Sound Field Characteristics in Air Gaps of Noncontact Ultrasonic Motor Driven by Two Flexural Standing Wave Vibration Disks

Autor:	Yasuhiro Yamayoshi, Jun Shiina, Seiji Hirose, Hideki Tamura
Rok vydání:	2010
Předmět:	Physics Stator Acoustics General Engineering General Physics and Astronomy Particle displacement Acoustic wave law.invention Quantitative Biology::Subcellular Processes Vibration Standing wave law Ultrasonic motor Air gap (plumbing) Sound speed gradient
Zdroj:	Japanese Journal of Applied Physics. 49:07HE16
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.49.07he16
Popis:	The sound field characteristics in the air gaps of the noncontact ultrasonic motor driven by two flexural standing wave vibration disks were analyzed by finite element method (FEM). Standing wave sound fields with an opposite phase were generated in the two air gaps by a single driving stator. Traveling wave sound fields in the two air gaps are formed as the superposition of the standing wave sound fields generated by two stators whose temporal phases and spatial positions are different from each other. The traveling direction of the calculated sound fields coincided with the rotating direction of the rotor observed in the experiments. The intensity of the sound field generated in the air gap by the single driving stator was measured by detecting the voltage induced in another stator. A gap distance wider than 0.5 mm is required for a high revolution speed because the sound field generated in the gap on the opposite side of the rotor is weak in an air gap narrower than 0.3 mm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e225767a7fa33972a304503e71f16ea4 https://doi.org/10.1143/jjap.49.07he16 Zobrazit plný text záznamu