阅读说明：本技术 基于外转子铁心偏心结构设计的方波转子 (Square wave rotor designed based on outer rotor 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：本发明涉及发电机或电动机技术领域,具体公开了一种基于外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、定子、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,永磁体为瓦状,多个永磁体沿内转子铁心的径向外侧交替放置,且相邻两块永磁体的充磁方向相反,外转子铁心的外廓为圆形、内廓由周向的多个偏心圆弧构成,偏心圆弧的个数与永磁体的个数相同,外转子铁心的径向内侧与永磁体之间构成了环形气隙；本发明采用外转子铁心偏心结构设计后,有效改善了电机气隙磁密波形,使气隙磁场接近方波,从而改善了电机或发电机的反电动势波形,降低了转矩脉动,提升了电机性能。(The invention relates to the technical field of generators or motors, and particularly discloses a square wave rotor designed based on an outer rotor iron core eccentric structure; the outer rotor iron core is arranged at the outer end of the rotor shaft at the radial outer side, the inner rotor iron core is arranged at the inner end of the rotor shaft at the radial inner side, the permanent magnets are tile-shaped, the permanent magnets are alternately arranged along the radial outer side of the inner rotor iron core, the magnetizing directions of the two adjacent permanent magnets are opposite, the outer contour of the outer rotor iron core is circular, the inner contour of the outer rotor iron core is formed by a plurality of circumferential 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 inner side of the outer rotor iron core and the permanent magnets; the invention adopts the eccentric structure design of the outer rotor iron core, effectively improves the air gap flux density waveform of the motor, and leads the air gap magnetic field to be close to square waves, thereby improving the counter electromotive force waveform of the motor or the generator, reducing the torque pulsation and improving the motor performance.)

1. A square wave rotor designed based on an eccentric structure of an outer rotor iron core comprises the outer rotor iron core, a permanent magnet, a stator, 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 tile-shaped permanent magnets are alternately arranged along the radial outer side of the inner rotor iron core, the magnetizing directions of two adjacent permanent magnets are opposite, the outer contour of the outer rotor iron core is circular, the inner contour of the outer rotor iron core is formed by a plurality of circumferential eccentric arcs which are sunken outwards, 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, an annular air gap is formed between the radial inner side of the outer rotor iron core and the permanent magnets, and the stator is arranged in the annular air gap and fixed on the machine shell;

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

2. The square-wave rotor designed based on the outer rotor core eccentric structure according to claim 1, wherein the distance from the two end points of the eccentric arc to the geometric center isAnd satisfies the relation:。

3. the square wave rotor designed based on the outer rotor core eccentric structure according to claim 2, wherein a distance between a center of the eccentric arc and a geometric center of the rotor is an eccentric valueAnd satisfies the relation:whereinIs the radius of the outer contour of the inner rotor iron core,is an outer rotorThe radius of the outer contour of the core,is the thickness of the permanent magnet or magnets,is the number of pole pairs.

4. The square-wave rotor designed based on the eccentric structure of the outer rotor core as recited in claim 2, further comprising tile-shaped magnetic barriers having the same number as the permanent magnets, wherein the magnetic barriers are disposed between two adjacent permanent magnets, and two end points of the eccentric arc are located on an extension line connecting the center of the tile-shaped edges of the magnetic barriers at two sides of the corresponding permanent magnet and the geometric center of the rotor.

5. The square wave rotor designed based on the eccentric structure of the outer rotor core as recited in claim 3, wherein the inside diameter of the tile shape of the magnet isolation block isAnd satisfies the relation:the tile-shaped outer diameter of the magnetic isolating block isAnd satisfies the relation:whereinIs the radius of the outer contour of the inner rotor iron core,is the thickness of the permanent magnet.

6. The square wave rotor designed based on the eccentric structure of the outer rotor core as recited in claim 5, wherein the tile-shaped opening angle of the magnet isolation block isAnd satisfies the relation:the tile-shaped opening angle of the permanent magnet isSatisfy the relationWhereinIs the number of pole pairs.

7. The square wave rotor designed based on the outer rotor core eccentric structure according to claim 6, wherein the distance between the center of the eccentric arc and the geometric center is an eccentric valueAnd satisfies the relation:whereinIs the radius of the outer contour of the outer rotor iron core,is a magnetic isolation block coefficient and satisfies the relation:。

8. the square-wave rotor designed based on the outer rotor core eccentric structure according to claim 3 or 7, wherein the radius of the eccentric arc isAnd satisfies the relation:。

9. the square-wave rotor designed based on the eccentric structure of the outer rotor core as recited in claim 8, wherein the number of the eccentric arcs on the outer rotor core is set to beAnd satisfies the relation:。

Technical Field

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

Background

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

The invention with application number 2004101018988 discloses a brushless DC motor without a stator core, wherein a stator structure without a laminated core can be used in the design of the brushless DC motor, so that an inner rotor and an outer rotor are synchronously rotated along with a permanent magnet by a circular arc variable air gap iron core, thereby generating no loss in the iron core, and meanwhile, the stator without the laminated core is of a structure without a tooth slot, thereby eliminating the tooth slot torque and the tooth harmonic wave, but the brushless DC motor without the stator core has the same radial thickness of an air gap, thereby causing the consistent radial air gap magnetic resistance, influencing the distribution of an air gap magnetic field, causing the difference between the waveform of the air gap magnetic field and an ideal square wave to be larger, and influencing the performance of a motor or a generator; in addition, since the plurality of permanent magnets in the rotor are in direct contact with each other, inter-pole leakage flux is generated, and the performance of the generator or the motor is also affected to some extent.

Disclosure of Invention

The invention solves the technical problem of overcoming the problem of performance of a motor or a generator caused by large difference between a back electromotive force waveform and a square wave in the prior art, and provides a square wave rotor designed based on an outer rotor iron core eccentric structure, which is used for solving the problems of large difference between an air gap magnetic field waveform and the square wave and magnetic leakage between poles.

The invention is realized by the following technical scheme:

a square wave rotor based on an outer rotor iron core eccentric structure design comprises an outer rotor iron core, permanent magnets, a stator, an 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 outer side of the inner rotor iron core, the magnetizing directions of two adjacent permanent magnets are opposite, the outer contour of the outer rotor iron core is circular, the inner contour of the outer rotor iron core is formed by a plurality of circumferential outwards-recessed 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, an annular air gap is formed between the radial inner side of the outer rotor iron core and the permanent magnets, and the stator is arranged in the annular air gap and fixed on a machine shell;

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

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 arrangement of the above solution, the distance between the center of the eccentric arc and the geometric center of the rotor is an eccentricity valueAnd satisfies the relation:whereinIs the radius of the outer contour of the inner rotor iron core,is the radius of the outer contour of the outer rotor iron core,is the thickness of the permanent magnet or magnets,is the number of pole pairs.

The magnetic isolation device is characterized by further comprising tile-shaped magnetic isolation blocks, the number of the magnetic isolation blocks is equal to that of the permanent magnets, the magnetic isolation blocks are arranged between every two adjacent permanent magnets, and two end points of the eccentric arc are located on an extension line of connecting lines of tile-shaped edges of the magnetic isolation blocks on two sides of the corresponding permanent magnets and geometric centers of the rotors.

As a further arrangement of the above scheme, the tile-shaped inner diameter of the magnetic isolation block isAnd satisfies the relation:the tile-shaped outer diameter of the magnetic isolating block isAnd satisfies the relation:whereinIs the radius of the outer contour of the inner rotor iron core,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 magnet isSatisfy the relationWhereinIs the number of pole pairs.

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:whereinIs the radius of the outer contour of the outer rotor iron core,is a magnetic isolation block coefficient and satisfies the relation:。

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

in a further aspect of the present invention, the number of the eccentric arcs on the outer rotor core is set toAnd satisfies the relation:。

has the advantages that:

1) the generator disclosed by the invention adopts the square wave rotor designed based on the outer rotor iron core eccentric structure, and compared with the traditional coreless permanent magnet generator, the radial air gap thickness of the generator is not uniform along the circumference, so that the air gap flux density waveform of the generator is improved, the air gap flux density is close to the square wave, the back electromotive force waveform of the energy storage flywheel generator is improved, the torque pulsation is reduced, and the performance of the generator is improved. In a similar way, compared with the traditional coreless permanent magnet motor, the motor of the square-wave rotor designed based on the outer rotor core eccentric structure has the advantages that the thickness of the radial air gap of the motor is uneven, the change of the radial thickness of the air gap is more reasonable, the air gap flux density waveform of the motor is improved, the air gap magnetic field is close to the square wave, the counter electromotive force waveform of the coreless motor is improved, the torque pulsation is reduced, and the performance of the motor is improved.

2) Compared with the traditional motor or generator, the permanent magnet is attached to the inner rotor iron core, the radius is reduced, and the permanent magnet material is saved. In addition, the permanent magnets are separated by the magnetic separation blocks, so that magnetic loops generated on the sides of the permanent magnets are reduced, interpolar magnetic leakage is reduced, and the performance of the motor or 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 comparison of the air gap field of the flywheel brushless DC generator of embodiment 1 of the present invention and the conventional 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 showing the comparison between the air gap field of the hollow cup type square wave flywheel motor and the air gap field of the conventional hollow cup type motor 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 square wave rotor designed based on an eccentric structure of an outer rotor core, which is used in a flywheel brushless direct current generator. Referring to fig. 1 and 2, the entire rotor main body part includes an outer rotor core 1, a permanent magnet 2, a non-laminated core stator 3, an inner rotor core 4, and a rotor shaft 5. 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. In the specific arrangement, 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. The radial outer side of the inner rotor iron core 4 is provided with a permanent magnet 2, and the permanent magnet 2 is in a tile shape and has thicknessThe number of the pole pairs is determined according to the actual working requirement of the generator. When the permanent magnet magnetizing device is arranged, the permanent magnets 2 are alternately arranged along the radial outer side of the inner rotor iron core 4, and the magnetizing directions of two adjacent permanent magnets 2 are opposite. And a generator air gap is formed between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2, and the stator 3 without the laminated iron core is arranged in the air gap and fixed on the machine shell. The magnetic flux generated by the permanent magnet 2 forms a closed loop with the generator air gap between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2.

The inner rotor core 4 in this embodiment is in the shape of a circular ring having an outer radiusDetermined by the actual demand of the generator. The outer contour of the outer rotor iron core 1 is circular, and the circular radius thereofThe actual requirements of the generator determine that the inner contour of the rotor core 1 is formed by a group of eccentric arcs which are concentric and concave outwards, the number of the eccentric arcs is equal to that of the permanent magnets 2, and the positions of the eccentric arcs correspond to the permanent magnets 2 one by one.

When the rotor core is arranged, the circular outline of the outer rotor core 1, the inner outline of the tile-shaped permanent magnet 2 and the inner outline of the inner rotor core 4 are concentrically arranged, and the concentric point is used as the geometric center of the generator (also the geometric center of the rotor). Two end points of the eccentric arc on the outer rotor iron core 1 are positioned on the extension line of the connecting line of the two side edges of the corresponding permanent magnet 2 and the geometric center of the generator. Meanwhile, the center of the eccentric arc is positioned on the connecting line of the center of the eccentric arc and the geometric center of the generator.

Point O in fig. 2 is the geometric center of the generator; A. b, two points are 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;is the thickness of the permanent magnet;the radius of the outer contour of the outer rotor iron core 1;the radius of the outer contour of the inner rotor iron core 4;is the radius of the eccentric arc;the distance from two end points of the eccentric arc to the geometric center of the generator;the eccentricity value is the distance between the center of the eccentric arc and the geometric center of the rotor.

The specific relevant parameters in this embodiment are as follows:

the number of the eccentric arcs arranged on the inner contour of the outer rotor iron core isAnd satisfies the relation:whereinThe number of pole pairs of the generator is;

eccentricity value between circle center of eccentric arc and geometric center of generatorAnd satisfies the relation:whereinWhich is the radius of the outer contour of the outer rotor core 1,which is the radius of the outer contour of the inner rotor core 4,is the thickness of the permanent magnet;

the distance from two end points of the eccentric arc to the geometric center of the generator isAnd satisfies the relation:；

the radius of the eccentric arc isAnd satisfies the relation:。

in this embodiment 1, an outer rotor is used to change the outer diameter of the air gap from a circular arcIs 86mm, and the outer diameter of the inner rotorIs 50mm, and the thickness of the permanent magnet5mm, number of pole pairsTaking an energy storage flywheel brushless direct-current generator designed based on an outer rotor core eccentric structure as an example, the outer rotor shared circular arc variable air gap core is designed:

is composed ofObtaining the value of the air gap of the circular arcSatisfy the requirement ofConvenient processing and variable air gap value of the circular arcPreferably 10 mm;

is composed ofThe distance from two end points of the single common-cycle arc variable air gap arc to the geometric center of the generator is obtained asSatisfy the requirement ofConvenient for processingPreferably 60 mm;

is obtained by the formulaThe radius of the single common-circumference arc variable-air-gap arc is obtained asIs 50.9 mm.

The traditional energy storage flywheel generator is used as a comparative example, and the generator parameters are that the outer diameter of the outer rotor is 86mm, the inner diameter of the outer rotor is 60mm, and the number of pole pairs isThe outer diameter of the inner rotor is 50mm, the outer diameter of the permanent magnet is 55mm, the thickness is 5mm, and the inner diameter is 50 mm.

Compared with the traditional energy storage flywheel generator, the flywheel brushless direct current generator based on the structure of the embodiment 1 has the air gap magnetic field which is closer to a square wave. As shown in FIG. 3, the square wave was evaluated in such a manner that the flat top portion was accounted forPush-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,the invention has the air gap waveform with half cycle width, compared with the structure of the traditional coreless cup generatorThe lifting rate is increased from 50.66% to 68.99%, and the lifting rate is increased by 36.2%.

Example 2

Embodiment 2 discloses a square wave rotor designed based on an outer rotor core eccentric structure, which is used in a hollow cup type square wave flywheel motor, and referring to fig. 4 and fig. 5, the whole rotor main body component comprises an outer rotor core 1, a permanent magnet 2, a magnetism isolating block 6, a hollow cup stator 3, an inner rotor core 4 and a rotor shaft 5. Both the outer rotor core 1 and the inner rotor core 4 are fixedly connected to the rotor shaft 5, so that the outer rotor core 1 and the inner rotor core 4 can be rotated together with the rotor shaft 5. When the permanent magnet generator is specifically arranged, the radial outer side of the outer rotor iron core 1 is arranged at the outer end of the rotor shaft 5, the radial inner side of the inner rotor iron core 4 is arranged at the inner end of the rotor shaft 5, the radial outer side of the inner rotor iron core 4 is provided with the permanent magnet 2, the permanent magnet 2 is in a tile shape, the thickness of the permanent magnet is determined according to the actual working requirement of the generator, and the number of the permanent magnet is determined according to the number of pole pairs of the motor. The permanent magnets 2 are alternately arranged along the radial outer side of the inner rotor iron core 4, and the magnetizing directions of two adjacent permanent magnets 2 are opposite. Meanwhile, the magnetic isolation blocks 6 are also tile-shaped and are arranged between two adjacent permanent magnets, and the number of the magnetic isolation blocks is the same as that of the permanent magnets. A motor air gap is formed between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2, the hollow cup stator 3 is arranged in the air gap and fixed on the machine shell, and magnetic flux generated by the permanent magnet 2 forms a closed loop through the air gap between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2.

The inner rotor core 4 in this embodiment is circular in shape and has an outer radiusDetermined by the actual demand of the motor. The inner contour of the outer rotor iron core 1 is formed by a group of eccentric arcs which are sunken outwards, the number of the eccentric arcs is consistent with that of the permanent magnets 2, the positions of the eccentric arcs correspond to the permanent magnets 2 one by one, the outer contour of the outer rotor iron core 1 is circular, and the radius of the outer rotor iron core 1 is circularDetermined by the actual demand of the motor.

When the motor is arranged, the circular outline of the outer rotor iron core 1, the inner outline of the tile-shaped permanent magnet 2 and the inner outline and the outer outline of the inner rotor iron core 4 are concentrically arranged, and the concentric point of the motor is used as the geometric center of the motor (also the geometric center of the rotor). Two end points of the eccentric arc are positioned on an extension line of a connecting line of the middle point of the magnetic isolation blocks 6 at two sides of the corresponding permanent magnet 2 and the geometric center of the motor, and a ray led out from the middle point of the eccentric arc to the circle center direction passes through the corresponding permanent magnet 2, the inner rotor iron core 4 and the rotor shaft 5 and passes through the geometric center of the motor.

Point O in fig. 5 is the geometric center of the motor; A. b, two points are 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 separation block 6 between the adjacent permanent magnets 2;is the thickness of the permanent magnet;the radius of the outer contour of the outer rotor iron core 1;the radius of the outer contour of the inner rotor iron core 4;is the radius of the eccentric arc;the distance from two end points of the eccentric arc to the geometric center of the motor;the eccentric value is the distance between the center of the eccentric arc and the geometric center of the motor;is the inner diameter of the tile-shaped magnetic isolating block,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.

The specific relevant parameters in this embodiment are as follows:

the tile-shaped inner diameter of the magnetic isolation block isAnd satisfies the relation:the tile-shaped outer diameter isAnd satisfies the relation:whereinWhich is the radius of the outer contour of the inner rotor core 4,is the thickness of the permanent magnet 2;

the magnetic isolation block tile has an opening angle ofAnd satisfies the relation:tile-shaped opening angle of permanent magnetSatisfy the relationWhereinThe number of pole pairs of the motor is;

the number of the eccentric arcs on the outer rotor iron core isAnd satisfies the relation:；

the distance between the center of the eccentric arc and the geometric center of the motor is an eccentric valueAnd satisfies the relation:wherein, in the step (A),which is the radius of the outer contour of the outer rotor core 1,the coefficient of the magnetic isolation block satisfies the relation:；

the distance from two end points of the eccentric arc to the geometric center of the motor isAnd satisfies the relation:；

the radius of the eccentric arc isAnd satisfies the relation:。

example 2 outer diameter of outer rotor coreIs 95mm, and the outer diameter of the inner rotorIs 70mm, and the thickness of the permanent magnet5mm, number of pole pairsFor example, the hollow cup-shaped square wave motor based on the eccentricity of the outer rotor core is 4, and the magnetic isolation block and the outer rotor core are designed:

is composed ofObtaining the tile-shaped inner diameter of the magnetic separation blockIs of the formulaObtaining the tile-shaped outer diameter of the magnetic separation block。

By the formulaDewar tile type opening angleSatisfy 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 ofCalculating the eccentricity of the outer rotor coreSatisfy the requirement ofEccentricity of the steel sheet for easy processingPreferably 10 mm;

is composed ofThe distance from two end points of the eccentric arc to the geometric center of the motor is obtained asSatisfy the requirement ofIn order to facilitate the processing and the manufacturing,preferably 80 mm;

is obtained by the formulaThe radius of a single eccentric circular arc is obtained as70.86 mm.

The motor parameters of the traditional hollow cup type motor are that the outer diameter of an eccentric outer rotor is 95mm, the inner diameter is 70mm, and the number of pole pairs is 95mm4 pairs, the outer diameter of the inner rotor is 80mm, the outer diameter of the permanent magnet is 76mm, the thickness is 6mm, and the inner diameter is 70 mm.

Compared with the traditional hollow cup type motor, the square wave motor disclosed in the embodiment 2 has the air gap magnetic field closer to the square wave. As shown in FIG. 6, the square wave was evaluated in such a manner that the flat top portion was occupiedPush-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,the air gap waveform is half cycle width, compared with the structure of the traditional hollow cup motor, the invention ensures thatThe yield is increased from 62.03% to 71.27% and 14.9%.

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.