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Magnetic materials are very wide range functional materials. It can be simply classified by some basic function :
 1. Through the magnetic power for attractive, push as a permanent magnet
2. The “magnet core” used as a electric wave filter to avoid leakage. Earth Magnets is now producing all permanent magnetic materials. There are existing four types of magnetic materials for selection, according to the magnetic power from weak to strong is ferrite magnet, AlNiCo magnet, SmCo magnet and NdFeB magnet.
And from this 4 materials can classified into the bonded and sintered type production methods, commonly, and under the magnetic material conditions, the sintered magnets have greater magnetic power than the bonded magnets. But the variation of the flexibility and the precision, the bonded magnetic will be at more advantage.
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Material:  |
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Samarium Cobalt |
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Sintered ferrite |
Sintered NdFeB |
Sintered SmCo |
Sintered AlNiCo |
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Compression NdFeB |
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Injection bonded ferrite |
Injection bonded NdFeB |
Injection bonded SmCo |
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Rubber magnet |
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Rubber magnet |
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It is most commonly used in magnet application. The price is cheap, the materials are hard, crisp, the surface is dark grey. It has circle shape, circular shape, square shape, etc. It can be selective for the premiums products, magnet clips, toys, micro motors, loudspeakers.
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The property is very similar to the rubber, the magnet is weak, can fold, can roll, can cut by scissors, the materials are dark brown, the surface can be laminated with PVC or double side adhesive tape.
The width can be reached to 1000mm and 30.5mm long, the thickness can be increased to 0.4mm to 5mm. The best product can be increased to the direct motor fan, refrigerator, photo frame, magnetic calendar, book marks, telephone index etc.
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Since the sintered magnetic materials are hard and crisp. Therefore, the process and assembly cost is relatively high, especially the thin, different shape of product. The loss rate is relatively high, therefore, the Injection bonded magnet is very popular accepted by the brushless motor customers.
This is due to the fact that the magnetic power is high, the shape can be flexible, the successful rate for the finished goods are high, it no needs the after process, it can be applied in the stepper motor, brushless motor, water pump sensors, laser printer’s magnetic roller etc.
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It is the earliest technological magnetic materials. It can be used in the very high temperature under and near the 500 degree. After the process, the surface will be changed into the steel color. It can be the circle shape, cylinder shape, square shape, horse foot shape etc. It is most suitable in instruments, measurers and high temperature environmental electrical products. |
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One kind of rare earth magnet, the materials are very crisp. But the temperature property is high, the magnetic power is high, it therefore can be used under the 400 degree. If it produced by injection bonded that the disadvantage of crisp and difficult to process can be changed. It can be the circle shape, circular type, square type, etc.
It has various sizes for selection and it can be suitable to mainly high technology, high temperatures, such as the aerosol instruments, the core of watches and many precision automated machines, etc. |
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highest magnetic power as the permanent Magnets, Although it is easy broken, but not crisp as SmCo Magnet, the operating temperature lower than SmCo Magnet, under the normal room temperature will oxidize, therefore, the surface need to be electroplated. Circle shape, ring shape, square shape, there are various sizes for selection.
The consumption rate of NdFeB magnet in the market is huge. Suitable product mainly for the hard disk driving motors in computers, CD-Rom driving motors, mini-speakers, etc. Now, NdFeB magnet for the other markets are also increasing, included the toys and accessories etc.
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The new development Rare Earth Magnet materials, the main production methods are compressive and injection. The weight is light, high magnetic power, precision sizes, used in micro-motors, is also the best rotor products in Earth Magnets.
There are many car motors, vibrating motor in mobile, high speed micro motors are also be used.
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| The above four materials, every magnets are classified into different model numbers, you can assess more detail in the <<Product>>
at our web-site. |
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