China Rare Earth Magnet Limited manufactures bonded NdFeB permanent magnets in grade BNP-2，BNP-4，BNP-6, BNP-8L, BNP-8, -8SR, BNP-8H, BNP-9, BNP-10, BNP-11, BNP-11L, BNP-12, which can be coated with back or grey epoxy. Most customers usually require ring magnets made bonded NdFeB material with multi-poles through diameter or radial magnetization. We also customize bonded magnets in arc, block shapes, etc.
Photos of Big Block Magnets & Bonded NdFeB Magnetic Assemblies
Ring Magnets with Multi-poles through Diameter
Magnets magnetized through outer and inner diameter with certain poles (minimum width between poles on outer diameter can be 0.8mm)
It has small tolerance (surface gauss of customized fixture ≦3% )and equally distribution of pole width (tolerance of width between poles ≦3%).
The waveform can be divided into sine wave and square ware. Different waveform is suitable for different applications.
Radially Magnetized
Products with N, S poles concentrically distributed
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Magnetic Characteristic and Physical Properties Of Bonded Neodymium Magnet |
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Grade |
BNI-3 |
BNI-4 |
BNI-5 |
BNI-6 |
BNI-6H |
BNI-7 |
BNI-5SR(PPS) |
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BrT(Gs) |
0.2-0.4 |
0.40-0.46 |
0.45-0.51 |
0.51-0.56 |
0.48-0.56 |
0.54-0.64 |
0.45-0.50 |
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HCBkA/m(kOe) |
120-240(1.5-3.0) |
250-335(3.1-4.2) |
280-360(3.5-4.5) |
295-375(3.7-4.7) |
335-400(4.2-5.0) |
320-400(4.0-5.0) |
300-360 |
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HCJkA/m(kOe) |
480-640(6.0-8.0) |
575-735(7.2-9.2) |
640-800(8-10) |
640-800(8-10) |
1035-1355(13-17) |
640-800(8-10) |
875-1115 |
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(BH)maxkJ/m3(MGOe) |
8-24(1.0-3.0) |
28-36(3.5-4.5) |
37-44(4.6-5.5) |
44-52(5.5-6.5) |
40-52(5.0-6.5) |
51-59(6.5-7.5) |
36-44 |
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Dg/cm3 |
3.9-4.4 |
4.2-4.9 |
4.5-5.0 |
4.7-5.1 |
4.8-5.2 |
5.0-5.5 |
4.9-5.4 |
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μr |
1.2 |
1.2 |
1.2 |
1.13 |
1.13 |
1.13 |
1.13 |
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α（Br）%/℃ |
-0.15 |
-0.13 |
-0.13 |
-0.11 |
-0.15 |
-0.11 |
-0.13 |
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Tw℃ |
100 |
110 |
120 |
120 |
130 |
120 |
150 |
Remark: The characteristics in this table are measured on CREM's standard test samples and not guaranteed values.
Bonded NdFeB VS Sintered NdFeB Magnets
Compared with sintered neodymium permanent magnet material, bonded NdFeB magnet material can be pressured directly to precise dimensional magnets without sintering process and secondary operation, and they can make all kinds of complicated shaped magnets.
Bonded NdFeB VS Isotropic Ferrite Magnet
The emergence of bonded NdFeB material gets rid of the bondage of the low performance isotropic ferrite magnets, promoting and accelerating the design and development of high performance multi poles motors. While all this depends on multi-poles magnetization technique and multi-poles bonded NdFeB ring magnets with magnetization through diameter or axially thickness. Common permanent magnets with multi poles magnetizations are 4 poles, 6 poles, 8 poles or more which depend on the dimensions and the application of the magnets.
Application
Car motor magnets---Steering wheel torque sensor equipped with bonded neodymium magnets, automobile tail gas treatment with bonded NdFeB magnetic components, automotive seat motor with bonded NdFeB magnets, oil pump motor with magnets, automotive oil pump motor with bonded NdFeB magnets, automobile fan motor magnets, automobile sensor magnets
Household appliances magnets---air conditioner motor magnets, vacuum cleaner motor magnets
Office automation magnets
Electric tools magnets
Mobile phone vibration motor magnets
Door control motor magnets
Brushless motor magnets
Other motor magnets - counter magnets, Conveyor belt motor magnets
Other custom made permanent magnetic products according to customers’ actual requirements
