Abstract
Linear ultrasonic motor is more and more widely used. Based on the coupling of longitudinal and flexural mode, the piezoelectric stator induces the elliptical locus of contact points to drive the rotor. Now, how to determine the size of a linear ultrasonic motor is still an important problem. Here, we use Shi’s structure of the linear ultrasonic motor and reconstruct the finite element model by the parametric design language of APDL to execute modal, harmonic, transient and contact analyses. We find the frequency of longitudinal mode is only related to the length of the piezoelectric stator and the frequency of flexural mode is related to the length and width of the piezoelectric stator. Based on the results, we put forward a simple strategy to design the linear ultrasonic motor. We find that viscous damping is important to the coupling. Suitable viscous damping gives a large frequency band where the longitudinal and flexural modes are inspired simultaneously. Our results also give a minimum limit of the number of substeps in a period in transient analysis.
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