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TitleUltrasonic motor
TagsPhysics Mechanical Engineering Physics & Mathematics Electric Motor Piezoelectricity
File Size536.4 KB
Total Pages49
Document Text Contents
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ABSTRACTABSTRACT

Ultrasonic rotary motors have the potential to meet this NASA nUltrasonic rotary motors have the potential to meet this NASA need and they areeed and they are

developed as actuators for miniature telerobotic apdeveloped as actuators for miniature telerobotic applications. These motors are being adaptedplications. These motors are being adapted

for operation at the harsh space environments that infor operation at the harsh space environments that include cryogenic temperatures and vacuumclude cryogenic temperatures and vacuum

and analytical tools for the design of efficient motors are band analytical tools for the design of efficient motors are being developed. A heing developed. A hybrid analyticalybrid analytical

model was developed to address a model was developed to address a complete ultrasonic motor as a system. Included in complete ultrasonic motor as a system. Included in thisthis

model is the influence of the rotor dmodel is the influence of the rotor dynamics, which was determined experimentally to beynamics, which was determined experimentally to be

important to the motor performance. The analimportant to the motor performance. The analysis employs a 3D finite element model toysis employs a 3D finite element model to

express the dynamic characteristics of the stator with piezoelectric elements and express the dynamic characteristics of the stator with piezoelectric elements and the rotor. Thethe rotor. The

details of the stator including the teeth, piezoelectric cedetails of the stator including the teeth, piezoelectric ceramic, geometry, bonding layer, etc.ramic, geometry, bonding layer, etc.

are included to support practical USM designs. A are included to support practical USM designs. A brush model is used for the interface labrush model is used for the interface layer yer 

and Coulomb's law for the friction between the stator anand Coulomb's law for the friction between the stator and the rotor. The theoretical predictionsd the rotor. The theoretical predictions

were corroborated experimentally for the motor. In parallel, efforts have bewere corroborated experimentally for the motor. In parallel, efforts have been made toen made to

determine the thermal and vacuum performance of these motors. To explore teleroboticdetermine the thermal and vacuum performance of these motors. To explore telerobotic

applications for USMs a robotic arm was constructed with such motoapplications for USMs a robotic arm was constructed with such motors.rs.

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