Relative Permeability Of Steel Laminations

The magnetic properties namely the iron losses and the relative permeability of sife electrical steel laminations after mechanical and laser cutting are studied.

Relative permeability of steel laminations. The magnetic measurements are conducted on the epstein frame for frequencies of 50 100 and 200 hz. Both are non oriented steel grades. Cartech hymu 80 alloy is a nonoriented 80 nickel iron molybdenum alloy with extremely high initial permeability and maximum permeability with minimum hysteresis loss. Small hysteresis area resulting in low power loss per cycle low core loss and high permeability.

Electrical steel lamination steel silicon electrical steel silicon steel relay steel transformer steel is a special steel tailored to produce specific magnetic properties. The corresponding degradation for laser cut laminations is 65 iron loss density increase and 65 per meability drop. It has been used primarily for transformer cores magnetic shielding ground fault circuit interrupters tape wound toroids and laminations operating at very low magnetic. Small hysteresis area resulting in low power loss per cycle low core loss and high permeability.

For transformer applications the flux lies predominantly in the length of the laminations and therefore it is desirable to enhance the permeability in this direction. Material of lower thickness but with the same si content shows lower. This product group consists primarily of 006 029 low carbon and silicon alloy steels. Electrical steel is usually manufactured in cold rolled strips less than 2 mm thick.

More detailed information about these two types of steels can be found in the metals handbook. This is achieved by various hot and cold rolling stages to produce textured sheets known as grain oriented silicon steel with the 001 direction in the length of the lamination. Electrical steel lamination steel silicon electrical steel silicon steel relay steel transformer steel is an iron alloy tailored to produce specific magnetic properties. The qualities of the carlite 3 coating are best maintained or enhanced when stress relief annealing is conducted in an atmosphere that is neutral or slightly oxidizing to iron.

Custom steel laminations represent over 50 of all sko die stampings. Steel cores or laminations can usually be removed from the protective atmosphere at 600 700 f 325 375 c without ill effect. Mechanical cutting with guillotine shears and cutting by means of fiber and co2 lasers are considered. Our high speed tooling offers a low cost alternative to maufacturers with moderate to high volume stamping requirements.

Our average lead times on new tooling range from 10 12 weeks. Laminations mechanical cutting causes up to 35 higher iron loss density and 63 lower permeability compared to standard epstein strips 30 mm wide.