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Capstan Motor Having a Ceramic Output Shaft and an Adhesively Attached Capstan

IP.com Disclosure Number: IPCOM000080908D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Guzman, AM: AUTHOR [+2]

Abstract

This is a permanent magnet, direct-current capstan motor for use in moving magnetic recording tape in a start/stop mode at a high-repetition rate. A lightweight motor armature is shaft-connected to a tape drive capstan by a nonmetallic, ceramic, monocrystalline aluminum oxide shaft. The capstan is adhesively attached to one end of the ceramic shaft.

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Capstan Motor Having a Ceramic Output Shaft and an Adhesively Attached Capstan

This is a permanent magnet, direct-current capstan motor for use in moving magnetic recording tape in a start/stop mode at a high-repetition rate. A lightweight motor armature is shaft-connected to a tape drive capstan by a nonmetallic, ceramic, monocrystalline aluminum oxide shaft. The capstan is adhesively attached to one end of the ceramic shaft.

The motor housing consists of a tubular member 10 formed of low-carbon steel and two aluminum end bells 11 and 30. Front hell 30 is broken away to show the motor's rotating assembly. Bell 30 includes an annular cavity 31 which internally receives a portion of member 10. A magnetically permeable flux return post 13 is cantilevered supported by bell 11. Post 13 is positioned within the motor's tubular armature 36. Member 10 is magnetically permeable and forms a portion of the magnetic flux path for the motor. This flux path extends through four permanent magnets, not shown, disposed about the outside periphery of armature 36 and connected to member 10. Bell 30 includes a centrally disposed shaft receiving bore 32. The motor's rotating assembly supported in this bore by ball hearings 33 and 34.

Referring to the enlarged view of the motor's rotating assembly, a high-purity alumina ceramic shaft 35 is shown. Armature 3f is cantilevered supported by one end of shaft 35, by an electrically nonconductive hub 37 which is press fit onto one end of sh...