A novel L-shaped linear ultrasonic motor operating in a single resonance mode

Abstract

In this study, a large thrust linear ultrasonic motor using an L-shaped stator is described. The stator is constructed by two mutually perpendicular rectangular plate vibrators, one of which is mounted in parallel with the slider to make the motor structure to be more compact. The symmetric and antisymmetric modes of the stator based on the first order bending vibration of two vibrators are adopted, in which each resonance mode is assigned to drive the slider in one direction. The placement of piezoelectric ceramics in a stator could be determined by finite element analysis, and the influence of slots in the head block on the vibration amplitudes of driving foot was studied as well. Three types of prototypes (non-slotted, dual-slot, and single-slot) were fabricated and experimentally investigated. Experimental results demonstrated that the prototype with one slot exhibited the best mechanical output performance. The maximum loads under the excitation of symmetric mode and antisymmetric mode were 65 and 90 N, respectively.

A Review of Application and Development Trends in Ultrasonic Motors

“…USMs offer many advantages, for example, in a simple construction, a direct drive, and a brakeless and bearingless mechanism. [96][97][98] These advantages contribute to the miniaturization of the structure. Among them, the integration of structure and function is an important development for piezoelectric drive technology.…”

Design and Locomotion Study of Two-DOF Actuator Driven by Piezoelectric–Electromagnetic Hybrid Mode

“…Because the displacement generated by each friction is very small, the actuator needs to be driven step by step to achieve more obvious output displacement, so the PEAs usually have a low speed. However, it is also because of this characteristic that the PEAs can achieve high-precision output [ 24 , 25 ]. The structure of PEAs is flexible and can realize high-precision control, but it is greatly affected by vibration and their output torque is not high.…”

A Novel Traveling Wave Sandwich Piezoelectric Transducer With Single Phase Drive: Theoretical Modeling , Experimental Validation and Application Investigation

“…Researchers have made some efforts in the research of single-phase excited piezoelectric transducers [9][10][11][12][13][14][15][16][17][18][19]. Kurosawa and Ueha used a small mass to attach in a ring piezoelectric transducer, realizing two orthogonal vibration modes with a slightly different resonant frequency excited in the ring transducer under a single power supply [9].…”

“…Chang and Tsai proposed a screw-thread-type ultrasonic motor with single-phase excitation by designing an asymmetrical piezoelectric transducer to generate two orthogonal bending vibration modes [15]. Based on the structural properties of the transducer, Ma et al [16], Dabbagh et al [17], Fan et al [18], and Zhang et al [19] developed standing wave piezoelectric transducers with single phase excitation for pushing a rotor/slider to achieve ultrasonic motors, respectively. Most aforementioned piezoelectric transducers are designed as the standing wave vibrator for ultrasonic motors.…”

“…Therefore, inspired by the transducer design method in references [9][10][11][12][13][14][15][16][17][18][19], a novel traveling wave sandwich piezoelectric transducer with single phase excitation is proposed in this study. Only one excitation signal is required to apply to the transducer, and traveling waves with the same rotational direction are produced in two driving rings utilizing the structural coupling property of a beam-ring combined element.…”