CN113541355B - Square wave rotor designed based on outer rotor core eccentric structure - Google Patents

Square wave rotor designed based on outer rotor core eccentric structure Download PDF

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Publication number
CN113541355B
CN113541355B CN202110625200.6A CN202110625200A CN113541355B CN 113541355 B CN113541355 B CN 113541355B CN 202110625200 A CN202110625200 A CN 202110625200A CN 113541355 B CN113541355 B CN 113541355B
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iron core
rotor
eccentric
rotor iron
relation
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CN113541355A (en
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苏森
韩坤
王志强
陈胜林
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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

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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 generators or motors, and particularly discloses a square wave rotor designed based on an outer rotor iron core eccentric structure; the permanent magnet magnetizing device comprises an outer rotor iron core, permanent magnets, a stator, an inner rotor iron core and a rotor shaft, wherein the radial outer side of the outer rotor iron core is arranged at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is arranged at the inner end of the rotor shaft, the permanent magnets are tile-shaped, a plurality of permanent magnets are alternately arranged along the radial outer side of the inner rotor iron core, the magnetizing directions of two adjacent permanent magnets are opposite, the outer contour of the outer rotor iron core is circular, the inner contour of the outer rotor iron core is formed by a plurality of circumferential eccentric circular arcs, the number of the eccentric circular arcs is the same as that of the permanent magnets, and an annular air gap is formed between the radial inner side of the outer rotor iron core and the permanent magnets; the invention adopts the eccentric structure design of the outer rotor iron core, effectively improves the air gap flux density waveform of the motor, and leads the air gap magnetic field to be close to square waves, thereby improving the counter electromotive force waveform of the motor or the generator, reducing the torque pulsation and improving the motor performance.

Description

Square wave rotor designed based on outer rotor core eccentric structure
Technical Field
The invention relates to the technical field of generators or motors, and particularly discloses a square wave rotor designed based on an outer rotor iron core eccentric structure.
Background
The traditional square wave motor is mostly applied to low-rotating-speed and high-load occasions and is driven and controlled by square wave phase current, and the square wave phase current needs to interact with the opposite electromotive force of a square wave so as to reduce electromagnetic torque pulsation; the traditional hollow cup type square wave motor has larger difference between the waveform of the back electromotive force and the square wave, so that the motor generates electromagnetic torque pulsation to influence the performance and the efficiency of the motor. Similarly, the traditional energy storage flywheel brushless direct current generator is also mostly applied to low-rotating-speed and high-load occasions, and is mostly driven and controlled by square-wave phase current, and the square-wave phase current needs to interact with the opposite electromotive force of the square wave so as to reduce electromagnetic torque pulsation; the traditional brushless direct current generator with the energy storage flywheel has larger difference between the waveform of back electromotive force and square waves, so that the generator generates electromagnetic torque pulsation to influence the performance and efficiency of the generator. Therefore, the optimization of the internal rotor structure of the motor or the generator and the reduction of the harmonic content of the air-gap magnetic field waveform are important to enable the air-gap magnetic field waveform to be close to a square wave.
The invention with the application number of 2004101018988 discloses a brushless direct current motor without a stator core, wherein a stator structure without a laminated core can be used in the design of the brushless direct current motor, so that an inner rotor and an outer rotor share a circular arc variable air gap core to synchronously rotate along with a permanent magnet, thereby generating no loss in the core, and meanwhile, the stator without the laminated core is of a structure without a tooth slot, which can eliminate the tooth slot torque and the tooth harmonic wave, but the brushless direct current motor without the stator core has the same radial thickness of an air gap, so that the magnetic resistance of the radial air gap is consistent, the distribution of an air gap magnetic field is influenced, the difference between the air gap magnetic field waveform and an ideal square wave is larger, and the performance of the motor or a generator is influenced; in addition, since the plurality of permanent magnets in the rotor are in direct contact with each other, inter-pole leakage flux is generated, and the performance of the generator or the motor is also affected to some extent.
Disclosure of Invention
The invention solves the technical problem of overcoming the problem of performance of a motor or a generator caused by large difference between a back electromotive force waveform and a square wave in the prior art, and provides a square wave rotor designed based on an outer rotor iron core eccentric structure, which is used for solving the problems of large difference between an air gap magnetic field waveform and the square wave and magnetic leakage between poles.
The invention is realized by the following technical scheme:
a square wave rotor based on an outer rotor iron core eccentric structure design comprises an outer rotor iron core, permanent magnets, a stator, an inner rotor iron core and a rotor shaft, wherein the radial outer side of the outer rotor iron core is arranged at the outer end of the rotor shaft, the radial inner side of the inner rotor iron core is arranged at the inner end of the rotor shaft, a plurality of tile-shaped permanent magnets are alternately arranged along the radial outer side of the inner rotor iron core, the magnetizing directions of two adjacent permanent magnets are opposite, the outer contour of the outer rotor iron core is circular, the inner contour of the outer rotor iron core is formed by a plurality of circumferential outwards-recessed eccentric arcs, the number of the eccentric arcs is the same as that of the permanent magnets, the positions of the eccentric arcs correspond to the permanent magnets one by one, an annular air gap is formed between the radial inner side of the outer rotor iron core and the permanent magnets, and the stator is arranged in the annular air gap and fixed on a machine shell;
the circular outline of the outer rotor iron core, the inner outline and the outer outline of the permanent magnet and the inner outline and the outer outline of the inner rotor iron core are arranged concentrically, the concentric point is the geometric center of the rotor, two end points of the eccentric arc are positioned on an extension line of connecting lines of two corresponding side edges of the permanent magnet and the geometric center of the rotor, and the circle center of the eccentric arc is positioned on a connecting line of the middle point of the eccentric arc and the geometric center of the rotor.
As a further configuration of the above solution, the distance from the two end points of the eccentric arc to the geometric center is
Figure 100002_DEST_PATH_IMAGE002
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE004
。
as a further configuration of the above scheme, the distance between the center of the eccentric arc and the geometric center of the rotor is an eccentric value
Figure 100002_DEST_PATH_IMAGE006
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE008
wherein
Figure 100002_DEST_PATH_IMAGE010
Is the radius of the profile of the inner rotor core,
Figure 100002_DEST_PATH_IMAGE012
is the radius of the outer contour of the outer rotor iron core,
Figure 100002_DEST_PATH_IMAGE014
is the thickness of the permanent magnet or magnets,
Figure 100002_DEST_PATH_IMAGE016
is the number of pole pairs.
The magnetic isolation device is characterized by further comprising tile-shaped magnetic isolation blocks with the same number as the permanent magnets, wherein the magnetic isolation blocks are arranged between two adjacent permanent magnets, and two end points of the eccentric arc are positioned on an extension line of connecting lines of the edges of the tile-shaped magnetic isolation blocks on two sides of the corresponding permanent magnet and the geometric center of the rotor.
As a further arrangement of the proposal, the tile-shaped inner diameter of the magnetic isolation block is
Figure 100002_DEST_PATH_IMAGE018
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE020
the tile-shaped outer diameter of the magnetic isolating block is
Figure 100002_DEST_PATH_IMAGE022
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE024
wherein
Figure 100002_DEST_PATH_IMAGE026
Is the radius of the profile of the inner rotor core,
Figure 100002_DEST_PATH_IMAGE028
is the thickness of the permanent magnet.
As a further arrangement of the proposal, the tile-shaped field angle of the magnetic isolation block is
Figure 100002_DEST_PATH_IMAGE030
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE032
the tile-shaped opening angle of the permanent magnet is
Figure 100002_DEST_PATH_IMAGE034
Satisfy the relation
Figure 100002_DEST_PATH_IMAGE036
In which
Figure 100002_DEST_PATH_IMAGE038
Is a pole pair number.
As a further configuration of the above scheme, the distance between the center of the eccentric arc and the geometric center is an eccentric value
Figure 100002_DEST_PATH_IMAGE040
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE042
wherein
Figure 100002_DEST_PATH_IMAGE044
Is the radius of the outer contour of the outer rotor iron core,
Figure 100002_DEST_PATH_IMAGE046
is a magnetic isolation block coefficient and satisfies the relation:
Figure 100002_DEST_PATH_IMAGE048
。
as a further arrangement of the above solution, the radius of the eccentric arc is
Figure 100002_DEST_PATH_IMAGE050
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE052
。
in a further aspect of the present invention, the number of the eccentric arcs on the outer rotor core is set to
Figure 100002_DEST_PATH_IMAGE054
And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE056
。
has the advantages that:
1) The generator disclosed by the invention adopts the square wave rotor designed based on the outer rotor iron core eccentric structure, and compared with the traditional coreless permanent magnet generator, the radial air gap thickness of the generator is not uniform along the circumference, so that the air gap flux density waveform of the generator is improved, the air gap flux density is close to the square wave, the back electromotive force waveform of the energy storage flywheel generator is improved, the torque pulsation is reduced, and the performance of the generator is improved. In a similar way, compared with the traditional coreless permanent magnet motor, the motor of the square-wave rotor designed based on the outer rotor core eccentric structure has the advantages that the thickness of the radial air gap of the motor is uneven, the change of the radial thickness of the air gap is more reasonable, the air gap flux density waveform of the motor is improved, the air gap magnetic field is close to the square wave, the counter electromotive force waveform of the coreless motor is improved, the torque pulsation is reduced, and the performance of the motor is improved.
2) Compared with the traditional motor or generator, the permanent magnet generator 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. In addition, the permanent magnets are separated by the magnetic separation blocks, so that the magnetic loops generated on the side edges of the permanent magnets are reduced, the interpolar magnetic leakage is reduced, and the performance of the motor or the generator is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a partial schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a comparison of the air gap field of the flywheel brushless DC generator of embodiment 1 of the present invention and the conventional energy storage flywheel generator;
FIG. 4 is a schematic structural view of example 2 of the present invention;
FIG. 5 is a partial structural view of embodiment 2 of the present invention;
fig. 6 is a schematic diagram showing a comparison of the air gap field of the hollow-cup type square-wave flywheel motor according to embodiment 2 of the present invention and the air gap field of the conventional hollow-cup type motor.
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", "laid" and the like should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will now be described in detail with reference to the accompanying figures 1-6, in conjunction with an illustrative embodiment.
Example 1
Embodiment 1 discloses a square wave rotor designed based on an eccentric structure of an outer rotor core, and the square wave rotor is used in a flywheel brushless direct current generator. Referring to fig. 1 and 2, the entire rotor main body part includes an outer rotor core 1, a permanent magnet 2, a non-laminated core stator 3, an inner rotor core 4, and a rotor shaft 5. The outer rotor core 1 and the inner rotor core 4 are both fixedly connected to the rotor shaft 5, so that the outer rotor core 1 and the inner rotor core 4 rotate together with the rotor shaft 5. In the specific arrangement, the radial outer side of the outer rotor core 1 is mounted on the outer end of the rotor shaft 5, and the radial inner side of the inner rotor core 4 is mounted in the rotor shaft 5And (4) an end. The radial outer side of the inner rotor iron core 4 is provided with a permanent magnet 2, and the permanent magnet 2 is in a tile shape and has thickness
Figure 100002_DEST_PATH_IMAGE058
The number of the pole pairs is determined according to the actual working requirement of the generator. When the permanent magnet magnetizing device is arranged, the permanent magnets 2 are alternately arranged along the radial outer side of the inner rotor iron core 4, and the magnetizing directions of two adjacent permanent magnets 2 are opposite. And a generator air gap is formed between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2, and the stator 3 without the laminated iron core is arranged in the air gap and fixed on the machine shell. The magnetic flux generated by the permanent magnet 2 forms a closed loop with the generator air gap between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2.
The inner rotor core 4 in this embodiment is in the shape of a circular ring having an outer radius
Figure 100002_DEST_PATH_IMAGE060
Determined by the actual demand of the generator. The outer contour of the outer rotor iron core 1 is circular, and the circular radius thereof
Figure 100002_DEST_PATH_IMAGE062
The actual requirements of the generator determine that the inner contour of the rotor core 1 is formed by a group of eccentric arcs which are concentric and concave outwards, the number of the eccentric arcs is equal to that of the permanent magnets 2, and the positions of the eccentric arcs correspond to the permanent magnets 2 one by one.
When the rotor core is arranged, the circular outline of the outer rotor core 1, the inner outline of the tile-shaped permanent magnet 2 and the inner outline of the inner rotor core 4 are concentrically arranged, and the concentric point is used as the geometric center of the generator (also the geometric center of the rotor). Two end points of the eccentric arc on the outer rotor iron core 1 are positioned on the extension line of the connecting line of the two side edges of the corresponding permanent magnet 2 and the geometric center of the generator. Meanwhile, the center of the eccentric arc is positioned on the connecting line of the center of the eccentric arc and the geometric center of the generator.
Point O in fig. 2 is the geometric center of the generator; A. b, two points are two end points of the eccentric arc, O' point is the center of the eccentric arc, and H point is the middle point of the eccentric arc;
Figure 100002_DEST_PATH_IMAGE064
is the thickness of the permanent magnet;
Figure 100002_DEST_PATH_IMAGE066
the radius of the outline of the outer rotor iron core 1;
Figure 100002_DEST_PATH_IMAGE068
the radius of the outer contour of the inner rotor iron core 4;
Figure 100002_DEST_PATH_IMAGE070
is the radius of the eccentric arc;
Figure 100002_DEST_PATH_IMAGE072
the distance from two end points of the eccentric arc to the geometric center of the generator;
Figure 100002_DEST_PATH_IMAGE074
the eccentricity value is the distance between the center of the eccentric arc and the geometric center of the rotor.
The specific relevant parameters in this embodiment are as follows:
the number of the eccentric arcs arranged on the inner contour of the outer rotor iron core is
Figure DEST_PATH_IMAGE076
And satisfies the relation:
Figure DEST_PATH_IMAGE078
in which
Figure DEST_PATH_IMAGE080
The number of pole pairs of the generator is set;
eccentricity value between circle center of eccentric arc and geometric center of generator
Figure DEST_PATH_IMAGE082
And satisfies the relation:
Figure DEST_PATH_IMAGE084
wherein
Figure DEST_PATH_IMAGE086
Which is the radius of the outer contour of the outer rotor core 1,
Figure DEST_PATH_IMAGE088
which is the radius of the outer contour of the inner rotor core 4,
Figure DEST_PATH_IMAGE090
is the thickness of the permanent magnet;
the distance from two end points of the eccentric arc to the geometric center of the generator is
Figure DEST_PATH_IMAGE092
And satisfies the relation:
Figure DEST_PATH_IMAGE094
；
the radius of the eccentric arc is
Figure DEST_PATH_IMAGE096
And satisfies the relation:
Figure DEST_PATH_IMAGE098
。
in this embodiment 1, an outer rotor is used to change the outer diameter of the air gap from a circular arc
Figure DEST_PATH_IMAGE100
Is 86mm, and the outer diameter of the inner rotor
Figure DEST_PATH_IMAGE102
Is 50mm, the thickness of the permanent magnet
Figure DEST_PATH_IMAGE104
5mm, number of pole pairs
Figure DEST_PATH_IMAGE106
Taking an energy storage flywheel brushless direct-current generator designed based on an outer rotor core eccentric structure as an example, the outer rotor shared circular arc variable air gap core is designed:
is composed of
Figure 150977DEST_PATH_IMAGE108
Obtaining the value of the air gap of the circular arc
Figure 632774DEST_PATH_IMAGE110
Satisfy the requirements of
Figure 780859DEST_PATH_IMAGE112
Convenient processing and variable air gap value of the circular arc
Figure 664501DEST_PATH_IMAGE114
Preferably 10mm;
is composed of
Figure 872628DEST_PATH_IMAGE116
The distance from two end points of the single common-cycle arc variable air gap arc to the geometric center of the generator is obtained as
Figure 841721DEST_PATH_IMAGE118
Satisfy the requirements of
Figure 527918DEST_PATH_IMAGE120
Convenient for processing
Figure 30181DEST_PATH_IMAGE122
Preferably 60mm;
is obtained by the formula
Figure 409210DEST_PATH_IMAGE124
The radius of a single common-circumference arc variable-air-gap arc is obtained as
Figure 865599DEST_PATH_IMAGE126
Is 50.9mm.
The traditional energy storage flywheel generator is used as a comparative example, and the generator parameters are the outer diameter of the outer rotor is 86mm, the inner diameter of the outer rotor is 60mm, and the number of pole pairs
Figure 355486DEST_PATH_IMAGE128
The outer diameter of the inner rotor is 50mm, the outer diameter of the permanent magnet is 55mm, the thickness is 5mm, and the inner diameter is 50mm.
Compared with the traditional energy storage flywheel generator, the flywheel brushless direct current generator based on the structure of the embodiment 1 has the air gap magnetic field which is closer to a square wave. As shown in FIG. 3, the square wave evaluation method is flat top portion ratio
Figure 948141DEST_PATH_IMAGE130
Push-press type
Figure 498071DEST_PATH_IMAGE132
Is calculated, wherein
Figure 441757DEST_PATH_IMAGE134
Is the part above 98% of the maximum value of the air-gap magnetic field in one period of the air-gap waveform,
Figure 735335DEST_PATH_IMAGE136
the invention has the air gap waveform with half cycle width, compared with the structure of the traditional coreless cup generator
Figure 448076DEST_PATH_IMAGE138
The yield is increased from 50.66% to 68.99% and is increased by 36.2%.
Example 2
Embodiment 2 discloses a square wave rotor designed based on an outer rotor core eccentric structure, which is used in a hollow cup type square wave flywheel motor, and referring to fig. 4 and fig. 5, the whole rotor main body component comprises an outer rotor core 1, a permanent magnet 2, a magnetism isolating block 6, a hollow cup stator 3, an inner rotor core 4 and a rotor shaft 5. Both the outer rotor core 1 and the inner rotor core 4 are fixedly connected to the rotor shaft 5, so that the outer rotor core 1 and the inner rotor core 4 can be rotated together with the rotor shaft 5. When the permanent magnet generator is specifically arranged, the radial outer side of the outer rotor iron core 1 is arranged at the outer end of the rotor shaft 5, the radial inner side of the inner rotor iron core 4 is arranged at the inner end of the rotor shaft 5, the radial outer side of the inner rotor iron core 4 is provided with the permanent magnet 2, the permanent magnet 2 is in a tile shape, the thickness of the permanent magnet is determined according to the actual working requirement of the generator, and the number of the permanent magnet is determined according to the number of pole pairs of the motor. The permanent magnets 2 are alternately arranged along the radial outer side of the inner rotor iron core 4, and the magnetizing directions of two adjacent permanent magnets 2 are opposite. Meanwhile, the magnetic isolation blocks 6 are also tile-shaped and are arranged between two adjacent permanent magnets, and the number of the magnetic isolation blocks is the same as that of the permanent magnets. A motor air gap is formed between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2, the hollow cup stator 3 is arranged in the air gap and fixed on the machine shell, and magnetic flux generated by the permanent magnet 2 forms a closed loop through the air gap between the radial inner side of the outer rotor iron core 1 and the permanent magnet 2.
The inner rotor core 4 in this embodiment is circular in shape and has an outer radius
Figure 903328DEST_PATH_IMAGE140
Determined by the actual demand of the motor. The inner contour of the outer rotor iron core 1 is formed by a group of eccentric arcs which are sunken outwards, the number of the eccentric arcs is consistent with that of the permanent magnets 2, the positions of the eccentric arcs correspond to the permanent magnets 2 one by one, the outer contour of the outer rotor iron core 1 is circular, and the radius of the outer rotor iron core 1 is circular
Figure 835774DEST_PATH_IMAGE142
Determined by the actual demand of the motor.
When the motor is arranged, the circular outline of the outer rotor iron core 1, the inner outline of the tile-shaped permanent magnet 2 and the inner outline and the outer outline of the inner rotor iron core 4 are concentrically arranged, and the concentric point of the motor is used as the geometric center of the motor (also the geometric center of the rotor). Two end points of the eccentric arc are positioned on an extension line of a connecting line of the middle point of the magnetic isolation blocks 6 on two sides of the corresponding permanent magnet 2 and the geometric center of the motor, and a ray led out from the middle point of the eccentric arc in the direction of the circle center passes through the corresponding permanent magnet 2, the inner rotor iron core 4 and the rotor shaft 5 and passes through the geometric center of the motor.
Point O in fig. 5 is the geometric center of the motor; A. b, two points are two end points of the eccentric arc, O' point is the center of the eccentric arc, and H point is the middle point of the eccentric arc; C. d and E are the middle points of the tile-shaped edges of the magnetic separation blocks 6 between the adjacent permanent magnets 2;
Figure 667464DEST_PATH_IMAGE144
is the thickness of the permanent magnet;
Figure 234711DEST_PATH_IMAGE146
profiled for outer rotor core 1A radius;
Figure 126444DEST_PATH_IMAGE148
the radius of the profile of the inner rotor core 4;
Figure 44721DEST_PATH_IMAGE150
is the radius of the eccentric arc;
Figure 680102DEST_PATH_IMAGE152
the distance from two end points of the eccentric arc to the geometric center of the motor;
Figure 836277DEST_PATH_IMAGE154
the eccentric value is the distance between the center of the eccentric arc and the geometric center of the motor;
Figure 164490DEST_PATH_IMAGE156
is the inner diameter of the tile-shaped magnetic isolating block,
Figure 38905DEST_PATH_IMAGE158
the outer diameter of the tube is the diameter of the tube,
Figure 743556DEST_PATH_IMAGE160
is its opening angle;
Figure 19817DEST_PATH_IMAGE162
is the tile-shaped opening angle of the permanent magnet.
The specific relevant parameters in this embodiment are as follows:
the tile-shaped inner diameter of the magnetic isolation block is
Figure 17466DEST_PATH_IMAGE164
And satisfies the relation:
Figure 644757DEST_PATH_IMAGE166
the tile-shaped outer diameter is
Figure 621940DEST_PATH_IMAGE168
And satisfies the relation:
Figure DEST_PATH_IMAGE170
in which
Figure DEST_PATH_IMAGE172
Which is the radius of the outer contour of the inner rotor core 4,
Figure DEST_PATH_IMAGE174
is the thickness of the permanent magnet 2;
the magnetic isolation block has a tile-shaped opening angle of
Figure DEST_PATH_IMAGE176
And satisfies the relation:
Figure DEST_PATH_IMAGE178
tile-shaped opening angle of permanent magnet
Figure DEST_PATH_IMAGE180
Satisfy the relation
Figure DEST_PATH_IMAGE182
In which
Figure DEST_PATH_IMAGE184
The number of pole pairs of the motor is;
the number of the eccentric arcs on the outer rotor iron core is
Figure DEST_PATH_IMAGE186
And satisfies the relation:
Figure DEST_PATH_IMAGE188
；
the distance between the center of the eccentric arc and the geometric center of the motor is an eccentric value
Figure DEST_PATH_IMAGE190
And satisfies the relation:
Figure DEST_PATH_IMAGE192
wherein, in the process,
Figure DEST_PATH_IMAGE194
is an outer rotor iron core 1The radius of the outer contour is such that,
Figure DEST_PATH_IMAGE196
the coefficient of the magnetic isolation block satisfies the relation:
Figure DEST_PATH_IMAGE198
；
the distance from two end points of the eccentric arc to the geometric center of the motor is
Figure DEST_PATH_IMAGE200
And satisfies the relation:
Figure DEST_PATH_IMAGE202
；
the radius of the eccentric arc is
Figure DEST_PATH_IMAGE204
And satisfies the relation:
Figure DEST_PATH_IMAGE206
。
example 2 outer diameter of outer rotor core
Figure DEST_PATH_IMAGE208
Is 95mm, and the outer diameter of the inner rotor
Figure DEST_PATH_IMAGE210
Is 70mm, and the thickness of the permanent magnet
Figure DEST_PATH_IMAGE212
5mm, number of pole pairs
Figure DEST_PATH_IMAGE214
For example, the hollow cup-shaped square wave motor based on the eccentricity of the outer rotor core is 4, and the magnetic isolation block and the outer rotor core are designed:
is composed of
Figure DEST_PATH_IMAGE216
Obtain the tile-shaped inner diameter of the magnetic isolation block
Figure DEST_PATH_IMAGE218
Is of the formula
Figure DEST_PATH_IMAGE220
Obtain the tile-shaped outer diameter of the magnetic separation block
Figure DEST_PATH_IMAGE222
。
By the formula
Figure DEST_PATH_IMAGE224
Dewar tile type opening angle
Figure DEST_PATH_IMAGE226
Satisfy the requirements of
Figure DEST_PATH_IMAGE228
In order to facilitate the processing and the manufacturing,
Figure DEST_PATH_IMAGE230
preferably takes the value of
Figure DEST_PATH_IMAGE232
Is of the formula
Figure DEST_PATH_IMAGE234
Determining the tile-shaped opening angle of the permanent magnet 2
Figure DEST_PATH_IMAGE236
Is composed of
Figure DEST_PATH_IMAGE238
(42.5°)；
Is composed of
Figure DEST_PATH_IMAGE240
Calculating the eccentricity of the outer rotor core
Figure DEST_PATH_IMAGE242
Satisfy the requirement of
Figure DEST_PATH_IMAGE244
For convenience of processing and manufacturing, its deviationHeart value
Figure DEST_PATH_IMAGE246
Preferably 10mm;
is composed of
Figure DEST_PATH_IMAGE248
The distance from two end points of the eccentric arc to the geometric center of the motor is obtained as
Figure DEST_PATH_IMAGE250
Satisfy the requirement of
Figure DEST_PATH_IMAGE252
In order to facilitate the processing and the manufacturing,
Figure 484198DEST_PATH_IMAGE250
preferably 80mm;
is obtained by the formula
Figure DEST_PATH_IMAGE254
Determining the radius of a single eccentric circular arc of the circle
Figure DEST_PATH_IMAGE256
Is 70.86mm.
The motor parameters of the traditional hollow cup type motor are that the outer diameter of an eccentric outer rotor is 95mm, the inner diameter is 70mm, and the number of pole pairs is 95mm
Figure DEST_PATH_IMAGE258
The outer diameter of the inner rotor is 80mm, the outer diameter of the permanent magnet is 76mm, the thickness is 6mm, and the inner diameter is 70mm.
Compared with the conventional hollow cup type motor, the square wave motor disclosed in this embodiment 2 has an air gap field closer to a square wave. As shown in FIG. 6, the square wave evaluation method is flat top portion ratio
Figure DEST_PATH_IMAGE260
Push-press type
Figure DEST_PATH_IMAGE262
Is calculated, wherein
Figure DEST_PATH_IMAGE264
The portion of the air-gap waveform in one cycle above the maximum of the 98% air-gap field,
Figure DEST_PATH_IMAGE266
the air gap waveform is half cycle width, compared with the structure of the traditional hollow cup motor, the invention ensures that
Figure DEST_PATH_IMAGE268
The yield is increased from 62.03% to 71.27% and 14.9%.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. A square wave rotor designed based on an eccentric structure of an outer rotor iron core comprises the outer rotor iron core, permanent magnets, a stator, an inner rotor iron core and a rotor shaft, wherein the radial outer side of the outer rotor iron core is arranged at the outer end of the rotor shaft, 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 inner outline and the outer outline of the permanent magnet and the inner outline and the outer outline of the inner rotor iron core are concentrically arranged, the concentric point is the geometric center of the rotor, two end points of the eccentric arc are positioned on an extension line of connecting lines of two corresponding side edges of the permanent magnet and the geometric center of the rotor, and the center of the eccentric arc is positioned on a connecting line of the center of the eccentric arc and the geometric center of the rotor;
wherein, the distance from two end points of the eccentric circular arc to the geometric center is
Figure DEST_PATH_IMAGE002
And satisfies the relation:
Figure DEST_PATH_IMAGE004
wherein
Figure DEST_PATH_IMAGE006
Is the radius of the profile of the inner rotor core, b is the thickness of the permanent magnet, and
Figure DEST_PATH_IMAGE008
the units of (A) are all mm;
the distance between the center of the eccentric arc and the geometric center of the rotor is an eccentric value
Figure DEST_PATH_IMAGE010
And satisfies the relation:
Figure DEST_PATH_IMAGE012
wherein
Figure DEST_PATH_IMAGE014
Is the radius of the outer contour of the outer rotor iron core,
Figure DEST_PATH_IMAGE016
is the number of pole pairs, and =4;
the radius of the eccentric arc is
Figure DEST_PATH_IMAGE018
And satisfies the relation:
Figure DEST_PATH_IMAGE020
。
2. a square wave rotor based on an eccentric structure design of an outer rotor iron core comprises the outer rotor iron core, permanent magnets, a stator, an inner rotor iron core, a rotor shaft and tile-shaped magnetic isolation blocks, wherein the number of the magnetic isolation blocks is equal to that of the permanent magnets;
the magnetic isolation block is arranged between two adjacent permanent magnets, two end points of the eccentric arc are positioned on an extension line of a connecting line of the middle point of tile-shaped edges of the magnetic isolation blocks at two sides of the corresponding permanent magnet and the geometric center of the rotor, and the center of the eccentric arc is positioned on a connecting line of the middle point of the eccentric arc and the geometric center of the rotor;
wherein the distance from the two end points of the eccentric arc to the geometric center is
Figure DEST_PATH_IMAGE022
And is and
Figure DEST_PATH_IMAGE024
is mm, satisfies the relation:
Figure DEST_PATH_IMAGE026
wherein
Figure DEST_PATH_IMAGE028
Is the radius of the outer contour of the inner rotor iron core,
Figure DEST_PATH_IMAGE030
is the thickness of the permanent magnet, and
Figure DEST_PATH_IMAGE032
the units of (A) are all mm;
the distance between the center of the eccentric arc and the geometric center is an eccentric value
Figure DEST_PATH_IMAGE034
And satisfies the relation:
Figure DEST_PATH_IMAGE036
in which
Figure DEST_PATH_IMAGE038
Is the radius of the outer contour of the outer rotor iron core,
Figure DEST_PATH_IMAGE040
is a magnetic isolation block coefficient and satisfies the relation:
Figure DEST_PATH_IMAGE042
in which
Figure DEST_PATH_IMAGE044
Is the number of pole pairs, and =4;
the radius of the eccentric arc is
Figure DEST_PATH_IMAGE046
And satisfies the relation:
Figure DEST_PATH_IMAGE048
；
the tile-shaped field angle of the magnetic isolation block is
Figure DEST_PATH_IMAGE050
And satisfies the relation:
Figure DEST_PATH_IMAGE052
the tile-shaped opening angle of the permanent magnet is
Figure DEST_PATH_IMAGE054
Satisfy the relation
Figure DEST_PATH_IMAGE056
Wherein
Figure DEST_PATH_IMAGE058
Is the number of pole pairs.
3. The square wave rotor designed based on the eccentric structure of the outer rotor core as recited in claim 2, wherein the inside diameter of the tile shape of the magnet isolating block is
Figure DEST_PATH_IMAGE060
And satisfies the relation:
Figure DEST_PATH_IMAGE062
the tile-shaped outer diameter of the magnetic isolating block is
Figure DEST_PATH_IMAGE064
And satisfies the relation:
Figure DEST_PATH_IMAGE066
wherein
Figure DEST_PATH_IMAGE068
Is the radius of the outer contour of the inner rotor iron core,
Figure DEST_PATH_IMAGE070
is the thickness of the permanent magnet.
4. The square-wave rotor designed based on the eccentric structure of the outer rotor core according to claim 1 or 2, wherein the number of the eccentric arcs on the outer rotor core is set to be
Figure DEST_PATH_IMAGE072
And satisfies the relation:
Figure DEST_PATH_IMAGE074
。
CN202110625200.6A 2021-06-04 2021-06-04 Square wave rotor designed based on outer rotor core eccentric structure Active CN113541355B (en)

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