CN1866700B - Cylindrical permanent magnetic system - Google Patents
Cylindrical permanent magnetic system Download PDFInfo
- Publication number
- CN1866700B CN1866700B CN2006100893948A CN200610089394A CN1866700B CN 1866700 B CN1866700 B CN 1866700B CN 2006100893948 A CN2006100893948 A CN 2006100893948A CN 200610089394 A CN200610089394 A CN 200610089394A CN 1866700 B CN1866700 B CN 1866700B
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- magnet array
- annular permanent
- magnetic
- air gap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000004907 flux Effects 0.000 claims abstract description 24
- 230000005415 magnetization Effects 0.000 claims abstract description 22
- 230000000737 periodic effect Effects 0.000 claims abstract description 14
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 10
- 230000004323 axial length Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000003491 array Methods 0.000 abstract description 3
- 239000012141 concentrate Substances 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Linear Motors (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
一种圆筒型永磁磁系，由轴向齐平、周期性的内环形永磁阵列和外环形永磁阵列同轴相对组成，在内、外环形永磁阵列之间的环形气隙的任意轴截面形成正弦波形周期性的磁场。内环形永磁阵列或外环形永磁阵列由若干个等径向厚度的钕铁硼磁环轴向无间距周期性迭加组成，其几何结构和磁化方向具有轴对称性和周期性。本发明提供的磁场可满足圆筒型永磁直线电机对正弦波形周期性径向气隙磁场的要求；轴向齐平的内、外环形永磁阵列同轴相对布置，将磁通集中到有限的环形气隙中，减小了气隙磁阻，削弱了气隙磁密的轴向分量，加强了气隙磁密的径向分量，改善了气隙磁密的空间分布形态，使气隙磁密以径向分量为主，提高了气隙磁密的有效利用率。
A cylindrical permanent magnet system, which is composed of an axially flush and periodic inner annular permanent magnet array and an outer annular permanent magnet array coaxially facing each other, and the annular air gap between the inner and outer annular permanent magnet arrays Any shaft section forms a periodic magnetic field with a sinusoidal waveform. The inner annular permanent magnet array or the outer annular permanent magnet array is composed of several NdFeB magnetic rings with equal radial thickness, which are periodically superposed in the axial direction without spacing, and its geometric structure and magnetization direction are axially symmetric and periodic. The magnetic field provided by the invention can meet the requirements of the cylindrical permanent magnet linear motor for the sinusoidal waveform periodic radial air gap magnetic field; the axially flush inner and outer ring permanent magnet arrays are coaxially arranged to concentrate the magnetic flux to a limited In the annular air gap, the air gap reluctance is reduced, the axial component of the air gap magnetic density is weakened, the radial component of the air gap magnetic density is strengthened, the spatial distribution of the air gap magnetic density is improved, and the air gap The magnetic density is dominated by the radial component, which improves the effective utilization of the air gap magnetic density.
Description
Technical field
The present invention relates to a kind of magnetic system of cylinder permanent magnetic line motor, particularly can produce the cylindrical permanent magnetic system of sinusoidal waveform periodical magnetic filed.
Technical background
Many devices all need the periodic magnetic field of sinusoidal waveform.U.S. Pat 006057656A discloses a kind of combination permanent magnet array, produces the periodic magnetic field of sinusoidal waveform in 2 formed air gaps of oppositely arranging relatively of permanent magnet array, can be used for the straightway of electron accelerator.As shown in Figure 1, combination permanent magnet array 1 and 2 reverse relative arrangements, each combination permanent magnet array is made up of basic magnetic patch and several utmost point magnetic patch, tooth and groove are arranged on the basic magnetic patch, and groove is corresponding with utmost point magnetic patch, and promptly utmost point magnetic patch embeds in the groove of basic magnetic patch; From 2a to 21, magnetizing direction is by 90 ° of variations, and the magnetizing direction of the utmost point magnetic patch in the 1 corresponding groove with 2 is opposite.It is the magnetic field of the Y direction of sinusoidal waveform period profile that this arrangement, the rectangle air gap between two arrays have formed along the Z direction.But, when needed effective magnetic field space is an annulus or when cylindrical, as the magnetic field space of cylinder type permanent magnet linear synchronous motor annular, this arrangement does not just satisfy requirement; And basic magnetic patch is except that tooth, and remaining part is not utilized, and this just causes waste inevitably, has increased cost of manufacture.
Application number is that 2005100865378.5 Chinese patent has proposed a kind of permanent-magnetic cylindrical type DC linear motor, 2n+1 the magnetic Nd-Fe-B ring that its stator magnetic circuit is changed vertically according to certain rules by magnetizing direction superposes vertically and forms, magnetic circuit forms the radial magnetic field that axially distributes for flat-topped wave by magnet ring itself and air gap closure at the mover coil place.This magnetic structure is applicable to the cylindrical permanent DC linear motor, but can not satisfy the requirement of cylinder type permanent magnet linear synchronous motor or cylinder type permanent magnet linear induction machine offset of sinusoidal wave period radial magnetic field.Cylinder type permanent magnet linear synchronous motor or cylinder type permanent magnet linear induction machine adopt N at present, the S pole axis is axial to the permanent-magnetic clamp generation of mutual arrangement is the periodic magnetic field of sinusoidal waveform.This magnetic structure not only produces radial magnetic field in air gap, also produce the axial magnetic field of suitable vast scale, and in cylinder type permanent magnet linear synchronous motor or cylinder type permanent magnet linear induction machine, what need is the close component of radial air gap magnetic, thereby the close effective rate of utilization of this magnetic air gap magnetic is low.In addition, axial magnetic field in this magnetic circuit changes for the sinusoidal waveform cycle vertically, when with metallic conductor generation relative motion, in metallic conductor, produce eddy current, send a large amount of heat, influence the stability of motor, thereby in cylinder permanent magnetic line motor, to weaken the axial component of air gap flux density as possible, improve the radial component of air gap flux density.In theory, as long as increase the radial thickness and the axial length of permanent-magnetic clamp, just can improve the magnetic potential of this magnetic circuit, thereby raising air gap flux density, but during practical application, along with the increase of permanent-magnetic clamp radial thickness and axial length, the volume and weight of magnet also increases rapidly, can cause the cost of making magnet to increase sharply; The more important thing is, when air-gap field constantly strengthens and during greater than the coercive force of permanent magnetic material, degaussing just takes place in part near air gap in the magnetizing direction permanent-magnetic clamp opposite with air-gap magnetic field direction inevitably, the degaussing phenomenon produces irreversibly the magnetic of permanent magnet and damages, thereby makes air-gap field can't reach the form of expection; In addition, the high-intensity magnetic field identical with the permanent magnet magnetizing direction will cause the saturated phenomenon of permanent magnetic material, this will cause the working point of permanent magnetic material to be in the first quartile of its magnetic hysteresis loop rather than second quadrant of operate as normal, and the many difficult problems on these analyses, the designing technique make this magnetic circuit be difficult to realize high-intensity magnetic field.
Summary of the invention
For overcoming the shortcoming of prior art, the present invention proposes a kind of cylindrical permanent magnetic system, but this permanent magnetic system polarization along circumferentially constant, axially be the periodic magnetic field of sinusoidal waveform, be applicable to the cylinder permanent magnetic line motor of long stroke, high thrust.
Purpose of the present invention is achieved through the following technical solutions.
Cylindrical permanent magnetic system of the present invention by axially flush, periodic in annular permanent magnet array and outer ring permanent magnet array coaxial relative composition, the arbitrary axis cross section of the annulus gap between inside and outside annular permanent magnet array forms the periodic magnetic field of sinusoidal waveform.Interior annular permanent magnet array or outer ring permanent magnet array by several etc. radially the magnetic Nd-Fe-B ring of thickness axially forms apart from superposition periodically continuously, interior annular permanent magnet array and outer ring permanent magnet array geometry and the direction of magnetization have axial symmetry and periodicity.Each is made up of the inside and outside annular permanent magnet array of one-period n+1 magnetic Nd-Fe-B ring, from the bottom up, in the interior annular permanent magnet array in i magnet ring and the outer ring permanent magnet array i ring axial magnetic flush; Arbitrary shaft section, the direction of magnetization of interior annular permanent magnet array or the adjacent magnet ring of outer ring permanent magnet array differs 180 °/n, the end magnet ring of interior annular permanent magnet array or outer ring permanent magnet array promptly No. 1 and n+1 magnet ring the direction of magnetization for radially and direction opposite, be 0 ° or 180 °; The magnetizing direction of corresponding end magnet ring is identical in the inside and outside annular permanent magnet array; The magnetizing direction of the end magnet ring that the interior annular permanent magnet array of adjacent periods or outer ring permanent magnet array are adjacent is identical.Interior annular permanent magnet array or outer ring permanent magnet array are bonded as interior with special gelatin or the outer magnetic ring body, and fixing with the metal-back chucking of non-magnetic conduction.
Because the periodicity of cylindrical permanent magnetic system of the present invention describes an one cycle below.
Interior annular permanent magnet array adopts the external magnetic circuit structure, and from the bottom up, each magnet ring is by changing the direction of magnetization of i magnet ring clockwise
Or
Working gas gap is the annular space of interior annular permanent magnet array; The outer ring permanent magnet array adopts the internal magnetic type magnetic line structure, and from the bottom up, each magnet ring is by changing the direction of magnetization of i magnet ring counterclockwise
Or
Working gas gap is the interior annular space of outer ring permanent magnet array.Thereby the annulus gap that is positioned between inside and outside annular permanent magnet array is the effective working space of cylindrical permanent magnetic system of the present invention.
Magnetic circuit of the present invention is made up of inside and outside annular permanent magnet array and the annulus gap between them.According to magnetic circuit theorem, when the coercive force of Nd-Fe-Bo permanent magnet material is Hc, the axial length of interior annular permanent magnet array or i magnet ring of outer ring permanent magnet array is Li, when radial thickness is Di, arbitrary shaft section, the radially magnetic potential component F ri=|Hc.Di.cos θ that interior annular permanent magnet array or i magnet ring of outer ring permanent magnet array provide
i|, axial magnetic potential component F zi=|Hc.Li.sin θ
i|; The magnetic potential that the end magnet ring of interior annular permanent magnet array or outer ring permanent magnet array provides for radially and direction opposite, the direction of the magnetic potential that all the other n-1 magnet ring provides is between radial and axial; Identical, the axial magnetic potential component direction of radially magnetic potential component direction that the corresponding magnet ring of inside and outside annular permanent magnet array provides is opposite, and hold the magnet rings except that 2 in interior annular permanent magnet array or the outer ring permanent magnet array, the axial magnetic potential component direction that remaining n-1 magnet ring provides is identical.Therefore, inside and outside annular permanent magnet array is not only sources of magnetic flux, has also formed the part of magnetic circuit; Arbitrary shaft section, the axial magnetic potential component that the corresponding magnet ring of inside and outside annular permanent magnet array provides cancels out each other, magnetic potential component mutual superposition then radially, thereby weakened the axial component of air gap flux density, strengthened the radial component of air gap flux density, made in the annular working air gap radial component based on air gap flux density; The air gap flux density radial component distributes for sinusoidal waveform vertically, and has 0 value point, utilizes this characteristic to control cylinder permanent magnetic line motor; Regulate the axial length L i of each magnet ring and the radial distance of radial thickness Di and inside and outside annular permanent magnet array, the spatial distribution form that can regulate air gap flux density.
The geometry of cylindrical permanent magnetic system of the present invention and the direction of magnetization all have axial symmetry and periodically, thereby annulus gap magnetic field has axial symmetry and periodically, and promptly air-gap field circumferentially has unipolarity, axially has periodically.
Advantage of the present invention: air gap flux density height, peak value can reach more than the 1T, and air gap flux density spatial distribution form is good, and the effective rate of utilization height of air gap flux density; Simple in structure, fabrication and installation are easy; In light weight, basic magnetic leakage free, anti-degaussing ability is strong; Adjustability is good, and is flexible multi-purpose, is applicable to the cylinder permanent magnetic line motor of long stroke, high thrust.
Description of drawings
Fig. 1 is the magnetic circuit arrangement of U.S. Pat 006057656A, and arrow is the direction of magnetization among the figure.
Fig. 2 is the structural representation of the specific embodiment of the invention.1 is interior annular permanent magnet array; 2 is annulus gap; 3 is the outer ring permanent magnet array; Z is axial; R is a radial direction.
Fig. 3 is the magnetic structure on a certain section RZ plane of the specific embodiment of the invention.Arrow is represented the magnet ring magnetizing direction among the figure.
Fig. 4 is that the magnetic line of force on the plane of corresponding RZ with Fig. 3 distributes.
Fig. 5 is the distribution vertically of arbitrary shaft section interior annular permanent magnet array outer surface 20mm place's air gap flux density of distance, and wherein Br and Bz are respectively the radial component and the axial component of air gap flux density.
Embodiment
Further specify the present invention below in conjunction with specific embodiment and accompanying drawing.
Fig. 2 is the structural representation of the specific embodiment of the invention.It is by annular permanent magnet array 1 in periodic, annulus gap 2 and 3 coaxial relative compositions of periodic outer ring permanent magnet array.Interior annular permanent magnet array 1 and outer ring permanent magnet array 3 axially flush, and are that the magnetic Nd-Fe-B ring of 50mm is axially formed apart from superposition continuously by several radial thicknesss all, and the geometry and the direction of magnetization have axial symmetry and periodically.Interior annular permanent magnet array 1 adopts the external magnetic circuit structure, and working gas gap is the annular space of interior annular permanent magnet array 1; Outer ring permanent magnet array 3 adopts the internal magnetic type magnetic line structure, and working gas gap is the interior annular space of outer ring permanent magnet array 3, thereby the annulus gap between interior annular permanent magnet array 1 and outer ring permanent magnet array 32 is the effective magnetic field working space.In the one-period, interior annular permanent magnet array 1 or outer ring permanent magnet array 3 are made up of the individual magnetic Nd-Fe-B ring of 5 (n=4); From the bottom up, i magnet ring of interior annular permanent magnet array 1 and i ring axial magnetic of outer ring permanent magnet array 3 flush, the end magnet ring of wherein interior annular permanent magnet array 1 or outer ring permanent magnet array 3, promptly the axial length of No. 1 and No. 5 magnet ring is 25mm, and the axial length of all the other 2,3, No. 4 magnet rings is 50mm; From the bottom up, the direction of magnetization of interior annular permanent magnet array 1 from No. 5 magnet rings of No. 1 magnet ring to the by changing clockwise, arbitrary shaft section, the direction of magnetization of adjacent magnet ring differs 180 °/4=45 °; The direction of magnetization of outer ring permanent magnet array 3 from No. 5 magnet rings of No. 1 magnet ring to the by changing counterclockwise, arbitrary shaft section, the direction of magnetization of adjacent magnet ring differs 180 °/4=45 °.
Fig. 3 is the magnetic circuit of a certain section arbitrary shaft section embodiment illustrated in fig. 2, and this section magnetic circuit has 6 cycles.As can be seen, period 1 T1 and big period T 1+T2 of T2 composition second round, T3+T4 and T5+T6 are that T1+T2 is in axial repetition.Among the T1, from the bottom up, the direction of magnetization θ of i magnet ring of interior annular permanent magnet array 1
i=-45 °. (i-1), the direction of magnetization θ of i magnet ring of outer ring permanent magnet array 3
i=45 °. (i-1); Among the T2, from the bottom up, the direction of magnetization θ of i magnet ring of interior annular permanent magnet array 1
i=180 °-45 °. (i-1), the direction of magnetization θ of i magnet ring of outer ring permanent magnet array 3
i=180 °+45 ° (i-1).The magnetizing direction of n-2-1 among n-1-5 among the T1 and the T2 is identical, is 180 °; The magnetizing direction of w-2-1 among w-1-5 among the T1 and the T2 is identical, is 180 °.Among the T1, the n-1-1 of interior annular permanent magnet array 1, the n-1-5 magnetizing direction with w-1-1, the w-1-5 of outer ring permanent magnet array 3 respectively are identical; Magnetizing direction is that the magnetizing direction of axial n-1-3 and w-1-3 is opposite.In among the T1 magnetizing direction of the end magnet ring n-1-1 of annular permanent magnet array 1 and n-1-5 for radially and direction opposite; The end magnet ring w-1-1 of outer ring permanent magnet array 3 and the magnetizing direction of w-1-5 for radially and direction opposite.
Fig. 4 distributes with the magnetic line of force on the corresponding RZ of Fig. 3 plane.As shown in Figure 4, in magnetic circuit of the present invention is made up of interior annular permanent magnet array 1, outer ring permanent magnet array 3 and the annulus gap between them 2.In each cycle, interior annular permanent magnet array 1, outer ring permanent magnet array 3 and corresponding annular air gap 2 all form the magnetic loop of a closure.In the annulus gap 2, magnetic line of force major part is radially, and is seldom axial.
When the interior diameter of interior annular permanent magnet array 1 is 90mm, the interior diameter of outer ring permanent magnet array 3 is 270mm; The Hc=1100kA/m of Nd-Fe-Bo permanent magnet material, during Br=1.4T, arbitrary shaft section apart from interior annular permanent magnet array 1 outer surface 20mm place air gap flux density distribution vertically as shown in Figure 5.Among Fig. 50 of abscissa corresponding with Fig. 3 middle magnetic ring n-1-1 lower surface.As can be seen, air gap flux density radial component Br is the sinusoidal waveform period profile vertically, with the corresponding wavelength of T1 be 200mm, with the corresponding wavelength of T1+T2 be 400mm, form 3 crests, peak-to-peak value be (0.95T ,-0.95T); Axial component Bz is the cosine waveform period profile vertically, forms 3 crests, peak-to-peak value be (0.3T ,-0.3T).As seen, cylindrical permanent magnetic system of the present invention is existing radially by the magnetizing direction on the arbitrary axis cross section, also have radial and axial between at any angle and according to certain rules the interior annular permanent magnet array 1 and the outer ring permanent magnet array 3 that change of cycle realized the magnetic field that the sinusoidal waveform cycle changes in the annular working air gap, satisfied the requirement in cylinder permanent magnetic line motor offset of sinusoidal wave period radial air gap magnetic field; Interior annular permanent magnet array 1 that axially flushes and outer ring permanent magnet array 3 coaxial positioned opposite, with flux concentrating in limited annulus gap 2, reduced air-gap reluctance, weakened the axial component of air gap flux density greatly, strengthened the radial component of air gap flux density, improved the spatial distribution form of air gap flux density, made air gap flux density, improved the effective rate of utilization of air gap flux density based on radial component.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100893948A CN1866700B (en) | 2006-06-23 | 2006-06-23 | Cylindrical permanent magnetic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100893948A CN1866700B (en) | 2006-06-23 | 2006-06-23 | Cylindrical permanent magnetic system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1866700A CN1866700A (en) | 2006-11-22 |
| CN1866700B true CN1866700B (en) | 2010-12-22 |
Family
ID=37425608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100893948A Expired - Fee Related CN1866700B (en) | 2006-06-23 | 2006-06-23 | Cylindrical permanent magnetic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1866700B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741213B (en) * | 2010-02-21 | 2012-05-23 | 哈尔滨工业大学 | Cylindrical permanent magnet linear motor |
| CN106787072A (en) * | 2016-12-27 | 2017-05-31 | 北京工业大学 | A kind of marine fluid electricity generation system |
| CN114429848B (en) * | 2022-01-28 | 2022-12-13 | 湖南大学 | Multipolar tubular permanent magnet and assembly device and assembly method thereof |
-
2006
- 2006-06-23 CN CN2006100893948A patent/CN1866700B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1866700A (en) | 2006-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101127474B (en) | High Power Density Moving Coil Permanent Magnet Linear Motor | |
| Ling et al. | Design optimization and test of a radially magnetized magnetic screw with discretized PMs | |
| CN102185458B (en) | High-precision slotless permanent magnet motor | |
| CN201055840Y (en) | Double-magnetic circuit structure of large range electromagnetism vibration table | |
| CN107769622B (en) | A kind of axial magnetic formula motor | |
| WO2021189595A1 (en) | Multi-degree-of-freedom magnetic field modulation-type magnetic screw actuator and integrated design method therefor | |
| CN106838004B (en) | A kind of implicit Lorentz force magnetic bearing of Three Degree Of Freedom | |
| CN1866700B (en) | Cylindrical permanent magnetic system | |
| Zhang et al. | Design and analysis of a novel frequency modulation secondary for high-speed permanent magnet linear synchronous motor | |
| CN108900046B (en) | Installation method of cylindrical Halbach permanent magnet array | |
| CN106130214B (en) | A kind of fault-tolerant permanent magnetism vernier cylinder motor of electromagnetic suspension | |
| CN101741215A (en) | A permanent magnet synchronous linear motor | |
| CN104319975A (en) | Single-groove unipolar cylindrical moving-magnet linear alternating-current generator | |
| CN101789675A (en) | Secondary of cylindrical permanent-magnet linear motor | |
| CN102005892B (en) | Electromagnetic linear actuator applying axial magnetizing permanent | |
| CN103199669B (en) | Heterogeneous Long Distances cylinder type flux suitching type linear electric motors | |
| CN1862718B (en) | Bipolar permanent magnet | |
| CN1941573B (en) | Single-pole permanent-magnetic cylindrical DC linear motor | |
| CN101789677B (en) | Secondary structure of low-thrust waved sine wave permanent magnet liner synchronous motor | |
| CN104682660B (en) | A magnetic gear with axial magnetic field modulation | |
| CN201176407Y (en) | Magnetic focusing multiple-unit combination magnetizer | |
| CN109450219B (en) | A moving magnet proportional electromagnet with axial magnetization | |
| CN101544417B (en) | Magnetic focusing multi-unit combined magnetizer | |
| CN206962680U (en) | A kind of cylindrical permanent-magnet linear motor | |
| CN105161249B (en) | A kind of permanent magnetism solenoid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20110623 |