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Incremental Tachometer

IP.com Disclosure Number: IPCOM000091453D
Original Publication Date: 1968-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Viele, L: AUTHOR

Abstract

Tachometer 10 is useful in conjunction with the output shaft of a stepping motor or other incremental motion device. A strip of magnetic tape 12, prerecorded with approximately of from 800 to 1000 bits per inch, passes between pulleys 14 and 16, and is driven by output shaft 18 of motor 20. Tape 12 Passes over magnetic read head 22. The frequency of the resultant output is proportional to speed and the number of cycles is directly related to displacement. Head 22 is connected through amplifier 24 either to oscilloscope 26, a counter 28 or to frequency-to-voltage converter 30, itself connected to oscilloscope 26. Tachometer 10 overcomes certain deficiencies of mechanical tachometers. For example, tape 12 need only move a small distance to register an output, e. g., a few tenths of an inch.

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Incremental Tachometer

Tachometer 10 is useful in conjunction with the output shaft of a stepping motor or other incremental motion device. A strip of magnetic tape 12, prerecorded with approximately of from 800 to 1000 bits per inch, passes between pulleys 14 and 16, and is driven by output shaft 18 of motor 20. Tape 12 Passes over magnetic read head 22. The frequency of the resultant output is proportional to speed and the number of cycles is directly related to displacement. Head 22 is connected through amplifier 24 either to oscilloscope 26, a counter 28 or to frequency-to-voltage converter 30, itself connected to oscilloscope 26. Tachometer 10 overcomes certain deficiencies of mechanical tachometers. For example, tape 12 need only move a small distance to register an output, e. g., a few tenths of an inch. Also, the inertia of this tachometer is relatively small compared to conventional mechanical tachometers.

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