scholarly journals Optimization of VFD Operations for Transporting Equipment of Packages

2021 ◽  
Vol 27 (1) ◽  
pp. 4-11
Author(s):  
Lione Urmoniene ◽  
Jelena Dikun ◽  
Jolanta Januteniene
Keyword(s):  
Electricity Consumption ◽  
Experimental System ◽  
Rotation Frequency ◽  
Total Efficiency ◽  
System Efficiency ◽  
Periodic Mode ◽  
Servo Drive ◽  
Variable Frequency Drive ◽  
Linear Speed ◽  
Drive Motor

This study is focused on the efficiency of automated transferring system of packages equipped by variable-frequency drive (VFD) and servo drive motor. It was found that rotation frequency of induction motors and linear speed of servo drive decisively affected the unit efficiency that operates in the periodic mode. The system duty cycle was divided in two separate parts taking into account time spans needed to complete the specific tasks by each separate equipment of the system. In order to reduce the power usage of the system, the duration of each part of cycle was extended. Lowered electricity consumption leads to the extension of each cycle’s stage operating times. Frequencies of motors and linear speed of servo drive motors were optimized depending on cycle stages duration. Optimized frequency and linear speed values were calculated and loaded into motors controllers, and the efficiency of each separate equipment was measured, as well as total efficiency of the system. Experimental system debugging using optimized parameters proved that system efficiency increases up to 60 %, and that is closely matched with calculated values.

scholarly journals Improving the Autonomy of a Mid-Drive Motor Electric Bicycle Based on System Efficiency Maps and Its Performance

2021 ◽  
Vol 12 (2) ◽  
pp. 59
Author(s):  
Ivan Arango ◽  
Carlos Lopez ◽  
Alejandro Ceren
Keyword(s):  
Energy Consumption ◽  
Management Strategy ◽  
Computational Analysis ◽  
Experimental Models ◽  
System Efficiency ◽  
Drive Motor ◽  
Electric Bicycle ◽  
Chain Transmission ◽  
Battery Energy ◽  
Efficiency Map

Around the world, the e-bike has evolved from a recreational and sports object to an increasingly used means of transportation. Due to this, improving aspects such as range and energy efficiency has become very relevant. This article presents experimental models for the components’ efficiency of a mid-drive motor e-bike (charger; battery; and controller, motor, and reduction gears subsystem), and integrates them with previously elaborated models for the chain transmission system, thus generating an overall efficiency map of the e-bike. The range of the electric bicycle is analyzed by integrating the efficiency map of the system and its performance mathematical model, aiming to determine the per unit of distance battery energy consumption. The above-mentioned calculations are applied to develop a management strategy that can determine the optimal assistance level and chain transmission ratio, maximizing range and leaving speed unaffected. The driving strategy was compared against other driving techniques using computational analysis, this allowed for the observation of the proposed strategy improving the system’s range by reducing the battery energy consumption.

scholarly journals Processing of Superfine and Ultrafine Phosphate of a Phosphomud (Part Two)

2019 ◽  
Vol 9 (2) ◽  
pp. 102
Author(s):  
Suzan S. Ibrahim ◽  
Khaled E. Yassin ◽  
Tawfik R. Boulos
Keyword(s):  
Ultrafine Particles ◽  
Feeding Rate ◽  
Separation Efficiency ◽  
Water Pressure ◽  
Rotation Frequency ◽  
Variable Frequency Drive ◽  
Phosphate Industry ◽  
Irreversible Effect ◽  
Mineral Industries ◽  
Central Composite

Mineral industries in common generate a lot of rejects in the form of fines and slimes, which ultimately create environmental and social problems besides causing losses of mineral values. In view of the recent stringent policy imposed on the environment, there is an urgent need to attempt possible simple and cheap solutions to such problems. These slimes have long been considered in the industry to be unrecoverable. It has been standard practice over many years in the phosphate industry to separate and discard the fines and ultrafine particles. In this respect, the present study shed light on the recovery of super and ultrafine phosphate of a phosphomud produced after the processing of an East Mediterranean phosphate ore. Falcon Concentrator model SB40-VFD (semi-continuous with variable frequency drive) was used in this study to recover the -32 micron phosphate fines of D50=11 micron. The effect of the main variables of the semi-continuous Falcon concentrator model SB40-VFD, including the bowl rotation frequency Hz, the fluidizing water pressure psi, and feeding rate g/min on the separation efficiency were followed up. In addition, two feeding modes based on a particle size-by-size were tried in this study: The sample was fed as a global -32 micron sample or as two fractions, -32+11 micron, and -11 micron samples. Central Composite Rotatable Design (CCRD) was applied on the Falcon separation of the -11 micron fraction with D50 < 3 micron alone to model and optimize the separation process for the two responses: the recovered phosphate grade and recovery. Results showed that the phosphate fines containing 14.73% P2O5, 15.03% acid insoluble, and 19.07% loss in ignition was recovered with grade and P2O5 recovery reaching 28.29%, and 95.97% in case of separating the overall -32 micron sample as one feed. In case of the fractionated feeding samples, the total grade and recovery reached 29.21%, and 88.42%, respectively. The application of the CCRD results showed that the bowl rotation frequency showed to have the main irreversible effect on the product grade, where the fluidizing water pressure had the main reversible effect on the recovery. On the other hand, feeding rate showed some effect on the product grade with almost no effect on its P2O5 recovery%.

scholarly journals Technico-Economic Study of a Photovoltaic Pumping System Using a Variable-Frequency Drive Converter

2021 ◽  
Vol 229 ◽  
pp. 01017
Author(s):  
L. Elmahni ◽  
K. Assalaou ◽  
E. Aitiaz ◽  
B. Benachir ◽  
L. Bouhouch
Keyword(s):  
Comparative Study ◽  
Meteorological Data ◽  
The Other ◽  
Variable Frequency ◽  
System Efficiency ◽  
Economic Study ◽  
Variable Frequency Drive ◽  
Tracking Technique ◽  
Pumping System ◽  
Maximum Power Tracking

This paper presents a technical-economic study of a photovoltaic pumping system using an inverter with a Variable Frequency Drive (VFD) to improve system efficiency. We propose a comparative study between two pumping station projects located in places very close to each other, in order to consider that they are exposed to the same meteorological data. One of the projects has the maximum power tracking technique (MPPT), while the other project does not have this technique. The study will compare the various experimental surveys carried out in the field with modeling results using Matlab Simulink.

scholarly journals Fuel Utilization Effects on System Efficiency and Solid Oxide Fuel Cell Performance in Gas Turbine Hybrid Systems

2017 ◽  
Author(s):  
Nor Farida Harun ◽  
Lawrence Shadle ◽  
Danylo Oryshchyn ◽  
David Tucker
Keyword(s):  
Fuel Cell ◽  
Gas Turbine ◽  
Hybrid Systems ◽  
Cell Length ◽  
Inlet Temperature ◽  
Total Efficiency ◽  
Total System ◽  
System Efficiency ◽  
Fuel Utilization ◽  
Fuel Cell Performance

The simulation work presented herein characterizes the performance of a recuperated gas turbine (GT) hybrid systems in response to different levels of fuel utilization (Uf) by the SOFC. The SOFC performance was compared with and without anode recycle (AR), operating at 90% total stack Uf (Uf.stack). A study at 65% Uf was also considered as a reference case for the hybrid power system without anode recycle, i.e. using single-pass cell fuel utilization (Uf.cell). All three cases in this paper were evaluated at design points for a 550 MW hybrid system using coal-derived syngas feed with zero methane. A previously developed one-dimensional (1D) fuel cell model was used to simulate the distributed profile of thermal and electrochemical properties along the fuel cell length. Fuel cell total current density, average solid temperature, and cathode inlet temperature were maintained identical at each fuel utilization to avoid confounding the results with the impacts of SOFC degradation. The maximum system efficiency of 71.1% was achieved by SOFC/GT non-recycle systems at 90% Uf.cell (with 90% Uf.stack). The case at 65% Uf.cell (with 65% Uf.stack) demonstrated 70.7% total efficiency, only 0.4% point lower than at 90% Uf.cell. However, integrating anode recycle to the system significantly reduced the maximum total efficiency to 55.5%. Although the distributed SOFC performance across the cell length for 65% Uf.cell with AR at 90% Uf.stack was similar to the 65% Uf.cell (with 65% Uf.stack), recycling anode off-gas resulted in lower fuel cell Nernst potential that caused further drop in both stack and total system efficiency.

scholarly journals Design and Simulation of a Servo-Drive Motor Using ANSYS Electromagnetics

2021 ◽  
Vol 60 (3) ◽  
pp. 112-123
Author(s):  
Vladyslav Pliuhin ◽  
Oleksandr Aksonov ◽  
Yevgen Tsegelnyk ◽  
Sergiy Plankovskyy ◽  
Volodymyr Kombarov ◽  
...  
Keyword(s):  
Software Package ◽  
Motor Performance ◽  
Permanent Magnets ◽  
Synchronous Machines ◽  
Servo Drive ◽  
Three Phase ◽  
Drive Motor ◽  
Complete Set ◽  
Simulation Results ◽  
Necessary And Sufficient

The paper is devoted to determining the output parameters of a servomotor, which belongs to synchronous machines with permanent magnets, in order to further determine the characteristics of transient modes in the software package ANSYS Electromagnetics. RMxprt, part of ANSYS Electromagnetics, allows to determine the parameters of windings, losses, motor performance, but requires filling out a form with a complete set of geometric dimensions and winding data. Of course, such data are not available in the motor data sheet, so the first task solved in the paper is to determine all the necessary and sufficient parameters to perform the calculation in RMxprt. The results of the calculations were compared with the measurements on the experimental servomotor EMG-10APA22. This paper shows how to export a servomotor object from RMxprt to the Simplorer workspace, which is also part of the ANSYS Electromagnetics. According to the simulation results in ANSYS Simplorer, the characteristics of the transient modes of the servomotor powered by a stable three-phase source are obtained. Prospects for further research related to the improvement of the simulation model in ANSYS Simplorer are presented.

Design of Live Evaluation System of Organic Materials Aging

2013 ◽  
Vol 321-324 ◽  
pp. 245-251
Author(s):  
Lei Shao ◽  
He Ming Zhao ◽  
Yi Biao Yu ◽  
Tao Liu
Keyword(s):  
Adverse Effect ◽  
Mechanical System ◽  
Evaluation System ◽  
Organic Materials ◽  
Force Sensor ◽  
Servo Drive ◽  
Detection Circuit ◽  
Drive Motor

Organic materials (cable particularly) aging has an adverse effect on the safety of productionsituations, and it is unscientific to replace organic materials blindly. A live evaluation system of organicmaterials aging was developed in present paper. This system consists of control and detection circuit(composed by ARM chip S3C6410 and force sensor, etc.) and servo drive motor. Compressivemodulus of organic materials was tested by the system with the help of mechanical system, so as toevaluate the cable aging.

scholarly journals Application of Genetic Algorithms Technique in the Generation of Academic Schedules

2020 ◽  
Author(s):  
Jason Gómez ◽  
Gloria Arcos-Medina ◽  
Danilo Pástor
Keyword(s):  
Genetic Algorithms ◽  
Objective Function ◽  
Resource Utilization ◽  
Educational Institution ◽  
Total Efficiency ◽  
Development Phase ◽  
Time Behavior ◽  
System Efficiency ◽  
Low Efficiency ◽  
Metaheuristic Techniques

This paper presents an application to solve the problem of low efficiency in the generation of academic schedules for an educational institution through metaheuristic techniques. The agile SCRUM methodology was used for the planning and development of the system, in addition a sample of four processes for the evaluation of system efficiency was determined. In the planning phase, 15 user stories, 13 technical stories and 19 system sprints were identified. In the development phase the design of the architecture, interfaces, database was carried out. The process for working the genetic algorithms in the generation of schedules through the processes of initialization, selection, crossing, mutation and recombination was carried out until compliance with an objective function thus obtaining an academic schedule with the conditions that the educational institution requires. To evaluate the efficiency of the system, the ISO/ IEC 25010 standard was used through the sub-characteristics of time behavior and resource utilization. The results obtained in time behavior reveal that with the use of the system it is reduced by 99.12%, compared to the manual processes thus showing a total efficiency of 93.75%. Resumen. Este trabajo presenta una aplicación para resolver el problema de la poca eficiencia en la generación de horarios académicos para una institución educativa    a través de técnicas metaheurísticas. Se utilizó la metodología ágil SCRUM para la planificación y desarrollo del sistema, además se determinó una muestra de cuatro procesos para la evaluación de eficiencia del sistema. En la fase de planificación se identificaron 15 historias de usuario, 13 historias técnicas y 19 sprints del sistema. En la fase de desarrollo se realizó el diseño de la arquitectura, interfaces, base de datos, además se señaló el proceso de como los algoritmos genéticos trabajan en  la generación de horarios mediante los procesos de inicialización, selección, cruce, mutación y recombinación hasta cumplir con una función objetivo obteniendo así   un horario académico con las condiciones que la institución educativa requiere.  Para evaluar la eficiencia del sistema se utilizó la norma ISO/IEC 25010 a través de las subcaracterísticas de comportamiento de tiempos y utilización de recursos. Los resultados obtenidos en cuanto a tiempos revelan que con el uso del sistema se reduce en un 99.12% en comparación a los procesos manuales, mostrando así una eficiencia total del 93.75%.

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