scholarly journals Output Torque for Electromagnetic Harmonic Drive

2014 ◽  
Vol 7 (2) ◽  
pp. 721543 ◽  
Author(s):  
Lizhong Xu ◽  
Yongli Liang
Keyword(s):  
Harmonic Drive ◽  
Output Torque

Movement Mechanism Analysis of Electromechanical Worm Drive

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.

Analysis of Harmonic Gear Drive Efficiency Based on the 3D Simplified Model

2014 ◽  
Vol 1006-1007 ◽  
pp. 249-252
Author(s):  
Xiao Dong Wu ◽  
Meng Liang Bai ◽  
Yuan Li ◽  
Qian Hong Cao ◽  
Xiao Chen Du
Keyword(s):  
Finite Element ◽  
Rotational Speed ◽  
Transmission Efficiency ◽  
Harmonic Drive ◽  
The Finite Element Method ◽  
Gear Drive ◽  
Output Torque ◽  
Transmission Design ◽  
Finite Element Numerical Simulation ◽  
And Performance

This study based on the finite element method, the type of XB1-120-100 harmonic drive output torque and input rotational speed impact on transmission efficiency has been analyzed. The results show that the efficiency of harmonic gear drive increases with the output torque increased, and it has no relation with input rotational speed. When the output shaft takes the value of rated torque (Tout=450Nm), the transmission efficiency of harmonic gear drive obtained by the finite element numerical simulation is 87.1%. This value of transmission efficiency is quite close to the type of XB1-120-100 harmonic drive efficiency (75%-90%). The above analysis method and results have a guiding significance for the transmission design and performance analysis of harmonic gear drive.

scholarly journals Global Sensitivity Analysis of Chosen Harmonic Drive Parameters Affecting Its Lost Motion

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5057
Author(s):  
Slavomir Hrcek ◽  
Frantisek Brumercik ◽  
Lukas Smetanka ◽  
Michal Lukac ◽  
Branislav Patin ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Global Sensitivity Analysis ◽  
Important Variable ◽  
Design Parameters ◽  
Harmonic Drive ◽  
Global Sensitivity ◽  
Output Torque ◽  
Wave Generator ◽  
Spline Finite Element ◽  
Geometry Parameter

The aim of the presented study was to perform a global sensitivity analysis of various design parameters affecting the lost motion of the harmonic drive. A detailed virtual model of a harmonic drive was developed, including the wave generator, the flexible ball bearing, the flexible spline and the circular spline. Finite element analyses were performed to observe which parameter from the harmonic drive geometry parameter group affects the lost motion value most. The analyses were carried out using 4% of the rated harmonic drive output torque by the locked wave generator and fixed circular spline according the requirements for the high accuracy harmonic drive units. The described approach was applied to two harmonic drive units with the same ratio, but various dimensions and rated power were used to generalize and interpret the global sensitivity analysis results properly. The most important variable was for both harmonic drives the offset from the nominal tooth shape.

An Electromechanical Integrated Harmonic Piezodrive System

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Lizhong Xu ◽  
Huaiyong Li
Keyword(s):  
Sliding Friction ◽  
Deformation Energy ◽  
Ultrasonic Motor ◽  
Drive System ◽  
Harmonic Drive ◽  
Operating Life ◽  
Output Torque ◽  
Electromechanical Integrated ◽  
Flexible Ring

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.

Torque and displacement for a micro electromagnetic harmonic drive system

2021 ◽  
Vol 85 (1) ◽  
pp. 139-151
Author(s):  
Dan Zhao ◽  
Yuming Fu ◽  
Lizhong Xu
Keyword(s):  
Drive System ◽  
Harmonic Drive

scholarly journals Research on aerodynamic characteristics of two-stage axial micro air turbine spindle for small parts machining

2020 ◽  
Vol 12 (12) ◽  
pp. 168781402098437
Author(s):  
Liu Jiang ◽  
Guo Zhiping ◽  
Miao Shujing ◽  
He Xiangxin ◽  
Zhu Xinyu
Keyword(s):  
High Speed ◽  
Aerodynamic Characteristics ◽  
Maximum Efficiency ◽  
Two Stage ◽  
Output Torque ◽  
Air Turbine ◽  
Solid Foundation ◽  
Computational Fluid Dynamics Cfd ◽  
Micro Machine ◽  
Small Parts

In order to meet the requirements of output torque, efficiency and compact shape of micro-spindles for small parts machining, a two-stage axial micro air turbine spindle with an axial inlet and outlet is proposed. Based on the k-ω turbulence model of SST, the flow field and operation characteristics of the two-stage axial micro air turbine spindle were studied using computational fluid dynamics (CFD) combined with an experimental study. We obtained the air turbine spindle under different working conditions of the loss and torque characteristics. When the inlet pressure was 300 KPa, the output speed of the two-stage turbine was 100,000 rpm, 9% higher than that of a single-stage turbine output torque. The total torque reached 6.39 N·mm, and the maximum efficiency of the turbine and the spindle were 42.2% and 32.3%, respectively. Through the research on the innovative structure of the two-stage axial micro air turbine spindle, the overall performance of the principle prototype has been significantly improved and the problems of insufficient output torque and low working efficiency in high-speed micro-machining can be solved practically, which laid a solid foundation for improving the machining efficiency of small parts and reducing the size of micro machine tool.

Novel active magnetorheological knee prosthesis presents low energy consumption during ground walking

2021 ◽  
pp. 1045389X2098392
Author(s):  
Rafhael Milanezi de Andrade ◽  
Jordana Simões Ribeiro Martins ◽  
Marcos Pinotti ◽  
Antônio Bento Filho ◽  
Claysson Bruno Santos Vimieiro
Keyword(s):  
Energy Consumption ◽  
Stance Phase ◽  
Gait Cycle ◽  
Dynamic Models ◽  
Knee Prosthesis ◽  
Regenerative Braking ◽  
Harmonic Drive ◽  
Low Energy Consumption ◽  
Energetic Expenditure ◽  
Over Ground Walking

This study analyses the energy consumption of an active magnetorheological knee (AMRK) actuator that was designed for transfemoral prostheses. The system was developed as an operational motor unit (MU), which consists of an EC motor, a harmonic drive and a magnetorheological (MR) clutch, that operates in parallel with an MR brake. The dynamic models of the MR brake and MU were used to simulate the system’s energetic expenditure during over-ground walking under three different working conditions: using the complete AMRK; using just its motor-reducer, to operate as a common active knee prosthesis (CAKP), and using just the MR brake, to operate as a common semi-active knee prosthesis (CSAKP). The results are used to compare the MR devices power consumptions with that of the motor-reducer. As previously hypothesized, to use the MR brake in the swing phase is more energetically efficient than using the motor-reducer to drive the joint. Even if using the motor-reducer in regenerative braking mode during the stance phase, the differences in power consumption among the systems are remarkable. The AMRK expended 16.3 J during a gait cycle, which was 1.6 times less than the energy expenditure of the CAKP (26.6 J), whereas the CSAKP required just 6.0 J.

On a Gearing Problem in Conventional Harmonic Drives With Involute Toothed Gear Set

2011 ◽  
Author(s):  
Bikash Routh ◽  
Rathindranath Maiti
Keyword(s):  
Applied Load ◽  
Harmonic Drive ◽  
Strain Wave ◽  
Base Circle ◽  
Pitch Curve

Circular pitches of flex spline teeth of a ‘Strain Wave Gearing’, also known as a ‘Harmonic Drive’, are deformed when the Strain Wave Generating Cam is inserted into the flex spline cup. In the present work the deformed pitch distances considering that flex spline teeth remain rigid while the rim deforms, are estimated. No applied load is considered. It is also shown that if the cam is elliptical then the pitch curve is not an ellipse and vice versa. Geometries of such curves can be defined following the analysis presented in this paper. Cases of both undeformed flex spline with circular spline and deformed flex spline with circular spline, with involute teeth, are considered to find out tooth positions. Geometries of involute teeth profiles in mesh are examined and compared considering oval shaped (on deformation) base drum of flex spline where as base circle of circular spline remained circular.

Evidence of secondary tooth contact in harmonic drive, with involute toothed gear pair, through experimental and finite element analyses of stresses in flex-gear cup

2016 ◽  
Vol 232 (2) ◽  
pp. 341-357 ◽  
Author(s):  
Vineet Sahoo ◽  
Rathindranath Maiti
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Major Axis ◽  
Initial Stresses ◽  
Gear Pair ◽  
Ring Gear ◽  
Harmonic Drive ◽  
Strain Wave ◽  
Element Analysis ◽  
Full Load

Stresses in flex spline/gear cup in harmonic drives with involute toothed gear pair and conventional strain wave generating cam are analyzed using finite element method in ANSYS® environment and experiments. The most innovative part of this investigation is establishing the evidence of secondary contacts and probable load shared by those contacts experimentally over the finite element analysis. Aiming at the performance improvement of gearing in harmonic drives, with involute toothed gear pair, the investigations are carried out through the following analyses. (a) Initial stresses in flex gear cup due to cam insertion only. (b) Stresses in flex gear cup at no load in fully assembled harmonic drive components i.e. flex gear, ring gear, and strain wave generating cam. (c) Stresses in flex gear cup at full load passing through the two pitch points, i.e. the intersection points of ring gear pitch circle, flex gear pitch curve, and major axis on both sides. Finally, (d) stresses in flex gear cup at full load distributed over all possible primary and secondary contacts, in proportion to their contact intensities. Recorded strains of the flex-gear cup while the cam being rotated showed very good agreement with the results obtained by finite element analysis with proper modeling of loading.

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