CN101707420B - Heteropolarity sintered ferrite rotor magnet of brushless motor - Google Patents
Heteropolarity sintered ferrite rotor magnet of brushless motor Download PDFInfo
- Publication number
- CN101707420B CN101707420B CN2009102342229A CN200910234222A CN101707420B CN 101707420 B CN101707420 B CN 101707420B CN 2009102342229 A CN2009102342229 A CN 2009102342229A CN 200910234222 A CN200910234222 A CN 200910234222A CN 101707420 B CN101707420 B CN 101707420B
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- China
- Prior art keywords
- motor
- rotor magnet
- brushless motor
- magnetite
- sintered ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 9
- 230000005291 magnetic effect Effects 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000000498 ball milling Methods 0.000 claims abstract description 6
- 238000001354 calcination Methods 0.000 claims abstract description 6
- 238000005245 sintering Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 27
- 238000000465 moulding Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 235000020985 whole grains Nutrition 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 4
- 230000005389 magnetism Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000000227 grinding Methods 0.000 description 8
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005292 diamagnetic effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
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- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention discloses a heteropolarity sintered ferrite rotor magnet of a brushless motor, and relates to a rotor magnet of a variable-frequency brushless motor. The production process of the rotor magnet comprises the steps of purchasing calcinations material from north mine; ball milling; wet-type magnetic field alignmenet; drying; size stabilizing; mixing; press forming alignmenet; sintering; appearance processing; magnetism making; checking; packaging; and shipment. The rotor magnet has simple structure and low production and assemble costs, can greatly improve the performance of the motor and prolong the service life of the motor, can lead the rotor to have good precision and extremely good balance, and can improve the degree of freedom of the motor design and stimulate the development of direct current brushless motors.
Description
Technical field:
The present invention relates to a kind of rotor magnetite that is used for the frequency conversion type brushless motor, be specifically related to a kind of Heteropolarity sintered ferrite rotor magnet of brushless motor.
Background technology:
No matter the motor electricity consumption is in family or industry, and its power consumption has all accounted for more than 50% of integral body, so will economize on electricity, at first just must set about from the economize on electricity of motor.Generally using at present more is the AC induction motor, and it has simple in structure, advantages such as the life-span is long, cost is low, easy control, is all used widely at household electrical appliances or other field.But secondary copper loss phenomenon can take place in the rotor-side of AC induction motor, causes energy consumption higher, and vibration is big; Bad phenomenon such as not quiet, and at present, influence the motor of household electrical appliances product consumption electric power; Its high efficiency can't be avoided; So, adopt permanet magnet as motor rotor, the DC Brushless Motor that the secondary copper loss can not take place arises at the historic moment.Its efficient is high, economize the energy, low noise, durability is high, the life-span is long, maintenance problem is few, and because of the formulation of various energy policies; Save the world trends of the energy, high efficiency, household electrical appliances recycle etc., the emphasis that DC Brushless Motor will become exploitation on the market, sell.
Its rotor magnetite of existing DC Brushless Motor mostly adopts the plastics magnetite; And moulding the orientation in addition of magnetic ejection formation with Nd-Fe-B permanent magnetic; The shortcoming that this kind moulded magnetic is: about 90 degree of magnetic energy product low (must in anisotropy strontium based ferrite, add 10% nylon), working temperature (owing to adding relation of nylon), not anti-reverse current thereby cause demagnetize (coercive force is low), the most important thing is can not bearing temperature rapid variation, and the moist environment of soda acid is arranged.Because the various shortcoming of moulding magnetic has restricted the scope of application of DC Brushless Motor and its development.
Summary of the invention:
The purpose of this invention is to provide a kind of Heteropolarity sintered ferrite rotor magnet of brushless motor, it is simple in structure, and the production and assembly cost is few; Can increase substantially motor properties; Prolong the useful life of motor, it makes the rotor precision good, and balance is splendid; And can improve the motor design degree of freedom, promote the development of DC Brushless Motor.
In order to solve the existing problem of background technology, the present invention adopts following technical scheme: its production technology is: buy calcining material → ball milling → wet type magnetic field orientation → drying → whole grain → mixing → press-molding orientation → sintering → outward appearance from Bei Kuang and process → magnetic → check → packing → shipment.
The content of ball mill is in the described ball-milling technology: 5-8 μ m calcining raw materials 1-2 ton, steel ball 8-10 ton, water 1.5-2 ton and additive, and milling time is 15-17 hour, grinding the back particle diameter is 0.8-0,85%.
Described additive is CaCO
31.35%, SiO
20.2%, Al
2O
30.4%, H
3P
2O
30.4%.
In the described press-molding allocating process, the magnetic field winding mode of magnetite is that ripple is around formula.
Granularity is 40-60 order/inch in the described whole grain technology.
The present invention is simple in structure, and the production and assembly cost is few, can increase substantially motor properties, prolongs the useful life of motor, and it makes the rotor precision good, and balance is splendid, and can improve the motor design degree of freedom, promotes the development of DC Brushless Motor.
Description of drawings:
Fig. 1 is a structural representation of the present invention.
Embodiment:
With reference to Fig. 1, this embodiment adopts following technical scheme: its production technology is: buy calcining material → ball milling → wet type magnetic field orientation → drying → whole grain → mixing → press-molding orientation → sintering → outward appearance from Bei Kuang and process → magnetic → check → packing → shipment.
The content of ball mill is in the described ball-milling technology: 1.5 tons of 5-8 μ m calcining raw materials, steel ball 9 tons of (8 * 6 tons of 6.5 * 3 tons+Φ of Φ), 1.8 tons in water and additives, and milling time is 16 hours, grinding the back particle diameter is 0.8-0,85%.
Described additive is CaCO
31.35%, SiO
20.2%, Al
2O
30.4%, H
3P
2O
30.4%.
In the described press-molding allocating process, the magnetic field winding mode of magnetite is that ripple is around formula.
Because anisotropy strontium based ferrite orientation face shrinkage is 22%, non-orientation face shrinkage is 13%, and both gaps are so big, when at 1230 ℃ of sintering of high temperature, promptly because of two kinds of different shrinkages, perhaps breaks and produce slight crack.Annular magnetite internal diameter all has axle, causes the attenuation of pan feeding wall thickness, so filler is difficult, and the whole grain of appropriateness is necessary.But particle diameter is the affects magnetic characteristic too, and the granularity that relatively is fit to is 40-60 order/inch.Because through wet type magnetic field orientation and whole grain technology, former shrinkage becomes 17% by 22%, so greatly reduces the gap of orientation face and non-orientation face shrinkage.
In the press-molding allocating process, the winding mode of past traditional handicraft mostly adopts lenticular wire, use then the layer around mode for it.The maximum shortcoming of this mode is that orientation face (magnetic surface) width diminishes, thereby when causing magnetite total magnetic flux step-down, motor dealer to use this magnetite, the motor torque step-down causes torsion not enough.Changing layer into ripple around formula can solve around formula.Since the driver of brushless motor must with rotor magnetite Waveform Matching, and the waveform of rotor magnetite determines in the orientation of the magnetic field of press, and the magnetic field orientation of press determines the core design at die.For the foregoing reasons, must set up the magnetic Circuit Design and the deposit of various iron core orientations.
The magnetism characteristic and the temperature of magnetite are closely bound up, and when temperature was too high, remanent magnetism understands height but coercive force reduces, and just in time opposite when temperature is low, the suitable temperature curve and the temperature hold-time of high-temperature region all must be carried out correct choice.Extremely different side's magnetite orientation face grinds number can influence the magnetic characteristic height, when the too big magnetic characteristic of magnetite external diameter reduces (grinding too many); External diameter is too little, out of roundness not enough (grinding not enough).When the mechanical strength of magnetite decision main shaft combines with magnetite injection moulding easily whether, when insufficient strength, magnetite is prone to break, so the raising of eliminating probability influences quality and efficient.
After coming out, the magnetite sintering can become polygon shape; Be because the big a lot of cause of the non-orientation face of shrinkage ratio of magnetite orientation face, so the rigidity of grinder station, diamond wheel granular size, the pushing speed of magnetite, the number of times of grinding step all must have proper parameters.External diameter directly influences the injection moulding quality with the perpendicularity numerical value of height.The out of roundness of magnetite and axiality, this all depends on the grinding technique of magnetite.Reach certain level when grinding magnetite, can not produce dither noise during the motor running, and can prolong the motor life-span.
Because therefore magnetite must position processing in the orientation of when compacting when magnetic, position processing as using Nd-Fe-B permanent magnetic etc.During the extremely different magnetite of check ring-type, peak value, orientation waveform, total quantity of magnetism number that must test surfaces magnetic number density, receive the specification value of big or small and each size of the demagnetize of foreign current etc.
This embodiment production and assembly cost is few, and outer weekly form magnetic recording level is 1800G, is up to 2000G, has significantly improved motor performance; It is the ring-type magnetite, and intensity is high, runs up and also can not rupture; Increased the useful life and the unfailing performance of motor, external diameter and highly all need pass through grinding technics in it, the rotor precision is good; Balance is splendid, and its number of poles and magnetite waveform all can be made according to requirement of client, have significantly improved the motor design degree of freedom.It is high more than 3% that this embodiment ratio is moulded magnetic efficiency, has very high torque and good diamagnetic effect.
Claims (2)
1. a manufacturing approach that is used for the Heteropolarity sintered ferrite rotor magnet of brushless motor is characterized in that its method step is: buy calcining material → ball milling → wet type magnetic field orientation → drying → whole grain → mixing → press-molding orientation → sintering → outward appearance and process → magnetic → check.
2. the manufacturing approach that is used for the Heteropolarity sintered ferrite rotor magnet of brushless motor according to claim 1 is characterized in that in the described press-molding orientation step, the magnetic field winding mode of magnetite is that ripple is around formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102342229A CN101707420B (en) | 2009-11-17 | 2009-11-17 | Heteropolarity sintered ferrite rotor magnet of brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102342229A CN101707420B (en) | 2009-11-17 | 2009-11-17 | Heteropolarity sintered ferrite rotor magnet of brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101707420A CN101707420A (en) | 2010-05-12 |
| CN101707420B true CN101707420B (en) | 2012-03-07 |
Family
ID=42377620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102342229A Active CN101707420B (en) | 2009-11-17 | 2009-11-17 | Heteropolarity sintered ferrite rotor magnet of brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101707420B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8986568B2 (en) * | 2010-03-31 | 2015-03-24 | Tdk Corporation | Sintered magnet and method for producing the sintered magnet |
-
2009
- 2009-11-17 CN CN2009102342229A patent/CN101707420B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101707420A (en) | 2010-05-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Nantong Wanbao Industry Co., Ltd. Assignor: Nantong Wanbao Magenetite Manufacturing Co., Ltd. Contract record no.: 2012320000157 Denomination of invention: Heteropolarity sintered ferrite rotor magnet of brushless motor License type: Exclusive License Open date: 20100512 Record date: 20120302 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20190315 Address after: 226600 No. 81, Group 7, Youfangtou Village, Chengdong Town, Haian City, Nantong City, Jiangsu Province Patentee after: Chen Changgui Address before: 226600 No. 88 Huanghai West Avenue, Haian Town, Haian County, Jiangsu Province Patentee before: Nantong Wanbao Magenetite Manufacturing Co., Ltd. |
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| TR01 | Transfer of patent right |