| 摘要 |
PURPOSE:To restrain the generation of noise due to magnetic lines of force, by a method wherein respective surfaces of a magnet and an exciting coil, excluding the opposing surfaces of each parts, are covered by a magnetic material to prevent the magnetic lines of force from the magnet and the exciting coil from releasing to the outside of a motor. CONSTITUTION:A rotor 4 is constituted of a rotor main body 5 and annular magnet 6 while the magnet 6 is attached to the outer periphery of the rotor main body 5 through an annular upper fixing member 8, consisting of a magnetic material. On the other hand, an annular lower fixing member 9, consisting of the magnetic material, is fixed to a position opposing to the upper fixing member 8 of the bottom surface of a storing case 1, formed by the magnetic material, while an exciting coil 10 is arranged in the lower fixing member 9. A fan motor is constituted of the rotor 4, stored in the storing case 1 rotatably, and the storing case 1, however, respective surfaces excluding the mutual opposing surfaces of the magnet 6 and the exciting coil 10 are covered by the magnetic materials, therefore, releasing of magnetic lines of force to the outside of the motor may be prevented and the generation of noise may be restrained. |
