CN107332404B - The preparation method of motor internal rotor and the motor internal rotor prepared by this method - Google Patents
The preparation method of motor internal rotor and the motor internal rotor prepared by this method Download PDFInfo
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- CN107332404B CN107332404B CN201710089260.4A CN201710089260A CN107332404B CN 107332404 B CN107332404 B CN 107332404B CN 201710089260 A CN201710089260 A CN 201710089260A CN 107332404 B CN107332404 B CN 107332404B
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- elastomer layer
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Classifications
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- 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
-
- 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
-
- 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
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of preparation methods of motor internal rotor, comprising: elastomer machine-shaping is formed elastomer layer on the outside of hardware；Applying axial compressive force to elastomer layer keeps elastomer layer both ends axially compressed, to make elastomer layer expand in radial direction radiant type, then by 6 magnetic material injection molding of nylon on the outside of elastomer layer；It releases stress to obtain finished product.The present invention also provides the motor internal rotors prepared by this method.The problem of cracking present method avoids 6 magnetic material of injection molding nylon, reduces the weight of motor internal rotor, and reduce production cost.
Description
Technical field
The invention belongs to field of electromechanical technology, in particular it relates to a kind of preparation of DC brushless motor internal rotor
Method and products thereof.
Background technique
DC brushless motor is the energy-saving electric machine of a new generation, substitutes the induction machine or brush motor of older generation.Mainstream is straight
Stream brushless motor divides inner rotor core and outer-rotor structure again.Inner rotor core represents permanent-magnet material in inside, and coiling is in outside.
Outer-rotor structure represents permanent-magnet material in outside, and coiling is in inside.With regard to injecting magnetic used in internal rotor DC brushless motor
For magnetic material, type is very extensive, uses 6 ferrite of nylon and nylon for Price Sensitive market, the most common injecting magnetic
12 two kinds of ferrite materials.The price that 6 ferrite of nylon is molded raw material (injection molding particulate material) is same 12 iron of magnetic property nylon
The price of oxysome half.
Traditional molding mode is that directly injecting magnetic is injected on the outer diameter of metal structure.After the injection of 6 magnetic material of nylon, it
It can begin to cool, and with cooling meat, and internal diameter can not be shunk by supports, and outer diameter is caused to generate huge answer
Power, final 6 magnetic material of nylon before die sinking or die sinking the latter hour internal fissure.In some cases, cracking can be postponed till 6 months
Generation later or even some crackings crack when being final motor use, so cracking is largely that can not pass through full inspection
And prevent.This is a huge quality hidden danger, and there are two common solutions:
(1) 6 injecting magnetic of nylon is substituted using more superior 12 injecting magnetic of nylon of mechanical performance or PPS injecting magnetic, still
Fee of material can increase considerably.
(2) when 6 magnet ring of injection molding nylon, any structural member is not put into mold, so that internal diameter can be with outer diameter one
It rises and shrinks, so that magnet does not crack.But later process need to be added to be sticked on hardware injecting magnetic.So, not only
Increase assembling cost, and cause the Concentricity tolerance of injecting magnetic outer diameter and rotor main shaft big, to increase motor noise and drop
Low electric efficiency.
The plastics bonding magnetic with buffer layer is disclosed application No. is 201110180803.6 Chinese invention patent application
Body p-m rotor and preparation method.The rotor includes metal shaft and bonded permanent magnet, and buffering is arranged between metal shaft and bonded permanent magnet
Layer, this method specifically includes: (1) by buffer layer using molding or by the way of being molded the outside of processing and forming to metal shaft formed it is white
Finished product；(2) the method processing and forming that bonded permanent magnet is molded or is molded forms finished product to the outside of buffer layer.But it forms
The limit shrinkage degree of buffer layer afterwards is often below the cooling shrinkage degree of 6 bonded permanent magnet of nylon, therefore, application No. is
201110180803.6 the disclosed plastic bonded magnets p-m rotor and preparation with buffer layer of Chinese invention patent application
Method can not thoroughly solve the problems, such as that bonded permanent magnet cracks.
Summary of the invention
Goal of the invention of the invention be provide in view of the drawbacks of the prior art a kind of motor internal rotor preparation method and
Its product.
On the one hand, the present invention provides a kind of preparation method of motor internal rotor, include the following steps:
(1) elastomer machine-shaping is formed into elastomer layer on the outside of hardware；
(2) applying axial compressive force to the elastomer layer that step (1) is formed keeps elastomer layer both ends axially compressed, thus
Expand elastomer layer in radial direction radiant type, then by 6 magnetic material injection molding of nylon on the outside of elastomer layer；
(3) it releases stress to obtain finished product.
Preparation method above-mentioned, the elastomer are thermosetting material or thermoplastic material；Preferably, the thermosetting property
Material is rubber, EVA resin or epoxy resin, the thermoplastic material be polypropylene, polyethylene, ABS, PVC, PS, PBT,
PPO, POM, PC or nylon.
Preparation method above-mentioned, the hardware are metal shafts, or the axis with folded silicon steel slice or metallic sheath.
Preparation method above-mentioned, in step (2), applying axial compressive force to elastomer layer makes elastomer layer both ends along axial direction
Unilateral compression 0.001-5.000 millimeters.
Preparation method above-mentioned, unilateral compression 0.01-3.00 millimeters along axial direction of elastomer layer both ends, preferably 0.03-0.50
Millimeter, it is 0.05-0.20 millimeters more preferable.
Preparation method above-mentioned, the 6 magnetic material of nylon is obtained by mixing using nylon 6 as basis material and magnetic powder.
Preparation method above-mentioned, the magnetic powder be ferromagnetic oxide powder, samarium-cobalt magnetic powder, NdFeB magnetic powder, alnico magnetic powder and
Any one or more in samarium iron nitrogen magnetic powder.
Preparation method above-mentioned, in step (1), according to 140-380 DEG C of injection temperature, 20 mm/second of injection speed-
Elastomer is injected on the outside of hardware by 1000 mm/seconds, then 5-180 seconds cooling.
Preparation method above-mentioned, in step (2), according to 190-310 DEG C of injection temperature, 20 mm/second of injection speed-
6 magnetic material of nylon is injected on the outside of elastomer layer by 1000 mm/seconds, then 5-190 seconds cooling.
On the other hand, the present invention also provides the motor internal rotors that above-mentioned preparation method is prepared.
The preparation method and products thereof of motor internal rotor of the invention has the following beneficial effects:
(1) the problem of avoiding 6 magnetic material of injection molding nylon cracking.
(2) since the high molecular material density of elastomer layer is usually 0.8~1.6g/cm3, and injecting magnetic material is usually
3.0~6.0g/cm3, the density of hardware is 6~9g/cm3, rotor weight can be effectively reduced in technical solution of the present invention.
(3) technical solution of the present invention considerably reduces strong to the machinery of injection molding PA6 magnetic material raw material (injection particulate material)
Degree requires, so that it is guaranteed that per kilogram price can be used in 8~15 yuan or so of 6 injecting magnetic raw material of least significant end nylon.
(4) cost for the part high molecular material that elastomer layer uses is lower than 6 magnetic material of nylon, to further decrease entire
The cost of rotor.
Detailed description of the invention
Fig. 1 shows the hardware with elastomer layer, and wherein a is to throw view, and b is sectional view.
Fig. 2 shows internal rotor prepared by embodiment 1, and wherein a is to throw view, and b is sectional view.
Fig. 3 shows internal rotor prepared by embodiment 2, and wherein a is to throw view, and b is sectional view.
Specific embodiment
In order to fully understand the purpose of the present invention, feature and effect, by following specific embodiments, the present invention is made detailed
It describes in detail bright.For process of the invention in addition to following the description, remaining is all made of the conventional method or device of this field.Following nouns
Term is unless otherwise stated, all have the normally understood meaning of those skilled in the art.
For the internal rotor of DC brushless motor, commonly a kind of manufacturing process is using injecting magnetic, and nylon 6 (PA6) is
Most common cheap injecting magnetic, still, if 6 magnetic material direct injection of nylon to be molded over to the hardware of internal rotor
On outer diameter, cracked due to 6 magnetic material cooling meat of nylon, so that there are huge quality hidden danger.
A solution regarding to the issue above is using the method for adding layer injection molding, i.e., in the hardware of internal rotor
Increase elastomer layer between injecting magnetic material, as shown in Figure 1, wherein a is to throw view, b is sectional view.Elastomer layer generallys use
With it is biggish stretch, elasticity and the high molecular material of bending property, when 6 magnetic material cooling meat of nylon, elastomer layer can be with
The contraction of 6 magnetic material of nylon and radial outer diameter shrink axial length increase, thus facilitate reduce by 6 magnetic material of nylon cracking.
But inventors discovered through research that, although the above method can alleviate 6 magnetic material of nylon cracking to a certain extent
The problem of, still, it can not thoroughly solve the problems, such as that 6 magnetic material of nylon cracks, reason is: the limit of elastomer layer after molding
Shrinkage degree is less than the shrinkage degree of the injection molding cooling (that is, liquid becomes solid-state and lasting cooling) of 6 magnetic material of nylon, that is,
Say, 6 magnetic material of nylon injection molding solidify when by liquid switch to solid-state and from form high temperature it is long-range to the shrinkage rates in room temperature stage
In the limit shrinkage degree of elastomer layer.For this problem, inventor proposes following solution party by further furtheing investigate
Case:
According to the first aspect of the invention, the present invention provides a kind of preparation methods of motor internal rotor, including walk as follows
It is rapid:
(1) elastomer machine-shaping is formed into elastomer layer on the outside of hardware.
Wherein, elastomeric material has biggish stretching, elasticity and bending property, can shrink in radial outer diameter when being extruded
Axial length increases.Elastomer can be thermosetting material or thermoplastic material.Thermosetting material can be rubber (for example,
Butadiene-styrene rubber, silicon rubber, butadiene rubber etc.), (i.e. ethylene-vinyl acetate copolymer, vinyl acetate content are EVA resin
5wt%-45wt%) or epoxy resin (for example, propane type epoxy resin of di phenolic group, phenolic aldehyde multi-epoxy resin etc.), thermoplasticity material
Material can be polypropylene, polyethylene, ABS (acrylonitrile-butadiene-styrene copolymer), PVC (polyvinyl chloride), PS (polyphenyl second
Alkene), PBT (polybutylene terephthalate (PBT)), PPO (polyphenylene oxide), POM (polyformaldehyde), PC (polycarbonate) and nylon etc..Before
Stating material can purchase acquisition in conventional market.Elastomer can be assembled on the outside of hardware and form elastomer layer,
Machine-shaping mode can be selected according to the type of elastomeric material, thermosetting material uses hot setting, the temperature of mold
It is 200-280 DEG C, thermoplastic material uses injection molding, makes its melting to thermoplastic material pretreatment at 170-350 DEG C, later
It is injected to mold, the temperature of mold is room temperature to 140 DEG C.
Wherein, elastomer is injected according to 170-350 DEG C of injection temperature, -1000 mm/second of 20 mm/second of injection speed
It is then 5-180 seconds cooling on the outside of to hardware.Preferably, 240-290 DEG C of injection temperature, 100 mm/second of injection speed-
300 mm/seconds, 8-25 seconds cooling time.
Wherein, hardware can be metal shaft, or the axis with folded silicon steel slice or metallic sheath.Other materials,
Such as stainless steel, mild steel, pure iron, aluminium etc. can be employed as hardware as long as sufficiently solid.
(2) hardware containing elastomer that step (1) is formed is put into injection mold, in mold clamping to elasticity
Body layer, which applies axial compressive force, keeps elastomer layer both ends axially compressed, to keep elastomer layer swollen in radial direction radiant type
It is swollen, then by 6 magnetic material injection molding of nylon on the outside of elastomer layer.
Wherein, applying axial compressive force to elastomer layer makes elastomer layer both ends along axial unilateral compression 0.001-5.000 milli
Rice (i.e. unilateral compressed value).Unilateral compressed value is preferably 0.01-3.00 millimeters, and more preferably 0.03-0.50 millimeters, and most preferably
0.05-0.20 millimeters.Applying axial compressive force to elastomer layer keeps elastomer layer both ends axially compressed simultaneously, elastomer layer
Outer diameter increase, thus subsequent 6 magnetic material of nylon be molded solidify when, bigger shrink space can be provided for 6 magnetic material of nylon, with
Just it removes 6 magnetic material outer diameter of nylon and internal diameter shrinks gap bring stress, solve the problems, such as that 6 magnetic material of nylon cracks.In particular, hair
Bright people is by can utmostly eliminate 6 magnetic material outer diameter of nylon the study found that when unilateral compressed value is 0.05-0.20 millimeters
Gap bring stress is shunk with internal diameter, it is most effective to solve the problems, such as to solve 6 magnetic material of nylon cracking.
Wherein, 6 magnetic material of nylon is to be filled magnetic powder thereto using nylon 6 as basis material and be obtained by mixing.Magnetic powder can be with
It is any one or more in ferromagnetic oxide powder, samarium-cobalt magnetic powder, NdFeB magnetic powder, alnico magnetic powder and samarium iron nitrogen magnetic powder.This
Field technical staff can according to need the proportion to select each substance in 6 magnetic material of nylon in actual operation, such as can adopt
With 88-95 parts by weight magnetic powder and 4-11.5 parts by weight nylon 6, in addition it can be further added coupling agent, diffusant and/or
Release agent improves the performance of 6 magnetic material of nylon.
Wherein, 6 magnetic material of nylon is infused according to 190-320 DEG C of injection temperature, -1000 mm/second of 20 mm/second of injection speed
It is mapped on the outside of elastomer layer, it is then 5-90 seconds cooling.Since 6 magnetic material mobility of nylon is very poor, The faster the better for injection speed
And subsequent cooling time should be longer.Preferably, 240-290 DEG C of injection temperature, -450 millimeters of 200 mm/second of injection speed/
Second, 30-60 seconds cooling time.
(3) it releases stress to obtain finished product.
After the injection molding of 6 magnetic material of nylon, as injection molding machine pulls open mold, the pressure of elastomer axial direction disappears, thus in axial direction
Height increases and radial outer diameter is shunk.Elastomer layer outer diameter is punctured into 6 magnetic material of nylon and provides shrink space in internal diameter, thus
It removes 6 magnetic material of nylon and shrinks stress brought by gap in outer diameter and internal diameter, to ensure that 6 magnetic material of internal rotor injection molding nylon is not opened
It splits, obtains the internal rotor of the DC brushless motor of excellent quality.
It should be noted that the mold that step (1) forms elastomer layer (becomes first in following embodiments and comparative example
Mold) and the mold (becoming the second mold in following embodiments and comparative example) that uses of (2) injection molding be all this field routine
Mold, the two can be different mold, be also possible to same mold (for example, bicolor injection mould-single mold can be molded
Two kinds of different materials), those skilled in the art can select as needed in actual operation.Note involved in the present invention
The equipment such as molding machine are also conventional equipment, and this will not be repeated here.
According to the second aspect of the invention, the present invention also provides a kind of DC brushless motor internal rotors, using the present invention
The method of first aspect is prepared.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions.
Embodiment 1
(1) metal shaft is placed in the first mold, the first 60 DEG C of mold temperature, using 230 DEG C of injection temperature, injection speed
Polyethylene is injected on the outside of metal shaft by 100 mm/seconds, 10 seconds cooling, and curing molding forms elastomer on the outside of metal shaft
Layer.
(2) metal shaft of flexible body layer is put into the second mold, the second 80 DEG C of mold temperature, applying axial compressive force makes
0.10 millimeter of the unilateral compression of elastomer layer；Using 275 DEG C of injection temperature, 200 mm/second of injection speed, 6 ferrite of nylon is infused
It penetrates on the outside of elastomer layer, 40 seconds cooling, 6 ferrite of nylon injection molding on the outside of elastomer layer.
(3) injection molding machine pulls open mold, and the pressure of elastomer layer axial direction disappears, and obtains product.Turn in manufactured in the present embodiment
Son such as Fig. 2, wherein a is to throw view, and b is sectional view.
Embodiment 2
(1) axis with folded silicon steel slice is placed in the first mold, the first 80 DEG C of mold temperature, using injection temperature
Nylon 6 is moulded on the outside of metal shaft by 260 DEG C, 150 mm/second of injection speed, 26 seconds cooling, and bullet is formed on the outside of metal shaft
Property body layer.
(2) metal shaft of flexible body layer is put into the second mold, the second 100 DEG C of mold temperature, applies axial compressive force
Make 0.20 millimeter of the unilateral compression of elastomer layer；Using 280 DEG C of injection temperature, 350 mm/second of injection speed, 6 SmCo of nylon is infused
It penetrates on the outside of elastomer layer, 40 seconds cooling, 6 SmCo of nylon injection molding on the outside of elastomer layer.
(3) injection molding machine pulls open mold, and the pressure of elastomer layer axial direction disappears, and obtains product.Turn in manufactured in the present embodiment
Son such as Fig. 3, wherein a is to throw view, and b is sectional view.
Embodiment 3
(1) metal shaft is placed in the first mold, the first 70 DEG C of mold temperature, using 230 DEG C of injection temperature, injection speed
90 mm/seconds, 15 seconds cooling by polypropylene syringe on the outside of metal shaft, curing molding forms elastomer layer on the outside of metal shaft.
(2) metal shaft of flexible body layer is put into the second mold, the second 110 DEG C of mold temperature, applies axial compressive force
Make 1.50 millimeters of the unilateral compression of elastomer layer；Using 280 DEG C of injection temperature, 400 mm/second of injection speed, by 6 alnico of nylon
It is injected on the outside of elastomer layer, 40 seconds cooling, 6 alnico of nylon injection molding on the outside of elastomer layer.
(3) injection molding machine pulls open mold, and the pressure of elastomer layer axial direction disappears, and obtains product.
Embodiment 4
(1) metal shaft is placed in the first mold, the first 90 DEG C of mold temperature, using 270 DEG C of injection temperature, injection speed
PA6 is moulded on the outside of metal shaft by 80 mm/seconds, 24 seconds cooling, and elastomer layer is formed on the outside of metal shaft.
(2) metal shaft of flexible body layer is put into the second mold, the second 110 DEG C of mold temperature, applies axial compressive force
Make 0.15 millimeter of the unilateral compression of elastomer layer；Using 280 DEG C of injection temperature, 250 mm/second of injection speed, by 6 ferrite of nylon
It is injected on the outside of elastomer layer, 40 seconds cooling, 6 ferrite of nylon injection molding on the outside of elastomer layer.
(3) injection molding machine pulls open mold, and the pressure of elastomer layer axial direction disappears, and obtains product.
Comparative example 1
(1) metal shaft is placed in the first mold, the first 80 DEG C of mold temperature, using 240 DEG C of injection temperature, injection speed
Nylon 6 is moulded on the outside of metal shaft by 80 mm/seconds, 10 seconds cooling, and elastomer layer is formed on the outside of metal shaft.
(2) metal shaft of flexible body layer is put into the second mold, the second 80 DEG C of mold temperature, using injection temperature
6 strontium ferrite of nylon is injected on the outside of elastomer layer by 265 DEG C, 60 mm/second of injection speed, 10 seconds cooling, and nylon 6 bonds
Strontium ferrite injection molding on the outside of elastomer layer.
(3) injection molding machine pulls open mold, obtains product.
Comparative example 2
(1) metal shaft is placed in the first mold, the first 100 DEG C of mold temperature, using 240 DEG C of injection temperature, injection speed
80 mm/seconds are spent, nylon 6 is moulded on the outside of metal shaft, it is 7 seconds cooling, elastomer layer is formed on the outside of metal shaft.
(2) metal shaft of flexible body layer is put into the second mold, the second 100 DEG C of mold temperature, using injection temperature
The bonding SmCo of nylon 6 is injected on the outside of elastomer layer by 270 DEG C, 60 mm/second of injection speed, and 10 seconds cooling, nylon 6 bonds
SmCo injection molding on the outside of elastomer layer.
(3) injection molding machine pulls open mold, obtains product.
Performance measurement
30 identical products are prepared in embodiment 1-4 and comparative example 1-2 respectively, it is then that each set product is 1 week cooling
After be put into thermal shock test case, make uninterruptedly touring thermal expansion in 1 hour of each cycle (- 20 140 degree of degree 30 minutes 30 minutes)
Shrinkage impact experiment.There is 1 cracking in 30 products of comparative example 1 at the 5th period, has 3 in 30 products of comparative example 2
A cracking；There are 6 crackings in 30 products of comparative example 1 at the 10th period, there are 8 to open in 30 products of comparative example 2
It splits.And each set product of embodiment 1-4 within 10 periods without generate cracking phenomena.
Claims (12)
1. a kind of preparation method of motor internal rotor, which comprises the steps of:
(1) elastomer machine-shaping is formed into elastomer layer on the outside of hardware；
(2) applying axial compressive force to the elastomer layer that step (1) is formed keeps elastomer layer both ends axially compressed, to make bullet
Property body layer radial direction radiant type expand, then by 6 magnetic material injection molding of nylon on the outside of elastomer layer；
(3) it releases stress to obtain finished product；
Wherein, the 6 magnetic material of nylon is obtained by mixing using nylon 6 as basis material and magnetic powder.
2. preparation method according to claim 1, which is characterized in that the elastomer is thermosetting material or thermoplasticity
Material.
3. preparation method according to claim 2, which is characterized in that the thermosetting material is rubber, EVA resin or ring
Oxygen resin, the thermoplastic material are polypropylene, polyethylene, ABS, PVC, PS, PBT, PPO, POM, PC or nylon.
4. preparation method according to claim 1, which is characterized in that the hardware is metal shaft, or is had
The axis of folded silicon steel slice or metallic sheath.
5. preparation method according to claim 1, which is characterized in that in step (2), apply axial pressure to elastomer layer
Power makes elastomer layer both ends along axial unilateral compression 0.001-5.000 millimeters.
6. preparation method according to claim 5, which is characterized in that elastomer layer both ends are along axial unilateral compression 0.01-
3.00 millimeter.
7. preparation method according to claim 6, which is characterized in that elastomer layer both ends are along axial unilateral compression 0.03-
0.50 millimeter.
8. preparation method according to claim 7, which is characterized in that elastomer layer both ends are along axial unilateral compression 0.05-
0.20 millimeter.
9. preparation method according to claim 1, which is characterized in that the magnetic powder is ferromagnetic oxide powder, samarium-cobalt magnetic powder, neodymium
Any one or more in iron boron magnetic powder, alnico magnetic powder and samarium iron nitrogen magnetic powder.
10. preparation method according to claim 1, which is characterized in that in step (1), according to injection temperature 140-380
DEG C, -1000 mm/second of 20 mm/second of injection speed elastomer is injected on the outside of hardware, it is then 5-180 seconds cooling.
11. preparation method according to claim 1, which is characterized in that in step (2), according to injection temperature 190-310
DEG C, -1000 mm/second of 20 mm/second of injection speed 6 magnetic material of nylon is injected on the outside of elastomer layer, then cool down 5-190
Second.
12. the motor internal rotor that the described in any item preparation methods of claim 1-11 are prepared.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710089260.4A CN107332404B (en) | 2017-02-20 | 2017-02-20 | The preparation method of motor internal rotor and the motor internal rotor prepared by this method |
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|---|---|---|---|
| CN201710089260.4A CN107332404B (en) | 2017-02-20 | 2017-02-20 | The preparation method of motor internal rotor and the motor internal rotor prepared by this method |
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| CN107332404B true CN107332404B (en) | 2019-02-01 |
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| CN109245358A (en) * | 2018-09-28 | 2019-01-18 | 福州小神龙表业技术研发有限公司 | A kind of timepiece movement rotor and its manufacturing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324812A (en) * | 2011-06-30 | 2012-01-18 | 青岛科技大学 | Preparation method with plastic bonding magnet p-m rotor of resilient coating |
| CN105305680A (en) * | 2014-06-16 | 2016-02-03 | 发那科株式会社 | Rotor member, rotor, rotary motor and method for disassembling rotor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6173307A (en) * | 1984-09-18 | 1986-04-15 | Hitachi Metals Ltd | Magnet roll |
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2017
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324812A (en) * | 2011-06-30 | 2012-01-18 | 青岛科技大学 | Preparation method with plastic bonding magnet p-m rotor of resilient coating |
| CN105305680A (en) * | 2014-06-16 | 2016-02-03 | 发那科株式会社 | Rotor member, rotor, rotary motor and method for disassembling rotor |
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