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Metal Working

Linear-actuator-for-a-memory-storage-apparatus

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Details

Inventors: Farmer, Paul L.; Gibeau, Frank C.; Brown, Stanley F.; Plonczak, Garold W.;
Assignee: Atasi Corporation (San Jose, CA)
Primary Examiner: Hecker; Stuart N.
Assistant Examiner:
Attorney, Agent or Firm: MacPherson; Alan H., MacDonald; Thomas S., Caserza; Steven F.

A dual motor linear actuator is disclosed for use in a magnetic disc drive device. It includes a carriage reciprocatably guided between a pair of guide rails, with the accessing transducers being mounted to its inner end. Separate rectangular drive coils are affixed in symmetrical outboard relationship at the sides of the body of the carriage. The actuator assembly further includes two pairs of slab shaped magnets mounted to E-shaped magnet support structures that are integrally formed with the base of the disc drive device. The magnets are mounted to form two air gaps that are symmetrically disposed relative to a center plane and so that they respectively cooperate with the drive coils to apply motive forces on the carriage generally along two lines that are equidistantly spaced from the aforesaid plane of symmetry. The outer ends of pole pieces of the two magnet support structures are rigidly interconnected by a single plate that acts as an end pole piece for both magnet support structures.

DETAILED DESCRIPTION The rotating disc memory storage apparatus of the present invention includes an improved linear actuator which satisfies the aforementioned objectives.
The linear actuator includes a carriage, and means for mounting the carriage for reciprocating movement along a linear path that extends generally radially of the rotating disc of the memory storage apparatus.
According to the basic feature of the present invention, the carriage is reciprocatably driven by a pair of electromagnetic motors of identical construction that are symmetrically disposed relative to the centerline of the carriage to apply forces to the carriage generally along parallel lines that are laterally spaced and symmetrically disposed relative to the desired linear path of travel of the carriage.
The pair of laterally and symmetrically spaced linear motors together provide powerful actuation forces to thereby achieve rapid access times and stabilize the carriage against vibrations.
The two motors also occupy only a small radial volume and together produce insignificant magnetic leakage in the vicinity of the peripheries of the rotating discs.
The magnets of each of the pair of motors are designed to provide one-half of the force needed to drive the carriage so that the magnetic fields associated with each motor are relatively reduced in comparison to the magnetic field that would be associated with a single linear motor of the known conventional linear actuators.
Due to the reduced field strength, the stray leakage at the ends of the linear motors of the present invention will be insignificant.
In the preferred embodiment, the improved actuator assembly of the present invention utilizes two pairs of permanent magnets mounted to the base of a magnetic disc memory storage apparatus in a symmetrical relationship relative to a vertical plane through the desired linear path of travel of the carriage.
The carriage has a construction which is also symmetrical about a plane through the carriage's centerline.
In the preferred embodiment, two separate drive coils are secured upon the carriage, each coil having at least one effective winding section that registers with the air gap of the associated pair of magnets

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