| 摘要 |
<p>PURPOSE:To obtain the smooth rotation of a rotor by interposing a shielding layer formed by spirally winding densely leads between a plurality of drive coils disposed on a printed board and the rotor. CONSTITUTION:A stator yoke 1 is mounted in a housing 8, and a printed board 3 for a drive circuit in which a plurality of drive coils 2 are mounted is superposed on the yoke. A rotor 5 has an annular magnet 4, which is opposed through a slight interval to the coils 2, and its rotational shaft 6 is rotatably supported. In this case, a shielding layer 9 of a thin copper plate is superposed on the coils 2 between the coils 2 and the rotor 5. The 9 if formed by spirally winding densely insulated leads 10 of circular section in a flat plate shape, and connected with an earth. Thus, the coils 2 and the rotor 5 are shielded therebetween to suppress noises.</p> |
