CN113541351B - Sine wave rotor based on permanent magnet and outer rotor core eccentric structure design - Google Patents

Sine wave rotor based on permanent magnet and outer rotor core eccentric structure design Download PDF

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Publication number
CN113541351B
CN113541351B CN202110625154.XA CN202110625154A CN113541351B CN 113541351 B CN113541351 B CN 113541351B CN 202110625154 A CN202110625154 A CN 202110625154A CN 113541351 B CN113541351 B CN 113541351B
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eccentric
outer rotor
permanent magnet
iron core
arc
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CN113541351A (en
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陈胜林
苏森
韩坤
王志强
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Anhui Huachi Kinetic Energy Technology Co ltd
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Anhui Huachi Kinetic Energy Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H02K21/021—Means for mechanical adjustment of the excitation flux
    • H02K21/028—Means for mechanical adjustment of the excitation flux by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention relates to the technical field of motors, and particularly discloses a sine wave rotor based on an eccentric structure design of a permanent magnet and an outer rotor core; the outer rotor iron core is circular, the inner profile of the outer rotor iron core is formed by a plurality of inwards-protruding eccentric arcs in the circumferential direction, the number of the eccentric arcs is the same as that of the eccentric permanent magnets, the positions of the eccentric arcs are in one-to-one correspondence with the eccentric permanent magnets, and an annular air gap is formed between the radial inner side of the outer rotor iron core and the eccentric permanent magnets; the rotor based on the eccentric structure design of the permanent magnet and the outer rotor iron core improves the air gap magnetic density waveform of the motor or the generator, reduces the harmonic content in the air gap magnetic field, enables the air gap magnetic field to be close to sine wave, and improves the performance of the motor or the generator.

Description

Sine wave rotor based on permanent magnet and outer rotor core eccentric structure design
Technical Field
The invention relates to the technical field of motors or generators, and particularly discloses a sine wave rotor based on an eccentric structure design of a permanent magnet and an outer rotor core.
Background
The traditional permanent magnet synchronous motor is mainly applied to high-rotation-speed occasions and needs higher speed regulation precision, so that the speed regulation precision is mainly controlled by sine wave phase current in a driving mode, the sine wave phase current needs to interact with sine wave phase counter electromotive force to reduce electromagnetic torque pulsation, and the 3, 5 and 7 times harmonic content in the counter electromotive force waveform of the traditional magnetic suspension energy storage flywheel permanent magnet motor is larger, so that the motor generates electromagnetic torque pulsation, and the performance and efficiency of the motor are affected. The main reason for the larger harmonic content of the back electromotive force waveform of the magnetic suspension energy storage flywheel permanent magnet motor is that the sine type of the motor air gap magnetic field waveform is worse, more odd harmonics are mixed in, so that the air gap magnetic field of the motor is close to a trapezoid, and the harmonic content of the back electromotive force waveform is larger.
Similarly, the traditional sine wave energy storage flywheel generator is also driven and controlled by sine wave phase current, the sine wave phase current needs to interact with sine wave phase counter electromotive force to reduce electromagnetic torque pulsation, and the traditional hollow cup type permanent magnet energy storage flywheel generator has larger 4, 6 and 7 times of harmonic content in counter electromotive force waveforms, so that the energy storage flywheel generator generates electromagnetic torque pulsation to influence the performance and efficiency of the energy storage flywheel generator, and the main reason that the counter electromotive force waveform harmonic content of the hollow cup type permanent magnet energy storage flywheel generator is larger is that the sine type of the air gap magnetic field waveform of the energy storage flywheel generator is worse, more odd harmonics are mixed, so that the air gap magnetic field of the energy storage flywheel generator is close to trapezium, and therefore the harmonic content of the counter electromotive force waveform is larger. It is important to optimize the motor and generator structure, reduce the harmonic content of the air-gap field waveform, and make the air-gap field waveform approximate to sine wave.
Disclosure of Invention
The invention aims at solving the technical problems that the performance of a motor or a generator is influenced by larger harmonic content of back electromotive force waveforms in a traditional permanent magnet synchronous motor and a traditional sine wave energy storage flywheel generator, and designs a sine wave rotor which can optimize the structure of the motor and the generator, reduce the harmonic content of waveforms of an air gap magnetic field and improve the performance of the motor or the generator.
The invention is realized by the following technical scheme:
the sine wave rotor based on the eccentric structure design of the permanent magnets and the outer rotor iron core comprises an outer rotor iron core, eccentric 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 eccentric permanent magnets are alternately arranged along the radial outer side of the inner rotor iron core, the magnetizing directions of two adjacent eccentric permanent magnets are opposite, the eccentric permanent magnets consist of circular arc inner contours, eccentric circular arc outer contours and two side edges, the circle center of the eccentric circular arc outer contours is positioned on the connecting line of the middle point of the circular arc inner contours and the circle center of the circular arc inner contours, the outer rotor iron core outer contours are formed by a plurality of inwards-protruding eccentric circular arcs in the circumferential direction, the number of eccentric circular arcs on the outer rotor iron core is the same as that of the eccentric permanent magnets, the positions of the eccentric circular arcs correspond to the eccentric permanent magnets one by one, an annular air gap is formed between the radial inner side of the outer rotor iron core and the eccentric permanent magnets, and the stator is arranged in the annular air gap and fixed on a shell;
the circular outline of the outer rotor iron core, the circular arc edge inner outline of the eccentric permanent magnet and the inner outline of the inner rotor iron core are concentrically arranged, the concentric points are the geometric centers of the rotor, two end points of the eccentric circular arc on the outer rotor iron core are on extension lines of connecting the two sides of the corresponding eccentric permanent magnet with the geometric centers of the rotor, the reverse extension line of the connecting line of the center of the eccentric circular arc on the outer rotor iron core is led out from the middle point of the eccentric circular arc on the outer rotor iron core to pass through the geometric centers of the rotor, and the center of the eccentric circular arc on the outer rotor iron core is positioned on the radial outer side of the outer rotor iron core.
As a further arrangement of the scheme, the clamping angles of the two side edges of the eccentric permanent magnet are crossing angles
Figure 725677DEST_PATH_IMAGE002
And satisfies the relationship: />
Figure 162474DEST_PATH_IMAGE004
Wherein->
Figure 117661DEST_PATH_IMAGE006
The radius of the eccentric arc outline of the eccentric permanent magnet is +.>
Figure 32527DEST_PATH_IMAGE008
And satisfies the relationship:
Figure 756770DEST_PATH_IMAGE010
wherein->
Figure 364468DEST_PATH_IMAGE012
For the radius of the inner rotor core contour +.>
Figure 682317DEST_PATH_IMAGE014
Is the distance between the middle points of the inner outline and the outer outline of the eccentric permanent magnet.
As a further arrangement of the above proposal, the distance from the middle point of the eccentric circular arc on the outer rotor core to the geometric center is
Figure 525508DEST_PATH_IMAGE016
The relation is satisfied: />
Figure 245203DEST_PATH_IMAGE018
The radius of the eccentric arc on the outer rotor core is +.>
Figure 151366DEST_PATH_IMAGE020
Satisfy the relation:>
Figure 690932DEST_PATH_IMAGE022
。
as a further arrangement of the scheme, the magnetic isolation blocks which are equal to the eccentric permanent magnets in number and are tile-shaped are further included, each magnetic isolation block is arranged between two adjacent eccentric permanent magnets, and two end points of the eccentric arc on the outer rotor core are arranged on extension lines of connecting points of the magnetic isolation blocks at two sides of the corresponding eccentric permanent magnets with the geometric center.
As a further arrangement of the proposal, the tile-shaped inner diameter of the magnetism isolating block is
Figure 478760DEST_PATH_IMAGE024
The relation is satisfied: />
Figure 912015DEST_PATH_IMAGE026
The tile-shaped outer diameter is->
Figure 127096DEST_PATH_IMAGE028
The relation is satisfied: />
Figure 13012DEST_PATH_IMAGE030
Wherein->
Figure 338951DEST_PATH_IMAGE032
For the radius of the inner rotor core contour +.>
Figure 626713DEST_PATH_IMAGE034
The tile-shaped opening angle of the magnetism isolating block is +.>
Figure 12695DEST_PATH_IMAGE036
The relation is satisfied: />
Figure 526853DEST_PATH_IMAGE038
The tile-shaped opening angle of the eccentric permanent magnet>
Figure 781117DEST_PATH_IMAGE040
Satisfy the relation->
Figure 798751DEST_PATH_IMAGE042
Wherein->
Figure 621214DEST_PATH_IMAGE044
Is the pole pair number of the motor.
As a further arrangement of the above scheme, the radius of the eccentric arc outline of the eccentric permanent magnet is
Figure 481722DEST_PATH_IMAGE046
And satisfies the relationship: />
Figure 883885DEST_PATH_IMAGE048
Wherein->
Figure 411818DEST_PATH_IMAGE050
For the magnetic block coefficients, the relation is satisfied:
Figure 139603DEST_PATH_IMAGE052
。
as a further arrangement of the above proposal, the distance from the middle point of the eccentric circular arc on the outer rotor core to the geometric center is
Figure 362774DEST_PATH_IMAGE054
The relation is satisfied: />
Figure 958840DEST_PATH_IMAGE056
The method comprises the steps of carrying out a first treatment on the surface of the The radius of the eccentric arc on the outer rotor core is +.>
Figure 216646DEST_PATH_IMAGE058
The relation is satisfied:
Figure 965598DEST_PATH_IMAGE060
。
as a further arrangement of the scheme, the distance between the center of the eccentric circular arc outer profile and the center of the circular arc inner profile on the eccentric permanent magnet is an eccentric value
Figure 676065DEST_PATH_IMAGE062
And satisfies the relationship: />
Figure 951188DEST_PATH_IMAGE064
。
As a further arrangement of the scheme, the distance between the center of the eccentric arc on the outer rotor core and the geometric center is an eccentric value
Figure 922555DEST_PATH_IMAGE066
Satisfy the relation:>
Figure 992142DEST_PATH_IMAGE068
the radius of the circular outline of the outer rotor core is +.>
Figure 314539DEST_PATH_IMAGE070
The relation is satisfied:
Figure 127774DEST_PATH_IMAGE072
。
as a further arrangement of the proposal, the number of eccentric circular arcs on the outer rotor core is
Figure 360173DEST_PATH_IMAGE074
And satisfies the relationship: />
Figure 459716DEST_PATH_IMAGE076
Wherein->
Figure 144775DEST_PATH_IMAGE078
Is the pole pair number of the motor.
Compared with the prior art, the invention has the advantages that:
1) The rotor based on the eccentric structure design of the permanent magnet and the outer rotor iron core is adopted, so that the radial air gap thickness edge of the motor or the generator is uneven, the change of the radial air gap thickness is more reasonable, the air gap magnetic density waveform of the motor or the generator is improved, the harmonic content in an air gap magnetic field is reduced, the air gap magnetic field is close to a sine wave, the counter electromotive force waveform of the motor or the generator is improved, the torque pulsation is reduced, and the performance of the motor or the generator is improved.
2) Compared with the traditional hollow cup permanent magnet motor or hollow cup energy storage flywheel generator, the rotor adopting the design based on the eccentric structure of the permanent magnet and the outer rotor iron core has the advantages that the permanent magnet is attached to the iron core of the inner rotor, the radius is reduced, and the permanent magnet material is saved; and the permanent magnets are separated by the magnetic separation blocks, so that magnetic loops generated on the side edges of the permanent magnets are reduced, interelectrode magnetic flux leakage is reduced, and the performance of the motor or the generator is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic view showing a partial structure of embodiment 1 of the present invention;
fig. 3 is a schematic diagram illustrating a comparison of an air gap field between a magnetic levitation energy storage flywheel permanent magnet synchronous motor and a conventional magnetic levitation energy storage flywheel motor according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 5 is a schematic view showing a partial structure of embodiment 2 of the present invention;
FIG. 6 is a schematic diagram showing a partial structure of embodiment 2 of the present invention;
fig. 7 is a schematic diagram showing the comparison of the air gap field between the hollow cup type sine wave energy storage flywheel generator and the conventional hollow cup type energy storage flywheel generator according to the embodiment 2 of the present invention.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the 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; may 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will now be described in detail with reference to the accompanying drawings 1-7, in conjunction with examples.
Example 1
Embodiment 1 discloses a sine wave rotor based on permanent magnet and outer rotor core eccentric structure design for a magnetic suspension energy storage flywheel permanent magnet synchronous motor. Referring to fig. 1 and 2, the magnetic levitation energy storage flywheel comprises an outer rotor iron core 1, an eccentric permanent magnet 2, a magnetic levitation energy storage flywheel stator 3, an inner rotor iron core 4 and a rotor shaft 5, wherein the outer rotor iron core 1 and the inner rotor iron core 4 are fixedly connected to the rotor shaft 5, so that the outer rotor iron core 1 and the inner rotor iron core 4 can rotate together with the rotor shaft 5. The radially outer side of the outer rotor core 1 is mounted at the outer end of the rotor shaft 5 during a specific setting process, and the radially inner side of the inner rotor core 4 is mounted at the inner end of the rotor shaft. A plurality of eccentric permanent magnets 2 are alternately arranged along the radial outer side of the inner rotor core 4, and the magnetizing directions of two adjacent eccentric permanent magnets 2 are opposite. The eccentric permanent magnet 2 consists of an arc edge inner contour, an eccentric arc outer contour and two side edges, the round point of the eccentric arc outer contour is positioned on the connecting line of the middle point of the arc edge inner contour and the circle center, and the number of the specific eccentric permanent magnets 2 is determined according to the pole pair number. An annular air gap is formed between the radial inner side of the outer rotor iron core 1 and the eccentric permanent magnet 2, and the magnetic suspension energy storage flywheel stator 3 is arranged in the air gap and fixed on the shell. The magnetic flux generated by the eccentric permanent magnet 2 passes through the outer rotor core 1 and the inner rotor core 4 and an air gap between them forms a closed circuit.
The inner rotor core 4 in this embodiment is circular in shape and has an outer radius
Figure 886335DEST_PATH_IMAGE080
Is determined by the actual requirements of the motor. The outer rotor iron core 1 has a circular outline, the inner outline is composed of a group of eccentric circular arcs, the number of the eccentric circular arcs is consistent with that of the eccentric permanent magnets 2, the positions of the eccentric circular arcs are in one-to-one correspondence with the eccentric permanent magnets 2, and the number of the eccentric circular arcs on the outer rotor iron core 1 is +.>
Figure 707660DEST_PATH_IMAGE082
And satisfies the relationship: />
Figure 119050DEST_PATH_IMAGE084
Wherein->
Figure 150460DEST_PATH_IMAGE086
Is the pole pair number of the motor.
In this embodiment, the circular outer contour of the outer rotor core 1, the circular arc inner contour of the eccentric permanent magnet 2, and the inner and outer contours of the inner rotor core 4 are arranged concentrically, and the concentric points are used as the geometric center of the motor (also the geometric center of the rotor). The two end points of the eccentric arc on the outer rotor iron core 1 are arranged on the extension lines of the connecting lines of the two sides of the corresponding eccentric permanent magnet 2 and the geometric center of the motor, the circle center of the eccentric arc on the outer rotor iron core 1 is arranged on the opposite extension lines of the connecting lines of the middle points of the arc sides of the corresponding eccentric permanent magnet 2 and the geometric center of the motor, and meanwhile, the circle center of the eccentric arc is positioned on the radial outer side of the outer contour of the outer rotor iron core 1.
As shown in fig. 2, the O point in the figure is the geometric center of the motor; h 1 The point is the middle point of the eccentric arc outline on the eccentric permanent magnet, O 1 The point is the center of a circle, H 2 Is the middle point of the inner contour of the circular arc edge of the eccentric permanent magnet; A. the two points B are two end points of the eccentric arc on the outer rotor iron core, O 2 The point is the center of a circle, H 3 The point is the middle point; is the middle point H of the inner outline and the outer outline of the eccentric permanent magnet 1 H 2 The distance between them;
Figure 305498DEST_PATH_IMAGE088
radius of the outer contour of the inner rotor core; />
Figure 371543DEST_PATH_IMAGE090
The radius of the eccentric arc on the outer rotor iron core; />
Figure 953834DEST_PATH_IMAGE092
Is the radius of the eccentric arc outline of the eccentric permanent magnet, < >>
Figure 613485DEST_PATH_IMAGE094
Is an eccentric value between the circle center of the eccentric arc outer profile and the circle center of the arc inner profile on the eccentric permanent magnet; />
Figure 431269DEST_PATH_IMAGE096
For the distance from the middle point of the eccentric arc on the outer rotor core to the geometric center of the motor, < >>
Figure 227186DEST_PATH_IMAGE098
For the eccentric value between the center of the eccentric arc and the geometric center of the outer rotor core, ">
Figure 107942DEST_PATH_IMAGE100
The radius of the outer rotor core 1 is defined.
The round point of the eccentric circular arc outline on the eccentric permanent magnet is positioned between the midpoint of the circular arc plate inner outline and the circle center, namely O 1 At line segment OH 2 And (3) upper part. The two end points A, B of the eccentric arc on the outer rotor core are on the extension lines of the connecting lines of the two sides of the corresponding eccentric permanent magnet and the geometric center O of the motor, namely the two sides of the eccentric permanent magnet corresponding to the eccentric arc on the outer rotor core are on the line segments OA and OB. The center of the eccentric arc on the outer rotor core is on the reverse extension line of the connecting line between the midpoint of the arc edge of the corresponding eccentric permanent magnet and the geometric center of the motor, namely O 2 The point being located at line segment OH 3 Is positioned on the radial outer side of the outline of the outer rotor core, and is positioned on the connecting line O between the midpoint of the eccentric arc and the center of the circle on the outer rotor core 1 2 H 3 Passes through the radial contour of the outer rotor core 1.
The design-related parameters are as follows:
the included angle between two sides of the eccentric permanent magnet 2 is the opening angle
Figure 989311DEST_PATH_IMAGE102
And satisfies the relationship: />
Figure 610785DEST_PATH_IMAGE104
Wherein->
Figure 261209DEST_PATH_IMAGE106
The pole pair number of the motor is; the radius of the eccentric arc outline of the eccentric permanent magnet is +.>
Figure DEST_PATH_IMAGE108
And satisfies the relationship:
Figure DEST_PATH_IMAGE110
wherein->
Figure DEST_PATH_IMAGE112
For the radius of the outer contour of the inner rotor core 4 +.>
Figure DEST_PATH_IMAGE114
Is the distance between the middle points of the inner outline and the outer outline of the eccentric permanent magnet; the distance between the center of the eccentric arc outline and the center of the arc edge on the eccentric permanent magnet is an eccentric value +.>
Figure DEST_PATH_IMAGE116
And satisfies the relationship: />
Figure DEST_PATH_IMAGE118
。
The distance from the middle point of the eccentric arc on the outer rotor iron core to the geometric center of the motor is
Figure DEST_PATH_IMAGE120
The relation is satisfied:
Figure DEST_PATH_IMAGE122
the method comprises the steps of carrying out a first treatment on the surface of the The radius of the eccentric arc group on the outer rotor core is as follows, and the relation is satisfied:
Figure DEST_PATH_IMAGE124
the method comprises the steps of carrying out a first treatment on the surface of the The distance between the center of the eccentric arc group on the outer rotor core and the geometric center of the motor is an eccentric value +.>
Figure DEST_PATH_IMAGE126
Satisfy the relation:>
Figure DEST_PATH_IMAGE128
the method comprises the steps of carrying out a first treatment on the surface of the The outer rotor core has a profile radius of +.>
Figure DEST_PATH_IMAGE130
Satisfy the relation:>
Figure DEST_PATH_IMAGE132
。
the embodiment uses an inner rotor core outer diameter
Figure DEST_PATH_IMAGE134
48mm, eccentric permanent magnet thickness +.>
Figure DEST_PATH_IMAGE136
4mm, pole pair->
Figure DEST_PATH_IMAGE138
For the example of the magnetic suspension energy storage flywheel permanent magnet synchronous motor based on the rotor with the eccentric structure of the permanent magnet and the outer rotor core, the eccentric permanent magnet and the outer rotor core are designed:
from the formula
Figure DEST_PATH_IMAGE140
Obtaining the included angle between two sides of the eccentric permanent magnet as a crossing angle +.>
Figure DEST_PATH_IMAGE142
Is->
Figure DEST_PATH_IMAGE144
(45°)；
From the formula
Figure DEST_PATH_IMAGE146
Obtaining the radius of the eccentric arc outline of the eccentric permanent magnet>
Figure DEST_PATH_IMAGE148
Satisfy->
Figure DEST_PATH_IMAGE150
For easy processing, add->
Figure DEST_PATH_IMAGE152
Preferably 47mm;
from the formula
Figure DEST_PATH_IMAGE154
Obtaining the eccentric value of the distance between the center of the eccentric arc outer profile and the center of the arc inner profile on the eccentric permanent magnet +.>
Figure DEST_PATH_IMAGE156
=5 mm, by the formula->
Figure DEST_PATH_IMAGE158
Obtaining the distance from the middle point of the eccentric arc on the outer rotor core to the geometric center of the motor>
Figure DEST_PATH_IMAGE160
Satisfy->
Figure DEST_PATH_IMAGE162
For easy processing, add->
Figure DEST_PATH_IMAGE164
Preferably 60mm;
from the formula
Figure DEST_PATH_IMAGE166
Obtaining the radius of the eccentric arc on the outer rotor core>
Figure DEST_PATH_IMAGE168
Satisfy->
Figure 60669DEST_PATH_IMAGE170
For easy processing, add->
Figure 960492DEST_PATH_IMAGE168
Preferably 40mm;
from the formula
Figure 588919DEST_PATH_IMAGE172
Obtaining the distance between the center of the eccentric arc on the outer rotor core and the geometric center of the motor>
Figure 625008DEST_PATH_IMAGE174
Is 100mm, is represented by formula->
Figure 316408DEST_PATH_IMAGE176
Obtaining the radius of the circular outer side of the outer rotor core>
Figure 437948DEST_PATH_IMAGE178
Satisfy->
Figure 807750DEST_PATH_IMAGE180
For easy processing, add->
Figure 495083DEST_PATH_IMAGE182
The preferred value is 108mm.
The traditional magnetic suspension energy storage flywheel motor is used as a comparative example, and the motor parameters are that the outer rotor has an outer diameter of 108mm, an inner diameter of 60mm and pole pair numbers
Figure 292138DEST_PATH_IMAGE184
Figure 292138DEST_PATH_IMAGE184
4, the outer diameter of the inner rotor is 48mm, the outer diameter of the permanent magnet is 52mm, the thickness is 4mm, and the inner diameter is 48mm.
Compared with the traditional magnetic suspension energy storage flywheel motor, the magnetic suspension energy storage flywheel permanent magnet synchronous motor disclosed by the embodiment has the air gap field which is more similar to sine waves. Introducing Total Harmonic Distortion (THD) in the evaluation process to evaluate the sine of the air-gap magnetic field waveform, performing Fourier decomposition transformation on the air-gap magnetic field waveform to obtain the amplitude of each order of harmonic, and determining the formula
Figure 900973DEST_PATH_IMAGE186
The smaller the THD is calculated, the better the sinusoid. As shown in fig. 3, compared with the traditional magnetic suspension energy storage flywheel motor structure, the THD is reduced from 31.8% to 16.4%, the THD is reduced by 48.4%, and the waveform of the air gap magnetic field is more similar to a sine wave.
Example 2
Embodiment 2 discloses a sine wave rotor based on permanent magnet and outer rotor core eccentric structure design for use in a hollow cup sine wave energy storage flywheel generator. Referring to fig. 4, 5 and 6, it includes an outer rotor core 1, an eccentric permanent magnet 2, a tile-shaped magnetism isolating block 6, a coreless stator 3, an inner rotor core 4 and a rotor shaft 5. 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 rotate together with the rotor shaft 5. The radially outer side of the outer rotor core 1 is mounted at the outer end of the rotor shaft 5 and the radially inner side of the inner rotor core 4 is mounted at the inner end of the rotor shaft 5 during a specific installation process. A plurality of eccentric permanent magnets 2 are alternately arranged along the radial outer side of the inner rotor core 4, and the magnetizing directions of two adjacent eccentric permanent magnets 2 are opposite. The eccentric permanent magnet 2 consists of an arc edge inner profile, an eccentric arc outer profile and two side edges, the round point of the eccentric arc outer profile is positioned on the connecting line of the middle point of the arc edge inner profile and the circle center, and the number of the specific eccentric permanent magnets 2 is determined according to the pole pair number. Meanwhile, tile-shaped magnetism isolating blocks 6 are arranged between two adjacent eccentric permanent magnets 2, and the number of the magnetism isolating blocks is the same as that of the eccentric permanent magnets 2. An air gap of the motor is arranged between the radial inner side of the outer rotor iron core 1 and the eccentric permanent magnet 2, and the hollow cup stator 3 is arranged in the air gap and fixed on the shell. The magnetic flux generated by the eccentric permanent magnet 2 passes through the outer rotor core 1 and the inner rotor core 4 and an air gap between them forms a closed circuit.
In this embodiment, the inner rotor core 4 is in the shape of a circular ring, and has an outer radius
Figure 871203DEST_PATH_IMAGE188
Is determined by the actual demand of the energy storage flywheel generator. The outer rotor iron core 1 has a circular outline, the inner outline is composed of a group of eccentric arcs, the number of the eccentric arcs is consistent with that of the eccentric permanent magnets 2, the positions of the eccentric arcs are in one-to-one correspondence with the eccentric permanent magnets 2, the number of the eccentric arcs on the outer rotor iron core 1 is as follows, and the relation formula is satisfied: />
Figure 881885DEST_PATH_IMAGE190
Wherein->
Figure 912158DEST_PATH_IMAGE192
Is the pole pair number of the motor.
In the embodiment, the circular outline of the outer rotor core 1, the circular arc outline of the eccentric permanent magnet 2 and the inner outline of the inner rotor core 4 are concentrically arranged, and the concentric points are used as the geometric center of the energy storage flywheel generator. The two end points of the eccentric arc on the outer rotor iron core are arranged on the reverse extension lines of the connection lines between the middle points of the 6W-shaped sides of the magnetic isolation blocks corresponding to the two sides of the eccentric permanent magnet 2 and the geometric center. The center of the eccentric arc on the outer rotor core is positioned on the opposite extension line of the connecting line of the middle point of the arc edge of the corresponding eccentric permanent magnet 2 and the geometric center and is positioned on the radial outer side of the outer rotor core 1.
As shown in fig. 5 and 6, the O point in the figure is the geometric center of the energy storage flywheel generator; h 1 The point is the middle point of the eccentric arc outline of the eccentric permanent magnet, O 1 The point is the center of a circle, H 2 Is the middle point of the inner contour of the circular arc edge of the eccentric permanent magnet; A. the two points B are two end points of the eccentric arc on the outer rotor iron core, O 2 The point is the center of a circle, H 3 The point is the middle point; C. d, E is the midpoint of the tile-shaped side of the spacing magnet of the adjacent eccentric permanent magnets;
Figure 8290DEST_PATH_IMAGE194
is the middle point H of the inner outline and the outer outline of the eccentric permanent magnet 1 H 2 The distance between them; />
Figure 719894DEST_PATH_IMAGE196
Radius of the outer contour of the inner rotor core; />
Figure 912978DEST_PATH_IMAGE198
The radius of the eccentric arc on the outer rotor iron core; />
Figure 51835DEST_PATH_IMAGE200
The radius of the eccentric arc outline on the eccentric permanent magnet is the same as the radius of the eccentric arc outline on the eccentric permanent magnet; />
Figure 432001DEST_PATH_IMAGE202
The eccentric value is the distance between the circle center of the eccentric arc outer profile and the circle center of the arc inner profile on the eccentric permanent magnet; />
Figure 947296DEST_PATH_IMAGE204
The distance from the middle point of the eccentric arc on the outer rotor iron core 1 to the geometric center of the energy storage flywheel generator; />
Figure 932569DEST_PATH_IMAGE206
The eccentric value is the distance between the center of the eccentric arc on the outer rotor core and the geometric center; />
Figure 304645DEST_PATH_IMAGE208
The outer contour radius of the outer rotor iron core; />
Figure 109790DEST_PATH_IMAGE210
The inner diameter of the tile-shaped magnetism isolating block is +.>
Figure 225513DEST_PATH_IMAGE212
For its outer diameter->
Figure 799714DEST_PATH_IMAGE214
For its opening angle; />
Figure 280374DEST_PATH_IMAGE216
Is the opening angle of the eccentric permanent magnet.
The circle center of the eccentric arc outline on the eccentric permanent magnet is positioned on the connecting line of the midpoint of the arc outline and the circle center, namely O 1 At line segment OH 2 Applying; the two end points A, B of the eccentric arc on the outer rotor core are on the extension line of the connecting line of the middle point C, D of the tile-shaped side of the magnetism isolating block and the geometric center O at the two sides of the corresponding eccentric permanent magnet, namely, A is on the extension line of the line segment OC and B is on the extension line of the line segment OD; the center of the eccentric arc on the outer rotor core is on the opposite extension line of the connecting line of the middle point of the inner contour of the arc edge and the geometric center on the corresponding eccentric permanent magnet 2, namely O 2 The point being located at line segment OH 2 Is positioned on the reverse extension line of the outer rotor iron core and is positioned on the radial outer side of the outline of the outer rotor iron core, namely the connecting line O of the middle point of the eccentric circular arc on the outer rotor iron core and the circle center 2 H 3 Passes through the radial outline of the outer rotor core.
The design-related parameters are as follows:
the tile-shaped inner diameter of the tile-shaped magnetism isolating block is
Figure 915360DEST_PATH_IMAGE218
The relation is satisfied: />
Figure 506878DEST_PATH_IMAGE220
The tile-shaped outer diameter is->
Figure 466744DEST_PATH_IMAGE222
The relation is satisfied:
Figure 180622DEST_PATH_IMAGE224
wherein->
Figure 960359DEST_PATH_IMAGE226
For the radius of the inner rotor core contour +.>
Figure 276940DEST_PATH_IMAGE228
The tile-shaped opening angle of the eccentric permanent magnet is +.>
Figure 91312DEST_PATH_IMAGE230
The relation is satisfied: />
Figure 913774DEST_PATH_IMAGE232
At the same time the tile-shaped opening angle of the eccentric permanent magnet>
Figure 384070DEST_PATH_IMAGE234
Satisfy the relation
Figure 582970DEST_PATH_IMAGE236
Wherein->
Figure 314166DEST_PATH_IMAGE238
The pole pair number of the energy storage flywheel generator is.
The radius of the eccentric arc outline of the eccentric permanent magnet is
Figure 307530DEST_PATH_IMAGE240
And satisfies the relationship:
Figure 983230DEST_PATH_IMAGE242
wherein->
Figure 720242DEST_PATH_IMAGE244
For the magnetic block coefficients, the relation is satisfied:
Figure 243627DEST_PATH_IMAGE246
。
the distance between the eccentric arc outline of the eccentric permanent magnet and the midpoint of the arc outline is an eccentric value
Figure 407893DEST_PATH_IMAGE248
And satisfies the relationship:
Figure 711835DEST_PATH_IMAGE250
。
the distance from the middle point of the eccentric arc on the outer rotor iron core to the geometric center of the energy storage flywheel generator is
Figure 252538DEST_PATH_IMAGE252
The relation is satisfied: />
Figure 695676DEST_PATH_IMAGE254
. The radius of the eccentric arc on the outer rotor core is +.>
Figure 296422DEST_PATH_IMAGE256
The relation is satisfied:
Figure 822081DEST_PATH_IMAGE258
。
the distance between the center of the eccentric arc on the outer rotor iron core and the geometric center of the energy storage flywheel generator is an eccentric value
Figure 166475DEST_PATH_IMAGE260
Satisfy the relation:>
Figure 398873DEST_PATH_IMAGE262
. The radius of the circular outline of the outer rotor core is +.>
Figure 232837DEST_PATH_IMAGE264
Satisfy the relation:>
Figure 183475DEST_PATH_IMAGE266
。
the embodiment uses an inner rotor core outer diameter
Figure 128297DEST_PATH_IMAGE268
58mm, eccentric permanent magnet thickness +.>
Figure 480781DEST_PATH_IMAGE270
5mm, pole pair->
Figure 485646DEST_PATH_IMAGE272
For the hollow cup type sine wave energy storage flywheel generator based on the rotor with the eccentric structure of the permanent magnet and the outer rotor iron core as an example, the magnetism isolating block, the eccentric permanent magnet and the eccentric outer rotor iron core are designed:
from the formula
Figure 392422DEST_PATH_IMAGE274
Obtaining the tile-shaped inner diameter of the magnetism isolating block>
Figure 78619DEST_PATH_IMAGE276
By the formula->
Figure DEST_PATH_IMAGE278
Obtaining the tile-shaped outer diameter of the magnetism isolating block
Figure DEST_PATH_IMAGE280
By the formula->
Figure DEST_PATH_IMAGE282
Dewar type opening angle->
Figure DEST_PATH_IMAGE284
Satisfy->
Figure DEST_PATH_IMAGE286
For easy processing and manufacture, the->
Figure DEST_PATH_IMAGE288
The preferred value is +.>
Figure DEST_PATH_IMAGE290
By the formula->
Figure DEST_PATH_IMAGE292
Obtaining the tile-shaped opening angle of the eccentric permanent magnet 2>
Figure DEST_PATH_IMAGE294
Is->
Figure DEST_PATH_IMAGE296
(28.5°)；
From the formula
Figure DEST_PATH_IMAGE298
Obtaining the radius of the eccentric arc outline of the eccentric permanent magnet>
Figure DEST_PATH_IMAGE300
Satisfy->
Figure DEST_PATH_IMAGE302
For easy processing, add->
Figure DEST_PATH_IMAGE304
Preferably 25mm;
from the formula
Figure DEST_PATH_IMAGE306
Obtaining the distance eccentric value between the center of the eccentric arc outline and the center of the arc edge inner outline on the eccentric permanent magnet 2>
Figure DEST_PATH_IMAGE308
=38mm；
From the formula
Figure 318232DEST_PATH_IMAGE310
Obtaining the distance between the middle point of the eccentric arc on the outer rotor iron core and the geometric center of the energy storage flywheel generator>
Figure 900524DEST_PATH_IMAGE312
Satisfy->
Figure 684809DEST_PATH_IMAGE314
For easy processing, add->
Figure 377958DEST_PATH_IMAGE316
Preferably 70mm;
from the formula
Figure 298510DEST_PATH_IMAGE318
Obtaining the radius of the eccentric arc on the outer rotor core>
Figure 51702DEST_PATH_IMAGE320
Satisfy->
Figure 933070DEST_PATH_IMAGE322
For easy processing, add->
Figure 554545DEST_PATH_IMAGE324
Preferably 26mm;
from the formula
Figure 470548DEST_PATH_IMAGE326
Obtaining the distance between the center of the eccentric arc on the outer rotor core and the geometric center of the energy storage flywheel generator +.>
Figure 522205DEST_PATH_IMAGE328
96mm;
from the formula
Figure 625290DEST_PATH_IMAGE330
Obtaining the radius of the circular outer side of the eccentric outer rotor core>
Figure 925822DEST_PATH_IMAGE332
Satisfy->
Figure 820965DEST_PATH_IMAGE334
For easy processing, add->
Figure DEST_PATH_IMAGE336
The preferred value is 108mm.
Taking a traditional hollow cup type energy storage flywheel generator as a comparative example, the parameters of the energy storage flywheel generator are that the outer rotor has an outer diameter of 108mm, an inner diameter of 70mm and the pole pair number
Figure DEST_PATH_IMAGE338
6, the outer diameter of the inner rotor is 58mm, the outer diameter of the permanent magnet is 63mm, the thickness is 5mm, and the inner diameter is 58mm.
Compared with the traditional hollow cup type energy storage flywheel generator, the air gap magnetic field of the hollow cup type sine wave energy storage flywheel generator is more similar to sine wave. Referring to fig. 7, total Harmonic Distortion (THD) is introduced to evaluate the sine of the air-gap magnetic field waveform, and the air-gap magnetic field waveform is subjected to Fourier decomposition transformation to obtain the amplitude of each order of harmonic according to the formula
Figure DEST_PATH_IMAGE340
The smaller the THD is calculated, the better the sinusoid. As shown in fig. 7, compared with the traditional hollow cup energy storage flywheel generator structure, the THD is reduced from 38.2% to 16.5%, the THD is reduced by 56.8%, and the waveform of the air gap magnetic field is more approximate to sine wave.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (8)

1. The sine wave rotor based on the eccentric structure design of the permanent magnets and the outer rotor iron core comprises an outer rotor iron core, eccentric 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, and the radial inner side of the inner rotor iron core is arranged at the inner end of the rotor shaft;
the circular outline of the outer rotor iron core, the circular arc edge inner outline of the eccentric permanent magnet and the inner outline of the inner rotor iron core are concentrically arranged, the concentric points are the geometric center of the rotor, two end points of the eccentric circular arc on the outer rotor iron core are on extension lines of connecting the two sides of the corresponding eccentric permanent magnet with the geometric center of the rotor, the reverse extension line of the connecting line of the center of the eccentric circular arc on the outer rotor iron core is led out from the middle point of the eccentric circular arc on the outer rotor iron core to pass through the geometric center of the rotor, and the center of the eccentric circular arc on the outer rotor iron core is positioned at the radial outer side of the outer rotor iron core;
the included angle between two side edges of the eccentric permanent magnet is an opening angle alpha, and the relation formula is satisfied:
Figure FDA0004235317000000011
wherein p is the pole pair number, and the radius of the eccentric arc outline of the eccentric permanent magnet is r w2 And satisfies the relationship:
Figure FDA0004235317000000012
，
wherein R is w B is the distance between the middle points of the inner outline of the eccentric permanent magnet;
the distance from the middle point of the eccentric arc on the outer rotor core to the geometric center is R, and the relation is satisfied: r is R w +b+5≤R≤R w +b+8, the radius of the eccentric arc on the outer rotor core is r, and the relation is satisfied:
Figure FDA0004235317000000021
2. the sine wave rotor based on the permanent magnet and outer rotating core eccentric structure design according to claim 1, further comprising tile-shaped magnetism isolating blocks which are equal to the eccentric permanent magnets in number, wherein the magnetism isolating blocks are arranged between two adjacent eccentric permanent magnets, and two end points of an eccentric arc on the outer rotor core are arranged on extension lines of connecting points of tile-shaped edges of the magnetism isolating blocks at two sides of the corresponding eccentric permanent magnets and the geometric center.
3. The sine wave rotor based on the eccentric structure design of the permanent magnet and the outer rotor core according to claim 2, wherein the tile-shaped inner diameter of the magnetism isolating block is r n The relation is satisfied: r is (r) n ＝R w The tile-shaped outer diameter is r n2 The relation is satisfied: r is (r) n2 ＝r n +0.85b, where R w For the radius of the inner rotor core, b is the distance between the middle points of the inner and outer contours of the eccentric permanent magnet, and the tile-shaped opening angle of the magnetism isolating block is alpha n The relation is satisfied:
Figure FDA0004235317000000022
the opening angle alpha of the eccentric permanent magnet meets the relation
Figure FDA0004235317000000023
Where p is the pole pair number.
4. A sine wave rotor based on an eccentric structural design of permanent magnets and outer rotor cores according to claim 3, characterized in that the eccentric permanent magnetsThe radius of the eccentric arc outline of the body is r w2 And satisfies the relationship:
Figure FDA0004235317000000024
，
wherein k is n For the magnetic block coefficients, the relation is satisfied:
Figure FDA0004235317000000031
5. the sine wave rotor based on the eccentric structural design of the permanent magnet and the outer rotor core according to claim 4, wherein the distance from the midpoint of the eccentric arc on the outer rotor core to the geometric center is R, which satisfies the relation: r is R w +b+5≤R≤R w +b+8; the radius of the eccentric arc on the outer rotor core is r, and the relation is satisfied:
Figure FDA0004235317000000032
6. the sine wave rotor based on the eccentric structural design of the permanent magnet and the outer rotor core according to claim 1 or 5, wherein the distance between the center of the eccentric circular arc outline and the center of the circular arc outline on the eccentric permanent magnet is an eccentric value λ, and satisfies the relation: λ=r w +b-r w2 。
7. The sine wave rotor based on the eccentric structure design of permanent magnet and outer rotor core according to claim 6, wherein the distance between the center of the eccentric arc on the outer rotor core and the geometric center is an eccentric value lambda 1 The relation is satisfied: lambda (lambda) 1 R+r, the radius of the circular outline of the outer rotor core is R w The relation is satisfied:
Figure FDA0004235317000000033
8. the sine wave rotor based on the eccentric structural design of the permanent magnet and the outer rotor core according to claim 1 or 2, wherein the number of eccentric arcs on the outer rotor core is i, and the relation is satisfied: i=2p, where p is the pole pair number.
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