NTN (NTN) has developed the amorphous alloy powder and resin mix through the injection molding process made ??of amorphous core, and for the EV (electric vehicle), HEV (hybrid), solar power generationequipment, power reactors and storage devices such as choke coils and other uses to achieve commercialization. The core itself is developed by a subsidiary of NTN Japan Science and Metallurgical Company, has been used in MRI (magnetic resonance imaging) devices for medical purposes, but for car use also the first time.
Under normal circumstances, the core of the reactor and the choke coil, mostly ferrite such magnetic materials, metal forming process. The reactor is a coil of passive components, set in the input or output of the inverter side AC on the road; choke coil is used to suppress high-frequency current through the electronic components. EV and HEV, such as reactors, and medical devices flow through the choke coil current, the driving frequency is higher, mostly in the harsh conditions, so the ferrite core is more and more unbearable.
To solve this problem, the Japan Science and Metallurgy Ne-Fe-B (NdFeB) amorphous powder mixed with resin from the magnetic material as raw material, using the injection molding process to create a new core.
Ferrite core 70A current flowing through the inductor becomes zero, while the amorphous core, even flow through the 300A current, inductance is also reduced by only 30%. In addition, increased frequency, the inductance of the ferrite core at 300Hz is cut in half, while the amorphous core even if the frequency increases will not drop to 1000kHz. Inductance does not decline, can be effective in reducing the noise of electrical signals.
In addition, due to injection molding, can also be made ??into any shape, coil and large coil of a variety of shapes can be achieved, compared with the ferrite choke coil made ??of, can be mentioned is reduced to about 1 / 8, the lighter weight.
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