| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a transformer core having low iron loss and excellent excitation characteristics without causing complicated work or steep rise of manufacturing cost, by controlling the size tolerance and warpage of steel sheet, when laminating directional electromagnetic steel sheets subjected to oblique angle processing as the material of a transformer core.SOLUTION: In a method of manufacturing a transformer core by laminating directional electromagnetic steel sheets subjected to oblique angle processing as the core material, the shape of steel sheet after oblique angle processing satisfies following formulae (1) and (2). (deviation of oblique angle after processing for a design oblique angle (°))≤0.5°-(steel sheet warpage (mm))×0.02(°/mm)...(1). (deviation of long side length after processing for a design long side length (mm))≤(bonding part lap margin (mm))×0.1-(steel sheet warpage (mm))×0.05...(2). |
