| 摘要 |
PURPOSE:To prevent the deterioration of iron loss caused by the residual bending stress of corner part of a D-type iron core, by giving previously strain to compensate the residual bending strain at the time of winding process. CONSTITUTION:When an amorphous alloy thin belt 1 is directly wound around the frame of a D-type iron core, or it is formed from the state of a coil type winding to the D-type iron core, the strain to compensate the residual bending strain after annealing is given previously to the corner part 1b of the D-type iron core. After the amorphous alloy thin belt 1 formed in a D-type is annealed, clamping force by pressing plates 2a and 2b is removed. Then the bending strain r is released, and the D-type amorphous alloy thin belt 1 has a corner part 1b with a curvature r being an initially designed value. As the residual bending stress is released, the generation of magnetic domains which act as reluctance against magnetic flux at the corner part 1b can be prevented, so that the deterioration of iron loss caused by the disturbance of magnetic domain in the corner part 1b is improved.
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