Abstract
A mechanical model of a longitudinal oscillation ultrasonic motor and a method ofanalyzing its frequency–temperature characteristics are presented. The stickingand slipping between the stator and the rotor in the intermittent contact regionare analyzed theoretically. An analytical expression for the motor’s driving forcethat undergoes continuous changes is given. The behaviors of the ultrasonic motor(USM), including the revolving speed of the rotor, the output kinetic energyfrom the rotor to the other object, the input kinetic energy from thebeam tip, and the efficiency of the energy transformation, are discussed.The effects of the initial compressive force, driving frequency, load, andthe moment of inertia of the motor on the behavior of the motor areexamined. In the study of the temperature effect, the course of the vibration ofthe piezoelectric element inside the USM is expounded, the main factorsaffecting the frequency–temperature characteristics are analyzed, andthe analytical expression for the change of the resonance frequency withrespect to the temperature is given. Numerical simulations show that theresults obtained in this paper agree with reported experimental results.
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