Si Steel Sheet Research Articles

APPLICATION OF 6.5% SILICON STEEL SHEET TO INDUCTION MOTOR AND ITS MAGNETIC PROPERTIES

ABSTRACT The practical application of recently developed standpoints 6.5% Si steel sheets in electrical machines is discussed from two standpoints. One is application in high-speed induction motors and the other is inverter-fed induction motors. The latter had good results in reducing noise and economy, and a practical iron core was developed.

電磁鋼・鉄基非晶質合金複合材料の磁気シールド特性

An improved magnetic shielding method using the magnetic shaking technique with a planar mesh coil was used to develop a composite shielding panel consisting of Fe-based amorphous sheets and Si-steel sheets. The mesh coil, sandwiched by the two ferromagnetic materials, creates a two-dimensional shaking field that enhances magnetic shielding. The composite panel, annealed without the application of a field, shows an exceedingly high shielding effectiveness of 470. The fine and circular magnetic domains of Fe-amorphous ribbons annealed without the application of a field contribute to the magnetic shielding effectiveness of alternating fields at high frequencies.

Magnetic shielding by soft magnetic materials in alternating magnetic field

The magnetic shielding effect of an alternating field up to 20 kHz was examined in 3% Si steel sheets and amorphous ribbons. Not only the permeability but also the domain configuration was found to affect the shielding effects. The annealed Fe-based amorphous shield without field showed exceedingly high shielding effectiveness for higher frequencies.

Effect of crystal orientation on the iron loss and magnetostriction in domain refined highly grain oriented Si steel sheets

Iron loss and magnetostriction in domain refined highly grain oriented Si steel sheets were investigated. The degree of grain refining effect on iron loss has been found to be significantly influenced by crystal orientation. This phenomenon is explained by that reappearance of lancet domains during magnetization is strongly influenced by the tilt angle of [001] axis from sheet plane.

Magnetostriction and applications of 6.5% Si steel sheet

6.5% Si steel is widely known as an excellent soft magnetic material because its magnetostriction is nearly zero. The ac magnetic properties and magnetostriction of 6.5% Si steel sheet were evaluated and compared with those of conventional 3% Si steel sheet. From these data, this sheet is considered to be one of the best core materials available for audio frequency transformers. Toroidal and laminated-type transformers were made from both 6.5% steel sheet and grain-oriented Si steel sheet and the iron losses and noise were investigated. The results indicate that it is possible to operate at high induction, which suggests that this size of a transformer can be reduced by using 6.5% Si steel sheet.

Magnetostriction of 6.5% Si Steel Sheets

Technology for the world's first production of 6.5% Si steel sheets in a coil form has been commercially developed. The dc and ac magnetostriction in 6.5% Si steel sheets and the noise in transformers employing such sheets were investigated, comparing the results with figures for conventional 3% Si steel sheets. 6.5% Si steel sheets had extremely small magnetostriction, and were found to be suitable for application in low-noise audio-frequency transformers.

The Effect of Cross Rolling on Texture and Magnetic Properties of Non Oriented Electrical Steels

The texture change due to a change of cold rolling direction and annealing temperature in the production of 0.6% Si steel sheet is described. Cross rolling results in a very strong (001) component, causing soft magnetic properties in a direction at 45 degrees of the rolling direction. The texture governing mechanism of the primary and secondary recrystallization was oriented growth. The influence of texture on magnetic properties could be shown by measuring the directional properties of the sheet. The correlation between hysteresis losses and induction with texture and grain size was quantified.

Texture, Plastic Anisotropy and Earing Behavior in 1.5% Si Steel Sheets

Texture, plastic anisotropy and earing behavior of 1.5%Si steels which have high strength and good elongation were studied. In the case of slow heating to intercritical temperature, (222) plane slowly increased by selective grain growth of retained ferrite to the temperature which occured the grain growth of recystallized ferrite. But in rapid heating selective grain growth of retained ferrite did not occured because grain growth of recrystallized ferrite was interfered by austenite. And in slow heating and slow cooling, transformation also occured by selective grain growth of retained ferrite. The effect of second phase on plastic strain ratio in multi-phase steel was calculated using Eshelby's tensor. As the difference of plastic strain ratio between matrix and second phase and the volume fraction of second phase increased, R-value of multi-phase steel decreased. On the contrary if the second phase was elongated to the thickness direction and the difference of plastic strain ratio between matrix and second phase was small, the plastic strain ratio of multiphase steel increased. Earing appeared at 45° direction in Cu added steel, but earing appeared at 0°, 90° in Cu not added steel.

６．５％けい素鋼板の磁歪特性

Technology for the world's first production of 6.5% Si steel sheets has been commercially developed in coil-form. The DC and AC magnetostriction in 6.5% Si steel sheets and the noise of the transformer made of 6.5% Si steel sheets were investigated in comparison with that of conventional 3% Si steel sheets. 6.5% Si steel sheets showed extremely low magnetostriction and were recognized to be suitable for application to the low noise audio frequency transformer.

AN ENERGY ANALYSIS OF SECONDARY RECRYSTALLIZA-TION IN GRAIN-ORIENTED 3%Si STEEL

During final annealing of the grain-oriented 3%Si steel sheet, the secondary nuclei form in the subsurface layer of the sheet, but their growth modes depend on cold-rolling reduction. According to the growth characters of conventional and high permeability grain-oriented silicon steels, a quantitative relationship among the parameters, such as the diameter of primary grains, inclusion factor and critical size of secondary nuclei, is derived by the energy analysis. The calculated result is consistent with experimental data of previous works.

Building factors of transformer cores made from low loss Si-steel sheets

Grain-oriented silicon steels of various thickness were built into 3-phase stacked cores, and the relationship between the building factor (B.F.) and the material loss was discussed. The loss component proportional to square of frequency (We), and the ratio of We to total loss too, decrease as the thickness of the silicon steel decreases, while the loss component proportional to frequency (Wh) is nearly constant for the high grade silicon steels of various thickness. In the case that silicon steels have same thickness, the B.F. deteriorates with decreasing material loss. But in the case that the thickness varies for high grade steels the B.F. does not change in spite of varying material loss. Using thin silicon steels, the core loss of transformers can be decreased in the same ratio of the material losses.

けい素鋼板の静磁化特性に与える弾性限界内張力の静的または繰返し印加の効果

けい素鋼板の静磁化特性に与える弾性限界内張力の静的または繰返し印加の効果

Iron-Silicon-Aluminum Nonoriented Electrical Sheets

Nonoriented electrical sheets with good ductility and superior magnetic properties can be produced from steel containing Si and Al by processes involving cold reduction and high-speed continuous annealing. A preferred composition, containing between 2% and 3% Si and between 2% and 3% Al has core losses similar to, and permeabilities vastly superior to, those generally associated with AISI M-14 grade sheets. Unlike Si-steel sheets having similar resistivity and total alloy content, these Fe–Si–Al sheets are ductile and can be readily wound and punched. Further advantages of this steel sheet include improved surface finish and flatness, lower specific gravity, a low degree of preferred orientation, and a highly insulating, adherent surface oxide that is developed during the process anneal by action of the annealing atmosphere on the alloying elements in the sheet.

The Effect of Heat-Treatment for Forming Insulating Film on the Magnetic Properties of Si-Steel Sheets

The Effect of Heat-Treatment for Forming Insulating Film on the Magnetic Properties of Si-Steel Sheets

硅素鋼の結晶の成長

硅素鋼の結晶の成長