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SEI magnetic material offers 140MPa bending strength

Posted: 04 Feb 2002 ?? ?Print Version ?Bookmark and Share

Keywords:sumitomo electrical industries? sumitomo? sei? magnetic material? actuator material?

Sumitomo Electric Industries Ltd has developed a soft magnetic material that features a three-point bending strength of 140MPa at 2000Csaid to be ten times that of conventional sintered soft magnetic material. The new material is designed for use in high-performance actuators and high-speed rotary motors.

Conventional soft magnetic materials used for applications at 1kHz to 2kHz or higher experience core losses due to heat caused by eddy current. The company claims that the new material has better magnetic properties at high frequencies and is highly heat-resistant.

The material is made from fine magnetic iron powder "several tens of microns" in diameter. These are then coated with an insulating layer "several hundreds of nanometers" thick. An ultra-trace volume of heat-resistant binder is added to the powder and then compressed into a solid to create the material.

The insulating layer on the surface of the iron powder reduces core loss to improve magnetic properties at high frequencies. The material has magnetic flux density of 1.6T at a magnetic field strength of 993.89A/ma 20 to 30 percent improvement compared to conventional sintered soft magnetic material, the company said.

With the compression of magnetic powders, the material can be pulverized at a lower cost for recovery of coiled copper wires and iron motor cores during recycling.

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