CN104953784A - Double-rotor type low-speed cylindrical permanent magnet linear generator - Google Patents
Double-rotor type low-speed cylindrical permanent magnet linear generator Download PDFInfo
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- CN104953784A CN104953784A CN201510359155.9A CN201510359155A CN104953784A CN 104953784 A CN104953784 A CN 104953784A CN 201510359155 A CN201510359155 A CN 201510359155A CN 104953784 A CN104953784 A CN 104953784A
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- mover
- permanent magnet
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- magnet ring
- stator
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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 double-rotor type low-speed cylindrical permanent magnet linear generator and aims to solve the technical problems that an existing permanent magnet linear motor for direct drive type wave power generation has larger inner magnetic resistance during low-speed running, the magnetic flux density of air gaps in the motor is lower, the output energy efficiency is low and the power quality is low. With the adoption of the technical scheme, the linear generator comprises a stator structure, an inner rotor structure and an outer rotor structure, wherein the stator structure is located in the outer rotor structure, and the inner rotor structure is located in the stator structure; the stator structure comprises a stator winding and a support ring used for supporting the stator winding; the inner rotor structure comprises a hollow inner rotor iron core, an inner rotor permanent magnet ring assembly and an inner rotor shaft; the outer rotor structure comprises a hollow outer rotor iron core, an outer rotor permanent magnet ring assembly and a hollow outer rotor shaft. The motor has small magnetic resistance, lower jitter and high magnetic energy density and efficiency, is low in cost and can be used for direct drive type wave power generation device or a power generation device driven by linear motion.
Description
Technical field
The present invention relates to a kind of linear electric generator, particularly the two mover permanent magnet linear generator of a kind of low speed tubular.
Background technology
Had the linear electric motors of various new structure to be applied in wave-power device at present, first these linear electric motors need and directly drive wave-power device and match and design, and volume comparatively greatly, and power density is low, and the higher harmonic content existed in output electric energy is higher.Secondly, there is larger reluctance force between the elementary iron core of permanent-magnetism linear motor and secondary permanent magnet, affect the stationarity of motor movement.Finally, the Wave energy density in China marine site is low, velocity of wave is lower and irregular, requires higher to the low-speed characteristic of wave power generation linear electric motors.
Summary of the invention
Technical problem to be solved by this invention is, for existing direct-drive type wave power generation permanent-magnetism linear motor when low cruise in motor reluctance force comparatively large, in motor, air gap flux density is low, exports electric energy efficiency low, the problem that the quality of power supply is not high.
Design philosophy of the present invention is, the permanent-magnetic clamp in adopting on rotor permanent magnet ring assemblies is identical with permanent-magnetic clamp radial magnetizing direction corresponding on outer rotor permanent magnet ring assemblies, the structure that axial charging direction is contrary; This design feature can effectively improve motor gas-gap radial magnetic flux density, reduces motor gas-gap axial flux density simultaneously, namely effectively can improve and export the quality of power supply and generating efficiency, reduces motor axial suction simultaneously.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is:
The two mover permanent magnet linear generator of a kind of low speed tubular, comprises stator structure, interior Structure of mover and outer Structure of mover; Stator structure is positioned at outer Structure of mover, and interior Structure of mover is positioned at stator structure; Leave outer air gap between outer Structure of mover and stator structure, between interior Structure of mover and stator structure, leave interior air gap; Outer width of air gap is greater than interior width of air gap, and outer width of air gap scope: 3mm ~ 6mm, interior width of air gap scope: 2mm ~ 5mm;
Stator structure comprises stator winding and the support ring for support stator winding;
Interior Structure of mover comprises mover iron core in hollow, interior rotor permanent magnet ring assemblies and interior mover axle; Interior rotor permanent magnet ring assemblies adopts surface-mount type structure to be affixed on the external peripheral surface of interior mover iron core; Interior mover axle is positioned at hollow mover iron core, and fits tightly between the two;
Outer Structure of mover comprises the outer mover axle of hollow outer mover iron core, outer rotor permanent magnet ring assemblies and hollow; The outer mover iron core of hollow is positioned at the outer mover axle of hollow, and fits tightly between the two; Outer rotor permanent magnet ring assemblies adopts surface-mount type structure to be affixed on the hollow cavity wall of the outer mover iron core of hollow;
Wherein, interior rotor permanent magnet ring assemblies and outer rotor permanent magnet ring assemblies include the radial magnetizing permanent magnetism body ring of at least two and the axial charging permanent magnet ring of at least two, radial magnetizing permanent magnetism body ring and axial charging permanent magnet ring staggered; The equal one_to_one corresponding of permanent-magnetic clamp in interior rotor permanent magnet ring assemblies and outer rotor permanent magnet ring assemblies is arranged; Permanent-magnetic clamp on interior rotor permanent magnet ring assemblies is identical with permanent-magnetic clamp radial magnetizing direction corresponding on outer rotor permanent magnet ring assemblies, and axial charging direction is contrary.
Outer mover iron core in motor of the present invention and interior mover iron core adopt silicon steel sheet to build up, and interior mover axle and outer mover axle all adopt non-permeable material.Outer mover iron core and interior mover iron core adopt silicon steel sheet to build up, and can reach the advantage reducing eddy current loss; Interior mover axle and outer mover axle adopt non-permeable material, can reduce reluctance force in motor, simplify mounting process, strengthen motor steadiness.
To the improvement of technique scheme, support ring adopts epoxy resin to make.The iron-core-free structure that stator structure in the present invention adopts, decreases the axial force between the interior mover of motor and stator, decreases the axial force between the outer mover of motor and stator.Adopt the supporting ring structure made of epoxy resin to be used for support stator winding simultaneously, the two reluctance force between Structure of mover and stator structure of motor can be lowered.
To the further improvement of technique scheme, stator winding is pie concentratred winding.The pie concentratred winding coil that the present invention adopts, winding utilization is high, and the electromotive force amplitude of generation is large.
To the further improvement of technique scheme, interior Structure of mover, outer Structure of mover and stator structure are cylindrical structure.Structure of mover in the present invention and stator structure all adopt cylindrical structure, object is because interior Structure of mover, outer Structure of mover and stator structure all adopt cylindrical structure, radial forces between the interior mover of this generator and stator is cancelled out each other, and the radial forces between outer mover and stator is cancelled out each other.In addition, the cartridge type project organization of this generator also reduces the jitter phenomenon of appearance when moving such as other generic linear motors such as flat grade, adds steadiness and the efficiency of motor; So this motor resistance when start-up and functionning is little, power consumption is few, and energy conversion rate is high.
To the further improvement of technique scheme, for improving the air gap flux density of motor in the present invention, improve motor electric energy delivery efficiency; Interior rotor permanent magnet ring assemblies and outer rotor permanent magnet ring assemblies include the radial magnetizing permanent magnetism ring of at least two and the axial magnetizing permanent magnetism ring of at least two, and radial magnetizing permanent magnetism ring and axial magnetizing permanent magnetism ring staggered.
When the interior Structure of mover of motor of the present invention and outer Structure of mover do reciprocating linear motion, the magnetic field that interior mover and outer rotor permanent magnet ring structure produce will produce magnetic linkage in the stator windings, formed the unloaded induced electromotive force of generator by the change of magnetic linkage, the relation of permanent magnet flux linkage and induced electromotive force is such as formula the statement of (1) and formula (2).
e＝-dψ/dt＝-ndΦ/dt (1)
Φ＝∫B
r(z)dS＝πD∫B
r(z)dz (2)
In formula (1) and (2), B
rz () is air gap flux density radial values, ψ, Φ are winding magnetic linkage and magnetic flux respectively, and n represents umber of turn, and D is outer mover external diameter.
Therefore, this motor adopts two mover bilateral hybrid directional charging permanent magnet ring structure, improves motor gas-gap magnetic flux density radial component B
rz (), improves winding magnetic linkage variable quantity, namely improves the output voltage amplitude of generator under low cruise when motor low cruise, solve the technical problem that motor electric energy delivery efficiency is low.
Due to the existence of magnet ring and core structure, permanent-magnetism linear motor inside produces the reluctance force of mechanical periodicity, makes motor produce shake when start-up and operation, energy consumption increase.By Maxwell stress tensor method, the variation relation of magnetic resistance of motor power and air gap flux density is such as formula the statement of (3):
In formula (3), B
nfor the close normal component of motor gas-gap magnetic, B
tfor the close tangential component of motor gas-gap magnetic.
Therefore, motor adopts described pair of mover bilateral hybrid directional charging permanent magnet ring structure, weaken air gap flux density axial component (i.e. normal component), strengthen air gap flux density radial component (i.e. tangential component), reduce magnetic resistance of motor power, solution motor internal resistance is large, jitter phenomenon, improves the energy conversion efficiency of generator and run steadiness under motor low cruise.
As another kind of improvement project of the present invention, according to the principle of reversibility of motor, this motor adopts double-stator structure, comprises internal stator structure and outer stator structure, installs magnet ring assembly outside internal stator, inside external stator; Electric mover adopts iron-free core type structure, and adopts cake formula concentratred winding.
The present invention's advantage compared with prior art:
1, this motor adopts two mover bilateral to mix the structure that magnetizes, and improves motor gas-gap radial magnetic flux density, namely improve generator output voltage amplitude when motor low cruise, solves the technical problem that motor electric energy delivery efficiency is low.
2, the two Structure of mover of this motor and stator structure all adopt cylinder type, and the radial forces between the interior mover of motor and stator is cancelled out each other, and the radial forces between outer mover and stator is cancelled out each other; This structure can reduce reluctance force fluctuation amplitude in motor, strengthens motor steadiness, reduces the loss of electric machine.
3, relative in this motor interior rotor permanent magnet ring is identical with outer rotor permanent magnet ring radial magnetizing direction, and relative interior rotor permanent magnet ring is contrary to magnetizing direction with outer rotor permanent magnet annulate shaft.This design feature can effectively improve motor gas-gap radial magnetic flux density, reduces motor gas-gap axial flux density simultaneously, namely effectively can improve and export the quality of power supply and generating efficiency, reduces motor axial suction simultaneously.
4, this magnetic resistance of motor power little, shake little, magnetic energy density is high, efficiency is high, cost is low, can be used for Direct driver wave-energy power generation or adopt rectilinear motion drive Blast Furnace Top Gas Recovery Turbine Unit (TRT) in.
Accompanying drawing explanation
Fig. 1 is the three-dimensional structure schematic diagram of the present embodiment motor.
Fig. 2 is the two-dimensional structure schematic diagram of the present embodiment motor.
Fig. 3 is the magnetic line of force schematic diagram of the two mover bilateral magnet ring assembly of the present embodiment motor.
Fig. 4 is the two mover bilateral magnet ring magnetic line of force distribution map of the present embodiment motor.
Fig. 5 is the close harmonic content of embodiment motor gas-gap magnetic.
Wherein, 1, the outer mover axle of hollow, 2, the outer mover iron core of hollow, 3, outer rotor permanent magnet ring assemblies, 4, interior mover axle, 5, mover iron core in hollow, 6, interior rotor permanent magnet ring assemblies, 7, support ring, 8, stator winding.
Embodiment
For making content of the present invention more become apparent, be further described below in conjunction with accompanying drawing 1-Fig. 5 and embodiment.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment:
Fig. 1 is the stereogram of the present embodiment generator, and as shown in Figure 1, the two mover permanent magnet linear generator of low speed tubular of the present embodiment, comprises stator structure, interior Structure of mover and outer Structure of mover; Stator structure is positioned at outer Structure of mover, and interior Structure of mover is positioned at stator structure; The preferred outer air gap 3mm left between outer Structure of mover and stator structure, the preferably interior air gap 2mm left between interior Structure of mover and stator structure;
As shown in Figure 1, the interior Structure of mover in the present embodiment, outer Structure of mover and stator structure are cylindrical structure, and the radial forces between the interior mover of this generator and stator is cancelled out each other, and the radial forces between outer mover and stator is cancelled out each other.In addition, the cartridge type project organization of this generator also reduces the jitter phenomenon of appearance when moving such as other generic linear motors such as flat grade, adds steadiness and the efficiency of motor; So this motor resistance when start-up and functionning is little, power consumption is few, and energy conversion rate is high.
Outer mover iron core in the present embodiment motor and interior mover iron core adopt silicon steel sheet to build up, and interior mover axle and outer mover axle all adopt non-permeable material.Outer mover iron core and interior mover iron core adopt silicon steel sheet to build up, and can reach the advantage reducing eddy current loss; Interior mover axle and outer mover axle adopt non-permeable material, can reduce reluctance force in motor, simplify mounting process, strengthen motor steadiness.
What the generator stator structure in the present embodiment adopted is iron-core-free structure; Support ring 7 structure made of epoxy resin is adopted to be used for support stator winding 8.Stator winding 8 adopts cake formula concentratred winding.
Interior Structure of mover in the present embodiment comprises mover iron core 5 in hollow, interior rotor permanent magnet ring assemblies 6 and interior mover axle 4; Interior rotor permanent magnet ring assemblies 6 adopts surface-mount type structure to be affixed on the external peripheral surface of interior mover iron core 5; Interior mover axle 4 is positioned at hollow mover iron core 5, and fits tightly between the two.Outer Structure of mover comprises the outer mover axle 1 of hollow outer mover iron core 2, outer rotor permanent magnet ring assemblies 3 and hollow; The outer mover iron core 2 of hollow is positioned at the outer mover axle 1 of hollow, and fits tightly between the two; Outer rotor permanent magnet ring assemblies 3 adopts surface-mount type structure to be affixed on the hollow cavity wall of the outer mover iron core 2 of hollow.Interior rotor permanent magnet ring assemblies 6 and outer rotor permanent magnet ring assemblies 3 include the radial magnetizing permanent magnetism body ring of four and the axial charging permanent magnet ring of four, radial magnetizing permanent magnetism body ring and axial charging permanent magnet ring staggered, and the equal one_to_one corresponding of permanent-magnetic clamp in interior rotor permanent magnet ring assemblies 6 and outer rotor permanent magnet ring assemblies 3 is arranged.Permanent-magnetic clamp on interior rotor permanent magnet ring assemblies 6 is identical with permanent-magnetic clamp radial magnetizing direction corresponding on outer rotor permanent magnet ring assemblies 3, and axial charging direction is contrary.As shown in Figure 2.
As shown in Figure 3, interior rotor permanent magnet ring structure 6 is placed on outside interior mover iron core 5, and outer rotor permanent magnet ring structure 3 is placed on inside outer mover iron core 2.Permanent-magnetic clamp on interior rotor permanent magnet ring assemblies 6 is identical with permanent-magnetic clamp radial magnetizing direction corresponding on outer rotor permanent magnet ring assemblies 3, and axial charging direction is contrary.Two mover bilateral hybrid directional charging permanent magnet ring structure, weaken air gap flux density axial component (i.e. normal component), strengthen air gap flux density radial component (i.e. tangential component), reduce magnetic resistance of motor power, solution motor internal resistance is large, jitter phenomenon, improves the energy conversion efficiency of generator and run steadiness under motor low cruise.
Be illustrated in figure 4 and adopt limited element analysis technique to carry out numerical computations to the magnetic line of force distribution situation that two mover bilateral magnet ring produces, demonstrate analysis result as shown in Figure 3.
Fourier analysis is carried out to the air gap flux density distribution curve between the two mover of motor, draws the harmonic content of air gap flux density as shown in Figure 5.Known, adopt two mover bilateral magnet ring structure effectively can reduce the higher harmonic content of air gap density, improve motor and export the quality of power supply.
Part that the present invention does not relate to is all same as the prior art or adopt prior art to be realized.
Described in the present invention, concrete case study on implementation is only better case study on implementation of the present invention, is not used for limiting practical range of the present invention.Namely all equivalences done according to the content of the present patent application the scope of the claims change and modify, all should as technology category of the present invention.
Claims (4)
1. the two mover permanent magnet linear generator of low speed tubular, is characterized in that, comprise stator structure, interior Structure of mover and outer Structure of mover; Stator structure is positioned at outer Structure of mover, and interior Structure of mover is positioned at stator structure; Leave outer air gap between outer Structure of mover and stator structure, between interior Structure of mover and stator structure, leave interior air gap; Outer width of air gap is greater than interior width of air gap, and outer width of air gap scope: 3mm ~ 6mm, interior width of air gap scope: 2mm ~ 5mm;
Stator structure comprises stator winding (8) and the support ring (7) for support stator winding (8);
Interior Structure of mover comprises mover iron core (5) in hollow, interior rotor permanent magnet ring assemblies (6) and interior mover axle (4); Interior rotor permanent magnet ring assemblies (6) adopts surface-mount type structure to be affixed on the external peripheral surface of interior mover iron core (5); Interior mover axle (4) is positioned at hollow mover iron core (5), and fits tightly between the two;
Outer Structure of mover comprises the outer mover axle (1) of hollow outer mover iron core (2), outer rotor permanent magnet ring assemblies (3) and hollow; The outer mover iron core (2) of hollow is positioned at the outer mover axle (1) of hollow, and fits tightly between the two; Outer rotor permanent magnet ring assemblies (3) adopts surface-mount type structure to be affixed on the hollow cavity wall of the outer mover iron core (2) of hollow;
Wherein, interior rotor permanent magnet ring assemblies (6) and outer rotor permanent magnet ring assemblies (3) include the radial magnetizing permanent magnetism body ring of at least two and the axial charging permanent magnet ring of at least two, radial magnetizing permanent magnetism body ring and axial charging permanent magnet ring staggered; The equal one_to_one corresponding of permanent-magnetic clamp in interior rotor permanent magnet ring assemblies (6) and outer rotor permanent magnet ring assemblies (3) is arranged; Permanent-magnetic clamp on interior rotor permanent magnet ring assemblies (6) is identical with the upper corresponding permanent-magnetic clamp radial magnetizing direction of outer rotor permanent magnet ring assemblies (3), and axial charging direction is contrary.
2. the two mover permanent magnet linear generator of low speed tubular as claimed in claim 1, is characterized in that, support ring (7) adopts epoxy resin to make.
3. the two mover permanent magnet linear generator of low speed tubular as claimed in claim 1, it is characterized in that, stator winding (8) is pie concentratred winding.
4. the two mover permanent magnet linear generator of low speed tubular as claimed in claim 1, it is characterized in that, interior Structure of mover, outer Structure of mover and stator structure are cylindrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510359155.9A CN104953784A (en) | 2015-06-25 | 2015-06-25 | Double-rotor type low-speed cylindrical permanent magnet linear generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510359155.9A CN104953784A (en) | 2015-06-25 | 2015-06-25 | Double-rotor type low-speed cylindrical permanent magnet linear generator |
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| CN104953784A true CN104953784A (en) | 2015-09-30 |
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| CN201510359155.9A Pending CN104953784A (en) | 2015-06-25 | 2015-06-25 | Double-rotor type low-speed cylindrical permanent magnet linear generator |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0992498A (en) * | 1995-09-26 | 1997-04-04 | Shin Etsu Chem Co Ltd | Magnetic circuit for inserted light source device |
| CN201549978U (en) * | 2009-08-19 | 2010-08-11 | 东南大学 | Linear generator with magnetic gear for wave power generation |
| CN102265490A (en) * | 2008-12-25 | 2011-11-30 | 株式会社东芝 | Linear motor |
| CN103368284A (en) * | 2012-03-30 | 2013-10-23 | 仁维国际股份有限公司 | Electromagnetic induction device |
| CN204741395U (en) * | 2015-06-25 | 2015-11-04 | 金陵科技学院 | Sub - permanent magnetism linear generator of low -speed cylindric double acting |
-
2015
- 2015-06-25 CN CN201510359155.9A patent/CN104953784A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0992498A (en) * | 1995-09-26 | 1997-04-04 | Shin Etsu Chem Co Ltd | Magnetic circuit for inserted light source device |
| CN102265490A (en) * | 2008-12-25 | 2011-11-30 | 株式会社东芝 | Linear motor |
| CN201549978U (en) * | 2009-08-19 | 2010-08-11 | 东南大学 | Linear generator with magnetic gear for wave power generation |
| CN103368284A (en) * | 2012-03-30 | 2013-10-23 | 仁维国际股份有限公司 | Electromagnetic induction device |
| CN204741395U (en) * | 2015-06-25 | 2015-11-04 | 金陵科技学院 | Sub - permanent magnetism linear generator of low -speed cylindric double acting |
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Application publication date: 20150930 |