Moving magnet disc drive actuator

Details Moving magnet disc drive actuator Moving magnet disc drive actuator

G - Physics

11

B

352/24.31

G11B 5/55 (2006.01) G11B 21/02 (2006.01) H02K 41/035 (2006.01)

Patent

CA 1246214

MOVING MAGNET DISC DRIVE ACTUATOR Frank G. Gibeau Paul L. Farmer ABSTRACT A transducer actuator assembly (10) for a rotating disc memory apparatus has at least one pair of coils (40, 41) symmetrically spaced from a center plane of a linearly moving carriage (21) where the coils are stationary with respect to a fixed actuator base (11) and surrounding spaced center poles (34) of a magnetic pole piece flux return structure (31, 32, 33) having an E-Shaped configu- ration closed by pole plate (38). At least one pair of magnets (24a-d or 60, 61) are affixed to and extend hori- zontally from the sides (23) of the carriage and are spaced in longitudinally extending air gaps (45-48, 49) between the fixed coils and linearly extending pole piece portions (32, 33). Due to the low mass and small envelope size of the moving carriage-magnets subassembly and the removal of the heat generating coils from the carriage, very rapid access times with high location accuracies are possible along with minimization of magnet field effects on the memory discs being accessed.

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