MIM Soft Magnetic Parts: High-Efficiency Magnetic Circuit Solutions for EV Motors and Inductors

MIM soft magnetic parts are high-purity alloy components (Fe-Si, Fe-Ni, Fe-Co) formed in one step via metal injection molding, achieving over 97% sintered density. They enable 3D magnetic circuits for EV motors and inductors, reducing assembly parts, flux leakage, and eddy current losses versus lamination stacking.

Soft magnetic materials are the "heart" of motors, inductors, and transformers. Traditional lamination processes can only produce two-dimensional magnetic circuits, while metal injection molding (MIM) allows engineers to design true three-dimensional magnetic circuit structures—exactly what the new generation of high-efficiency motors and power electronics needs most.

MIM soft magnetic parts use high-purity alloy powders such as Fe-Si, Fe-Ni, and Fe-Co as raw materials, formed in a single step through precision molds, and can achieve a sintered density of over 97%. Compared with lamination stamping plus stacking and welding, MIM makes complex magnetic circuits into a single integrated part, greatly reducing the number of assembly components while improving the magnetic circuit filling factor and reducing magnetic flux leakage and eddy current losses.

In EV traction motors, inverter inductors, automotive wireless charging, sensors, and relays, MIM soft magnetic parts can achieve smaller size, higher efficiency, and more consistent batch-to-batch performance. With the advancement of IE4/IE5 high-efficiency motor standards and the rapid growth of new energy vehicles, soft magnetic MIM is becoming one of the fastest-growing high-value-added segments in injection molding.

Precision Tech provides MIM material solutions including Fe-Si, Fe-Ni, Fe-Co, and stainless steel soft magnetic materials, supporting one-stop delivery from magnetic circuit design and mold development to sintering and magnetic performance testing. We welcome sample submissions or inquiries with drawings.

Frequently asked questions

What materials are used for MIM soft magnetic parts?

They use high-purity alloy powders such as Fe-Si, Fe-Ni, and Fe-Co, along with stainless steel soft magnetic materials.

What sintered density can MIM soft magnetic parts achieve?

MIM soft magnetic parts can achieve a sintered density of over 97%.

How do MIM soft magnetic parts compare with lamination stamping?

MIM integrates complex magnetic circuits into a single part, reducing assembly components while improving filling factor and lowering magnetic flux leakage and eddy current losses.