Injection molding uses a solid binder (e.g. a plastic or thermosetting epoxy) plus the magnetic materials but gives a greater variety of shapes and complexity of shapes compared to compression bonded. Isotropic material– the magnetized coil fixture design determines the magnetic material it takes.
Over molding magnet is possible with injection molding process.
Injection molded magnets are produced in tens or hundreds of thousands of magnets per production run.
More complex shapes are possible
Overmold, insert mold, etc all possible
NdFeB, SmCo, Alnico and Ferrite magnetic material possible
Hybrid versions as well (e.g. Ferrite+NdFeB) with combined properties
Low electrical conductivity, low eddy currents
Good tolerances. More resistant to chipping than compression bonded
Injection molded magnets offer lower magnetic performance than the compression bonded magnets (due to lower magnetic loading)
Possible tooling charges for production and magnetizing
Applications of Injection Molded Magnet
- Injection molded rotor assemblies
- Insert molded magnetic components
- Overmolding magnetic components
- Medical pump magnet