CN116488392A - Distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor - Google Patents
Distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor Download PDFInfo
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- CN116488392A CN116488392A CN202310255524.4A CN202310255524A CN116488392A CN 116488392 A CN116488392 A CN 116488392A CN 202310255524 A CN202310255524 A CN 202310255524A CN 116488392 A CN116488392 A CN 116488392A
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- 239000000725 suspension Substances 0.000 title claims abstract description 60
- 238000004804 winding Methods 0.000 title claims abstract description 56
- 238000004146 energy storage Methods 0.000 title claims abstract description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract 6
- 238000005339 levitation Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 14
- 230000001360 synchronised effect Effects 0.000 description 7
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
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- 238000011161 development Methods 0.000 description 4
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- 241000555745 Sciuridae Species 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000018199 S phase Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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
- H02K7/02—Additional mass for increasing inertia, e.g. flywheels
- H02K7/025—Additional mass for increasing inertia, e.g. flywheels for power storage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
-
- 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
- H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
A distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor relates to the technical field of motors. The invention aims to solve the problems that the volume occupation of a magnetic suspension bearing of the existing flywheel motor is large and the control is difficult. The invention relates to a distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor, which comprises a rotor iron core and a rotor permanent magnet, wherein the stator iron core is divided into n sections along the axial direction, the ratio of the number Z of slots of the stator iron core to the number m of phases of the stator winding is even, each phase of stator winding comprises Zm branches, the Zm branches are equally divided into two groups, the branches in the two groups are in one-to-one correspondence to form a Z2m pair of windings, and the two groups of branches are arranged in a central symmetry way by taking the center of the stator iron core as a symmetry center.
Description
Technical Field
The invention belongs to the technical field of motors.
Background
The flywheel energy storage is to store energy through a flywheel rotating at a high speed, so as to realize the cyclic conversion of electric energy and kinetic energy. It is a purely physical energy storage mode.
The latest technology development direction of flywheel energy storage is to adopt a magnetic suspension technology, so that a flywheel rotor rotates in a complete magnetic suspension state in a vacuum environment, friction loss can be reduced to the greatest extent, energy storage density and energy conversion efficiency are improved, and service life is prolonged. Compared with other energy storage technologies, the magnetic suspension flywheel energy storage technology has the advantages of high safety and reliability, long service life, high energy density, high discharge response speed, high energy conversion efficiency, short construction period, no restriction by construction sites, low operation and maintenance cost, green and pollution-free whole life cycle and the like, is wide in application field and huge in market potential, and is an important technical development direction of the energy storage field.
The flywheel energy storage system has the advantages of high energy storage density, high power density, low requirement on environment, modularization, capability of easily detecting the discharge depth, wide application occasions, long service life of flywheel energy storage, simplicity in maintenance and great reduction of electric energy storage cost, and can be charged and discharged for minutes.
Along with the continuous development of the technologies such as power electronics technology, magnetic suspension technology, new material development research and the like, flywheel energy storage technology becomes more and more perfect, the application range also extends to the fields such as traffic, distributed energy systems, power supply, military industry, aerospace, medical treatment, agriculture and the like, and becomes one of the most promising energy storage technologies at present.
In the flywheel energy storage system, a shafting is an important device for power transmission and is also a main part of the energy self-loss of the flywheel, so that the stability, the efficiency and the service life of the flywheel system are affected.
The bearing system of the flywheel can be divided into a mechanical bearing, a contact type magnetic lifting mechanical bearing and a non-contact type magnetic suspension bearing. The friction loss of the traditional mechanical bearing is relatively large in the operation process, and the energy loss in the charging and discharging process is large and the rotating speed is relatively low by adopting the flywheel energy storage system of the mechanical bearing. The contact type magnetic lifting mechanical bearing mainly adopts a magnetic suspension technology to lift the flywheel body, and reduces the bearing capacity of the mechanical bearing, thereby improving the rotating speed of the flywheel and prolonging the service life of the bearing. Although the contact type magnetic lifting mechanical bearing also adopts the magnetic suspension technology, the contact type magnetic lifting mechanical bearing can not achieve a real non-contact magnetic suspension state, is still a mechanical bearing in essence, and still needs to bear load in the running process. Therefore, flywheel products employing contact magnetic lifting mechanical bearings have relatively low rotational speeds, typically less than 8000RPM, and still are "low speed" flywheels. More seriously, the bearings are usually replaced for 3-4 years, and the lubricating oil is also required to be replaced periodically in daily life, so that not only are the equipment replacement and labor cost increased, but also the on-site replacement of the bearings can face a series of problems, such as being limited by on-site space, affecting surrounding running equipment, and more supporting equipment required for disassembly, installation and detection. In addition, the flywheel must be completely stationary for bearing replacement operations, and the flywheel system must take hours to stop, start and vacuumize, which can cause significant loss to the user.
In order to meet the requirements of large capacity, high power, long working time and the like of the flywheel system, the bearing of the advanced flywheel system is required to adopt a magnetic suspension bearing, so that the aims of effectively eliminating mechanical friction, reducing noise and reducing loss are fulfilled. However, the cost of suspending the motor rotor is high, in general, in a magnetic suspension motor, the volume of the magnetic suspension bearing accounts for 60%, and the cost of a controller of the magnetic suspension bearing is high and complex. Magnetic levitation motors are a costly luxury and are not accessible.
Disclosure of Invention
The invention aims to solve the problems that the volume occupation of a magnetic suspension bearing of the existing flywheel motor is large and the control is difficult, and provides a distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor.
The utility model provides a distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor, including coaxial nested pivot, stator and rotor, the stator includes stator core and stator winding, the rotor includes rotor core and rotor permanent magnet, stator core divide into n sections along the axial, n is the positive integer of 3 or more, stator core's slot number Z is the even with stator winding's phase number m, every looks stator winding includes Zm branch road, zm branch road average divide into two sets of, the branch road in two sets of corresponds altogether one by one constitutes Z2m pair of windings, two sets of branch roads are the central symmetry setting with stator core's centre of a circle as the symmetry center.
Furthermore, the distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor further comprises a shell, wherein the rotating shaft, the stator and the rotor are all positioned inside the shell, and two ends of the rotating shaft are connected with the shell through a bearing respectively.
Further, an elastic washer is arranged between the bearing and the shell.
Further, the rotor is externally and coaxially sleeved with a magnetic steel sleeve.
Further, the magnetic steel sleeve is made of non-magnetic metal.
Further, the stator is coaxially nested outside the rotor, and a vacuum cavity is arranged between the outside of the stator and the shell.
Further, the rotor permanent magnet is a surface-mounted permanent magnet.
Further, the rotor permanent magnet is an embedded permanent magnet.
The distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor integrates a radial active natural magnetic suspension technology and an axial passive magnetic suspension technology, fully and naturally suspends the flywheel, and has an excellent synchronous motor driving function. Meanwhile, the vacuum cavity is positioned at the periphery of the outer stator of the flywheel motor, and has large thickness and high strength. Because of natural magnetic suspension, as long as the motor rotates, the flywheel rotor of the motor is naturally in a suspension state, no additional sensor or controller is needed, and the rotating speed of the natural magnetic suspension high-speed flywheel motor can exceed 2 ten thousand revolutions per minute, so that the natural magnetic suspension high-speed flywheel motor has natural and natural high reliability and simplicity.
Drawings
FIG. 1 is a diagram of a stator winding connection structure of a distributed winding natural electromagnetic magnetic levitation energy storage flywheel motor;
FIG. 2 is a schematic radial cross-sectional view of a surface mount magnetic steel flywheel motor;
FIG. 3 is an axial cross-sectional schematic view of an embedded magnet type flywheel motor;
fig. 4 is a schematic radial cross-sectional view of an embedded magnet type flywheel motor.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The first embodiment is as follows: referring to fig. 1 and 2, the embodiment of the present invention specifically describes a distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor, which includes a rotating shaft, a rotor, a stator and a housing 7 coaxially nested from inside to outside, wherein the rotating shaft, the stator and the rotor are all located inside the housing 7, and a vacuum cavity is formed between the stator and the housing. The two ends of the rotating shaft are respectively connected with the shell through a bearing 6, and an elastic washer 8 is arranged between the bearing 6 and the shell. The stator comprises a stator core 1 and stator windings 2. The rotor comprises a rotor core 3 and rotor permanent magnets 4.
The stator core 1 is divided into 9 sections in the axial direction so as to obtain a larger passive magnetic levitation capability in the axial direction. The gap lambda=1δ -2δ between each segment, δ being the electromagnetic air gap of the motor. When lambda is smaller than 4-5 times of the axial length of each section, the axial magnetic suspension rigidity is in direct proportion to the number of sections n. The maximum rigidity of the segmented axial passive magnetic suspension is approximately as follows: 0.95nK (Nmmm), wherein K (Nmmm) is the stiffness of single-segment axial passive magnetic levitation. However, the axial effective working range of magnetic levitation is reduced, approximately: 0.95 lambda.
The inner circumferential surface of the stator core 1 is provided with 24 axial stator slots, each stator slot is internally provided with two stator magnetic poles, and the same stator magnetic pole is respectively positioned in two adjacent stator slots. The stator winding 2 is 3 phases, the head end of each phase generates a port of a UVW three-phase winding, and the tail end of each phase generates a midpoint O of the UVW three-phase winding; the U, V, W three-phase port of the three-phase winding and the midpoint of one three-phase winding are finally formed. Each phase of stator winding 2 comprises 8 branches, the 8 branches are equally divided into two groups, and the branches in the two groups are in one-to-one correspondence to form 4 pairs of windings. The head ends of the 4 pairs of windings are connected in parallel, and the tail ends of the 4 pairs of windings are connected in parallel. The two groups of branches are arranged in a central symmetry way by taking the center of the stator core 1 as a symmetry center.
Specifically, attractive force exists between the stator core 1 and the rotor permanent magnet 4, the air gap between the stator and the rotor is kept equal under the action of the bearing 6, the attractive force is equal everywhere along the circumference, and the radial attractive force in the air gap of the motor is equal everywhere and counteracts each other through the bearing 6. However, if the motor rotates and the bearing 6 fails, the air gaps on the same diameter on both sides of the rotating shaft are inevitably deviated, the rotor permanent magnet 4 is attracted to the side with small air gap, the counter potential of the parallel branch on the side with small air gap is inevitably increased, and the current is decreased; in contrast, the counter potential of the parallel branch on the side with the large air gap becomes smaller, the current becomes larger, the radial pulling force on the side with the large air gap becomes larger, the radial pulling force on the side with the small air gap becomes smaller, the air gap is inevitably changed in the direction of smaller deviation, and the air gap deviation is stabilized. In the embodiment, two groups of branches in each phase of windings are arranged in a central symmetry manner and can generate a force couple moment with the central symmetry, so that the motor has the ability of radial natural magnetic suspension recovery centering after rotating. Since the three-phase winding of the present embodiment has 12 pairs of parallel branches with central symmetry, the motor rotor centering can be actively recovered from 24 directions. Since the permanent magnet rotor is randomly attracted to the side with small air gap due to zero back electromotive force and no radial natural magnetic suspension restoring force when the motor is not started in the non-rotating initial state, the permanent magnet rotor body is radially unstable when the motor is not started to rotate, and the bearing 6 is started in this embodiment. Under the condition of not adding any sensor and controller, the embodiment adopts the traditional motor driving method to have the dynamic radial natural electromagnetic magnetic suspension and passive axial magnetic suspension functions. As a permanent magnet motor, the motor of the invention has excellent four-quadrant control function.
In summary, although the motor rotor of the present embodiment does not have static radial electromagnetic magnetic levitation capability when not rotated, but only axial passive magnetic levitation capability, the bearing 6 can be used to perform radial support. Because the rotating speed of the motor is zero, the bearing 6 is very small in stress, and once the motor is started, the radial electromagnetic magnetic suspension of the motor immediately acts, so that the motor in the embodiment has the dynamic radial natural electromagnetic magnetic suspension and the passive axial magnetic suspension functions.
Further, in the present embodiment, the rotor permanent magnet 4 is a surface-mounted permanent magnet. The outer circle of the 4-pole permanent magnet is sleeved with a conductive layer and a magnetic steel sleeve 5. The magnetic steel sleeve 5 may be made of the following materials: non-magnetic metallic materials such as aluminum, copper, stainless steel, etc. The present embodiment is a synchronous motor capable of induction asynchronous starting, and automatically enters the synchronous motor to operate after reaching the vicinity of the synchronous rotational speed, and is actually provided with: static and dynamic natural electromagnetic magnetic suspension motor.
In this embodiment, in order to increase the variation in load on the output shaft, the bearing 6 is used, and the size of the bearing 6 may be smaller than that of a conventional bearing in order to reduce bearing friction. The outer circumference of the bearing 6 is sleeved with an elastic washer 8 so as to provide mechanical buffering and reduce vibration and noise of the motor. The bearing gap of the bearing 6 increases from the negative gap to 0.1 to 1mm. The axial center of the motor output shaft is kept stable under the action of natural electromagnetic magnetic suspension restoring force. At this time, the natural electromagnetic magnetic levitation can rotate the motor rotor in a state where the energy loss tends to be minimized, so that vibration and noise are minimized, although there is the bearing 6.
The second embodiment is as follows: referring to fig. 1, 3 and 4 for specifically explaining the present embodiment, the distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor according to the present embodiment includes a rotating shaft, a rotor, a stator and a housing 7 coaxially nested from inside to outside, the rotating shaft, the stator and the rotor are all located inside the housing 7, two ends of the rotating shaft are respectively connected with the housing through a bearing 6, and an elastic washer 8 is disposed between the bearing 6 and the housing. The stator comprises a stator core 1 and stator windings 2. The rotor comprises a rotor core 3 and rotor permanent magnets 4.
The stator core 1 is divided into 9 sections in the axial direction so as to obtain a larger passive magnetic levitation capability in the axial direction. The gap lambda=1δ -2δ between each segment, δ being the electromagnetic air gap of the motor. When lambda is smaller than 4-5 times of the axial length of each section, the axial magnetic suspension rigidity is in direct proportion to the number of sections n. The maximum rigidity of the segmented axial passive magnetic suspension is approximately as follows: 0.950.95nK (Nmmm), where K (Nmmm) is the stiffness of the single-segment axial passive magnetic levitation. However, the axial effective working range of magnetic levitation is reduced, approximately: 0.95 lambda.
The inner circumferential surface of the stator core 1 is provided with 24 axial stator slots, each stator slot is internally provided with two stator magnetic poles, and the same stator magnetic pole is respectively positioned in two adjacent stator slots. The stator winding 2 is 3 phases, the head end of each phase generates a port of a UVW three-phase winding, and the tail end of each phase generates a midpoint O of the UVW three-phase winding; the U, V, W three-phase port of the three-phase winding and the midpoint of one three-phase winding are finally formed. Each phase of stator winding 2 comprises 8 branches, the 8 branches are equally divided into two groups, and the branches in the two groups are in one-to-one correspondence to form 4 pairs of windings. The head ends of the 4 pairs of windings are connected in parallel, and the tail ends of the 4 pairs of windings are connected in parallel. The two groups of branches are arranged in a central symmetry way by taking the center of the stator core 1 as a symmetry center.
Specifically, attractive force exists between the stator core 1 and the rotor permanent magnet 4, the air gap between the stator and the rotor is kept equal under the action of the bearing 6, the attractive force is equal everywhere along the circumference, and the radial attractive force in the air gap of the motor is equal everywhere and counteracts each other through the bearing 6. However, if the motor rotates and the bearing 6 fails, the air gaps on the same diameter on both sides of the rotating shaft are inevitably deviated, the rotor permanent magnet 4 is attracted to the side with small air gap, the counter potential of the parallel branch on the side with small air gap is inevitably increased, and the current is decreased; in contrast, the counter potential of the parallel branch on the side with the large air gap becomes smaller, the current becomes larger, the radial pulling force on the side with the large air gap becomes larger, the radial pulling force on the side with the small air gap becomes smaller, the air gap is inevitably changed in the direction of smaller deviation, and the air gap deviation is stabilized. In the embodiment, two groups of branches in each phase of windings are arranged in a central symmetry manner and can generate a force couple moment with the central symmetry, so that the motor has the ability of radial natural magnetic suspension recovery centering after rotating. Since the three-phase winding of the present embodiment has 12 pairs of parallel branches with central symmetry, the motor rotor centering can be actively recovered from 24 directions. Since the permanent magnet rotor is randomly attracted to the side with small air gap due to zero back electromotive force and no radial natural magnetic suspension restoring force when the motor is not started in the non-rotating initial state, the permanent magnet rotor body is radially unstable when the motor is not started to rotate, and the bearing 6 is started in this embodiment. Under the condition of not adding any sensor and controller, the embodiment adopts the traditional motor driving method to have the dynamic radial natural electromagnetic magnetic suspension and passive axial magnetic suspension functions. As a permanent magnet motor, the motor of the invention has excellent four-quadrant control function.
In summary, although the motor rotor of the present embodiment does not have static radial electromagnetic magnetic levitation capability when not rotated, but only axial passive magnetic levitation capability, the bearing 6 can be used to perform radial support. Because the rotating speed of the motor is zero, the bearing 6 is very small in stress, and once the motor is started, the radial electromagnetic magnetic suspension of the motor immediately acts, so that the motor in the embodiment has the dynamic radial natural electromagnetic magnetic suspension and the passive axial magnetic suspension functions.
Further, in the present embodiment, the rotor permanent magnet 4 is an embedded 4-pole permanent magnet. The outer circle of the rotor is uniformly distributed with 16 squirrel cage guide bars, and the axial end part of the rotor is provided with a squirrel cage end ring, so that the motor with induction starting capability is formed. The method can be used as a synchronous motor started in an induction asynchronous mode, and can automatically enter the synchronous motor to operate after the asynchronous mode reaches the vicinity of the synchronous rotating speed, and the motor with static and dynamic natural electromagnetic magnetic suspension is formed.
In this embodiment, in order to increase the variation in load on the output shaft, the bearing 6 is used, and the size of the bearing 6 may be smaller than that of a conventional bearing in order to reduce bearing friction. The outer circumference of the bearing 6 is sleeved with an elastic washer 8 so as to provide mechanical buffering and reduce vibration and noise of the motor. The bearing gap of the bearing 6 increases from the negative gap to 0.1 to 1mm. The axial center of the motor output shaft is kept stable under the action of natural electromagnetic magnetic suspension restoring force. At this time, the natural electromagnetic magnetic levitation can rotate the motor rotor in a state where the energy loss tends to be minimized, so that vibration and noise are minimized, although there is the bearing 6.
By adopting the radial natural electromagnetic magnetic suspension technology, the axial passive magnetic suspension and the bearing can completely eliminate the volume, the loss and the cost. All currents in the motor winding participate in naturally suspending the motor rotor, so that the natural electromagnetic magnetic suspension force can be provided greatly. The invention provides a flywheel motor which is suspended in a vacuum cavity and has excellent motor four-quadrant control function, and the rotating speed of the natural magnetic suspension high-speed flywheel motor can exceed 2 ten thousand revolutions per minute. The vacuum cavity is positioned at the periphery of the outer stator of the flywheel motor, and has large thickness and high strength. Because of natural magnetic suspension, no additional sensor or controller is needed, and the flywheel rotor of the motor is naturally in a suspension state as long as the motor rotates, so that the motor has natural and natural high reliability and simplicity. The vacuum cavity of the invention has only three connecting lines of the motor inside and outside, and the interface is very simple and reliable.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (8)
1. A distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor, which comprises a coaxially nested rotating shaft, a stator and a rotor, wherein the stator comprises a stator iron core (1) and a stator winding (2), the rotor comprises a rotor iron core (3) and a rotor permanent magnet (4),
the stator core is characterized in that the stator core (1) is divided into n sections along the axial direction, n is a positive integer greater than or equal to 3, the ratio of the number Z of slots of the stator core (1) to the number m of phases of the stator winding (2) is an even number, each phase of the stator winding (2) comprises Zm branches, the Zm branches are equally divided into two groups, the branches in the two groups are in one-to-one correspondence to form a Z2m pair of windings, and the two groups of branches are arranged in center symmetry by taking the center of the stator core (1) as a symmetry center.
2. The distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor according to claim 1, further comprising a housing (7), wherein the rotating shaft, the stator and the rotor are all located inside the housing (7), and two ends of the rotating shaft are connected with the housing through a bearing (6).
3. A distributed winding natural electromagnetic magnetic levitation energy storage flywheel motor as claimed in claim 2, characterized in that an elastic washer (8) is arranged between the bearing (6) and the housing.
4. A distributed winding natural electromagnetic magnetic levitation energy storage flywheel motor as claimed in claim 1, 2 or 3, wherein the rotor is externally and coaxially sleeved with a magnetic steel sleeve (5).
5. A distributed winding natural electromagnetic magnetic levitation energy storage flywheel motor as claimed in claim 4 wherein the magnetic steel sleeve (5) is made of non-magnetic metal.
6. The distributed winding natural electromagnetic magnetic levitation energy storage flywheel motor as claimed in claim 4, wherein the stator is coaxially nested outside the rotor, and a vacuum cavity is arranged between the outside of the stator and the housing (7).
7. The distributed winding natural electromagnetic magnetic levitation energy storage flywheel motor as defined in claim 6, wherein the rotor permanent magnet (4) is a surface-mounted permanent magnet.
8. A distributed winding natural electromagnetic magnetic levitation energy storage flywheel motor as defined in claim 6 wherein the rotor permanent magnet (4) is an embedded permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255524.4A CN116488392A (en) | 2023-03-16 | 2023-03-16 | Distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255524.4A CN116488392A (en) | 2023-03-16 | 2023-03-16 | Distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor |
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| CN202310255524.4A Pending CN116488392A (en) | 2023-03-16 | 2023-03-16 | Distributed winding natural electromagnetic magnetic suspension energy storage flywheel motor |
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