| 摘要 |
<p>A motor driven hard disk assembly for a low-profile, hard disk drive, is mounted upon a base structure (5a) of non-magnetic material. The disk motor (10) is a direct current motor having a salient pole stator (11) mounted on concentric annuli (5a3,5a4) on the innerface (5a1) of the base structure (5a5). A disk motor spindle (5a5) projects from the base structure (5a) at the center of the concentric annuli (5a3,5a4). An umbrella shaped disk motor rotor (12), of magnetic flux conducting material, is mounted for rotation on the disk motor spindle (5a) by an axial bearing pair (12b). The base structure (5a) has an annular recess (5a6) about the outer annulus (5a4) of the concentric annuli (5a3,5a4). The disk motor rotor (12) has a peripheral, depending annular rim (12e), projecting into the annular recess (5a6). A ring (12f) of magnetizable material is supported within the umbrella shaped disk motor rotor (12) and is radially spot magnetized in equally circumferentially spaced locations greater in number than the number of salient poles (11b). The ring (12f) encircles the ends of the salient poles (11b) defining radial gaps therewith. A single disk (13) is secured to an annular planar face (12c) concentrically disposed of the motor rotor (12). <IMAGE></p> |
