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Linear Reel Motor Servomechanism

IP.com Disclosure Number: IPCOM000074203D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Roberts, SD: AUTHOR

Abstract

This servomechanism is a position servo whose reference-position signal V1 is proportional (thru K0) to signal V0 supplied by analog capstan tachometer 2, and whose actual-position signal V3 is provided by analog column sensor 4. The operation of the position servo is modified by a velocity-error signal V5 which is generated by a comparison of the capstan tachometer signal V0 to a tape-speed signal V6 which is provided by an analog tape tachometer 7 located on the reel side of the vacuum column 8. The loop reference position V1 is automatically changed as a function of the capstan velocity and direction to provide optimum use of the column length.

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Linear Reel Motor Servomechanism

This servomechanism is a position servo whose reference-position signal V1 is proportional (thru K0) to signal V0 supplied by analog capstan tachometer 2, and whose actual-position signal V3 is provided by analog column sensor 4. The operation of the position servo is modified by a velocity-error signal V5 which is generated by a comparison of the capstan tachometer signal V0 to a tape-speed signal V6 which is provided by an analog tape tachometer 7 located on the reel side of the vacuum column 8. The loop reference position V1 is automatically changed as a function of the capstan velocity and direction to provide optimum use of the column length.

A reel of magnetic tape 9 is located on one side of the vacuum column and is bidirectionally rotated by high-inertia motor 10. Capstan 11 is located on the other side of column and is bidirectionally rotated by low-inertia motor 12. The column buffers a loop of tape 13 between the reel and the capstan to compensate for the inertial mismatch of these two tape-moving systems.

The position-error signal at summing junction 14 and conductor 15 is the algebraic difference between the reference-position signal V1 and the loop- position signal V3. This position-error signal is applied through proportionality constant network 16 to summing junction 17. At this junction the position-error signal is modified by a velocity-error signal V5 which is the algebraic sum of the tape velocity V6 and the ca...