| 摘要 |
PURPOSE:To prevent deterioration in magnetic characteristics due to a short circuit between adjacent cores by interposing inorganic fine powder, which has electric insulating properties and heat resisting properties, in lamination gaps of laminated cores. CONSTITUTION:Cores formed by press work are stacked and charged in a holder. A liquid which contains dispersed inorganic material fine powder is allowed to permeate gaps of the cores and then a solvent is vaporized to form the inorganic fine powder in the gaps of the stacked cores. Magnetic annealing is performed to remove strain, improving magnetic characteristics. The inorganic magnetic fine powder is durable at high temperatures sufficiently, so adjacent cores are never welded. Further, it has electric insulating properties, no short circuit is caused. As a liquid for carrying the inorganic material fine powder, inorganic solvents such as methanol, ethanol, acetone, methyl acetate, etc., are usable and as the inorganic fine powder, silica, alumina, magnesium, etc., are usable. |
