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Thermoelectric Coldplate and Rotary Vane Compressor Life

IP.com Disclosure Number: IPCOM000107505D
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 40K

Publishing Venue

IBM

Related People

Bellar, RJ: AUTHOR [+3]

Abstract

Reel-to-reel and cartridge tape drives utilize an air compressor to provide pressurized air to hydrostatic air bearings in the tape path. The air bearings maintain a thin layer of air between the tape and the air bearing surface to reduce friction and wear in the tape path.

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Thermoelectric Coldplate and Rotary Vane Compressor Life

       Reel-to-reel and cartridge tape drives utilize an air
compressor to provide pressurized air to hydrostatic air bearings in
the tape path.  The air bearings maintain a thin layer of air between
the tape and the air bearing surface to reduce friction and wear in
the tape path.

      The IBM 3480/90 tape drives have been specified with a
compressor life of 30 to 40 thousand hours.  As new products become
smaller, the size of the compressor reduces correspondingly.  This
results in larger amounts of heat to be dissipated from smaller
areas, which, in turn, increases the compressors' nominal operating
temperature.  As a rule of thumb, the life of the compressor doubles
for every 10 degree C decrease in vane operating temperature.

      To obtain the decrease in vane temperature necessary to
increase compressor life, the application of a thermoelectric cold
plate is proposed.  The cold plate can be attached to the front face
of the compressor using thermal epoxy or mechanically by clamping.
On the cold side heat from the compressor is transferred to electrons
of the thermoelectric cold plate as they pass from one semiconductor
in a low energy state to others in a high energy state.  Heat is
removed to a heat sink on the hot side of the thermoelectric cold
plate.