Browse Prior Art Database

Capstan Motor Armature Having High Resonant Frequency

IP.com Disclosure Number: IPCOM000079160D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Guzman, AM: AUTHOR

Abstract

This armature exhibits high-torsional stiffness and high damping of torsional vibration which may occur during motor operation. This armature is intended for use in a high torque - low inertia capstan motor of the type used to move magnetic tape in a rapid start/stop mode, whose start/stop frequency may be as high as 200 to 400 cycles per second. A motor of this general type is described in Volume 14, Number 6 (November 1971) of the IBM Technical Disclosure Bulletin, pages 1750-51.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 75% of the total text.

Page 1 of 2

Capstan Motor Armature Having High Resonant Frequency

This armature exhibits high-torsional stiffness and high damping of torsional vibration which may occur during motor operation. This armature is intended for use in a high torque - low inertia capstan motor of the type used to move magnetic tape in a rapid start/stop mode, whose start/stop frequency may be as high as 200 to 400 cycles per second. A motor of this general type is described in Volume 14, Number 6 (November 1971) of the IBM Technical Disclosure Bulletin, pages 1750-51.

Tubular printed-circuit armature 1 is rigidly supported at one end by cup- shaped hub 2. This hub is rigidly attached, by a press fit, to one end of shaft 3. This shaft rotates on centerline axis 4. This shaft is made from a class of materials exhibiting high-torsional stiffness.

The shaft is rotatably supported in a stationary motor housing, nut shown, by two spaced bearings 5 and 6. The tape-engaging capstan 7 and an optical tachometer disk 8 are rigidly attached, by a press fit, to the other end of shaft 3. Rotation of armature 1 in the motor's magnetic field is transmitted to capstan 7 and disk 8 by way of shaft 3 and the magnetic tape is thus driven.

A stiff metallic tube 9, whose inner diameter is larger than the outer diameter of shaft 3, is positioned between bearings 5 and 6. The annular space between the tube and the shaft is filled with adhesive 10 having a high-damping characteristic. Control of the tube's damping charac...