CN117318337A - Variable magnetic flux permanent magnet motor for flywheel energy storage - Google Patents
Variable magnetic flux permanent magnet motor for flywheel energy storage Download PDFInfo
- Publication number
- CN117318337A CN117318337A CN202311520088.5A CN202311520088A CN117318337A CN 117318337 A CN117318337 A CN 117318337A CN 202311520088 A CN202311520088 A CN 202311520088A CN 117318337 A CN117318337 A CN 117318337A
- Authority
- CN
- China
- Prior art keywords
- stator
- rotor
- permanent magnet
- energy storage
- flywheel energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 92
- 238000004146 energy storage Methods 0.000 title claims abstract description 44
- 230000004907 flux Effects 0.000 title claims abstract description 24
- 238000004804 winding Methods 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000005284 excitation Effects 0.000 claims abstract description 6
- 230000004323 axial length Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 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 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005242 forging Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- 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
- H02K1/17—Stator cores with permanent magnets
-
- 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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- 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
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/279—Magnets embedded in the magnetic core
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/04—Windings on magnets for additional excitation ; Windings and magnets for additional excitation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
- H02K21/222—Flywheel magnetos
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
- H02K21/227—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos having an annular armature coil
-
- 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
-
- 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
Abstract
The invention relates to the technical field of motors, and particularly discloses a variable magnetic flux permanent magnet motor for flywheel energy storage, which comprises an inner stator and an outer rotor, wherein the inner stator comprises a stator core, an armature winding, a stator magnetic yoke, a stator memory permanent magnet, a direct current magnetic regulating winding and a non-magnetic conduction shaft, wherein the stator core is symmetrically arranged; the invention adopts a mixed excitation mode of the rotor permanent magnet and the stator memory permanent magnet to enable an air gap magnetic field to be flexibly adjusted, and solves the problem that no-load standby electromagnetic loss is caused by unadjustable permanent magnet magnetic field of the traditional permanent magnet motor.
Description
Technical Field
The application relates to the technical field of motors, and particularly discloses a variable magnetic flux permanent magnet motor for flywheel energy storage.
Background
Flywheel energy storage systems are an energy storage device for electromechanical energy conversion. The system stores energy by adopting a physical method, and realizes the mutual conversion and storage between electric energy and mechanical kinetic energy of a flywheel running at high speed through an electric/power generation reciprocal bidirectional motor. The principle of the flywheel energy storage system is as follows: when the system is charged, external electric energy is converted by the power converter and then drives the motor to run, and the motor drives the flywheel rotor to accelerate to rotate until a set certain rotating speed is reached. During the acceleration rotation of the flywheel, the flywheel stores energy in the form of kinetic energy, and the energy storage process from electric energy to mechanical kinetic energy conversion is completed, and the energy is stored in the flywheel body rotating at a high speed. In the standby state, energy retention is achieved. When releasing energy, the motor is used as a generator, the flywheel rotating at high speed drags the motor to generate electricity, and the current and the voltage suitable for the load are output through the power converter, so that the energy releasing process from mechanical energy to electric energy is completed. In the process of releasing energy, the rotating speed of the flywheel is continuously reduced. And after the rotation speed of the flywheel is reduced to a certain limit value, continuously charging the system, and reciprocating.
Wherein, the motor is used as a key component of energy conversion, and the electromagnetic performance of the motor directly determines the performance of the energy storage system. Among various motor types, permanent magnet motors are widely used in flywheel energy storage systems due to their high power density, high efficiency, and fast response speed.
The energy storage energy of the flywheel energy storage system is limited by the rotational inertia of the rotor and the rotational speed of the rotor. Because the permanent magnetic field of the traditional permanent magnet motor is not adjustable, the permanent magnetic field which is not adjustable can continuously generate electromagnetic loss when the flywheel energy storage system is in a standby state. On the one hand, the idle standby loss increases the self-discharge rate of the system and reduces the energy conversion efficiency of the system. On the other hand, under vacuum state, the heat of the energy storage system is not easy to dissipate, the no-load standby loss can continuously generate heat, and the insulation of the motor can be directly burnt out when serious, so that the system is in fault, and the reliability of the system is reduced.
Accordingly, the inventors have provided a variable flux permanent magnet motor for flywheel energy storage to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the problem that the traditional permanent magnet motor causes no-load standby electromagnetic loss due to unadjustable permanent magnet field.
In order to achieve the above purpose, the basic scheme of the invention provides a variable magnetic flux permanent magnet motor for flywheel energy storage, which comprises an inner stator and an outer rotor, wherein the inner stator comprises symmetrically arranged stator iron cores, armature windings arranged on the stator iron cores, a stator magnetic yoke arranged in the stator iron cores, a stator memory permanent magnet arranged between the two stator iron cores, a direct current magnetic regulating winding arranged on the outer side of the stator memory permanent magnet and a non-magnetic shaft penetrating through the stator magnetic yoke;
the outer rotor is arranged outside the inner stator, and rotor permanent magnets are uniformly arranged on the inner surface of the outer rotor at intervals along the circumferential direction.
Further, the stator core is of a tooth groove-free structure and is formed by laminating silicon steel sheets along the axial direction of the outer rotor.
Further, the armature winding is a combination of one or more sets of symmetrical three-phase alternating current windings, and the armature winding adopts a Y-shaped, triangular or mixed connection mode of the two.
Further, the armature winding is connected to the outer surface of the stator core through casting epoxy resin, so that physical connection between the armature winding and the stator core is achieved.
Further, a first rotor tooth and a first rotor groove are uniformly arranged on one side of the inner surface of the outer rotor at intervals along the circumferential direction, a second rotor tooth and a second rotor groove are uniformly arranged on the other side of the inner surface of the outer rotor at intervals along the circumferential direction, and rotor permanent magnets are respectively arranged in the first rotor groove and the second rotor groove.
Further, the rotor permanent magnet has the same axial length as the first rotor groove and the second rotor groove.
Further, the first rotor teeth and the second rotor teeth are identical in structural feature and the axial length of the first rotor teeth is identical to the axial length of the stator core.
Further, the tooth axes of the first rotor tooth and the second rotor tooth are spatially separated by 0 or 180 electrical degrees.
Further, the outer rotor is forged from a monolithic steel material.
Further, when the flywheel energy storage system is in a charging or discharging state, the magnetic field generated by the stator memory permanent magnet is used for reinforcing a fundamental wave magnetic field in the air gap magnetic field; when the flywheel energy storage system is in an idle standby state, the rotor permanent magnet and the stator memory permanent magnet are subjected to mixed excitation to eliminate the alternating current component of the air gap magnetic field.
The principle and effect of this scheme lie in:
the invention adopts a mixed excitation mode of the rotor permanent magnet and the stator memory permanent magnet, so that the air gap magnetic field can be flexibly adjusted. On one hand, the direct-current magnetic regulating winding is controlled to regulate the size and the direction of the magnetic field generated by the stator memory permanent magnet on line, so that the electromagnetic loss of the flywheel energy storage system in the idle standby state can be greatly suppressed. On the other hand, when the system is in a load state, the stator memory permanent magnet field is used for enhancing the air gap field so as to improve the output performance of the motor and further improve the power density of the permanent magnet motor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall view of a variable flux permanent magnet motor for flywheel energy storage according to an embodiment of the present application;
fig. 2 shows a schematic structural exploded view of a variable flux permanent magnet motor for flywheel energy storage according to an embodiment of the present application;
fig. 3 shows a schematic diagram of a rotor structure of a variable flux permanent magnet motor for flywheel energy storage according to an embodiment of the present application;
fig. 4 is a front view and a schematic cross-sectional view of a variable flux permanent magnet motor for flywheel energy storage according to an embodiment of the present application, where (a) is a front view of the variable flux permanent magnet motor for flywheel energy storage, and (b) is a schematic cross-sectional view of A-A section of the variable flux permanent magnet motor for flywheel energy storage;
fig. 5 shows a schematic diagram of an air-gap magnetic field superposition process when the rotor permanent magnetic field and the stator memory permanent magnetic field in the variable magnetic flux permanent magnet motor for flywheel energy storage provided in the embodiment of the present application are opposite in direction, wherein B1 represents a single-side air-gap radial magnetic field waveform generated by the rotor permanent magnet, B2 represents a single-side air-gap radial magnetic field waveform generated by the stator memory permanent magnet, and B represents spatial superposition of B1 and B2;
fig. 6 shows an axial magnetic circuit schematic diagram when the direction of a rotor permanent magnetic field and the direction of a stator memory permanent magnetic field are the same in the variable magnetic flux permanent magnet motor for flywheel energy storage according to the embodiment of the application;
fig. 7 is a schematic diagram showing an air-gap field superposition process when the rotor permanent magnetic field and the stator memory permanent magnetic field are in the same direction in the variable magnetic flux permanent magnet motor for flywheel energy storage, wherein B1 is an exciting magnetic field radial component generated by the rotor permanent magnet, B2 is an exciting magnetic field radial component generated by the stator memory permanent magnet, and B is a combined magnetic field of the two.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.
Reference numerals in the drawings of the specification include: the stator yoke 1, the first stator yoke 1-1, the second stator yoke 1-2, the stator core 2, the first stator core 2-1, the second stator core 2-2, the armature winding 3, the rotor permanent magnet 4, the first rotor permanent magnet 4-1, the second rotor permanent magnet 4-2, the outer rotor 5, the first rotor tooth 5-11, the first rotor groove 5-12, the second rotor tooth 5-21, the second rotor groove 5-22, the stator memory permanent magnet 6, the direct current magnetic regulating winding 7, the non-magnetic conduction shaft 8, an axial magnetic circuit 9 generated by the rotor permanent magnet, an axial magnetic circuit 10 generated by the stator memory permanent magnet, and a closed radial magnetic circuit 11 formed by the rotor permanent magnet and the adjacent first rotor tooth or second rotor tooth.
A variable flux permanent magnet machine for flywheel energy storage, the embodiment of which is shown in figures 1 and 2: the stator comprises an inner stator and an outer rotor 5, and the whole is represented as an inner stator-outer rotor 5 topology, and the stator-outer rotor topology is specifically as follows:
the inner stator comprises a stator yoke 1, a stator core 2, an armature winding 3, a stator memory permanent magnet 6, a direct current magnetic regulating winding 7 and a non-magnetic shaft 8. The number of the stator yokes 1 is two, and the two stator yokes 1 have identical material properties and structural dimensions, so that the stator yokes 1-1 and the second stator yokes 1-2 are respectively named as a first stator yoke 1-1 and a second stator yoke 1-2, and the first stator yoke 1-1 and the second stator yoke 1-2 are integrally forged by adopting ferromagnetic materials with good magnetic conductivity for being convenient for the understanding of the person skilled in the art; the stator cores 2 are two and the two stator cores 2 have the same material properties and structural dimensions, so as to be convenient for the person skilled in the art to understand, the stator cores are named as a first stator core 2-1 and a second stator core 2-2 respectively, the first stator yoke 1-1 is arranged in the first stator core 2-1, and the second stator core 2-2 is arranged in the second stator yoke 1-2; the first stator iron core 2-1 and the second stator iron core 2-2 are formed by laminating silicon steel sheets along the axial direction of the outer rotor 5, in order to reduce the influence of stator tooth harmonic on an air gap magnetic field, the first stator iron core 2-1 and the second stator iron core 2-2 are of a tooth slot-free structure, the armature winding 3 is a short-distance three-phase double-layer alternating-current winding which is symmetrically distributed, the stator iron core 2 is formed by litz wire coils, the stator iron core 2 is in a Y-shaped connection mode, the stator iron core 2 and the stator iron core 2 are physically connected through epoxy resin pouring, the stator memory permanent magnet 6 is made of a memory permanent magnet material and is combined with the direct current magnetic regulating winding 7, the direct current magnetic regulating winding 7 is a concentrated winding coil and is positioned at the outer side of the stator memory permanent magnet 6, the direct current magnetic regulating winding 7 is positioned in the middle of the first stator yoke 1-1 and the second stator yoke 1-2, the non-magnetic shaft 8 is penetratingly assembled inside the stator yoke 1-1, the stator memory permanent magnet 6 and the second stator yoke 1-2, and the stator yoke 1, the stator iron core 2, the armature winding 3 and the direct current magnetic regulating winding 7 are coaxially assembled in space.
The outer rotor 5 is arranged outside the inner stator, as shown in fig. 1 to 3, tooth groove structures are uniformly distributed on two sides of the inner surface of the outer rotor 5, so that the outer rotor 5 forms structural characteristics including first rotor teeth 5-11, first rotor grooves 5-12, second rotor teeth 5-21 and second rotor grooves 5-22, wherein the first rotor teeth 5-11 and the first rotor grooves 5-12 are alternately arranged along the circumference, the second rotor teeth 5-21 and the second rotor grooves 5-22 are alternately arranged along the circumference, and the axes of the first rotor teeth 5-11 and the second rotor teeth 5-21 are different by 0 or 180 electric degrees, so that the energy storage density of the permanent magnet motor is improved, and the outer rotor 5 is formed by forging a whole steel material with good magnetic conductivity. As shown in fig. 1 and 2, the number of the rotor permanent magnets 4 is plural and are respectively installed in the first rotor slot 5-12 and the second rotor slot 5-22 by means of adhesive connection, for the convenience of understanding of those skilled in the art, the rotor permanent magnets 4 respectively named as first rotor permanent magnets 4-1 installed in the first rotor slot 5-12 and the rotor permanent magnets 4 installed in the second rotor slot 5-22 are second rotor permanent magnets 4-2, the magnetizing directions of the first rotor permanent magnets 4-1 and the second rotor permanent magnets 4-2 are opposite, the number of the first rotor permanent magnets 4-1 and the first rotor slot 5-12 are equal and have the same axial length, and the number of the second rotor permanent magnets 4-2 and the second rotor slot 5-22 are correspondingly equal and have the same axial length.
When the flywheel energy storage system is in a charged or discharged state, first, the rotor permanent magnet 4 forms a closed radial magnetic circuit 11 with its adjacent first rotor tooth 5-11 or second rotor tooth 5-21 as shown in fig. 4 (a); secondly, since the first rotor permanent magnet 4-1 and the second rotor permanent magnet 4-2 have opposite magnetizing fields, the rotor permanent magnet 4 generates a magnetic circuit closed in the axial direction, that is, an axial magnetic circuit 9 generated by the rotor permanent magnet, which is in a counterclockwise direction as shown in fig. 4 (b); the stator memory permanent magnet 6 generates a permanent magnetic field opposite to the magnetic circuit 9 under the action of the exciting magnetic field of the direct current magnetic regulating coil, namely an axial magnetic circuit 10 generated by the stator memory permanent magnet, and the direction is clockwise as shown in fig. 4 (b).
The magnetic field generated by the stator memory permanent magnet 6 is used for strengthening the fundamental wave magnetic field in the air gap magnetic field so as to achieve the purpose of improving the power density of the permanent magnet motor. The waveform of the air-gap field corresponding to fig. 4 is shown in fig. 5. In fig. 5, B1 represents a single-sided air gap radial magnetic field waveform generated by the rotor permanent magnet 4, B2 represents a single-sided air gap radial magnetic field waveform generated by the stator memory permanent magnet 6, and B represents spatial superposition of B1 and B2. As can be seen from fig. 5, the magnetic fields generated by the stator memory permanent magnet 6 and the rotor permanent magnet 4 can achieve the purpose of increasing the air gap fundamental wave magnetic field, thereby improving the output power of the permanent magnet motor.
The operating magnetic circuit of the permanent magnet motor of this embodiment is shown in fig. 6 when the flywheel energy storage system is in an idle standby state. In fig. 6, the axial magnetic circuit generated by the rotor permanent magnet 4 is in a counterclockwise direction as indicated by the magnetic circuit 9 marked in fig. 6, and the stator memorizes the axial magnetic circuit generated by the permanent magnet 6 in a counterclockwise direction as indicated by the magnetic circuit 10 marked in fig. 6.
The waveform of the no-load excitation magnetic field corresponding to fig. 6 is shown in fig. 7. Wherein, B1 is the radial component of the exciting magnetic field generated by the rotor permanent magnet 4, B2 is the radial component of the exciting magnetic field generated by the stator memory permanent magnet 6, and B is the combined magnetic field of the two. After the space superposition of B1 and B2, the first rotor teeth 5-11 and the first rotor permanent magnets 4-1 have the same polarity, and finally, the air gap magnetic field waveform only has a direct current component and no alternating component, thereby completely eliminating the no-load standby loss of the motor.
The invention adopts the topological structure of the inner stator and the outer rotor 5, thereby increasing the rotational inertia of the rotor of the permanent magnet motor. In addition, the outer rotor 5 is formed by forging a whole piece of high-strength alloy steel, so that the strength of the outer rotor 5 is increased, the limit rotation speed of the outer rotor 5 is increased, and the energy storage capacity of the system is expanded. When the permanent magnet motor is in an idle state, the effect that the alternating current component of the air gap magnetic field is completely eliminated is achieved by adopting the mode of mixed excitation of the rotor permanent magnet 4 and the stator memory permanent magnet 6, the idle standby loss of the permanent magnet motor is greatly restrained, the self-discharge rate of an energy storage system is reduced, and the energy conversion efficiency of the system is improved. When the permanent magnet motor is in a load state, the magnetic load of the permanent magnet motor is increased and the power density of the motor system is improved by superposing the stator memory permanent magnet magnetic field fundamental component and the rotor permanent magnet 4 magnetic field fundamental component.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The utility model provides a flywheel energy storage is with variable magnetic flux permanent magnet machine which characterized in that includes inner stator and external rotor:
the stator comprises stator cores, armature windings, stator yokes, stator memory permanent magnets, direct-current magnetic regulating windings and non-magnetic shafts, wherein the stator cores are symmetrically arranged, the armature windings are arranged on the stator cores, the stator yokes are arranged in the stator cores, the stator memory permanent magnets are arranged between the two stator cores, the direct-current magnetic regulating windings are arranged on the outer sides of the stator memory permanent magnets, and the non-magnetic shafts penetrate through the stator yokes;
the outer rotor is arranged outside the inner stator, and rotor permanent magnets are uniformly arranged on the inner surface of the outer rotor at intervals along the circumferential direction.
2. The variable magnetic flux permanent magnet motor for flywheel energy storage according to claim 1, wherein the stator core has a slotless structure and is made of silicon steel sheets laminated in an axial direction of the outer rotor.
3. The variable flux permanent magnet machine for flywheel energy storage of claim 2 wherein the armature winding is a three-phase ac winding, the armature winding being connected to the outer surface of the stator core by casting epoxy resin to effect a physical connection between the armature winding and the stator core.
4. A variable flux permanent magnet machine for flywheel energy storage according to any one of claims 1 to 3, wherein first rotor teeth and first rotor grooves are uniformly spaced apart in a circumferential direction on one side of an inner surface of the outer rotor, second rotor teeth and second rotor grooves are uniformly spaced apart in a circumferential direction on the other side of the inner surface of the outer rotor, and the rotor permanent magnets are respectively disposed in the first rotor grooves and the second rotor grooves.
5. A variable flux permanent magnet machine for flywheel energy storage as claimed in claim 4 wherein the rotor permanent magnets are of the same axial length as the first and second rotor slots.
6. A variable flux permanent magnet machine for flywheel energy storage as claimed in claim 5, wherein the first rotor teeth and the second rotor teeth are identical in structural characteristics and the axial length of the first rotor teeth is identical to the axial length of the stator core.
7. A variable flux permanent magnet machine for flywheel energy storage as claimed in any one of claims 5 or 6, wherein the outer rotor is forged from a monolithic piece of steel.
8. The variable flux permanent magnet machine for flywheel energy storage of claim 1 wherein the magnetic field generated by the stator memory permanent magnet is used to strengthen the fundamental magnetic field in the air gap field when the flywheel energy storage system is in a charged or discharged state; when the flywheel energy storage system is in an idle standby state, the rotor permanent magnet and the stator memory permanent magnet are subjected to mixed excitation to eliminate the alternating current component of the air gap magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311520088.5A CN117318337A (en) | 2023-11-15 | 2023-11-15 | Variable magnetic flux permanent magnet motor for flywheel energy storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311520088.5A CN117318337A (en) | 2023-11-15 | 2023-11-15 | Variable magnetic flux permanent magnet motor for flywheel energy storage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117318337A true CN117318337A (en) | 2023-12-29 |
Family
ID=89288559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311520088.5A Pending CN117318337A (en) | 2023-11-15 | 2023-11-15 | Variable magnetic flux permanent magnet motor for flywheel energy storage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117318337A (en) |
-
2023
- 2023-11-15 CN CN202311520088.5A patent/CN117318337A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10326322B2 (en) | Double-rotor flux-switching machine | |
| CN111900848B (en) | Three-winding axial magnetic field multiphase flywheel pulse generator system | |
| CN110601482B (en) | Axial magnetic field flywheel pulse synchronous generator system | |
| CN110460218B (en) | Flywheel pulse generator system controlled by stator magnetic circuit | |
| CN111969822B (en) | Mixed excitation multi-phase reluctance motor and power generation system | |
| CN103887908B (en) | A kind of brushless harmonic exitation synchronous motor | |
| CN111181262B (en) | Stator structure using built-in magnetic flux modulation ring of winding | |
| CN105680652A (en) | Hybrid magnetic circuit double-stator weak-magnetic speed multiplying solid rotor permanent magnet synchronous motor and method thereof | |
| CN110492665B (en) | Flywheel pulse synchronous generator system with embedded permanent magnet rotor | |
| US11482915B2 (en) | Radial-axial air gap three-phase disc-type transverse flux permanent magnet motor | |
| CN112865348B (en) | Linear-rotary low-speed cylinder generator | |
| CN105703583A (en) | Multi-stator hybrid magnetic circuit permanent magnet synchronous motor and method | |
| CN113067446A (en) | Double-modularization hybrid excitation flux switching motor | |
| CN105763009A (en) | Hybrid magnetic circuit low harmonic wave multi-stator flux-weakening speed extension permanent magnet synchronous motor, and method thereof | |
| CN105790470A (en) | Permanent magnet synchronous motor with two stators, composite rotor structure and radial and axial mixed magnetic paths and method thereof | |
| CN111953161B (en) | Double-winding axial magnetic field multiphase flywheel pulse generator system | |
| Anitha et al. | Design and analysis of axial flux permanent magnet machine for wind power applications | |
| CN205725388U (en) | A kind of multiple stators mixed magnetic circuit permagnetic synchronous motor | |
| Shah et al. | Comparative analysis of surface mounted and flux focusing type axial flux permanent magnet motor | |
| CN115347753A (en) | Double-stator motor based on excitation source synchronous and asynchronous double modulation | |
| CN117318337A (en) | Variable magnetic flux permanent magnet motor for flywheel energy storage | |
| Patil et al. | Design and Comparative Analysis of Axial Flux and Radial Flux Permanent Magnet Brushless DC Motor for a 2-Wheeler Electric Vehicle Application | |
| CN117239969B (en) | Outer rotor variable magnetic flux alternating pole permanent magnet synchronous motor | |
| CN109639035A (en) | Motor and the double-deck accumulated energy flywheel based on two-level rotor structure | |
| Yali et al. | Design of permanent magnet motor/generator using Halbach magnetized structure for the flywheel energy storage system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |