| 摘要 |
PURPOSE:To lighten the weight of laminated sections except an end section in the axial direction while reducing mechanical loss, and to start a motor easily by forming notches to the steel plates of the laminated sections. CONSTITUTION:The yoke 1a is formed by laminating the torus-shaped steel plates, outer circumferential sections thereof have pigeon tail-shaped grooves 2 connected to a field pole and central sections thereof have inner holes 3 connected to a main shaft. Here, the notches such as cylindrical holes 7 are formed to the steel plates lc of the laminated sections except the steel plate 1b of the end section in the axial direction. Accordingly, the weight G of the yoke 1a is lightened, and a flywheel effect GD<2> is reduced. Since the notch 7 is not formed to the steel plate 1b of the end section in the axial direction, space penetrating in the axial direction is not shaped, thus reducing windage loss. |
