scholarly journals Design and Simulation of Novel 3-DOF Spherical Voice Coil Motor

Actuators ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 155
Author(s):  
Yi-Hsuan Lin ◽  
Chien-Sheng Liu ◽  
Chiu-Nung Yeh
Keyword(s):  
Lorentz Force ◽  
Large Volume ◽  
Power Efficiency ◽  
Voice Coil Motor ◽  
Response Speed ◽  
Commercial Software ◽  
Suitable Combination ◽  
Ring Magnet ◽  
Simulation Results ◽  
Axis Rotation

Multi-DOF motion is realized in the eyes and joints of robots mostly through the combination of multiple one-degree-of-freedom (1-DOF) motors. However, this results in reduced efficiency, a large volume, reduced response speed, and inaccurate positioning. To solve these problems, this study proposes a novel 3-DOF spherical voice coil motor (VCM). In this VCM, 16 coils and a radially oriented ring magnet are used to generate a Lorentz force to achieve motion. In particular, coils for Z-axis rotation are sandwiched between the coils for X- and Y-axis rotation. Furthermore, the proposed VCM can achieve 360° rotation about the Z-axis. The commercial software ANSYS was used to design and verify the performance of the proposed VCM. Simulation results indicate that this VCM affords improved power efficiency because only a suitable combination of coils, rather than all coils, needs to be powered on. The results demonstrate the feasibility of the proposed 3-DOF spherical VCM.

Design Technique of High Power Efficiency LLC DC-DC Converters for Photovoltaic Cells

2018 ◽  
Vol 2 (1) ◽  
pp. 30
Author(s):  
Hisatsugu Kato ◽  
Yoichi Ishizuka ◽  
Kohei Ueda ◽  
Shotaro Karasuyama ◽  
Atsushi Ogasahara
Keyword(s):  
High Power ◽  
Power Efficiency ◽  
Photovoltaic Cells ◽  
Input Voltage ◽  
Design Technique ◽  
Load Range ◽  
Voltage Range ◽  
Simulation Results ◽  
Secondary Side ◽  
High Power Efficiency

This paper proposes a design technique of high power efficiency LLC DC-DC Converters for Photovoltaic Cells. The secondary side circuit and transformer fabrication of proposed circuit are optimized for overcoming the disadvantage of limited input voltage range and, realizing high power efficiency over a wide load range of LLC DC-DC converters. The optimized technique is described with theoretically and with simulation results. Some experimental results have been obtained with the prototype circuit designed for the 80 - 400 V input voltage range. The maximum power efficiency is 98 %.

scholarly journals A New Control Strategy for Bi-directional DC/DC Converter in DC Microgrid

2021 ◽  
Vol 233 ◽  
pp. 01051
Author(s):  
Tianze Miao ◽  
Xiaona Liu ◽  
Siyuan Liu ◽  
Lihua Wang
Keyword(s):  
Steady State ◽  
Control Strategy ◽  
Feedback Linearization ◽  
Sliding Mode ◽  
Response Speed ◽  
Fast Response ◽  
Sliding Mode Controller ◽  
Exponential Approximation ◽  
Dc Microgrid ◽  
Simulation Results

The bi-directional DC / DC converter in DC microgrid is a typical nonlinear system which has large voltage disturbance during lead accumulator charging and discharging. In order to solve the problem of voltage disturbance, the linearization of the converter is realized by exact feedback linearization, and the sliding mode controller is designed by using exponential approximation law. The simulation results show that the method has fast response speed, strong anti-interference ability and good steady-state characteristics.

scholarly journals Renewable Energy Powered Plugged-In Hybrid Vehicle Charging System for Sustainable Transportation

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1944 ◽  
Author(s):  
Elangovan Devaraj ◽  
Peter K. Joseph ◽  
Thundil Karuppa Raj Rajagopal ◽  
Senthilarasu Sundaram
Keyword(s):  
Renewable Energy ◽  
High Power ◽  
Power Efficiency ◽  
Renewable Energy Sources ◽  
Transient State ◽  
Input Voltage ◽  
Sustainable Transportation ◽  
Battery Charging ◽  
Simulation Results ◽  
Dc Bus

Energy transformation by power electronic converters is not feasible without the efficient use of renewable energy. The article tries to extend the use of renewable energy to PHEV battery charging. In PHEV, the battery is one of the major sources of stored energy. The converter used for charging these batteries is of crucial concern. The paper addresses various challenges in designing a DC to DC converter for battery charging in DC bus. An optimized converter is designed to work with renewable energy sources to accomplish a high boost ratio, low input current ripple, low output voltage ripple, high power efficiency, and high power density. A combination of two interleaved boost converters is effectively used with the overlap time switching to achieve a high voltage boost ratio in forming the DC bus. Transformer isolation is used to increase reliability and boost ratio further. The secondary side employs a series-connected voltage doubler. The converter boosts an input voltage of 24 V to a range of 300–400 V. Simulation results have been obtained for a 300 W system. Simulation results are validated by a prototype implementation for a 250 W system. The converter is studied and analyzed for steady-state and transient state characteristics and the power efficiency obtained is 92.9%.

Innovative AF VCM Actuator for Smart Phone Camera Module

2015 ◽  
Author(s):  
Chien-Sheng Liu ◽  
Hong-Fei Li ◽  
Min-Kai Lee
Keyword(s):  
Permanent Magnet ◽  
Simulation Analysis ◽  
Smart Phone ◽  
Voice Coil Motor ◽  
Industrial Applications ◽  
Experimental Results ◽  
Compression Force ◽  
Commercial Software ◽  
Electromagnetic Structure ◽  
Promising Solution

In the present study, we propose an innovative autofocusing (AF) voice coil motor (VCM) actuator to replace the traditional AF VCM actuators with springs for smart phone camera modules. In the proposed electromagnetic structure, the magnetic pre-compression force between the two guide rods and permanent magnet is used to replace the restoring resilience force of the two springs in the traditional AF VCM actuators. The proposed AF VCM actuator is characterized numerically using the simulation analysis of commercial software Infolytica MagNet and then verified experimentally using a laboratory-built prototype. The experimental results presented in this study show compared to traditional AF VCM actuator, the proposed AF VCM actuator has excellent AF performance to be able to replace the traditional AF VCM actuators. As a result, the proposed device provides a promising solution for smart phone camera modules or industrial applications.

scholarly journals Design of Stable Controller for Flexible Solar Panel by H∞ Loop-Shaping Method

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Dini Wang ◽  
Fanwei Meng ◽  
Shengya Meng ◽  
Aiping Pang
Keyword(s):  
Essential Role ◽  
Weighting Function ◽  
Control Design ◽  
Response Speed ◽  
Solar Panel ◽  
Flexible Systems ◽  
Solar Panels ◽  
Control Precision ◽  
Loop Shaping ◽  
Simulation Results

Flexible solar panels play an essential role in the field of aerospace. However, many difficulties appear in the control design due to the existence of a weakly damped resonance module. The design for flexible systems often causes an unstable controller so that the systems after design still have trouble in putting into practice. We adopt H∞ loop-shaping design and put forward a directive method for selecting the weighting function. The simulation results indicate that system bandwidth is optimized based on the stable controller. In this way, the control precision and response speed of the system are improved. In the meantime, the system is easy to put into use.

An Improved Triangle Centroid Localization Algorithm Based on PIT Criterion

2020 ◽  
Author(s):  
Mao Li ◽  
Feng Jiang ◽  
Cong Pei
Keyword(s):  
Response Speed ◽  
Estimation Algorithm ◽  
Localization Algorithm ◽  
Iterative Estimation ◽  
Localization Accuracy ◽  
Experimental Platform ◽  
Surrounding Environment ◽  
Intersection Points ◽  
Simulation Results ◽  
Communication Distance

Abstract Considering that the traditional triangle centroid localization algorithm based on RSSI is susceptible to surrounding environment, this paper improves the algorithm from two aspects of positioning accuracy and response speed also proposes an improved triangle centroid localization algorithm based on PIT criterion. Combined with actual positioning situation, the algorithm treats the calculated coordinates of the intersection points as the new beacon nodes. Thus, the area of triangle in the intersection region is reduced. Repeat positioning process until the predicted position of node is outside the triangle according to the PIT criterion. Compared with traditional triangle centroid localization algorithm, it showed from the simulation results that the improved triangle centroid localization algorithm can increase the localization accuracy up to 5 times based on the guaranteed response time when communication distance is 15 ~ 30 m, and this algorithm has higher localization accuracy and faster response speed than centroid iterative estimation algorithm in larger communication range. In additions, the experimental platform is built to verify that the proposed algorithm can effectively reduce the positioning error.

A Speculative Approach to Improve the Double Instruction Executions in the Embedded Chips

2014 ◽  
Vol 635-637 ◽  
pp. 1072-1075
Author(s):  
Xiang Zhi Lu ◽  
Hong Jun Dai ◽  
Lei Ju
Keyword(s):  
Fault Tolerance ◽  
Power Efficiency ◽  
High Efficiency ◽  
Error Rates ◽  
Data Path ◽  
Tolerance Mechanisms ◽  
Performance Loss ◽  
Transient Errors ◽  
Transient Error ◽  
Simulation Results

Diminutive devices of present and future microprocessor generations are drawing increased attentions for transient errors. To address reliability issues, fault tolerance mechanisms must be taken into consideration. In this paper, we involve Reliability Station (RS) into modern superscalar out-of-order data path. In our proposed mechanism, each instruction in the pipeline will be executed twice and the dual results are stored in RS before they can be used. The fault detection is completed by a comparison between the two results and the recovery is achieved by re-executed the corresponding instructions. The simulation results of 12 benchmarks chosen from spec2000 and mibench show that the performance loss of our solution ranges from 30.29% to 83.32% with an average of 54.90% compared to single instruction execution, which is lower than that of Double Instruction Execution (DIE) schemes with an average of 78.42%. Meanwhile, due to the high efficiency of the recovery, our mechanism will exhibit better performance and power efficiency than DIEs within high transient error rates.

Kinematic modelling and trajectory planning for a tele-laparoscopic manipulating system

Robotica ◽  
2000 ◽  
Vol 18 (4) ◽  
pp. 347-360 ◽  
Author(s):  
Ali Faraz ◽  
Sharam Payandeh
Keyword(s):  
Trajectory Planning ◽  
Inverse Kinematics ◽  
Motion Simulation ◽  
Typical Trajectory ◽  
Straight Line ◽  
Kinematic Modelling ◽  
Fixed Axis ◽  
Simulation Results ◽  
Axis Rotation ◽  
Laparoscopic Tools

This paper addresses the kinematic modelling, solutions and trajectory planning of a tele-laparoscopic manipulator. This type of manipulator can be used in remote positioning of laparoscopic tools through tele-operating system. Specifically the paper models kinematics of a typical manipulating system which can be used in such tele-surgery. Inverse kinematics solutions are also obtained for two kinematically constraint motions which are part of a typical trajectory of the laparoscopic tools. These are fixed axis rotation of the tool and its straight line motion. Simulation results are presented to demonstrate the validity of such models and solutions.

Computational Fluid Dynamics Study of a Small Vertical Axis Wind Turbine with Ball-Shaped Blades

2011 ◽  
Vol 347-353 ◽  
pp. 319-322
Author(s):  
Zu Peng Zhou ◽  
Qiu Yun Mo ◽  
Zhi Peng Lei
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Turbine ◽  
Power Efficiency ◽  
Vertical Axis ◽  
Curvature Radius ◽  
Dynamics Analysis ◽  
Vertical Axis Wind Turbine ◽  
Computational Fluid Dynamics Analysis ◽  
Simulation Results

The computational fluid dynamics analysis of a small vertical axis wind turbine with ball-shaped blades has been done in this paper. First, a three-dimensioned model of the wind turbine with the ball-shaped blades has been constructed by using the software of FLUENT 6.3. Then, by giving the size parameters and shape parameters of the blades, the simulation has been done and the corresponding simulation results have been obtained. The contuours of static pressure around the wind blade area has been shown. The simulated model and the results can be used for finding the factors which will affect the power efficiency of this type of wind turbine in the future. Finally, the simulation results of the blade with zero curvature radius and curvature radius of 2 are shown and compared in order to demonstrate the effectiveness of this computational fluid dynamics analysis method. It can be concluded that the blades with curvature of 2 can obtain more toruqe comparing with the zero one and it would be the more suitable option in the blade design.

Design and Simulation of a Parylene-Based Three-Dimensional Cuff Electrode for Peripheral Nerve Stimulation

2014 ◽  
Vol 609-610 ◽  
pp. 1459-1463
Author(s):  
Wen Jie Xiong ◽  
Huai Qiang Yu ◽  
Zhi Hong Li
Keyword(s):  
Peripheral Nerve ◽  
Nerve Stimulation ◽  
Power Efficiency ◽  
Three Dimensional ◽  
Element Model ◽  
Peripheral Nerve Stimulation ◽  
Cuff Electrode ◽  
Higher Power ◽  
Simulation Results ◽  
Stimulation Of

In this paper, a parylene-based three-dimensional cuff electrode for peripheral nerve stimulation was proposed and simulated. The three-dimensional (3D) finite element model was built for simulation study of the electrode. The simulation results show this design has higher power efficiency than conventional planar electrode and it can realize selective stimulation of different fascicles in the target nerve. Moreover, the tripolar configuration has better control of the stimulation electric field than monopolar.

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