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Browse Prior Art Database

Voice Coil Motor with Tacho-Generator

IP.com Disclosure Number: IPCOM000111321D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Ando, H: AUTHOR [+3]

Abstract

This article describes how to introduce a Tacho-Generator in a small hard disk drive. A Voice Coil Motor (VCM) retains the same size as that of a normal VCM which does not have a Tacho-generator.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Voice Coil Motor with Tacho-Generator

      This article describes how to introduce a Tacho-Generator in a
small hard disk drive.  A Voice Coil Motor (VCM) retains the same
size as that of a normal VCM which does not have a Tacho-generator.

      The coil of this invention consists of two or more coils and
two terminals.  One terminal is connected with a VCM coil which
generates actuator drive power.  Another is connected with a
Tacho-Generator coil which generates proportional voltage to the
actuator rotational speed.

      The construction of the VCM coil is shown in the Figure.  Some
magnet wires are wound into the VCM coil at the same time.  As the
result of the magnet wire winding, a multi-coil-accumulated VCM coil
is manufactured.  One of the many coils is used for the
Tacho-Generator.  The others are used for VCM coil which generates
the actuator drive power.  So the coil has two terminals.  One is for
a VCM, and the other is for a Tacho-Generator.

The point of this invention is to use the VCM magnetic flux for the
Tacho-Generator .