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| Common sense |
1 , How to Order a magnet ?
To enable us to more effectively meet your work , we need you to confirm before placing orders, the following:
( 1 ) , what material , performance?
( 2 ) , dimensions and tolerances ?
( 3 ) , whether to magnetizing ? To magnetization, is the way in which the thickness ? Length ? Width ? Axial ? Radial ?
( 4 ) , the maximum temperature of the working environment magnet ?
( 5 ) , the order quantity ?
( 6 ) , surface treatment ? Zinc, nickel ?
( 7 ) , for special treatment , please inform .
2 , NdFeB magnets which application ?
NdFeB magnet with its excellent performance , abundant raw material and reasonable prices are to the rapid development and wide application . The main applications in micro motors, permanent magnet instrument , electronic industry, automobile industry , petrochemicals, nuclear magnetic resonance devices, sensors , audio equipment , magnetic suspension system, magnetic transmission machine and magnetic devices and so on.
3, the magnetic analog
Ferrite low and medium , the lowest price , good temperature characteristics , corrosion resistance, good cost performance ;
NdFeB highest performance , price , good strength , not high temperature and corrosion ;
SmCo high-performance, highest price , crisp, excellent temperature characteristics , corrosion resistance ;
Alnico low performance and in price , excellent temperature characteristics , corrosion resistance, interference and poor ;
4 , the magnetic properties of NdFeB can last long ?
NdFeB magnets have a very high coercivity , the natural environment and general conditions do not appear demagnetization magnetic field and the magnetic variation . Assuming proper environment , even after prolonged use , the magnets can damage will not be great . Therefore, in practical applications , we tend to ignore the time factor on the magnetic properties .
5, on the direction of orientation
Orientation direction : get the best magnetic anisotropic magnetic direction as the direction of magnetic orientation . Magnets are divided into:
( 1 ) , isotropic magnets : are the same in any direction of the magnet magnetic
( 2 ) , anisotropic magnets : in different directions have different magnetic properties ; , and there is a direction, i.e. alignment direction is oriented in the direction of the resultant magnetic highest magnets. Sintered NdFeB magnets are anisotropic , and thus need to determine the orientation direction of the pre-production ( magnetization direction ) .
6 , the factors that affect the magnetic NdFeB magnets ?
Ambient temperature, because the temperature sintered NdFeB work extremely sensitive to the environment and sustainable instantaneous maximum temperature maximum temperature may be magnets produce different degrees of demagnetization , including reversible and irreversible , recoverable and non-recoverable .
7 , NdFeB magnets operating temperature range is like ?
NdFeB magnet temperature limit triggered a series of research and development level of the magnet to suit different operating temperature requirements, please refer to our catalog compare the performance of each grade magnet operating temperature range. Before selecting NdFeB magnets need to confirm the maximum operating temperature.
8 , how to shield the magnetic field ?
Generally, we use ordinary magnetic iron shield . High permeability magnetic shielding material required to meet this requirement is an iron -nickel alloy material , this material has a high magnetic permeability . When you need to shield the magnetic field is strong, the only single-layer shielding materials, shielding requirements not reach that saturation will occur . At this time , one approach is to increase the thickness of the material . But more effective method is to use a combination shield , a shield body in another shield , leaving an air gap between them . The air gap can be filled with any non- permeability material do support, such as aluminum . Combined shield shielding effectiveness is much higher than a single shield , so combined shield can be attenuated to a very low level magnetic field .
9 , storage and transport magnets What precautions ?
Magnets in storage to keep indoor air dry, or humid environment tends to rust magnet . Ambient temperature does not exceed the maximum operating temperature magnets ; unplated product is stored and can be properly oiled rust ; magnetizing product should be stored away from the disk , magnetic tape , computer monitors , watches and other objects sensitive to magnetic fields . Magnet material more brittle , transportation , plating ( coating ) , the installation process , you should make sure the magnet is not strong shocks, if the method properly, it may cause magnetic damage, crack ; magnet magnetization state should be shielded transport , especially aviation transportation must be completely masked.
10 , the operation of the magnet What precautions ?
Magnets in the course should ensure that the workplace clean, otherwise easily absorbed iron and other magnetic small particles affect the use ; NdFeB material is characterized by a hard and brittle, while its suction up to more than 600 times its own weight , easy to pull collision damage . Procedure for small size should be taken to avoid damage bump , for large size but also to be noted that personal safety and protection.
11 , the coating from the skin causes and what are the reasons appear rust ?
Qualified electroplating products, under normal circumstances , there should not rust plating coating . In too wet , poor air circulation , temperature change is large, even the salt spray test approved product long-term storage in harsh environments are likely to produce rust . When electroplating products stored at ambient harsh environment , the basal layer further react with condensate will cause the basal layer and reduce coating adhesion , can also cause serious localized chalking substrates , thereby naturally from the skin . Electroplating products should not be placed in long-term high humidity , should be placed in a cool, dry place.
12 , how to measure the level of magnetic energy ?
There are three main parameters : remanence Br (Residual Induction), units of Gauss, removed from the saturation magnetic field , the residual magnetic flux density , on behalf of external magnetic field strength can provide ; coercivity Hc (Coercive Force), units Oersteds, is applied to the magnet in a reverse magnetic field , when the external magnetic field is increased to a certain strength of the magnets will disappear, and the ability of the applied magnetic field , the resistance as the coercive represents the measured resistance to demagnetization ; magnetic product BHmax, unit Gauss-Oersteds, is the unit volume of material generated by the magnetic energy , the magnetic energy can be stored a physical quantity .
13 , commonly used in magnetic measurement instruments
The magnetic measurement instruments used are: Fluxmeters , teslameter ( also known as Gauss meter ) , magnetic measuring instrument . Flux meter used to measure the magnetic induction flux , Tesla meter used to measure the surface magnetic field strength or air-gap magnetic field strength , magnetic measuring instrument for measuring the magnetic properties . All instruments should carefully read the instructions before use , according to the requirements of the specification preheated after the operation in accordance with the requirements of the specification .
14 , the processing cost of the magnet factor?
Magnets processing costs mainly by the following factors: performance requirements, batch size , shape specifications , tolerances . Requires higher performance , the higher the cost , such as the N45 N35 magnet price far higher than the price ; smaller quantities , the higher processing costs ; shape more complex , higher processing costs ; more stringent tolerances , higher processing costs .
15 , NdFeB and ferrite performance comparison
From the surface looks much higher than ordinary ferrite , but cost-effective point of measurement unit volume , NdFeB has a significant advantage. Compared with the ordinary ferrite , NdFeB higher energy product nearly 10 times higher than the price of the same specifications of times , such as to produce the same magnetic field , the volume of the NdFeB only one-tenth of the ferrite .
16 commonly used magnetic measurement instruments
The magnetic measurement instruments used are: Fluxmeters , teslameter ( also known as Gauss meter ) , magnetic measuring instrument . Flux meter used to measure the magnetic induction flux , Tesla meter used to measure the surface magnetic field strength or air-gap magnetic field strength , magnetic measuring instrument for measuring the magnetic properties . All instruments should carefully read the instructions before use , according to the requirements of the specification preheated after the operation in accordance with the requirements of the specification . |
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