Injection molded magnets are magnetic components produced by combining ferrite or neodymium iron boron magnetic powder with engineering plastics using injection molding technology. Utilizing orientation molds made of non-magnetic steel and hard alloys along with adjustable magnetic field forming equipment enables precise magnetic field orientation controlled with 99.9% current accuracy from 0A to 99.9A. These components feature high shape complexity, dimensional accuracy of ±0.05mm, and uniform multi-pole magnetization, making them widely applicable in scenarios such as laser printer magnetic rollers and variable-frequency air conditioner motor rotors.

Material Technology

The process involves mixing ferrite or neodymium iron boron magnetic powder (accounting for 70-90% of composition) with engineering plastics like PA6/PA8/PA12 to create compound pellets. Through improved PA66 substrate formulations, raw material costs have been reduced by 12% while heat deformation temperature has increased to 180°C (per GB1634.2-04 standard). After twin-screw extrusion and pelletizing, the material forms injection-grade pellets with particle sizes ranging from 0.5mm to 1.2mm.

The core manufacturing process includes magnetic field orientation using vertical injection molding machines with non-magnetic steel molds, where magnetic steel connecting plates form closed magnetic circuits. The orientation coils achieve axial/radial multi-pole magnetization with 99.9% current control accuracy. Practical implementations demonstrate that radiation orientation devices can achieve surface magnetic strength of 450mT in samarium iron nitride magnetic rings.

Ningbo Buji Magnetic-Electronic Technology Co., Ltd. maintains core team expertise exceeding twenty years in magnetic materials technology. Primary products include:

1. Injection molded magnets categorized by primary material (neodymium iron boron/ferrite) and binder type (PPS/PA);

2. Bonded pressed neodymium iron boron magnets;

3. Sintered neodymium iron boron magnets;

4. Various magnetic assemblies.
   The company is dedicated to becoming a professional and reliable supplier of magnets and components, delivering cost-effective magnetic application solutions.