Laser heating creates a steep through-thickness temperature gradient to refine magnetic domains while limiting stress that raises noise.
Joint portions placed in flat regions of a laminated wound core help suppress transformer noise while reducing strain.
An elongate clamping structure stiffens the transformer core column, raising resonance frequency to reduce vibration stress and deformation.
Higher stacking factor at key bent portions and compression of steel sheets cut magnetostriction noise and iron loss in wound cores.
Selective compression raises stacking factor at wound-core bends, cutting magnetostriction noise and iron loss while stabilizing the magnetic field.