Papers by Keyword: Ultrasonic Motor

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Authors: Wen Yu Zhang, Jing Zhuo Shi
Abstract: Push-pull driving circuit is a type of commonly used driving circuit for ultrasonic motor. The symmetrical PWM signals are needed for the control of push-pull driver, and thus the motor. This paper introduces a novel 2-phase symmetrical PWM control signal generator that can be used with ultrasonic motor drive. The generator’s structure and operation is analyzed, and the actual realization using CPLD is also given out. The experimental results proved that, the design is correct.
Authors: Zeng Hui Zhao, Yu Ping Wang, Xiang Dong Zhao, Yi Kun Yuan
Abstract: Combining the constitutive equation of piezoelectric ceramic with elastic-dynamical equations and coupling theory of FEM, the finite element control equation for piezoelectric actuator is established. Detailed calculation of the electro-mechanical coupling field parameters is made by the SP1 type longitudinal-bending vibrator and results show it can be used for the transparent calculation for piezoelectric intellectual structure and avoid the black box operation in FEM software. The model lays the foundation to develop the special program for piezoelectric actuator and to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power.
Authors: Xiao Hua Qian, Meng Hong Shen
Abstract: Linear ultrasonic motors have been of significant research interests for its excellent characteristics, but it’s hindered by complicated structure. The purpose of this paper is to design and manufacture a prototype by utilizing ANSYS software based on the analysis of mechanism. The vibrator of linear motor is composed of a three teeth rectangular medal block, two group of PZT elements which is adhered on the surface of metal block and slider. It is found that the result of FEA analysis is consistent with experiment result.
Authors: Tie Min Zhang, Zhi Yang Xie, Jian Tao Zhang
Abstract: An ultrasonic motor (USM) has been widely used in many applications since it has several advantages over the conventional electromagnetic motor, such as high torque at low speeds, no electromagnetic interference, and high holding torque without power supply. However, in order to achieve high efficiency, its electrical drive system presents unique challenges, especially in producing two-phase signal (high frequency, high voltage, phase difference of two-phase signal) input to a low impedance capacitive motor. In this paper, a novel drive system based on microcontroller (ATmega16) has been proposed for ultrasonic motor. Drive system includes power drive circuit and control system. Power drive circuit is combined from Push-Pull Inverter to provide high-frequency two-phase voltages. A microcontroller was used to control ultrasonic motor drive system. PWM signals were generated and then directly applied to the MOSFET drivers for speed control of ultrasonic motor. The frequency and phase difference of two phase PWM signals can be directly changed by microcontroller. Detailed experimental results are provided to demonstrate the successful of the proposed drive system.
Authors: Wei Qing Huang, Yin Wang
Abstract: Ultrasonic motors adopting longitudinal vibration of bar were widely studied for their considerable thrust, high efficiency and reliability. A novel ultrasonic motor using longitudinal vibration of bar with varying section was proposed in this paper. This ultrasonic motor features with two varying section bars connected by semi-circumferential structure. Elliptical trajectories of particles are formed on top of the semi-circumferential structure outer surface where driving foot located and a mover is pushed to move when the driving foot is pressed onto it. FE model of its stator was built and results of harmonic analysis verified its principle. Testing of prototype shows that this motor was capable of a 10N load with speed 100mm/s.
Authors: Xiang Cheng Chu, Ren Bo Yan, Li Yan, Long Tu Li
Authors: Wei Shan Chen, Ying Xiang Liu, Jun Kao Liu, Sheng Jun Shi
Abstract: To obtain large mechanical output power, a ring type standing wave ultrasonic motor using cantilever type bending transducer is proposed. There is a cantilever on one side of the ring, and four PZT ceramics are set on each end surface of the cantilever. The bending mode of ring is excited by the bending vibration of cantilever transducer. Thus, linear simple harmonic motions are achieved at the particles on the teeth. The working principle of proposed motor is analyzed. The ring and transducer are designed with FEM. The bending vibration modals of transducer and ring are degenerated, and the motion trajectories of nodes on the teeth are analyzed. The analysis results indicate that a standing wave is excited in the ring by the bending vibration of transducer, and the proposed motor has potential good output characteristics. The results of this paper verify the theoretical feasibility and provide instructions for the development of proposed motor.
Authors: Tai Ho Yu, Ching Chung Yin
Abstract: This paper experimentally and computationally examines the modal sensors integrated with a recently developed rotary ultrasonic motor (USM) driven by continuous wedge waves of the fundamental modes with the integer circumferential modal number. The traveling wave is formed from constructive interference of two equal-intensity standing waves induced by two comb transducers using dual sinusoidal excitations in 90 degree phase difference. The transducers and modal sensors are segmented in strips around the circumference of piezoelectric tube in the circular wedge-like motor stator. The latter are used to monitor the dynamic response of the stator during operation. The response of USM acquired by the proposed modal sensors has distinct vital characteristics in different frequency bands. The high-pass signals are used not only to note the variation in phase difference between excitations but to detect the resonant frequency, which is altered by payload, wear situation, etc. The low-pass signal reveals the revolution speed and dynamic reaction of the motor stator exerted by frictions and contact forces because of the rotor. The time-frequency response of stator is further characterized during the period in which the revolving direction of rotor is switched over.
Authors: Rui Xia Wang, Long Jin, Zhi Ke Xu, Min Qiang Hu
Abstract: Length and support mode are the key to restrict the ultrasonic motor miniaturization. This paper presents a miniature langevin-type ultrasonic motor stator, it has both short length and simple support mode. With fixed-free ends, the stator adopts a square base and is fixed at its four corners. A new excitation mode is utilized to solve the problem of insistence of excitation position in the conventional excitation mode. Since the stator is unsymmetrical along the circumferential direction, there should be an optimal excitation angle. By using finite element method, axial displacement and radial displacement of nodes are achieved along the outer edge of the upper end of the stator when excitation angle is changed , then the results are analyzed and the conclusion can be reached that 45o is the optimal excitation angle. Finally, a photo of the stator prototype is presented.
Authors: M. Shafik, L. Makombe
Abstract: This paper presents a rotary standing wave ultrasonic motor using single flexural vibration ring transducer. The motor consists of three main components, the stator, rotor and housing unit. The stator is a piezoelectric transducer ring. The rotor is designed of a compact driving wheel and shaft. The housing unit is made of a transparent thermoplastic Perspex material and is part of the motor working mechanism. The motor design, structure, working principles and modelling using finite element analysis is discussed and presented in this paper. A prototype of the motor was fabricated and its characteristics measured. Experimental tests showed that the motor electrical working parameters are: Current: 100 m-amps, Voltage: 100 volts, Frequency: 41.7 kHz, typical speed of 32 revolutions per minute, a resolution of less than 50μm and maximum load of 1.5 Newton.
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