CN104505990B - Preparation method for sintering permanent magnetic ferrite ring of brushless motor - Google Patents
Preparation method for sintering permanent magnetic ferrite ring of brushless motor Download PDFInfo
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- CN104505990B CN104505990B CN201410468555.9A CN201410468555A CN104505990B CN 104505990 B CN104505990 B CN 104505990B CN 201410468555 A CN201410468555 A CN 201410468555A CN 104505990 B CN104505990 B CN 104505990B
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Abstract
The invention discloses a preparation method for a sintering permanent magnetic ferrite ring of a brushless motor, and an objective is to provide a preparation method for a sintering permanent magnetic ferrite bead of a brushless motor, and the method improves magnetic flux density and solves a problem that cracking is easy to occur in a sintering process. The main technology comprises pre-magnetizing blank, breaking and preparing materials, drying and sintering, grinding, and magnetizing, so as to prepare and produce a multipolar magnetic ring whose peak value is 2000 Gs after magnetizing, and solve problems that the inner and outer circles of the magnetic crack caused by the difference value of shrinking percentages in a sintering process of a multipolar molded workblank body. Beneficial effects of the method are that the problems that the inner and outer circles of the magnetic crack caused by the difference value of shrinking percentages in a sintering process of the multipolar molded workblank body is solved, the method ensures the hardness of a mold cavity and service life of moulds, greatly restrains magnetic ring products from cracking in sintering, and improves magnetic flux density of a multipolar radiation magnetic ring.
Description
Technical field
The present invention relates to permanent magnetism ferrite sintered body magnet prepares correlative technology field, refer in particular to a kind of brushless electric machine sintering
The preparation method of permanent-magnetic oxyferrite magnetic ring.
Background technology
With magnetic technology development, there is peak flux density and be more than or equal to the fine magnetic property of 2000Gs and magnetize as radially
The permanent magnetism ferrite sintered body magnet ring of multipole is widely used in the fields such as AC servo motor, DC brushless motor.And be to reach section
Can, efficiently require, electric motor lightweight, miniaturization are a kind of trend.With respect to the motor being assemblied to form by multi-disc magnetic shoe,
The made motor of this kind of opposite sex ring can greatly reduce motor volume and quality, reduce the difficulty of assembling, therefore high surface magnetic flux is close
Degree multi-pole magnet-ring increasingly obtains the favor of client.
Currently, Chinese patent Authorization Notice No.：CN2881913Y, in authorized announcement date on March 21st, 2007, discloses
A kind of structural improvement of the Special magnetic-field orientation forming module that permanent magnetic ferrite magnetic powder is carried out with particular orientation.Including lead,
It is arranged on the upper die component between lead and lower mold assemblies, it is characterized in that in described upper die component and lower mold assemblies periphery point
It is not provided with reach the standard grade bag and offline bag；Upper core is provided with upper die component；Lower mold assemblies are provided with lower cavity die, described lower cavity die
Bottom be cased with a lower punch, lower punch is furnished with one and is located on lower cavity die and can contact with upper core
Core bar, between described core bar and lower cavity die formed a die cavity；Above-mentioned upper core end external diameter is not less than the external diameter of core bar,
Upper core contact with core bar one end external diameter be not more than core bar external diameter.This utility model is exactly to make spoke using press moulding mode
To magnet ring, but this utility model is only suitable for producing the radial magnet ring of ferrite that surface magnetic flux density is 700～900Gs, and not
The multipole permanent-magnet ferrite ring that surface magnetic flux density reaches 2000Gs can be prepared.
And it is directed to the problem of Cracking that high-performance permanent magnet ferrite sintered body radiates ring, in published Chinese patent application bulletin
Number：CN101707420A, applies for May 12 2010 day for announcing, discloses brushless motor heteropolarity sintered ferrite rotor magnetic
Stone, it is related to a kind of rotor Magnetitum for frequency conversion type brushless motor, and its production technology is：Buy calcining material → ball from Bei Kuang
Mill → wet type magnetic field orientation → drying → granulate → mixing → press-molding orientation → sintering → outward appearance process → magnetic → inspection
→ packaging → shipment.With published Chinese patent application notification number：CN1441445A, application 2003 days for announcing September 10 days,
Disclose annular magnet that be made up, that there is annular shape of retentive material, it is in pole center position and radially has
The orientation ratio of 50% or bigger easy magnetizing axis of volume, and a kind of method manufacturing annular magnet, orient including one
The step of the Magnaglo of retentive material, the method includes：It is filled in ring mould in being axially molded under stress of ring
Magnaglo；With by means of the multiple magnetic field generation devices being arranged into mould periphery, magnetic field is applied on ring mould.With
Fail to disclose how in upper patent to solve polarity cracking, Patents do not disclose the multipole radiation magnet ring that peak value is 2000Gs yet
Production program.Above innovation and creation more do not solve multipole orientation aftershaping blank body in sintering process due to shrinkage factor difference
The magnet ring problem of Cracking causing.
Content of the invention
The present invention is above-mentioned in order to overcome the shortcomings of to exist in prior art, there is provided a kind of magnetic flux density that improves simultaneously solves
It is susceptible to the preparation method of the brushless electric machine sintered permanent ferrite magnet ring of problem of Cracking in sintering process.
To achieve these goals, the present invention employs the following technical solutions：
A kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring, main technique includes premagnetization blank, crushes
System material, drying and sintering, mill are processed, are magnetized, and to prepare peak value after production is magnetized is the multi-pole magnet-ring of 2000Gs, and solves multipole
The magnet ring inside and outside circle problem of Cracking that type blank body is caused due to shrinkage factor difference in sintering process, concrete operation step is as follows：
(1) by conventional strontium permanent ferrite prefiring material, suppressed through magnetic field orientating by public known wet therapy forming process
Become closely knit blank；
(2) first closely knit blank is dried, then carry out break process, be formed with the dry-pressing opposite sex powder body material being orientated；
(3) it is filled in the dry-pressing opposite sex powder body material in ring mould with the lower molding of axial compressive force；
(4) take out blank after the demoulding, put into and in kiln, be dried sintering；
(5) the blank body after sintering is carried out grinding cylindrical；
(6) the blank body after sintering carries out multipole magnetization, obtains outer peripheral edge magnetic flux density peak value and reach the nothing of 2000Gs opening
Split multi-pole magnet-ring.
Wherein：Surface magnetic flux density value for making product reaches 2000Gs, the dry-pressing opposite sex powder body material of prefabricated powder gained
Magnetic parameter Br (residual magnetic flux density) 3850Gs～4150Gs to be reached of material.For permanent magnetism ferrite sintered body multi-pole magnet-ring
Strong market demand, Magnet manufacturer mainly with rubidium ferrum boron (NdFeB) rare earth permanent magnet magnet as magnetic field occurring source to putting
Enter the opposite sex powder of the dry type in mold cavity and carry out magnetic aligning, then compacting sintering.Such manufacture method can make larger rule
The permanent magnetism ferrite sintered body magnet ring of lattice, its cylindrical magnetic flux density peak value can reach 900Gs～1650Gs.But such method
Prepare magnet ring outer peripheral edge magnetic flux density peak value reach 1680Gs～2000Gs product when it is impossible to solve sintered after produce open
Split phenomenon.The present invention provides a kind of permanent-magnet ferrite multi-pole magnet-ring manufacture method being suitable for larger specification high magnetic characteristics, main work
Skill includes premagnetization blank, broken system material, drying and sintering, mill processing, magnetizes, and can prepare peak value after production is magnetized is 2000Gs
Multi-pole magnet-ring, and solve the magnet ring inside and outside circle that multipole molded blank body caused due to shrinkage factor difference in sintering process and ftracture
Problem.
Preferably, in step (1), conventional strontium permanent ferrite prefiring material adds oxygen in the operation of ball milling
SiClx (SiO2), Calcium Carbonate (CaCO3), cobalt oxide (CoO), chromic oxide (Cr2O3), by public known wet moulding work
Skill is suppressed into, through magnetic field orientating, the closely knit blank that water content is less than 14%.
Preferably, in step (2), dry-pressing opposite sex powder body material adds the poly- enol (PVC) of binding agent to stir after crushing
Mix, the mixing of the auxiliary agent such as ethanol carries out granulating working procedure, and the granular size of pelletize is 30～40 mesh.
Preferably, in step (3), being filled in the dry-pressing opposite sex powder body in ring mould with the lower molding of axial compressive force
The step of material includes：A () automatically pushes away dry-pressing opposite sex powder body material and enters into ring mould and complete packed art；B () magnetic field is sent out
Source of students, its lower mould to axial compressive force, the radial pulse current being mutually paired is applied to dry-pressing opposite sex powder body material simultaneously and produce
Outer rim magnetic field.
Preferably, in step (4), the blank after the demoulding, before putting into kiln, is used plastic film packaging
It is placed in 3S～5S under the high-pressure sealed environment of 160Mpa～200Mpa, now blank uniform stress, blank after sealing
Respectively reduce 1～2.5mm to pressurized contraction.By the enforcement of this high-pressure process, magnet ring product can greatly be suppressed in sintering
Cracking.
Preferably, in step (4), blank is put into tunnel electrical kiln, push kiln with propeller, stove interior temperature is set
1100 DEG C～1250 DEG C of degree, is dried sintering to it.If sintering temperature is too high or too low, it will impact product cracking,
And surface magnetic flux density also can reduce.
Preferably, the magnetic flux density sine waveform of 2000Gs peak value, in step (6), is had on the outer peripheral edge of magnet ring
Or square-wave waveform curve distribution, and number of poles after it magnetizes for the magnet ring be 4 and more than.
Preferably, described ring mould include providing the magnetic conductor in magnetic field, the air core coil in some generation magnetic field and
The corresponding mold cavity of magnet ring number of poles and the inner sleeve ensureing mold cavity hardness, described magnetic conductor is placed in the outer of mold cavity
Portion, described in be placed between magnetic conductor and mold cavity, the fixation of position of described inner sleeve and magnetic conductor, described
Air core coil is evenly distributed on magnetic conductor.
Preferably, described inner sleeve is made using not magnetic conduction hard alloy, the curve of described inner sleeve inwall and mould
The curve of tool die cavity outer wall is consistent, and the wall thickness of described inner sleeve is 0.5～3mm.Inner sleeve adopts not magnetic conduction hard alloy, to ensure type
The hardness in chamber and the life-span of mould；Magnetic conductor due to inner sleeve and offer magnetic field is fixing, such alloy inner sleeve wall thickness control
The requirement of intensity just can be met in 0.5～3mm.
Preferably, described air core coil is distributed row according to the mutual equi-spaced apart of magnet ring number of poles under the guiding of magnetic conductor
It is listed in N, S radial magnetic field in mold cavity, the angle that described single air core coil hollow spacing is formed is A, described magnet ring phase
The angle that adjacent two poles are formed is B, and between wherein A and B, the condition of required satisfaction is 1.8 ＞ B/A ＞ 0.8.Hollow coil institute
There is the capacitor of storage electric charge, storage electric charge in the capacitor sparks, and air core coil is applied in the circuit of composition
Pulse current, thus this air core coil be located circuit in moment pass through electric current, for alleviate its larger current generation coil
Heating, can arrange cooling water, magnetic conductor is cooled down, and so understand under the guiding of magnetic conductor, according to number of magnetic poles mutually etc.
It is arranged in N, S radial magnetic field in mold cavity away from spaced apart, magnetic direction meets and judged with (right hand) Ampere's law.A
The condition of required satisfaction is 1.8 ＞ B/A ＞ 0.8 and B between, is so designed to make magnetic field to dry-pressing in larger degree
Different in nature powder body material single domain particle carries out being orientated and reaches optimal surface magnetic flux density, and the sintering simultaneously reducing multi-pole magnet-ring is opened
Split, otherwise because the magnetic field that the air core coil magnetizing produces excessively is concentrated at pole center, and lead to molded blank part density to be divided
Cloth difference excessive and in sintering process ftracture.
The invention has the beneficial effects as follows：Solve what multipole molded blank body was caused due to shrinkage factor difference in sintering process
Magnet ring inside and outside circle problem of Cracking；Ensure hardness and the mold use life-span of mold cavity；Greatly suppression magnet ring product is burning
Cracking in knot；Improve the magnetic flux density of multipole radiation magnet ring.
Brief description
Fig. 1 is the part-structure generalized section of the present invention；
Fig. 2 is the part-structure schematic diagram in Fig. 1；
Fig. 3 is the monopolar configuration generalized section of the present invention；
Fig. 4 is the structural representation of blank in the present embodiment；
Fig. 5 is the structural representation of molding magnet ring in the present embodiment；
Fig. 6 is the structural representation of another kind of molding magnet ring in the present invention.
In figure：1. magnetic conductor, 2. air core coil, 3. inner sleeve, 4. mold cavity.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
A kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring, main technique includes premagnetization blank, crushes
System material, drying and sintering, mill are processed, are magnetized, and to prepare peak value after production is magnetized is the multi-pole magnet-ring of 2000Gs, and solves multipole
The magnet ring inside and outside circle problem of Cracking that type blank body is caused due to shrinkage factor difference in sintering process, concrete operation step is as follows：
(1) by conventional strontium permanent ferrite prefiring material, suppressed through magnetic field orientating by public known wet therapy forming process
Become closely knit blank；
(2) first closely knit blank is dried, then carry out break process, be formed with the dry-pressing opposite sex powder body material being orientated；
(3) it is filled in the dry-pressing opposite sex powder body material in ring mould with the lower molding of axial compressive force；
(4) take out blank after the demoulding, put into and in kiln, be dried sintering；
(5) the blank body after sintering is carried out grinding cylindrical；
(6) the blank body after sintering is carried out multipole magnetization, obtain the nothing that outer peripheral edge magnetic flux density peak value reaches 2000Gs
Cracking multi-pole magnet-ring.
In step (1), by conventional strontium permanent ferrite prefiring material, the operation of ball milling adds silicon oxide
(SiO2), Calcium Carbonate (CaCO3), cobalt oxide (CoO), chromic oxide (Cr2O3), by public known wet therapy forming process warp
Magnetic field orientating is suppressed into the closely knit blank that water content is less than 14%.
In step (2), dry-pressing opposite sex powder body material adds binding agent to gather enol (PVC) stirring, ethanol etc. after crushing
Auxiliary agent mixing carries out granulating working procedure, and the granular size of pelletize is 30～40 mesh.
In step (3), it is filled in the step of the dry-pressing opposite sex powder body material in ring mould with the lower molding of axial compressive force
Rapid inclusion：A () automatically pushes away dry-pressing opposite sex powder body material and enters into ring mould and complete packed art；B () magnetic field source, it is right
The lower mould of axial compressive force, applies, to dry-pressing opposite sex powder body material, the outer rim magnetic that the radial pulse current being mutually paired produces simultaneously
?.
In step (4), the blank after the demoulding, before putting into kiln, it is placed in after plastic film packaging sealing
3S～5S under the high-pressure sealed environment of 160Mpa～200Mpa, now blank uniform stress, blank is respectively to pressurized receipts
Reduce 1～2.5mm.Then blank is put into tunnel electrical kiln, push kiln with propeller, 1100 DEG C of in-furnace temperature of setting～
1250 DEG C, sintering is dried to it.
Magnetic flux density sine waveform or the square wave of 2000Gs peak value, in step (6), are had on the outer peripheral edge of magnet ring
Wavy curve be distributed, and number of poles after it magnetizes for the magnet ring be 4 and more than.
Wherein：As shown in Figure 1, Figure 2, Figure 3 shows, ring mould includes magnetic conductor 1, the sky in some generation magnetic field providing magnetic field
Wire-core coil 2 mold cavity corresponding with magnet ring number of poles 4 and the inner sleeve 3 ensureing mold cavity hardness, magnetic conductor 1 is placed in mould
The outside of die cavity 4, inner sleeve 3 is placed between magnetic conductor 1 and mold cavity 4, the fixation of position of inner sleeve 3 and magnetic conductor 1, hollow
Coil 2 is evenly distributed on magnetic conductor 1.Inner sleeve 3 is made using not magnetic conduction hard alloy, the curve of inner sleeve 3 inwall and mould
The curve of tool die cavity 4 outer wall is consistent, and the wall thickness of inner sleeve 3 is 0.5～3mm.Air core coil 2 is under the guiding of magnetic conductor according to magnetic
The mutual equi-spaced apart of circumpolar number N, S radial magnetic field in mold cavity arranged evenly, single air core coil 2 hollow spacing is formed
Angle be A, the angle that the two neighboring pole of magnet ring is formed be B, between wherein A and B the condition of required satisfaction be 1.8 ＞ B/A
＞ 0.8.
Now by molding be ends of the earth opposite sex magnet ring product as a example, mold cavity 4 in ring mould is as shown in figure 4, tool
Body implementation steps are as follows：
By conventional strontium permanent ferrite prefiring material, the operation of ball milling adds silicon oxide (SiO2), Calcium Carbonate
(CaCO3), cobalt oxide (CoO), chromic oxide (Cr2O3), it is pressed into through magnetic field orientating by public known wet therapy forming process
It is less than 14% closely knit blank for water content, above raw material standards, according to requirement of the present invention, needs (surplus using Br
Residual magnetism flux density) reach the high-performance Preburning material of 3850～4150Gs.Then closely knit blank is crushed, then dry, mixing is carried out
Granulating working procedure, the granular size of pelletize is 30～40 mesh.
The inner sleeve 3 constituting mold cavity 4 adopts not magnetic conduction hard alloy, to ensure hardness and the circular die of mold cavity 4
The life-span of tool, due to inner sleeve 3 with provide the magnetic conductor 1 in magnetic field to be fixing, so inner sleeve 3 wall thickness control of not magnetic conduction hard alloy
System just can meet the requirement of intensity in 2mm, is worth for 60mm at annular external diameter limit P of the blank that wherein mold cavity 4 is formed,
Take A value for 45 °, B value is 40 °, ring mould places the air core coil 2 producing magnetic field, air core coil 2 applies pulse electricity
Stream, the pulsed magnetic field in testing and control mold cavity 4 is 5000Gs, is molded dry while then electric discharge under press pressure control
Reduce off-flavor powder body material, takes out blank after the demoulding.
The high-pressure sealed environment of 160Mpa～200Mpa will be placed in after the blank plastic film packaging sealing of this molding
Lower 3S～5S, now product blank uniform stress, blank respectively reduces 2.2mm to pressurized contraction, is then putting into tunnel
Road electrical kiln, pushes kiln with propeller, arranges 1230 DEG C of in-furnace temperature, after blank sintering crystallization, product is in P point as shown in Figure 1
Sintering shrinkage is 16.9%, N point sintering shrinkage is 14%.After sintering, profile is illustrated close to circular such as Fig. 5.Assume annular
The mold cavity 4 of mould makes the blank profile as Fig. 5, and the blank that will make as Fig. 6 illustrates after blank sintering is made
Type.
Blank body grinding will be sintered cylindrical, and then carry out the ends of the earth and magnetize.Thus prepare outer peripheral edge magnetic flux density
Peak value reaches the no Crack magnet ring product of 2000Gs.
Claims (9)
1. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring, is characterized in that, main technique includes premagnetization base
Part, broken system material, drying and sintering, mill are processed, are magnetized, and to prepare peak value after production is magnetized is the multi-pole magnet-ring of 2000Gs, and solves
The magnet ring inside and outside circle problem of Cracking that certainly multipole molded blank body is caused due to shrinkage factor difference in sintering process, concrete operations walk
Suddenly as follows：
(1) by strontium permanent ferrite prefiring material, closely knit blank is suppressed into through magnetic field orientating by wet therapy forming process；
(2) first closely knit blank is dried, then carry out break process, be formed with the dry-pressing opposite sex powder body material being orientated；
(3) it is filled in the dry-pressing opposite sex powder body material in ring mould with the lower molding of axial compressive force；
(4) take out blank after the demoulding, put into and in kiln, be dried sintering；Blank after the demoulding before putting into kiln, by it
It is placed in 3s～5s under the high-pressure sealed environment of 160Mpa～200Mpa, now blank uniform with plastic film packaging after being sealed
Stress, blank respectively reduces 1～2.5mm to pressurized contraction；
(5) base substrate after sintering is carried out grinding cylindrical；
(6) base substrate after sintering carries out multipole magnetization, obtains the no cracking multipole that outer peripheral edge magnetic flux density peak value reaches 2000Gs
Magnet ring.
2. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring according to claim 1, is characterized in that,
In step (1), by conventional strontium permanent ferrite prefiring material, the operation of ball milling adds silicon oxide (SiO2), Calcium Carbonate
(CaCO3), cobalt oxide (CoO), chromic oxide (Cr2O3), it is pressed into through magnetic field orientating by public known wet therapy forming process
It is less than 14% closely knit blank for water content.
3. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring according to claim 1, is characterized in that,
In step (2), dry-pressing opposite sex powder body material adds binding agent polyhexene alcohol (PVC) stirring after crushing, and the mixing of ethanol auxiliary agent is carried out
Granulating working procedure, the granular size of pelletize is 30～40 mesh.
4. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring according to claim 1, is characterized in that,
In step (3), the step of the dry-pressing opposite sex powder body material being filled in ring mould with the lower molding of axial compressive force includes：(a)
Automatically push away dry-pressing opposite sex powder body material to enter into ring mould and complete packed art；B () magnetic field source, it is to axial compressive force
Lower mould, applies, to dry-pressing opposite sex powder body material, the outer rim magnetic field that the radial pulse current being mutually paired produces simultaneously.
5. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring according to claim 1, is characterized in that,
In step (4), blank is put into tunnel electrical kiln, push kiln with propeller, 1100 DEG C～1250 DEG C of in-furnace temperature is set, to it
It is dried sintering.
6. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring according to claim 1, is characterized in that,
In step (6), the outer peripheral edge of magnet ring there are the magnetic flux density sine waveform of 2000Gs peak value or square-wave waveform curve divide
Cloth, and number of poles after it magnetizes for the magnet ring be 4 and more than.
7. the preparation method of a kind of brushless electric machine sintered permanent ferrite magnet ring according to claim 1 or 4, its feature
It is that described ring mould includes magnetic conductor (1), the air core coil (2) in some generation magnetic field and the magnet ring number of poles providing magnetic field
Corresponding mold cavity (4) and the inner sleeve (3) ensureing mold cavity (4) hardness, described magnetic conductor (1) is placed in mold cavity
(4) outside, described inner sleeve (3) is placed between magnetic conductor (1) and mold cavity (4), described inner sleeve (3) and magnetic conductor (1)
The fixation of position, described air core coil (2) is evenly distributed on magnetic conductor (1).
8. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring according to claim 7, is characterized in that, institute
The inner sleeve (3) stated is made using not magnetic conduction hard alloy, the curve of described inner sleeve (3) inwall and mold cavity (4) outer wall
Curve consistent, the wall thickness of described inner sleeve (3) is 0.5～3mm.
9. a kind of preparation method of brushless electric machine sintered permanent ferrite magnet ring according to claim 7, is characterized in that, institute
The air core coil (2) stated under the guiding of magnetic conductor (1) according to the mutual equi-spaced apart of magnet ring number of poles arranged evenly in mold cavity
(4) interior N, S radial magnetic field, the angle that single air core coil (2) hollow spacing is formed is A, the two neighboring pole institute of described magnet ring
The angle being formed is B, and between wherein A and B, the condition of required satisfaction is 1.8 ＞ B/A ＞ 0.8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106278223A (en) * | 2016-08-04 | 2017-01-04 | 安徽虹泰磁电有限公司 | Permanent-magnet ferrite dry-pressing multistage magnet ring processing technology |
| CN109509606B (en) * | 2018-12-04 | 2024-04-12 | 杭州史宾纳科技有限公司 | Dry-pressed ferrite multipolar magnetic ring orientator |
| CN109887703B (en) * | 2018-12-04 | 2023-08-15 | 杭州史宾纳科技有限公司 | NdFeB (neodymium iron boron) orientation device of square wave magnetic ring |
| CN109369169B (en) * | 2018-12-10 | 2021-10-26 | 湖南航天磁电有限责任公司 | Method for reducing cracking of dry-pressed strontium ferrite outer radial multi-pole magnetic ring |
| CN110265215A (en) * | 2019-06-06 | 2019-09-20 | 杭州史宾纳科技有限公司 | A kind of radial oriented multi-pole magnet-ring near-net-shape mold of low cost anisotropy sintering permanent magnet ferrite and method |
| CN113555180B (en) * | 2021-06-08 | 2022-12-23 | 横店集团东磁股份有限公司 | Permanent magnetic ferrite ring with annular groove and processing method |
| CN114709066A (en) * | 2022-04-15 | 2022-07-05 | 中钢天源股份有限公司 | Method for manufacturing permanent magnetic ferrite thin-wall magnetic shoe |
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Denomination of invention: A preparation method of sintered permanent magnet ferrite magnetic ring for brushless motor Effective date of registration: 20230522 Granted publication date: 20170215 Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd. Pledgor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Registration number: Y2023330000949 |