| 摘要 |
PURPOSE:To enable to reduce the weight, thickness, length of a DC motor by forming a hole which is coaxial with a hole formed at the center of a circular magnet rotor and has larger diameter at a magnetic flat plate, thereby improving the generated torque. CONSTITUTION:A rotational shaft 3 which is formed of a back yoke 8 and a disc-shaped magnet 9 bonded to the yoke 8 is mounted on a rotational shaft 1. A stator flat plate 15 which is formed of a magnetic material formed with a hole 13 coaxial with the rotating center at the center and larger than the hole 11 of a disc-shaped magnet 9 in diameter is provided oppositely to the rotor 3. Thus, the magnetic flux density is concentrated to the radial outside to increase the generated torque. |
