Results 241 to 250 of about 74,223 (298)
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The Journal of the Acoustical Society of America, 2011
A motorized scanhead device is capable of rotating an array transducer through 360 degrees of angular rotation in a manner such as to provide acquisition of images in successive scanning planes arranged around the principal axis of the device. The device can be incorporated in endoscopes (e.g., transesophageal endoscopes), laparoscopes, endocavity or ...
AimeĢ Flesch, An Nguyen-Dinh
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A motorized scanhead device is capable of rotating an array transducer through 360 degrees of angular rotation in a manner such as to provide acquisition of images in successive scanning planes arranged around the principal axis of the device. The device can be incorporated in endoscopes (e.g., transesophageal endoscopes), laparoscopes, endocavity or ...
AimeĢ Flesch, An Nguyen-Dinh
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The Journal of the Acoustical Society of America, 1995
An ultrasonic linear motor including a traveling member having a columnar leg portion abutting at its one end against a traveling surface, and a piezoelectric element mounted on the traveling member for vibrating the leg portion in a direction intersecting an axis of the leg portion.
Kazumasa Onishi, Koichi Naito
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An ultrasonic linear motor including a traveling member having a columnar leg portion abutting at its one end against a traveling surface, and a piezoelectric element mounted on the traveling member for vibrating the leg portion in a direction intersecting an axis of the leg portion.
Kazumasa Onishi, Koichi Naito
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An Ultrasonic Motor Model for Bacterial Flagellar Motors
Journal of Theoretical Biology, 2001A model for the transduction of energy occurring in bacterial flagellar motors is presented. In this model, the influx of ions across the channel causes the cyclic conformational change of the channel itself, which in turn produces travelling waves in one of the subcomponents of the motor, the C ring.
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A Piezoelectric Ultrasonic Motor
Japanese Journal of Applied Physics, 1985A piezoelectric ultrasonic motor is constructed by tightly contacting a rotor to a piezoelectric ultrssonic resonator with eliptical vibrstion (PUREV). The PUREV successfully operated with a torsion coupler in which a torsional mode coupled with a bending mode is excited by the same frequency longitudinal vibration.
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The Journal of the Acoustical Society of America, 1994
A linear ultrasonic motor which presses a rail against an ultrasonic vibrator, which is substantially elliptically vibrating and conducts relative movement, wherein a protrusion or a groove is provided such that the sectional form of the rail is concave, convex, trapezoidal or triangular.
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A linear ultrasonic motor which presses a rail against an ultrasonic vibrator, which is substantially elliptically vibrating and conducts relative movement, wherein a protrusion or a groove is provided such that the sectional form of the rail is concave, convex, trapezoidal or triangular.
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1993
Abstract We shall first define the ultrasonic motor, then discuss some of the earlier researches which preceded the invention by Sashida. An ultrasonic motor is a type of actuator that uses mechanical vibrations in the ultrasonic range as its drive source. Human ears are capable of detecting sound waves from 50 Hz to 20 kHz.
Toshiiku Sashida, Takashi Kenjo
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Abstract We shall first define the ultrasonic motor, then discuss some of the earlier researches which preceded the invention by Sashida. An ultrasonic motor is a type of actuator that uses mechanical vibrations in the ultrasonic range as its drive source. Human ears are capable of detecting sound waves from 50 Hz to 20 kHz.
Toshiiku Sashida, Takashi Kenjo
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An energy harvesting type ultrasonic motor
Ultrasonics, 2017An energy harvesting type ultrasonic motor is presented in this work. The novel motor not only can drive and/or position the motion mechanism, but also can harvest and convert the vibration-induced energy of the stator into electric energy to power small electronic devices.
Guangqing, Wang +4 more
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Integration of a piezoelectric transformer and an ultrasonic motor
Ultrasonics, 2003Ultrasonic motors are usually operated at an AC voltage higher than a regular battery. This implies the need of a voltage step-up transformer. In this paper, we report the integration of a piezoelectric transformer (PT) with an ultrasonic motor and a simple drive circuit.
Suwan, Manuspiya +2 more
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Piezoelectric Ultrasonic Motors
Journal of Intelligent Material Systems and Structures, 1995Piezoelectric ultrasonic motors are a new type of actuator. They are characterized by high torque at low rotational speed, simple mechanical design and good controllability. They also provide a high holding torque even if no power is applied. Compared to electromagnetic actuators the torque per volume ratio of piezoelectric ultrasonic motors can be ...
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Ultrasonic motors with polymer-based vibrators
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2015With their characteristics of low density and elastic moduli, polymers are promising materials for making ultrasonic motors (USMs) with high energy density. Although it has been believed for a long time that polymers are too lossy to be applied to high-amplitude vibrators, there are several new polymers that exhibit excellent vibration characteristics.
Jiang Wu +3 more
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