A finite volume method and experimental study of a stator of a piezoelectric traveling wave rotary ultrasonic motor

Bolborici, Valentin; Dawson, F.P.; Pugh, M. C.

doi:10.1016/j.ultras.2013.10.005

Cited by 38 publications

(20 citation statements)

References 6 publications

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“…2. It is mainly composed of a pre-tightening nut (1), two pieces of rotor disc (2), stator (3) and shaft (4). Adjusting the nut position along the shaft can change the pressure provided by the disk-spring (9) which glued on the hollow rotor disc.…”

Section: Design Principle Of the Sandwich Structure Usmmentioning

confidence: 99%

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Experimental investigation on sandwich structure ring-type ultrasonic motor

et al. 2015

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Section: Design Principle Of the Sandwich Structure Usmmentioning

confidence: 99%

“…The common pattern of divisional polarization [4][5][6][7][8] is shown as Fig. 1, (a) is two-phase divisional polarization and (b) is equally divisional polarization.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on sandwich structure ring-type ultrasonic motor

et al. 2015

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“…The Shinsei ultrasonic motor and Piezoelectric Ultrasonic Motor of Rotary (PUMR) series are commonly used in the MRI-compatible surgical robots hitherto developed. Ultrasonic motors have certain advantages, such as large torque [19], high holding torque (approximately 1.0 Nm) [20], compactness, lightness, zero backlash, an ability to operate in a strong magnetic field [21], absence of a generated magnetic field, quiet operation, simple structure [19], fast dynamic response, and high efficiency [21].…”

Section: Introductionmentioning

confidence: 99%

“…Despite the above benefits, USMs are limited by their nonlinear behaviors and short life spans [21]. They contain conductive materials [20], such as a metal ring in the stator, which is required for exciting the piezoceramic materials, and a metallic case for dissipating heat generated by friction between the motor and stator.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Temperature Increase of an Ultrasonic Motor in a 3-Tesla Magnetic Resonance Imaging System

2017

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This paper aims to evaluate the temperature increase caused by a 3.0-T magnetic resonance imaging (MRI) system on an ultrasonic motor (USM) used to actuate surgical robots in the MRI environment. Four fiber-optic temperature sensors were attached to the USM. Temperature was monitored outside the five-Gauss boundary and then inside the bore for 20 min while the USM was powered on. The USM temperature was tested for two states of the scanner, "off" and "on", by employing common clinical imaging sequences and echo planar imaging sequences. The USM showed a slight temperature increase while operating in the static field of the MRI. A considerable temperature increase (~10 • C) was observed when the scanner was on. The temperature increased to 60 • C, which is beyond the acceptable safe temperature and can result in thermal burns. Most of the temperature increase (80%) was due to effects of the static field on the motion of the rotating parts of the motor, while the remainder (20%) derived from heat deposited in the conductive components of the USM due to radiofrequency pulses and gradient field changes. To solve the temperature increase, the metal components of the USM's case can be replaced by silicon carbide.

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“…It could be used as pressure sensors, ultrasonic motors, transducers and varied actuators [5][6][7][8] . However, the constitutive relation of ferroelectric materials possesses so strong and complex nonlinear properties that it is difficult to accurately model the hysteresis and butterfly loops.…”

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confidence: 99%

Three-Dimensional Phase Field Simulations of Hysteresis and Butterfly Loops by the Finite Volume Method

Chen

et al. 2015

Chinese Phys. Lett.

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Three-dimensional (3D) simulations of ferroelectric hysteresis and butterfly loops have been carried out based on solving the time dependent Ginsburg-Landau equations by using a finite volume method. The influence of externally mechanical loadings with a tensile strain and a compressive strain on the hysteresis and butterfly loops has been studied numerically. The 3D ferroelectric domain formation and its evolution have also been presented in the paper. The simulation results successfully reveal the macroscopically nonlinear response to the applied stresses and electric field. 77.80.Dj, 78.20.Bh Ferroelectricity is one of the fastest growing fields during the past several decades. Interest in this field is attributable to the increasing numbers of practical applications in micro-electromechanical systems, microwave devices, and memory PACS:

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A finite volume method and experimental study of a stator of a piezoelectric traveling wave rotary ultrasonic motor

Cited by 38 publications

References 6 publications

Experimental investigation on sandwich structure ring-type ultrasonic motor

Experimental investigation on sandwich structure ring-type ultrasonic motor

Measuring the Temperature Increase of an Ultrasonic Motor in a 3-Tesla Magnetic Resonance Imaging System

Three-Dimensional Phase Field Simulations of Hysteresis and Butterfly Loops by the Finite Volume Method

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