CN1635692A - Application of Nd-Fe-N rubber-plastic magnet to external rotor brushless DC motor - Google Patents
Application of Nd-Fe-N rubber-plastic magnet to external rotor brushless DC motor Download PDFInfo
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- CN1635692A CN1635692A CN 200410091847 CN200410091847A CN1635692A CN 1635692 A CN1635692 A CN 1635692A CN 200410091847 CN200410091847 CN 200410091847 CN 200410091847 A CN200410091847 A CN 200410091847A CN 1635692 A CN1635692 A CN 1635692A
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Abstract
An application of neodymium-iron-nitrogen plastics-rubber magnet in outer rotor brushless dc motor, which contains using neodymium-iron-nitrogen plastics-rubber magnet to replace the bar shape ferrite plastics-rubber magnet, ferrite adhered magnetic ring and neodymium-iron-boron rareearth adhered magnetic ring, wherein the magnetic energy product of neodymium-iron-nitrogen plastics-rubber magnet reaches 5-6MGOe and breaks the limit of current plastics-rubber magnet can not be used in the high grade products of outer rotor brushless dc motor, said invention can be used in manufacturing of strong magnetic field and small inner diameter outer rotor dc motor and totally replaces current ferrite plastics-rubber magnet, ferrite adhered or plastics injected ring magnet and neodymium-iron-boron plastics injected ring magnet.
Description
Technical field
What the present invention relates to is outer rotor brushless DC motor, the especially application of Nd-Fe-N rubber-plastic magnet in outer rotor brushless DC motor.
Technical background
Brshless DC motor is compared with traditional direct current machine, and except keeping the good speed adjusting performance of traditional direct current machine, maximum improvement is exactly to adopt the contactless electron commutation, has cancelled brush and commutator.Thus, on electric machine structure, brshless DC motor is just in time opposite with traditional direct current machine, and its stator is a coil windings, and rotor is a magnet steel.Rotor can be divided into two kinds of inner-rotor-type and external-rotor-types again: wherein the main distinction be exactly stator at the center, it is exactly external-rotor-type that rotor changes around stator; Otherwise stator is in the periphery, and it is exactly inner-rotor-type that rotor changes in stator interior.
Brshless DC motor adopts external-rotor-type that following advantage is arranged: one, can provide bigger moment of inertia, help the low speed stable operation of motor.Two, magnet steel has enough areas that magnetic flux is provided in rotor case.The brake forming of bar shaped rubber-plastic magnet can be adopted, also integrated injection molding can be selected.
The external rotor magnet steel is as selecting the bar shaped rubber-plastic magnet for use, and its advantage is: when performance index were suitable, rubber-plastic magnet was lower than bonding or injection mo(u)lding magnet price; Production technology is simple, need not mould, but magnetizes in the plane; External rotor assembling link is few, can realize motorization assembly; Processing cost is low.Its defective is: have only with bonded ferrite magnetic powder at present and make rubber-plastic magnet; Other is as the contour performance permanent magnetic material of Agglutinate neodymium-iron-boron, or because price is higher or the magnetic powder particle pattern is limit, and also is not used for making the rubber-plastic magnet commodity now.
Bonded ferrite is the lower permanent magnetic material of a kind of magnetic property, it characterizes important indicator---the magnetic energy product E (unit: MGOe) of magnet performance, being 0.6～1.4MGOe only, is magnetic energy product E minimum at present existing several magnetic materials, is 1/8 to 1/10 of Agglutinate neodymium-iron-boron rare earth magnet.Therefore the ferrite rubber magnet only is applicable to and emphasizes low cost, performance is general or passes over little, the small-power brshless DC motor of low side of volume size.
The external rotor magnet steel also can be selected bonding or injection moulding magnet for use, for example: bonding or injection mo(u)lding ferrimagnet, and high performance injection moulding magnetic Nd-Fe-B ring.Though select for use iron oxygen magnet ring magnetic property higher, but still belong to the ferrite material together, still not as the injection moulding magnetic Nd-Fe-B ring than ferrite rubber magnetic.Though injection moulding neodymium iron boron magnetic body performance is high, because of it uses rare earth material, so price is higher, both unit prices differ 6～10 times at present, so magnetic Nd-Fe-B ring can only be used for high-end brushless electric machine product.
The external rotor magnet steel is compared the bar shaped rubber-plastic magnet and is also had following defective as selecting bonding or injection moulding magnet ring for use:
One, bonding or injection moulding magnet ring manufacturing equipment complexity, the processing technology difficulty is big.As: each external rotor magnet steel all will be made the mould of different size specification separately, not as magnetic rubber-plastic strip, can be slit into bar by sanction behind whole the rubber and plastic magnetic sheet calendaring molding and get final product.
Two, for improving the magnet ring performance, need produce anisotropy magnet ring at the magnetic field orientating compacted under.At this moment, bonding press or injection moulding machine must add the magnetic field orientating device, and magnetomotive coil that magnetizes that can produce powerful and stabilizing magnetic field must be arranged, and the magnetic powder particle that is contained in the permanent magnetic material of bonded ferrite or neodymium iron boron fully is orientated.And the machinery calendering effect of rubber-plastic magnet by the rolling type calender just makes the magnetic orientation.As seen the anisotropy manufacturing process of rubber-plastic magnet is simple more than anisotropic bond ferrite or injection moulding magnetic Nd-Fe-B ring processing technology, need not the magnetic field orientating electric device, and processing cost is more cheap.
When three, brushless electric machine assembles, the external rotor magnet steel must magnetize, magnet ring magnetizes and can only select the radial magnetizing mode for use, its coil that magnetizes, the intensity that magnetizes and the number of magnetic poles that magnetizes are subjected to magnet ring internal diameter size spatial limitation, and be equally simple like that, efficient, low-cost less than the plane of the rubber-plastic strip mode that magnetizes.
As seen by above-mentioned, the external rotor magnet steel is to select for use rubber and plastic to mould bar or bonding injection moulding magnet ring all faces low-cost and high performance awkward predicament.
Summary of the invention
The objective of the invention is deficiency, the application of Nd-Fe-N rubber-plastic magnet in outer rotor brushless DC motor is provided at above-mentioned existence.Should be with the defective that can overcome above-mentioned prior art.
The application of Nd-Fe-N rubber-plastic magnet of the present invention in outer rotor brushless DC motor comprises: the bar shaped ferrite rubber magnet, ferrite bonding magnet ring, the NdFeB rear-earth injection moulding magnet ring that substitute existing outer rotor brushless DC motor with Nd-Fe-N rubber-plastic magnet.
Described Nd-Fe-N rubber-plastic magnet by purity be 5～100% neodymium iron nitrogen magnetic and elastomeric material is mixing, the calendering form; The weight proportion of neodymium iron nitrogen magnetic and elastomeric material is: neodymium iron nitrogen magnetic 90～96%, elastomeric material 4～10%.
The granularity of described neodymium iron nitrogen magnetic is: 1～3 μ m.
Described elastomeric material is chloroprene rubber or ethylene propylene rubber or haloflex (CPE) etc.
Because the granularity of neodymium iron nitrogen magnetic is identical with the bonded ferrite magnetic powder granularity, therefore can adopt the manufacturing process of ferrite rubber magnet maturation to make neodymium iron oxygen rubber-plastic magnet fully.And can produce the inferior Nd-Fe-N rubber-plastic magnet series of products of different magnetic property retainings with the ferromagnetic oxide powder mixing and doping.High more its magnetic property of neodymium iron nitrogen magnetic doping ratio is just good more, and the maximum magnetic energy product of Nd-Fe-N rubber-plastic magnet can be accomplished 5～6MGOe at present, and is suitable with the magnetic energy product of injection mo(u)lding NdFeB rear-earth magnet ring.
Its concrete grammar: neodymium iron nitrogen magnetic is carried out abundant mechanical agitation with elastomeric material, mixes and mixing compound, again by drum-type calender rolling orientation repeatedly repeatedly, make the thickness that meets the requirements smooth surface, have and stretch and bulk sheet bonded permanent magnet---the Nd-Fe-N rubber-plastic magnet of ductility.By technological requirement bulk sheet rubber-plastic magnet is cut out then and be slit into the required bar shaped rubber-plastic magnet of external rotor,, constitute external rotor magnet steel parts in the external rotor shell of can packing at last with bar shaped Nd-Fe-N rubber-plastic magnet looped-shaped bending magnet after magnetizing in the plane.
Magnetic property index under the neodymium iron nitrogen magnetic normal temperature is: coercive force is greater than 400KA/m, residual magnetic flux density 0.9～1.2T, maximum magnetic energy product 120～180KJ/m
3(15～22MGe).It has high residual magnetic flux density, high magnetic energy product, strong anti-oxidant and resistance to corrosion; Simultaneously, the rare earth metal neodymium content of neodymium iron nitrogen magnetic lacks than NdFeB rear-earth neodymium metal content, does not contain expensive doped precious metals such as cobalt again, so neodymium iron nitrogen magnetic is compared with NdFeB magnetic powder, its ratio of performance to price is higher.
The application of Nd-Fe-N rubber-plastic magnet of the present invention in outer rotor brushless DC motor has the following advantages and effect:
1, neodymium iron oxygen rubber-plastic magnet has overcome ferrite rubber magnet magnetic energy product defective on the low side, has reached the magnetic energy product 5～6MGOe of neodymium iron boron injection moulding toroidal magnet, has broken through the limitation that existing rubber-plastic magnet can not be used for the high-end product of outer rotor brushless DC motor;
2, Nd-Fe-N rubber-plastic magnet is compared with the neodymium iron boron toroidal magnet, and 1. neodymium iron nitrogen magnetic is lower than NdFeB magnetic powder material price; 2. the calendering formation technology of Nd-Fe-N rubber-plastic magnet is simple than neodymium iron boron toroidal magnet injection molding process; Need not injection forming mold when 3. the neodymium N rubber-plastic magnet is made; 4. must not be equipped with the magnetic field orientating device.So Nd-Fe-N rubber-plastic magnet low cost of manufacture.
3, Nd-Fe-N rubber-plastic magnet is compared with the ferrite toroidal magnet or the neodymium iron boron toroidal magnet of bonding or injection mo(u)lding, 1. magnetizes with the plane owing to Nd-Fe-N rubber-plastic magnet, and is simple and reliable more than the toroidal magnet radial magnetizing; 2. for the high density multipole magnetization, plane magnetizing equipment, frock clamp design easily, manufacture difficulty is little.The assembly cost of Nd-Fe-N rubber-plastic magnet is low than the ferrite toroidal magnet or the neodymium iron boron toroidal magnet of bonding or injection mo(u)lding.
4, Nd-Fe-N rubber-plastic magnet can substitute existing ferrite rubber magnet, ferrite bonding or injection moulding toroidal magnet, neodymium iron boron injection moulding toroidal magnet with its low-cost and high-performance advantage comprehensively.Promote outer rotor brushless DC motor, rely on the Nd-Fe-N rubber-plastic magnet characteristics, improve entire machine design, simplified processing process improves performance index, reduces production costs.
5, because Nd-Fe-N rubber-plastic magnet adopts the plane mode of magnetizing to realize that the many magnetic poles of high density magnetize, Nd-Fe-N rubber-plastic magnet can accomplish that the magnetic pole minimum spacing is 1～2mm.Can realize the manufacturing of high-intensity magnetic field, little internal diameter external rotor direct current machine.
The concrete mode that Nd-Fe-N rubber-plastic magnet of the present invention is used in outer rotor brushless DC motor is provided in detail by following examples.
Embodiment
Embodiment 1: Nd-Fe-N rubber-plastic magnet replaces neodymium iron boron injection moulding toroidal magnet, the application in outer rotor brushless DC motor.
Because the magnetic property index of Nd-Fe-N rubber-plastic magnet and replaced neodymium iron boron injection moulding toroidal magnet is close, select purity 100% neodymium iron nitrogen magnetic 95kg chlorinated polyethylene rubber material 5kg to carry out abundant mechanical agitation, mix and mixing after, again by the repeatedly calendering repeatedly of drum-type calender, roll at last to the one-tenth piece sheet Nd-Fe-N rubber-plastic magnet that meets the requirement of motor magnetic property, be slit into bar shaped by given size sanction, magnetize through the plane and to reach the regulation number of magnetic poles and magnetize after the intensity, bend to annular again, install in the external rotor shell, promptly finished substituting of neodymium iron boron injection moulding toroidal magnet.
Embodiment 2: Nd-Fe-N rubber-plastic magnet replaces ferrite bonding or injection moulding toroidal magnet, the application in outer rotor brushless DC motor.
Because under the equal volume condition, Nd-Fe-N rubber-plastic magnet is bigger than ferrite bonding or injection moulding toroidal magnet power, under same power condition, Nd-Fe-N rubber-plastic magnet is littler than ferrite bonding or injection moulding toroidal magnet volume, therefore, to determine rational overall dimension and magnetic property index according to the global design of outer rotor brushless DC motor.Should not change as motor overall dimension, when cost requirement is very tight, should adjust the content of the neodymium iron nitrogen magnetic in the Nd-Fe-N rubber-plastic magnet, promptly selecting purity for use is 90% neodymium iron nitrogen magnetic 90kg, simultaneously but ferrite doped calcium magnetic or other metal or nonmetallic materials 4kg and chloroprene rubber 6kg's carries out abundant mechanical agitation, mixing and mixing, again by the repeatedly calendering repeatedly of drum-type calender, make and meet the requirement of motor magnetic property, the one-tenth piece sheet Nd-Fe-N rubber-plastic magnet that has lower cost again, be slit into bar shaped by given size sanction, magnetize through the plane and to reach the regulation number of magnetic poles and magnetize after the intensity, bend to annular again, install in the external rotor shell, promptly finished substituting of ferrite bonding or injection moulding toroidal magnet.
Embodiment 3: Nd-Fe-N rubber-plastic magnet directly replaces bar shaped ferrite rubber magnet, the application in outer rotor brushless DC motor.
According to the reason of embodiment 2, selecting purity for use is that 80% neodymium iron nitrogen magnetic 80kg, ferromagnetic oxide powder 12kg stir, mix calendering with ethylene propylene rubber 8kg and make the Nd-Fe-N rubber-plastic magnet that meets outer rotor brushless DC motor.Install in the external rotor shell, promptly finished substituting of bar shaped ferrite rubber magnet.
Claims (8)
1, the application of Nd-Fe-N rubber-plastic magnet in outer rotor brushless DC motor.
2, according to the application of the described Nd-Fe-N rubber-plastic magnet of claim 1 in outer rotor brushless DC motor, it is characterized in that: Nd-Fe-N rubber-plastic magnet replaces the neodymium iron boron injection moulding toroidal magnet in the outer rotor brushless DC motor.
3, according to the application of the described Nd-Fe-N rubber-plastic magnet of claim 1 in outer rotor brushless DC motor, it is characterized in that: Nd-Fe-N rubber-plastic magnet replaces ferrite bonding or the injection moulding toroidal magnet in the outer rotor brushless DC motor.
4, according to the application of the described Nd-Fe-N rubber-plastic magnet of claim 1 in outer rotor brushless DC motor, it is characterized in that: Nd-Fe-N rubber-plastic magnet directly replaces the bar shaped ferrite rubber magnet in the outer rotor brushless DC motor.
5, according to claim 1,2,3,4 application of described Nd-Fe-N rubber-plastic magnet in outer rotor brushless DC motor, it is characterized in that: Nd-Fe-N rubber-plastic magnet by purity be 5～100% neodymium iron nitrogen magnetic and elastomeric material is mixing, the calendering form.
6, according to the application of the described Nd-Fe-N rubber-plastic magnet of claim 5 in outer rotor brushless DC motor, it is characterized in that: the weight proportion of neodymium iron nitrogen magnetic and elastomeric material is: neodymium iron nitrogen magnetic 90～96%, elastomeric material 4～10%.
7, according to the application of the described Nd-Fe-N rubber-plastic magnet of claim 5 in outer rotor brushless DC motor, it is characterized in that: the granularity of neodymium iron nitrogen magnetic is: 1～3 μ m.
8, according to the application of the described Nd-Fe-N rubber-plastic magnet of claim 6 in outer rotor brushless DC motor, it is characterized in that: the granularity of neodymium iron nitrogen magnetic is: 1～3 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410091847 CN1635692A (en) | 2004-12-22 | 2004-12-22 | Application of Nd-Fe-N rubber-plastic magnet to external rotor brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410091847 CN1635692A (en) | 2004-12-22 | 2004-12-22 | Application of Nd-Fe-N rubber-plastic magnet to external rotor brushless DC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1635692A true CN1635692A (en) | 2005-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410091847 Pending CN1635692A (en) | 2004-12-22 | 2004-12-22 | Application of Nd-Fe-N rubber-plastic magnet to external rotor brushless DC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1635692A (en) |
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2004
- 2004-12-22 CN CN 200410091847 patent/CN1635692A/en active Pending
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