P5G-1 Optimization of a Single Phase Ultrasonic Linear Motor

Abstract

Piezoelectric ultrasonic motors are superior to electromagnetic micromotors, because their efficiency remains theoretically constant during miniaturization. However, the still relatively recent technology has a considerable unexploited optimization potential. Numerical structural analysis by the means of the finite element method (FEM) is a common approach for dimensioning piezoelectric motors. Consequently, there is a need for efficient optimization procedures fitted to the FEM simulation. We developped a dedicated design methodology to first well understand the influence of the geometrical parameters on the movement of the motor. The parameters with the strongest influence on the objective function, the vibration amplitude of the resonator, were used in a following optimization stage. The operation of the optimized motor was proofed on a test bench. Interferometrical measurements validated quantitatively the FEM model along with the suggested design methodology.

Design and Performance Evaluation of a Single-Phase Driven Ultrasonic Motor Using Bending-Bending Vibrations

“…However, the consistency demand of the frequency of this longitudinal bending hybrid mode is relatively high. Flueckiger et al proposed a single-phase ultrasonic motor, in which the longitudinal vibration mode was converted to the particular deformation of the resonator [ 15 ]. However, to obtain the forward motion, a signal frequency of 84 kHz was utilized, and to achieve the backward motion, a signal frequency of 69 kHz was used; thus, the output mechanical characteristics of the bi-directional motions are not consistent.…”

Simple bidirectional linear ultrasonic motor driven by single-phase signal

“…Piezoelectric motors can be divided into multi-phase [7][8][9][10] and single-phase [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] motors, depending on the number of driving signals. A multi-phase piezoelectric motor needs multiple driving signals and precise phase control between signals.…”

“…They [13] also designed a "Baltan" microactuator using one driving signal based on an asymmetric stator structure. Flueckiger et al [14] proposed a "scissor" single-phase motor that can allow bidirectional operation by switching two working frequencies.…”

Exciting electrode optimization of a piezoceramic plate type ultrasonic motor by combining artificial immune algorithm and finite element analysis

“…Optimization algorithm is widely used in the optimal design of ultrasonic motors, and most of the optimization procedures utilize the “Optimizer+FEA” way (Silva and Kikuchi, 1999; Silva, 2000; Canfield and Frecker, 2000; Loveday et al , 2004; Zhao et al , 2005; Bouchilloux and Uchino, 2003; Flueckiger et al , 2007; Li and Yang, 2008). The finite element analysis (FEA) is used to approximately calculate the electromechanical coupling of ultrasonic motor vibrators, thus the objective function is non‐linear and discontinuous.…”

“…However, the used sequential linear programming (Silva and Kikuchi, 1999; Silva, 2000; Canfield and Frecker, 2000), moving asymptotes (Loveday et al , 2004) and the constrained variable metric method (Zhao et al , 2005) generally need to calculate the gradient of objective function, thus the objective function should be continuous. The genetic algorithm (Bouchilloux and Uchino, 2003), weep optimization algorithm (Flueckiger et al , 2007) and the particle swarm algorithm (Li and Yang, 2008) may break through this limitation. Nevertheless, they have disadvantages of lower convergence velocity and premature termination.…”