Browse Prior Art Database

Servo-Controlled Friction Drive Linear Motor

IP.com Disclosure Number: IPCOM000035388D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Stuckert, PE: AUTHOR

Abstract

A rolling ring traverse mechanism includes an improvement for infinitely variable and precise control of direction of motion and velocity of motion in either direction of a rolling ring along a rotating shaft. Shaft 2 has a unidirectional rotation driven by motor 4. A center rolling ring 6 has attached thereto control arm 8 which is also typically coupled to left rolling ring 10 and right rolling ring 12. Control arm 8 includes at an end thereof of a curved portion 14 which rotates about point 16 which is the pivot point of center rolling ring 6. The ends of curved portion 14 serve as magnetic armatures to respective solenoid coils 18 and 20, respectively.

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Servo-Controlled Friction Drive Linear Motor

A rolling ring traverse mechanism includes an improvement for infinitely variable and precise control of direction of motion and velocity of motion in either direction of a rolling ring along a rotating shaft. Shaft 2 has a unidirectional rotation driven by motor 4. A center rolling ring 6 has attached thereto control arm 8 which is also typically coupled to left rolling ring 10 and right rolling ring 12. Control arm 8 includes at an end thereof of a curved portion 14 which rotates about point 16 which is the pivot point of center rolling ring 6. The ends of curved portion 14 serve as magnetic armatures to respective solenoid coils 18 and 20, respectively.

A voltage Ed is applied to subtractor circuit 20 which generates a difference signal between the desired position as represented by voltage Ed and the current position as represented by voltage Eo to produce an error voltage EW as an input to solenoid driver 22.

Current position voltage Eo is produced from a moving arm potentiometer 24 having the arm attached to center rolling ring 6 to produce a voltage indicative of the current orientation of center rolling ring 6. Solenoid driver 22 drives control arm 8 either to the left or right depending upon the sign of voltage EW with the velocity depending upon the magnitude of voltage EW .

As the center rolling ring 6 moves to the desired position as represented by voltage Ed, potentiometer arm 24 produces voltage EOequal t...