Patent ID: 7777389

Claim:
A rotating electrical machine comprising a stator and a rotor; said stator comprising a stator core having teeth and slots, and stator windings disposed in said slots, wherein said stator core is made of laminated steel sheets, teeth and slots of said steel sheet are made by etching, the thickness of said steel sheet is between 0.05 mm and 0.30 mm, and said steel sheet contains C being between 0.001% and 0.060% by weight, Mn being between 0.1% and 0.6% by weight, P being 0.03% or less by weight, S being 0.03% or less by weight, Cr being 0.1% or less by weight, Al being 0.8% or less by weight, Si being between 0.5% and 7.0% by weight, Cu being between 0.01% and 0.20% by weight, and the remaining components comprising unavoidable impurities and Fe.