Papers by Keyword: Ultrasonic Motor

Abstract: The glass nanopore produced by the physical method has better physical characteristics, higher strength, stronger stability, longer life and other significant features compared with the chemical method. The purpose of this paper is to study DNA sequencing (973 project) to provide experimental basis for preparation of glass capillary 5nm 3D nanochannel In this paper, we design a set of glass capillary tension system which is controlled by laser heating and linear ultrasonic motor and produced successfully the device for the preparation of nanopore below 50 nm. In addition, the use of micro droplet generation system has carried out preliminary characterization of nanopore drawn devices. Seen from the characterization, the nanopore device fabricated can indeed produce a through-hole.

Abstract: The authors have developed a translational and rotational motor in one device by ultrasonic drive technology. This motor has two degree of freedom, that is, translational movement and rotational movement (TR motor). Two movements are controlled independently or simultaneously such as screw movement. As the motor is driven by ultrasonic vibration at the resonant frequency, the motor (stator) is designed and optimized by FEM analysis. Based on the analysis of FEM, the authors have developed a TR motor successfully. It shows good controllability in both movements.

Abstract: In order to obtain a high rotational speed in comparison with the known embodiments, due to the increased amplitude of the contact point between the rotor and the active element, due to the possibility of adjusting the speed by changing the frequency of the two signals applied to the coupled discs, or due to the phase shift between the signals if the discs are supplied at the same frequency, it was achieved a stator by a non-removable coupling of two active elements. Modelling was performed in Comsol Multiphysics. In this respect we studied the variation of the strains and of the electrical potential, taking into account the changing of the parameters like the power voltage frequency, the power voltage amplitude, the distance between the support point and the edge of the discs system.

Abstract: We have developed a movable stent motor in the blood vessel by applying the technique of the ultrasonic motor. We have also designed a stent motor which consists of two parts; a stator part and receiver part. The receiver unit obtains the ultrasonic wave from outside and the stator generates a driving force. The stator is the coil shape and it can move smoothly in intravascular. Adding that, we have designed the horn to provide ultrasonic energy to it from outside of human body. We have made experiments by the horn and the stent motor and we have succeeded in driving the stent motor in the water back and forth.

Abstract: An ultrasonic motor using thrust ball bearing with dimple structure on the friction surface has been proposed. The bearing balls are rotated by the friction force caused by the ultrasonic vibration of the stator, and transfer torque to the rotor. The dimple structure on the sliding surface can hold the ball position and rotate the balls and the rotor without a retainer. The newly proposed motor can avoid the friction loss between balls and the retainer. The balls of 2.4 mm in radius are used and the radii of the curvature of the dimples of 2.0 mm and 3.0 mm are used in this research. The radius difference changes the contact condition between the balls and the dimple structure. Fundamental motor characteristics are measured and discussed.

Abstract: The relatively simple control strategy can decrease the complexity of the ultrasonic motor system and increase the cost performance. The nonlinear iterative learning control algorithm is simple, the control parameters can be determined according to little experimental knowledge. According to the control characteristics of ultrasonic motor, the nonlinear iterative learning control algorithm is improved and the nonlinear iterative learning control strategy of motor’s speed is designed. Experiments show that the motor system has good iterative learning capacity, the control effect is improved generally in the repeated learning process and the control strategy is simple and effective.

Abstract: Build the mathematical model and mechanical model of ultrasonic motor which using bending vibration transducer. Based on this model, analyze the contact and friction processes between driven-foot which belonging to ultrasonic motor which using bending vibration transducer and guide rail. Analyze the influence preload force make to the process of motor’s running. Take the cases of stick, slip, flight into consideration, and explain nonlinearity of the Dynamics. Do computer simulations of starting process though this model, and summarize the motor’s working results when it works under different conditions.

Abstract: The nanofluidic devices with the nanopores are the foundation of the third generation of the DNA sequencing technology. Comparing with the traditional nanopores constructed on the nanofilms, the nanofluidic devices made by the SiO2 have higher stiffness, strength and stability. We study on the structure design of glass capillary tension feed system, used in manufacture of the nanofluidic devices with the nanopores. Firstly, we design glass capillary tension feed system, including the mechanical moving parts, heating parts and the control parts, which is used to heat glass capillary and stretch it to get glass capillary with a smaller inner diameter in need. Among them, the control accuracy of the moving parts is up to 1μm, the heating range of heating parts is less than 5mm, and the temperature can reach 1500 ̊C. Then we make a prototype, and do some experiments with it. According to the experiment results, the system can be used for glass capillary tension, and the inner diameter of the nanoglass capillary stretched by this system is as small as 500 nm.

Abstract: In resent years, due to advances in science technology, space satellites have made progress. So, the presence of space debris has become problem in the world because they may collide each other. In our study, we have developed Spherical Ultrasonic Motor (SUSM) for space use with 3 DOF to drive the satellite thruster and resolve it. We aim that the satellites enter the atmosphere when the satellites reached the end of life, and SUSM controls thrusters when they inject for the directional control. We have made experiments of measuring torque, durability and lifetime. It shows that the torque and lifetime meets target value. But durability does not meet target value. To resolve it, we have applied stator lining materials and shifted frequency with 0.4 kHz from resonant frequency and we have shown that it meets durability-required specifications.

Abstract: A new type linear ultrasonic motor using Second-order bending and First-order torsional modes (2B-1T) is proposed. The ultrasonic motor has two driving feet and the continuous linear motions of sliders are realized by the frictional force between stator and sliders. In this new design, bending vibration is excited by d₃₃ mode, which controls the preload pressure, and torsional vibration is excited by d₁₅ mode, which generates the driving force. The elliptical trajectories of both feet are achieved, when the phase difference of the two modes is 90° in time and space. The working principle of ultrasonic motor using 2B-1T is simulated. A parametric model of the stator is designed. The sensitive analyses of structural parameters are gained with modal analysis. The characteristics and trajectories of driver feet are studied by transient analysis. These results can provide theoretical basis for the development of this new type ultrasonic motor.