Patent ID: 8258912

Claim:
A three-phase three-leg wound iron core comprising: an inner iron core having two wound iron cores, and an outer iron core having one wound iron core; wherein each wound iron core is formed such that at least one wound iron core of a U-leg, a V-leg and a W-leg comprises a first magnetic steel sheet disposed on an inner periphery side and a second magnetic steel sheet disposed on an outer periphery side, the first magnetic steel sheet having a magnetic characteristic inferior to that of the second magnetic steel sheet, and the second magnetic steel sheet having a magnetic characteristic superior to that of the first steel sheet, such that said at least one wound iron core of a U-leg, a V-leg and a W-leg comprises a combination of magnetic steel sheets of different magnetic characteristics; and wherein each of the inner iron core and outer iron core is formed such that a magnetic material having an inferior magnetic characteristic accounts for 50% or less of the total lamination thickness of said at least one wound iron core.