Nikkindenji Kogyo

Technical information

    Core Loss (Iron Loss)

Iron loss is the electrical energy loss which is lost in the condition of alternate-current magnetization. The hysteresys loss which occurs when changing the magnetic domain direction and eddy current loss which occurs due to eddy currents constitute iron loss.

Compared with conventional thick electrical steels, ultra-thin-gauge electrical steel strips have very low core losses because of very small eddy current occurrence. The advantages of ultra-thin-gauge electrical steel strips is apparent at high frequencies, and they assist in energy saving and down-sizing high-frequency reactors, transformers, and motors.

    Saturated Flux Density and Permeability

Saturated flux density is defined as the flux density of magnetic material where no further magnetization is possible (magnetizing is saturated).

Permeability is the degree of magnetization of a material in response to a magnetic field. It is repesented by the gradient μ of the relation between the intensity of magnetic field H and the flux density of the material B (B=μH).

Thin-gauge electrical steel strips contribute to downsizing of high frequency reactors and transformers due to high saturation flux density. Thin-gauge electrical steel strips have high permeability, which allows use in shields.

    Oriented electrical steel strip

Oriented electrical steel strip has crystalline orientations which can be easily magnetized (<001>direction) in the rolling direction. It is mainly applied to transformers and wound cores.

    Non-oriented electrical steel strip

Non-oriented electrical steel strip has crystalline orientation which is oriented randomly in the plane. It is used for applications of which the magnetized direction is not limited to a certain direction. It is applied to motor cores.

    Insulation coating

Insulation coating coated on the surface of electrical steel strips restrains short circuit between each layer and prevents eddy currents occurance. Therefore high insulation property and high strength against stacking load are needed for the good insulation coating.