A Piezoelectric Ultrasonic Motor

Kumada, Akio

doi:10.7567/jjaps.24s2.739

Cited by 143 publications

(28 citation statements)

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“…Some ultrasonic motors have unique shapes, such as very thin disks and rings, that are difficult to realize in electromagnetic motors. We do not offer a detailed review of the history of ultrasonic motors here, since this has already been done in several papers and books [16]. We comment only that a large part of the development of ultrasonic motors has been done in Japan since Sashida started his pioneer work about 15 years ago [8], with some studies done in the former Soviet Union from the late 1960s [7].…”

Section: Introductionmentioning

confidence: 99%

Potential ability of ultrasonic motors: A discussion focused on the friction control mechanism

Nakamura

Ueha

1998

Electron. Comm. Jpn. Pt. II

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Section: Introductionmentioning

confidence: 99%

Potential ability of ultrasonic motors: A discussion focused on the friction control mechanism

Nakamura

Ueha

1998

Electron. Comm. Jpn. Pt. II

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“…The longitudinal component of the vibrations of the stack introduces percussion impulses between the bit and the rock to fracture it when the ultimate strain is exceeded under the bit. This novel actuator 9 is a hybrid between a horn for power ultrasonics using vibratory motion as in the USDC design and an ultrasonic motor configuration that is known as the Kumada piezo-motor 13, 22. This motor configuration has been documented to have a high efficiency of 80%, relatively high torque density of 8.8 Nm/Kg 13,22 . A recent prototype built in the NDEAA lab and shown Figures 5 and 6 demonstrated drilling in limestone at a rate of 0.8 cm per minute and rotation speeds of 200 RPM.…”

Section: Figurementioning

confidence: 99%

Single piezo-actuator rotary-hammering (SPaRH) drill

et al. 2012

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The search for present or past life in the Universe is one of the most important objectives of NASA's exploration missions. Drills for subsurface sampling of rocks, ice and permafrost are an essential tool for astrobiology studies on other planets. Increasingly, it is recognized that drilling via a combination of rotation and hammering offers an efficient and effective rapid penetration mechanism. The rotation provides an intrinsic method for removal of cuttings from the borehole while the impact and shear forces aid in the fracturing of the penetrated medium. Conventional drills that use a single actuator are based on a complex mechanism with many parts and their use in future mission involves greater risk of failure and/or may require lubrication that can introduce contamination. In this paper, a compact drill is reported that uses a single piezoelectric actuator to produce hammering and rotation of the bit. A horn with asymmetric grooves was designed to impart a longitudinal (hammering) and transverse force (rotation) to a keyed free mass. The drill requires low axial pre-load since the hammering-impacts fracture the rock under the bit kerf and rotate the bit to remove the powdered cuttings while augmenting the rock fracture via shear forces. The vibrations 'fluidize' the powdered cuttings inside the flutes reducing the friction with the auger surface. This action reduces the consumed power and heating of the drilled medium helping to preserve the pristine content of the acquired samples. The drill consists of an actuator that simultaneously impacts and rotates the bit by applying force and torque via a single piezoelectric stack actuator without the need for a gearbox or lever mechanism. This can reduce the development/fabrication cost and complexity. In this paper, the drill mechanism will be described and the test results will be reported and discussed.

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“…The rotary unit is located on the back of the PZT ceramics and consists of a V type of longitudinal-torsional vibration coupling element (V-LT coupler) [23], a rotor, and a preload spring. The bottom of the V-LT coupler is connected to the PZT ceramics by bolts.…”

Section: Structure and Working Principlementioning

confidence: 99%

Impact Dynamics of a Percussive System Based on Rotary-Percussive Ultrasonic Drill

Wang

Quan

et al. 2017

Shock and Vibration

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This paper presents an impact dynamic analysis of a percussive system based on rotary-percussive ultrasonic drill (RPUD). The RPUD employs vibrations on two sides of one single piezoelectric stack to achieve rotary-percussive motion, which improves drilling efficiency. The RPUD's percussive system is composed of a percussive horn, a free mass, and a drill tool. The percussive horn enlarges longitudinal vibration from piezoelectric stack and delivers the vibration to the drill tool through the free mass, which forms the percussive motion. Based on the theory of conservation of momentum and Newton's impact law, collision process of the percussive system under no-load condition is analyzed to establish the collision model between the percussive horn, the free mass, and the drill tool. The collision model shows that free mass transfers high-frequency small-amplitude vibration of percussive horn into low-frequency large-amplitude vibration of drill tool through impact. As an important parameter of free mass, the greater the weight of the free mass, the higher the kinetic energy obtained by drill tool after collision. High-speed camera system and drilling experiments are employed to validate the inference results of collision model by using a prototype of the RPUD.

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A Piezoelectric Ultrasonic Motor

Cited by 143 publications

References 0 publications

Potential ability of ultrasonic motors: A discussion focused on the friction control mechanism

Potential ability of ultrasonic motors: A discussion focused on the friction control mechanism

Single piezo-actuator rotary-hammering (SPaRH) drill

Impact Dynamics of a Percussive System Based on Rotary-Percussive Ultrasonic Drill

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