| 摘要 |
PURPOSE:To largely reduce the iron loss of a rotary electric machine core by bending the strand pieces of the core in a laminating direction, then laminating them, and imparting plastic strain due to elongation to core teeth and a yoke, thereby accelerating the crystalline growth. CONSTITUTION:Core strand pieces 1 which form a rotary electric machine core are punched in a desired shape to form toothed part 2 and a yoke 3, the pieces 1 are bent in a laminating direction to form the section in an inverted trapezoidal shape. The section B of the drawing may be formed in a shallow V shape, W shape or circular-arc shape. Required number of core strand pieces 1 are laminated, caulked or welded to be integrated. Then, the laminate is annealed at approx. 800 deg.C. The crystalline growth of the respective pieces 1 which form the laminated core is largely accelerated by annealing due to the presence of plastic strain due to elongation (from A to B). The iron loss of the core can be remarkably reduced, thereby improving the magnetic characteristics. |
