CN107800213A - Combined high-speed permanent magnet machine rotor and its manufacture method - Google Patents
Combined high-speed permanent magnet machine rotor and its manufacture method Download PDFInfo
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- CN107800213A CN107800213A CN201710963743.2A CN201710963743A CN107800213A CN 107800213 A CN107800213 A CN 107800213A CN 201710963743 A CN201710963743 A CN 201710963743A CN 107800213 A CN107800213 A CN 107800213A
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- permanent magnets
- permanent magnet
- axle
- magnet machine
- machine rotor
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011888 foil Substances 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 239000011889 copper foil Substances 0.000 claims abstract description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 13
- 239000004917 carbon fiber Substances 0.000 claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 7
- 239000003292 glue Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000004046 wet winding Methods 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000003984 copper intrauterine device Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
Abstract
The present invention relates to a kind of combined high-speed permanent magnet machine rotor and its manufacture method, described rotor is made up of axle, permanent magnets, copper foil, carbon fiber, the body of axle has wrapped permanent magnets, metal foil, high strength fibre successively from the inside to surface, the position for being used to fix permanent magnets on the body of the axle forms recess by lathe process, its both ends is machined for limiting the boss of the permanent magnets, this is different from prior art, and prior art is to form end by interference fit.In the present invention, the boss at both ends can stop that the part of centre moves left and right, most important for high speed rotational structure.This and integrally formed production technology, significantly enhance the integrally-built stability of rotor.
Description
Technical field
The invention belongs to high-speed electric expreess locomotive field, and in particular to a kind of combined high-speed permanent magnet machine rotor and its manufacturer
Method.
Background technology
The main flow structure of current high speed permanent magnet motor rotor is as shown in figure 1, permanent magnet is pasted in the outer surface of magnetic conductive axis 1 with glue
Block 2, then outer ring is followed successively by metallic shield set 3 (aluminium set either copper sheathing) and carbon fiber sheath 4, last both ends add not magnetic conduction
Pressing plate 5 is compressed for protecting permanent magnet blocks 2.The major defect of the structure is：
(1) the metallic shield set outside permanent magnet and carbon fiber sheath are required for after being fabricated separately, and are then passed through
The amount of being full of is set with, and the method for use generally requires rotor progress liquid nitrogen cooling suit and either axially adds very big pressure to be pressed
Dress, this manufacture craft are extremely complex and inefficient；
(2) permanent magnet often first magnetizes, its powerful magnetic force, assembling can be made extremely difficult, easily cause assembler
People is injured；
(3) in order to protect permanent magnet, often both ends will also increase end plate by being interference fitted.
The content of the invention
The present invention is for permanent magnet machine rotor manufacturing process in the prior art is complicated, manufacture efficiency is low, assembling is difficult dangerous
The problem of big, disclose a kind of method for manufacturing rotor of more handy and safe and rotor rational in infrastructure.Specifically disclose one
The manufacture method of kind combined high-speed permanent magnet machine rotor, composite permanent magnet motor rotor are fine by axle, permanent magnets, metal foil, carbon
The step of dimension is formed, and above-mentioned metal foil is the metal of conductive metal foil, preferably good conductivity, and it is manufactured is as follows：
S1：The axle of processing rotor, the middle of the axle form recess, and boss is left in both sides；
S2：Permanent magnets are made up of some small permanent magnets, with glue by ring of the small permanent magnets along axle and axial seamless unoccupied place
It is adhered on axle, is in line between the small permanent magnets along the ring and axial direction of axle；
S3：The permanent magnets that the small permanent magnets are spliced into are wound with metal foil, winding gross thickness is according to collection skin effect
The depth of penetration answered determines；
S4：The outer surface that metal foil is wrapped up is wound with high strength fibre；
S5：Selection resin passes through wet-winding craft；
S6：Solidified resin；
S7：High strength fibre surface is finished；
S8：Overall magnetize is carried out to rotor.
Preferably, in step s3, metal foil most in one layer and one layer of outermost be bonded by glue, mid-wrap
Process applies tension force, and stress is no more than its yield strength caused by tension force.
The permanent magnet machine rotor produced according to upper art method, the body of axle have wrapped permanent magnetism successively from the inside to surface
Block, metal foil, high strength fibre, the position for being used to fix permanent magnets on the body of the axle form recess by lathe process,
Its both ends is machined for limiting the boss of the permanent magnets, and this is different from prior art, and prior art is to pass through interference
Cooperatively form end.In the present invention, the boss at both ends can stop that the part of centre moves left and right, for high speed rotational structure extremely
Close important.This and integrally formed production technology, significantly enhance the integrally-built stability of rotor.
Preferably, the permanent magnets that the recess of axle wraps are spliced to form by the small permanent magnets of some piecemeals, described small
Permanent magnets adapt to axle camber structure.Permanent magnet, which crosses conference, causes compacting sintering process yields low, therefore the permanent magnetism of big motor
Body can not make whole cylinder type, the particularly motor in more than 50KW, and permanent magnet can not make whole cylinder type.
In the present invention, small permanent magnets are the arcuate structure of piecemeal, and the quantity of circumferential and axial pastes small permanent magnets as desired.Small permanent magnetism
Block does not magnetize, easily can be adhered to by glue on axle.Small permanent magnets ring and axially filling are full, alignment arrangement, it is small forever
There can be small gap between magnetic patch, but it is uniform, and also gap is smaller better.
Preferably, the gap that small permanent magnets are spliced to form is in line.Because small permanent magnets are polarizeds, identical polar
Permanent magnet to align, otherwise can cancel out each other magnetic field).
Preferably, the metal foil is wrapped in permanent magnets, and winding gross thickness determines according to kelvin effect, the copper foil
When being wrapped in permanent magnets, one layer of most the inside and outermost are bonded using glue, the preferred epoxies of glue, are primarily due to carbon fibre
Dimension solidification needs to use and epoxy resin, the thickness range of the metal foil is 0.1-0.2mm.
Copper foil thickness in monolayer is that d=0.1mm or so copper foil is optimal, the total length that width L covers for magnet steel, or magnetic
The one of the integer point of steel covering total length, winding gross thickness Δ determines according to kelvin effect.
It is introduced below by taking red copper as an example,
The magnetic conductivity of μ-material, unit H/m, the π * 10 of magnetic conductivity 4 of red copper-7H/m；
The electrical conductivity of σ-material, unit S/m, the electrical conductivity 5.8*10 of red copper7S/m；
F-electromagnetic frequency, unit Hz, the carrier frequency of frequency converter is generally taken, this place takes 8kHz.
The depth of penetration of Δ=kelvin effect, by μ, σ, f numerical value substitute into (1) formula, calculate Δ=0.74*10-3m；
Preferably, the thickness of the metal foil is 0.1mm, because 0.1mm metal foil is easily bought, it is too thick soft
Toughness deficiency is too thin to be easily damaged.
Preferably, high strength fibre described above can select carbon fiber, Kev to draw either glass fibre, and this three
Kind of fiber has the advantages of high intensity, high-modulus and low-density, and in engineering most frequently with fiber, technical maturity can
Lean on.
Preferably, the metal foil of the good conductivity such as metal foil red copper, aluminium, silver.
The present invention is relative to prior art, advantage：
(1) pretightning force winding is applied using copper foil outside permanent magnet and carries out higher hamonic wave magnetic field shielding, substitute traditional gold
Belong to sheath, it is not necessary to which accurate protective metal shell Vehicle Processing, material caused by reducing Vehicle Processing and manpower waste；
(2) it is set with after the shaping of traditional fiber jacket and then finishing, and the heat of the high strength fibre sheath such as carbon fiber
The coefficient of expansion is almost 0, and suit is extremely difficult, and this mode is unserviceable in the present invention, using carbon fiber or triumphant
The high strength fibres such as Fu La apply pretightning force and carry out Wet Winding Process solidification, can strengthen the stability of rotor；
(3) rotor is unified curing molding and then magnetized after being carried out using magnet charger to rotor, instead preceding permanent magnet
First magnetize the assembly technology assembled afterwards.The mode of magnetizing can avoid the magnetic force of permanent magnet assembling process afterwards, therefore assemble simple, essence
Degree is high, will not produce the situation for causing injury to personnel because permanent magnet magnetic force is excessive.
Brief description of the drawings
In order to illustrate more clearly of the present invention, the required accompanying drawing used is simply situated between in being described below to embodiment
Continue.It should be evident that drawings in the following description are only the description to embodiments of the invention, for ordinary skill
For personnel, without having to pay creative labor, simple deformation or title can also be carried out according to technical scheme
Change, or customary means is taken, goal of the invention can also be realized.
Fig. 1：Prior art axial, cross-sectional view
Fig. 2：A kind of axial, cross-sectional view of combined high-speed permanent magnet machine rotor
Fig. 3：A kind of circumferential section figure of combined high-speed permanent magnet machine rotor
Embodiment
With reference to embodiment, the present invention is described in further detail, following examples be explanation of the invention and
The invention is not limited in following examples.
Embodiment 1
As shown in Figure 2,3, present embodiment discloses a kind of combined high-speed permanent magnet machine rotor manufacture method, and according to
The product that this method is produced.The step of it is produced is as follows：
Axle 1 is permeability magnetic material, and the present embodiment uses No. 45 steel, is processed into structure shown in Fig. 2, and there is a recess centre,
Boss is left in both sides, and it acts on the effect such as prior art end plates 5 (such as Fig. 1), can stop that the part of centre moves left and right,
It is most important for high speed rotational structure.
In this programme, permanent magnets 2 are made up of some small permanent magnets, and small permanent magnets are arcuate structure, the number of circumferential and axial
Amount is pasted as desired.Permanent magnets 2 do not magnetize, can be easily adhered on axle 1 by glue.Permanent magnets 2 by it is small forever
Magnetic patch is full in ring and axially filling, alignment arrangement, and the gap between permanent magnets 2 will be in line.
Then entered with red copper foil 3 and permanent magnets are wound, the thickness in monolayer d=0.1mm of red copper foil 3 in the present embodiment,
Width L is the total length of permanent magnets covering, or the one of the integer point of permanent magnets covering total length, winding gross thickness Δ according to
Kelvin effect determines.
The magnetic conductivity of μ-material, unit H/m, the π * 10 of magnetic conductivity 4 of red copper-7H/m；
The electrical conductivity of σ-material, unit S/m, the electrical conductivity 5.8*10 of red copper7S/m；
F-electromagnetic frequency, unit Hz, the carrier frequency of frequency converter is generally taken, this place takes 8kHz.
The depth of penetration of Δ=kelvin effect, unit m, by μ, σ, f numerical value substitute into formula, calculate Δ=0.74*10- 3m；
Then the winding number of plies of the present embodiment is Δ/d=7.4 layers, and round numbers is 8 layers.In order to prevent releasing, copper foil first
The ending of layer and last layer is bonded by glue, and mid-wrap process applies tension force, and stress can not surpass caused by tension force
Cross its yield strength.
After the glue curing of copper foil to be bonded, start the winding of high strength fibre, high strength fibre selection carbon fiber.So
Suitable resin is selected to pass through wet-winding craft according to fiber feature afterwards.The present embodiment selects carbon fiber, Choice of Resin high temperature
Epoxies, the present embodiment are reachable from the epoxy resin of Da Sen companies, model DS -900, its specification such as following table, temperature in use
200℃。
Rotor after winding, is integrally placed in incubator, and the temperature and time of solidification is set according to resin solidification requirement.
Rotor after solidification, its permanent magnets, red copper foil, carbon fiber wire and resin have been fully cured integrally.Then
Carbon fiber surface is finish-machined to final size.
Rotor number of pole-pairs and magnetizing direction design magnetized head according to required for final, then carry out overall fill to rotor
Magnetic.For high-speed electric expreess locomotive, the number of pole-pairs of its rotor is usually 1 or 2, and magnetizing direction is usually parallel magnetization or radially filled
Magnetic.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, without departing from the inventive concept of the premise, can also make some improvements and modifications, these improvements and modifications also should be regarded as
In protection scope of the present invention.Although the present invention is disclosed as above with embodiment, it is not limited to the protection of the present invention
Scope, any technical staff for being familiar with this technology, in the variation and retouching made without departing from the spirit and scope of the invention,
Protection scope of the present invention all should be belonged to.
Claims (10)
- A kind of 1. combined high-speed permanent magnet machine rotor, it is characterised in that it is made up of axle, permanent magnets, copper foil, carbon fiber, it is described The body of axle wraps permanent magnets, the metal foil with conducting function, high strength fibre, the axle sheet successively from the inside to surface The position that body is used to fix permanent magnets forms recess, and its both ends has the boss for limiting the permanent magnets.
- A kind of 2. combined high-speed permanent magnet machine rotor as claimed in claim 1, it is characterised in that the recess parcel of the axle Fixed permanent magnets are spliced to form by the small permanent magnets of some piecemeals, and the small permanent magnets adapt to axle camber structure.
- A kind of 3. combined high-speed permanent magnet machine rotor as claimed in claim 2, it is characterised in that the small permanent magnets splicing The gap of formation is in line.
- 4. any one combined high-speed permanent magnet machine rotor as described in claims 1 to 3, it is characterised in that the metal Paper tinsel is wrapped in permanent magnets, and winding gross thickness determines according to kelvin effect, when the metal foil is wrapped in permanent magnets, most the inside And one layer of outermost is bonded using glue, the thickness range of the metal foil is 0.1mm-0.2mm.
- 5. any one combined high-speed permanent magnet machine rotor as described in claims 1 to 3, it is characterised in that the metal The thickness of paper tinsel is 0.1mm.
- 6. a kind of combined high-speed permanent magnet machine rotor as claimed in claim 4, it is characterised in that the glue is epoxies Glue.
- 7. any one combined high-speed permanent magnet machine rotor as described in claims 1 to 3, it is characterised in that described height Strength is carbon fiber, Kev is drawn or glass fibre.
- 8. any one combined high-speed permanent magnet machine rotor as described in claims 1 to 3, it is characterised in that described gold Category paper tinsel is red copper, aluminium or silver.
- 9. a kind of manufacture method of combined high-speed permanent magnet machine rotor, the combined type adjust permanent magnet machine rotor by axle, forever Magnetic patch, metal foil, carbon fiber composition, it is characterised in that comprise the following steps：S1：The axle of processing rotor, the middle of the axle form recess, and boss is left in both sides；S2：Permanent magnets are divided into some small permanent magnets, with glue is by ring of the small permanent magnets along axle and axially seamless unoccupied place is bonded Onto axle, the gap between the small permanent magnets is straight line；S3：The permanent magnets that the small permanent magnets are spliced into are wound with copper foil, winding gross thickness determines according to kelvin effect；S4：The outer surface that copper foil wraps up is wound with high strength fibre；S5：Selection resin passes through wet-winding craft；S6：Solidified resin；S7：High strength fibre surface is finished；S8：Overall magnetize is carried out to rotor.
- A kind of 10. manufacture method of combined high-speed permanent magnet machine rotor as claimed in claim 9, it is characterised in that：It is described In step S3, the copper foil most in one layer and one layer of outermost be bonded by glue, mid-wrap process applies tension force, because opening Stress is no more than its yield strength caused by power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710963743.2A CN107800213A (en) | 2017-10-17 | 2017-10-17 | Combined high-speed permanent magnet machine rotor and its manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710963743.2A CN107800213A (en) | 2017-10-17 | 2017-10-17 | Combined high-speed permanent magnet machine rotor and its manufacture method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107800213A true CN107800213A (en) | 2018-03-13 |
Family
ID=61533180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710963743.2A Pending CN107800213A (en) | 2017-10-17 | 2017-10-17 | Combined high-speed permanent magnet machine rotor and its manufacture method |
Country Status (1)
| Country | Link |
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| CN (1) | CN107800213A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048575A (en) * | 2019-05-17 | 2019-07-23 | 陈益广 | A kind of composite construction p-m rotor suitable for high-speed permanent magnetic synchronous motor |
| CN110676986A (en) * | 2019-10-17 | 2020-01-10 | 新疆金风科技股份有限公司 | Forming method of magnetic pole protective layer of outer rotor of motor |
| CN110994844A (en) * | 2019-12-30 | 2020-04-10 | 沈阳工业大学 | High-speed permanent magnet motor rotor with shielding layer |
| CN111654130A (en) * | 2020-04-22 | 2020-09-11 | 天津大学 | Composite rotor structure of energy storage flywheel high-speed permanent magnet synchronous motor |
| CN111725922A (en) * | 2020-06-30 | 2020-09-29 | 稳力(广东)科技有限公司 | Motor sheath device |
| CN111923395A (en) * | 2020-09-16 | 2020-11-13 | 北京航空航天大学 | Circumferential vertical winding preparation method for composite rotor of high-speed permanent magnet synchronous motor |
| CN113824227A (en) * | 2021-08-25 | 2021-12-21 | 施宾德斯能源科技(苏州)有限公司 | Sheath structure of motor rotor and preparation method |
| US11837935B2 (en) | 2021-02-02 | 2023-12-05 | Black & Decker, Inc. | Canned brushless motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048575A (en) * | 2019-05-17 | 2019-07-23 | 陈益广 | A kind of composite construction p-m rotor suitable for high-speed permanent magnetic synchronous motor |
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| CN110676986A (en) * | 2019-10-17 | 2020-01-10 | 新疆金风科技股份有限公司 | Forming method of magnetic pole protective layer of outer rotor of motor |
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| CN111654130A (en) * | 2020-04-22 | 2020-09-11 | 天津大学 | Composite rotor structure of energy storage flywheel high-speed permanent magnet synchronous motor |
| CN111654130B (en) * | 2020-04-22 | 2022-08-09 | 天津大学 | Composite rotor structure of energy storage flywheel high-speed permanent magnet synchronous motor |
| CN111725922A (en) * | 2020-06-30 | 2020-09-29 | 稳力(广东)科技有限公司 | Motor sheath device |
| CN111923395A (en) * | 2020-09-16 | 2020-11-13 | 北京航空航天大学 | Circumferential vertical winding preparation method for composite rotor of high-speed permanent magnet synchronous motor |
| US11837935B2 (en) | 2021-02-02 | 2023-12-05 | Black & Decker, Inc. | Canned brushless motor |
| US11855521B2 (en) | 2021-02-02 | 2023-12-26 | Black & Decker, Inc. | Brushless DC motor for a body-grip power tool |
| US11870316B2 (en) | 2021-02-02 | 2024-01-09 | Black & Decker, Inc. | Brushless motor including a nested bearing bridge |
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Address after: No.34 Muning Road, Binhai New Area, Tianjin 300450 Applicant after: TIANJIN EMAGING HIGH SPEED MOTOR TECHNOLOGY Co.,Ltd. Applicant after: Tianjin Feixuan Technology Co.,Ltd. Address before: No.34 Muning Road, Binhai New Area, Tianjin 300450 Applicant before: TIANJIN EMAGING HIGH SPEED MOTOR TECHNOLOGY Co.,Ltd. Applicant before: TIANJIN EMAGING TECHNOLOGY Co.,Ltd. |
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Application publication date: 20180313 |