CN105915024A - High-performance field modulation magnetic gear - Google Patents
High-performance field modulation magnetic gear Download PDFInfo
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- CN105915024A CN105915024A CN201610369559.0A CN201610369559A CN105915024A CN 105915024 A CN105915024 A CN 105915024A CN 201610369559 A CN201610369559 A CN 201610369559A CN 105915024 A CN105915024 A CN 105915024A
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- Prior art keywords
- speed rotor
- high speed
- magnetic
- permanent magnet
- low speed
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K51/00—Dynamo-electric gears, i.e. dynamo-electric means for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts
Abstract
A high-performance field modulation magnetic gear comprises a magnetic field modulation ring, a low-speed rotor, a high-speed rotor, and a shell. The magnetic field modulation ring is coaxially and fixedly installed outside the low-speed rotor and the high-speed rotor, and the lateral end faces of the magnetic field modulation ring are respectively aligned with the outer end faces of the low-speed rotor and the high-speed rotor. A radial air gap is arranged between the magnetic field modulation ring and the high-speed and low-speed rotors, and an axial gap is arranged between the high-speed and low-speed rotors, so that the high-speed and low-speed rotors can rotate freely. The magnetic gear of the invention has the characteristics of small torque ripple, good transmission stability, strong torque transmission capacity, and fast transient response.
Description
Technical field
The present invention relates to a kind of high-performance field modulation magnetic gear, belong to gear-driven technical field.
Background technology
Compared with mechanical gear, magnetic gear utilizes magnetic field coupling to carry out the transmission of torque, and being that one is non-connects
, there is not the problems such as noise, vibrations, frictional dissipation and lubrication in touch variable speed drive, and can be real
Physical isolation between now inputting and exporting, is also equipped with overload self-shield ability.In recent years, along with high-performance neodymium
The development of ferrum B permanent magnetic material, the research of New Magnetic Field Controlled gear topological structure is of increased attention.
Torque transfer capability and transmission stability are to evaluate two important indicators of magnetic gear performance, compared to biography
System conversion type magnetic gear, field modulation type magnetic gear based on the work of magnetic field modulation principle has higher torque transmission
Ability, is the study hotspot of current magnetic field of gears.Field modulation type magnetic gear is typically by high speed rotor, low speed rotation
Son and adjustable magnetic ring are constituted, and the magnetic inductive block arranged by equi-spaced apart due to adjustable magnetic ring is constituted, so magnetic circuit magnetic conductance is uneven
Even, and the permanent magnet pole logarithm of high speed rotor is less, and the torque pulsation causing high speed rotor is relatively big, there is magnetic
The phenomenon that gear torque transmission is unstable.Meanwhile, in actual applications, when drivewheel rotating speed Rapid Variable Design,
Secondary speed under magnetic field coupling drives is followed delayed, the situation of rotating speed " step-out " often occurs.Currently
The coaxial type field modulation magnetic gear of most study, static adjustable magnetic ring is disposed coaxially between high, low speed rotor,
Cause magnetic Gear Processing to manufacture difficulty and Mechanical Reliability is the highest.
A kind of magnetic field modulation type coaxial magnetic gear, Chinese patent disclosed in Chinese patent CN105141109
The magnetic-field modulation-type permanent magnet gear of magnetic structure improvement, Chinese patent disclosed in CN203979331
A kind of dynamo-electric integrated magnetic field modulation type magnetic gear disclosed in CN104333197, magnetic gear disclosed in above-mentioned patent
Although being capable of higher torque transfer capability, but in structure, all use coaxial design, at least there is two-layer
Air gap, can only use monolateral supporting way fixed rotor, add difficulty of processing, reduce Mechanical Reliability,
And the pulsation of magnetic gear torque is suppressed and improves the technology that transmission stability aspect does not suggests that in structure
Corrective measure；A kind of axial magnetic field modulation system magnetic gear disclosed in Chinese patent CN104682660, although
The dynamic property of magnetic gear can be improved, but inner and outer Rotator is only the annular element being made up of permanent magnet,
And arrange for concentric, structure is complicated, and difficulty of processing is big, and Mechanical Reliability is low.Therefore, to there is machinery can
By property height, torque transfer capability by force, torque pulsation is little, the research of the magnetic gear topological structure that transmission stability is good
There is important theory significance and engineering practical value.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of high-performance field modulation magnetic gear.
The present invention can solve the problem that the torque pulsation that existing field modulation type magnetic gear exists is big, transmission stability is poor and
The problem of dynamic following poor performance.
Technical scheme is as follows:
A kind of high-performance field modulation magnetic gear, including adjustable magnetic ring, low speed rotor, high speed rotor and shell；Described
The coaxial heart of adjustable magnetic ring is fixedly mounted on the outside of low speed rotor and high speed rotor, and the both sides end face of adjustable magnetic ring is respectively
Align with the end face outside of low speed rotor and high speed rotor.
According to currently preferred, described low speed rotor and high speed rotor arranged in co-axial alignment vertically, between be provided with axle
To gap；Described adjustable magnetic ring and low speed rotor, high speed rotor outer surface between be provided with radial air gap.Set herein
Meter ensure that high, low speed rotor normally rotates.
According to currently preferred, described adjustable magnetic ring include along the circumferential direction and in equi-spaced apart arrangement a plurality of
The magnetic conduction bar being parallel to each other.
According to currently preferred, described low speed rotor is annular, including low speed rotor iron core with at described low speed
The low speed rotor permanent magnet that rotor core surface equi-spaced apart is embedded, described low speed rotor permanent magnet inclines vertically
Tiltedly.The advantage herein designed is, can be greatly reduced low speed rotor torque pulsation, improves magnetic gear torque and passes
Dynamic stability.For realizing optimum performance, in actual application, " oblique pole " inclined angle alpha needs to be optimized design.
According to currently preferred, described high speed rotor is the built-in loop configuration of V-arrangement permanent magnet.
According to currently preferred, described high speed rotor includes high speed rotor iron core, at described high speed rotor iron core
The V-arrangement high speed rotor permanent magnet being inside embedded and the rotor bar arranged in described high speed rotor iron core.
According to currently preferred, described rotor bar equi-spaced apart is inserted and is arranged on described high speed rotor iron core
In the iron core of every pole, described rotor bar becomes the whole of Guan Bi conducting by being positioned at the end ring welding at high speed rotor two ends
Body.This design can effectively suppress rotor speed to vibrate and reduce the transient response time of magnetic gear.
According to currently preferred, described V-arrangement high speed rotor permanent magnet is axially inclined, turns in described high speed
The rotor bar arranged in sub-iron core is the most axially inclined.The advantage herein designed is, can be greatly reduced height
Speed rotor torque pulsation, improves magnetic gear torque transmission stability.
According to currently preferred, described shell is annular, is set in the outside of described adjustable magnetic ring, is used for fixing
Described adjustable magnetic ring；Described shell and adjustable magnetic ring use interference mode to assemble.
According to currently preferred, described low speed rotor permanent magnet magnetizing direction is identical, forms unipolarity structure.
The most inside or magnetize the most in the same direction, form unipolarity structure, adjacent with described low speed rotor permanent magnet
Low speed rotor iron core serves as another pole.Compared with bipolarity permanent magnet surface-mount type structure, this design can reduce
In the case of permanent magnet consumption, remain to keep high torque (HT) transmission capacity, thus effectively reduce processing cost.
According to currently preferred, described V-arrangement high speed rotor permanent magnet is along the side perpendicular with embedding direction
To magnetizing, and be positioned at same extremely under the magnetizing direction of V-arrangement high speed rotor permanent magnet contrary.This designs shape
Magneticfocusing N-S field structure, i.e. every pole is become to be provided magnetic circuit by two pieces of permanent magnet parallel connections, it is possible to improve gas
Gap magnetic is close, such that it is able to be greatly improved the torque transfer capability of magnetic gear.Pass to obtain the torque of optimum
Pass ability, in actual application, also can be to the placed angle of high speed rotor V-arrangement permanent magnet and dimensional parameters
It is optimized design.
According to currently preferred, every pole iron core of described high speed rotor iron core is convex structure.Described convex is tied
Structure is to use similar sine curve arc top shape.This structure can be greatly improved high speed rotor side air gap magnetic density waveform
Sine degree, reduce the torque pulsation of high speed rotor, thus improve the gear-driven stability of magnetic.In order to obtain
Optimal performance, in actual application, can specifically optimize design to this convex structure shape.High speed rotor iron core
The convex structure of the similar sine curve arc top shape that pole uses is equally applicable to such as rotor permanent magnet and uses spoke
The magnetic design of gears of bar damascene structures.
According to currently preferred, in described magnetic gear, the axial length L of described adjustable magnetic rings, low speed rotor
Axial length Ll, the axial length L of high speed rotorh, axial gap between low speed rotor and high speed rotor
Distance LgBetween meet following relation:
Ls=Ll+Lg+Lh。
According to currently preferred, in described magnetic gear, number N of described low speed rotor permanent magnetl, adjustable magnetic ring
Number N of magnetic conduction bars, number N of V-arrangement high speed rotor permanent magnethMeet following relation:
Nh=4 × (Ns-Nl)。
According to currently preferred, in described magnetic gear, gear shift gear ratio GrMeet:
Gr=4Nl:Nh。
According to currently preferred, the magnetic conduction bar of described adjustable magnetic ring, low speed rotor iron core, high speed rotor iron core are
Silicon steel laminations or other permeability magnetic material.The stator-rotor iron core manufacturing process phase of its preparation technology and permagnetic synchronous motor
With.
According to currently preferred, described low speed rotor permanent magnet, high speed rotor permanent magnet by rare-earth Nd-Fe-B or
Other permanent magnet material is made.
According to currently preferred, described shell is non-magnet material.Having certain mechanical strength, it processes work
Skill is identical with motor housing processing technique.
According to currently preferred, described shell is aluminium material.
Present invention have an advantage that
1., in the magnetic gear of the present invention, the high speed rotor permanent magnet of V-arrangement arrangement is built in high speed rotor iron core,
Be in same extremely under high speed rotor permanent magnet magnetizing direction contrary, it is possible to produce poly-magnetic effect, it is thus possible to significantly
Improve the torque transfer capability of magnetic gear.
2., in the magnetic gear of the present invention, high speed rotor every pole iron core uses the convex of similar sine curve arc top shape
Structure, can make high speed rotor side air gap magnetic density waveform closer to sine wave, be conducive to reducing rotor torque pulsation,
It is thus possible to improve the transmission stability of magnetic gear.
3., in the magnetic gear of the present invention, equi-spaced apart inserts the rotor bar in the iron core of high speed rotor every pole, is leading
During the sudden change of driving wheel rotating speed, it is possible to induce magnetic field, effectively suppress the speed oscillation of driven pulley, reduce transient response
Time, the generation of prevention rotating speed " step-out " situation.
4., in the magnetic gear of the present invention, low speed rotor permanent magnet equi-spaced apart embeds low speed rotor core exterior surface,
Low speed rotor permanent magnet magnetizing direction is identical, magnetizes the most inside or outward, forms unipolarity structure, phase
Low speed rotor core portion between adjacent low speed rotor permanent magnet then serves as another pole.With bipolarity permanent magnet Surface Mount
Formula structure is compared, and this same polarity surface embedded type permanent magnet arrangement is in the feelings not reducing torque transfer capability
Under condition, it is possible to reduce permanent magnet consumption, thus reduce processing cost.
5. in the magnetic gear of the present invention, low speed rotor permanent magnet uses " oblique pole " structure, it is possible to effectively reduces and turns
Sub-torque pulsation, thus improve the gear-driven stability of magnetic.
6., in the magnetic gear of the present invention, the permanent magnet embedded structure that high, low speed rotor uses, with tradition magnetic tooth
The rotor permanent magnet surface-mount type structure that wheel is conventional is compared, it is possible to effectively prevent permanent magnet from occurring when rotor rotates de-
Fall, further increase the Mechanical Reliability of magnetic gear.
7., in the magnetic gear of the present invention, adjustable magnetic ring uses externally positioned type structure, and high, low speed rotor is positioned at adjustable magnetic ring
Portion, and divide row both sides vertically, compared with traditional coaxial configuration, carried magnetic gear operational reliability is higher,
And manufacturing process is simple, easy to process.
8. the present invention is obtained in that preferable runnability, is conducive to reducing rotor torque pulsation, improving magnetic gear
The stability of transmission, and torque transfer capability can be improved, improve Mechanical Reliability simultaneously, reduce and add
Work cost of manufacture.
Accompanying drawing explanation
Fig. 1 is the magnetic gear low speed rotor lateral section structure of the present invention；
Fig. 2 is the magnetic high-speed gear rotor-side cross section structure of the present invention；
Fig. 3 is the axial arrangement schematic diagram of the magnetic gear low speed rotor of the present invention；
Fig. 4 is traditional rotor permanent magnet surface-mount type coaxial magnetic gear cross section structure；
In Fig. 1-4: 1, adjustable magnetic ring；11, adjustable magnetic ring magnetic conduction bar；2, low speed rotor；21, low speed rotor ferrum
Core；22, low speed rotor permanent magnet；3, high speed rotor；31, high speed rotor iron core；32, high speed rotor is forever
Magnet；33, rotor bar；4, shell；5, radial air gap；6, outer air gap；7, interior air gap；Vertically
The inclined angle alpha tilted.In figure, arrow represents permanent magnet magnetizing direction.
Detailed description of the invention
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited to this.
As Figure 1-4.
Embodiment 1,
A kind of high-performance field modulation magnetic gear, including adjustable magnetic ring 1, low speed rotor 2, high speed rotor 3 and shell
4；The described coaxial heart of adjustable magnetic ring 1 is fixedly mounted on low speed rotor 2 and the outside of high speed rotor 3, adjustable magnetic ring
The both sides end face of 1 end face outside with low speed rotor 2 and high speed rotor 3 respectively is alignd.
Embodiment 2,
A kind of high-performance field modulation magnetic gear, its difference is, described low speed rotor 2
With high speed rotor 3 arranged in co-axial alignment vertically, between be provided with axial gap；Described adjustable magnetic ring 1 and low speed rotor 2,
Radial air gap 5 it is provided with between the outer surface of high speed rotor 3.
Embodiment 3,
A kind of high-performance field modulation magnetic gear as described in embodiment 1,2, its difference is, described adjustable magnetic ring
1 includes along the circumferential direction and a plurality of magnetic conduction bar 11 being parallel to each other of arrangement in equi-spaced apart.
Embodiment 4,
A kind of high-performance field modulation magnetic gear as described in embodiment 1-3, its difference is, described low speed rotor
2 is annular, including low speed rotor iron core 21 and is embedded in described low speed rotor iron core 21 surface equi-spaced apart
Low speed rotor permanent magnet 22, described low speed rotor permanent magnet 22 is axially inclined.
Embodiment 5,
A kind of high-performance field modulation magnetic gear as described in embodiment 1-4, its difference is, described high speed rotor
3 is the built-in loop configuration of V-arrangement permanent magnet.Described high speed rotor 3 includes high speed rotor iron core 31, in institute
The V-arrangement high speed rotor permanent magnet 32 that is embedded in stating high speed rotor iron core 31 and at described high speed rotor iron core 31
The rotor bar 33 of interior setting.
Described rotor bar 33 equi-spaced apart is inserted in the every pole iron core being arranged on described high speed rotor iron core 31,
Described rotor bar 33 becomes the entirety of Guan Bi conducting by being positioned at the end ring welding at high speed rotor 3 two ends.
Embodiment 6,
A kind of high-performance field modulation magnetic gear, its difference is, described V-arrangement is at a high speed
Rotor permanent magnet 32 is axially inclined, the rotor bar 33 also edge arranged in described high speed rotor iron core 31
Axially inclined.
Embodiment 7,
A kind of high-performance field modulation magnetic gear, its difference is, described shell 4 is ring
Shape, is set in the outside of described adjustable magnetic ring 1, is used for fixing described adjustable magnetic ring 1；Described shell 4 and adjustable magnetic ring
1 uses interference mode to assemble.Described low speed rotor permanent magnet 22 magnetizing direction is identical, forms unipolarity structure.
Embodiment 8,
A kind of high-performance field modulation magnetic gear, its difference is, described V-arrangement is at a high speed
Rotor permanent magnet 32 along with embed perpendicular direction, direction and magnetize, and be positioned at same extremely lower V-arrangement at a high speed turn
The magnetizing direction of sub-permanent magnet 32 is contrary.
Every pole iron core of described high speed rotor iron core 31 is convex structure.
Embodiment 9,
A kind of high-performance field modulation magnetic gear as described in embodiment 1-8, its difference is, in described magnetic gear,
The axial length L of described adjustable magnetic rings, the axial length L of low speed rotorl, the axial length L of high speed rotorh、
Axial gap distance L between low speed rotor and high speed rotorgBetween meet following relation:
Ls=Ll+Lg+Lh。
In described magnetic gear, number N of described low speed rotor permanent magnetl, number N of adjustable magnetic ring magnetic conduction bars、V
Number N of shape high speed rotor permanent magnethMeet following relation:
Nh=4 × (Ns-Nl)。
In described magnetic gear, gear shift gear ratio GrMeet:
Gr=4Nl:Nh。
Embodiment 10,
A kind of high-performance field modulation magnetic gear as described in embodiment 1-9, its difference is, described adjustable magnetic ring
Magnetic conduction bar, low speed rotor iron core, high speed rotor iron core are silicon steel laminations or other permeability magnetic material.
Described low speed rotor permanent magnet, high speed rotor permanent magnet are made up of rare-earth Nd-Fe-B or other permanent magnet material.
Described shell is non-magnet material.Preferably, described shell is aluminium material.
The magnetic field modulation function of adjustable magnetic ring 1 in the present invention, it is possible to by low speed rotor permanent magnet 22, high speed rotor
The permanent magnetic field that permanent magnet 32 produces produces a series of space harmonics magnetic fields in radial air gap internal modulation, when at a high speed
The number of pole-pairs that rotor permanent magnet 32, low speed rotor permanent magnet 22 produce is equal to wherein any one harmonic field
During number of pole-pairs, by magnetic field coupling, magnetic gear can be realized as stable torque transmission.In order to realize becoming
The effect of speed transmission and the torque transfer capability of optimum, number N of described low speed rotor permanent magnet 22l、
Number N of adjustable magnetic ring magnetic conduction bar 11s, number N of high speed rotor permanent magnet 32hShould meet following relation:
Nh=4 × (Ns-Nl) (1)
Now, described magnetic gear high, low speed rotary speed of rotator is than meeting:
ωh:ωl=4Nl:Nh (2)
ωh、ωlIt is respectively described magnetic gear high, low speed rotor angular velocity of rotation.Accordingly, described magnetic gear energy
Enough variator drive ratio G realizedrFor:
Gr=4Nl:Nh (3)
Compared with the conventional coaxial magnetic gear shown in Fig. 4, the generally outer static adjustable magnetic of the magnetic gear that the present invention relates to
Ring, inner rotor core, can use for reference existing external stator, the processing of inner-rotor type permanent magnetic brushless and dress completely
Method of completing the square makes, easy to process, Mechanical Reliability is higher.Meanwhile, high speed rotor V-arrangement is embedded forever
The convex structure of the similar sine curve arc top shape that magnet structure, high speed rotor every pole iron core uses, high speed turn
" oblique pole " structure that sliver that sub-iron core is inserted into, low speed rotor permanent magnet use, above-mentioned many measures all have
It is beneficial to improve the performance of magnetic gear, be allowed to have that torque pulsation is little, torque transfer capability is strong, transmission stability is good,
The advantage that transient response is fast.Magnetic gear structure involved in the present invention design is more reasonable, manufacturing cost is lower, property
Can be more superior, it is the high-performance field modulation magnetic gear that a kind of cost performance is higher.
Claims (10)
1. a high-performance field modulation magnetic gear, including adjustable magnetic ring, low speed rotor, high speed rotor and shell；
It is characterized in that, the described coaxial heart of adjustable magnetic ring is fixedly mounted on the outside of low speed rotor and high speed rotor, adjustable magnetic
The both sides end face of ring end face outside with low speed rotor and high speed rotor respectively is alignd.
A kind of high-performance field modulation magnetic gear the most according to claim 1, it is characterised in that described low
Speed rotor and high speed rotor arranged in co-axial alignment vertically, between be provided with axial gap；Described adjustable magnetic ring and low speed rotor,
It is provided with radial air gap between the outer surface of high speed rotor.
A kind of high-performance field modulation magnetic gear the most according to claim 2, it is characterised in that described tune
Magnet ring includes along the circumferential direction and a plurality of magnetic conduction bar being parallel to each other of arrangement in equi-spaced apart.
A kind of high-performance field modulation magnetic gear the most according to claim 3, it is characterised in that described low
Speed rotor be annular, including low speed rotor iron core and described low speed rotor iron core surface equi-spaced apart be embedded low
Speed rotor permanent magnet, described low speed rotor permanent magnet is axially inclined.
A kind of high-performance field modulation magnetic gear the most according to claim 4, it is characterised in that described height
Speed rotor is the built-in loop configuration of V-arrangement permanent magnet；Described high speed rotor includes high speed rotor iron core, in institute
The V-arrangement high speed rotor permanent magnet being embedded in stating high speed rotor iron core and setting in described high speed rotor iron core
Rotor bar；Described rotor bar equi-spaced apart is inserted in the every pole iron core being arranged on described high speed rotor iron core,
Described rotor bar becomes the entirety of Guan Bi conducting by being positioned at the end ring welding at high speed rotor two ends.
A kind of high-performance field modulation magnetic gear the most according to claim 5, it is characterised in that described V
Shape high speed rotor permanent magnet is axially inclined, and the rotor bar arranged in described high speed rotor iron core is the most vertically
Tilt.
A kind of high-performance field modulation magnetic gear the most according to claim 1, it is characterised in that outside described
Shell is annular, is set in the outside of described adjustable magnetic ring, is used for fixing described adjustable magnetic ring；Described shell and adjustable magnetic ring
Interference mode is used to assemble.
A kind of high-performance field modulation magnetic gear the most according to claim 5, it is characterised in that described low
Speed rotor permanent magnet magnetizing direction is identical, forms unipolarity structure；Described V-arrangement high speed rotor permanent magnet along with
Embed perpendicular direction, direction to magnetize, and be positioned at same extremely under the side of magnetizing of V-arrangement high speed rotor permanent magnet
To on the contrary；Preferably, every pole iron core of described high speed rotor iron core is convex structure.
A kind of high-performance field modulation magnetic gear the most according to claim 5, it is characterised in that described magnetic
In gear, the axial length L of described adjustable magnetic rings, the axial length L of low speed rotorl, high speed rotor axial
Length Lh, axial gap distance L between low speed rotor and high speed rotorgBetween meet following relation:
Ls=Ll+Lg+Lh；
Preferably, in described magnetic gear, number N of described low speed rotor permanent magnetl, adjustable magnetic ring magnetic conduction bar
Number Ns, number N of V-arrangement high speed rotor permanent magnethMeet following relation:
Nh=4 × (Ns-Nl)；
Preferably, in described magnetic gear, gear shift gear ratio GrMeet:
Gr=4Nl:Nh。
A kind of high-performance field modulation magnetic gear the most according to claim 5, it is characterised in that described tune
The magnetic conduction bar of magnet ring, low speed rotor iron core, high speed rotor iron core are silicon steel laminations or other permeability magnetic material；
Preferably, described low speed rotor permanent magnet, high speed rotor permanent magnet are by rare-earth Nd-Fe-B or other permanent magnetism material
Material is made；
Preferably, described shell is non-magnet material；Preferably, described shell is aluminium material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610369559.0A CN105915024A (en) | 2016-05-27 | 2016-05-27 | High-performance field modulation magnetic gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369559.0A CN105915024A (en) | 2016-05-27 | 2016-05-27 | High-performance field modulation magnetic gear |
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| CN105915024A true CN105915024A (en) | 2016-08-31 |
Family
ID=56741681
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| CN201610369559.0A Pending CN105915024A (en) | 2016-05-27 | 2016-05-27 | High-performance field modulation magnetic gear |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106712452A (en) * | 2017-01-24 | 2017-05-24 | 东南大学 | Dual permanent magnet built-in magnetism gathering type magnetic gear |
| CN107612286A (en) * | 2017-11-07 | 2018-01-19 | 重庆大学 | A kind of combined type brushless electric machine |
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| CN107612286A (en) * | 2017-11-07 | 2018-01-19 | 重庆大学 | A kind of combined type brushless electric machine |
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Application publication date: 20160831 |
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| RJ01 | Rejection of invention patent application after publication |