CN113541353A - Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure - Google Patents

Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure Download PDF

Info

Publication number
CN113541353A
CN113541353A CN202110625186.XA CN202110625186A CN113541353A CN 113541353 A CN113541353 A CN 113541353A CN 202110625186 A CN202110625186 A CN 202110625186A CN 113541353 A CN113541353 A CN 113541353A
Authority
CN
China
Prior art keywords
eccentric
permanent magnet
iron core
rotor
inner rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110625186.XA
Other languages
Chinese (zh)
Other versions
CN113541353B (en
Inventor
韩坤
苏森
王志强
陈胜林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Huachi Kinetic Energy Technology Co Ltd
Original Assignee
Anhui Huachi Kinetic Energy Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Huachi Kinetic Energy Technology Co Ltd filed Critical Anhui Huachi Kinetic Energy Technology Co Ltd
Priority to CN202110625186.XA priority Critical patent/CN113541353B/en
Publication of CN113541353A publication Critical patent/CN113541353A/en
Application granted granted Critical
Publication of CN113541353B publication Critical patent/CN113541353B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—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

Landscapes

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

Abstract

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 a permanent magnet and an inner rotor iron core; the permanent magnet rotor comprises an outer rotor iron core, eccentric permanent magnets, an inner rotor iron core and a rotor shaft, wherein the eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, each eccentric permanent magnet consists of an arc edge outline, an eccentric arc inner outline and two side edges, the inner outline of the inner rotor iron core is circular and consists of a group of eccentric arcs, and an annular air gap is formed between the radial outer side of the inner rotor iron core and each eccentric permanent magnet; the invention adopts the rotor designed based on the permanent magnet and the inner rotor core eccentric structure, so that the length edges of two side edges of a radial air gap of the flywheel generator are not uniform, the length change of the two side edges of the radial air gap of the air gap is more reasonable, the air gap magnetic density waveform of the flywheel generator is improved, the air gap magnetic field is close to a square wave, the counter electromotive force waveform of the hollow cup type flywheel generator is improved, and the torque pulsation is reduced.

Description

Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure
Technical Field
The invention relates to the technical field of generators, and particularly discloses a square wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor core.
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 granted national invention patent discloses a brushless direct current motor without a stator core, wherein a hollow cup stator structure can be used in the design of the brushless direct current motor, so that an inner eccentric outer rotor core synchronously rotates along with an eccentric permanent magnet, thus the loss can not be generated in the core, and simultaneously, the hollow cup stator enables the stator to be a tooth-slot-free structure, so that the tooth-slot torque and the tooth harmonic can be eliminated; however, the length of the two sides of the air gap in the radial direction of the brushless direct current motor without the stator core is uniform, so that the magnetic resistance of the radial air gap is consistent, the distribution of the air gap magnetic field is influenced, the difference between the waveform of the air gap magnetic field and the square wave is larger, and the performance of a flywheel generator is influenced due to the fact that the eccentric permanent magnets are in direct contact with each other to generate interpolar magnetic leakage. Therefore, aiming at the defects of the traditional square wave energy storage flywheel generator and the existing brushless direct current motor without the stator core, the technical problem to be solved is to design the rotor which can reduce the harmonic content of the air gap magnetic field waveform in the generator and enable the air gap magnetic field waveform to be close to the square wave.
Disclosure of Invention
The invention solves the technical problem of designing a rotor which can reduce the waveform harmonic content of an air gap magnetic field and enable the waveform of the air gap magnetic field to be close to a square wave in a generator aiming at the defects of the traditional square wave energy storage flywheel and the existing brushless direct current motor without a stator core.
The invention is realized by the following technical scheme:
a square wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor iron core comprises an outer rotor iron core, an eccentric permanent magnet, an inner rotor iron core and a rotor shaft, the radial outer side of the outer rotor iron core is arranged at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is arranged at the inner end of the rotor shaft, the eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, the magnetizing directions of two adjacent eccentric permanent magnets are opposite, the eccentric permanent magnets consist of an arc edge outer contour, an eccentric arc inner contour and two side edges, 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 on the inner rotor iron core is the same as that of the eccentric permanent magnets, the positions of the eccentric arcs on the inner rotor iron core correspond to the eccentric permanent magnets one by one, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the eccentric permanent magnets;
the inner outline of the outer rotor iron core, the outline of the eccentric 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, the circle center of the inner outline of the eccentric arc on the eccentric permanent magnet is on the connecting line of the center of the eccentric arc on the eccentric permanent magnet and the geometric center, two end points of the eccentric arc on the iron core of the inner rotor are on the connecting line of the two side edges of the corresponding eccentric permanent magnet and the geometric center, and the connecting line of the center of the eccentric arc on the iron core of the inner rotor and the circle center of the eccentric arc on the inner rotor passes through the geometric center.
As a further arrangement of the above scheme, the distance from the two end points of the eccentric arc on the inner rotor iron core to the geometric center is
Figure 434094DEST_PATH_IMAGE002
And satisfies the relation:
Figure 205741DEST_PATH_IMAGE004
wherein
Figure 94062DEST_PATH_IMAGE006
Is the radius of the inner profile of the outer rotor iron core,
Figure 976568DEST_PATH_IMAGE008
the length of two sides of the eccentric permanent magnet.
As a further arrangement of the above scheme, a distance between a center of an eccentric arc on the inner rotor core and the geometric center is an eccentric value
Figure 516002DEST_PATH_IMAGE010
And satisfies the relation:
Figure 458551DEST_PATH_IMAGE012
wherein
Figure 896485DEST_PATH_IMAGE014
Is the number of pole pairs.
As a further arrangement of the proposal, the radius of the inner contour of the eccentric arc on the eccentric permanent magnet is
Figure 254785DEST_PATH_IMAGE016
And satisfies the relation:
Figure 727355DEST_PATH_IMAGE018
wherein
Figure 27755DEST_PATH_IMAGE020
Is the radius of the inner profile of the outer rotor iron core,
Figure 952986DEST_PATH_IMAGE022
the length of two sides of the eccentric permanent magnet.
The magnetic separation block is arranged between two adjacent eccentric permanent magnets, and two end points of an eccentric arc on the iron core of the inner rotor are positioned on a connecting line of the geometric center and the middle point of the tile-shaped edge of the magnetic separation block on the two sides of the corresponding eccentric permanent magnet.
As a further arrangement of the above scheme, the tile-shaped opening angle of the magnetic isolation block is
Figure 318239DEST_PATH_IMAGE024
And satisfies the relation:
Figure 379736DEST_PATH_IMAGE026
tile-shaped opening angle of the eccentric permanent magnet
Figure 664087DEST_PATH_IMAGE028
Satisfy the relation
Figure 269424DEST_PATH_IMAGE030
Wherein
Figure 297423DEST_PATH_IMAGE032
Is the number of pole pairs.
As a further arrangement of the proposal, the radius of the inner contour of the eccentric circular arc on the eccentric permanent magnet
Figure 479005DEST_PATH_IMAGE034
And satisfies the relation:
Figure 606361DEST_PATH_IMAGE036
wherein
Figure 506184DEST_PATH_IMAGE038
The coefficient of the magnetic isolation block satisfies the relation:
Figure 728087DEST_PATH_IMAGE040
。
as a further arrangement of the above scheme, a distance between a center of an eccentric arc on the inner rotor core and the geometric center is an eccentric value
Figure 295335DEST_PATH_IMAGE042
And satisfies the relation:
Figure 124750DEST_PATH_IMAGE044
。
as the above-mentioned partyThe table is further arranged, and the radius of an eccentric arc on the eccentric inner rotor is
Figure 229978DEST_PATH_IMAGE046
And satisfies the relation:
Figure 803042DEST_PATH_IMAGE048
。
as a further arrangement of the above scheme, the number of the eccentric arcs on the inner rotor core is
Figure 162479DEST_PATH_IMAGE050
And satisfies the relation:
Figure 428376DEST_PATH_IMAGE052
wherein
Figure 755321DEST_PATH_IMAGE054
Is the number of pole pairs.
Has the advantages that:
compared with the traditional flywheel generator, the invention adopts the rotor designed based on the permanent magnet and the inner rotor core eccentric structure, so that the length edges of two side edges of a radial air gap of the flywheel generator are not uniform, the length change of the two side edges of the radial air gap of the flywheel generator is more reasonable, the air gap magnetic density waveform of the flywheel generator is improved, the air gap magnetic field is close to a square wave, the counter electromotive force waveform of the hollow cup type flywheel generator is improved, and the torque pulsation is reduced. Meanwhile, the arrangement of the magnetic isolating blocks can effectively prevent the generation of interpolar magnetic leakage, and the performance of the generator is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a partial schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a schematic diagram showing the comparison between the rotor structure of the square-wave energy-storage flywheel generator of embodiment 1 of the present invention and the air gap field of the conventional hollow cup type energy-storage flywheel generator;
FIG. 4 is a schematic structural view of example 2 of the present invention;
FIG. 5 is a partial structural view of embodiment 2 of the present invention;
fig. 6 is a schematic diagram of the comparison between the square wave flywheel generator rotor structure and the conventional hollow cup type flywheel generator air gap field in embodiment 2 of the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "mounted," "disposed," "provided," "connected," "sleeved," "laid," and the like are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will now be described in detail with reference to the accompanying figures 1-6, in conjunction with an illustrative embodiment.
Example 1
The embodiment 1 discloses a square wave rotor based on permanent magnet and inner rotor core eccentric structure design for a brushless direct current energy storage flywheel generator. Referring to fig. 1 and 2, it includes an outer rotor core 1, an eccentric permanent magnet 2, an inner rotor core 3, and a rotor shaft 4. Both the outer rotor core 1 and the inner rotor core 3 are fixedly connected to the rotor shaft 4 so that the outer rotor core 1 and the inner rotor core 3 rotate together with the rotor shaft 4. When the permanent magnet type permanent magnet rotor is arranged, the radial outer side of the outer rotor iron core 1 is arranged at the outer end of the rotor shaft 4, the eccentric permanent magnets 2 are alternately arranged along the radial inner side of the outer rotor iron core 1, and the magnetizing directions of the two adjacent eccentric permanent magnets 2 are opposite. The radial inner side of the inner rotor iron core 3 is arranged at the inner end of the rotor shaft 4, so that an annular air gap of the energy storage flywheel generator is formed between the radial outer side of the inner rotor iron core 3 and the eccentric permanent magnet 2, the hollow cup stator is arranged in the air gap and fixed on the shell, the structure of the hollow cup stator is consistent with that of the existing hollow cup energy storage flywheel generator, and the structure is not shown and described here. The magnetic flux generated by the eccentric permanent magnet 2 forms a closed loop through the outer rotor core 1 and the inner rotor core 3 and an air gap therebetween.
Wherein, the shape of the outer rotor iron core 1 is circular ring, and the inner diameter thereof
Figure 397655DEST_PATH_IMAGE056
And determining according to the actual working requirement of the brushless direct-current energy storage flywheel generator. The eccentric permanent magnet 2 is composed of an arc edge outline, an eccentric arc inner outline and two side edges. When the energy storage flywheel generator is arranged, the inner outline of the outer rotor iron core 1, the outline of the eccentric permanent magnet 2 and the circular inner outline of the inner rotor iron core 3 are concentrically arranged, and the center point of the circles is used as the geometric center of the energy storage flywheel generator (also the geometric center of the rotor). The circle center of the inner outline of the eccentric arc on the eccentric permanent magnet 2 is positioned on the connecting line of the midpoint and the geometric center of the energy storage flywheel generator, and the lengths of two side edges of the connecting line
Figure 877177DEST_PATH_IMAGE058
The number of the energy storage flywheel generators is determined according to the number of pole pairs.
The inner contour of the inner rotor iron core 3 is circular, the outer contour is formed by a group of eccentric arcs, the number of the eccentric arcs on the inner rotor iron core is consistent with that of the eccentric permanent magnets 2, and the positions of the eccentric arcs correspond to the eccentric permanent magnets 2 one by one. Two end points of an eccentric arc on the inner rotor iron core 3 are on the connecting line of two side edges of the corresponding eccentric permanent magnet 2 and the geometric center of the generator, and meanwhile, the connecting line of the middle point of the eccentric arc on the inner rotor iron core 3 and the circle center passes through the geometric center of the energy storage flywheel generator.
As shown in fig. 2, point O in the figure is the geometric center of the energy storage flywheel generator; h1The point is the midpoint of the profile of the eccentric permanent magnet 2, H2The point is the middle point of the inner contour of the eccentric arc on the eccentric permanent magnet 2, C, D, E is the end points of two side edges of the eccentric permanent magnet 2, O2As the center of the circle; A. the point B is two end points of an eccentric arc on the inner rotor iron core, the point O' is the center of the eccentric arc on the inner rotor iron core, and the point H is the middle point of the eccentric arc on the inner rotor iron core.
Figure 110713DEST_PATH_IMAGE060
The length of the two side edges of the eccentric permanent magnet 2,
Figure 675686DEST_PATH_IMAGE062
the radius of the inner contour of the eccentric arc on the eccentric permanent magnet 2;
Figure 839820DEST_PATH_IMAGE064
the radius of the inner profile of the outer rotor iron core 1;
Figure 173850DEST_PATH_IMAGE066
the radius of an eccentric arc on an inner rotor iron core,
Figure 781548DEST_PATH_IMAGE068
the distance from two end points of an eccentric arc on an inner rotor iron core to the geometric center of the energy storage flywheel generator,
Figure 833818DEST_PATH_IMAGE070
the distance eccentricity value between the center of an eccentric arc on the inner rotor iron core 3 and the geometric center of the energy storage flywheel generator is obtained.
Two end points A, B of the eccentric arc on the inner rotor iron core are on the connecting line of the two sides of the corresponding eccentric permanent magnet 2 and the geometric center O of the energy storage flywheel generator, namely A is on a line segment OC and B is on a line segment OD. The connecting line of the middle point of the eccentric arc on the inner rotor iron core and the center of the circle of the inner rotor iron core passes through the geometric center of the energy storage flywheel generator. That is, the point O is positioned on the line segment O 'H, and the center of the inner contour of the eccentric arc on the eccentric permanent magnet is positioned on the connecting line of the midpoint of the eccentric arc on the inner rotor core and the geometric center of the energy storage flywheel generator, that is, the point O is positioned on the line segment O' H2The point is located on the line segment OH2The above.
The relevant parameters at design are as follows:
1) the radius of the inner contour of the eccentric arc on the eccentric permanent magnet 2 is
Figure 801643DEST_PATH_IMAGE072
And satisfies the relation:
Figure 255758DEST_PATH_IMAGE074
wherein
Figure 831096DEST_PATH_IMAGE076
Which is the radius of the inner profile of the outer rotor core 1,
Figure 370662DEST_PATH_IMAGE078
the length of two side edges of the eccentric permanent magnet 2;
2) the number of the eccentric arcs on the inner rotor iron core 3 is
Figure 892910DEST_PATH_IMAGE080
And satisfies the relation:
Figure 185220DEST_PATH_IMAGE082
wherein
Figure 134721DEST_PATH_IMAGE084
The number of pole pairs of the energy storage flywheel generator is set;
3) from two end points of eccentric arc on inner rotor iron core 3 to geometric center of energy storage flywheel generatorA distance of
Figure 896004DEST_PATH_IMAGE086
And satisfies the relation:
Figure 221943DEST_PATH_IMAGE088
；
4) the distance between the center of an eccentric arc on the inner rotor iron core 3 and the geometric center of the energy storage flywheel generator is an eccentric value
Figure 181809DEST_PATH_IMAGE090
And satisfies the relation:
Figure 551479DEST_PATH_IMAGE092
。
5) the radius of the eccentric arc on the inner rotor iron core 3 is
Figure 800058DEST_PATH_IMAGE094
And satisfies the relation:
Figure 664109DEST_PATH_IMAGE096
。
this embodiment 1 uses an outer rotor inner profile radius
Figure 681743DEST_PATH_IMAGE098
58mm, the length of two side edges of the eccentric permanent magnet
Figure 817972DEST_PATH_IMAGE100
Is 4mm, the number of pole pairs
Figure 350585DEST_PATH_IMAGE102
For 6 brushless direct current energy storage flywheel generator rotor structure based on permanent magnet and inner rotor iron core eccentric structure design rotor as an example, design eccentric permanent magnet and eccentric inner rotor iron core: is composed of
Figure 18326DEST_PATH_IMAGE104
The radius of the inner contour of the eccentric arc on the eccentric permanent magnet 2 is obtained
Figure 890467DEST_PATH_IMAGE106
Satisfy the requirement of
Figure DEST_PATH_IMAGE108
In order to facilitate the processing and the manufacturing,
Figure DEST_PATH_IMAGE110
preferably 25 mm;
is composed of
Figure DEST_PATH_IMAGE112
Obtaining the distance from two end points of an eccentric arc on an inner rotor iron core to the geometric center of the energy storage flywheel generator
Figure DEST_PATH_IMAGE114
Satisfy the requirement of
Figure DEST_PATH_IMAGE116
In order to facilitate the processing and the manufacturing,
Figure DEST_PATH_IMAGE118
preferably 48 mm;
is composed of
Figure DEST_PATH_IMAGE120
Obtaining the distance eccentricity value between the center of the eccentric arc on the inner rotor iron core and the geometric center of the energy storage flywheel generator
Figure DEST_PATH_IMAGE122
Satisfy the requirement of
Figure DEST_PATH_IMAGE124
In order to facilitate the processing and the manufacturing,
Figure DEST_PATH_IMAGE126
preferably 45 mm;
is composed of
Figure DEST_PATH_IMAGE128
The radius of the eccentric arc on the inner rotor iron core is obtained
Figure DEST_PATH_IMAGE130
And 92.2 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 58mm, and the number of pole pairs
Figure DEST_PATH_IMAGE132
6 pairs, the outer diameter of the inner rotor is 48mm, the outer diameter of the permanent magnet is 58mm, the thickness is 4mm, and the inner diameter is 54 mm. Compared with the traditional hollow cup type energy storage flywheel generator, the brushless direct current energy storage flywheel generator based on the eccentric structural design of the inner rotor iron core and the permanent magnet has the advantages that the air gap magnetic field of the rotor structure is closer to a square wave. Referring to FIG. 3, the square wave was evaluated in the flat top ratio
Figure DEST_PATH_IMAGE134
Push-press type
Figure DEST_PATH_IMAGE136
Is calculated, wherein
Figure DEST_PATH_IMAGE138
Is the part above 98% of the maximum value of the air-gap magnetic field in one period of the air-gap waveform,
Figure DEST_PATH_IMAGE140
the invention has the air gap waveform with half cycle width, compared with the structure of the traditional hollow cup energy storage flywheel generator
Figure DEST_PATH_IMAGE142
The lifting rate is increased from 44.48% to 65.13%, and the lifting rate is increased by 46.4%.
Example 2
The embodiment 2 discloses a square wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor core and used in a square wave flywheel generator. Referring to fig. 4 and 5, which include an outer rotor core 1, an eccentric permanent magnet 2, a magnet-separation block 5, an inner rotor core 3, and a rotor shaft 4, the outer rotor core 1 and the inner rotor core 3 are both fixedly coupled to the rotor shaft 4, so that the outer rotor core 1 and the inner rotor core 3 rotate together with the rotor shaft 4. When the permanent magnet type permanent magnet rotor is arranged, the radial outer side of the outer rotor iron core 1 is arranged at the outer end of the rotor shaft 4, the eccentric permanent magnets 2 are alternately arranged along the radial inner side of the outer rotor iron core 1, and the magnetizing directions of the two adjacent eccentric permanent magnets 2 are opposite. The magnetic isolation blocks 5 are tile-shaped and are arranged between two adjacent eccentric permanent magnets 2, and the number of the magnetic isolation blocks is the same as that of the eccentric permanent magnets 2. The radial inner side of the inner rotor iron core 3 is arranged at the inner end of the rotor shaft 4, so that an annular air gap of the flywheel generator is formed between the radial outer side of the inner rotor iron core 3 and the eccentric permanent magnet 2, the hollow cup stator is arranged in the air gap and fixed on the shell, the structure of the hollow cup stator is consistent with that of the existing hollow cup energy storage flywheel generator, and the structure is not shown and described here. The magnetic flux generated by the eccentric permanent magnet 2 forms a closed loop through the outer rotor core 1 and the inner rotor core 3 and an air gap therebetween.
Wherein, the shape of the outer rotor iron core 1 is circular ring, and the inner diameter thereof
Figure DEST_PATH_IMAGE144
And determining according to the actual working requirement of the square wave flywheel generator. The eccentric permanent magnet 2 is composed of an arc edge outline, an eccentric arc inner outline and two side edges. When the flywheel generator is arranged, the inner contour of the outer rotor core 1, the contour of the eccentric permanent magnet 2, and the circular inner contour of the inner rotor core 3 are concentrically arranged, and the center point of the circle is used as the geometric center of the flywheel generator (also the geometric center of the rotor). The circle center of the inner outline of the eccentric arc on the eccentric permanent magnet 2 is positioned on the connecting line of the midpoint and the geometric center of the square wave flywheel generator, and the lengths of two side edges of the connecting line
Figure DEST_PATH_IMAGE146
The number of the energy storage flywheel generators is determined according to the number of pole pairs.
The inner contour of the inner rotor iron core 3 is circular, the outer contour is formed by a group of eccentric arcs, the number of the eccentric arcs on the inner rotor iron core is consistent with that of the eccentric permanent magnets 2, and the positions of the eccentric arcs correspond to the eccentric permanent magnets 2 one by one. Two end points of an eccentric arc on the inner rotor iron core 3 are positioned on a connecting line of the center point of the tile-shaped edges of the magnetic isolating blocks 5 at two sides of the corresponding eccentric permanent magnet 2 and the geometric center of the square wave flywheel generator, and meanwhile, a connecting line of the center point of the eccentric arc on the inner rotor iron core 3 and the center of the circle passes through the geometric center of the square wave flywheel generator.
As shown in FIG. 5, point O is the geometric center of the flywheel generator; h1The point is the midpoint of the profile of the eccentric permanent magnet 2, H2The point is the middle point of the inner contour of the eccentric arc on the eccentric permanent magnet 2, O2As the center of the circle; A. b, two points are two end points of an eccentric arc on the inner rotor iron core, O' point is the center of the eccentric arc on the inner rotor iron core, and H point is the middle point of the eccentric arc on the inner rotor iron core; C. d, E is the middle point of the tile-shaped edge of the magnetic isolation blocks at two sides of the eccentric permanent magnet 2;
Figure DEST_PATH_IMAGE148
the length of the two side edges of the eccentric permanent magnet 2,
Figure DEST_PATH_IMAGE150
the radius of the inner contour of an eccentric arc on the eccentric permanent magnet;
Figure DEST_PATH_IMAGE152
the radius of the inner profile of the outer rotor iron core 1;
Figure DEST_PATH_IMAGE154
the radius of an eccentric arc on the inner rotor iron core;
Figure DEST_PATH_IMAGE156
the distance from two end points of an eccentric arc on an inner rotor iron core to the geometric center of the flywheel generator,
Figure DEST_PATH_IMAGE158
the distance eccentricity value between the center of an eccentric arc on the inner rotor iron core and the geometric center of the flywheel generator is obtained;
Figure DEST_PATH_IMAGE160
is the inner diameter of the tile-shaped magnetic isolating block 5,
Figure DEST_PATH_IMAGE162
the outer diameter of the tube is the same as the diameter of the tube,
Figure DEST_PATH_IMAGE164
is its opening angle;
Figure DEST_PATH_IMAGE166
is the opening angle of the eccentric permanent magnet 2.
Two end points A, B of the eccentric arc on the inner rotor iron core are on the connecting line of the middle point C, D of the 5-watt-shaped edge of the magnetic isolating block at two sides of the corresponding eccentric permanent magnet 2 and the geometric center O of the flywheel generator, namely A is on a line segment OC and B is on a line segment OD. The connecting line of the middle point of the eccentric arc on the inner rotor iron core and the center of the circle of the inner rotor iron core passes through the geometric center of the flywheel generator. That is, the point O is positioned on the line segment O' H, the center of the inner contour of the eccentric arc on the eccentric permanent magnet 2 is positioned on the connecting line of the midpoint of the eccentric arc on the inner rotor core and the geometric center of the flywheel generator, that is, the point O2The point is located on the line segment OH2The above.
The relevant parameters at design are as follows:
1) the tile-shaped outer diameter of the magnetic isolation block is
Figure DEST_PATH_IMAGE168
And satisfies the relation:
Figure 417919DEST_PATH_IMAGE170
the tile-shaped inner diameter is
Figure 641090DEST_PATH_IMAGE172
And satisfies the relation:
Figure 846944DEST_PATH_IMAGE174
wherein
Figure 635908DEST_PATH_IMAGE176
Is the radius of the inner profile of the outer rotor iron core,
Figure 783862DEST_PATH_IMAGE178
the length of two side edges of the eccentric permanent magnet is that the tile-shaped opening angle is
Figure 228749DEST_PATH_IMAGE180
And satisfies the relation:
Figure 238294DEST_PATH_IMAGE182
tile-shaped opening angle of eccentric permanent magnet
Figure 85027DEST_PATH_IMAGE184
Satisfy the relation
Figure 138302DEST_PATH_IMAGE186
Wherein
Figure 336066DEST_PATH_IMAGE188
The number of pole pairs of the flywheel generator is;
2) the radius of the inner contour of the eccentric arc on the eccentric permanent magnet is
Figure 883722DEST_PATH_IMAGE190
And satisfies the relation:
Figure 850541DEST_PATH_IMAGE192
wherein
Figure 622187DEST_PATH_IMAGE194
The coefficient of the magnetic isolation block satisfies the relation:
Figure 556514DEST_PATH_IMAGE196
。
3) the number of the eccentric arcs on the inner rotor iron core is
Figure 907861DEST_PATH_IMAGE198
And satisfies the relation:
Figure 729187DEST_PATH_IMAGE200
。
4) the distance from two end points of the eccentric arc on the inner rotor iron core to the geometric center of the flywheel generator is
Figure 874997DEST_PATH_IMAGE202
And satisfies the relation:
Figure 31041DEST_PATH_IMAGE204
。
5) the distance between the center of an eccentric arc on the inner rotor iron core and the geometric center of the flywheel generator is an eccentric value
Figure 920500DEST_PATH_IMAGE206
And satisfies the relation:
Figure 658648DEST_PATH_IMAGE208
6) the radius of the eccentric arc on the inner rotor core is
Figure 975360DEST_PATH_IMAGE210
And satisfies the relation:
Figure 369433DEST_PATH_IMAGE212
。
this embodiment 2 uses an outer rotor inner profile radius
Figure 311850DEST_PATH_IMAGE214
85mm, the length of two side edges of the eccentric permanent magnet
Figure 107767DEST_PATH_IMAGE216
5.5mm, number of pole pairs
Figure 595380DEST_PATH_IMAGE218
For example, the rotor structure of the square wave flywheel generator designed for the permanent magnet and inner rotor core eccentric structure of 6 is designed for the magnetic isolation block, the eccentric permanent magnet and the eccentric inner rotor core:
is composed of
Figure 476749DEST_PATH_IMAGE220
Obtaining the tile-shaped outer diameter of the magnetic separation block
Figure 957278DEST_PATH_IMAGE222
Is 85mm, is represented by
Figure 404439DEST_PATH_IMAGE224
To obtain a tile-shaped inner diameter
Figure 328533DEST_PATH_IMAGE226
80.325mm, is represented by the formula
Figure 697197DEST_PATH_IMAGE228
Dewar tile type opening angle
Figure 732150DEST_PATH_IMAGE230
Satisfy the requirement of
Figure 220769DEST_PATH_IMAGE232
In order to facilitate the processing and the manufacturing,
Figure 315764DEST_PATH_IMAGE234
preferably takes on a value of
Figure 968462DEST_PATH_IMAGE236
Is of the formula
Figure 541526DEST_PATH_IMAGE238
Calculating tile-shaped opening angle of eccentric permanent magnet
Figure 166542DEST_PATH_IMAGE240
Is composed of
Figure 675846DEST_PATH_IMAGE242
(28.5°)；
Is composed of
Figure 753524DEST_PATH_IMAGE244
The radius of the inner contour of the eccentric arc of the eccentric permanent magnet 2 is obtained
Figure 130279DEST_PATH_IMAGE246
Satisfy the requirement of
Figure 609801DEST_PATH_IMAGE248
In order to facilitate the processing and the manufacturing,
Figure 295867DEST_PATH_IMAGE250
preferably 40 mm;
is composed of
Figure 657578DEST_PATH_IMAGE252
Obtaining the distance from two end points of the eccentric arc on the inner rotor iron core to the geometric center of the flywheel generator
Figure 572444DEST_PATH_IMAGE254
Satisfy the requirement of
Figure 703211DEST_PATH_IMAGE256
In order to facilitate the processing and the manufacturing,
Figure 842069DEST_PATH_IMAGE258
preferably 75 mm;
is composed of
Figure 363180DEST_PATH_IMAGE260
Obtaining the distance eccentricity value between the center of the eccentric arc on the inner rotor iron core and the geometric center of the flywheel generator
Figure 612895DEST_PATH_IMAGE262
Satisfy the requirement of
Figure 785120DEST_PATH_IMAGE264
In order to facilitate the processing and the manufacturing,
Figure 94878DEST_PATH_IMAGE262
preferably 50 mm;
is composed of
Figure 103286DEST_PATH_IMAGE266
The radius of the eccentric arc on the inner rotor iron core is obtained
Figure 156692DEST_PATH_IMAGE268
123.97 mm.
The traditional hollow cup type flywheel generator is taken as a comparative example, and the parameters of the flywheel generator are that the inner diameter of the outer rotor is 85mm, and the number of pole pairs
Figure 996472DEST_PATH_IMAGE270
The outer diameter of the inner rotor is 75mm, the outer diameter of the permanent magnet is 85mm, the thickness is 5.5mm, and the inner diameter is 79.5 mm. Compared with the traditional hollow cup type flywheel generator, the square wave flywheel generator rotor structure air gap magnetic field designed based on the eccentric structure of the inner rotor iron core and the permanent magnet is closer to a square wave. As shown in FIG. 6, the square wave evaluation method is flat top ratio
Figure 664083DEST_PATH_IMAGE272
Push-press type
Figure 956524DEST_PATH_IMAGE274
Is calculated, wherein
Figure 751305DEST_PATH_IMAGE276
Is the part above 98% of the maximum value of the air-gap magnetic field in one period of the air-gap waveform,
Figure DEST_PATH_IMAGE278
the invention has the air gap waveform with half cycle width, compared with the structure of the traditional hollow cup flywheel generator
Figure DEST_PATH_IMAGE280
The yield is increased from 45.58% to 68.42% and is increased by 50.1%.
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.

Claims (10)

1. A square wave rotor designed based on an eccentric structure of a permanent magnet and an inner rotor iron core comprises an outer rotor iron core, an eccentric permanent magnet, an inner rotor iron core and a rotor shaft, the radial outer side of the outer rotor iron core is arranged at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is arranged at the inner end of the rotor shaft, it is characterized in that a plurality of eccentric permanent magnets are alternately arranged along the radial inner side of the outer rotor iron core, the magnetizing directions of two adjacent eccentric permanent magnets are opposite, the eccentric permanent magnets consist of an arc edge outer contour, an eccentric arc inner contour and two side edges, 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 on the inner rotor iron core is the same as that of the eccentric permanent magnets, the positions of the eccentric arcs on the inner rotor iron core correspond to the eccentric permanent magnets one by one, and an annular air gap is formed between the radial outer side of the inner rotor iron core and the eccentric permanent magnets;
the inner outline of the outer rotor iron core, the outline of the eccentric 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, the circle center of the inner outline of the eccentric arc on the eccentric permanent magnet is on the connecting line of the center of the eccentric arc on the eccentric permanent magnet and the geometric center, two end points of the eccentric arc on the iron core of the inner rotor are on the connecting line of the two side edges of the corresponding eccentric permanent magnet and the geometric center, and the connecting line of the center of the eccentric arc on the iron core of the inner rotor and the circle center of the eccentric arc on the inner rotor passes through the geometric center.
2. The square-wave rotor designed based on the permanent magnet and the eccentric structure of the inner rotor core as claimed in claim 1, wherein the distance from the geometric center to two end points of the eccentric arc on the inner rotor core is
Figure DEST_PATH_IMAGE001
And satisfies the relation:
Figure 524334DEST_PATH_IMAGE002
wherein
Figure DEST_PATH_IMAGE003
Is the radius of the inner profile of the outer rotor iron core,
Figure 379158DEST_PATH_IMAGE004
the length of two sides of the eccentric permanent magnet.
3. The square-wave rotor designed based on the permanent magnet and the inner rotor core eccentric structure as claimed in claim 2, wherein the distance between the center of the eccentric arc and the geometric center of the inner rotor core is an eccentric value
Figure DEST_PATH_IMAGE005
And satisfies the relation:
Figure 345846DEST_PATH_IMAGE006
wherein
Figure DEST_PATH_IMAGE007
Is the number of pole pairs.
4. The square-wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core as claimed in claim 3, wherein the radius of the inner profile of the eccentric arc of the eccentric permanent magnet is set to be
Figure 944317DEST_PATH_IMAGE008
And satisfies the relation:
Figure DEST_PATH_IMAGE009
wherein
Figure 680061DEST_PATH_IMAGE010
Is the radius of the inner profile of the outer rotor iron core,
Figure DEST_PATH_IMAGE011
the length of two sides of the eccentric permanent magnet.
5. The square-wave rotor designed based on the permanent magnets and the inner rotor core eccentric structure as claimed in claim 2, further comprising tile-shaped magnetic isolation blocks with the same number as the eccentric permanent magnets, wherein the magnetic isolation blocks are arranged between two adjacent eccentric permanent magnets, and two end points of the eccentric arc on the inner rotor core are located on a connecting line between the geometric center and the middle point of the tile-shaped edge of the magnetic isolation block on the two sides of the corresponding eccentric permanent magnet.
6. The square-wave rotor designed based on the eccentric structures of the permanent magnet and the inner rotor core as claimed in claim 5, wherein the tile-shaped opening angle of the magnet isolating block is
Figure 440206DEST_PATH_IMAGE012
And satisfies the relation:
Figure DEST_PATH_IMAGE013
opening angle of the eccentric permanent magnet
Figure 159770DEST_PATH_IMAGE014
Satisfy the relation
Figure 561932DEST_PATH_IMAGE015
Wherein
Figure 230811DEST_PATH_IMAGE016
Is the number of pole pairs.
7. The square-wave rotor designed based on the eccentric structures of the permanent magnets and the inner rotor core as claimed in claim 6, wherein the radius of the inner profile of the eccentric arc of the eccentric permanent magnet is larger than that of the inner profile of the eccentric arc of the eccentric permanent magnet
Figure 411125DEST_PATH_IMAGE017
And satisfies the relation:
Figure 165455DEST_PATH_IMAGE018
wherein
Figure 840150DEST_PATH_IMAGE019
The coefficient of the magnetic isolation block satisfies the relation:
Figure 363535DEST_PATH_IMAGE020
。
8. the square-wave rotor designed based on the permanent magnet and the inner rotor core eccentric structure as claimed in claim 7, wherein the distance between the center of the eccentric arc and the geometric center of the inner rotor core is an eccentric value
Figure 793379DEST_PATH_IMAGE021
And satisfies the relation:
Figure 221955DEST_PATH_IMAGE022
。
9. the square-wave rotor designed based on the eccentric structures of the permanent magnet and the inner rotor core according to claim 4 or 8, wherein the radius of the eccentric arc on the eccentric inner rotor is
Figure 497079DEST_PATH_IMAGE023
And satisfies the relation:
Figure 78233DEST_PATH_IMAGE024
。
10. the square-wave rotor designed based on the permanent magnet and the inner rotor core eccentric structure as claimed in claim 1 or 5, wherein the number of the eccentric arcs on the inner rotor core is
Figure 413399DEST_PATH_IMAGE025
And satisfies the relation:
Figure 329272DEST_PATH_IMAGE026
wherein
Figure 408086DEST_PATH_IMAGE027
Is the number of pole pairs.
CN202110625186.XA 2021-06-04 2021-06-04 Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure Active CN113541353B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110625186.XA CN113541353B (en) 2021-06-04 2021-06-04 Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110625186.XA CN113541353B (en) 2021-06-04 2021-06-04 Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure

Publications (2)

Publication Number Publication Date
CN113541353A true CN113541353A (en) 2021-10-22
CN113541353B CN113541353B (en) 2022-06-14

Family

ID=78095139

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110625186.XA Active CN113541353B (en) 2021-06-04 2021-06-04 Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure

Country Status (1)

Country Link
CN (1) CN113541353B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5097162A (en) * 1989-09-26 1992-03-17 North American Philips Corporation Variable angle stepper motor with spring magnet
CN1707921A (en) * 2004-12-30 2005-12-14 北京航空航天大学 Non-stator iron core brushless DC motor
JP2007124742A (en) * 2005-10-25 2007-05-17 Yaskawa Electric Corp Rotor with permanent magnet, and motor using the same
CN101635496A (en) * 2008-07-25 2010-01-27 张玉宝 Use method of outer rotor reluctance motor, optical-mechanical-electrical integrated control system and three-phase alternating current
CN106165259A (en) * 2014-04-08 2016-11-23 三菱电机株式会社 Permanent magnet submerged type electric rotating machine
CN108736607A (en) * 2018-05-10 2018-11-02 天津大学 A kind of magnetic field modulation wave-activated generator with permanent magnet eccentric structure
CN112865459A (en) * 2021-04-12 2021-05-28 北京航空航天大学 Hollow cup structure motor with arc permanent magnet

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5097162A (en) * 1989-09-26 1992-03-17 North American Philips Corporation Variable angle stepper motor with spring magnet
CN1707921A (en) * 2004-12-30 2005-12-14 北京航空航天大学 Non-stator iron core brushless DC motor
JP2007124742A (en) * 2005-10-25 2007-05-17 Yaskawa Electric Corp Rotor with permanent magnet, and motor using the same
CN101635496A (en) * 2008-07-25 2010-01-27 张玉宝 Use method of outer rotor reluctance motor, optical-mechanical-electrical integrated control system and three-phase alternating current
CN106165259A (en) * 2014-04-08 2016-11-23 三菱电机株式会社 Permanent magnet submerged type electric rotating machine
CN108736607A (en) * 2018-05-10 2018-11-02 天津大学 A kind of magnetic field modulation wave-activated generator with permanent magnet eccentric structure
CN112865459A (en) * 2021-04-12 2021-05-28 北京航空航天大学 Hollow cup structure motor with arc permanent magnet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
殷明等: "双圈磁钢飞轮电机的设计及优化", 《飞控与探测》 *

Also Published As

Publication number Publication date
CN113541353B (en) 2022-06-14

Similar Documents

Publication Publication Date Title
CN104578493B (en) Rotary type permanent-magnet motor and use its compressor
US20130181551A1 (en) Permanent magnet rotor with flux concentrating pole pieces
CN106787562A (en) Alternately pole, mixed excitation directly drives vernier motor
CN110224563B (en) Three-phase magnetic-gathering bilateral passive rotor transverse flux permanent magnet motor
US20220166269A1 (en) Synchronous reluctance motor
CN101980433A (en) Wedge-shaped stator core outer permanent-magnetic synchronous motor of circumferential phase shift and axial segmentation
CN115001229A (en) Whole-pitch winding axial flux switched reluctance motor and multi-target optimization method thereof
CN110601481A (en) Birotor permanent magnet synchronous reluctance motor and configuration method
CN204858923U (en) A directly drive formula permanent magnetism AC servo motor for forging press
CN104184291B (en) Two half 4 pole asynchronous starting permanent magnet synchronous motors and pole-changing windings method
CN211830364U (en) Synchronous motor with permanent magnet reluctance hybrid rotor structure
CN210350986U (en) Birotor permanent magnet synchronous reluctance motor
CN113541353B (en) Square wave rotor designed based on permanent magnet and inner rotor core eccentric structure
CN110492708B (en) Laminated vernier motor
CN208924074U (en) A kind of brushless, permanently double-rotor machine
CN113541351A (en) Sine wave rotor designed based on permanent magnet and outer rotor iron core eccentric structure
CN113541350B (en) Square wave rotor designed based on inner rotor iron core eccentric structure
CN109286255A (en) A kind of alternating pole permanent magnetism vernier motor based on T-type permanent magnet
CN114899957A (en) Design method of three-phase split-tooth permanent magnet vernier motor
CN113541355B (en) Square wave rotor designed based on outer rotor core eccentric structure
CN113541349B (en) Sine wave rotor designed based on outer rotor iron core eccentric structure
CN201846213U (en) Peripherally phase-shifting and axially sectioning synchronous motor with wedge-shaped stator iron core and outer permanent-magnetic rotor
CN209402269U (en) The rotor of vehicle, disc type electric machine and disc type electric machine
CN113541352B (en) Square wave rotor based on permanent magnet and outer rotor core eccentric structure design
CN113328544A (en) Rotor structure with eccentric inner rotor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant