| 摘要 |
A rotary actuator for a magnetic disk drive includes an abutting pair of stationary arcuate permanent magnets and a thin, arcuate voice coil formed of a single winding of aluminum wire. The magnets and the voice coil are curved about a pivot axis of a rotating shaft supporting a movable head arm assembly of the rotary actuator. The voice coil, integral with the head arm assembly, pivots the head arm assembly responsive to electrical current introduced into the coil, particularly along two parallel active segments parallel to the pivot axis. The magnets are formed by a forging process which results in radial magnetic flux paths in their magnetic fields. Notches are formed in each magnet, symmetrically about longitudinal and transverse planes that bisect the magnet and spanning the radial thickness of the magnet. The notches counter-balance a gradient in the density of magnetic material from the peripheral regions to the center of each magnet, for greater consistency in motive force from interacting magnetic fields of the permanent magnet and voice coil, over the entire arcuate path traversed by the voice coil.
|
