Injection bonded magnets offer a combination of high magnetic strength and excellent physical properties. They offer large scale manufacture of shaped parts of close dimensional and magnetic tolerances. As smaller more efficient designs are therefore available then with increased design freedom lower losses of magnetism can be achieved.

Typical tolerances will depend largely on the part configuration and the type of tooling selected. Designers can consider standard tolerances of ±0.075mm. Tighter tolerances are available on request. Different binders are available including Nylon 6, 12, EEA and PPS. The material for any specification is chosen based on many factors for example temperature, strength, water absorption, solvent resistance, complexity of shape and compatibility with the magnet power.

The injection moulding process allows for moulding directly on, in or over other components thereby reducing secondary processing costs. This is called insert or overmoulding. Injection moulded magnets can be produced from very simple forms to quite complex arrangements in sizes up to 100gms. Further processing is rarely required but if necessary this can be achieved using conventional tools.

Typical Applications

Magnet stators for fractional horsepower D.C. motors.

Multi-pole magnetic motors for brushless D.C. and stepper motors.

Magnetic actuators for magnetic switches and solenoids.

Sensors for activators and industrial applications.

Material Characteristics of Bonded Ferrite Magnets