Abstract: A piezoelectric motor having a cylindrical outer motor casing formed by a separable two part housing that encloses and supports 3 piezoelectric actuators and a group of rotatable components. The rotatable components include a rotating output shaft that extends from the housing for coupling a load thereto, three drive rollers that engage the output shaft and are evenly spaced thereabout, and an idler ring assembly that secures the drive rollers about the output shaft when the motor is assembled. The housing has six piezoelectric stacks mounted in a fixed position to interior surfaces of the housing. Each stack is cylindrical with one flat end attached to the housing and the other flat end having a truncated cone shaped crown roller mounted thereon.

Abstract: An efficient power amplifier for high-capacitive device C2 in load string 10. The load string 10 includes a reference capacitor C3, a resistor R1, and an inductor L1. A large capacitor C1 is connected to load string 10 through high voltage power bridge 28. A current sensing feedback 30 is utilized to produce a triangular waveform of current in load string 10 for causing charge to be alternatively removed from capacitor C1 and delivered to device C2 through inductor L1 and then returned to capacitor C1 with any losses replenished by the dc power source. A voltage sensing feedback 14 is used to modulate the triangular current waveform. The power amplifier behaves as a stable linear dc coupled operational amplifier delivering a large reactive current with only slight losses.

Abstract: A hybrid integrated circuit data acquisition channel apparatus employing an operational amplifier fed by a low current differential bipolar transistor preamplifier having separate feedback gain and signal gain determining elements and providing an amplified signal output to a sample and hold and analog-to-digital converter circuits. The disclosed apparatus operates with low energy and small space requirements and is capable of operation without the sample and hold circuit where the nature of the applied input signal permits.