The results demonstrate that the design method is effective and available for the design of ultrasonic motors. Buy the book online at Dr. In order to implement the technical standard of ultrasonic motor, we need to establish a national ultrasonic motor testing center, which is zhao's plan. The flow in a spiral tube element is sensitive to the element attitude caused by the Coriolis force, and that a valveless piezoelectric pump is designed by applying this phenomenon. Laser Doppler vibrometer is used to measure both the frequency and vibration amplitude, and the determined first two orders resonance frequencies are 617 Hz and 1 356 Hz, respectively. As a category of non-electromagnetic driving technology, piezoelectric driving technology becomes an important branch of modern precision driving technology. On the one hand, when I first heard about the ultrasonic motor in the United States, I realized its important future prospect: the country will definitely use it in the future, so I took aim at the ultrasonic motor at that time and determined to industrialize it so that it can be truly used in all fields.
People are the same, you can not by qualifications, education to evaluate talent, must see the real skills. The results show that this model can obtain bigger stall torque. The method for further improving the performance has been discussed. The efficiency is improved by approximately 50 %. For further studying of remaining types, interested readers can consult Refs. It is hard to tell that this is an octogenarian who has had two types of cancer.
The wear estimation of the friction materials used for rotary type wave traveling ultrasonic motors is strongly required to predict life of ultrasonic motors from a design point of view. The motor utilizes an out-of-plane traveling wave and an in-plane traveling wave to drive the output shaft. Keywordspiezoelectric pump-valveless-fishtailing-rectangular vibrator-dynamics analysis-experiment This paper presents a design method of ultrasonic motors using finite element analysis and subproblem approximation method. Then, the vibration mode of pressure at the stable time and the transient rotating speed of the rotor with time are evaluated. Open to talk about feelings, voice of talent evaluation mechanism reform Science and technology workers should shoulder the responsibility given by history, be the vanguard of scientific and technological innovation in the new era, and strive to build a strong country in science and technology in the world.
The object is to optimize the characteristic length L1, and L2 of the stator in order to satisfy its vibration and contained conditions. Considering the liability to be borne to power grid, the contribution index of harmonic voltage is chosen to weigh the liability for harmonic pollution. Zhao studied vibration engineering technologies and its applications, and obtained better achievement on the identification of vibration mode parameters, the multi-point excitations and measurement technologies, the mechanical failure diagnosis technologies, the design and application of exciters, and so on. A new concept of a vibrators alternation stepping ultrasonic motor, based on longitudinal vibrations of rectangular Langevin resonators, is presented. Therefore, the ultrasonic motor is a typical dual - use military and civilian products, the future has great market prospects. Testing can not only verify the theoretical method, but also propose solutions for some problems that can not be resolved by theoretical analysis.
In this work, a novel dual stator-ring rotary ultrasonic motor is proposed, designed, fabricated and characterized for raising driving torque of the rotary ultrasonic motor operating in the flexural vibration mode. The motor is capable of bi-direction stepping movements without accumulative position errors driven by an open-loop control circuit, which provides single-phase sinusoidal signal via a switch unit to the vibrators. Besides those discussed in previous chapters, there are many other new types being studied, including a non-contact type ultrasonic motor, a piezoelectric motor using clutch, a linear surface acoustic wave motor, a vacuum type ultrasonic motor, an impact type ultrasonic motor and so on. But the news spread quickly to his wife and daughter on the other side of the ocean. The motor can be further miniaturized and it has potential to be applied to medical microrobots, endoscopes or micro laparoscopic devices, and cell manipulation devices. The company adopts a new mode of operation on the road of industrialization.
The 5th in-plane flexural vibration travelling wave, excited by the Langevin transducers around the stator ring, is used to drive the rotors. By the method of volume and momentum comparison, the stress on the bluff-body in the pump chamber is analyzed. As long as there is application and market, the research will be meaningful and vital. At the meeting, zhao chunsheng, an academician at the Chinese academy of sciences who is in charge of the project, spoke forcefully about the application of ultrasonic motors in intelligent equipment. This paper will provide the foundations to study the driving technology of squeeze film and will be helpful in the design and application of non-contact ultrasonic actuators. This article is aimed to establish one calculating method to solve this problem. The road to entrepreneurship is very bumpy.
The x-axis mover covers 30 mm forward and backward in less than 0. The speed without load in one step is 7. In addition, the integration of the military and the people is the focus of development. Buy the book online from the. It adopts the finite element method for modal analysis and harmonic analysis of the motor, and subproblem approximation method for searching the optimal solution of design variables.
Therefore, this paper provides a finite element method for analyzing its static mechanics characteristics in the state with maximal stress and strain i. The second strategy is vector decomposition control. To verify the theory, a prototype is produced. In this paper, the transient and steady-state temperature field of a traveling-wave rotary ultrasonic motor is analyzed by the finite element method, based on a theoretical model of power loss of this motor in rated operation. At the room temperature and 250 V0-p operating voltage, its stalling torque is 1.
This article presents a new type butterfly-shaped transducer linear ultrasonic motor, which utilizes symmetrical modal and anti-symmetric modal of a composite piezoelectric transducer. Meanwhile, the numerical simulation of the pump was performed. This paper presents a contact analysis and a mathematical model for a linear ultrasonic motor with a threaded output shaft. With a postdoctoral student, a doctoral student and a master's student, he began to charge toward the ultrasonic motor. In August 2002, the prototype was ready, and the identification reached the international advanced level in December. Thus, the elliptical motion of the particles on the driving feet can be obtained and the slider pressed on it can be driven alternately.
A prototype ultrasonic motor is manufactured using the design results and measured experimentally. A numerical model is developed to predict the performance and behavior of the motor, including the no-load speed, the maximum driving force, the maximum output power, and the effects of the thread pitch, the dynamic friction coefficient, the mean thread radius on motor performance. A miniature ultrasonic motor using first-order bending vibration of a cylinder with two free-free ends has been developed in this investigation. An ultrasonic motor is one of the most typical examples of utilizing vibration. Then, the fluid mechanics model of the valveless piezoelectric pump with rotatable unsymmetrical slopes was established. The instantaneous starting-up-up and stopping characteristic curve shown starting-up-up and stopping characteristics of ultrasonic motor accurately is got.