnetic bearings.
Background
The magnetic bearing technology utilizes the magnetic force between the stator and the rotor to suspend the rotor in the space, thereby avoiding the mechanical contact between the stator and the rotor, and being a novel bearing with high performance. Because the stator and the rotor do not need mechanical contact, the bearing rotor can bear high rotating speed, has the advantages of long service life, low energy consumption, no lubrication, no pollution and the like, and has the advantage of no substitution in special application occasions such as high speed, vacuum, ultra-clean and the like.
The hybrid magnetic bearing utilizes the permanent magnetic material to generate a bias magnetic field, thereby reducing the power loss generated by the bias current in the active magnetic bearing. However, the existing hybrid axial magnetic bearings have the problems of difficult installation, inconvenient disassembly and the like, and the development and application of the hybrid axial magnetic bearings are limited.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a half-degree-of-freedom radial magnetizing hybrid axial magnetic bearing.
The purpose of the invention is realized by the following technical scheme: a semi-freedom radial magnetizing hybrid axial magnetic bearing comprises a rotor and a stator component arranged on one side of a rotor component, the rotor component is composed of a rotor core, the stator component comprises an annular permanent magnet, an annular inner axial magnetic pole and an annular outer axial magnetic pole with a groove, an axial control winding is arranged in a groove of the outer axial magnetic pole, the outer axial magnetic pole comprises an annular inner stator A, an upper stator disc B, an annular outer stator C and a lower stator disc D, an axial air gap is formed between the lower surface of the inner stator A of the inner axial magnetic pole, the annular permanent magnet and the outer axial magnetic pole and the upper surface of the rotor iron core, the hybrid axial magnetic bearing further comprises a displacement sensor for detecting the displacement of the rotor from its neutral position, and the displacement sensor is connected with the axial control winding through a controller and a power amplifier.
Preferably, the rotor core is annular in shape.
Preferably, the annular permanent magnet is attached to the excircle of the inner axial magnetic pole, the inner stator a of the outer axial magnetic pole is sleeved on the excircle of the annular permanent magnet, the upper stator disc B is installed at the upper end of the excircle surface of the inner stator a, the outer stator C is sleeved on the excircle surface of the upper stator disc B, and the lower stator disc D is installed at the lower end of the inner circle of the outer stator C and is flush with the bottom surface.
Preferably, the axial length of the outer stator C of said outer axial pole is equal to the sum of the axial length of the rotor core plus the axial length of the axial air gap plus the axial length of the inner axial pole.
Preferably, the axial lengths of the inner axial magnetic pole, the annular permanent magnet and the inner stator a of the outer axial magnetic pole are equal.
Preferably, the annular permanent magnet is magnetized in a radial direction, and the axial length of the annular permanent magnet is equal to that of the inner axial magnetic pole.
Preferably, the bias magnetic flux generated by the annular permanent magnet sequentially passes through the inner axial magnetic pole, the axial air gap, the rotor core, the axial air gap and the outer axial magnetic pole to form a loop, and the control magnetic flux generated by the axial control winding sequentially passes through the rotor core, the axial air gap and the outer axial magnetic pole to form a loop.
Preferably, the outer axial magnetic pole, the inner axial magnetic pole and the rotor core are all made of electrician pure iron.
Preferably, the axial control winding is centralized.
The technical scheme of the invention has the advantages that: the hybrid axial magnetic bearing can realize the unilateral tension adjustment of the rotating shaft in the actual use process, realize the active control of unilateral axial displacement, and can be applied to certain occasions only needing to realize the unilateral axial displacement control, such as flywheels. Compared with the traditional single-degree-of-freedom axial magnetic bearing, the hybrid axial magnetic bearing has the characteristics of small volume, simple structure, simplified control, convenient installation and the like. If the axial displacement of the rotating shaft is actively controlled, the axial suspension of the rotating shaft can be realized only by matching two same half-degree-of-freedom radially magnetized hybrid axial magnetic bearings, and the magnetic suspension system has wide application prospects in various magnetic suspension systems.
Drawings
Fig. 1 is a schematic plan view of a half-degree-of-freedom radial magnetization hybrid axial magnetic bearing according to the present invention.
Fig. 2 is a schematic diagram of a half-degree-of-freedom radial magnetization hybrid axial magnetic bearing according to the present invention.
Detailed Description
Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. The embodiments are merely exemplary for applying the technical solutions of the present invention, and any technical solution formed by replacing or converting the equivalent thereof falls within the scope of the present invention claimed.
The invention discloses a semi-freedom radial magnetizing hybrid axial magnetic bearing, which comprises a rotor and a stator assembly arranged on one side of the rotor assembly as shown in figure 1, wherein the rotor assembly is composed of a rotor iron core 1, the rotor iron core 1 is sleeved on a rotating shaft 10, and in the technical scheme, the rotor iron core 1 is annular. The stator assembly comprises an annular permanent magnet 3, an annular inner axial magnetic pole 2 and an annular outer axial magnetic pole 4 with a groove, wherein an axial control winding 5 is installed in the groove of the outer axial magnetic pole 4, and in the technical scheme, the shape of the inner axial magnetic pole 2 and the shape of the outer axial magnetic pole 4 are both annular.
The hybrid axial magnetic bearing comprises an outer axial magnetic pole 4, an inner axial magnetic pole 2, an annular permanent magnet 3, an axial air gap 6, a displacement sensor and an axial control winding 5, wherein the outer axial magnetic pole 4 comprises an annular inner stator A, an upper stator disc B, an annular outer stator C and a lower stator disc D, an axial air gap 6 is formed between the lower surface of the inner stator A of the inner axial magnetic pole, the lower surface of the inner axial magnetic pole 3 and the upper surface of a rotor core of the outer axial magnetic pole 4, the displacement sensor is used for detecting the displacement of a rotor deviating from the middle position of the rotor, the displacement sensor is connected with the axial control winding 5 through.
Specifically, the annular permanent magnet 3 is attached to the excircle of the inner axial magnetic pole 2, the inner stator a of the outer axial magnetic pole 4 is sleeved on the excircle of the annular permanent magnet, the upper stator disc B is installed at the upper end of the excircle surface of the inner stator a, the outer stator C is sleeved on the excircle surface of the upper stator disc B, and the lower stator disc D is installed at the lower end of the inner circle of the outer stator C and is flush with the bottom surface. As shown in fig. 2, the single arrows in fig. 2 represent the permanent magnet bias flux and the double arrows represent the flux generated by the control winding. The bias magnetic flux generated by the annular permanent magnet 3 sequentially passes through the inner axial magnetic pole 2, the axial air gap 6, the rotor core 1, the axial air gap 6 and the outer axial magnetic pole 4 to form a loop, and the control magnetic flux generated by the axial control winding 5 sequentially passes through the rotor core 1, the axial air gap 6 and the outer axial magnetic pole 4 to form a loop.
The axial length of the outer stator C of the outer axial magnetic pole 4 is equal to the sum of the axial length of the rotor core 1 plus the axial length of the axial air gap 6 plus the axial length of the inner axial magnetic pole 2. The axial lengths of the inner axial magnetic pole 2, the annular permanent magnet 3 and the inner stator A of the outer axial magnetic pole 4 are equal. The annular permanent magnet 3 adopts radial magnetization, and the axial length of the annular permanent magnet 3 is equal to that of the inner axial magnetic pole 2. The outer axial magnetic pole 4, the inner axial magnetic pole 2 and the rotor iron core 1 are all made of electrical pure iron.
The basic working principle is as follows: in an axial air gap of a semi-freedom-degree radial magnetizing hybrid axial magnetic bearing, magnetic flux generated by a ring-shaped permanent magnet generates unilateral attraction force, if the unilateral attraction force needs to be increased, the magnitude of control current needs to be increased, and the control magnetic flux generated by the control current and bias magnetic flux are in the same direction. If the rotor is subjected to a disturbing force opposite to the attraction force, the rotor can deflect and move reversely, so that the axial air gap is enlarged, and the magnetic flux is reduced. The displacement sensor detects the displacement of the rotor, the controller converts the displacement signal into a control signal, the power amplifier converts the control signal into a control current, and the control current changes the magnetic flux of the control magnetic field, so that the magnetic flux in the air gap of the rotor is increased, the magnetic field tension in the air gap is increased, and the rotor is pulled back to the original position.
The half-freedom-degree radial magnetizing hybrid axial magnetic bearing can realize the unilateral tension adjustment of the rotating shaft and the active control of unilateral axial displacement, and can be applied to certain occasions only needing to realize the axial unilateral displacement control, such as a flywheel. Compared with the traditional axial magnetic bearing with single degree of freedom, the magnetic bearing has the characteristics of small volume, simple structure, simplified control and convenient installation. If the axial displacement of the rotating shaft is actively controlled, the axial suspension of the rotating shaft can be realized only by matching two same half-degree-of-freedom radially magnetized hybrid axial magnetic bearings, and the magnetic suspension system has wide application prospects in various magnetic suspension systems.
The hybrid axial magnetic bearing has the advantages of simple structure and low difficulty in installation process, can realize active control of axial displacement of one side of the rotating shaft, and is suitable for industrial popularization and use.
The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.
Claims (8)
1. A semi-freedom radial magnetizing hybrid axial magnetic bearing is characterized in that: the hybrid axial magnetic bearing comprises a rotor and a stator assembly arranged on one side of the rotor assembly, wherein the rotor assembly is composed of a rotor core (1), the rotor core (1) is sleeved on a rotating shaft (10), the stator assembly comprises an annular permanent magnet (3), an annular inner axial magnetic pole (2) and an annular outer axial magnetic pole (4) with a groove, an axial control winding (5) is arranged in the groove of the outer axial magnetic pole (4), the outer axial magnetic pole (4) comprises an annular inner stator (A), an upper stator disc (B), an annular outer stator (C) and a lower stator disc (D), an axial air gap (6) is formed between the lower surface of the inner stator (A) of the inner axial magnetic pole (2), the annular permanent magnet (3) and the outer axial magnetic pole (4) and the upper surface of the rotor core, and the hybrid axial magnetic bearing further comprises a displacement sensor for detecting the displacement of the rotor from the middle position, the displacement sensor is connected with the axial control winding (5) through a controller and a power amplifier; a radial air gap (7) is formed between the inner circular surface of a lower stator disc D of an axial magnetic pole and the outer circular surface of a rotor core, the annular permanent magnet (3) is attached to the outer circle of the inner axial magnetic pole (2), an inner stator (A) of an outer axial magnetic pole (4) is sleeved on the outer circle of the annular permanent magnet, an upper stator disc (B) is installed at the upper end of the outer circular surface of the inner stator (A), an outer stator (C) is sleeved on the outer circular surface of the upper stator disc (B), and the lower stator disc (D) is installed at the lower end of the inner circle of the outer stator (C) and is flush with the bottom.
2. The half-degree-of-freedom radially-magnetized hybrid axial magnetic bearing of claim 1, wherein: the rotor iron core (1) is annular.
3. The half-degree-of-freedom radially-magnetized hybrid axial magnetic bearing of claim 1, wherein: the axial length of an outer stator (C) of the outer axial magnetic pole (4) is equal to the sum of the axial length of the rotor core (1), the axial length of the axial air gap (6) and the axial length of the inner axial magnetic pole (2).
4. The half-degree-of-freedom radially-magnetized hybrid axial magnetic bearing of claim 1, wherein: the axial lengths of the inner stator (A) of the inner axial magnetic pole (2), the annular permanent magnet (3) and the outer axial magnetic pole (4) are equal.
5. The half-degree-of-freedom radially-magnetized hybrid axial magnetic bearing of claim 1, wherein: the annular permanent magnet (3) adopts radial magnetization, and the axial length of the annular permanent magnet (3) is equal to that of the inner axial magnetic pole (2).
6. The half-degree-of-freedom radially-magnetized hybrid axial magnetic bearing of claim 1, wherein: the bias magnetic flux generated by the annular permanent magnet (3) sequentially passes through the inner axial magnetic pole (2), the axial air gap (6), the rotor core (1), the axial air gap (6) and the outer axial magnetic pole (4) to form a loop, and the control magnetic flux generated by the axial control winding (5) sequentially passes through the rotor core (1), the axial air gap (6) and the outer axial magnetic pole (4) to form the loop.
7. The half-degree-of-freedom radially-magnetized hybrid axial magnetic bearing of claim 1, wherein: the rotor iron core (1), the inner axial magnetic pole (2) and the outer axial magnetic pole (4) are all made of electrician pure iron.
8. The half-degree-of-freedom radially-magnetized hybrid axial magnetic bearing of claim 1, wherein: the axial control winding (5) is centralized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810324656.7A CN108547868B (en) | 2018-04-12 | 2018-04-12 | Semi-freedom degree radial magnetizing hybrid axial magnetic bearing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810324656.7A CN108547868B (en) | 2018-04-12 | 2018-04-12 | Semi-freedom degree radial magnetizing hybrid axial magnetic bearing |
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| CN108547868A CN108547868A (en) | 2018-09-18 |
| CN108547868B true CN108547868B (en) | 2020-02-07 |
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| CN201810324656.7A Active CN108547868B (en) | 2018-04-12 | 2018-04-12 | Semi-freedom degree radial magnetizing hybrid axial magnetic bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113048148B (en) * | 2019-12-28 | 2023-09-01 | 坎德拉(深圳)新能源科技有限公司 | Magnetic bearing and rotating mechanism using same |
| CN111102291A (en) * | 2019-12-31 | 2020-05-05 | 珠海格力电器股份有限公司 | Magnetic suspension bearing, compressor and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100458199C (en) * | 2007-07-13 | 2009-02-04 | 南京航空航天大学 | Permanent magnet biased axial magnetic suspension bearing |
| CN101832335B (en) * | 2010-05-25 | 2012-06-20 | 南京化工职业技术学院 | Permanent magnet biased axial-radial magnetic bearing |
| CN101893038A (en) * | 2010-08-04 | 2010-11-24 | 南京化工职业技术学院 | Permanent magnet biased axial magnetic bearing |
| CN202520777U (en) * | 2012-02-28 | 2012-11-07 | 南京化工职业技术学院 | Permanent magnet biased axial magnetic bearing |
| CN103216528A (en) * | 2013-04-22 | 2013-07-24 | 南京航空航天大学 | One-side hybrid axial magnetic bearing |
| CN104154119A (en) * | 2014-07-16 | 2014-11-19 | 南京化工职业技术学院 | Permanent magnet biased axial-radial magnetic bearing |
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Effective date of registration: 20211224 Address after: 213163 No. 95, Zhenbei Road, Tong'an Town, high tech Zone, Suzhou, Jiangsu Patentee after: Suzhou LIANLI Precision Manufacturing Co.,Ltd. Address before: 210003, 66 new model street, Gulou District, Jiangsu, Nanjing Patentee before: NANJING University OF POSTS AND TELECOMMUNICATIONS |
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