CN104883031A - Cylindrical-type linear magnetic gear - Google Patents
Cylindrical-type linear magnetic gear Download PDFInfo
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- CN104883031A CN104883031A CN201510328018.9A CN201510328018A CN104883031A CN 104883031 A CN104883031 A CN 104883031A CN 201510328018 A CN201510328018 A CN 201510328018A CN 104883031 A CN104883031 A CN 104883031A
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Abstract
The invention discloses a cylindrical-type linear magnetic gear, and aims at effectively inhibiting the thrust ripple in a conventional magnetic-field modulation linear-type magnetic gear design, thereby improving the dynamic stability of the magnetic gear. The gear comprises three annular bodies in three layers forming a two-gap structure, i.e., an inner magnetic ring (9), an outer magnetic ring (7) and a magnetic adjustment ring (8) made of high magnetic conduction materials and non-magnetic-conduction materials, wherein the magnetic adjustment ring (8) is located between the inner magnetic ring (9) and the outer magnetic ring (7). The inner magnetic ring (9) and an inner back yoke (10) form a low-speed rotor (11), and the outer magnetic ring (7) and an outer back yoke (5) form a high-speed rotor (4), wherein the high-speed rotor (4) is provided with a damping winding (6) with a closed loop.
Description
Technical field
The invention belongs to non-contact type mechanical drive technology field, be specifically related to a kind of magnetic field modulation drum type brake straight line magnetic-gear with damping winding.
Background technology
Magnetic-gear is a kind of novel magnetic drives machinery, relies on magnetic Field Coupling effect transferring power.Owing to there is not the meshing relation of traditional mechanical gear, can lubricated maintenance be avoided, there is higher transmission efficiency and overload self-shield ability.In addition, magnetic-gear does not need fine finishining and the heat treatment of mechanical gear, greatly simplifies processing technology.Meanwhile, constrained input two mechanical ports of magnetic-gear directly do not contact, and make it in the fluid pump class such as poisonous, harmful drives, have special advantage, have become domestic and international study hotspot.The magnetic-field modulation-type magnetic-gear patent (US7973441B2 that medium people applies for is built in Britain Kais.Atallah, Chinese river; GB2439111A; 201010118737.5), there is force density high, the features such as mechanical loss is low.In recent years, the power transmission system application with straight-line trajectory is increasingly extensive, and the people such as Univ Sheffield UK J.Wang, Hong Kong University K.T.Chau have delivered the achievement in research about straight line magnetic-gear on the internal authority periodicals such as IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY and IEEE TRANSACTIONS ON MAGNETICS.Straight line magnetic-gear, because eliminating intermediate conversion mechanism rotary motion being converted to rectilinear motion, reduces device volume, saves system cost, improve transmission efficiency, therefore have broad application prospects.But existing straight line magnetic-gear design, realizes transmission of power mainly through harmonic field, force oscillation and vibration noise problem can not be ignored, especially in load disturbance process, affect the dynamic stability of whole power transmission system, thus limit applying of magnetic-gear.
Summary of the invention
Force oscillation in the object of the invention is effectively to suppress existing magnetic field modulation orthoscopic magnetic-gear to design, thus improve the dynamic stability of magnetic-gear.
The present invention is drum type brake straight line magnetic-gear, and this gear comprises shellring shape body, and in two gap structure, i.e. internal magnetic ring 9, outer magnetic ring 7 and an adjustable magnetic ring 8 be made up of high permeability material and non-magnet material, adjustable magnetic ring 8 is between interior outer magnetic ring; Internal magnetic ring 9 and inner back yoke 10 form low speed mover 11, and outer magnetic ring 7 and outside back yoke 5 form high speed mover 4, and high speed mover 4 are arranged the damping winding 6 with closed-loop path.
The present invention compared with the prior art comparatively, there is following significant innovative characteristics: damping winding is arranged in the high speed mover side of drum type brake straight line magnetic-gear of the present invention, interior outer magnetic ring all adopts Halbach array to magnetize structure, and the number of magnetic poles of high speed mover is followed " least common multiple principle " with the selection of the block number unshakable in one's determination of the adjustable magnetic ring with magneto resistance effect, namely the number of magnetic poles of high speed mover should be the bigger the better with the minimum multiple Nc=2*P1*Ns altogether of the block number unshakable in one's determination of the adjustable magnetic ring with magneto resistance effect.Meanwhile, the structure of internal magnetic ring and outer magnetic ring is more flexible, can adopt permanent magnet excitation or electric excitation two schemes.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention; Fig. 2 is mover, the stator shaft orientation profile of Fig. 1; Fig. 3 is the A-A profile of Fig. 2; Fig. 4 is that the permanent magnet Halbach array of Fig. 1 low speed mover and high speed mover magnetizes schematic diagram; Fig. 5 is the three-dimensional structure schematic diagram of Fig. 2; Fig. 6 is the structural representation of second embodiment of the invention; Fig. 7 is the three-dimensional structure schematic diagram of second embodiment of the invention; Fig. 8 is the structural representation of third embodiment of the invention; Fig. 9 is the three-dimensional structure schematic diagram of third embodiment of the invention; Reference numeral and corresponding name are called: motor center axle 1, end cap 2, support 3, high speed mover 4, outside back yoke 5, damping winding 6, outer magnetic ring 7, adjustable magnetic ring 8, internal magnetic ring 9, inner back yoke 10, low speed mover 11, internal layer air gap 12, outer air gap 13, slow-speed shaft 14, high speed shaft 15, stator core 16, stator non-magnetizer 17, outer core 18, outside winding 19, inner core 20, inner winding 21.
Embodiment
As shown in Figure 1, the present invention is drum type brake straight line magnetic-gear, and this gear comprises shellring shape body, and in two gap structure, i.e. internal magnetic ring 9, outer magnetic ring 7 and an adjustable magnetic ring 8 be made up of high permeability material and non-magnet material, adjustable magnetic ring 8 is between interior outer magnetic ring; Internal magnetic ring 9 and inner back yoke 10 form low speed mover 11, and outer magnetic ring 7 and outside back yoke 5 form high speed mover 4, and high speed mover 4 are arranged the damping winding 6 with closed-loop path.
As shown in Figure 1, drum type brake straight line magnetic-gear of the present invention, internal magnetic ring is made up of pole permanent magnet P1, and adjacent permanent magnet polarity is contrary; Described outer magnetic ring is made up of pole permanent magnet P2, and adjacent permanent magnet polarity is contrary; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and P1>P2, Ns=P1+P2; Described shellring shape body, wherein any two ring bodies as mover, can remain a ring bodies as stator, and interior outer magnetic ring all adopts accurate Halbach array to magnetize mode.
As shown in Fig. 6, Fig. 7, Fig. 8, Fig. 9, drum type brake straight line magnetic-gear, internal magnetic ring is made up of pole permanent magnet P1, and adjacent permanent magnet polarity is contrary; Described outer magnetic ring is made up of outer core 18 and excitation winding 19, and excitation winding is that P2 is to pole; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and Ns=P1+P2; Described outer magnetic ring is as stator, and internal magnetic ring and adjustable magnetic ring are as mover.
As shown in Figure 8, drum type brake straight line magnetic-gear, internal magnetic ring is made up of inner core 20 and excitation winding 21, and excitation winding is that P1 is to pole; Outer magnetic ring is made up of pole permanent magnet outer core and P2, and adjacent permanent magnet polarity is contrary; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and Ns=P1+P2; Described internal magnetic ring is as stator, and outer magnetic ring and adjustable magnetic ring are as mover.
Described drum type brake straight line magnetic-gear will realize the gearratio of a certain size scope, and multiple number of poles can be had to choose mode, considers from reduction teeth groove thrust, raising transmission efficiency and the many factors such as pushing force density and simplified manufacturing technique.For a certain magnetic-gear no-load voltage ratio determined, the number of magnetic poles of its high speed mover should be the bigger the better with the minimum multiple Nc=2*P1*Ns altogether of the block number unshakable in one's determination of the adjustable magnetic ring with magnetic Field Coupling effect, is referred to as here " least common multiple principle ".Because the fluctuation of straight line magnetic-gear mover magnetic force mainly produces due to cogging force effect, the vibration frequency of cogging force is identical with Nc, when vibration frequency is higher, then fluctuation amplitude is less, so least common multiple principle is designed with the stability helping improve mover electromagnetic force, thus reduce vibration and the noise of magnetic-gear.Relative to high speed mover, the thrust output of low speed mover is large, and the change frequency of its teeth groove thrust is higher, and the amplitude of teeth groove thrust is relatively little, and therefore low speed mover average thrust is less by the impact of teeth groove force oscillation.
Described drum type brake straight line magnetic-gear is compared with traditional mechanical gear, and its rigidity is lower, when load or speed change, magnetic-gear will be caused to produce electromagnetic push fluctuation problem, thus reduce the dynamic stability of whole drive system.As a case study on implementation of the present invention, adjustable magnetic ring is as stator, inside and outside magnet ring is as mover, the output mover of magnetic-gear is introduced the damping winding with closed-loop path, to change or in starting process in load, speed, induced current will be produced in damping winding, this electric current produces the electromagnetic push with damping action under magnetic fields, thus effectively suppress the force oscillation of dynamic process, after magnetic-gear mover speed reaches synchronous speed, this induced current is zero, and magnetic-gear enters steady-working state.Meanwhile, for reducing the damping winding copper loss of magnetic-gear, damping winding resistance is unsuitable excessive.
In the magnet structure of described drum type brake straight line magnetic-gear, permanent magnet shape is rectangle or trapezoidal, and adopt Halbach array to magnetize mode, effectively improve amplitude and the sine degree of air gap flux density, thus the power density of magnetic-gear can be increased, reduce force oscillation, reduce device volume.
Embodiment one:
As shown in Figure 1, axially uniform P1 is to pole permanent magnet for the cylindrical outer of internal magnetic ring 9, and the axial uniform P2 of cylinder interior of outer magnetic ring 7 is to pole permanent magnet, and P1>P2.Outer magnetic ring 7 draws high speed shaft 15 by end cap 2b, and internal magnetic ring 9 draws slow-speed shaft 14 by end cap 2a, and the structural representation of end cap 2a, 2b as shown in Figure 6.Adjustable magnetic ring 8 is stator, stator by axially uniform iron core 16 and non-magnetizer 17(as epoxy resin etc.) form.The magnetic conductance of internal layer air gap 12 and outer air gap 13 that makes spaced apart just because of stator core and stator non-magnetizer produces cyclic variation vertically, thus produces modulating action to inside and outside air-gap field.Fig. 2 is the stator core number Ns=P1+P2 of mover, the stator shaft orientation profile of Fig. 1, adjustable magnetic ring 8, thus makes two mover air-gap fields have identical modulation first-harmonic, realizes the transmission of thrust and speed, and the gearratio of two movers is K=P1/P2.Fig. 3 is A-A place radial section figure in Fig. 2, and this magnetic-gear has circulus feature.The Halbach array that is all as the criterion internal magnetic ring 9 as shown in Figure 4 and the permanent magnet of outer magnetic ring 7 magnetizes mode, to magnetize mode by the accurate Halbach array that radial arrays, oblique array combine with axial array, discrete magnetic patch is stitched together and obtains the effect that near sinusoidal magnetizes.
As shown in Figure 5, outside back yoke 5 is evenly arranged damping winding 6, each cover damping winding has loop of one's own, in the process changed in starting and braking uniform velocity in load generation disturbance or drive system, induced current will be produced in damping winding, this electric current produces the electromagnetic push with damping action under magnetic fields, thus effectively suppresses force oscillation.After magnetic-gear mover speed reaches synchronous speed, this induced current is zero, and magnetic-gear enters steady-working state.
Embodiment two:
Drum type brake straight line magnetic-gear as shown in Figure 6, forms internal magnetic ring 9 by P1 to pole permanent magnet, and internal magnetic ring 9 and inner back yoke 10 are as low speed mover; Described outer magnetic ring is made up of pole excitation winding 19 outer core 18 and P2, and outer magnetic ring is as stator; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and Ns=P1+P2, adjustable magnetic ring is as high speed mover.Fig. 7 is the tomograph of the straight line of drum type brake shown in Fig. 6 magnetic-gear.
Embodiment three:
Drum type brake straight line magnetic-gear as shown in Figure 8, internal magnetic ring is made up of pole excitation winding 21 inner core 20 and P1, and as stator; Outer magnetic ring is made up of pole permanent magnet P2, and as high speed mover; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and Ns=P1+P2, adjustable magnetic ring is as low speed mover.Fig. 9 is the tomograph of the straight line of drum type brake shown in Fig. 8 magnetic-gear.
Claims (4)
1. drum type brake straight line magnetic-gear, it is characterized in that: this gear comprises shellring shape body, in two gap structure, i.e. internal magnetic ring (9), outer magnetic ring (7) and an adjustable magnetic ring (8) be made up of high permeability material and non-magnet material, adjustable magnetic ring (8) is between interior outer magnetic ring; Internal magnetic ring (9) and inner back yoke (10) form low speed mover (11), and outer magnetic ring (7) and outside back yoke (5) form high speed mover (4), and the upper layout of high speed mover (4) has the damping winding (6) of closed-loop path.
2. drum type brake straight line magnetic-gear according to claim 1, it is characterized in that internal magnetic ring is made up of pole permanent magnet P1, and adjacent permanent magnet polarity is contrary; Described outer magnetic ring is made up of pole permanent magnet P2, and adjacent permanent magnet polarity is contrary; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and P1>P2, Ns=P1+P2; Described shellring shape body, wherein any two ring bodies as mover, can remain a ring bodies as stator, and interior outer magnetic ring all adopts accurate Halbach array to magnetize mode.
3. drum type brake straight line magnetic-gear according to claim 1, it is characterized in that internal magnetic ring is made up of pole permanent magnet P1, and adjacent permanent magnet polarity is contrary; Described outer magnetic ring is made up of outer core (18) and excitation winding (19), and excitation winding is that P2 is to pole; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and Ns=P1+P2; Described outer magnetic ring is as stator, and internal magnetic ring and adjustable magnetic ring are as mover.
4. drum type brake straight line magnetic-gear according to claim 1, it is characterized in that internal magnetic ring is made up of inner core (20) and excitation winding (21), and excitation winding is that P1 is to pole; Outer magnetic ring is made up of pole permanent magnet outer core and P2, and adjacent permanent magnet polarity is contrary; Described adjustable magnetic ring is alternately made up of Ns block iron core and Ns block non-magnet material, and Ns=P1+P2; Described internal magnetic ring is as stator, and outer magnetic ring and adjustable magnetic ring are as mover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510328018.9A CN104883031A (en) | 2015-06-15 | 2015-06-15 | Cylindrical-type linear magnetic gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510328018.9A CN104883031A (en) | 2015-06-15 | 2015-06-15 | Cylindrical-type linear magnetic gear |
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| CN104883031A true CN104883031A (en) | 2015-09-02 |
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| CN201510328018.9A Pending CN104883031A (en) | 2015-06-15 | 2015-06-15 | Cylindrical-type linear magnetic gear |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070040384A1 (en) * | 2003-04-14 | 2007-02-22 | Hans Bernhoff | Wave power assembly with an electromagnetic dampning means |
| CN102324827A (en) * | 2011-10-11 | 2012-01-18 | 中国矿业大学 | Brushless direct current motor |
| CN104061116A (en) * | 2014-06-12 | 2014-09-24 | 东南大学 | Wave energy power generating device based on serial connection linear magnetic gear motor |
| CN204928532U (en) * | 2015-06-15 | 2015-12-30 | 兰州理工大学 | Drum formula straight line magnetic force gear |
-
2015
- 2015-06-15 CN CN201510328018.9A patent/CN104883031A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070040384A1 (en) * | 2003-04-14 | 2007-02-22 | Hans Bernhoff | Wave power assembly with an electromagnetic dampning means |
| CN102324827A (en) * | 2011-10-11 | 2012-01-18 | 中国矿业大学 | Brushless direct current motor |
| CN104061116A (en) * | 2014-06-12 | 2014-09-24 | 东南大学 | Wave energy power generating device based on serial connection linear magnetic gear motor |
| CN204928532U (en) * | 2015-06-15 | 2015-12-30 | 兰州理工大学 | Drum formula straight line magnetic force gear |
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Application publication date: 20150902 |
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