CN108736608B - Rotor structure of Halbach motor and manufacturing method thereof - Google Patents
Rotor structure of Halbach motor and manufacturing method thereof Download PDFInfo
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- CN108736608B CN108736608B CN201810726498.8A CN201810726498A CN108736608B CN 108736608 B CN108736608 B CN 108736608B CN 201810726498 A CN201810726498 A CN 201810726498A CN 108736608 B CN108736608 B CN 108736608B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 288
- 239000010959 steel Substances 0.000 claims abstract description 288
- 230000001154 acute effect Effects 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 9
- 239000003292 glue Substances 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- -1 aluminum nickel cobalt Chemical compound 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
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Classifications
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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
- H02K1/2706—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
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Linear Motors (AREA)
Abstract
The invention provides a rotor structure of a Halbach motor, which comprises N-pole magnetic steel, S-pole magnetic steel and a rotating shaft, wherein the N-pole magnetic steel comprises N-pole large magnetic steel and N-pole small magnetic steel, the S-pole magnetic steel comprises S-pole large magnetic steel and S-pole small magnetic steel, and the rotor structure is specifically defined: in the N-minimum magnetic steel, the magnetic force lines are parallel to the diagonal line of the radial tangent plane of the N-minimum magnetic steel or have an acute included angle, and in the S-minimum magnetic steel, the magnetic force lines are parallel to the diagonal line of the radial tangent plane of the S-minimum magnetic steel or have an acute included angle. The invention also provides a manufacturing method of the rotor structure of the Halbach motor. The invention has the following improved advantages: the permanent magnet forming the magnetic group has simple structure and shape and low processing difficulty; the installation and operation are simple and convenient, the motor production efficiency is high, and the product consistency is improved; the magnetic group is structurally limited, so that accumulated errors during assembly can be eliminated, and the motor performance is improved; the sectional area of the permanent magnet is larger, and the internal magnetic circuit of the permanent magnet is longer, so that the anti-demagnetizing capability of the motor is improved.
Description
Technical Field
The invention relates to the technical field of motor equipment, in particular to a rotor mechanism of a Halbach motor and a manufacturing method thereof.
Background
Halbach motors are motors that employ Halbach array magnet structures, which are engineered to approximate ideal magnet structures with the design goal of generating the strongest magnetic field with the least amount of magnets.
The halbach array magnet structure can enhance the field intensity of the magnet units in one direction by utilizing a special magnet unit arrangement mode.
The Halbach rotor structure is applied to a permanent magnet motor, a special motor magnetic field loop can be constructed, the rotor magnetic yoke structure can be removed, the air gap flux density is increased, the air gap waveform is optimized, various performances of the motor are effectively improved, the motor weight is reduced, and the product cost is reduced.
In the prior art, traditional Halbach rotor comprises N pole magnet steel, S pole magnet steel and pivot, and N pole magnet steel and S pole magnet steel adopt flat plate type structure, and N pole magnet steel or S pole magnet steel paste the pivot, are line contact between paster (N pole magnet steel, S pole magnet steel) and the pivot, because the paster degree of difficulty is great, adopt the manual work to carry out the paster operation generally, the manual paster operation can cause the error accumulation of paster. Because the Halbach rotor has a complex structure, the problems of poor manufacturability, inflexible design and the like exist, and the problems exist, so that the Halbach rotor cannot realize batch production, and even the performance of small batch production is poor.
In summary, due to unreasonable structural design and complicated processing technology, various advantages of the Halbach rotor structure cannot be applied to actual production.
Disclosure of Invention
The invention aims to provide a Halbach motor which is reasonable in structural design and low in manufacturing difficulty.
In order to achieve the above object, the present invention provides the following technical solutions:
a rotor structure of Halbach motor comprises N pole magnetic steel, S pole magnetic steel and a rotating shaft. In the invention, the rotating shaft is of a circular shaft structure; the N-pole magnetic steel comprises N-pole magnetic steel and N-pole magnetic steel, the radial tangential plane of the N-pole magnetic steel is isosceles trapezoid, the top surface of the N-pole magnetic steel is a first binding surface, the N-pole magnetic steel is stuck to the rotating shaft through the first binding surface, the radial tangential plane of the N-pole magnetic steel is rectangular, the magnetic lines of force of the N-pole magnetic steel in the N-pole magnetic steel are parallel to the diagonal line of the radial tangential plane of the N-pole magnetic steel or have acute angle, one side surface of the N-pole magnetic steel is a second binding surface, the N-pole magnetic steel is stuck to the rotating shaft through the second binding surface, one side surface of the N-pole magnetic steel is connected with the side surface of the N-pole magnetic steel, and two sides of the N-pole magnetic steel are respectively provided with one or more N-pole magnetic steels with the same quantity and N-pole magnetic groups; the S-pole magnetic steel comprises S-pole magnetic steel and S-pole extremely-small magnetic steel, the radial tangential plane of the S-pole extremely-large magnetic steel is isosceles trapezoid, the top surface of the S-pole extremely-large magnetic steel is a third joint surface, the S-pole extremely-large magnetic steel is adhered to the rotating shaft through the third joint surface, the radial tangential plane of the S-pole extremely-small magnetic steel is rectangular, magnetic lines of force of the S-pole extremely-small magnetic steel are parallel to or have acute angle with the diagonal line of the radial tangential plane of the S-pole extremely-small magnetic steel in the S-pole extremely-small magnetic steel, one side surface of the S-pole extremely-small magnetic steel is a fourth joint surface, the S-pole extremely-small magnetic steel is adhered to the rotating shaft through the fourth joint surface, one side surface of the S-pole extremely-small magnetic steel is connected with the side surface of the S-pole extremely-large magnetic steel, and two sides of the S-pole extremely-small magnetic steel are respectively provided with one or more S-pole extremely-pieces with S-pole magnetic groups; the N pole magnetic groups are provided with a plurality of S pole magnetic groups, and the N pole magnetic groups and the S pole magnetic groups are arranged alternately and surround the rotating shaft to form a rotor magnetic group with a cylindrical structure.
Preferably, the N-pole magnetic steel, the S-pole magnetic steel and the S-pole magnetic steel are provided with additional layers on the side surfaces facing away from the rotating shaft, the outer side surfaces of the additional layers are smooth curved surfaces, and the inner side surfaces of the additional layers are connected with the N-pole magnetic steel, the S-pole magnetic steel and the S-pole magnetic steel; the outer side surface of the rotor magnetic group is provided with the additional layer and forms a circular curved surface structure.
Preferably, the additional layer is disposed on the N-pole magnetic steel, the S-pole magnetic steel, and forms an integral structure.
The invention also provides a manufacturing method of the rotor structure of the Halbach motor, which comprises the following steps:
firstly, preparing N-pole magnetic steel and S-pole magnetic steel with isosceles trapezoid radial tangential planes through cutting;
step two, preparing N-minimum magnetic steel and S-minimum magnetic steel with rectangular radial sections through cutting;
magnetizing the N-pole magnetic steel, wherein magnetic lines perpendicular to the top surface or the bottom surface of the N-pole magnetic steel are formed in the N-pole magnetic steel, magnetizing the S-pole magnetic steel, magnetic lines perpendicular to the top surface or the bottom surface of the S-pole magnetic steel are formed in the S-pole magnetic steel, magnetizing the N-pole magnetic steel, magnetic lines parallel to the diagonal of the radial tangential plane or having an acute angle with the diagonal of the radial tangential plane are formed in the N-pole magnetic steel, and magnetic lines parallel to the diagonal of the radial tangential plane or having an acute angle with the diagonal of the radial tangential plane are formed in the S-pole magnetic steel;
step four, the N-pole magnetic steel is arranged on two side edges of the N-pole magnetic steel in a separating mode, the N-pole magnetic steel and the side edges of the N-pole magnetic steel are in seamless bonding mode, an N-pole magnetic group is formed, magnetic lines of force in the N-pole magnetic steel and magnetic lines of force in the N-pole magnetic steel form an acute angle structure, the S-pole magnetic steel is arranged on two side edges of the S-pole magnetic steel in a separating mode, the S-pole magnetic steel and the side edges of the S-pole magnetic steel are in seamless bonding mode, an S-pole magnetic group is formed, and magnetic lines of force in the S-pole magnetic steel form an acute angle structure;
and fifthly, setting a rotating shaft, and setting the N-pole magnetic group and the S-pole magnetic group on the outer side surface of the rotating shaft, wherein the N-pole magnetic group and the S-pole magnetic group are arranged in a penetrating way.
Preferably, the invention further provides a rotor magnetic group assembly tool, and the magnetic group assembly tool is provided with a limiting groove with an isosceles trapezoid cross section.
Preferably, the rotor magnetic group assembly fixture comprises a base, wherein the base is provided with the limit groove, and the upper side of the base is provided with an upper cover through a clamping bolt;
the width of the base and the width of the upper cover are the same as those of the N-pole magnetic steel or the S-pole magnetic steel.
Through the structural design, the invention has the following improved advantages: the permanent magnets forming the N pole magnetic group and the S pole magnetic group are simple in structural shape and low in processing difficulty; when the permanent magnets forming the N-pole magnetic group and the S-pole magnetic group are assembled, the installation and the operation are simple and convenient, and the installation precision of the permanent magnets is improved through the pre-installed N-pole magnetic group and S-pole magnetic group, the production efficiency of the Halbach motor is improved, the consistency of products is improved, and therefore the mass production of the Halbach motor is realized; the N pole magnetic group and the S pole magnetic group have small structural errors, so that the circumferential accumulated errors generated during assembly on the rotating shaft are also small. In the N-pole magnetic group or the S-pole magnetic group, the bottom surface (the surface for connecting with the rotating shaft) is formed by three angled planes, and the angle positions of the three planes are consistent with the outer surface of the rotating shaft. Therefore, the three planes are used for carrying out structural limitation on the assembly of the N pole magnetic group or the S pole magnetic group, so that accumulated errors can be eliminated, the air gap magnetic density waveform sine of the Halbach structure motor is greatly optimized, and the motor performance is improved. In the invention, compared with a common magnetic circuit structure, the N, S magnetic group consisting of the Halbach structure has the advantages that the flowing distance of the magnetic circuit from the inside of the permanent magnet is longer, the sectional area of the permanent magnet is larger, and the magnetic circuit inside the permanent magnet is longer, so that the anti-demagnetizing capability of the motor is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Wherein:
FIG. 1 is a schematic cross-sectional view of a Halbach rotor perpendicular to a shaft in accordance with one embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1;
FIG. 3 is a schematic diagram of the distribution of magnetic lines inside each magnetic steel based on the structure of FIG. 1;
FIG. 4 is a schematic diagram of an N pole magnetic assembly according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an S pole magnetic assembly according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a rotor magnet assembly tooling according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;
reference numerals illustrate:
a rotating shaft 1, N-pole big magnetic steel 2, N-pole tiny magnetic steel 3, S-pole big magnetic steel 4, S-pole tiny magnetic steel 5,
Base 6, clamping bolt 7, upper cover 8.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the invention and not limitation of the invention. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
Referring to fig. 1 to 7, fig. 1 is a schematic cross-sectional structure of a Halbach rotor perpendicular to a rotation axis according to an embodiment of the present invention; FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1; FIG. 3 is a schematic diagram of the distribution of magnetic lines inside each magnetic steel based on the structure of FIG. 1; FIG. 4 is a schematic diagram of an N pole magnetic assembly according to an embodiment of the present invention; FIG. 5 is a schematic diagram of an S pole magnetic assembly according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of a rotor magnet assembly tooling according to an embodiment of the present invention; fig. 7 is a cross-sectional view taken along B-B in fig. 6.
The invention aims to solve the technical problem of providing a novel Halbach rotor structure and a processing method thereof, and the problem that the existing Halbach rotor cannot be produced in batches can be solved through the structural design. Meanwhile, the invention can solve the problems of poor performance, poor consistency and the like of the Halbach rotor structure caused by the technical problem to a great extent.
The Halbach rotor provided by the invention mainly comprises a permanent magnet and a rotating shaft, and in the manufacturing method of the Halbach rotor provided by the invention, a permanent magnet forming tool and a rotor forming tool are also used.
Specifically, in the rotor structure of the Halbach motor provided by the invention, the rotor structure comprises N-pole magnetic steel, S-pole magnetic steel and a rotating shaft 1, wherein the rotating shaft 1 is of a circular shaft structure.
The invention mainly optimizes the structure of N-pole magnetic steel and S-pole magnetic steel, and the specific design is as follows: the N-pole magnetic steel comprises N-pole magnetic steel 2 and N-pole extremely-small magnetic steel 3, the radial tangential plane of the N-pole extremely-large magnetic steel 2 is isosceles trapezoid, the top surface of the N-pole extremely-large magnetic steel 2 is a first binding surface, the N-pole extremely-large magnetic steel 2 is attached to the rotating shaft 1 through the first binding surface, the central axis of the N-pole extremely-large magnetic steel 2 is perpendicular to the axis of the rotating shaft 1, the radial tangential plane of the N-pole extremely-small magnetic steel 3 is rectangular, the magnetic force lines of the N-pole extremely-small magnetic steel 3 are parallel to the diagonal line of the radial tangential plane of the N-pole extremely-small magnetic steel 3, the central axis of the N-pole extremely-small magnetic steel 3 is perpendicular to the axis of the rotating shaft 1, one side surface of the N-pole extremely-small magnetic steel 3 is a second binding surface, one side surface of the N-pole extremely-small magnetic steel 3 is attached to the rotating shaft 1 through the second binding surface, and two side surfaces of the N-pole extremely-small magnetic steel 2 are respectively provided with one N-pole extremely-small magnetic steel 3 and are formed with N-pole magnetic groups.
The S-pole magnetic steel comprises S-pole magnetic steel 4 and S-pole magnetic steel 5,S, wherein the radial tangential plane of the S-pole magnetic steel 4 is isosceles trapezoid, the top surface of the S-pole magnetic steel 4 is a third joint surface, the S-pole magnetic steel 4 is attached to the rotating shaft 1 through the third joint surface, the central axis of the S-pole magnetic steel 4 is perpendicular to the axis of the rotating shaft 1, the radial tangential plane of the S-pole magnetic steel 5 is rectangular, the magnetic force lines of the S-pole magnetic steel 5 are in the S-pole magnetic steel 5 and are parallel to the diagonal line of the radial tangential plane of the S-pole magnetic steel 5, the central axis of the S-pole magnetic steel 5 is perpendicular to the axis of the rotating shaft 1, one side surface of the S-pole magnetic steel 5 is a fourth joint surface, the S-pole magnetic steel 5 is attached to the rotating shaft 1 through the fourth joint surface, and one side surface of the S-pole magnetic steel 5 is connected with the side surface of the S-pole magnetic steel 4, and two side surfaces of the S-pole magnetic steel 4 are respectively provided with an S-pole magnetic group.
The N pole magnetic groups are provided with a plurality of S pole magnetic groups, and the N pole magnetic groups and the S pole magnetic groups are arranged alternately and surround the rotating shaft 1 to form a rotor magnetic group with a cylindrical structure. In the present invention, the dimensions of the magnetic steel group are defined as follows: according to the motor performance requirement, the size of main magnetic circuit magnetic steel (N, S-pole magnetic steel) and the logarithm and the size of auxiliary magnetic circuit magnetic steel (N, S-pole magnetic steel) in the Halbach magnetic steel group are determined.
In the present invention, the shape of the magnetic steel group is defined as follows: and designing the shape of the magnetic steel group and the shape of each part of the magnetic steel according to the performance requirement and the size of the motor.
In the present invention, the assembly of the magnetic steel group is defined as follows: and (3) installing the magnetic steel in the magnetic steel groups with the same magnetic poles by using a rotor magnetic group assembly tool.
In the present invention, the definition of the Halbach motor assembly is as follows: the magnetic steel group is surface-mounted (the structure is mostly used for surface-mounted type rotors) on the rotating shaft to form the rotor, and then the motor assembly is carried out.
The rotor installation space formed by the coil windings is basically a cylindrical space structure in the motor, so that based on the structural design, the invention further provides additional layers on the side surfaces of the N-pole big magnetic steel 2, the N-pole tiny magnetic steel 3, the S-pole big magnetic steel 4 and the S-pole tiny magnetic steel 5, which are opposite to the rotating shaft 1, the outer side surfaces of the additional layers are smooth curved surfaces, and the inner side surfaces of the additional layers are connected with the N-pole big magnetic steel 2, the N-pole tiny magnetic steel 3, the S-pole big magnetic steel 4 and the S-pole tiny magnetic steel 5; the outer side surface of the rotor magnetic group is provided with an additional layer and forms a circular curved surface structure.
Through the limited structural design of designer, the additional layer sets up respectively on N utmost point magnet steel 2, N extremely little magnet steel 3, S extremely big magnet steel 4, the extremely little magnet steel 5 of S, with N utmost point magnet steel 2, N extremely little magnet steel 3, S extremely big magnet steel 4, the extremely little magnet steel 5 of S assemble in proper order accomplish the back, the lateral surface of the rotor magnet group that forms is the circular surface structure, and the air gap interval that has between rotor magnet group and the rotor installation space that the motor inner coil winding formed is unanimous like this.
In the present invention, the additional layers have various structural forms, which are not illustrated herein.
Defined herein as: the additional layer is arranged on the N-pole big magnetic steel 2, the N-pole tiny magnetic steel 3, the S-pole big magnetic steel 4 and the S-pole tiny magnetic steel 5 and forms an integral structure.
In the invention, the bonding modes and the fixture positioning of the N pole magnetic groups and the S pole magnetic groups are the same, so that the outline dimensions of all the magnetic pole groups are consistent, the installation is convenient, the uniformity of the rotor permanent magnet is improved, the air gap magnetic field harmonic wave of the motor is reduced, and the torque pulsation of the whole machine is reduced.
The installation process of the invention is as follows: bonding two inverted N-minimum magnetic steel 3 and one N-maximum magnetic steel 2 by glue; two inverted S-shaped extremely-small magnetic steels 5 are adhered to one S-shaped extremely-large magnetic steel 4 by glue, and then sequentially attached to the outer surface of the rotating shaft 1.
It should be noted that: in the invention, each part is assembled according to the process, and the installation position is noted during the assembly, so that the assembly error is reduced.
It should be noted that: in the invention, the large and small magnetic steels refer to the circumferential sizes of the permanent magnets, and the circumferential sizes of the large magnetic steels are larger than those of the small magnetic steels, and the proportion of the large magnetic steels to the small magnetic steels in one magnetic group is generally 60-90 percent (determined according to specific design); the small magnetic steel refers to a permanent magnet changing a magnetic circuit, the permanent magnets are arranged in pairs on two sides of the large magnetic steel, the logarithm of the small magnetic steel can be properly increased according to design requirements, and the total proportion in one magnetic group is generally not more than 40%.
The present invention also provides a manufacturing method for manufacturing the rotor structure of the Halbach motor, in which the manufacturing method comprises:
firstly, preparing N-pole large magnetic steel 2 and S-pole large magnetic steel 4 with radial tangential planes similar to isosceles trapezoids (the bottom side is an arc) through cutting;
step two, preparing N-minimum magnetic steel 3 and S-minimum magnetic steel 5 with rectangular radial sections through cutting;
magnetizing the N-pole magnetic steel 2, forming magnetic lines perpendicular to the top surface or the bottom surface of the N-pole magnetic steel 2, magnetizing the S-pole magnetic steel 4, forming magnetic lines perpendicular to the top surface or the bottom surface of the S-pole magnetic steel 4, magnetizing the N-pole magnetic steel 3, forming magnetic lines parallel to the diagonal of the radial tangential plane or having an acute angle with the diagonal of the radial tangential plane in the N-pole magnetic steel 3, magnetizing the S-pole magnetic steel 5, and forming magnetic lines parallel to the diagonal of the radial tangential plane or having an acute angle with the diagonal of the radial tangential plane in the S-pole magnetic steel 5;
step four, the N-pole tiny magnetic steel 3 is arranged on two side edges of the N-pole tiny magnetic steel 2 in a separated mode and is in seamless joint with the side edges of the N-pole tiny magnetic steel 2 to form an N-pole magnetic group, magnetic force lines in the N-pole tiny magnetic steel 3 and magnetic force lines in the N-pole tiny magnetic steel 2 form an acute angle structure, the S-pole tiny magnetic steel 5 is arranged on two side edges of the S-pole tiny magnetic steel 4 in a separated mode and is in seamless joint with the side edges of the S-pole tiny magnetic steel 4 to form an S-pole magnetic group, and magnetic force lines in the S-pole tiny magnetic steel 5 and magnetic force lines in the S-pole tiny magnetic steel 4 form an acute angle structure;
and fifthly, setting a rotating shaft 1, and setting an N-pole magnetic group and an S-pole magnetic group on the outer side surface of the rotating shaft 1, wherein the N-pole magnetic group and the S-pole magnetic group are arranged alternately.
In the third and fourth steps, the magnetizing direction of the small magnetic steel can be changed according to the overall structure of the motor, and in one embodiment of the invention, a pair of small magnetic steels are arranged in one magnetic group, and the magnetizing direction inside the small magnetic steel is parallel to the diagonal line of the cross section of the small magnetic steel; in another embodiment of the present invention, when two or more pairs of small magnetic steels are provided in one magnetic group, it is necessary to magnetize the magnetic group according to a specific size of the motor.
In the fourth step, the invention also uses a magnetic group assembly fixture, wherein the magnetic group assembly fixture is provided with a limit groove with an isosceles trapezoid cross section.
In the fifth step, the invention also uses a rotor magnetic group assembly tool, wherein the rotor magnetic group assembly tool is provided with a limiting hole, and the cross section of the limiting hole is regular polygon or circular.
The permanent magnet is cut into a designed shape and magnetized according to a fixed direction; using a permanent magnet forming tool to bond and form the permanent magnets forming the N pole magnetic group and the S pole magnetic group; and splicing the N pole magnetic groups and the S pole magnetic groups according to rules, installing the N pole magnetic groups and the S pole magnetic groups on the rotating shaft 1, fixing the N pole magnetic groups and the S pole magnetic groups by utilizing a rotor magnetic group assembly tool, and then bonding and solidifying the N pole magnetic groups and the S pole magnetic groups.
Referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of a rotor magnetic assembly tooling according to an embodiment of the invention; fig. 7 is a cross-sectional view taken along B-B in fig. 6.
The invention provides a rotor magnetic group assembling tool which comprises a base 6, wherein a limiting groove is formed in the base 6, and an upper cover 8 is arranged on the upper side of the base 6 through a tightening bolt 7; the width of the base 6 and the width of the upper cover 8 are the same as the width of the N-pole magnetic steel or the S-pole magnetic steel.
In the invention, the rotor magnet assembly tooling mainly has the function of installing the Halbach magnet steel groups (comprising the N-pole group and the S-pole group) in the step four, and the size of each Halbach magnet steel group is limited through the tooling, so that the consistency of the rotor magnet steel installation structure is improved. Because the structural accuracy of the rotor magnetic group is improved, the air gap waveform of the motor can be smoother. The tool consists of two parts (a base and an upper cover), namely a magnetic steel assembly forming tool. The rotor magnetic group assembly tool has the functions that: and fixing the Halbach magnetic steel group, limiting the relative position between the magnetic steels and limiting the assembly of the magnetic steels.
The rotor magnetic group assembly fixture is made of prolate metal, and a through hole is formed in the middle of the rotor magnetic group assembly fixture (formed by arranging an upper cover on a base and closing a limit groove through the upper cover). When the magnetic steel assembly is used, the magnetic steel with the same magnetic pole is arranged in the through hole of the tool according to the sequence of the step four, glue (anaerobic glue) is coated on the contact surface of the magnetic steel and the magnetic steel before the magnetic steel assembly is arranged, and the magnetic steel surface is ensured to be flush; after the glue is solidified, the Halbach magnetic steel set with the inside bonded into a whole is pressed out by a magnetic steel set pressing tool, and the residual glue in the tool is removed to complete the installation of one Halbach magnetic steel set.
After the structural innovation is carried out, the invention has the following advantages:
1. the permanent magnet forming the N pole magnetic group and the S pole magnetic group has simple structure and shape and low processing difficulty, is suitable for most surface-mounted permanent magnets, such as ferrite, aluminum nickel cobalt, rare earth materials and the like, and has wide application range;
2. when the permanent magnets forming the N pole magnetic group and the S pole magnetic group are assembled, the installation and the operation are simple and convenient, and because the complex installation of the permanent magnets in the prior art is an important limiting factor for unsuitable mass production of the Halbach structure, the structural design of the invention can realize mass production of the Halbach motor, and the production efficiency of the Halbach motor is high and the product consistency is good;
3. the N-pole magnetic group and the S-pole magnetic group have small structural errors, and thus, the circumferential cumulative error generated when the rotating shaft 1 is assembled is also small. In the N pole magnetic group or the S pole magnetic group, the bottom surface (the surface for connecting with the rotating shaft 1) is formed by three angular planes, so that the assembly of the N pole magnetic group or the S pole magnetic group is structurally limited by the three planes, and the center line of each N pole magnetic group or the S pole magnetic group is overlapped with the center line of the connecting surface of the rotating shaft 1 by only controlling the size precision of the excircle of the rotor, thus the independent positioning structure hardly generates accumulated errors in actual production and manufacture. Therefore, the invention can eliminate accumulated errors, greatly optimize the air gap magnetic density waveform of the Halbach structure motor and improve the motor performance;
4. compared with a motor with a common structure, the Halbach motor provided by the invention has the advantages that the sectional area of the permanent magnet is larger, and the internal magnetic circuit of the permanent magnet is longer, so that the external characteristic of the motor is improved, and meanwhile, the anti-demagnetizing capability is strong.
5. The influence of the installation precision of the permanent magnet is weakened through the pre-installed Halbach magnetic steel group; meanwhile, the influence of the processing and magnetizing precision of the permanent magnets is reduced by utilizing the shape and the distribution of the special permanent magnets, and the processing of batch products can be realized on the premise of ensuring the structural performance advantage of the Halbach rotor.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The rotor structure of the Halbach motor comprises N-pole magnetic steel, S-pole magnetic steel and a rotating shaft (1), and is characterized in that,
the rotating shaft is of a circular shaft structure;
the N-pole magnetic steel comprises N-pole magnetic steel (2) and N-pole magnetic steel (3), the radial tangential plane of the N-pole magnetic steel is isosceles trapezoid, the top surface of the N-pole magnetic steel is a first joint surface, the N-pole magnetic steel is stuck to the rotating shaft through the first joint surface, the radial tangential plane of the N-pole magnetic steel is rectangular, the magnetic lines of force in the N-pole magnetic steel are parallel to the diagonal line of the radial tangential plane of the N-pole magnetic steel or have acute angle included angles, one side surface of the N-pole magnetic steel is a second joint surface, the N-pole magnetic steel is stuck to the rotating shaft through the second joint surface, one side surface of the N-pole magnetic steel is connected with the side surface of the N-pole magnetic steel, and two sides of the N-pole magnetic steel are respectively provided with one or more N-pole magnetic steels with the same quantity and form an N-pole magnetic group;
the S-pole magnetic steel comprises S-pole magnetic steel (4) and S-pole extremely-small magnetic steel (5), the radial tangential plane of the S-pole extremely-large magnetic steel is isosceles trapezoid, the top surface of the S-pole extremely-large magnetic steel is a third joint surface, the S-pole extremely-large magnetic steel is adhered to the rotating shaft through the third joint surface, the radial tangential plane of the S-pole extremely-small magnetic steel is rectangular, the magnetic lines of force in the S-pole extremely-small magnetic steel are parallel to the diagonal line of the radial tangential plane of the S-pole extremely-small magnetic steel or have acute angle included angles, one side surface of the S-pole extremely-small magnetic steel is a fourth joint surface, the S-pole extremely-small magnetic steel is adhered to the rotating shaft through the fourth joint surface, one side surface of the S-pole extremely-small magnetic steel is connected with the side surface of the S-pole extremely-large magnetic steel, and two sides of the S-pole extremely-small magnetic steel are respectively provided with one or more S-pole extremely-small magnetic steel groups with the same quantity;
the N pole magnetic groups are provided with a plurality of S pole magnetic groups, and the N pole magnetic groups and the S pole magnetic groups are arranged alternately and surround the rotating shaft to form a rotor magnetic group with a cylindrical structure.
2. A rotor structure of a Halbach motor according to claim 1,
additional layers are arranged on the side surfaces of the N-maximum magnetic steel, the N-minimum magnetic steel, the S-maximum magnetic steel and the S-minimum magnetic steel, which are opposite to the rotating shaft, respectively, the outer side surfaces of the additional layers are smooth curved surfaces, and the inner side surfaces of the additional layers are connected with the N-maximum magnetic steel, the N-minimum magnetic steel, the S-maximum magnetic steel and the S-minimum magnetic steel;
the outer side surface of the rotor magnetic group is provided with the additional layer and forms a circular curved surface structure.
3. A rotor structure of a Halbach motor according to claim 2,
the additional layer is arranged on the N-pole magnetic steel, the S-pole magnetic steel and forms an integrated structure.
4. A method of manufacturing a rotor structure for a Halbach motor, comprising:
firstly, preparing N-pole magnetic steel and S-pole magnetic steel with isosceles trapezoid radial tangential planes through cutting;
step two, preparing N-minimum magnetic steel and S-minimum magnetic steel with rectangular radial sections through cutting;
magnetizing the N-pole magnetic steel, wherein magnetic lines perpendicular to the top surface or the bottom surface of the N-pole magnetic steel are formed in the N-pole magnetic steel, magnetizing the S-pole magnetic steel, magnetic lines perpendicular to the top surface or the bottom surface of the S-pole magnetic steel are formed in the S-pole magnetic steel, magnetizing the N-pole magnetic steel, magnetic lines parallel to the diagonal of the radial tangential plane or having an acute angle with the diagonal of the radial tangential plane are formed in the N-pole magnetic steel, and magnetic lines parallel to the diagonal of the radial tangential plane or having an acute angle with the diagonal of the radial tangential plane are formed in the S-pole magnetic steel;
step four, the N-pole magnetic steel is arranged on two side edges of the N-pole magnetic steel in a separating mode, the N-pole magnetic steel and the side edges of the N-pole magnetic steel are in seamless bonding mode, an N-pole magnetic group is formed, magnetic lines of force in the N-pole magnetic steel and magnetic lines of force in the N-pole magnetic steel form an acute angle structure, the S-pole magnetic steel is arranged on two side edges of the S-pole magnetic steel in a separating mode, the S-pole magnetic steel and the side edges of the S-pole magnetic steel are in seamless bonding mode, an S-pole magnetic group is formed, and magnetic lines of force in the S-pole magnetic steel form an acute angle structure;
and fifthly, setting a rotating shaft, and setting the N-pole magnetic group and the S-pole magnetic group on the outer side surface of the rotating shaft, wherein the N-pole magnetic group and the S-pole magnetic group are arranged in a penetrating way.
5. A method of manufacturing a rotor structure for a Halbach motor as claimed in claim 4,
the rotor magnetic group assembling tool is provided with a limiting groove with an isosceles trapezoid cross section.
6. A method of manufacturing a rotor structure for a Halbach motor as claimed in claim 5, wherein,
the rotor magnetic group assembling tool comprises a base (6), wherein the base is provided with the limit groove, and the upper side of the base is provided with an upper cover (8) through a clamping bolt (7);
the width of the base and the width of the upper cover are the same as those of the N-pole magnetic steel or the S-pole magnetic steel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112234779B (en) * | 2020-10-13 | 2022-02-08 | 山东省科学院自动化研究所 | Motor production method and system based on variable-thickness Halbach permanent magnet array |
| CN112803637A (en) * | 2021-01-14 | 2021-05-14 | 南京理工大学 | Permanent magnet synchronous motor and magnetism gathering rotor structure thereof |
| CN113659787B (en) * | 2021-07-15 | 2022-08-19 | 西安理工大学 | Five-phase axial flux permanent magnet motor for electric automobile |
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