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Piezoelectric Stepping Motor

IP.com Disclosure Number: IPCOM000080250D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Hauke, FE: AUTHOR

Abstract

This stepping motor includes two piezoelectric transducers which are mounted orthogonally and connected to drive a movable rod tip, so as to impart stepping motion to a wheel or roller, for example a tape drive capstan.

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Piezoelectric Stepping Motor

This stepping motor includes two piezoelectric transducers which are mounted orthogonally and connected to drive a movable rod tip, so as to impart stepping motion to a wheel or roller, for example a tape drive capstan.

Piezoelectric transducers 10 and 11 are mounted at fixed positions on support walls 12 and 13. These transducers are energized or driven by oscillator
14. The oscillator is connected to be controlled by motion controller 15. The output of the oscillator is applied directly to voltage amplifier 16, and to voltage amplifier 16, and to voltage amplifier 17 through variable-phase delay network
18. Motion controller 15 controls the frequency and phasing between the two alternating voltages which drive the transducers, to thereby control the speed and direction of capstan 19.

The mechanical motion of transducers 10 and 11 is represented by arrows 20 and 21. This mechanical motion is transmitted to rod 22 by flexible rods 23 and
24. The transducers are energized to first produce a component of rod motion toward the capstan, causing tip 25 to engage the peripheral surface of the capstan. The next component of rod motion causes the rod to move up and down, depending upon the direction command. As a result incremental rotation of the capstan occurs. The next component of rod motion is to withdraw the tip from capstan engagement and restore it to the orginal position, as shown, awaiting the next motion cycle.

This motor produces...