An Electromechanical Integrated Harmonic Piezodrive System

An electromechanical integrated harmonic piezodrive system is proposed. The key of the proposed piezodrive system is the integration of the piezodrive principle with the harmonic drive and the movable tooth drive principles, which changes the sliding friction between the rotor and the vibrator into a rolling mesh. It can substantially increase the system's output torque, operating life, and efficiency. In this paper, the design of the drive system and its operating principles are presented. Under piezoelectric excitation, the deformation energy of the flexible ring was analyzed and the output torque of the drive system was calculated, revealing that the drive system produces a higher output torque than does a normal bar-type ultrasonic motor.

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Dynamic Displacements for Electromechanical Integrated Electrostatic Harmonic Drive

Journal of Computational and Nonlinear Dynamics ◽

10.1115/1.2908352 ◽

2008 ◽

Vol 3 (3) ◽

Cited By ~ 1

Author(s):

Lizhong Xu ◽

Lei Qin

Keyword(s):

Natural Frequencies ◽

Dynamic Performance ◽

Three Dimensional ◽

Frequency Equation ◽

Drive System ◽

Harmonic Drive ◽

Electromechanical Integrated ◽

Analysis Package ◽

Design And Manufacture ◽

Flexible Ring

The electromechanical integrated electrostatic harmonic drive is a new drive system invented by authors. The dynamic displacements of the flexible ring for the drive have important influence on operating performance of the drive system. In this paper, the three dimensional dynamic equations for the drive system are presented. The mode function equations and the frequency equation for the drive system are derived. The natural frequencies and dynamic displacements of the drive system are obtained. Using a finite element method analysis package, ANSYS, the natural frequencies and vibrating modes of the flexible ring for the drive system are simulated. The simulation results are compared to the analytical results above. The research is useful in design and manufacture of the drive system and can be used to design dynamic performance of the drive.

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Movement Mechanism Analysis of Electromechanical Worm Drive

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.490-495.432 ◽

2012 ◽

Vol 490-495 ◽

pp. 432-436

Author(s):

Xue Mei Guan ◽

Li Zhong Xu

Keyword(s):

Mechanism Analysis ◽

Harmonic Drive ◽

Theoretic Analysis ◽

Output Torque ◽

Moment Distribution ◽

Electromechanical Integrated ◽

Movement Mechanism ◽

System Output ◽

Worm Drive ◽

Electromechanical Coupled

In this study, an electromechanical integrated electromagnetism worm drive is proposed and its operating principle is introduced. The equations of electromechanical coupled force and the systematic output torque for the drive are given by means of electromagnetism harmonic drive and permanent magnet worm drive transmission principle . By using an example to analysis the system output moment distribution. This paper lays the theoretic foundation for deeper theoretic analysis on drive and manufacture technologies study.

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Effects of molecule force on free vibration for a micro electromagnetic harmonic drive system

Mechanics & Industry ◽

10.1051/meca/2021008 ◽

2021 ◽

Vol 22 ◽

pp. 12

Author(s):

Dan Zhao ◽

Lizhong Xu ◽

Yuming Fu

Keyword(s):

Free Vibration ◽

Lower Order ◽

Natural Frequencies ◽

Van Der Waals ◽

Drive System ◽

Van Der Waals Force ◽

Vibration Modes ◽

Harmonic Drive ◽

Force Dynamics ◽

Flexible Ring

In this paper, a micro electromagnetic harmonic drive system is proposed. Considering Van der Waals force, dynamics equation of the flexible ring for the micro drive system is deduced and resolved. Using the equations, the effects of the molecule force on the natural frequencies and vibration modes of the drive system are investigated. Results show that considering molecule force, natural frequencies of the flexible ring are reduced and its vibration modes are changed. For lower order modes, smaller clearance between the flexible ring and stator, smaller thickness of the flexible ring and larger radius of the flexible ring, the effects of the molecule force on the natural frequencies and vibration modes are more obvious.

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Forced Response of Electromechanical Integrated Electrostatic Harmonic Drive to Voltage Excitation

First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B ◽

10.1115/mnc2007-21024 ◽

2007 ◽

Author(s):

Lizhong Xu ◽

Cuirong Zhu ◽

Lei Qin ◽

Yanling Zao

Keyword(s):

Forced Response ◽

Drive System ◽

Harmonic Drive ◽

Frequency Responses ◽

Electromechanical Integrated ◽

Generalized Force ◽

Electric Field Force ◽

Exciting Voltage ◽

Generalized Coordinate ◽

Electromechanical Coupled

In this paper, a micro electromechanical integrated electrostatic harmonic drive system is presented. The operating principle of the MEMS is introduced. The exciting electric field force under exciting voltage is given. Based on the electromechanical coupled dynamic equations of the drive system, by generalized force and generalized coordinate, the forced response of the drive system to voltage excitation are obtained. The forced frequency responses of the drive system to voltage excitation are investigated. Changes of the frequency response along with the system parameters are given as well.

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Torque and displacement for a micro electromagnetic harmonic drive system

Forschung im Ingenieurwesen ◽

10.1007/s10010-021-00438-1 ◽

2021 ◽

Vol 85 (1) ◽

pp. 139-151

Author(s):

Dan Zhao ◽

Yuming Fu ◽

Lizhong Xu

Keyword(s):

Drive System ◽

Harmonic Drive

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Output Torque for Electromagnetic Harmonic Drive

Advances in Mechanical Engineering ◽

10.1155/2014/721543 ◽

2014 ◽

Vol 7 (2) ◽

pp. 721543 ◽

Cited By ~ 3

Author(s):

Lizhong Xu ◽

Yongli Liang

Keyword(s):

Harmonic Drive ◽

Output Torque

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Nonlinear Forced Response of Electromechanical Integrated Toroidal Drive to Coupled Excitation

The Scientific World JOURNAL ◽

10.1100/2012/743138 ◽

2012 ◽

Vol 2012 ◽

pp. 1-10

Author(s):

Lizhong Xu ◽

Fen Wang

Keyword(s):

Natural Frequencies ◽

Forced Response ◽

Drive System ◽

Mesh Stiffness ◽

Electric Excitation ◽

Time Period ◽

Electromechanical Integrated ◽

Exciting Frequency ◽

Mesh Parameter ◽

Forced Responses

The electric excitation and the parameter excitation from mesh stiffness fluctuation are analyzed. The forced response equations of the drive system to the coupled excitations are presented. For the exciting frequencies far from and near natural frequencies, the forced responses of the drive system to the coupled excitations are investigated. Results show that the nonlinear forced responses of the drive system to the coupled excitations change periodically and unsteadily; the time period of the nonlinear forced responses depends on the frequencies of the electric excitation, the mesh parameter excitation, and the nonlinear natural frequencies of the drive system; in order to improve the dynamics performance of the drive system, the frequencies of the electric excitations should not be taken as integral multiple of the mesh parameter exciting frequency.

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A Self-Actuating Traction-Drive Speed Reducer

Journal of Mechanical Design ◽

10.1115/1.1897410 ◽

2004 ◽

Vol 127 (4) ◽

pp. 631-636 ◽

Cited By ~ 8

Author(s):

Donald R. Flugrad ◽

Abir Z. Qamhiyah

Keyword(s):

Friction Coefficient ◽

Normal Force ◽

Drive System ◽

Traction Drive ◽

Sliding Motion ◽

Output Torque ◽

Speed Reducer ◽

Rolling Elements ◽

Drive Speed ◽

High Output

Traction-drive speed reducers offer certain advantages over geared speed reducers. In particular, they generally run quieter than geared units and provide an opportunity for higher efficiency by eliminating sliding motion between contacting elements. In order to generate a sufficiently high output torque, some means must be provided to create a normal force between the rolling elements. This normal force, along with the friction coefficient, enables the device to transmit torque from one rolling member to the next. The speed reducer proposed here is designed so that the configuration of the rolling elements creates the needed normal force in response to the torque exerted back on the system by the downstream loading. Thus the device is self-actuating. Since the normal force is only present when needed, the rolling elements of the device can readily be disengaged, thus eliminating the need for a separate clutch in the drive system. This feature can be exploited to design a transmission with several distinct speed ratios that can be engaged and disengaged in response to changing speed requirements.

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