阅读说明：本技术 基于内转子铁心偏心结构设计的方波转子 (Square wave rotor designed based on inner rotor iron core eccentric structure ) 是由 苏森 韩坤 王志强 陈胜林 于 2021-06-04 设计创作，主要内容包括：本发明涉及于电机或发电机技术领域,具体公开了一种基于内转子铁心偏心结构设计的方波转子,包括外转子铁心、永磁体、隔磁块、内转子铁心和转子轴,外转子铁心的径向外侧安装在转子轴的外端,内转子铁心的径向内侧安装在转子轴的内端,多个呈瓦片状永磁体沿外转子铁心的径向内侧交替放置,呈瓦片状隔磁块置于相邻两块永磁体之间,内转子铁心的内廓为圆形、外廓由一组偏心圆弧构成,偏心圆弧的个数与永磁体的个数相同,内转子铁心的径向外侧与永磁体之间构成了环形气隙；本发明采用了基于内转子铁心偏心结构设计后的转子,使气隙磁场接近方波,从而改善了空心杯型储能飞轮发电机反电动势波形,降低了转矩脉动,提升了发电机的性能。(The invention relates to the technical field of motors or generators, and particularly discloses a square wave rotor designed based on an eccentric structure of an inner rotor iron core, which comprises the outer rotor iron core, permanent magnets, magnetic isolation blocks, the inner rotor iron core and a rotor shaft, wherein 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, a plurality of tile-shaped permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, the tile-shaped magnetic isolation blocks are arranged between two adjacent permanent magnets, the inner contour of the inner rotor iron core is circular, the outer contour is formed by a group of eccentric arcs, the number of the eccentric arcs is the same as that of the permanent magnets, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the permanent magnets; the invention adopts the rotor designed based on the eccentric structure of the inner rotor core to enable the air gap magnetic field to be close to square waves, thereby improving the counter electromotive force waveform of the hollow cup type energy storage flywheel generator, reducing the torque pulsation and improving the performance of the generator.)

1. A square wave rotor designed based on an eccentric structure of an inner rotor iron core comprises the outer rotor iron core, a permanent magnet, a magnetic isolation block, the 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 tile-shaped permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, the magnetizing directions of the two adjacent permanent magnets are opposite, the tile-shaped magnetism isolating block is arranged between the two adjacent permanent magnets, the number of the magnetic isolation blocks is the same as that of the permanent magnets, the inner contour of the inner rotor iron core is circular, the outer contour of the inner rotor iron core is formed by a group of eccentric arcs, the number of the eccentric arcs is the same as that of the permanent magnets, the positions of the eccentric arcs correspond to the 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 permanent magnets;

the inner outline of the outer rotor iron core, the inner outline of the permanent magnet and the circular outline of the inner rotor iron core are concentrically arranged, the concentric point is the geometric center of the rotor, two end points of the eccentric arc are located on the connecting line of the middle points of the tile-shaped edges of the magnetic separation blocks on the two sides of the corresponding permanent magnet and the geometric center, and the connecting line of the middle points of the eccentric arc and the circle center of the eccentric arc passes through the geometric center.

2. The square-wave rotor designed based on the eccentric structure of the inner rotor core as claimed in claim 1, wherein the magnetic isolating block has a tile-shaped outer diameter ofAnd satisfies the relation:the tile-shaped inner diameter of the magnetic isolating block satisfies the relation:whereinThe radius of the inner profile of the outer rotor iron core is the thickness of the permanent magnet.

3. The square-wave rotor designed based on the eccentric structure of the inner rotor core as claimed in claim 2, wherein the tile-shaped opening angle of the magnet isolating block isAnd satisfies the relation:the tile-shaped opening angle of the permanent magnetSatisfy the relationWhereinIs the number of pole pairs.

4. The square-wave rotor designed based on the eccentric structure of the inner rotor core as claimed in claim 3, wherein the distances from the two end points of the eccentric arc to the geometric center satisfy the following relation:。

5. the square-wave rotor designed based on the eccentric structure of the inner rotor core as claimed in claim 4, wherein the distance between the center of the eccentric arc and the geometric center is an eccentric valueAnd satisfies the relation:

wherein, the coefficient of the magnetic isolation block satisfies the relation:。

6. the square-wave rotor designed based on the eccentric structure of the inner rotor core as recited in claim 5, wherein the radius of the eccentric arc is such that the following relation is satisfied:。

7. the square-wave rotor designed based on the eccentric structure of the inner rotor core as claimed in claim 1, wherein the number of the eccentric arcs on the inner rotor core is as follows, and satisfies the relation: wherein, the number of pole pairs is.

Technical Field

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

Background

The traditional square wave energy storage flywheel generator is mostly applied to low-rotating-speed and high-load occasions and is driven and controlled by square wave phase current, and the square wave phase current needs to interact with the opposite electromotive force of a square wave so as to reduce electromagnetic torque pulsation. The traditional hollow cup type square wave energy storage flywheel generator has larger difference between the waveform of back electromotive force and the square wave, so that the energy storage flywheel generator generates electromagnetic torque pulsation to influence the performance and efficiency of the energy storage flywheel generator. Therefore, the optimization of the structure of the energy storage flywheel generator and the reduction of the harmonic content of the air gap magnetic field waveform are of great importance to enable the air gap magnetic field waveform to be close to a square wave.

The prior patent of invention with application number 200410101898 discloses a brushless dc motor without a stator core, wherein a hollow cup stator structure can be used in the design of the brushless dc motor, so that an inner eccentric outer rotor core rotates synchronously with a permanent magnet, and no loss is generated in the core, and the hollow cup stator enables the stator to be a structure without tooth grooves, and can eliminate the cogging torque and the tooth harmonic. However, the radial thickness of the air gap of the direct current motor is uniform, so that the magnetic resistance of the radial air gap is consistent, the distribution of the air gap magnetic field is influenced, and the difference between the air gap magnetic field waveform and the square wave is large; in addition, because the permanent magnets are in direct contact with each other, interpolar magnetic leakage is generated, and the performance of the energy storage flywheel generator is influenced. Therefore, aiming at the structural design defects of the existing brushless direct current motor without the stator core, the square wave rotor designed based on the eccentric structure of the inner rotor core is designed to be used in the generator so as to reduce the waveform harmonic content of the air gap magnetic field and improve the performance of the generator.

Disclosure of Invention

The invention solves the technical problem that aiming at the structural design defects of the existing brushless direct current motor without a stator core, the invention designs a square wave rotor designed based on an eccentric structure of an inner rotor core to be used in a generator so as to reduce the waveform harmonic content of an air gap magnetic field and improve the performance of the motor.

The invention is realized by the following technical scheme:

a square wave rotor designed based on an eccentric structure of an inner rotor iron core comprises the outer rotor iron core, a permanent magnet, a magnetic isolation block, the 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 tile-shaped permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, the magnetizing directions of the two adjacent permanent magnets are opposite, the tile-shaped magnetism isolating block is arranged between the two adjacent permanent magnets, the number of the magnetic isolation blocks is the same as that of the permanent magnets, the inner contour of the inner rotor iron core is circular, the outer contour of the inner rotor iron core is formed by a group of eccentric arcs, the number of the eccentric arcs is the same as that of the permanent magnets, the positions of the eccentric arcs correspond to the 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 permanent magnets;

the inner outline of the outer rotor iron core, the inner outline of the permanent magnet and the circular outline of the inner rotor iron core are concentrically arranged, the concentric point is the geometric center of the rotor, two end points of the eccentric arc are located on the connecting line of the middle points of the tile-shaped edges of the magnetic separation blocks on the two sides of the corresponding permanent magnet and the geometric center, and the connecting line of the middle points of the eccentric arc and the circle center of the eccentric arc passes through the geometric center.

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 of the magnetic isolation block isAnd satisfies the relation:whereinIs an outer rotor iron coreThe radius of the inner contour is such that,is the thickness of the permanent magnet.

As a further arrangement of the above scheme, the tile-shaped opening angle of the magnetic isolation block isAnd satisfies the relation:the tile-shaped opening angle of the permanent magnetSatisfy the relationWhereinIs the number of pole pairs.

As a further configuration of the above solution, the distance from the two end points of the eccentric arc to the geometric center isAnd satisfies the relation:。

as a further configuration of the above solution, the distance between the center of the eccentric arc and the geometric center is an eccentric valueAnd satisfies the relation:

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

as a further arrangement of the above solution, the radius of the eccentric arc isAnd satisfies the relation:。

as a further arrangement of the above scheme, the number of the eccentric arcs on the inner rotor core isAnd satisfies the relation:whereinIs the number of pole pairs.

Has the advantages that:

compared with the traditional coreless permanent magnet energy storage flywheel generator, the invention adopts the rotor designed based on the eccentric structure of the inner rotor core, the structural design of the square wave rotor ensures that the thickness edge of the radial air gap of the energy storage flywheel generator is not uniform, the radial thickness change of the air gap is more reasonable, the air gap magnetic density waveform of the energy storage flywheel generator is improved, and the air gap magnetic field is close to the square wave, thereby improving the back electromotive force waveform of the coreless energy storage flywheel generator and reducing the torque pulsation. In addition, the arrangement of the magnetic isolating blocks in the square-wave rotor avoids the generation of interpolar magnetic flux leakage caused by direct contact between permanent magnets, so that the performance of the motor 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 a comparison between a rotor structure of a square wave energy storage flywheel generator designed based on an eccentric structure of an inner rotor core and an air gap field of a conventional hollow cup type energy storage flywheel generator in embodiment 1 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 be described in detail with reference to the accompanying drawings 1-3, in conjunction with the embodiments.

Example 1

This embodiment 1 discloses a method for square wave energy storageThe square wave rotor is designed based on an inner rotor core eccentric structure in a flywheel generator. Referring to fig. 1 and 2, the main body components include an outer rotor core 1, a permanent magnet 2, a magnetism isolating block 3, an inner rotor core 4 and a rotor shaft 5, and the outer rotor core 1 and the inner rotor core 4 are both fixedly connected to the rotor shaft 5, so that the outer rotor core 1 and the inner rotor core 4 rotate together with the rotor shaft 5. When installed, the radially outer side of the outer rotor core 1 is attached to the outer end of the rotor shaft 5, and the radially inner side of the inner rotor core 4 is attached to the inner end of the rotor shaft 5. In the embodiment, the permanent magnet 2 and the magnetic isolation block 3 are both tile-shaped, and the thickness of the permanent magnet 2 isThe number of the square wave energy storage flywheel generators is determined according to the actual working requirement of the square wave energy storage flywheel generators and the number of the square wave energy storage flywheel generators is determined according to the number of pole pairs. A plurality of tile-shaped permanent magnets 2 are alternately arranged along the radial inner side of the outer rotor iron core 1, and the magnetizing directions of two adjacent permanent magnets 2 are opposite. The tile-shaped magnetic isolation blocks 2 are arranged between two adjacent permanent magnets 2, and the number of the magnetic isolation blocks is the same as that of the permanent magnets 2.

The outer rotor iron core 1 is annular and has an inner diameterAnd determining according to the actual working requirement of the square wave energy storage flywheel generator. The inner contour of the inner rotor iron core 4 is circular, the outer contour thereof is composed of a group of eccentric arcs, the number of the eccentric arcs is consistent with that of the permanent magnets 2, and the positions of the eccentric arcs correspond to the permanent magnets 2 one by one. An annular air gap of the square wave energy storage flywheel generator is formed between the radial outer side of the inner rotor iron core 4 and the permanent magnet 2, a hollow cup stator (not shown in the figure) is arranged in the air gap and fixed on the shell, and the structure of the hollow cup stator is consistent with that of the existing stator. The magnetic flux generated by the permanent magnet 2 forms a closed loop through the outer rotor core 1 and the inner rotor core 4 and an air gap therebetween.

The inner outline of the outer rotor iron core 1, the inner outline of the permanent magnet 2 and the circular outline of the inner rotor iron core 4 are concentrically arranged, and the concentric point is used as the geometric center of the square wave energy storage flywheel generator (also as the geometric center of the rotor). Two end points of an eccentric arc on the inner rotor iron core 4 are positioned on the connecting line of the middle point of the tile-shaped edges of the magnetic separating blocks 3 at two sides of the corresponding permanent magnet 2 and the geometric center of the square wave energy storage flywheel generator, and meanwhile, the connecting line of the middle point of the eccentric arc and the center of the circle of the eccentric arc passes through the geometric center of the square wave energy storage flywheel generator.

As shown in fig. 2, point O in the figure is the geometric center of the square wave energy storage flywheel generator; A. b point is two end points of the eccentric arc, O' point is the center of the eccentric arc, and H point is the middle point of the eccentric arc; C. d, E is the middle point of the tile-shaped edge of the magnetic isolation blocks at the two sides of the permanent magnet 2;is the thickness of the permanent magnet 2;the radius of the inner profile of the outer rotor iron core 1;is the radius of the eccentric arc;the distance from two end points of the eccentric arc to the geometric center of the square wave energy storage flywheel generator is shown;the distance eccentricity value between the circle center of the eccentric arc and the geometric center of the square wave energy storage flywheel generator is taken as the eccentric value;is the tile-shaped inner diameter of the magnetic block 3,the outer diameter of the tube is the same as the diameter of the tube,is its opening angle;is the tile-shaped opening angle of the permanent magnet 2.

Two end points A, B of the eccentric arc are on the connection line of the middle point C, D of the tile-shaped edge of the magnetic isolation blocks 3 at two sides of the corresponding permanent magnet 2 and the geometric center O of the square wave energy storage flywheel generator, namely, A is on a line segment OC and B is on a line segment OD. The connecting line of the center point of the eccentric arc and the center of the circle passes through the geometric center of the energy storage flywheel generator, namely the point O is positioned on the line segment O' H.

Meanwhile, the square wave rotor designed based on the inner rotor core eccentric structure meets the following design regarding dimensions when being arranged:

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 thickness of the permanent magnet is equal to the tile-shaped opening angle of the magnetic isolation blockAnd satisfies the relation:(ii) a Tile-shaped opening angle of permanent magnetSatisfy the relationWhereinThe number of pole pairs of the square wave energy storage flywheel generator is.

2) The number of the eccentric arcs on the inner rotor iron core is as follows, and the relation is satisfied:；

3) the distance from two end points of the eccentric arc on the inner rotor iron core to the geometric center of the square wave energy storage flywheel generator isAnd satisfies the relation:；

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

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

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

。

the embodiment of the invention uses the inner contour radius of an outer rotorIs 65mm, and the thickness of the permanent magnet4.5mm, number of pole pairsFor example, the rotor structure of the square wave energy storage flywheel generator designed based on the eccentric structure of the inner rotor core is 4, and the magnetic isolation block and the eccentric inner rotor core are designed:

is composed ofObtaining the tile-shaped outer diameter of the magnetic separation blockIs 65mm and is represented by the formulaTo obtain a tile-shaped inner diameter61.175mm, is represented by the formulaTile-shaped opening angle for obtaining magnetic isolating blockSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably takes on a value ofIs of the formulaDetermining the tile-shaped opening angle of the permanent magnet 2Is composed of (42.5°)；

Is composed ofObtaining the distance from two end points of the eccentric arc to the geometric center of the square wave energy storage flywheel generatorSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,the preferred value is 55 mm;

is composed of

Obtaining the distance eccentricity value between the center of the eccentric arc and the geometric center of the square wave energy storage flywheel generatorSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably 30 mm;

is composed ofTo obtain the radius of the eccentric arcIs 83.5 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 outer diameter of the permanent magnet is 65mm, the thickness is 4.5mm, and the inner diameter is 60.5 mm. Compared with the traditional hollow cup type energy storage flywheel generator, the square wave energy storage flywheel generator rotor structure air gap magnetic field designed based on the inner rotor core eccentric structure is closer to a square wave.

Referring to FIG. 3, the square wave was evaluated in the flat top ratioPush-press typeIs calculated, whereinIs the part above 98% of the maximum value of the air-gap magnetic field in one period of the air-gap waveform,is the half cycle width of the air gap waveform. Compared with the traditional hollow cup energy storage flywheel generator structure, the invention ensures thatThe yield is increased from 48.14% to 66.85% and 38.9%.

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.