CN113300571B - Mixed permanent magnet material type magnetic screw - Google Patents
Mixed permanent magnet material type magnetic screw Download PDFInfo
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- CN113300571B CN113300571B CN202110662446.0A CN202110662446A CN113300571B CN 113300571 B CN113300571 B CN 113300571B CN 202110662446 A CN202110662446 A CN 202110662446A CN 113300571 B CN113300571 B CN 113300571B
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- rotor
- permanent magnet
- magnetic
- radial
- axial
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/102—Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Abstract
The invention discloses a mixed permanent magnet material type magnetic lead screw, which comprises a rotor and a rotor, wherein the rotor comprises a rotor yoke and a rotor permanent magnet; the section of the rotor rotating shaft is of a regular polygon structure, and the rotor permanent magnet is wrapped on the surface of the rotor rotating shaft. The output and the force density of the magnetic lead screw are improved by using the Ha bach magnetizing array and the mixed permanent magnetic material; the difficulty of installation and processing is reduced by the regular polyhedron of the rotor rotating shaft, the shape of the regular polygon in the excircle of the rotor yoke and the approximately trapezoidal structure of the arc surface of the permanent magnet; the error caused by splicing the permanent magnets is reduced by the approximately trapezoidal structure of the arc surface of the permanent magnet; the cost and weight of the magnetic lead screw are reduced by the use of the hybrid permanent magnetic material.
Description
Technical Field
The invention relates to a magnetic lead screw, in particular to a mixed permanent magnet material type magnetic lead screw.
Background
The magnetic lead screw is used as a deformation of the mechanical lead screw, has the characteristics of high force density, no contact, simple maintenance and the like, and can convert rotary motion and linear motion into each other in a magnetic coupling and non-contact manner. Therefore, the method has good application prospect in the fields of artificial hearts, wave power generation and the like. At present, the radial magnetizing method is mainly studied, the permanent magnet is in a tile-type structure, expensive rare earth permanent magnet materials are mostly adopted, and the like, but the various current research situations have the problems of difficult processing, large installation error, high cost and the like.
The document IEEE Transactions on Magnetics, 51 (11): 1-4, 2015(New pilot-shaped Magnetic Pole Design for Magnetic Lead screening Structure) introduces a New Magnetic Lead Screw Structure for wave energy conversion, and proposes a New method to Shape an ideal spiral line in a simple manner with parallel magnetized magnets. Although the structure reduces the manufacturing complexity and keeps good force density, the sectional arc permanent magnet is adopted, the installation difficulty is increased, and the displacement difference is easy to occur between the block permanent magnets, namely the splicing precision is low.
The document IEEE Transactions on Industrial Electronics, 65 (9): 7536-7547, 2018(Design Optimization and Test of a radial Magnetized Magnetic Screw With Magnetized PMs) introduces a new radial Magnetized Magnetic Screw structure, and a new method is proposed to shape an ideal spiral line in a simple manner and to magnetize magnets Radially. While this configuration reduces manufacturing complexity while maintaining good force density, it entails an increase in cost due to the use of higher performance permanent magnet materials.
Disclosure of Invention
The invention aims to provide a mixed permanent magnet material type magnetic lead screw, which improves the output and the power density of the magnetic lead screw by using a Halbach magnetizing array and a mixed permanent magnet material; the difficulty of installation and processing is reduced by the regular polyhedron of the rotor rotating shaft, the shape of the regular polygon in the excircle of the rotor yoke and the approximately trapezoidal structure of the arc surface of the permanent magnet; the error caused by splicing the permanent magnets is reduced by the approximately trapezoidal structure of the arc surface of the permanent magnet; the cost and weight of the magnetic lead screw are reduced by the use of hybrid permanent magnet materials.
The purpose of the invention can be realized by the following technical scheme:
a magnetic force lead screw made of mixed permanent magnet materials comprises a rotor and a rotor, wherein the rotor comprises a rotor yoke iron and a rotor permanent magnet, the rotor comprises a rotor rotating shaft and a rotor permanent magnet, the section of the rotor yoke iron is of a regular polygon structure in the outer circle, the rotor yoke iron is sleeved outside the rotor, and the rotor permanent magnet is attached to the inner surface of the rotor yoke iron; the section of the rotor rotating shaft is of a regular polygon structure, and the rotor permanent magnet is wrapped on the surface of the rotor rotating shaft.
Furthermore, the rotor yoke and the rotor rotating shaft are both made of magnetic materials with rigidity.
Furthermore, the rotor rotating shaft and the rotor yoke are coaxial, a gap is formed between the rotor rotating shaft and the rotor yoke, and the gap is located between the rotor permanent magnet and the rotor permanent magnet.
Furthermore, the cross section of the rotor permanent magnet is of a regular polygon structure with an inner circle and an outer circle, the rotor permanent magnet sequentially comprises a first rotor axial permanent magnet, a first rotor radial permanent magnet, a second rotor axial permanent magnet and a second rotor radial permanent magnet, the first rotor axial permanent magnet, the first rotor radial permanent magnet, the second rotor axial permanent magnet and the second rotor radial permanent magnet are spirally distributed, the magnetizing directions of the first rotor axial permanent magnet and the second rotor axial permanent magnet are opposite, and the magnetizing directions of the first rotor radial permanent magnet and the second rotor radial permanent magnet are opposite.
Furthermore, the rotor permanent magnet and the rotor permanent magnet have the same structure and comprise a first rotor axial permanent magnet, a first rotor radial permanent magnet, a second rotor axial permanent magnet and a second rotor radial permanent magnet, and the difference is that the section of the rotor permanent magnet is in a regular polygon structure in the excircle.
Furthermore, the rotor permanent magnet and the rotor permanent magnet both adopt Halbach magnetizing modes.
Furthermore, the first rotor radial permanent magnet, the second rotor radial permanent magnet, the first rotor radial permanent magnet and the second rotor radial permanent magnet are made of rare earth permanent magnet materials with strong residual magnetism, and the first rotor axial permanent magnet, the second rotor axial permanent magnet, the first rotor axial permanent magnet and the second rotor axial permanent magnet are made of ferrite permanent magnet materials.
Furthermore, the magnetic fields in the rotor and the rotor are both spiral magnetic fields, linear motion and rotary motion are converted by magnetic field coupling, magnetic flux generated by the rotor permanent magnet enters the rotor permanent magnet through the air gap, penetrates out of the adjacent permanent magnet and returns to the adjacent rotor permanent magnet through the air gap.
Furthermore, the output and the torque of the rotor and the rotor are both zero when the relative displacement of the rotor and the rotor is zero, and the output is the maximum when the relative displacement of the rotor and the rotor is half of the polar distance.
The invention has the beneficial effects that:
according to the invention, the output force and the force density of the magnetic screw are improved by using the Halbach magnetizing array and the mixed permanent magnet material; the difficulty of installation and processing is reduced by the regular polyhedron of the rotor rotating shaft, the shape of the regular polygon in the excircle of the rotor yoke and the approximately trapezoidal structure of the arc surface of the permanent magnet; the error caused by splicing the permanent magnets is reduced by the approximately trapezoidal structure of the arc surface of the permanent magnet; the cost and weight of the magnetic lead screw are reduced by the use of hybrid permanent magnet materials.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the magnetic screw of the present invention;
FIG. 2 is a cross-sectional view of the magnetic lead screw of the present invention;
FIG. 3 is a schematic view of the magnetic screw of the present invention;
FIG. 4 is a schematic view of the working principle of the magnetic lead screw of the present invention;
FIG. 5 is a schematic view of the working principle of the magnetic lead screw of the present invention;
FIG. 6 is a schematic view of a rotor permanent magnet configuration of the present invention;
FIG. 7 is a schematic diagram of a rotor permanent magnet structure according to the present invention;
FIG. 8 is a schematic view of the rotor shaft structure of the present invention;
fig. 9 is a schematic structural view of a rotor yoke according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
A magnetic force lead screw of mixed permanent magnetic material type, the magnetic force lead screw includes runner and rotor, the runner includes runner yoke iron 1 and runner permanent magnet 10, as shown in figure 1, figure 2, the rotor includes rotor spindle 2 and rotor permanent magnet 20, runner yoke iron 1 and rotor spindle 2 are formed by a kind of magnetic conductivity material with rigidity, the cross-section of runner yoke iron 1 is the regular polygon structure in the excircle, as shown in figure 9, runner yoke iron 1 is fitted outside the rotor, runner permanent magnet 10 is laminated with the inner surface of runner yoke iron 1;
the cross section of the rotor rotating shaft 2 is a regular polygon structure, as shown in fig. 8, the rotor permanent magnet 20 is wrapped on the surface of the rotor rotating shaft 2, the rotor rotating shaft 2 and the rotor yoke 1 are coaxial, the rotor rotating shaft 2 and the rotor yoke 1 form a gap 30, and the gap 30 is located between the rotor permanent magnet 10 and the rotor permanent magnet 20.
The section of the mover permanent magnet 10 is a regular polygon structure with an inner circle and an outer circle, as shown in fig. 7, the mover permanent magnet 10 sequentially includes a first mover axial permanent magnet 11, a first mover radial permanent magnet 12, a second mover axial permanent magnet 13 and a second mover radial permanent magnet 14, the first mover axial permanent magnet 11, the first mover radial permanent magnet 12, the second mover axial permanent magnet 13 and the second mover radial permanent magnet 14 are spirally distributed, the first mover axial permanent magnet 11 and the second mover axial permanent magnet 13 are opposite in magnetizing direction, and the first mover radial permanent magnet 12 and the second mover radial permanent magnet 14 are opposite in magnetizing direction.
The rotor permanent magnet 20 has the same structure as the rotor permanent magnet 10, and includes a first rotor axial permanent magnet 21, a first rotor radial permanent magnet 22, a second rotor axial permanent magnet 23, and a second rotor radial permanent magnet 24, as shown in fig. 6, the difference is that the cross section of the rotor permanent magnet 20 is in a regular polygon structure with an outer circle and an inner circle.
The rotor permanent magnet 10 and the rotor permanent magnet 20 are magnetized in a Halbach mode.
The first rotor radial permanent magnet 12, the second rotor radial permanent magnet 14, the first rotor radial permanent magnet 22 and the second rotor radial permanent magnet 24 are made of neodymium iron boron and other rare earth permanent magnet materials with strong residual magnetism, the first rotor axial permanent magnet 11, the second rotor axial permanent magnet 13, the first rotor axial permanent magnet 21 and the second rotor axial permanent magnet 23 are made of ferrite and other conventional permanent magnet materials, and the cost and the weight can be greatly reduced under the condition of not reducing the output force by using mixed permanent magnet materials.
The cross section of the rotor permanent magnet 10 is of an inner-circle outer-circle regular polygon structure, the cross section of the rotor permanent magnet 20 is of an outer-circle inner-circle regular polygon structure, so that the rotor permanent magnet is convenient to process and install so as to reduce relative displacement errors caused by installation, the permanent magnets are fixed simultaneously, mechanical strength is improved, assembly difficulty of the magnetic lead screw is effectively reduced, and meanwhile, compared with a traditional structure, the Halbach magnetizing mode and the use of a mixed permanent magnet material improve the output and the force density of the magnetic lead screw.
Since the magnetic fields in the rotor and the mover are both helical magnetic fields, linear motion and rotational motion can be converted to each other by magnetic field coupling, as shown in fig. 4 and 5, magnetic flux generated by the rotor permanent magnets 20 enters the mover permanent magnets 10 through the air gaps 30, passes through the adjacent permanent magnets, and returns to the adjacent rotor permanent magnets 20 through the air gaps 30. In fig. 4, when the relative displacement of the rotor and the mover is zero, i.e. the rotor and the mover are in the opposite positions, the output and the torque are both zero, and when the relative displacement of the rotor and the mover is half the pole pitch, the output is the maximum, as shown in fig. 5.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (6)
1. A magnetic force lead screw made of mixed permanent magnet materials comprises a rotor and a rotor, wherein the rotor comprises a rotor yoke and a rotor permanent magnet; the section of the rotor rotating shaft is of a regular polygon structure, and the rotor permanent magnet is wrapped on the surface of the rotor rotating shaft;
the cross section of the rotor permanent magnet is of a regular polygon structure with an inner circle and an outer circle, the rotor permanent magnet sequentially comprises a first rotor axial permanent magnet, a first rotor radial permanent magnet, a second rotor axial permanent magnet and a second rotor radial permanent magnet, the first rotor axial permanent magnet, the first rotor radial permanent magnet, the second rotor axial permanent magnet and the second rotor radial permanent magnet are distributed spirally, the magnetizing directions of the first rotor axial permanent magnet and the second rotor axial permanent magnet are opposite, and the magnetizing directions of the first rotor radial permanent magnet and the second rotor radial permanent magnet are opposite;
the rotor permanent magnet and the rotor permanent magnet have the same structure and comprise a first rotor axial permanent magnet, a first rotor radial permanent magnet, a second rotor axial permanent magnet and a second rotor radial permanent magnet, and the rotor permanent magnet is characterized in that the section of the rotor permanent magnet is in a regular polygon structure with an outer circle and an inner circle;
the first rotor radial permanent magnet, the second rotor radial permanent magnet, the first rotor radial permanent magnet and the second rotor radial permanent magnet are made of rare earth permanent magnet materials with residual magnetism, and the first rotor axial permanent magnet, the second rotor axial permanent magnet, the first rotor axial permanent magnet and the second rotor axial permanent magnet are made of ferrite permanent magnet materials.
2. The magnetic screw according to claim 1, wherein the rotor yoke and the rotor shaft are made of a magnetically permeable material having rigidity.
3. The magnetic screw of claim 1, wherein the rotor shaft and the rotor yoke are concentric, and the rotor shaft and the rotor yoke form a gap between the rotor permanent magnet and the rotor permanent magnet.
4. The magnetic force screw of mixed permanent magnet material type according to claim 1, wherein the rotor permanent magnet and the rotor permanent magnet are both Halbach magnetized.
5. The magnetic force lead screw of mixed permanent magnetic material type of claim 1, wherein the magnetic fields of the rotor and the mover are both helical magnetic fields, linear motion and rotational motion are converted into each other by magnetic field coupling, and magnetic flux generated by the rotor permanent magnet enters the mover permanent magnet through the air gap, passes through the adjacent permanent magnet, and then returns to the adjacent rotor permanent magnet through the air gap.
6. The magnetic screw according to claim 1 or 5, wherein the force and torque are zero when the relative displacement between the rotor and the mover is zero, and the force is the largest when the relative displacement between the rotor and the mover is half the pole pitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110662446.0A CN113300571B (en) | 2021-06-15 | 2021-06-15 | Mixed permanent magnet material type magnetic screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110662446.0A CN113300571B (en) | 2021-06-15 | 2021-06-15 | Mixed permanent magnet material type magnetic screw |
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| Publication Number | Publication Date |
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| CN113300571A CN113300571A (en) | 2021-08-24 |
| CN113300571B true CN113300571B (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110662446.0A Active CN113300571B (en) | 2021-06-15 | 2021-06-15 | Mixed permanent magnet material type magnetic screw |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100611454B1 (en) * | 2004-10-08 | 2006-08-10 | 주식회사 대우일렉트로닉스 | Rotor of outer rotor type motor |
| GB2519499B (en) * | 2013-07-26 | 2017-11-01 | Ricardo Uk Ltd | A magnetic gear |
| CN106612046A (en) * | 2015-10-23 | 2017-05-03 | 大银微系统股份有限公司 | Rotary and linear motion mechanism |
| EP4059117A4 (en) * | 2019-11-14 | 2024-01-10 | Nat Oilwell Varco Lp | Helical magnetic arrangement for a magnetic linear actuator |
| CN111555492B (en) * | 2020-04-29 | 2021-12-28 | 南京航空航天大学 | Parallel-magnetizing small-rare-earth-combination local Halbach array high-speed permanent magnet motor |
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