CN102312986B - Outer rotor magnetic flux collecting magnetic gear - Google Patents

Outer rotor magnetic flux collecting magnetic gear Download PDF

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Publication number
CN102312986B
CN102312986B CN201110237629.4A CN201110237629A CN102312986B CN 102312986 B CN102312986 B CN 102312986B CN 201110237629 A CN201110237629 A CN 201110237629A CN 102312986 B CN102312986 B CN 102312986B
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magnetic
rotor
gear
magnetic gear
adjustable
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CN102312986A (en
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程明
李祥林
邹国棠
花为
杜怿
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Southeast University
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Southeast University
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Abstract

The invention discloses an outer rotor magnetic flux collecting magnetic gear. The magnetic gear has an axial structure, and the section of the magnetic gear comprises a magnetic gear outer rotor, a magnetic flux adjusting ring and a magnetic gear inner rotor from outside to inside in sequence; the magnetic gear outer rotor, the magnetic flux adjusting ring and the magnetic gear inner rotor are coaxial and are independent of one another; an outer air gap (3) is formed between the magnetic gear outer rotor and the magnetic flux adjusting ring; an inner air gap (6) is formed between the magnetic flux adjusting ring and the magnetic gear inner rotor; the magnetic gear outer rotor and the magnetic gear inner rotor freely rotate and are connected with a driving or driven component to perform torque transfer respectively; and the middle magnetic flux adjusting ring is in a stationary state and is fixed at the two axial ends. Through the outer rotor magnetic flux collecting magnetic gear, the torque transfer capacity of the magnetic gear can be improved.

Description

Outer rotor magnetic flux collecting magnetic gear
Technical field
The present invention relates to a kind of outer rotor magnetism-gathering magnetic gear, be applicable to Non-contact speed-changing and drive occasion, the present invention relates to motor, mechanical field.
Background technique
In commercial Application, much need the occasion of variable speed drives, conventionally utilize the bulky mechanical devices such as gear-box to realize.The use of a large amount of mechanical devices will inevitably bring the problems such as noise, vibrations, frictional loss and periodic maintenance, and will obviously increase complexity, the volume and weight of system.In addition, mechanical gear does not possess overload self-protection ability, when transmitting torque surpasses its gear ability to bear, security incident easily occurs.
Comparatively speaking, magnetic gear is a kind of non-contact type drive mechanism, does not have noise, vibrations, frictional loss and the problem such as lubricated, and can realize the physical isolation between input and output, possesses the self-protection of overload ability, and safety reliability is higher.Torque transfer capability is the important performance indexes of magnetic gear always, and for a long time, the restriction of permanent magnetic material performance and magnetic circuit topological structure causes the torque transfer capability of magnetic gear always lower.Calendar year 2001, along with a kind of proposition of Surface mounted type coaxial magnetic gear structure, the torque transfer capability of magnetic gear is greatly improved, and therefore, magnetic gear becomes the study hotspot of Chinese scholars again.Yet traditional Surface mounted type coaxial magnetic gear still has amendatory space at aspects such as torque transfer capability, rotor mechanical stress and manufacturing degree of difficulties.Therefore, the New Magnetic Field Controlled gear topological structure of research high torque (HT) transmission capacity has important theory significance and practical construction value.
Summary of the invention
technical problem:the present invention is directed to the shortcoming of conventional surface mounted type coaxial magnetic gear, proposed a kind of outer rotor magnetic flux collecting magnetic gear, object is to improve the torque transfer capability of magnetic gear, and facilitates manufacturing.
technological scheme:for solving the problems of the technologies described above, the present invention proposes a kind of outer rotor magnetic flux collecting magnetic gear, this magnetic gear is axial arrangement, its cross section comprises magnetic gear external rotor from outside to inside successively, adjustable magnetic ring and magnetic gear internal rotor, described magnetic gear external rotor, adjustable magnetic ring and magnetic gear internal rotor concentric and separate, between magnetic gear external rotor and adjustable magnetic ring, be provided with outer air gap, between adjustable magnetic ring and magnetic gear internal rotor, be provided with interior air gap, magnetic gear external rotor and magnetic gear internal rotor rotate freely, connect respectively driving or driven parts and carry out transmission of torque, middle adjustable magnetic ring remains static, at axial two ends, be fixed,
Described magnetic gear external rotor comprises that external rotor is unshakable in one's determination, the outer rotor permanent magnet of embedding external rotor iron core, and external rotor iron core and outer rotor permanent magnet form a whole;
Described adjustable magnetic ring comprises non-magnetic of adjustable magnetic ring and adjustable magnetic ring magnetic inductive block, and non-magnetic of adjustable magnetic ring and adjustable magnetic ring magnetic inductive block are crisscross arranged and interconnect and form adjustable magnetic ring;
Described magnetic gear internal rotor comprises that internal rotor is unshakable in one's determination, is affixed on internal rotor surperficial internal rotor permanent-magnetic body unshakable in one's determination.
Preferably, this magnetic gear external rotor adopts embedded external rotor permanent magnet body structure unshakable in one's determination, and outer rotor permanent magnet is along circumference cutting orientation magnetizing, and adjacent outer rotor permanent magnet magnetizing direction is contrary, form magneticfocusing N-S structure, the iron core between adjacent outer rotor permanent magnet is used for providing flux paths.
Preferably, described external rotor iron core, adjustable magnetic ring magnetic inductive block, internal rotor iron core consists of permeability magnetic material.
Preferably, permeability magnetic material is silicon steel laminations.
Preferably, non-magnetic of described adjustable magnetic ring consists of non-magnet material.
Preferably, non-magnet material is epoxy resin.
Preferably, described outer rotor permanent magnet and internal rotor permanent-magnetic body are made by permanent-magnet material.
Preferably, permanent-magnet material is rare-earth Nd-Fe-B.
beneficial effect:
1) compare with conventional surface mounted type coaxial magnetic gear, the present invention embeds outer rotor permanent magnet in external rotor iron core, proposed a kind of magneticfocusing structure, this structure contributes to improve the air gap flux density of outer air gap, thereby effectively improves the torque transfer capability of magnetic gear;
2) change on this outer-rotor structure, when improving torque transfer capability, does not increase torque ripple amplitude, can guarantee the stability of transmission of torque;
3) outer rotor magnetism-gathering structure is compared with conventional surface mounted type structure, aspect manufacturing, is easier to realize, and is conducive to reduce manufacturing cost.
Accompanying drawing explanation
Fig. 1-outer rotor magnetic flux collecting magnetic gear cross section structure;
Fig. 2-conventional surface mounted type magnetic gear cross section structure;
The local magnetic circuit distribution schematic diagram of Fig. 3-magneticfocusing magnetic pole;
The local magnetic circuit distribution schematic diagram of Fig. 4-surface-mount type magnetic pole;
In figure: external rotor iron core 1, outer rotor permanent magnet 2, outer air gap 3, non-magnetic 4, adjustable magnetic ring, adjustable magnetic ring magnetic inductive block 5, interior air gap 6, internal rotor iron core 7, internal rotor permanent-magnetic body 8.
Embodiment
The present invention will be described below with reference to accompanying drawings.
Outer rotor magnetic flux collecting magnetic gear provided by the invention is a kind of non-contact type drive mechanism, can be used for variable speed drives occasion, have the advantages that torque density is high, its structure comprises magnetic gear external rotor, adjustable magnetic ring and magnetic gear internal rotor, magnetic gear external rotor comprises that external rotor is unshakable in one's determination, the cuboid shape permanent magnet of embedding external rotor iron core; Adjustable magnetic ring comprises non-magnetic of adjustable magnetic ring, adjustable magnetic ring magnetic inductive block; Magnetic gear internal rotor comprises that internal rotor is unshakable in one's determination, is affixed on internal rotor surperficial permanent magnet unshakable in one's determination; Between magnetic gear external rotor and adjustable magnetic ring, be provided with outer air gap; Between adjustable magnetic ring and magnetic gear internal rotor, be provided with interior air gap.
Described external rotor iron core, adjustable magnetic ring magnetic inductive block, internal rotor iron core consist of silicon steel laminations or other permeability magnetic material.
Non-magnetic described of adjustable magnetic ring consists of epoxy resin or other non-magnet material.
The cuboid shape permanent magnet of described embedding external rotor iron core is made by rare-earth Nd-Fe-B material or other permanent-magnet material with the permanent magnet that is affixed on internal rotor surface unshakable in one's determination.
The cuboid shape permanent magnet of described embedding external rotor iron core is along circumference cutting orientation magnetizing, and adjacent permanent magnet magnetizing direction is contrary, forms magneticfocusing N-S structure.
The described permanent magnet radial magnetizing that is affixed on internal rotor surface unshakable in one's determination, and adjacent permanent magnet magnetizing direction is contrary, forms N-S structure.
Outer rotor magnetic flux collecting magnetic gear of the present invention is axial arrangement, referring to Fig. 1, its cross section comprises magnetic gear external rotor, adjustable magnetic ring and magnetic gear internal rotor from outside to inside successively, this magnetic gear external rotor comprises external rotor unshakable in one's determination 1 and outer rotor permanent magnet 2, outer rotor permanent magnet 2 embeds in external rotor iron core 1, and the two mutually bonds and form a whole; Adjustable magnetic ring comprises non-magnetic 4, adjustable magnetic ring and adjustable magnetic ring magnetic inductive block 5; Magnetic gear internal rotor comprises internal rotor unshakable in one's determination 7 and internal rotor permanent-magnetic body 8, and internal rotor permanent-magnetic body 8 is affixed on internal rotor 7 surfaces unshakable in one's determination; Between magnetic gear external rotor and adjustable magnetic ring, be provided with outer air gap 3, to guarantee the normal rotation of magnetic gear external rotor; Between adjustable magnetic ring and magnetic gear internal rotor, be provided with interior air gap 6, to guarantee the normal rotation of magnetic gear internal rotor.
Described magnetic gear external rotor, adjustable magnetic ring and magnetic gear internal rotor, three's concentric and separate, magnetic gear external rotor and magnetic gear internal rotor can rotate freely, connect respectively driving or driven parts and carry out transmission of torque, middle adjustable magnetic ring remains static, and at axial two ends, is fixed.
Described external rotor iron core 1, adjustable magnetic ring magnetic inductive block 5, internal rotor iron core 7 consist of silicon steel laminations or other permeability magnetic material, identical with the rotor core manufacturing process of common permagnetic synchronous motor.
Non-magnetic 4 described, adjustable magnetic ring consists of epoxy resin or other non-magnet material, be crisscross arranged successively along circumference with adjustable magnetic ring magnetic inductive block 5, mutually be bonded together and form adjustable magnetic ring, be fixedly mounted between magnetic gear external rotor and magnetic gear internal rotor, in order to obtain higher torque transfer capability, non-magnetic 4 and the width ratio of magnetic inductive block 5 on circumference are controlled at 1:1 left and right and are advisable.
The cuboid shape permanent magnet 2 of described embedding external rotor iron core 1 is made by rare-earth Nd-Fe-B material or other permanent-magnet material with the permanent magnet 8 that is affixed on internal rotor 7 surfaces unshakable in one's determination.
The cuboid shape permanent magnet 2 of described embedding external rotor iron core 1 is along circumference cutting orientation magnetizing, and adjacent permanent magnet magnetizing direction is contrary, form magneticfocusing N-S structure, external rotor iron core 1 plays the effect that flux paths is provided, in order to obtain higher torque density and to save permanent magnet consumption, the width ratio of permanent magnet 2 and unshakable in one's determination 1 on circumference is controlled at 3:5 left and right and is advisable.
Described permanent magnet 8 radial magnetizings that are affixed on internal rotor 7 surfaces unshakable in one's determination, and adjacent permanent magnet magnetizing direction is contrary, forms N-S structure.
Referring to Fig. 3, in magneticfocusing structure, each equivalent magnetic pole is to be formed by two cuboid shape permanent magnet actings in conjunction along circumference cutting orientation magnetizing, can realize certain poly-magnetic effect.Compare the Surface mounted type structure in Fig. 4, in the situation that permanent magnet consumption is equal, magneticfocusing structure can improve the Magnetic flux density in outer air gap 3, thereby can effectively improve torque transfer capability.
The magnetic field modulation function of adjustable magnetic ring, the magnetic field modulation that magnetic gear external rotor (internal rotor) permanent magnet can be produced becomes a series of space harmonics magnetic field, as long as magnetic gear internal rotor (external rotor) permanent magnet pole logarithm equals the wherein number of pole-pairs of any one harmonic field, magnetic gear just can be realized stable transmission of torque.In order to realize the effect of speed change, the number of pole-pairs of the harmonic field that General Requirements is selected can not equal the number of pole-pairs of modulated magnetic gear external rotor (internal rotor) permanent magnet.During the number of pole-pairs sum of the number of pole-pairs of the harmonic field that equals to select when the quantity of adjustable magnetic ring magnetic inductive block and modulated magnetic gear external rotor (internal rotor) permanent magnet, can realize maximum torque transfer capability.Be that magnetic gear outer rotor permanent magnet number of pole-pairs, adjustable magnetic ring magnetic inductive block quantity, magnetic gear internal rotor permanent-magnetic body number of pole-pairs should meet following relation:
(1)
n s , p pmo , p pmi be respectively adjustable magnetic ring magnetic inductive block quantity, magnetic gear outer rotor permanent magnet number of pole-pairs, magnetic gear internal rotor permanent-magnetic body number of pole-pairs.Now, magnetic gear internal rotor and magnetic gear external rotor rotational speed are than meeting:
(2)
, be respectively magnetic gear internal rotor rotational speed, magnetic gear external rotor rotational speed, negative sign represents that magnetic gear inner and outer Rotator sense of rotation is contrary.
In addition, meeting under the condition of (1) formula, in order to reduce internal rotor torque pulsation, selected n s , p pmi least common multiple between value should be large as far as possible,, meeting under the needs of rotating ratio meanwhile, n s , p pmo , p pmi value can not be selected excessive, in order to avoid increase the difficulty of manufacturing.
Compare with the conventional surface mounted type magnetic gear structure shown in Fig. 2, in the situation that magnetic gear outside dimension is equal with inner and outer Rotator permanent magnet consumption, the outer rotor magnetism-gathering structure that the present invention adopts, in the situation that not increasing output torque ripple amplitude, not only can reduce outer rotor permanent magnet interelectrode magnetic leakage, and poly-magnetic effect can effectively increase the Magnetic flux density of outer air gap 3, thereby make the torque transfer capability of magnetic gear improve about 25%.In addition, outer rotor magnetic flux collecting magnetic gear aspect processing and fabricating cost and external rotor mechanical stress also outline be better than conventional surface mounted type magnetic gear.
The foregoing is only preferred embodiments of the present invention; protection scope of the present invention is not limited with above-mentioned mode of execution; in every case the equivalence that those of ordinary skills do according to disclosed content is modified or is changed, and all should include in the protection domain of recording in claims.

Claims (1)

1. an outer rotor magnetic flux collecting magnetic gear, it is characterized in that: this magnetic gear is axial arrangement, its cross section comprises magnetic gear external rotor from outside to inside successively, adjustable magnetic ring and magnetic gear internal rotor, described magnetic gear external rotor, adjustable magnetic ring and magnetic gear internal rotor concentric and separate, between magnetic gear external rotor and adjustable magnetic ring, be provided with outer air gap (3), between adjustable magnetic ring and magnetic gear internal rotor, be provided with interior air gap (6), magnetic gear external rotor and magnetic gear internal rotor rotate freely, connect respectively driving or driven parts and carry out transmission of torque, middle adjustable magnetic ring remains static, at axial two ends, be fixed,
Described magnetic gear external rotor comprises external rotor (1) unshakable in one's determination, embeds the outer rotor permanent magnet (2) of external rotor (1) unshakable in one's determination, and external rotor (1) unshakable in one's determination and outer rotor permanent magnet (2) form a whole;
Described adjustable magnetic ring comprises adjustable magnetic ring non-magnetic (4) and adjustable magnetic ring magnetic inductive block (5), and adjustable magnetic ring non-magnetic (4) and adjustable magnetic ring magnetic inductive block (5) are crisscross arranged and interconnect and form adjustable magnetic ring;
Described magnetic gear internal rotor comprises internal rotor (7) unshakable in one's determination, is affixed on the internal rotor permanent-magnetic body (8) on internal rotor iron core (7) surface;
This magnetic gear external rotor adopts embedded external rotor permanent magnet body structure unshakable in one's determination, outer rotor permanent magnet is along circumference cutting orientation magnetizing, and adjacent outer rotor permanent magnet magnetizing direction is contrary, form magneticfocusing N-S structure, the iron core between adjacent outer rotor permanent magnet is used for providing flux paths.
CN201110237629.4A 2011-08-18 2011-08-18 Outer rotor magnetic flux collecting magnetic gear Active CN102312986B (en)

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WO2014109268A1 (en) * 2013-01-11 2014-07-17 日立金属株式会社 Magnetic gear device
CN103715860B (en) * 2013-12-18 2016-03-02 江苏大学 A kind of magnetic-field-enhanced high torque density magneto planetary gear
CN105071620B (en) * 2015-08-26 2018-08-07 江苏大学 A kind of built-in permanent magnetic error-tolerance type vernier motor having poly- magnetic effect
CN106787479A (en) * 2016-12-29 2017-05-31 江苏金陵永磁产业研究院有限公司 A kind of preparation method for modulating ring
CN106787609B (en) * 2017-03-30 2018-11-02 华中科技大学 A kind of magnetic field modulation type magnetic-gear of high torque density
CN108683321B (en) * 2018-05-03 2020-10-30 华中科技大学 Magnetic gear device with iron yoke grooved
CN112473251A (en) * 2020-11-18 2021-03-12 华中科技大学 Magnetic gear variable speed type oil smoke separation structure and range hood
CN112615520B (en) * 2020-11-30 2021-12-14 珠海格力电器股份有限公司 Magnetic gear and composite motor with same
CN113501115A (en) * 2021-07-30 2021-10-15 上海交通大学 Underwater vehicle magnetic gear coupling propulsion system, working method and underwater vehicle

Citations (1)

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Publication number Priority date Publication date Assignee Title
CN101267152B (en) * 2008-04-21 2010-07-07 上海大学 Magnetic field modulation magnetic gear

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Publication number Priority date Publication date Assignee Title
CN101662202A (en) * 2009-09-25 2010-03-03 上海大学 Magnetic field modulating type concentric magnetic gear transmission device in Halbach magnet structure
CN202203361U (en) * 2011-08-18 2012-04-25 东南大学 Outer rotor magnetism-gathering magnetic gear

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101267152B (en) * 2008-04-21 2010-07-07 上海大学 Magnetic field modulation magnetic gear

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