Bonded magnet introduction
Bonded magnet materials can be created through Injection Molded and can be made from NdFeB, Strontium Ferrite or a combination of the two. Bonded magnet?that are created through injection molding can be molded into complex shapes and also molded directly onto components. Bonded magnet?can also be created through the process of compression bonding which offer higher magnetic output but are limited to simpler geometries than Injection Molded materials. Using?certain permanent magnet properties of bonded magnet?powder and binder mixed, according to a certain molding process made of a magnet.
Injection Molding magnet:
- Binder Types / Nylon / PPS / Polyamide(polymide).
- Temperature Range -40c – 180c
- Very Tight tolerances off tool ( 0.002 -0.003 Typical )
- Very good mechanical strength
Compression Bonded magnet:
- Higher Magnetic Strength due to higher magnetic particle density.
- Epoxy Binder / Resistant to normal industrial solvents and automotive fluids
- Epoxy Coat after manufacturing to prevent oxidation
- Temperature Range -40c – 165c
- “Tight” tolerances off tool
- Good mechanical strength
Bonded magnet specification:
Magnetic Characteristics | 1009 | 0813 | |
Residual Induction Br |
(G) | 6800 | 6350 |
(mT) | 680 | 635 | |
? | ? | ? | ? |
Coercive Force Hc | (Oe) | 5800 | 5600 |
(kA/m) | 460 | 440 | |
? | ? | ? | ? |
Intrinsic Coercive Force Hcl | (kOe)Minimum | 9100 | 13900 |
?(kA/m) | ?720 | ?1100 | |
? | ? | ? | ? |
Maximum Energy Product BHmax | (MGOe) | 10 | 8.8 |
(kJ/m?) | 79 | 70 | |
? | ? | ? | ? |
Magnetic Characteristics | 1009 | 0813 | |
Density | (lbs/in) | 0.213 | 0.213 |
(g/cm) | 5.9 | 5.9 | |
? | ? | ? | ? |
Curie Temperature | °F Nominal | 680 | 878 |
°C Nominal | 360 | 470 | |
? | ? | ? | ? |
Maximum Operating Temperature | °F | 302 | 302 |
°C | 150 | 150 |
Typical Bonded Magnet Applications:
- Sensors
- Brushless DC Motors
Bonded magnet advantage:
- Materials are isotropic and can be magnetized in any direction
- Wide range of existing tool sizes are available in rings, discs and rectangles
- Existed Multi-pole magnetizing fixtures for quick prototyping
- Easily machined
- Existing Multi-pole rings simplify assembly verse arc segment