CN117570111B - Three-degree-of-freedom combined pure electromagnetic bearing for air compressor, air compressor and motor thereof - Google Patents
Three-degree-of-freedom combined pure electromagnetic bearing for air compressor, air compressor and motor thereof Download PDFInfo
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- CN117570111B CN117570111B CN202410079177.9A CN202410079177A CN117570111B CN 117570111 B CN117570111 B CN 117570111B CN 202410079177 A CN202410079177 A CN 202410079177A CN 117570111 B CN117570111 B CN 117570111B
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- 238000004804 winding Methods 0.000 claims abstract description 154
- 238000013461 design Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000725 suspension Substances 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 229920006335 epoxy glue Polymers 0.000 description 3
- 238000013519 translation Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/058—Bearings magnetic; electromagnetic
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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
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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
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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
- F16C32/0468—Details of the magnetic circuit of moving parts of the magnetic circuit, e.g. of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
Abstract
The application discloses a three-degree-of-freedom combined pure electromagnetic bearing for an air compressor, the air compressor and a motor thereof, and relates to the technical field of magnetic suspension bearings; the three-degree-of-freedom combined pure electromagnetic bearing for the air compressor comprises a rotor system, a left magnetic bearing stator system and a right axial magnetic bearing stator system, wherein the rotor system comprises a rotor; the left magnetic bearing stator system comprises a left stator core, a +x-axis left axial winding, a +y-axis left axial winding, a-y-axis left axial winding, a +x-axis left radial winding, a-x-axis left radial winding, a +y-axis left radial winding and a-y-axis left radial winding; the right axial magnetic bearing stator system includes a right axial stator core and a right axial winding. According to the three-degree-of-freedom combined pure-electromagnetic bearing for the air compressor, the left axial magnetic bearing and the radial magnetic bearing are integrated into a whole through the common stator core, so that the functional integrated design of the radial magnetic bearing is realized, and the utilization rate of materials and structural space is improved.
Description
Technical Field
The application relates to the technical field of magnetic suspension bearings, in particular to a three-degree-of-freedom combined pure electromagnetic bearing for an air compressor. And also relates to an air compressor and a motor thereof.
Background
Compared with the traditional medium-low speed motor, the high-speed motor has the advantages of high rotating speed, high power density and the like, can be directly connected to a high-speed load, omits a traditional mechanical gear speed increasing device, has obvious energy-saving effect, and is widely applied to high-speed occasions such as a blower, an air compressor, a machine tool spindle and the like, and the market prospect is wide. The main mechanical bearings, oil film bearings, air bearings and magnetic suspension bearings are commonly used for supporting the high-speed motor, wherein the mechanical bearings are limited by contact friction and abrasion and cannot work for a long time; the oil film bearing needs a special oil circulation system, has a complex structure, often has faults such as oil leakage and the like, and influences the normal operation of equipment; compared with the two, the air bearing can realize the non-contact suspension support of the rotor, has low air viscosity, does not need additional air supply equipment and is suitable for supporting a high-speed motor, but has higher environmental requirements and lower bearing rigidity, and cannot bear a large-inertia rotor. Compared with the former three bearings, the magnetic bearing eliminates friction and abrasion, does not need lubrication, can realize on-line active control of rotor vibration, improves the running stability of a system, and is an ideal supporting component for the development of high-speed rotating power machinery in the future.
The magnetic bearing can be divided into an active magnetic bearing and a passive magnetic bearing according to whether the magnetic force is controllable, and compared with the passive magnetic bearing, the active magnetic bearing has the advantages of active vibration control, active vibration suppression and the like, can realize high-precision displacement control of high-speed rotating machinery, and has wider application fields. The active magnetic bearing can be divided into a permanent magnet bias magnetic bearing and a pure magnetic bearing according to the generation mode of bias magnetic flux, wherein the permanent magnet bias magnetic bearing provides a bias magnetic field by using bias current, the control magnetic field is provided by electromagnetism, and stable suspension of the high-speed rotor is realized by forward and reverse superposition of the bias magnetic field and the control magnetic field, but the permanent magnet bias magnetic bearing has magnetic force and magnetic circuit coupling, so that the complexity of a control system is improved, and the control precision of the magnetic bearing is reduced. In contrast, the pure electromagnetic bearing can realize the decoupling of the magnetic force and the magnetic circuit of the magnetic bearing through the structure and the magnetic circuit design, thereby improving the control precision of the magnetic bearing and having wider application range. However, the existing pure electromagnetic bearing has relatively single function, the radial magnetic bearing and the axial magnetic bearing are required to be used in combination to realize the control of five degrees of freedom of translation and deflection of the high-speed rotor, the system structure is complex, and the reliability of the system is reduced.
Disclosure of Invention
The application aims to provide a three-degree-of-freedom combined pure electromagnetic bearing for an air compressor, which integrates a left axial magnetic bearing and a radial magnetic bearing into a whole by sharing a stator core, so that the functional integrated design of the radial magnetic bearing is realized, and the utilization rate of materials and structural space is improved; the technical scheme solves the problems that the existing pure electromagnetic bearing needs to use a radial magnetic bearing and an axial magnetic bearing in combination to produce a complex system structure and low system reliability. The application further aims to provide an air compressor and a motor thereof, wherein the air compressor comprises the three-degree-of-freedom combined pure electromagnetic bearing for the air compressor.
In order to achieve the above object, the present application provides a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor, comprising:
A rotor system comprising a rotor;
The left magnetic bearing stator system comprises a left stator core, a +x-axis left axial winding, a-x-axis left axial winding, a +y-axis left axial winding, a-y-axis left axial winding, a +x-axis left radial winding, a-x-axis left radial winding, a +y-axis left radial winding and a-y-axis left radial winding; the left stator core is positioned on the radial outer side of the left end of the rotor shaft, and the left stator core comprises: the positive and negative directions of the left stator core are orthogonal, and the positive and negative directions of the left stator core are clockwise deflected by 22.5 degrees, and the positive and negative directions of the left stator core are orthogonal, and the positive and negative directions of the positive stator core are clockwise deflected by 22.5 degrees, and are fixed, and the positive and negative directions of the left stator core are respectively wound on the positive and negative directions of the left stator core are respectively fixed: +x-axis left radial winding, -x-axis left radial winding the +y axis left radial winding and the-y axis left radial winding are respectively wound on radial magnetic poles which deflect by 22.5 degrees anticlockwise in the positive and negative directions of the x axis and the y axis of the left stator core in an orthogonal manner and are fixed;
a right axial magnetic bearing stator system comprising a right axial stator core and a right axial winding; the right axial stator core is positioned at the right side of the rotor shaft, and the right axial winding is wound in an annular groove of the right axial stator core and fixed.
In some embodiments, the following: the rotor, the left stator core and the right axial stator core are 1J22 bars with high saturation magnetic density or electrical pure iron DT4C materials.
In some embodiments, the following: the +x-axis left axial winding, -x-axis left axial winding, +y-axis left axial winding and-y-axis left axial winding are solidified on the axial magnetic pole through epoxy resin glue; the method comprises the following steps: the +x-axis left radial winding, -x-axis left radial winding, +y-axis left radial winding and-y-axis left radial winding are cured on the radial magnetic pole through epoxy resin glue; the right axial winding is solidified in the annular groove through epoxy resin glue.
In some embodiments, the right surface of the axial magnetic pole of the left stator core, which deflects 22.5 degrees clockwise in the positive and negative directions orthogonal to the x axis and the y axis, forms an air gap with the left surface of the thrust disc of the rotor, and the size of the air gap is 0.5mm; the inner surface of the radial magnetic pole of the left stator core, which deflects 22.5 degrees anticlockwise in the positive and negative directions in the right and left directions, and the outer surface of the left side of the rotor form an air gap, and the size of the air gap is 0.4mm; the left end surfaces of the inner magnetic pole and the outer magnetic pole of the right axial stator core and the right surface of the thrust disc of the rotor form an air gap, and the size of the air gap is 0.5mm.
In some embodiments, the right surface of the axial pole that is offset by 22.5 ° clockwise in the direction orthogonal to the positive and negative directions of the left stator core x-axis and y-axis is 5mm higher in the axial direction than the right surface of the radial pole that is offset by 22.5 ° counterclockwise in the direction orthogonal to the positive and negative directions of the left stator core x-axis and y-axis.
In some embodiments, the design value of the sum of the total areas of the right surfaces of the axial poles of the left stator core, which are offset by 22.5 ° clockwise in the positive and negative directions, is equal to 1/5 of the sum of the areas of the inner and outer poles of the right axial stator core.
In some embodiments, the following: the +x-axis left axial winding, -x-axis left axial winding, +y-axis left axial winding and-y-axis left axial winding are enameled wires with the wire diameter of 0.95mm, and the turns of the enameled wires are all 250-300 turns; the method comprises the following steps: the +x axis left radial winding, -x axis left radial winding, +y axis left radial winding and-y axis left radial winding are enameled wires with the wire diameter of 0.2mm, and the turns of the enameled wires are 150-200 turns.
In some embodiments, the right axial winding adopts enameled wires with the wire diameter of 0.95mm, and the turns of the enameled wires are 112-134 turns.
The application also provides an air compressor motor, which comprises the three-degree-of-freedom combined pure electromagnetic bearing for the air compressor.
The application also provides an air compressor, which comprises the air compressor motor.
Compared with the background art, the three-degree-of-freedom combined pure electromagnetic bearing for the air compressor provided by the application comprises a rotor system and a stator system, wherein the stator system is divided into a left magnetic bearing stator system and a right axial magnetic bearing stator system. The rotor system includes a rotor. The left magnetic bearing stator system comprises a left stator core, a +x-axis left axial winding, a +y-axis left axial winding, a-y-axis left axial winding, a +x-axis left radial winding, a-x-axis left radial winding, a +y-axis left radial winding and a-y-axis left radial winding; the left stator core is positioned at the radial outer side of the left end of the rotor shaft, the +x-axis left axial winding, -x-axis left axial winding, +y-axis left axial winding and-y-axis left axial winding are respectively wound on axial magnetic poles which deflect by 22.5 degrees clockwise in the positive and negative directions of the x-axis and the y-axis of the left stator core in an orthogonal mode and are fixed, and the +x-axis left radial winding, -x-axis left radial winding, +y-axis left radial winding and-y-axis left radial winding are respectively wound on radial magnetic poles which deflect by 22.5 degrees anticlockwise in the positive and negative directions of the x-axis and the y-axis of the left stator core in an orthogonal mode and are fixed. The right axial magnetic bearing stator system comprises a right axial stator core and a right axial winding; the right axial stator core is positioned on the right side of the rotor shaft, and the right axial winding is wound in an annular groove of the right axial stator core and fixed.
The principle of the scheme is as follows: taking the translation control in the z-axis direction as an example, when the rotor deviates from the balance position along the positive direction of the z-axis, the air gap between the left magnetic bearing stator system and the rotor system is reduced, the air gap between the right magnetic bearing stator system and the rotor system is increased, meanwhile, the currents of positive and negative x-axis axial windings and y-axis axial windings of the left magnetic bearing stator system are reduced, the currents of the axial windings of the right magnetic bearing stator system are increased, and electromagnetic resultant force along the negative direction of the z-axis is generated to adjust the rotor system to return to the balance position; when the rotor system deviates from the balance position along the negative direction of the z axis, the air gap between the left magnetic bearing stator system and the rotor system is increased, the air gap between the right magnetic bearing stator system and the rotor system is reduced, meanwhile, the currents of positive and negative x and y axial windings of the left magnetic bearing stator system are increased, the currents of the axial windings of the right magnetic bearing stator system are reduced, and electromagnetic resultant force along the positive direction of the z axis is generated to adjust the rotor to return to the balance position. Meanwhile, the translational control of the two radial degrees of freedom of the magnetic bearing can be realized by utilizing the positive and negative x-axis radial winding currents and the y-axis radial winding currents of the left magnetic bearing subsystem, and the control mode is similar to the translational control of the z-axis direction.
According to the three-degree-of-freedom combined pure electromagnetic bearing for the air compressor, the left axial magnetic bearing and the radial magnetic bearing are integrated into a whole by sharing the stator core, so that the functional integrated design of the radial magnetic bearing is realized, and the utilization rate of materials and structural space is improved; the technical scheme solves the problems that the existing pure electromagnetic bearing needs to use a radial magnetic bearing and an axial magnetic bearing in combination to produce a complex system structure and low system reliability.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic three-dimensional structure diagram of a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to an embodiment of the application;
fig. 2 is a schematic diagram of a three-dimensional structure of a left magnetic bearing stator system of a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to an embodiment of the application;
Fig. 3 is a schematic diagram of a three-dimensional structure of a stator system of a right axial magnetic bearing of a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to an embodiment of the present application;
Fig. 4 is a schematic three-dimensional structure diagram of a left stator core of a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to an embodiment of the present application;
Fig. 5 is a schematic three-dimensional structure diagram of a right axial stator core of a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to an embodiment of the present application;
fig. 6 is a schematic three-dimensional structure of a rotor of a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to an embodiment of the application.
Wherein:
1. a rotor;
2. a left stator core;
3A, +x axis left axial winding; 3B, -x-axis left axial winding; 3C, +y-axis left axial winding; 3D, -y-axis left axial winding;
4A, +x axis left radial winding; 4B, -x-axis left radial windings; 4C, +y-axis left radial winding; 4D, -y-axis left radial windings;
5. A right axial stator core;
6. right axial winding.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The present application will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present application.
Aiming at the defects in the prior art, the application provides a combined three-degree-of-freedom combined pure-electromagnetic magnetic bearing which is shared by an axial magnetic bearing and a radial magnetic bearing iron core and is integrated in function, and the combined three-degree-of-freedom combined pure-electromagnetic bearing can be used for radial/axial three-degree-of-freedom translational suspension support of a magnetic suspension high-speed rotating power machine.
Referring to fig. 1 to 6, fig. 1 is a schematic three-dimensional structure of a three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor provided by the embodiment of the application, fig. 2 is a schematic three-dimensional structure of a left magnetic bearing stator system of the three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor provided by the embodiment of the application, fig. 3 is a schematic three-dimensional structure of a right axial magnetic bearing stator system of the three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor provided by the embodiment of the application, fig. 4 is a schematic three-dimensional structure of a left stator core of the three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor provided by the embodiment of the application, fig. 5 is a schematic three-dimensional structure of a right axial stator core of the three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor provided by the embodiment of the application, and fig. 6 is a schematic three-dimensional structure of a rotor of the three-degree-freedom combined type pure electromagnetic bearing for an air compressor provided by the embodiment of the application.
In a specific implementation manner, the three-degree-of-freedom combined pure electromagnetic bearing for the air compressor provided by the embodiment of the application mainly comprises a rotor system and a stator system, wherein the stator system is divided into a left magnetic bearing stator system and a right axial magnetic bearing stator system.
For a rotor system, the rotor system comprises a rotor 1.
For the left magnetic bearing stator system, the left magnetic bearing stator system comprises a left stator core 2, +x-axis left axial windings 3A, -x-axis left axial windings 3B, +y-axis left axial windings 3C, -y-axis left axial windings 3D, +x-axis left radial windings 4A, -x-axis left radial windings 4B, +y-axis left radial windings 4C, and-y-axis left radial windings 4D.
As shown in fig. 1, the left stator core 2 is located radially outside the left end of the rotor 1 in the axial direction, the +x-axis left axial winding 3A, -x-axis left axial winding 3B, +y-axis left axial winding 3C and-y-axis left axial winding 3D are wound around and fixed on axial magnetic poles of the left stator core 2 in the direction of clockwise deflection 22.5 ° in the positive and negative directions orthogonal to the x-axis and y-axis respectively, and the +x-axis left radial winding 4A, -x-axis left radial winding 4B, +y-axis left radial winding 4C and-y-axis left radial winding 4D are wound around and fixed on radial magnetic poles of the left stator core 2 in the direction of anticlockwise deflection 22.5 ° in the positive and negative directions orthogonal to the x-axis and y-axis respectively.
Alternatively, +x-axis left axial winding 3A, -x-axis left axial winding 3B, +y-axis left axial winding 3C, and-y-axis left axial winding 3D are cured on the axial magnetic poles by epoxy glue. The +x-axis left radial winding 4A, -x-axis left radial winding 4B, +y-axis left radial winding 4C, and-y-axis left radial winding 4D are cured on the radial pole by epoxy glue.
For a right axial magnetic bearing stator system, the right axial magnetic bearing stator system comprises a right axial stator core 5 and a right axial winding 6.
As shown in fig. 1, the right axial stator core 5 is located on the right side of the rotor 1 axis, and the right axial winding 6 is wound in an annular groove of the right axial stator core 5 and fixed.
Alternatively, the right axial winding 6 is cured in the annular groove by epoxy glue.
In this embodiment, the right surface of the axial magnetic pole of which the x-axis and y-axis of the left stator core 2 are clockwise deflected by 22.5 ° in the positive and negative directions orthogonal to each other forms an air gap with the left surface of the thrust disk of the rotor 1, the inner surface of the radial magnetic pole of which the x-axis and y-axis of the left stator core 2 are anticlockwise deflected by 22.5 ° in the positive and negative directions orthogonal to each other forms an air gap with the outer surface of the left side of the rotor 1, and the left end surfaces of the inner magnetic pole and the outer magnetic pole of the right axial stator core 5 form an air gap with the right surface of the thrust disk of the rotor 1.
The principle of the scheme is as follows: taking the translation control in the z-axis direction as an example, when the rotor 1 positively deviates from the balance position along the z-axis, the air gap between the left magnetic bearing stator system and the rotor system is reduced, the air gap between the right magnetic bearing stator system and the rotor system is increased, meanwhile, the currents of positive and negative x-axis and y-axis axial windings of the left magnetic bearing stator system are reduced, the current of the axial windings of the right magnetic bearing stator system is increased, and electromagnetic resultant force along the negative z-axis direction is generated to adjust the rotor system to return to the balance position; when the rotor system deviates from the balance position along the negative direction of the z axis, the air gap between the left magnetic bearing stator system and the rotor system is increased, the air gap between the right axial magnetic bearing stator system and the rotor system is reduced, meanwhile, the currents of positive and negative x and y axial windings of the left magnetic bearing stator system are increased, the currents of the axial windings of the right axial magnetic bearing stator system are reduced, and electromagnetic resultant force along the positive direction of the z axis is generated to adjust the rotor 1 to return to the balance position. Meanwhile, the translational control of the two radial degrees of freedom of the magnetic bearing can be realized by utilizing the positive and negative x-axis radial winding currents and the y-axis radial winding currents of the left magnetic bearing subsystem, and the control mode is similar to the translational control of the z-axis direction.
According to the three-degree-of-freedom combined pure-electromagnetic bearing for the air compressor, the left axial magnetic bearing and the radial magnetic bearing are integrated into a whole through the common stator core, so that the functional integrated design of the radial magnetic bearing is realized, and the utilization rate of materials and structural space is improved.
In some embodiments, the rotor 1, left stator core 2 and right axial stator core 5 are 1J22 bars of high saturation magnetic density or electrical pure iron DT4C material.
In some embodiments, the right surface of the axial magnetic pole of which the x axis and the y axis of the left stator core 2 are deflected clockwise by 22.5 degrees in the positive and negative directions orthogonal to each other forms an air gap with the left surface of the thrust disc of the rotor 1, and the size of the air gap is 0.5mm; the inner surface of the radial magnetic pole of the left stator core 2, which deflects 22.5 degrees anticlockwise in the positive and negative directions in the right and the left directions in the right axis, and the outer surface of the left side of the rotor 1 form an air gap, and the size of the air gap is 0.4mm; the left end surfaces of the inner magnetic pole and the outer magnetic pole of the right axial stator core 5 and the right surface of the thrust disc of the rotor 1 form an air gap, and the size of the air gap is 0.5mm.
In some embodiments, the right surface of the axial magnetic pole of which the x-axis and y-axis of the left stator core 2 are clockwise deflected by 22.5 ° in the positive-negative direction is 5mm higher than the right surface of the radial magnetic pole of which the x-axis and y-axis of the left stator core 2 are anticlockwise deflected by 22.5 ° in the positive-negative direction, preventing the radial flux of the left stator core 2 from forming a closed loop through the thrust plate of the rotor 1.
In some embodiments, the design value of the sum of the total areas of the right surfaces of the axial poles of the left stator core 2, which are offset by 22.5 ° clockwise in the positive and negative directions, is equal to 1/5 of the sum of the areas of the inner and outer poles of the right axial stator core 5.
In some embodiments, +x-axis left axial winding 3A, -x-axis left axial winding 3B, +y-axis left axial winding 3C, and-y-axis left axial winding 3D are enameled wires with a wire diameter of 0.95mm, each having 250-300 turns; the +x axis left radial winding 4A, -x axis left radial winding 4B, +y axis left radial winding 4C and-y axis left radial winding 4D are enameled wires with the wire diameter of 0.2mm, and the turns of the enameled wires are 150-200 turns.
In some embodiments, the right axial winding 6 is an enameled wire with a wire diameter of 0.95mm, and the number of turns of the enameled wire is 112-134.
The principle of the scheme is as follows: the application integrates the left axial magnetic bearing and the radial magnetic bearing into a whole by sharing the stator core, thereby realizing the functional integrated design of the radial magnetic bearing. And secondly, the bias magnetic field generated by the bias current and the control magnetic field generated by the control current are used for forward/reverse superposition, so that the stator and rotor air gap of the magnetic bearing is kept uniform, and the non-contact suspension support of the rotor is realized. In addition, through the discrete design of the magnetic poles of the left axial magnetic bearing, the magnetic pole areas and the axial winding numbers of the left axial magnetic bearing and the right axial magnetic bearing are reasonably designed, so that the magnetic force is in the same magnitude. When the rotor is at the balance position, the air gaps between the magnetic pole faces of the left axial magnetic bearing and the right axial magnetic bearing are equal to the air gaps between the thrust discs of the rotor, the electromagnetic attractive force on the two sides is equal, and the axial electromagnetic resultant force born by the magnetic bearing rotor is zero. Taking the translational control in the z-axis direction as an example, as shown in fig. 1, when the rotor deviates from the balance position along the positive direction of the z-axis, the air gap between the magnetic pole face of the left axial magnetic bearing and the thrust disk of the rotor becomes smaller, the air gap between the magnetic pole face of the right axial magnetic bearing and the thrust disk of the rotor becomes larger, meanwhile, the currents of positive and negative x-axis and y-axis axial windings of the left axial magnetic bearing are reduced, the current of the axial windings of the right axial magnetic bearing is increased, and electromagnetic resultant force along the negative direction of the z-axis is generated to adjust the rotor to return to the balance position. When the rotor deviates from the balance position along the negative direction of the z axis, the air gap between the magnetic pole face of the left axial magnetic bearing and the thrust disk of the rotor is increased, the air gap between the magnetic pole face of the right axial magnetic bearing and the thrust disk of the rotor is reduced, meanwhile, the currents of positive and negative x and y axial windings of the left axial magnetic bearing are increased, the current of the axial windings of the right axial magnetic bearing is reduced, and electromagnetic resultant force along the positive direction of the z axis is generated to adjust the rotor to return to the balance position. Meanwhile, the translational control of the two radial degrees of freedom of the magnetic bearing can be realized by utilizing the radial winding current of the left magnetic bearing, and the control mode is similar to the translational control of the z-axis direction.
Compared with the prior art, the application has the advantages that: according to the application, the left axial magnetic bearing and the radial magnetic bearing are integrated into a whole through sharing the stator core, so that the functional integrated design of the radial magnetic bearing is realized, and the utilization rate of materials and structural space is improved; the left axial magnetic bearing magnetic pole adopts a discrete design, so that the magnetic pole areas and the axial winding numbers of the left axial magnetic bearing and the right axial magnetic bearing are reasonably designed, the magnetic force is in the same magnitude, and the control precision of the axial magnetic bearing is improved; the left magnetic bearing radial stator magnetic pole and the axial stator magnetic pole adopt differential design, so that the magnetic force decoupling of the axial magnetic bearing and the radial magnetic bearing is realized, and the high-precision control of the magnetic bearing is further improved.
The application also provides an air compressor and a motor thereof, and the three-degree-of-freedom combined type pure electromagnetic bearing for the air compressor has all the beneficial effects of the three-degree-of-freedom combined type pure electromagnetic bearing for the air compressor, and is not repeated here.
It should be noted that many components mentioned in the present application are common standard components or components known to those skilled in the art, and the structures and principles thereof are known to those skilled in the art through technical manuals or through routine experimental methods.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The three-degree-of-freedom combined pure electromagnetic bearing for the air compressor, the air compressor and the motor thereof provided by the application are described in detail. The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (9)
1. The utility model provides a three degree of freedom combination formula pure electromagnetic bearing for air compressor machine which characterized in that includes:
A rotor system comprising a rotor;
The left magnetic bearing stator system comprises a left stator core, a +x-axis left axial winding, a-x-axis left axial winding, a +y-axis left axial winding, a-y-axis left axial winding, a +x-axis left radial winding, a-x-axis left radial winding, a +y-axis left radial winding and a-y-axis left radial winding; the left stator core is positioned on the radial outer side of the left end of the rotor shaft, and the left stator core comprises: the positive and negative directions of the left stator core are orthogonal, and the positive and negative directions of the left stator core are clockwise deflected by 22.5 degrees, and the positive and negative directions of the left stator core are orthogonal, and the positive and negative directions of the positive stator core are clockwise deflected by 22.5 degrees, and are fixed, and the positive and negative directions of the left stator core are respectively wound on the positive and negative directions of the left stator core are respectively fixed: +x-axis left radial winding, -x-axis left radial winding the +y axis left radial winding and the-y axis left radial winding are respectively wound on radial magnetic poles which deflect by 22.5 degrees anticlockwise in the positive and negative directions of the x axis and the y axis of the left stator core in an orthogonal manner and are fixed; the right surface of an axial magnetic pole of the left stator core, which deflects 22.5 degrees clockwise in the positive and negative directions of the x axis and the y axis of the left stator core, and the left surface of a thrust disc of the rotor form an air gap, and the size of the air gap is 0.5mm; the inner surface of the radial magnetic pole of the left stator core, which deflects 22.5 degrees anticlockwise in the positive and negative directions in the right and left directions, and the outer surface of the left side of the rotor form an air gap, and the size of the air gap is 0.4mm; the left end surfaces of the inner magnetic pole and the outer magnetic pole of the right axial stator core and the right surface of the thrust disc of the rotor form an air gap, and the size of the air gap is 0.5mm;
a right axial magnetic bearing stator system comprising a right axial stator core and a right axial winding; the right axial stator core is positioned at the right side of the rotor shaft, and the right axial winding is wound in an annular groove of the right axial stator core and fixed.
2. The three degree of freedom combined type pure electromagnetic bearing for an air compressor according to claim 1, wherein the following is: the rotor, the left stator core and the right axial stator core are 1J22 bars with high saturation magnetic density or electrical pure iron DT4C materials.
3. The three degree of freedom combined type pure electromagnetic bearing for an air compressor according to claim 1, wherein the following is: the +x-axis left axial winding, -x-axis left axial winding, +y-axis left axial winding and-y-axis left axial winding are solidified on the axial magnetic pole through epoxy resin glue; the method comprises the following steps: the +x-axis left radial winding, -x-axis left radial winding, +y-axis left radial winding and-y-axis left radial winding are cured on the radial magnetic pole through epoxy resin glue; the right axial winding is solidified in the annular groove through epoxy resin glue.
4. The three degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to claim 1, wherein a plane on which a right surface of an axial magnetic pole which is clockwise deflected by 22.5 ° in a positive and negative direction orthogonal to the x-axis and the y-axis of the left stator core is located is 5mm higher than a plane on which a right surface of a radial magnetic pole which is anticlockwise deflected by 22.5 ° in a positive and negative direction orthogonal to the x-axis and the y-axis of the left stator core is located in the axial direction.
5. The three degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to claim 1, wherein a design value of a sum of total areas of right surfaces of axial poles of which x-axis and y-axis of the left stator core are deviated by 22.5 degrees clockwise in orthogonal positive and negative directions is equal to 1/5 of a sum of areas of inner magnetic poles and outer magnetic poles of the right axial stator core.
6. The three degree of freedom combined type pure electromagnetic bearing for an air compressor according to claim 1, wherein the following is: the +x-axis left axial winding, -x-axis left axial winding, +y-axis left axial winding and-y-axis left axial winding are enameled wires with the wire diameter of 0.95mm, and the turns of the enameled wires are all 250-300 turns; the method comprises the following steps: the +x axis left radial winding, -x axis left radial winding, +y axis left radial winding and-y axis left radial winding are enameled wires with the wire diameter of 0.2mm, and the turns of the enameled wires are 150-200 turns.
7. The three-degree-of-freedom combined type pure electromagnetic bearing for the air compressor of claim 1, wherein the right axial winding adopts enameled wires with the wire diameter of 0.95mm, and the turns of the enameled wires are 112-134 turns.
8. An air compressor motor, characterized by comprising the three-degree-of-freedom combined type pure electromagnetic bearing for an air compressor according to any one of claims 1 to 7.
9. An air compressor comprising the air compressor motor of claim 8.
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| CN202410079177.9A CN117570111B (en) | 2024-01-19 | 2024-01-19 | Three-degree-of-freedom combined pure electromagnetic bearing for air compressor, air compressor and motor thereof |
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| CN114198403A (en) * | 2021-12-31 | 2022-03-18 | 淮阴工学院 | Five-degree-of-freedom hybrid magnetic bearing |
| EP4067682A1 (en) * | 2021-03-29 | 2022-10-05 | Maschinenfabrik Rieter AG | Spinning rotor bearing of a rotor spinning device with a rotor shaft and a bearing unit |
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| CN101025199A (en) * | 2007-04-02 | 2007-08-29 | 北京航空航天大学 | Permanent magnet polarized internal rotor radial magnetic bearing |
| CN106402159A (en) * | 2016-12-06 | 2017-02-15 | 中国工程物理研究院材料研究所 | Permanent magnet bias magnetic suspension rotating shaft |
| CN108599505A (en) * | 2018-06-30 | 2018-09-28 | 淮阴工学院 | A kind of five degrees of freedom without bearing switched reluctance machines |
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