阅读说明：本技术 基于永磁体和内转子铁心偏心结构设计的正弦波转子 (Sine wave rotor designed based on permanent magnet and inner rotor iron core eccentric structure ) 是由 王志强 苏森 韩坤 陈胜林 于 2021-06-04 设计创作，主要内容包括：本发明涉及于发电机技术领域,具体公开了一种基于永磁体和内转子铁心偏心结构设计的正弦波转子,包括外转子铁心、偏心永磁体、内转子铁心和转子轴,多个偏心永磁体沿外转子铁心的径向内侧交替放置,且相邻两块偏心永磁体的充磁方向相反,偏心永磁体由圆弧边外廓,偏心圆弧内廓以及两侧边组成,内转子铁心的内廓为圆形、外廓由一组向外凸起的偏心圆弧组成,内转子铁心的径向外侧与偏心永磁体之间构成了环形气隙；本发明采用基于永磁体和内转子铁心偏心结构设计的正弦波转子,改善了储能飞轮发电机气隙磁密波形,减小气隙磁场中谐波含量,使气隙磁场接近正弦波,从而改善了发电机反电动势波形,降低了转矩脉动,提升了储能飞轮发电机性能。(The invention relates to the technical field of generators, and particularly discloses a sine wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor iron core, which comprises an outer rotor iron core, eccentric permanent magnets, an inner rotor iron core and a rotor shaft, wherein a plurality of eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, the magnetizing directions of two adjacent eccentric permanent magnets are opposite, each eccentric permanent magnet comprises an arc edge outline, an eccentric arc outline and two side edges, the inner outline of the inner rotor iron core is circular, the outline comprises a group of eccentric arcs protruding outwards, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the eccentric permanent magnets; the invention adopts the sine wave rotor designed based on the permanent magnet and the inner rotor core eccentric structure, improves the air gap flux density waveform of the energy storage flywheel generator, reduces the harmonic content in the air gap magnetic field, and enables the air gap magnetic field to be close to the sine wave, thereby improving the back electromotive force waveform of the generator, reducing the torque pulsation and improving the performance of the energy storage flywheel generator.)

1. A sine wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor iron core comprises an outer rotor iron core, an eccentric permanent magnet, an inner rotor iron core and a rotor shaft, the radial outer side of the outer rotor iron core is arranged at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is arranged at the inner end of the rotor shaft, it is characterized in that a plurality of eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, and the magnetizing directions of two adjacent eccentric permanent magnets are opposite, the eccentric permanent magnets are composed of an arc edge outline, an eccentric arc inner outline and two side edges, the inner contour of the inner rotor iron core is circular, the outer contour is composed of a group of eccentric arcs protruding outwards, the number of the eccentric arcs is the same as that of the eccentric permanent magnets, the positions of the eccentric arcs correspond to the eccentric permanent magnets one by one, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the eccentric permanent magnets;

the inner contour of the outer rotor iron core, the outer contour of the eccentric permanent magnet and the circular inner contour of the inner rotor iron core are concentrically arranged, the concentric point is the geometric center of the rotor, a connecting line of the middle point of the inner contour of the eccentric arc on the eccentric permanent magnet and the center of the circle of the eccentric arc passes through the geometric center of the rotor, two end points of the eccentric arc on the inner rotor iron core are on connecting lines of the two side edges of the corresponding eccentric permanent magnet and the geometric center of the rotor, and the center of the eccentric arc on the inner rotor iron core is on a connecting line of the middle point of the eccentric arc and the geometric center of the rotor.

2. According toThe sine wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core as claimed in claim 1, wherein the distance from the middle point of the eccentric arc on the inner rotor core to the geometric center isAnd satisfies the relation:whereinIs the radius of the inner profile of the outer rotor iron core,the distance between the middle point of the arc edge outline of the eccentric permanent magnet and the middle point of the eccentric arc inner outline is shown.

3. The sine wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core as claimed in claim 2, wherein the opening angle of the eccentric permanent magnets isSatisfy the relationWhereinThe radius of the inner contour of the eccentric arc on the eccentric permanent magnet is the number of pole pairsAnd satisfies the relation:

whereinThe radius of the inner profile of the outer rotor iron core.

4. The sine wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core according to claim 3, wherein the radius of the eccentric arc on the inner rotor core isAnd satisfies the relation:the number of the eccentric arcs on the inner rotor iron core isAnd satisfies the relation:。

5. the sine wave rotor designed based on the permanent magnets and the inner rotor core eccentric structure of claim 2, further comprising tile-shaped magnetic isolation blocks with the same number as the eccentric permanent magnets, wherein the magnetic isolation blocks are arranged between two adjacent eccentric permanent magnets, and two end points of the eccentric arc on the inner rotor core are on the connecting line of the geometric center and the middle points of the tile-shaped edges of the magnetic isolation blocks on the two sides of the corresponding eccentric permanent magnets.

6. The sine wave rotor based on permanent magnet and inner rotor core eccentric structure design of claim 5, characterized in that the tile-shaped outer diameter of the magnet isolation block isAnd satisfies the relation:the tile-shaped inner diameter isAnd satisfies the relation:whereinIs the radius of the inner profile of the outer rotor iron core,the distance between the middle point of the arc edge outline of the eccentric permanent magnet and the middle point of the inner outline of the eccentric arc is equal to the tile-shaped field angle of the magnetic isolation blockAnd satisfies the relation:opening angle of the eccentric permanent magnetSatisfy the relationWhereinIs the number of pole pairs.

7. The sine wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core as claimed in claim 6, wherein the radius of the inner profile of the eccentric arc on the eccentric permanent magnet isAnd satisfies the relation:whereinThe coefficient of the magnetic isolation block satisfies the relation:。

8. the sine wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core according to claim 8, wherein the radius of the eccentric arc on the inner rotor core isAnd satisfies the relation:

the number of the eccentric arcs on the inner rotor iron core isAnd satisfies the relation:。

9. the sine wave rotor designed based on the eccentric structures of the permanent magnet and the inner rotor core according to claim 4 or 8, wherein the distance between the center of the eccentric arc on the inner rotor core and the geometric center is an eccentric valueAnd satisfies the relation:。

10. the sine wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core according to claim 9, wherein the inner rotor core has a circular inner profile radius ofAnd satisfies the relation:。

Technical Field

The invention relates to the technical field of generators, and particularly discloses a sine wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor core.

Background

The traditional hollow cup type permanent magnet energy storage flywheel generator is applied to occasions with high rotating speed and needs high speed regulation precision, so that sine wave phase current driving control is provided, and the sine wave phase current needs to interact with sine wave counter electromotive force so as to reduce electromagnetic torque pulsation. In the traditional hollow cup type permanent magnet energy storage flywheel generator, the content of 3, 5 and 7 times of harmonic waves in the waveform of back electromotive force is large, so that the energy storage flywheel generator generates electromagnetic torque pulsation to influence the performance and efficiency of the energy storage flywheel generator. The main reason that the waveform harmonic content of the back electromotive force of the hollow cup type permanent magnet energy storage flywheel generator is high is that the sine type of the waveform of the air gap magnetic field of the energy storage flywheel generator is poor, and more odd harmonics are mixed, so that the air gap magnetic field of the energy storage flywheel generator is close to a trapezoid. The harmonic content of the back emf waveform is therefore large. Therefore, the optimization of the structure of the energy storage flywheel generator, the reduction of the harmonic content of the air gap magnetic field waveform and the approaching of the air gap magnetic field waveform to a sine wave are of great importance.

The prior granted national invention patent discloses a coreless energy storage flywheel generator structure without a stator core, wherein the coreless stator structure can be used in the design of a permanent magnet synchronous motor, so that an inner rotor core and an outer rotor core synchronously rotate along with an eccentric permanent magnet, and loss can not be generated in the cores; however, the distance between the middle point of the outline of the radial arc edge of the air gap and the middle point of the inner outline of the eccentric arc is uniform, so that the radial air gap magnetic resistance is consistent, the distribution of the air gap magnetic field is influenced, the harmonic content of the air gap magnetic field is larger, the sine performance is poorer, and the performance of the energy storage flywheel generator is influenced.

Disclosure of Invention

The invention aims to solve the technical problem that the harmonic content of a back electromotive force waveform generated by the traditional hollow cup type permanent magnet energy storage flywheel generator and the existing stator-core-free hollow cup energy storage flywheel generator structure is large, and the performance of the energy storage flywheel generator is influenced, and designs a sine wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor core.

The invention is realized by the following technical scheme:

a sine wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor iron core comprises an outer rotor iron core, an eccentric permanent magnet, an inner rotor iron core and a rotor shaft, the radial outer side of the outer rotor iron core is arranged at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is arranged at the inner end of the rotor shaft, the eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, and the magnetizing directions of two adjacent eccentric permanent magnets are opposite, the eccentric permanent magnets are composed of an arc edge outline, an eccentric arc inner outline and two side edges, the inner contour of the inner rotor iron core is circular, the outer contour is composed of a group of eccentric arcs protruding outwards, the number of the eccentric arcs is the same as that of the eccentric permanent magnets, the positions of the eccentric arcs correspond to the eccentric permanent magnets one by one, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the eccentric permanent magnets;

the inner contour of the outer rotor iron core, the outer contour of the eccentric permanent magnet and the circular inner contour of the inner rotor iron core are concentrically arranged, the concentric point is the geometric center of the rotor, a connecting line of the middle point of the inner contour of the eccentric arc on the eccentric permanent magnet and the center of the circle of the eccentric arc passes through the geometric center of the rotor, two end points of the eccentric arc on the inner rotor iron core are on connecting lines of the two side edges of the corresponding eccentric permanent magnet and the geometric center of the rotor, and the center of the eccentric arc on the inner rotor iron core is on a connecting line of the middle point of the eccentric arc and the geometric center of the rotor.

As a further arrangement of the above scheme, the distance from the midpoint of the eccentric arc on the inner rotor iron core to the geometric center isAnd satisfies the relation:whereinIs the radius of the inner profile of the outer rotor iron core,the distance between the middle point of the arc edge outline of the eccentric permanent magnet and the middle point of the eccentric arc inner outline is shown.

As a further arrangement of the above scheme, the opening angle of the eccentric permanent magnet isSatisfy the relationWhereinThe radius of the inner contour of the eccentric arc on the eccentric permanent magnet is the number of pole pairsAnd satisfies the relation:

whereinThe radius of the inner profile of the outer rotor iron core.

As a further arrangement of the above scheme, the radius of the eccentric arc on the inner rotor iron core isAnd satisfies the relation:the number of the eccentric arcs on the inner rotor iron core isAnd satisfies the relation:。

the magnetic separation block is arranged between two adjacent eccentric permanent magnets, and two end points of an eccentric arc on the iron core of the inner rotor are positioned on a connecting line of the geometric center and the middle point of the tile-shaped edge of the magnetic separation block on the two sides of the corresponding eccentric permanent magnet.

As a further arrangement of the above scheme, the tile-shaped outer diameter of the magnetic isolation block isAnd satisfies the relation:the tile-shaped inner diameter isAnd satisfies the relation:whereinIs the radius of the inner profile of the outer rotor iron core,the distance between the middle point of the arc edge outline of the eccentric permanent magnet and the middle point of the eccentric arc inner outline is shown; the tile-shaped opening angle of the magnetic isolation block isAnd satisfies the relation:opening angle of the eccentric permanent magnetSatisfy the relationWhereinIs the number of pole pairs.

As a further arrangement of the proposal, the radius of the inner contour of the eccentric arc on the eccentric permanent magnet isAnd satisfies the relation:whereinThe coefficient of the magnetic isolation block satisfies the relation:。

as a further arrangement of the above scheme, the radius of the eccentric arc on the inner rotor iron core isAnd satisfies the relation:

the number of the eccentric arcs on the inner rotor iron core isAnd satisfies the relation:。

as a further arrangement of the above scheme, a distance between a center of an eccentric arc on the inner rotor core and the geometric center is an eccentric valueAnd satisfies the relation:。

as a further arrangement of the above aspect, the inner rotor core has a circular inner contour radius ofAnd satisfies the relation:。

has the advantages that:

compared with the traditional coreless permanent magnet energy storage flywheel generator, the invention adopts the sine wave rotor designed based on the eccentric structure of the permanent magnet and the inner rotor core, the distance between the middle point of the radial air gap arc edge outline of the energy storage flywheel generator and the middle point of the eccentric arc outline is not uniform, the distance between the middle point of the radial air gap arc edge outline of the air gap and the middle point of the eccentric arc outline is more reasonable in change, the air gap magnetic density waveform of the energy storage flywheel generator is improved, the harmonic content in an air gap magnetic field is reduced, the air gap magnetic field is close to sine wave, the back electromotive force waveform of the coreless energy storage flywheel generator is improved, the torque pulsation is reduced, and the performance of the energy storage flywheel generator is improved. Meanwhile, the arrangement of the magnetic isolating blocks can effectively prevent the generation of interpolar magnetic leakage, and the performance of the generator is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a partial schematic structural view of embodiment 1 of the present invention;

FIG. 3 is a schematic diagram showing the comparison between the rotor structure of the square-wave energy-storage flywheel generator of embodiment 1 of the present invention and the air gap field of the conventional hollow cup type energy-storage flywheel generator;

FIG. 4 is a schematic structural view of example 2 of the present invention;

FIG. 5 is a partial structural view of embodiment 2 of the present invention;

fig. 6 is a schematic diagram of the comparison between the square wave flywheel generator rotor structure and the conventional hollow cup type flywheel generator air gap field in embodiment 2 of the present invention.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "mounted," "disposed," "provided," "connected," "sleeved," "laid," and the like are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will now be described in detail with reference to the accompanying figures 1-6, in conjunction with an illustrative embodiment.

Example 1

Embodiment 1 discloses a sine wave rotor based on permanent magnet and inner rotor core eccentric structure design for a permanent magnet synchronous energy storage flywheel generator. Referring to fig. 1 and 2, which include an outer rotor core 1, an eccentric permanent magnet 2, an inner rotor core 3, and a rotor shaft 4, the outer rotor core 1 and the inner rotor core 3 are both fixedly coupled to the rotor shaft 4 such that the outer rotor core 1 and the inner rotor core 3 rotate together with the rotor shaft 4. When the permanent magnet generator is arranged, the radial outer side of the outer rotor iron core 1 is arranged on the rotor shaft 4, the eccentric permanent magnets 2 are alternately arranged along the radial inner side of the outer rotor iron core 1, the magnetizing directions of two adjacent eccentric permanent magnets 2 are opposite, and the number of the eccentric permanent magnets 2 is determined according to the pole pair number of the generator. The radial inner side of an inner rotor iron core 3 is arranged on a rotor shaft 4, an annular air gap of the energy storage flywheel generator is formed between the radial outer side of the inner rotor iron core 3 and an eccentric permanent magnet 2, a hollow cup stator is arranged in the air gap and fixed on a machine shell, the structure of the hollow cup stator is consistent with that of the existing hollow cup energy storage flywheel generator, and the structure is not shown and described here. The magnetic flux generated by the eccentric permanent magnet 2 forms a closed loop through the outer rotor core 1 and the eccentric inner rotor core 3 and an air gap therebetween.

In the embodiment, the outline of the outer rotor core 1, the outline of the eccentric permanent magnet 2 and the outline of the inner rotor core 3 are concentrically arranged, and the concentric point is used for storing the geometric center of the flywheel generator, and the point is also the geometric center of the rotor. Wherein, the outer rotor iron core 1 is ring-shaped, and the inner diameter thereofAnd determining according to the actual working requirement of the energy storage flywheel generator. The eccentric permanent magnet 2 consists of an arc edge outline, an eccentric arc inner outline and two side edges, a connecting line of the middle point of the eccentric arc inner outline on the eccentric permanent magnet 2 and the center of the circle of the eccentric permanent magnet passes through the geometric center of the energy storage flywheel generator, and the distance between the middle point of the arc edge outline on the eccentric permanent magnet 2 and the middle point of the eccentric arc inner outline is determined according to the actual working requirement of the energy storage flywheel generator. The inner contour of the inner rotor iron core 3 is circular, the outer contour is formed by a group of eccentric arcs protruding outwards, the number of the eccentric arcs on the inner rotor iron core 3 is consistent with that of the eccentric permanent magnets 2, and the positions of the eccentric arcs correspond to the eccentric permanent magnets 2 one by one. The two end points of the eccentric arc on the inner rotor iron core 3 are in pairTwo sides of the eccentric permanent magnet 2 are connected with the geometric center of the energy storage flywheel generator, and the center of an eccentric arc on the inner rotor iron core 3 is connected with the geometric center of the energy storage flywheel generator at the center of the eccentric arc.

As shown in fig. 2, point O in the figure is the geometric center of the energy storage flywheel generator; h₁The point is the midpoint of the profile of the eccentric permanent magnet 2, H₂The point is the middle point of the inner contour of the eccentric arc on the eccentric permanent magnet 2, O₂As the center of the circle; A. b, two points are two end points of an eccentric arc on the inner rotor iron core, O' point is the center of the eccentric arc on the inner rotor iron core, and H point is the middle point of the eccentric arc on the inner rotor iron core; C. d is the end points of the two sides of the eccentric permanent magnet 2.

Wherein, the central point H is the outline central point of the arc edge of the eccentric permanent magnet 2₁To the center point H of the inner contour of the eccentric arc₂The distance between the two adjacent electrodes is less than the total distance,the radius of the inner contour of the eccentric arc on the eccentric permanent magnet 2;which is the radius of the inner profile of the outer rotor core 1,the radius of an eccentric arc on an inner rotor iron core,the distance from the middle point of the eccentric arc on the inner rotor iron core to the geometric center of the energy storage flywheel generator is represented;the distance eccentricity value between the center of an eccentric arc on the inner rotor iron core and the geometric center of the energy storage flywheel generator is obtained;the radius of the inner contour of the inner rotor iron core 3;is the opening angle of the eccentric permanent magnet 2.

Two end points A, B of the eccentric arc on the inner rotor iron core are on the connecting line of the two sides of the corresponding eccentric permanent magnet 2 and the geometric center O of the energy storage flywheel generator, namely A is on a line segment OC and B is on a line segment OD. The center of the eccentric arc on the inner rotor iron core is on the connecting line of the center of the eccentric arc and the geometric center of the energy storage flywheel generator, namely the point O' is positioned on the line segment OH, the connecting line of the center of the inner outline of the eccentric arc on the eccentric permanent magnet 2 and the center of the eccentric arc passes through the geometric center of the energy storage flywheel generator, namely the point O is positioned on the line segment O₂H₂The above.

The following relevant parameters are satisfied when designing a sine wave rotor designed based on a permanent magnet and an inner rotor core eccentric structure:

1) the opening angle of the eccentric permanent magnet isSatisfy the relationWhereinThe number of pole pairs of the energy storage flywheel generator is set;

2) the radius of the inner contour of the eccentric arc on the eccentric permanent magnet isAnd satisfies the relation:

whereinIs the radius of the inner profile of the outer rotor iron core,is an eccentric permanent magnetThe distance between the middle point of the outline of the arc edge of the body and the middle point of the inner outline of the eccentric arc;

3) the number of the eccentric arcs on the inner rotor iron core 3 isAnd satisfies the relation:；

4) the distance from the middle point of the eccentric arc on the inner rotor iron core 3 to the geometric center of the energy storage flywheel generator isAnd satisfies the relation:；

5) the radius of the eccentric arc on the inner rotor iron core 3 isAnd satisfies the relation:

；

6) the distance between the center of an eccentric arc on the inner rotor iron core 3 and the geometric center of the energy storage flywheel generator is an eccentric valueAnd satisfies the relation:；

7) the inner rotor core 3 has a circular contour radius ofAnd satisfies the relation:。

this example1 is defined by an outer rotor inner profile radiusIs 65mm, and the distance between the middle point of the outer contour of the arc edge of the eccentric permanent magnet and the middle point of the inner contour of the eccentric arc3.5mm, number of pole pairsFor example, the rotor structure of the permanent magnet synchronous energy storage flywheel generator based on the permanent magnet and inner rotor core eccentric structure design of 4 is designed for the eccentric permanent magnet and the eccentric inner rotor core:

is composed ofDetermining the opening angle of the eccentric permanent magnet 2Is composed of (45°)；

Is composed ofThe radius of the inner contour of the eccentric arc on the eccentric permanent magnet 2 is obtainedSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably 140 mm;

is composed ofObtaining the middle point of the eccentric arc on the inner rotor iron core to the geometric center of the energy storage flywheel generatorDistance of heartSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,the preferred value is 55 mm;

is composed ofThe radius of the eccentric arc on the inner rotor iron core is obtainedSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably 45 mm;

is composed ofObtaining the distance eccentricity value between the center of the eccentric arc on the inner rotor iron core and the geometric center of the energy storage flywheel generatorIs 9 mm;

is composed ofThe circular inner contour radius of the inner rotor iron core 4 is obtainedSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably 20 mm.

The traditional hollow cup type energy storage flywheel generator is taken as a comparative example, and the parameters of the energy storage flywheel generator are that the inner diameter of an outer rotor is 65mm, and the number of pole pairsThe outer diameter of the inner rotor is 55mm, the inner diameter of the inner rotor is 20mm, the outer diameter of the permanent magnet is 65mm, the thickness is 3.5mm, and the inner diameter is 61.5 mm.

Compared with the traditional hollow cup type energy storage flywheel generator, the rotor structure air gap magnetic field of the permanent magnet synchronous hollow cup energy storage flywheel generator in the embodiment is closer to a sine wave. Referring to the attached figure 3, the sine of the air-gap magnetic field waveform is evaluated by introducing a Total Harmonic Distortion (THD), the air-gap magnetic field waveform is subjected to Fourier decomposition transformation to obtain the amplitude of each order of harmonic, and the formula is shownTHD is calculated, the smaller the THD, the better the sinusoid. The air gap magnetic field waveform THD of the traditional hollow cup type energy storage flywheel generator is obtained through calculation, the air gap magnetic field waveform THD of the rotor structure of the permanent magnet synchronous energy storage flywheel generator in the embodiment is 15.2%, namely the THD of the rotor structure of the permanent magnet synchronous energy storage flywheel generator designed based on the inner rotor core eccentricity and permanent magnet eccentricity structure is reduced by 59.0%.

Example 2

The embodiment 2 discloses a rotor based on a permanent magnet and an inner rotor core eccentric structure and used in a sine wave energy storage flywheel generator. Referring to fig. 4 and 5, which include an outer rotor core 1, an eccentric permanent magnet 2, a magnet-separating block 5, an inner rotor core 3, and a rotor shaft 4, the outer rotor core 1 and the inner rotor core 3 are both fixedly connected to the rotor shaft 4, so that the outer rotor core 1 and the inner rotor core 3 rotate together with the rotor shaft 4.

When the permanent magnet generator is arranged, the radial outer side of the outer rotor iron core 1 is arranged on the rotor shaft 4, the eccentric permanent magnets 2 are alternately arranged along the radial inner side of the outer rotor iron core 1, the magnetizing directions of two adjacent eccentric permanent magnets 2 are opposite, and the number of the eccentric permanent magnets 2 is determined according to the pole pair number of the generator. The tile-shaped magnetic isolation blocks 5 are arranged between two adjacent eccentric permanent magnets 2, and the number of the magnetic isolation blocks is the same as that of the eccentric permanent magnets 2. The radial inner side of an inner rotor iron core 3 is arranged on a rotor shaft 4, an annular air gap of the sine wave energy storage flywheel is formed between the radial outer side of the inner rotor iron core 3 and an eccentric permanent magnet 2, a hollow cup stator is arranged in the air gap and fixed on a machine shell, the structure of the hollow cup stator is consistent with that of a stator of an existing sine wave energy storage flywheel generator, and the structure is not shown and described here. The magnetic flux generated by the eccentric permanent magnet 2 forms a closed loop through the outer rotor core 1 and the eccentric inner rotor core 3 and an air gap therebetween.

In the embodiment, the outline of the outer rotor core 1, the outline of the eccentric permanent magnet 2 and the outline of the inner rotor core 3 are concentrically arranged, and the concentric point is used for storing the geometric center of the flywheel generator, and the point is also the geometric center of the rotor. Wherein, the outer rotor iron core 1 is ring-shaped, and the inner diameter thereofThe method is determined according to the actual working requirement of the sine wave energy storage flywheel generator. The eccentric permanent magnet 2 consists of an arc edge outline, an eccentric arc inner outline and two side edges, a connecting line of the middle point of the eccentric arc inner outline on the eccentric permanent magnet 2 and the center of the circle passes through the geometric center of the sine wave energy storage flywheel generator, and the distance between the middle point of the arc edge outline on the eccentric permanent magnet 2 and the middle point of the eccentric arc inner outline is determined according to the actual working requirement of the sine wave energy storage flywheel generator. The inner contour of the inner rotor iron core 3 is circular, the outer contour is formed by a group of eccentric arcs protruding outwards, the number of the eccentric arcs on the inner rotor iron core 3 is consistent with that of the eccentric permanent magnets 2, and the positions of the eccentric arcs correspond to the eccentric permanent magnets 2 one by one. Two end points of an eccentric arc on the inner rotor iron core 3 are positioned on the connecting line of the center of the tile-shaped edges of the magnetic separating blocks 5 at two sides of the corresponding eccentric permanent magnet 2 and the geometric center of the sine wave energy storage flywheel generator, and the center of the eccentric arc on the inner rotor iron core 3 is positioned on the connecting line of the center of the eccentric arc and the geometric center of the sine wave energy storage flywheel generator.

As shown in figure 5 of the drawings,in the figure, the point O is the geometric center of the sine wave energy storage flywheel generator; h₁The point is the midpoint of the profile of the eccentric permanent magnet 2, H₂The point is the middle point of the inner contour of the eccentric arc on the eccentric permanent magnet 2, O₂As the center of the circle; A. b, two points are two end points of an eccentric arc on the inner rotor iron core, O' point is the center of the eccentric arc on the inner rotor iron core, and H point is the middle point of the eccentric arc on the inner rotor iron core; C. d is the middle point of the 5-watt-shaped edge of the magnetic isolation blocks at the two sides of the eccentric permanent magnet 2.

Wherein the content of the first and second substances,is the arc edge outline midpoint H of the eccentric permanent magnet 2₁To the center point H of the inner contour of the eccentric arc₂The distance between them;the radius of the inner contour of the eccentric arc on the eccentric permanent magnet 2 is formed;the radius of the inner profile of the outer rotor iron core 1;the radius of an eccentric arc on an inner rotor iron core,the distance from the middle point of the eccentric arc on the inner rotor iron core to the geometric center of the rotor,the distance eccentricity value between the center of an eccentric arc on the inner rotor iron core and the geometric center of the rotor,the radius of the inner contour of the inner rotor iron core 3;is the inner diameter of the tile-shaped magnetic isolating block 5,the outer diameter of the tube is the same as the diameter of the tube,is its opening angle;is the opening angle of the eccentric permanent magnet 2.

Two end points A, B of the eccentric arc on the inner rotor iron core are on the connecting line of the middle point C, D of the tile-shaped edge of the magnetic isolating block 5 at two sides of the corresponding eccentric permanent magnet 2 and the geometric center O of the rotor, namely A is on the line segment OC and B is on the line segment OD. The center of the eccentric arc on the inner rotor iron core is on the connecting line of the midpoint and the geometric center of the rotor, namely the O' point is positioned on the line segment OH. The connecting line of the middle point of the inner outline of the eccentric arc on the eccentric permanent magnet 2 and the center of the circle passes through the geometric center of the rotor, namely the point O is positioned on the line segment O₂H₂The above.

The following relevant parameters are satisfied when designing a sine wave rotor designed based on a permanent magnet and an inner rotor core eccentric structure:

1) the tile-shaped outer diameter of the magnetic isolation block isAnd satisfies the relation:the tile-shaped inner diameter isAnd satisfies the relation:whereinIs the radius of the inner profile of the outer rotor iron core,the distance between the middle point of the arc edge outline of the eccentric permanent magnet and the middle point of the inner outline of the eccentric arc is that the tile-shaped opening angle isAnd satisfies the relation:(ii) a Opening angle of eccentric permanent magnetSatisfy the relationWhereinThe number of pole pairs of the energy storage flywheel generator is.

2) The radius of the eccentric arc on the inner rotor iron core isAnd satisfies the relation:

whereinThe coefficient of the magnetic isolation block satisfies the relation:。

3) the number of the eccentric arcs on the inner rotor iron core isAnd satisfies the relation:。

4) inner partThe distance from the middle point of the eccentric arc on the rotor core to the geometric center isAnd satisfies the relation:。

5) the radius of the eccentric arc on the inner rotor iron core isAnd satisfies the relation:

。

6) the distance between the center of an eccentric arc on the inner rotor iron core and the geometric center is an eccentric valueAnd satisfies the relation:。

7) the inner rotor core has a circular inner profile radius ofAnd satisfies the relation:。

this embodiment 2 uses an outer rotor inner profile radiusIs 95mm, and the distance between the middle point of the outer contour of the arc edge of the eccentric permanent magnet and the middle point of the inner contour of the eccentric arc6.5mm, number of pole pairsFor example, the rotor structure of the sine wave energy storage flywheel generator based on the inner rotor core eccentricity and permanent magnet eccentricity structure design of 4 is designed for a magnetic separation block, an eccentric permanent magnet and an eccentric inner rotor core:

is composed ofTo obtain the tile-shaped outer diameter of the magnetic isolating blockIs 95mm, is represented by the formulaTo obtain a tile-shaped inner diameter89.475 mm;

is composed ofDewar tile type opening angleSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably takes on a value of；

Is composed ofCalculating the tile-shaped opening angle of the eccentric permanent magnet 2Is composed of (42.5°)；

Is composed ofObtaining the radius of the inner contour of the eccentric arc on the eccentric permanent magnetSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,the preferred value is 150 mm;

is composed ofObtaining the distance from the middle point of the eccentric arc on the inner rotor iron core to the geometric centerSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably 82 mm;

is composed ofThe radius of the eccentric arc on the inner rotor iron core is obtainedSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,the preferred value is 70 mm;

is composed ofObtaining the distance eccentricity value between the center of the eccentric arc on the inner rotor iron core and the geometric centerIs 12 mm;

is composed ofObtaining the circular inner contour radius of the inner rotor iron coreSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably 35 mm.

The traditional hollow cup type energy storage flywheel generator is taken as a comparative example, and the parameters of the energy storage flywheel generator are that the inner diameter of an outer rotor is 95mm, and the number of pole pairsThe outer diameter of the inner rotor is 82mm, the inner diameter of the inner rotor is 35mm, the outer diameter of the permanent magnet is 95mm, the thickness is 6.5mm, and the inner diameter is 88.5 mm.

Compared with the traditional hollow cup type energy storage flywheel generator, the air gap magnetic field of the rotor structure of the sine hollow cup type energy storage flywheel generator is closer to a sine wave. Referring to the attached figure 6, the sine of the air-gap magnetic field waveform is evaluated by introducing a Total Harmonic Distortion (THD), the air-gap magnetic field waveform is subjected to Fourier decomposition transformation to obtain the amplitude of each order of harmonic, and the formula is shownTHD is calculated, the smaller the THD, the better the sinusoid. Respectively calculated above to obtainThe air gap magnetic field waveform THD of the conventional hollow cup type energy storage flywheel generator is 36.9%, which is 13.4% of the air gap magnetic field waveform THD of the rotor structure of the sinusoidal energy storage flywheel generator of this embodiment 2, that is, the rotor structure THD of the sinusoidal energy storage flywheel generator designed based on the inner rotor core eccentricity and permanent magnet eccentricity structure is reduced by 63.7%.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.