Compression molded magnet is mainly composed of isotropic NdFeB powder and thermosetting binder. Compression molded magnet needs to process epoxy resin coating by electrophoresis or spraying to obtain excellent corrosion resistance. Compression molded magnet has relatively higher powder filling ratio and magnetic properties in comparison with injection molded magnet, therefore, it is able to replace sintered ferrite magnet and sintered Neodymium magnet in some applications. Unlike injection molded magnet, compression molded magnet is more adapted to regular shape and low mechanical strength requirements. As isotropic magnet, compression molded magnet can freely select magnetization direction. The most representative application of compression molded magnet is the thin-wall ring magnet. Thin wall magnet can be widely served for variety of stepper motors and brushless direct current (BLDC) motors after multi-pole magnetized.
Manufacturing Process of Compression Molded Magnet
Magnetic Properties of Compression Molded Magnet
Grade | Remanence Br | Coercivity Hcb | Intrinsic Coercivity Hcj | Max. Energy Product (BH)max | Max. Operating Temperature Tw | Temp. Coefficient Of Br | Density ρ | ||||
mT | kGs | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | ℃ | %/℃ | g/cm3 | |
BN-2 | 300-400 | 3.0-4.0 | 240-320 | 3.0-4.0 | 480-640 | 6.0-8.0 | 24-32 | 3.0-4.0 | 160 | -0.11 | 4.5-5.0 |
BN-4 | 400-500 | 4.0-5.0 | 240-320 | 3.0-4.0 | 560-720 | 7.0-9.0 | 32-48 | 4.0-6.0 | 160 | -0.11 | 5.0-5.5 |
BN-6 | 500-600 | 5.0-6.0 | 320-400 | 4.0-5.0 | 560-720 | 7.0-9.0 | 48-60 | 6.0-7.5 | 160 | -0.11 | 5.5-5.8 |
BN-8 | 600-680 | 6.0-6.8 | 360-440 | 4.5-5.5 | 640-800 | 8.0-10.0 | 60-72 | 7.5-9.0 | 160 | -0.11 | 5.8-6.0 |
BN-8L | 600-680 | 6.0-6.8 | 400-480 | 5.0-6.0 | 640-800 | 8.0-10.0 | 64-72 | 8.0-9.0 | 160 | -0.11 | 5.8-6.1 |
BN-8H | 600-660 | 6.0-6.6 | 400-480 | 5.0-6.0 | 1040-1360 | 13.0-17.0 | 64-72 | 8.0-9.0 | 180 | -0.10 | 5.8-6.1 |
BN-8SR | 620-680 | 6.2-6.8 | 400-480 | 5.0-6.0 | 800-1120 | 10.0-14.0 | 68-76 | 8.5-9.5 | 180 | -0.10 | 5.8-6.1 |
BN-10 | 680-730 | 6.8-7.3 | 400-480 | 5.0-6.0 | 640-800 | 8.0-10.0 | 76-84 | 9.5-10.5 | 160 | -0.10 | 5.8-6.1 |
BN-10H | 700-750 | 7.0-7.5 | 440-520 | 5.5-6.5 | 720-840 | 9.0-10.5 | 80-88 | 10.0-11.0 | 160 | -0.10 | 6.0-6.3 |
BN-12 | 720-770 | 7.2-7.7 | 440-520 | 5.5-6.5 | 720-800 | 9.0-10.0 | 88-96 | 10.0-12.0 | 160 | -0.10 | 6.0-6.3 |
BN-12H | 740-800 | 7.4-8.0 | 440-520 | 5.5-6.5 | 760-880 | 9.5-11.0 | 88-96 | 11.0-12.0 | 160 | -0.10 | 6.1-6.4 |
BN-12L | 760-810 | 7.6-8.1 | 400-480 | 5.0-6.0 | 480-640 | 6.0-8.0 | 88-96 | 11.0-12.0 | 150 | -0.12 | 6.0-6.3 |
BN-13L | 780-830 | 7.8-8.3 | 400-480 | 5.0-6.0 | 480-640 | 6.0-8.0 | 88-104 | 11.0-13.0 | 150 | -0.12 | 6.1-6.4 |
|