| 摘要 |
<p>An electric motor used for example in a magnetic disk drive, comprises a rotor 108 having a hub on which the magnetic disk is mounted, and an annular driving permanent magnet, and rotating together with a rotary shaft, and a stator disposed outside the rotor, having a core and coils 106 wound on the core. Part 103b of the outer periphery of the stator core is retracted radially inward or cut away to form a concavity or an open part to permit the magnetic head to enter the space so formed, no coils being present in this area of the core. A magnetic shielding plate 314 may further be provided to cover the coils, with part or the entirety of the magnetic shielding plate being positioned closer to the rotary shaft than the outermost periphery of the rotor to prevent the escape of the rotor in the direction of the rotary shaft. The plate 314 may have side portions 319 which follow the container of the core so as to provide a space for the magnetic head. <IMAGE></p> |
