Investigation of Miniature Cantilever-Type Ultrasonic Motor Using Lead-free Array-Type Multilayer Piezoelectric Ceramics

We studied the following to clarify the design rule of the miniature cantilever-type ultrasonic motor using lead-free array-type multilayer piezoelectric ceramics, which is (Sr,Ca) 2 NaNb 5 O 15 . The relationship between the motor properties and stator vibrator dimensions was investigated by the fi...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 49; no. 7; pp. 07HE25 - 07HE25-6
Main Authors Doshida, Yutaka, Shimizu, Hiroyuki, Irieda, Taisei, Tamura, Hideki, Tomikawa, Yoshiro, Hirose, Seiji
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.07.2010
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Summary:We studied the following to clarify the design rule of the miniature cantilever-type ultrasonic motor using lead-free array-type multilayer piezoelectric ceramics, which is (Sr,Ca) 2 NaNb 5 O 15 . The relationship between the motor properties and stator vibrator dimensions was investigated by the finite element method and vibration analysis. The motor properties mainly depended on the cantilever sizes. The motor properties can be especially controlled from the revolution-speed-oriented type to the torque-oriented type by adjusting the vamplate radius of the cantilever. As a result, the design rule was clarified. In accordance with the design rule, the lead-free torque-oriented motor was fabricated and its properties were evaluated. The driving properties of this motor changed to the torque-oriented characteristics, such as the ratio of the maximum torque to the maximum speed was over 1200-fold of that of the motor fabricated in a previous study. It appeared that the driving properties of the lead-free cantilever-type motor can be controlled by using the design rule.
Bibliography:(Color online) Structure of cantilever-type ultrasonic motor using A-MLPC of SCNN, (a) schematic, overview, and SEM image of cross section for A-MLPC, (b) wire diagram of A-MLPC, (c) stator vibrator and vibration mode, and (d) side view of motor. (Color online) Flow diagram to search for design rule of cantilever-type ultrasonic motor. (Color online) Equivalent circuit and schematic views by FEM of stator vibrator with preload to vamplate at resonance. Dimensions of stator vibrator as parameters. Simulated and measured results of $h_{\text{s}}$ dependence of (a) resonance frequency and electromechanical coupling coefficient, and (b) maximum revolution speed and torque. Simulated results of power density correlate with $h_{\text{s}}$. Simulated and measured results of $r_{\text{s}}$ dependence of (a) resonance frequency and electromechanical coupling coefficient, and (b) maximum revolution speed and torque. Simulated results of power density correlate with $r_{\text{s}}$. Simulated and measured results of $r_{\text{v}}$ dependence of (a) resonance frequency and electromechanical coupling coefficient, and (b) maximum revolution speed and torque. Simulated results of power density correlate with $r_{\text{v}}$. (Color online) Side view and equivalent constants of stator vibrator of torque-oriented motor. (Color online) Revolution speed vs torque characteristics for torque-oriented motor. Revolution speed vs torque characteristics for motor of basic size. (Color online) Revolution speed vs driving voltage characteristics for torque-oriented motor with CD-R-shaped rotor.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.49.07HE25