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Browse Prior Art Database

Symmetrically Floated Voice Coil Actuator

IP.com Disclosure Number: IPCOM000087621D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Bastianelli, C: AUTHOR [+3]

Abstract

Voice coil motors (VCMs) are commonly used to position magnetic heads to preselected information-bearing tracks on a magnetic disk or disks of a disk file. Such magnetic disks are generally mounted for rotation on a spindle supported in a spindle-support casting. The spindle-support casting itself is generally supported in a rigid baseplate which also supports the VCM. It is also possible that the spindle-support casting and baseplate are one and the same structure.

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Symmetrically Floated Voice Coil Actuator

Voice coil motors (VCMs) are commonly used to position magnetic heads to preselected information-bearing tracks on a magnetic disk or disks of a disk file. Such magnetic disks are generally mounted for rotation on a spindle supported in a spindle-support casting. The spindle-support casting itself is generally supported in a rigid baseplate which also supports the VCM. It is also possible that the spindle-support casting and baseplate are one and the same structure.

A VCM comprises a heavy magnet structure defining a generally annular flux gap between pole pieces and a moving coil which intercepts the flux in the gap to move linearly in an axial direction when a current is passed through the coil. In a disk file application, the coil is coupled to a head/carriage assembly mounted for movement radially of the disks. Head/carriage assembly motion causes a reaction in the VCM magnet structure which may excite vibrations in the baseplate or spindle-support casting. To reduce such vibrations it has been proposed to float the VCM magnet structure.

In the drawing there is shown a particularly advantageous way of floating a VCM magnet structure 1 having a flux gap 2 in which moves the VCM coil (not shown) coupled to a head/carriage assembly (not shown). The magnet structure 1 is supported at both ends by ring flexure assemblies 3 in which a layer of damping material 4 is laminated between two metal sheets 5. The ring flexures are...