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