Properties of Miniature Cantilever-Type Ultrasonic Motor Using Lead-Free Array-Type Multilayer Piezoelectric Ceramics of (Sr,Ca)2NaNb5O15under High Input Power

The high-power properties of c-axis crystal-oriented (Sr,Ca) 2 NaNb 5 O 15 (SCNN) plate were investigated under large-amplitude vibration using an electrical transient response. The ultrasonic motor of a 31-vibration mode using the crystal-oriented SCNN plate was fabricated and evaluated. The quality factor of crystal-oriented SCNN plate increased to about five times higher of randomly oriented SCNN and (Bi,Na,Ba)(Ti,Mn)O 3 disks. The mechanical nonlinearity behavior was not observed and the temperature dependences of the quality factor and the equivalent stiffness decreased ignorable. The high-power properties were considered to originate from decreasing strictly the internal stress induced from crystal anisotropy by the crystal-oriented morphology. The motor showed the revolution speed 100 rpm in torque from 150 μN m to 900 μN m, the output power 7.5 mW, efficiency 3.5% at 657 μN m and 109 rpm. The output power was about twotimes higher in the previous study. The performance reflects the superior high-power properties of crystal-oriented SCNN ceramics.

Section: Usm Fabrication and Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-power properties of crystal-oriented (Sr,Ca)₂NaNb₅O₁₅piezoelectric ceramics and their application to ultrasonic motors

Doshida

Tamura

Tanaka

2019

“…38) In practice, we succeeded in realizing miniature ultrasonic motor of lead-free piezoelectric ceramics using multilayer piezoelectric SCNN ceramics. 23,36,[39][40][41][42][43] Furthermore, the ultrasonic motor using c-axis crystal-oriented SCNN plate showed about 2 times higher output density of above motor and to have substitution potential as lead-free piezoelectric ceramics instead of PZT based piezoelectric materials in the high-power applications.…”

Section: Introductionmentioning

confidence: 99%

High-power properties of (Sr,Ca)₂NaNb₅O₁₅piezoelectric ceramics in a longitudinal mode

Doshida

Tamura

Tanaka

et al. 2020

The high-power properties of (Sr,Ca)2NaNb5O15 (SCNN) lead-free piezoelectric ceramics were investigated in a longitudinal mode using their rectangular column modified electrode patterns. It was hard to rise the SCNN temperature with increasing vibration velocity and we were able to drive with about a two times higher vibration velocity than that of hard-PZT. The quality factor of SCNN gradually decreased with the vibration velocity and increased with the temperature. The equivalent stiffness of SCNN was almost constant with increasing strain and there was no mechanical nonlinearity, however those of hard-PZT decreased significantly with vibration velocity and strain for the softening effect as mechanical nonlinearity. SCNN has also a positive temperature dependence of quality factor and equivalent stiffness similar in a radial vibration mode. It was clarified that the high-power properties of SCNN in a longitudinal mode had superior performance such as that of the radial vibration mode.

“…In addition to the CS-USM, various types of ultrasound motors such as linear-type motor, ring-type motor, and levitated-rotor-type motor have been investigated extensively. [8][9][10][11][12][13][14][15][16][17] Research studies on the various types of CS-USMs using piezoelectric ceramic transducers or hydrothermally synthesized lead zirconate titanate (PZT) polycrystalline film transducers, single-transducer-type CS-USMs (open-circuit-type acoustic waveguide), dual-transducer-type CS-USMs (open-circuit-type acoustic waveguide), and acoustic-energy-recycling-type CS-USM (closed-circuit-type acoustic waveguide) have been reported. [18][19][20][21][22][23][24][25][26][27] Several ultra-sound motors composed of the acoustic waveguide and driving unit similar to the CS-USM have been reported.…”

Section: Introductionmentioning

confidence: 99%

Analysis of coiled stator ultrasound motor: Fundamental study on analysis of wave propagation on acoustic waveguide for coiled stator

Ozeki¹,

Kurita²,

Uehara³

et al. 2018

In our research group, we previously developed a coiled stator ultrasound motor (CS-USM) for medical applications such as intravascular ultrasound (IVUS) devices. However, wave propagation on acoustic waveguides has not been investigated sufficiently in previous studies. In this study, we analyze the propagation velocity of elastic waves from the simulated the vibration displacement mode profile along a straight line acoustic waveguide via three-dimensional finite element method (FEM). Concerning results, elastic waves with vibration displacement along the thickness direction show dispersion characteristics corresponding to the a0 and a1 mode plate waves (Lamb waves) in the acoustic waveguide. Our theoretical hypotheses of the propagation velocities were closely borne out by experimental results. We further find that the dispersion characteristic is affected by the width of the acoustic waveguide. We believe that our findings can contribute to improved CS-USM designs for practical application.