| 摘要 |
PROBLEM TO BE SOLVED: To obtain a small transformer obtained by eliminating a distortion in a silicon steel sheet wound core by reducing no-load loss and performing annealing at a prescribed high temperature.SOLUTION: A silicon steel sheet wound core 11 obtained by laminating and winding a silicon steel sheet of prescribed width to form the shape of a rectangular ring and eliminating a distortion by performing annealing at a prescribed high temperature, and an amorphous alloy wound core 12 obtained by laminating and winding an amorphous alloy thin belt having almost the same width as the silicon steel sheet to form the shape of a rectangular ring having almost the same shape as the silicon steel sheet wound core 11, performing annealing at a prescribed low temperature to eliminate a distortion and being arranged overlappedly on a width direction side part of the silicon steel sheet core 11 are provided. A composite core 10 having a leg part and a yoke part 10b, a core 30 externally fitted to the leg part of the composite core 10, a secondary winding 42 externally fitted to the core 30, and a primary winding 41 externally fitted to the secondary winding 42 are provided. |
