Amorphous Core Annealing Method

Abstract

There is provided an amorphous core annealing method in which the annealing temperature distribution within an iron core is regulated so that deterioration in the magnetic properties, which is caused by unevenness of the annealing temperature within the core, can be suppressed, and the annealing time can be shortened. In order to regulate the annealing temperature distribution within the amorphous core at the annealing time, a heater functioning as a heat source is held between laminated thin-film amorphous materials of an iron core, and annealing is performed. By uniformly regulating the annealing conditions within the core, deterioration in the magnetic properties, which is caused by unevenness of annealing, can be suppressed to a minimum. Also, an iron core of a special specification, for example, a core having a low core loss, or a core having a high magnetroresistance, can be manufactured by using different annealing conditions within the iron core.

1 . An amorphous core annealing method, wherein an iron core is configured by a block-shaped laminated body formed by laminating a plurality of thin sheets of amorphous material, a heat source is held between the adjacent amorphous materials, and annealing is performed by the heat supplied from the heat source. 
     
     
         2 . The amorphous core annealing method according to  claim 1 , wherein the heat source is a heater which consists of a laminated thin sheet consisting of a nonmagnetic body and a plurality of independent coils which are held between the laminated thin sheets and generate heat due to induction overheat. 
     
     
         3 . The amorphous core annealing method according to  claim 2 , wherein the heat source is held between an amorphous material of n-th (n is an integer of 2 or more) layer from the innermost periphery side and an amorphous material of (n+1)th layer. 
     
     
         4 . The amorphous core annealing method according to  claim 2 , wherein the heat source is a substance having a thermal conductivity of 25 W/m·K or higher. 
     
     
         5 . The amorphous core annealing method according to  claim 1 , wherein the heat source is a heat conductive thin sheet consisting of a nonmagnetic body which is heated by an external heating source and transfers heat to the amorphous material. 
     
     
         6 . The amorphous core annealing method according to  claim 5 , wherein the heat source is held between an amorphous material of n-th (n is an integer of 2 or more) layer from the innermost periphery side and an amorphous material of (n+1)th layer. 
     
     
         7 . The amorphous core annealing method according to  claim 5 , wherein the heat source is a substance having a thermal conductivity of 25 W/m·K or higher. 
     
     
         8 . An amorphous core annealing method, wherein a heat source is brought into contact with the lamination end surface of a block-shaped laminated body formed by laminating a plurality of thin sheets of amorphous material, and annealing is performed by the heat supplied from the heat source. 
     
     
         9 . The amorphous core annealing method according to  claim 8 , wherein the heat source is configured so that a portion which is in contact with the lamination end surface of the block-shaped laminated body is formed by a fibre material. 
     
     
         10 . An amorphous core annealing method, wherein an iron core is configured by a block-shaped laminated body formed by laminating a plurality of thin sheets of amorphous material, a first heat source is held between the adjacent amorphous materials, a second heat source is brought into contact with the lamination end surface of the block-shaped laminated body, and annealing is performed by the heat supplied from the first heat source and the second heat source. 
     
     
         11 . The amorphous core annealing method according to  claim 10 , wherein the first heat source is a heater which consists of a laminated thin sheet consisting of a nonmagnetic body and a plurality of independent coils which are held between the laminated thin sheets and generate heat due to induction overheat, and the second heat source is configured so that a portion which is in contact with the lamination end surface of the block-shaped laminated body is formed by a fibre material. 
     
     
         12 . The amorphous core annealing method according to  claim 10 , wherein the first heat source is a heat conductive thin sheet consisting of a nonmagnetic body which is heated by an external heating source and transfers heat to the amorphous material, and the second heat source is configured so that a portion which is in contact with the lamination end surface of the block-shaped laminated body is formed by a fibre material. 
     
     
         13 . An amorphous core annealing method, wherein a block-shaped laminated body is formed by laminating a plurality of thin sheets of amorphous material, an iron core is formed by laminating a plurality of layers of the block-shaped laminated body, the block-shaped laminated body of plural layers is extended in the direction perpendicular to a lamination surface so as to form a plurality of steps, and annealing is performed for every block-shaped laminated body of the plurality of steps. 
     
     
         14 . The amorphous core annealing method according to  claim 13 , wherein a heat source is held between the adjacent amorphous materials in the block-shaped laminated body, and annealing is performed by heat supplied from the heat source. 
     
     
         15 . The amorphous core annealing method according to  claim 14 , wherein the heat source is a heater which consists of a laminated thin sheet consisting of a nonmagnetic body and a plurality of independent coils which are held between the laminated thin sheets and generate heat due to induction overheat. 
     
     
         16 . The amorphous core annealing method according to  claim 14 , wherein the heat source is a heat conductive thin sheet consisting of a nonmagnetic body which is heated by an external heating source and transfers heat to the amorphous material. 
     
     
         17 . The amorphous core annealing method according to  claim 13 , wherein a heat source is brought into contact with the lamination end surface of the block-shaped laminated body, and annealing is performed by the heat supplied from the heat source. 
     
     
         18 . The amorphous core annealing method according to  claim 13 , wherein a first heat source is held between the adjacent amorphous materials laminated in the block-shaped laminated body, a second heat source is brought into contact with the lamination end surface of the block-shaped laminated body, and annealing is performed by the heat supplied from the first heat source and the second heat source.