CN102570667B

CN102570667B - Elliptic polarized double-layer rotor magnetic sheet

Info

Publication number: CN102570667B
Application number: CN201210029579.5A
Authority: CN
Inventors: 曹江; 许军
Original assignee: NINGBO WEIYING ENERGY TECHNOLOGY Co Ltd
Current assignee: NINGBO WEIYING ENERGY TECHNOLOGY Co Ltd
Priority date: 2008-04-28
Filing date: 2008-04-28
Publication date: 2014-01-08
Anticipated expiration: 2028-04-28
Also published as: CN102570667A

Abstract

The invention relates to a double-layer rotor magnetic sheet of a wind-driven generator, in particular to an interval structure of a magnetic sheet on a double-layer rotor of the wind-driven generator. According to the interval structure of the magnetic sheet on the double-layer rotor of the wind-driven generator, distance distribution relation of an inner magnetic sheet and an outer magnetic sheet of a rotor on a power generator is improved, so that strength distribution of a magnetic field on motion rail of a coil is optimized, thereby obtaining current output closer to a sine curve. The interval structure of the magnetic sheet on the double-layer rotor of the wind-driven generator has the characteristics that the double-layer rotor of the wind-driven generator comprises outer layers of magnetic sheets and inner layers of the magnetic sheets which have the same numbers, match in pairs and are annularly and uniformly distributed around a shaft of the power generator, radial intervals between the outer layers of the magnetic sheets and the inner layers of the magnetic sheets matched in pairs are minimum at the middle parts and are larger when being closer at two sides of the outer layers of the magnetic sheets and the inner layers of the magnetic sheets. Opposite side lines of the magnetic sheets matched in pairs are subjected to an elliptic polarization deformation treatment. Therefore, the strength of the magnetic field close to the center of each magnetic sheet is enhanced, and the strength of the magnetic field from the center of each magnetic sheet to the two sides of each magnetic sheet is of remarkable gradient change.

Description

The two-level rotor magnetic sheet of oval polarization

Technical field

The present invention relates to a kind of two-level rotor magnetic sheet of wind-driven generator, particularly the pitch structure of the magnetic sheet on the two-level rotor of wind-driven generator.

Background technology

Traditional wind-driven generator consists of a group rotor and one group of stator usually, and rotor rotates under the drive of wind-force, the coil cutting magnetic line generation current.A kind of double-layer rotor aerogenerator that we propose can effectively improve the magnetic flux by coil, thereby improves the efficiency of generator.But the distance relation of the shape of inside and outside one group of magnetic sheet relatively and mutual diverse location is on the direct impact of being distributed with of magnetic field intensity, and this also just has influence on the magnetic field distribution situation of coil on the cutting magnetic line movement track.

Summary of the invention

The present invention is by the range distribution relation between inside and outside two-layer magnetic sheet on the rotor that improves generator, and then the magnetic field distribution on optimization coil movement track, thereby obtains closer to sinusoidal electric current output.Feature of the present invention is: the radial distance inside and outside every pair on the two-level rotor of wind-driven generator between magnetic sheet is larger in the position the closer to the magnetic sheet both sides.

What Fig. 1 and Fig. 2 showed is exactly the internal mechanism of double-layer rotor aerogenerator; Fig. 3 has shown the magnetic field situation between the magnetic sheet on this two-level rotor, can see that the magnetic sheet center does not form desirable gradient to the variation of the magnetic field intensity on both sides.This is that Fig. 4 has just shown this situation because the center of every pair of magnetic sheet is not until the radial spacing on both sides has difference to cause, and wherein, between outer magnetic sheet 20 and internal layer magnetic sheet 40, each position exists lower relation of plane with respect to the radial spacing centered by arbor 5

d ₀＝d ₁＝d ₂

Fig. 5 has shown improvement project proposed by the invention, and wherein, between outer magnetic sheet 20 and internal layer magnetic sheet 40, each position exists lower relation of plane with respect to the radial spacing centered by arbor 5

d0≤d1≤d2，d0＜d2

Fig. 6 has shown the magnetic field distribution situation after improving.Annular broken in figure represents the relative movement orbit of coil.Comparison diagram 3, can see the density of the magnetic line of force, the intensity in magnetic field namely, obvious graded is arranged on the relative movement orbit along coil: the magnetic field intensity near the magnetic sheet center has obtained reinforcement, the relative movement orbit of the little flux loop off-line circle of the edge of two adjacent outer magnetic sheets is farther, and the little flux loop of the edge of two adjacent internal layer magnetic sheets is also like this.

Fig. 7 has shown the internal structure of the generator after the magnetic sheet spacing is improved.

Make the spacing difference of each position between magnetic sheet that many implementation methods be arranged.Introduced respectively the scheme that adopts circular arc, planar shaped and ellipsoid to be combined in the embodiment of back.

Further optimize and need to describe by curvilinear function the cross-sectional shape of magnetic sheet.

Curve L in the plane coordinate system (x, y) of the first half of Fig. 8 is half of the oval major axis V left side, and the coordinate of the some P on L is (a, b).

When coil is done the straight line relative motion, the curve L here is exactly a kind of cross-sectional shape of desirable magnetic sheet.But coil is actually does the circumference relative motion.So, need to do the polarization deformation process to curve L.The distortion of the polarization here, be that to take the arbor center of generator be round dot, the oval long wheelbase of the take distortion that the distance at axle center is radius of disembarking.The latter half of Fig. 8 has shown the situation after the distortion, center of circle O is the arbor center, oval major axis V is deformed into circular arc V ', curve L is deformed into L ', and the some P (a, b) on L corresponds to some the P ' (a in polar coordinate system, ω), the a here is the distance of a P ' to some O, and it equates with a in some P (a, b); ω is angle, meets following relational expression

ω＝b/a

Curve L ' is exactly the interior curved Optimal Curve after distortion, when actual processing and fabricating magnetic sheet, might not need to adopt complete curve L ', can only adopt the part of curve L ', and centered by the z axle, left-right symmetric is just passable.

Fig. 9 shown oval major axis V the right half carry out the corresponding situation before and after same polarization distortion.Curve L in plane coordinate system (x, y) is deformed into the L ' in polar coordinate system, and some P (a, b) corresponds to a P ' (a, ω), and their coordinate figure still meets relational expression

ω＝b/a

For concrete outer magnetic sheet, the sideline towards the internal layer magnetic sheet of its radial section is exactly the curve L ' in Fig. 8, or its part; And, for the internal layer magnetic sheet, the sideline towards outer magnetic sheet of its radial section is exactly the curve L ' in Fig. 9, or its part.Here said part both sides symmetry centered by axle z.

The accompanying drawing explanation

Fig. 1 is the internal structure schematic diagram of double-layer rotor aerogenerator.

Fig. 2 be along A-A to cutaway view.

Fig. 3 is the magnetic field magnetic line distribution schematic diagram of two-level rotor.

Fig. 4 is ectonexine magnetic sheet spacing schematic diagram.

Fig. 5 is the inconsistent situation schematic diagram of the spacing of ectonexine magnetic sheet.

Fig. 6 is the magnetic field distribution situation schematic diagram between the ectonexine magnetic sheet on the coil relative movement orbit.

Fig. 7 adopts the not generator part-structure schematic diagram of equidistant ectonexine magnetic sheet.

Fig. 8 is that curve L makees interior curved polarization distortion schematic diagram.

Fig. 9 is that curve L makees excurvation polarization distortion schematic diagram.

Figure 10, Figure 11 and Figure 12 are three kinds of embodiment.

In figure: 1. rotor; 12. rotor outer layer; 14. rotor inner layer; 20. outer magnetic sheet; 40. internal layer magnetic sheet; 3. stator; 30. coil; 5. arbor; 11. the projection on rotor outer layer.

Symbol implication in figure is: d ₀, d ₁, d ₂radial spacing for diverse location between the ectonexine magnetic sheet; P (a, b) is any point on the curve L in plane coordinate system (x, y); P ' (a, ω) is the point on the curve L ' in polar coordinate system, and it exists with some P the corresponding relation polarized before and after being out of shape.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.

Figure 10 has shown a kind of execution mode, and the inner surface of its ectomesoderm magnetic sheet 20 is planes, and as the radial section schematic diagram, what show in the drawings is straight line; And the outer surface of internal layer magnetic sheet 40 is curved surfaces, what show in the drawings is a curve, and this curve is to take the circular arc that the center of arbor 5 is the center of circle.

Figure 11 is the further improvement on the basis of Figure 10.Do little circular arc at the two ends of the outer surface of internal layer magnetic sheet 40 and processed, made the relative movement orbit of two Edge Distance coils more farther.

Figure 12 is another execution mode.The inner surface of outer magnetic sheet 20 is curved surfaces, and what show in the drawings is a curve, and this curve is to take the circular arc that the center of arbor 5 is the center of circle; And the outer surface of internal layer magnetic sheet 40 is also a curved surface, what show in the drawings is another curve, and this curve is not to take the circular arc that the center of arbor 5 is the center of circle, and it is the part of an oval circular arc.

By adjusting oval axial length and eccentricity, can adjust the spacing of each position between two magnetic sheets.

As preferred scheme, the length of the major axis of two ellipses at ectonexine magnetic sheet place is directly proportional to the distance of generator arbor axis separately to them.

As preferred scheme, the eccentricity of above-mentioned two ellipses is identical.

Claims

1. the two-level rotor magnetic sheet of an oval polarization, comprise same number of outer magnetic sheet (20) and internal layer magnetic sheet (40), they mate in pairs, around the arbor (5) of generator is belt, are uniformly distributed, their radial spacing is in the middle part minimum, larger the closer to both sides; The sideline towards the internal layer magnetic sheet of the radial section of described outer magnetic sheet (20) is the part after oval polarization distortion, and the sideline towards outer magnetic sheet of the radial section of described internal layer magnetic sheet (40) is the part after another oval polarization distortion; It is characterized in that: the length of the major axis of these two ellipses is directly proportional to the distance of generator arbor axis separately to them.

2. the two-level rotor magnetic sheet that ellipse according to claim 1 polarizes, it is characterized in that: the eccentricity of described two ellipses is identical.