Method of producing an amorphous transformer for electric power supply
AssigneeHitachi Industrial Equipment Systems Co., Ltd.
InventorsKazuyuki Fukui, Koji Yamashita, Yuichi Ogawa, Masamu Naoe, Yoshihito Yoshizawa
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Abstract
This method of producing an amorphous transformer for electric power supply comprises forming and shaping an iron core by laminating amorphous alloy thin bands and forming a winding, subjecting the iron core, after forming and shaping, to an annealing treatment in which a temperature of a center portion of the iron core during annealing is 300 to 340° C. and a holding time is not less than 0.5 hr, and applying a magnetic field having a strength of not less than 800 A/m to the iron core while subjecting the iron core, after forming and shaping, to the annealing treatment.
Claims20
A method of producing an amorphous transformer for electric power supply, comprising:
- forming and shaping an iron core by laminating amorphous alloy thin bands such that the iron core comprises a lamination of the amorphous alloy thin bands and forming a winding, wherein each of the amorphous alloy thin bands comprises an amorphous alloy comprising an alloy composition expressed by FeaSibBcCd, wherein Fe is iron, Si is silicon, B is boron, and C is carbon, in which 80≦a≦83%, 0<b≦5%, 12≦c≦18%, and 0.01≦d≦3% in atomic % and an unavoidable impurity,
- subjecting the iron core, after forming and shaping, to an annealing treatment in which a temperature of a center portion of the iron core during annealing is 310 to 320° C. and a holding time is 30 to 150 min,
- applying a magnetic field having a strength of 800 A/m to the iron core while subjecting the iron core, after forming and shaping, to the annealing treatment, and
- wherein a fracture strain ε of the iron core is 0.020 or more after subjecting the iron core to the annealing treatment.
A method of producing an amorphous transformer for electric power supply, comprising:
- forming and shaping an iron core by laminating amorphous alloy thin bands such that the iron core comprises a lamination of the amorphous alloy thin bands and forming a winding, wherein each of the amorphous alloy thin bands comprises an amorphous alloy comprising an alloy composition expressed by FeaSibBcCd, wherein Fe is iron, Si is silicon, B is boron, and C is carbon, in which 80≦a≦83%, 0<b≦5%, 12≦c≦18%, and 0.01≦d≦3% in atomic % and an unavoidable impurity,
- subjecting the iron core, after forming and shaping, to an annealing treatment in which a temperature of a center portion of the iron core during annealing is 310 to 330° C. and a holding time is 50 to 70 min,
- applying a magnetic field having a strength of 800 A/m to the iron core while subjecting the iron core, after forming and shaping, to the annealing treatment, and
- wherein a fracture strain ε of the iron core is 0.020 or more after subjecting the iron core to the annealing treatment.
A method of producing an amorphous transformer for electric power supply, comprising:
- forming and shaping an iron core by laminating amorphous alloy thin bands such that the iron core comprises a lamination of the amorphous alloy thin bands and forming a winding, wherein each of the amorphous alloy thin bands comprises an amorphous alloy comprising an alloy composition expressed by FeaSibBcCd, wherein Fe is iron, Si is silicon, B is boron, and C is carbon, in which 80≦a≦83%, 0<b≦5%, 12≦c≦18%, and 0.01≦d≦3% in atomic % and an unavoidable impurity,
- subjecting the iron core, after forming and shaping, to an annealing treatment in which a temperature of a center portion of the iron core during annealing is 300 to 320° C. and a holding time is 60 to 150 min,
- applying a magnetic field having a strength of 800 A/m to the iron core while subjecting the iron core, after forming and shaping, to the annealing treatment, and
- wherein a fracture strain ε of the iron core is 0.020 or more after subjecting the iron core to the annealing treatment.
Dependencies are inferred from the claim text.