CN209787020U - Halbach array eccentric magnetic gear - Google Patents
Halbach array eccentric magnetic gear Download PDFInfo
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- CN209787020U CN209787020U CN201920761584.2U CN201920761584U CN209787020U CN 209787020 U CN209787020 U CN 209787020U CN 201920761584 U CN201920761584 U CN 201920761584U CN 209787020 U CN209787020 U CN 209787020U
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- permanent magnet
- speed rotor
- low
- outer stator
- halbach array
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Abstract
A Halbach array eccentric magnetic gear comprises a high-speed rotor iron core, a low-speed rotor iron core and an outer stator iron core, wherein a bearing is arranged between the high-speed rotor iron core and the low-speed rotor iron core; and the low-speed rotor permanent magnet and the outer stator permanent magnet adopt a Halbach array magnetizing mode. The utility model aims to solve the technical problem that a Halbach array eccentric magnetic force gear is provided, through changing the permanent magnet mode of magnetizing, simplifies the effective structure of magnetic force gear, reduces the torque ripple when realizing its high torque density.
Description
Technical Field
The utility model relates to a magnetism gear, especially a Halbach array eccentric magnetic force gear.
Background
Magnetic gears are a general name for a series of systems that rely on magnetic field coupling to achieve the same or even better transmission effect as mechanical gears. Foreign research on magnetic gears began at the earliest in 1913, filed and patented by b. However, the magnetic gear is affected by the development degree of the permanent magnet, so that the earliest serious defects of poor transmission capability, low torque density and the like of the magnetic gear are caused, and attention is not paid. Since then, in 1940, h.t.faus, in turn, mentioned magnetic gears in a patent. However, at this time, the development of permanent magnets has severely limited the research of such magnetic gears. The magnetic force of the ferrite magnet is not enough to support the development of the magnetic gear, until the occurrence of the neodymium-boron-iron permanent magnet in 1980, the research path of the magnetic gear is continuously developed.
Based on the development of permanent magnets, the japanese scholars s.oshima utility model discloses a coaxial magnetic gear in 1981, but the torque density and the transmission ratio of the gear are low, and the application is limited. Subsequently, japanese scholars s.kikuchi and k.tsurumoto proposed magnetic internal gears in the papers in 1987 and magnetic worm gears in 1993. S.kikuchi and k.tsurumoto in 1994 again propose magnetic bevel gear drives. In 2001, magnetic field modulated magnetic gears which are now widely used and which greatly improve torque and transmission ratio were proposed by british scholars k.atalah and d.howe. After that, magnetic field modulation type magnetic gears have been the subject of study by researchers. In 2005, the teaching of d.howe changed the rotating motion mode of the magnetic gear, and proposed a linear magnetic field modulation type magnetic gear. In the same year, P.O.Rasmussen is inspired by a magnetism-gathering permanent magnet motor, and provides a tangential magnetizing magnetic field modulation type magnetic gear. In 2006, d.howe also studied an axial magnetizing magnetic field modulation type magnetic gear. Professor j.rens from sheffield, uk in 2010, has disclosed magnetic force harmonic gears, the transmission ratio of which may be higher than 1: 20.
Magnetic gears have also been studied in China, and professor Zhao Han has studied the permanent magnet units of magnetic gears in 2000 in two-dimensional and three-dimensional modeling calculations. In 2005, a concentric magnetic field modulation type magnetic gear magnetized by Halbach was studied in an effort of a large number of domestic scholars. In 2008, professor of the full-Yongquai has researched a permanent magnet-magnetic resistance type magnetic gear, and in the same year, taiwan scholars have researched a permanent magnet planetary gear. In 2014, hong kong university k.t.chau developed a novel magnetic gear with changeable transmission ratio. In addition, in China, a large number of magnetic gears are applied to various fields, for example, the magnetic gears are applied to the aspects of motors, artificial hearts, wind power generation and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a Halbach array eccentric magnetic force gear is provided, through changing the permanent magnet mode of magnetizing, simplifies the effective structure of magnetic force gear, reduces the torque ripple when realizing its high torque density.
in order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a Halbach array eccentric magnetic gear comprises a high-speed rotor iron core, a low-speed rotor iron core and an outer stator iron core, wherein a bearing is arranged between the high-speed rotor iron core and the low-speed rotor iron core; and the low-speed rotor permanent magnet and the outer stator permanent magnet adopt a Halbach array magnetizing mode.
preferably, the outer stator core is formed by laminating silicon steel sheets.
Preferably, the outer stator permanent magnet is composed of 64 independent radial polarized permanent magnets which are uniformly distributed along the circumferential direction, a tangential polarized permanent magnet is arranged between two adjacent radial polarized permanent magnets, and the number of pole pairs of a Halbach array composed of 64 permanent magnets is 2.
Preferably, the permanent magnet under each pole of the low-speed rotor permanent magnet is divided into 3 small permanent magnets, and the permanent magnet under each pole of the outer stator permanent magnet is divided into 2 small permanent magnets.
Preferably, the number of pole pairs P3 of the outer stator permanent magnet and the number of pole pairs P of the low-speed rotor permanent magnet2and the number of air gap variation cycles P1Satisfy P3＝P1+P2The relationship (2) of (c).
The utility model provides a Halbach array eccentric magnetic gear, high-speed rotor are rotatory to drive the low-speed rotor rotation through the bearing, and the low-speed rotor receives stator magnetic field to influence, and the rotation realizes torque transmission effect simultaneously.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
Compared with the existing magnetic field modulation type magnetic gear structure, the eccentric type harmonic magnetic gear with high torque density provided by the utility model adopts the Halbach magnetizing mode for the permanent magnets of the outer stator and the low-speed rotor, utilizes the advantage of the Halbach magnetizing mode that the harmonic content in the magnetic field is less, and realizes higher torque density under the condition of less harmonic content;
The utility model provides an eccentric harmonic magnetic gear with high torque density, the outer stator and the low-speed rotor are in different circle centers; because the inner permanent magnet and the outer permanent magnet are non-concentric circles, the air gap between the outer stator and the low-speed rotor changes periodically, and the structure is even suitable for being used when the transmission ratio is more than 20:1, and the torque transmission capability is improved.
Drawings
The invention will be further explained with reference to the following figures and examples:
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the Halbach array magnetizing mode of the outer stator permanent magnet and the low-speed rotor permanent magnet of the present invention;
Fig. 3 is a schematic view of the center of the outer stator and the low-speed rotor according to the present invention;
FIG. 4 is a comparison of the radial magnetic density of the magnetizing air gap of the present invention with that of the conventional magnetizing apparatus;
FIG. 5 is a comparison of the tangential magnetic density of the magnetizing air gap of the present invention and the conventional magnetizing apparatus;
FIG. 6 is a radial flux density component plot from Fourier decomposition of FIG. 4;
FIG. 7 is a tangential flux density component plot obtained by Fourier decomposition of FIG. 5;
fig. 8 is a static torque diagram of the present invention at a different angle from the conventional magnetizing.
Detailed Description
As shown in fig. 1, a Halbach array eccentric magnetic gear comprises a high-speed rotor core 6, a low-speed rotor core 4 and an outer stator core 1 from inside to outside, wherein a bearing 5 is arranged between the high-speed rotor core 6 and the low-speed rotor core 4, a low-speed rotor permanent magnet 3 is arranged on the outer side of the low-speed rotor core 4, an outer stator permanent magnet 2 is arranged on the inner side of the outer stator core 1, and a non-uniform air gap is formed between the low-speed rotor permanent magnet 3 and the outer stator permanent magnet 2; and the low-speed rotor permanent magnet 3 and the outer stator permanent magnet 2 adopt a Halbach array magnetizing mode.
preferably, the outer stator core 1 is formed by laminating silicon steel sheets.
Preferably, the outer stator permanent magnet 2 is composed of 64 independent radial polarized permanent magnets which are uniformly distributed along the circumferential direction, a tangential polarized permanent magnet is arranged between two adjacent radial polarized permanent magnets, and the number of pole pairs of a Halbach array composed of 64 permanent magnets is 2.
Preferably, the permanent magnet under each pole of the low-speed rotor permanent magnet 3 is divided into 3 small permanent magnets, and the permanent magnet under each pole of the outer stator permanent magnet 2 is divided into 2 small permanent magnets.
Preferably, the number of pole pairs P3 of the outer stator permanent magnet 2 and the number of pole pairs P of the low-speed rotor permanent magnet 32And the number of air gap variation cycles P1Satisfy P3＝P1+P2the relationship (2) of (c).
As shown in fig. 2, the schematic view of the magnetizing directions of the outer stator permanent magnet and the low-speed rotor permanent magnet is shown, and by adopting the magnetizing directions, the advantage of low harmonic content of the magnetic field in the Halbach magnetizing mode is utilized, and high torque density is realized under the condition of low harmonic content.
As shown in FIG. 3, O1Is the center of the outer stator, O2The eccentric structure is adopted as the center of a circle of the low-speed rotor, so that the torque density is increased, and the eccentric structure is suitable for the condition that the transmission ratio is greater than 20: 1.
pole pair number P of outer stator permanent magnet3number of pole pairs P of permanent magnet of low-speed rotor2Number of cycles P of air gap variation1Satisfies the following formula (1):
P3＝P1+P2 (1)
The high-speed rotor is in sliding contact with the low-speed rotor through the bearing, when the high-speed rotor rotates, the low-speed rotor is driven to rotate coaxially, the non-uniform air gap rotates along with the high-speed rotor, the air gap distribution is changed, the low-speed rotor can rotate to maintain the original magnetic field condition and torque output, and power transmission is achieved through the magnetic field. Therefore, the low-speed rotor not only rotates around the center of the high-speed rotor, but also revolves around the center of the outer stator, and the high-speed rotor is equivalent to a harmonic generator in a mechanical gear. The air gap length satisfies the following formula (2):
Where gmax is the maximum air gap length, gmin is the minimum air gap length, wh is the angular velocity of the high speed rotor, P1Is the number of varying periods of the non-uniform air gap and theta is the angle through which the inner rotor rotates.
The asynchronous space harmonics of the transmitted torque couple with the static magnetic field generated by the stator, so that the transmission ratio Gr satisfies the following formula (3):
P1And P2The number of non-uniform air gap cycles and the pole pair number of the permanent magnet of the low-speed rotor are respectively.
In this embodiment, the non-uniform number of air gap variation periods P11, the pole pair number P of the permanent magnet of the low-speed rotor215, the number of pole pairs P of the permanent magnet of the outer stator3The transmission ratio of the eccentric harmonic magnetic gear, from which this high torque density is obtained, is 1:15, 16.
Compare with the eccentric formula harmonic magnetic force gear of the radial mode of magnetizing of current tradition, the embodiment of the utility model provides an this kind of eccentric formula harmonic magnetic force gear has realized higher output torque density and lower torque ripple.
Experimental data show that under the same volume and permanent magnet consumption, compared with an eccentric harmonic magnetic gear in a traditional radial magnetizing mode, the output torque density of the magnetic gear provided by the embodiment is increased by 110%.
As shown in FIG. 4, compared with the conventional magnetizing method, the Halbach array magnetizing method has the advantages that the radial flux density waveform profile of the air gap is approximately the same and is slightly improved.
as shown in FIG. 5, compared with the conventional magnetizing method, the Halbach array magnetizing method has obviously enhanced air gap tangential magnetic density.
as shown in fig. 6, in radial magnetic density fourier analysis and a Halbach array magnetizing mode, compared with the conventional magnetizing mode, the harmonic times 13, 14, 15 and 16 are effective harmonics of torque transmission, and are all obviously enhanced. Harmonic numbers 43, 44, 45, 46, and 47 are higher harmonics, and all of them are significantly reduced and almost disappeared.
As shown in fig. 7, in tangential flux density fourier analysis and a Halbach array magnetizing mode, compared with the conventional magnetizing mode, the harmonic times 13, 14, 15 and 16 are effective harmonics of torque transmission, and are all obviously enhanced. Harmonic numbers 43, 44, 45, 46, and 47 are higher harmonics, and all of them are significantly reduced and almost disappeared. As can be seen from the figures 6 and 7, the air gap flux density amplitude of the magnetic gear under Halbach magnetizing is larger than that of the traditional magnetizing, and the harmonic frequency is obviously reduced.
As shown in fig. 8, the static torque characteristic is one of the most important characteristic parameters of the magnetic gear. The static torque characteristic is a torque characteristic in an air gap when the outer stator is fixed and the low-speed rotor is rotated by a certain angle step by step. The torque characteristics of the low-speed rotor which is rotated 3.6 degrees each time are shown in fig. 8, except that at 33 degrees, the static torque is slightly reduced, and the static torque is greatly increased at other positions. Therefore, compared with the traditional magnetized magnetic gear, the Halbach array magnetizing method has the advantage that the static torque is obviously enhanced.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be considered as limitations of the present invention, and the protection scope of the present invention should be defined by the technical solutions described in the claims, and includes equivalent alternatives of technical features in the technical solutions described in the claims. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.
Claims (4)
1. A Halbach array eccentric magnetic gear is characterized in that: the permanent-magnet synchronous motor comprises a high-speed rotor core (6), a low-speed rotor core (4) and an outer stator core (1), wherein the high-speed rotor core (6), the low-speed rotor core (4) and the outer stator core (1) are arranged inside and outside, a bearing (5) is arranged between the high-speed rotor core (6) and the low-speed rotor core (4), a low-speed rotor permanent magnet (3) is arranged on the outer side of the low-speed rotor core (4), an outer stator permanent magnet (2) is arranged on the inner side of the outer stator core (1), and a non-uniform air gap is; and the low-speed rotor permanent magnet (3) and the outer stator permanent magnet (2) adopt a Halbach array magnetizing mode.
2. The Halbach array eccentric magnetic gear of claim 1, wherein: the outer stator core (1) is formed by laminating silicon steel sheets.
3. The Halbach array eccentric magnetic gear of claim 1, wherein: the outer stator permanent magnet (2) is composed of 64 independent radial polarized permanent magnets which are uniformly distributed along the circumferential direction, a tangential polarized permanent magnet is arranged between two adjacent radial polarized permanent magnets, and the number of pole pairs of a Halbach array composed of 64 permanent magnets is 2.
4. The Halbach array eccentric magnetic gear of claim 1, wherein: the permanent magnet under each pole of low-speed rotor permanent magnet (3) divide into 3 fritters, and the permanent magnet under each pole of outer stator permanent magnet (2) divides into 2 fritters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920761584.2U CN209787020U (en) | 2019-05-24 | 2019-05-24 | Halbach array eccentric magnetic gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920761584.2U CN209787020U (en) | 2019-05-24 | 2019-05-24 | Halbach array eccentric magnetic gear |
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| CN209787020U true CN209787020U (en) | 2019-12-13 |
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| CN201920761584.2U Expired - Fee Related CN209787020U (en) | 2019-05-24 | 2019-05-24 | Halbach array eccentric magnetic gear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034659A (en) * | 2019-05-24 | 2019-07-19 | 三峡大学 | A kind of Halbach array bias magnetic-gear |
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2019
- 2019-05-24 CN CN201920761584.2U patent/CN209787020U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034659A (en) * | 2019-05-24 | 2019-07-19 | 三峡大学 | A kind of Halbach array bias magnetic-gear |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191213 Termination date: 20200524 |