CN115765291A - Outer rotor switch flux motor type steel wire winding prestress electronic flywheel energy storage device - Google Patents
Outer rotor switch flux motor type steel wire winding prestress electronic flywheel energy storage device Download PDFInfo
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- CN115765291A CN115765291A CN202211623453.0A CN202211623453A CN115765291A CN 115765291 A CN115765291 A CN 115765291A CN 202211623453 A CN202211623453 A CN 202211623453A CN 115765291 A CN115765291 A CN 115765291A
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- 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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Abstract
An outer rotor switch magnetic flux motor type steel wire winding prestress electronic flywheel energy storage device comprises a motor shaft, wherein the motor shaft is connected to a machine body through a bearing system, an outer rotor switch magnetic flux permanent magnet motor is connected to the motor shaft, and the outer side of the outer rotor switch magnetic flux permanent magnet motor is connected with a combined flywheel formed by matching an ultrahigh-strength fiber steel wire winding type wheel rim with multiple axial hubs; the combined flywheel comprises a steel wire, a wheel rim and a plurality of wheel hubs, the inner sides of the plurality of wheel hubs are axially and circumferentially positioned on the motor rotor through positioning spacer bushes and positioning keys, the outer sides of the plurality of wheel hubs are connected with the wheel rim, and the steel wire is wound on the outer circle of the wheel rim; the vacuum chamber is made of metal materials, so that energy loss caused by mechanical friction is reduced; the combined flywheel is adopted, so that the stored energy is increased to the maximum extent; and the stability and the efficiency of a flywheel energy storage system are improved by adopting a switching flux motor.
Description
Technical Field
The invention belongs to the technical field of electric energy storage and release, and particularly relates to an outer rotor switch flux motor type steel wire winding prestress electronic flywheel energy storage device.
Background
The electronic flywheel is an electric energy storage and release technology which is developed in recent years and has high energy density, long service life, high reliability and low cost, and the technology is characterized in that firstly, the electric energy drives a motor to rotate and is converted into the rotation kinetic energy of the flywheel to be stored, and then the kinetic energy of the flywheel rotation drives the motor to generate electricity when the electric energy is needed, so that the electronic flywheel has the electric energy storage and release function.
The electronic flywheel consists of a motor mechanical body subsystem and a driving and controlling subsystem, and comprises a flywheel rotating at a high speed, a motor with the function of a motor and the function of a generator integrated, a rotating shaft, a bearing, a power electronic conversion controller for driving and controlling, a vacuum chamber, a machine body and the like.
In the process of keeping the electric energy of the electronic flywheel, in order to reduce the energy loss as much as possible, the magnetic suspension bearing is adopted to enable the flywheel to be in a suspension state, and the energy loss caused by mechanical friction at the bearing is reduced, but the magnetic suspension bearing is not developed yet, the cost is high, the process difficulty is high, and the use occasions are limited.
In an electronic flywheel energy storage system, a fiber winding machine is generally adopted for winding continuous carbon fibers soaked with epoxy resin on a core mold in an annular mode to manufacture a composite flywheel in the conventional flywheel, but the composite flywheel is expensive in processing and manufacturing cost due to the high cost of a composite material and a winding mold thereof; the electronic flywheel adopting the steel fiber has compact size, small structure and reasonable price; meanwhile, the size of the flywheel can be greatly reduced by adopting the steel fiber, and the unit mass energy storage density of the electronic flywheel is obviously improved.
In the existing electronic flywheel energy storage system, the main types of the adopted motors/generators are induction motors, reluctance motors and permanent magnet motors; the permanent magnet synchronous motor has the advantages of high efficiency and high power density, and becomes a preferred motor type of an electronic flywheel, but the permanent magnet is easily influenced by vibration and high temperature when being placed on a rotor, so that the permanent magnet is demagnetized, and the motor is damaged; the reluctance motor has low loss and wide speed regulation range, meets the requirements of an electronic flywheel system on the motor, but has the problems of large noise and large torque fluctuation, thus causing low system efficiency.
An electronic flywheel energy storage device widely applied at present, for example, a Chinese patent flywheel energy storage device (publication No. CN 110611397A) adopts a series connection structure of a motor and a flywheel, a flywheel energy storage element adopts a single cylindrical wheel rim, and the flywheel adopts a carbon fiber composite material or a simple blocky non-fiber carbon steel metal material, so that the electronic flywheel energy storage device has the following defects: (1) The non-metallic material compounded by the carbon fiber and the epoxy resin and the winding mould thereof have high cost, small density, low rotational inertia, small power density and large size; (2) The flywheel is made of blocky non-fiber carbon steel metal materials, the allowable stress of the flywheel generally does not exceed 300MPa, the flywheel is subjected to larger centrifugal force at higher rotating speed to have cracking risk, and the blocky metal materials are difficult to reach higher energy storage density; (3) The mechanical structure mode that the motor and the flywheel are connected in series is adopted, the structure is not compact, and the energy storage density of unit mass is small; (4) The motor structure mode of an outer stator and an inner rotor is adopted, the radial size of the motor rotor is small, the contribution of the rotational inertia of the motor to energy storage is small, and the structure is huge.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an outer rotor switch magnetic flux motor type steel wire winding prestress electronic flywheel energy storage device, wherein a vacuum chamber is made of a metal material, so that the energy loss caused by mechanical friction is reduced; the combined flywheel formed by matching the ultrahigh-strength fiber steel wire wound type wheel rim and the axial multi-hub is adopted, so that the energy storage capacity is increased to the maximum extent; and the stability and the efficiency of a flywheel energy storage system are improved by adopting a switching flux motor.
In order to achieve the purpose, the invention adopts the technical scheme that:
an outer rotor switch magnetic flux motor type steel wire wound prestress electronic flywheel energy storage device comprises a motor shaft 12, wherein the motor shaft 12 is connected to a machine body 36 through a bearing system, an outer rotor switch magnetic flux permanent magnet motor is connected to the motor shaft 12, and a combined flywheel formed by matching an ultrahigh strength fiber steel wire wound type wheel rim and axial multiple hubs is connected to the outer side of the outer rotor switch magnetic flux permanent magnet motor;
the combined flywheel comprises a steel wire 1, a rim 2 and a plurality of hubs 3, the inner sides of the plurality of hubs 3 are axially and circumferentially positioned on a motor rotor 6 through positioning spacer bushes 4 and positioning keys 5, the outer sides of the plurality of hubs 3 are connected with the rim 2, and the outer circle of the rim 2 is wound with the steel wire 1.
When the rotating speed is ultrahigh, the wheel rim 2 adopts a radial split structure, and the wheel rim 2 and the multiple hubs 3 are matched in a gear mode; the outer circle of the rim 2 is provided with a groove, and the steel wire 1 is wound on the groove of the rim 2 in a gradient winding mode with gradually decreased tension.
When low rotational speed, rim 2 adopts monolithic structure, and rim 2 and many wheel hub 3 adopt interference fit, have made the initial compressive stress on both contact surfaces, reserve the recess on 2 excircles of rim, and steel wire 1 adopts the degressive tension gradient winding mode winding of successive layer on 2 reserve the recess of rim.
The outer rotor switch flux permanent magnet motor comprises a motor rotor 6 and a motor stator 13; the motor stator 13 is arranged on the motor shaft 12, and the motor positioning sleeve 23 is arranged on the motor shaft 12 to realize the axial positioning of the motor stator 13; a permanent magnet 7 is arranged in a stator slot of a motor stator 13, and an armature winding 8 is wound on the motor stator 13 in a double-layer concentrated winding mode; the cooling pipe 37 is wound in an S-shape on the motor stator 6.
The outer rotor switch magnetic flux permanent magnet motor adopts a rotary transformer to acquire the position of a motor rotor 6, the rotary transformer comprises a rotary transformer stator 24, a rotary transformer rotor 25 and a rotary transformer rotor seat 26, and the rotary transformer stator 24 is fixedly connected to an end cover flange 30; the rotary transformer rotor 25 is mounted on a rotary transformer sub-base 26, and the rotary transformer sub-base 26 is fixedly connected with the bearing base 18.
The bearing system comprises a plurality of deep groove ball bearings 10, the deep groove ball bearings 10 are installed on a motor shaft 12, axial positioning of the deep groove ball bearings 10 is achieved through a sleeve 28, the outer rings of the deep groove ball bearings 10 move together with bearing blocks 18, the bearing blocks 18 on two sides are fixedly connected with the multiple hubs 3, and meanwhile axial positioning of a motor rotor 6 is achieved.
The motor shaft 12 is assembled on the end cover 17 through a first round nut 27, the end cover 17 is tightened and fixed through a support column 16 and a second round nut 38 and is matched with the vacuum cover 21 to form an inner space, and the vacuum cover 21 is fixed on the machine body 36 through a support frame 35; a first lead 14 of the armature winding 8 is led out through a lead-out hole 22 on a motor shaft 12, and a second lead 11 of the rotary transformer is led out through a lead-out hole in the middle of a fine-tooth bolt 33 arranged on an end cover 17; the inner space of the electronic flywheel system is vacuumized through the one-way valve 34 on the end cover 17, and the sealed vacuum chamber 15 is formed.
The steel wire 1 adopts ultrahigh strength metal fiber of 2000 MPa-3000 MPa.
The wheel rim 2 is made of metal materials.
Compared with the prior art, the invention has the following advantages:
(1) The invention adopts the ultrahigh strength metal fiber of 2000 MPa-3000 MPa to wind on the rim of the outermost side of the rotating part of the flywheel, thereby obviously reducing the processing cost compared with the carbon fiber composite material flywheel, improving the strength compared with the simple block-shaped non-fiber carbon steel metal flywheel, and having the advantages of high rotational inertia and high rotational speed.
(2) When the flywheel is in high rotating speed, the flywheel adopts a mechanical structure with a plurality of hubs in the axial direction, a plurality of split wheel rims in the radial direction and a high-strength steel wire to tightly press the wheel rims on the wheel rims in a prestress mode. When the rotating speed is low, the mechanical structure of the flywheel adopts an integral type wheel rim, the wheel rim is in interference fit with multiple wheel hubs, and a groove on the outer circle of the wheel rim is wound with a steel wire to form a combined type flywheel. The two structures of the flywheel at high and low rotating speeds reduce the dead weight of the flywheel, the weight is concentrated on the outer edge of the flywheel, the rotational inertia is improved, and the phenomenon that the rim massive metal cracks under the action of great centrifugal force is avoided.
(3) The invention adopts an integrated structure of the outer rotor switch magnetic flux motor and the combined flywheel, the rotating part of the flywheel is the rotor of the motor, the structure is compact, and the energy storage density of the unit mass of the flywheel is high.
(4) The invention adopts the switching flux permanent magnet motor of the outer rotor inner stator, and arranges the permanent magnet on the non-rotating inner stator, thereby avoiding the risk that the permanent magnet is thrown out at high rotating speed when the permanent magnet is arranged on the rotor in the traditional permanent magnet synchronous motor.
Drawings
Fig. 1 is a front sectional view of an embodiment of the present invention.
FIG. 2 is a structural view of the flywheel assembly of the present invention.
Fig. 3 is a structural view of the wire wound type split rim of the present invention.
Fig. 4 is a structural view of a wire-wound type integral rim according to the present invention.
Fig. 5 is a structural diagram of an outer rotor switching flux permanent magnet motor of the present invention.
Fig. 6 is a partial enlarged view of the point i in fig. 1.
Fig. 7 is a left side view of an embodiment of the present invention.
Fig. 8 is a partial cross-sectional view of a tension strut in accordance with the present invention.
Detailed Description
The present invention will be described in detail below with reference to examples and the accompanying drawings.
As shown in fig. 1 and 2, an outer rotor switch flux motor type steel wire wound prestressed electronic flywheel energy storage device comprises a combined flywheel formed by matching an ultra-high strength fiber steel wire wound type rim with a plurality of axial hubs, an outer rotor switch flux permanent magnet motor, a bearing system, a motor shaft 12 and a machine body 36; the motor shaft 12 is connected to the body 36 through a bearing system, the motor shaft 12 is connected to an outer rotor switch magnetic flux permanent magnet motor, and the outer side of the outer rotor switch magnetic flux permanent magnet motor is connected to a combined flywheel formed by matching an ultrahigh-strength fiber steel wire winding type rim and a plurality of axial hubs.
The combined flywheel comprises a steel wire 1, a rim 2 and a plurality of hubs 3, the inner sides of the plurality of hubs 3 are axially and circumferentially positioned on a motor rotor 6 through a positioning spacer 4 and a positioning key 5, the outer sides of the plurality of hubs 3 are connected with the rim 2, and the steel wire 1 is wound on the outer circle of the rim 2.
As shown in fig. 1, 2 and 3, at ultrahigh rotation speed, the rim 2 adopts a radial split structure, and the rim 2 and the multiple hubs 3 are matched in a gear manner; the reserved groove is arranged on the outer circle of the rim 2, the steel wire 1 is wound on the reserved groove of the rim 2 in a gradual decrease tension gradient winding mode layer by layer, and the cracking risk of the metal rim 2 and the multi-hub 3 at a high rotating speed is effectively reduced.
As shown in fig. 1, 2 and 4, at a lower rotation speed, the rim 2 adopts an integral structure, the rim 2 and the multiple hubs 3 adopt interference fit, so that the contact surfaces of the rim 2 and the multiple hubs have initial compressive stress, the outer circle of the rim 2 is provided with a groove, and the steel wire 1 is wound on the groove of the rim 2 by adopting a gradient winding mode of gradually decreasing tension.
As shown in fig. 1, 5, 6, and 7, the outer rotor switched flux permanent magnet motor includes a motor rotor 6, a permanent magnet 7, a winding 8, and a motor stator 13; the motor stator 13 is arranged on the motor shaft 12 through the flat key 9, and a motor positioning sleeve 23 matched with the motor stator 13 is arranged on the motor shaft 12 to realize the axial positioning of the motor stator 13; a permanent magnet 7 is arranged in a stator slot of a motor stator 13 by heat-resistant glue, and an armature winding 8 is wound on the motor stator 13 in a double-layer concentrated winding mode; the motor rotor 6 matched with the motor stator 13 is connected with the inner side of the multi-hub 3 through a plurality of keys 19; the motor stator 6 is wound with a cooling pipe 37 in an S shape, and the cooling liquid flows through the cooling pipe 37 to cool the driving motor.
The outer rotor switch magnetic flux permanent magnet motor adopts a rotary transformer to acquire the position of a motor rotor 6, the rotary transformer comprises a rotary transformer stator 24, a rotary transformer rotor 25 and a rotary transformer rotor seat 26, and the rotary transformer stator 24 is fixedly connected to an end cover flange 30 through a positioning screw 32; a rotary transformer rotor 25 matched with the rotary transformer stator 24 is arranged on a rotary transformer rotor base 26 and is axially positioned through an elastic retainer ring 29; the rotary transformer sub-mount 26 is fixedly connected to the bearing mount 18 by screws 31.
As shown in fig. 1 and 6, the bearing system includes a plurality of deep groove ball bearings 10, the deep groove ball bearings 10 are mounted on a motor shaft 12, axial positioning of the deep groove ball bearings 10 is achieved through a sleeve 28, an outer ring of the deep groove ball bearings 10 moves together with bearing blocks 18, the bearing blocks 18 on two sides are fixedly connected with a multi-hub 3 through screws 20, and axial positioning of a motor rotor 6 is achieved at the same time.
As shown in fig. 1, 6, 7 and 8, the motor shaft 12 is assembled on the end cover 17 through the first round nut 27, the end cover 17 is fastened by the pillar 16, the second round nut 38, the first washer 39 and the second washer 40, and forms an inner space by cooperating with the vacuum cover 21, and the vacuum cover 21 is fixed on the body 36 through the support frame 35; a first lead 14 of the armature winding 8 is led out through a lead-out hole 22 on a motor shaft 12, a second lead 11 of the rotary transformer is led out through a lead-out hole in the middle of a fine-tooth bolt 33 arranged on an end cover 17, and the lead-out hole is sealed by sealant; the inner space of the electronic flywheel system is vacuumized through the one-way valve 34 on the end cover 17, and the sealed vacuum chamber 15 is formed.
The steel wire 1 adopts ultrahigh strength metal fiber of 2000 MPa-3000 MPa.
The wheel rim 2 is made of metal materials.
The working principle of the invention is as follows:
the switch flux permanent magnet motor adopting the outer rotor and the inner stator has the advantages that the motor rotor 6 is directly connected with the energy storage element, and the energy storage element is not a single circular rim any more; when the rotating speed is ultrahigh, an axial multi-hub 3 and radial multi-split wheel rim 2 gear matching structure is adopted, a groove is reserved on the excircle of the wheel rim 2, and a steel wire 1 is wound on the excircle of the wheel rim 2 to form a combined flywheel; at low rotating speed, an integral type wheel rim and an axial multi-hub interference fit structure can be adopted; the rim 2 is made of metal materials, the density and the rotational inertia are improved compared with fiber composite materials, and the steel wire 1 is wound to effectively reduce the cracking tendency of the rim 2 under high rotating speed and high centrifugal force; the multi-hub 3 is matched with the wheel rim 2 in a gear mode, so that the motor rotor 6 and the combined flywheel rotate together at the same rotating speed; the high-precision deep groove ball bearing 10 is used as a supporting system, the end cover 17 is tensioned through the support column 16 and the second round nut 38 and matched with the vacuum cover 21, the inner space of the electronic flywheel system is vacuumized through the one-way valve 34 on the end cover 17, the closed vacuum chamber 15 is formed, and energy loss caused by mechanical friction is reduced.
Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes, modifications, and equivalents may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An outer rotor switch magnetic flux motor type steel wire winding prestress electronic flywheel energy storage device comprises a motor shaft (12), wherein the motor shaft (12) is connected to a machine body (36) through a bearing system, an outer rotor switch magnetic flux permanent magnet motor is connected to the motor shaft (12), and a combined flywheel formed by matching an ultrahigh-strength fiber steel wire winding type wheel rim and axial multi-wheel hubs is connected to the outer side of the outer rotor switch magnetic flux permanent magnet motor;
the combined flywheel comprises a steel wire (1), a rim (2) and a plurality of hubs (3), wherein the inner sides of the plurality of hubs (3) are axially and circumferentially positioned on a motor rotor (6) through a positioning spacer bush (4) and a positioning key (5), the outer sides of the plurality of hubs (3) are connected with the rim (2), and the outer circle of the rim (2) is wound with the steel wire (1).
2. The apparatus of claim 1, wherein: when the rotating speed is ultrahigh, the wheel rim (2) adopts a radial split structure, and the wheel rim (2) is matched with the multiple hubs (3) in a gear mode; the outer circle of the wheel rim (2) is provided with a groove, and the steel wire (1) is wound on the groove of the wheel rim (2) in a gradient winding mode with gradually decreased tension.
3. The apparatus of claim 1, wherein: when low rotational speed, rim (2) adopt monolithic structure, and rim (2) and many wheel hubs (3) adopt interference fit, have made and have had initial compressive stress on both contact surfaces, reserve the recess on rim (2) excircle, and steel wire (1) adopts the degressive tension gradient winding mode winding of successive layer on rim (2) reserve the recess.
4. The apparatus of claim 1, wherein: the outer rotor switch flux permanent magnet motor comprises a motor rotor (6) and a motor stator (13); the motor stator (13) is arranged on the motor shaft (12), and the motor positioning sleeve (23) is arranged on the motor shaft (12) to realize the axial positioning of the motor stator (13); a permanent magnet (7) is arranged in a stator slot of a motor stator (13), and an armature winding (8) is wound on the motor stator (13) in a double-layer concentrated winding mode; the motor stator (6) is wound with an S-shaped cooling pipe (37).
5. The apparatus of claim 4, wherein: the outer rotor switch magnetic flux permanent magnet motor adopts a rotary transformer to collect the position of a motor rotor (6), the rotary transformer comprises a rotary transformer stator (24), a rotary transformer rotor (25) and a rotary transformer rotor seat (26), and the rotary transformer stator (24) is fixedly connected to an end cover flange (30); the rotary transformer rotor (25) is arranged on the rotary transformer rotor base (26), and the rotary transformer rotor base (26) is fixedly connected with the bearing base (18).
6. The apparatus of claim 5, wherein: the bearing system comprises a plurality of deep groove ball bearings (10), the deep groove ball bearings (10) are installed on a motor shaft (12), axial positioning of the deep groove ball bearings (10) is achieved through a sleeve (28), the outer rings of the deep groove ball bearings (10) move together with bearing seats (18), the bearing seats (18) on two sides are fixedly connected with a plurality of hubs (3), and meanwhile axial positioning of a motor rotor (6) is achieved.
7. The apparatus of claim 5, wherein: the motor shaft (12) is assembled on the end cover (17) through a first round nut (27), the end cover (17) is tightened and fixed through a support column (16) and a second round nut (38) and is matched with the vacuum cover (21) to form an inner space, and the vacuum cover (21) is fixed on the machine body (36) through a support frame (35); a first lead (14) of the armature winding (8) is led out through a lead-out hole (22) on a motor shaft (12), and a second lead (11) of the rotary transformer is led out through a lead-out hole in the middle of a fine-tooth bolt (33) arranged on an end cover (17); the inner space of the electronic flywheel system is vacuumized through a one-way valve (34) on an end cover (17) to form a closed vacuum chamber (15).
8. The apparatus of claim 1, wherein: the steel wire (1) adopts ultrahigh strength metal fiber of 2000 MPa-3000 MPa.
9. The apparatus of claim 1, wherein: the wheel rim (2) is made of metal materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211623453.0A CN115765291A (en) | 2022-12-16 | 2022-12-16 | Outer rotor switch flux motor type steel wire winding prestress electronic flywheel energy storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211623453.0A CN115765291A (en) | 2022-12-16 | 2022-12-16 | Outer rotor switch flux motor type steel wire winding prestress electronic flywheel energy storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115765291A true CN115765291A (en) | 2023-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211623453.0A Pending CN115765291A (en) | 2022-12-16 | 2022-12-16 | Outer rotor switch flux motor type steel wire winding prestress electronic flywheel energy storage device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115765291A (en) |
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2022
- 2022-12-16 CN CN202211623453.0A patent/CN115765291A/en active Pending
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