Fe-BASED AMORPHOUS TRANSFORMER MAGNETIC CORE, PRODUCTION METHOD THEREFOR, AND TRANSFORMER

Patent metadata

Field	Value
Publication number	US-2016203902-A1
Application number	US-201414911798-A
Country	US
Kind code	A1
Filing date	Aug 7, 2014
Priority date	Aug 13, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present invention provides an Fe-based amorphous transformer magnetic core formed by stacking Fe-based amorphous alloy thin strips and satisfying the following (1) to (3) in a direct current B—H curve measured by applying a magnetic field of 80 A/m to the magnetic core:
B80≧1.1 T   (1)

0.5 T≦Br≦0.7 T   (2)

B80-Br≧0.6 T   (3)

wherein B80 represents a magnetic flux density (T) obtained when magnetization is performed in the magnetic field of 80 A/m, and Br represents a residual magnetic flux density (T) obtained when a magnetic field is changed to 0 A/m after magnetization is performed in a magnetic field of 80 A/m.

First claim

1 . An Fe-based amorphous transformer magnetic core formed by stacking Fe-based amorphous alloy thin strips and satisfying the following (1) to (3) in a direct current B—H curve measured by applying a magnetic field of 80 A/m to the magnetic core:
B80≧1.1 T   (1)

0.5T≦Br≦0.7 T   (2)

B80-Br≧0.6 T   (3)

wherein B80 represents a magnetic flux density (T) obtained when magnetization is performed in the magnetic field of 80 A/m, and Br represents a residual magnetic flux density (T) obtained when a magnetic field is changed to 0 A/m after magnetization is performed in a magnetic field of 80 A/m.

2 . The Fe-based amorphous transformer magnetic core according to claim 1 , wherein an alloy of the Fe-based amorphous alloy thin strips is an alloy comprising 2 atomic percent to 13 atomic percent of Si, 8 atomic percent to 16 atomic percent of B, and not more than 3 atomic percent of C with the balance consisting of Fe and unavoidable impurities.

3 . A transformer comprising:
the Fe-based amorphous transformer magnetic core according to claim 1 ; and at least a pair of conductive wires wound around the Fe-based amorphous transformer magnetic core.

4 . The transformer according to claim 3 for connection to an output side of an inverter.

5 . A method of manufacturing the Fe-based amorphous transformer magnetic core according to claim 1 , comprising:
stacking Fe-based amorphous alloy thin strips to form a layered material; and heat-treating the layered material in a magnetic field of 0 A/m at a holding temperature set to be more than 300° C. but not more than a temperature that is 150° C. less than a crystallization starting temperature of the amorphous alloy for a holding time set to be not less than 1 hour but not more than 6 hours.

6 . A transformer comprising:
the Fe-based amorphous transformer magnetic core according to claim 2 ; and at least a pair of conductive wires wound around the Fe-based amorphous transformer magnetic core.

7 . The transformer according to claim 6 for connection to an output side of an inverter.

8 . A method of manufacturing the Fe-based amorphous transformer magnetic core according to claim 2 , comprising:
stacking Fe-based amorphous alloy thin strips to form a layered material; and heat-treating the layered material in a magnetic field of 0 A/m at a holding temperature set to be more than 300° C. but not more than a temperature that is 150° C. less than a crystallization starting temperature of the amorphous alloy for a holding time set to be not less than 1 hour but not more than 6 hours.

Assignees

• Hitachi Metals Ltd
• Jibu Electric Co Ltd

Inventors

• Azuma Daichi
• Nagata Yuji
• Takahashi Kengo

Classifications

• H01F41/0226 Primary

  from amorphous ribbons · CPC title

• H01F27/25 Primary

  made from strips or ribbons (H01F27/26 takes precedence) · CPC title

• H01F1/15308

  based on Fe/Ni (H01F1/15325 takes precedence) · CPC title