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Journal articles on the topic 'Variable speed drive'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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1

Herák, D., V. Šleger, R. Chotěborský, K. Houška, and E. Janča. "Kinematical characteristic of mechanical frictional variable speed drive." Research in Agricultural Engineering 52, No. 2 (February 7, 2012): 61–68. http://dx.doi.org/10.17221/4881-rae.

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The paper describes a new system of mechanical spherical conical friction drive. In the present a row of simple friction, belt, chain, wave and differential variable speed drives is published. For the required range of speed variation they are altogether unfit. The currently used power transmissions are of low efficiency (60–70%). Therefore the better power transmission efficiency is required. The possibility of multicontact power transmission appears as the most suitable principle of the power transmission. Using the designed function model, which was made according to the small tractor producers requirements, the real output kinematical characteristic was measured. It is derived the complete drive conversion unit kinematics and the theoretical kinematical characteristic design. The theoretical design is compared with the real characteristic determined by measuring using the test station. From the measured values we determined that the geometrical characteristic, i.e. the relation between output speed and ring position, corresponds in the ring position range (2.8÷14) mm to the theoretical premise.

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2

Bawa, Mohd Nassurudden Bin Kader, Muhammad Mokhzaini Bin Azizan, and Shamshul Bahar Yaakob. "Application of Variable Frequency Drive (VFD) on Speed Pump." Journal of Advanced Research in Dynamical and Control Systems 11, no. 12-SPECIAL ISSUE (December 31, 2019): 843–51. http://dx.doi.org/10.5373/jardcs/v11sp12/20193284.

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3

Jeter, S. M., W. J. Wepfer, G. M. Fadel, N. E. Cowden, and A. A. Dymek. "Variable speed drive heat pump performance." Energy 12, no. 12 (December 1987): 1289–98. http://dx.doi.org/10.1016/0360-5442(87)90037-5.

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4

Oshurbekov, Safarbek, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, and Levon Gevorkov. "Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed." Applied Sciences 10, no. 24 (December 9, 2020): 8820. http://dx.doi.org/10.3390/app10248820.

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The energy efficiency of a multi-pump system consisting of two low-power (0.75 kW) pumps operating in parallel mode and a single-pump mechanism (1.5 kW) is compared in this study. For this purpose, mathematical models, experimental data, and data retrieved from the manuals provided by the pump manufacturers are used. The single-pump system is fed by a single variable speed drive. A multi-pump system running in parallel mode consists of two pumps. One of them is driven by an induction motor connected directly to the electrical grid and equipped with a throttle. Another pump is actuated by an induction motor fed by a variable speed drive. The flowrate of the liquid in the multi-pump is controlled with the help of speed variation and throttling. In the case of the single-pump system the conventional speed control method is applied during the analysis. For both pump system topologies, the daily and annual energy consumption is obtained. As a result of conducted calculations, it was shown that the multi-pump provides 29.8% savings in comparison to the single-pump system in the case of a typical flowrate profile.

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5

Xu, Ming, and Bo Jin. "Speed-Control Strategy of Energy Regulation Based Variable-Speed Electrohydraulic Drive." Applied Mechanics and Materials 336-338 (July 2013): 912–15. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.912.

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Dedicated to the disadvantage of variable-speed drive, the energy regulation based variable-speed electrohydraulic drive is proposed. It is a novel solution by adding an energy regulation device and a flow valve into the system. It combines the advantages of variable-speed drive, valve control and energy regulation. But it is a multiple-input multiple-output control system, coupled with strong nonlinear, volatility and uncertainty of some parameters, which make the control strategy complicated. The multiple-compound PID control strategy, as well as the parameter tuning rule, is proposed.

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6

Karady, G. G., S. H. Berisha, M. Muralidhar, J. A. Demcko, and M. Samotyj. "Variable speed motor drive generated magnetic fields." IEEE Transactions on Power Delivery 9, no. 3 (July 1994): 1639–46. http://dx.doi.org/10.1109/61.311199.

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7

Coninck, De, R. Reekmans, K. Hameyer, and R. Belmans. "Using Multimedia in Variable Speed Drive Teaching." EPE Journal 9, no. 3-4 (January 2000): 52–56. http://dx.doi.org/10.1080/09398368.2000.11463451.

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8

Hyvarinen, V., and J. P. Makinen. "Digital systems drive variable-speed AC motors." IEEE Computer Applications in Power 4, no. 2 (April 1991): 37–41. http://dx.doi.org/10.1109/67.75874.

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9

Linjama, Matti. "Variable speed digital hydraulic transformer–based servo drive." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 3 (August 12, 2019): 287–98. http://dx.doi.org/10.1177/0959651819869145.

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This article studies a digital hydraulic servo drive driven by a variable speed electric servomotor. Digital displacement control is implemented by using a two-port digital hydraulic power management system having six pistons and 18 on/off control valves. The first port of the digital hydraulic power management system controls the cylinder speed, while the second port is connected to a hydraulic accumulator. The peak power is taken from the accumulator, and the electric servomotor supplies only the average power into the system. An experimentally validated simulation model is used, and the results show a combination of adequate controllability and excellent energy efficiency. The estimated reduction in the size of the electric motor is 57%.

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10

Odegard, B., C. A. Stulz, and P. K. Steimer. "High-speed, variable-speed drive system in megawatt power range." IEEE Industry Applications Magazine 2, no. 3 (1996): 43–50. http://dx.doi.org/10.1109/2943.491385.

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11

Obukhova, Elena N., Vyacheslav I. Grishchenko, and Grigoriy A. Dolgov. "Formalization of dynamic model of pneumatic drive with variable structure." MATEC Web of Conferences 226 (2018): 02022. http://dx.doi.org/10.1051/matecconf/201822602022.

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The work is devoted to solving the actual technical problem of increasing the speed and accuracy of pneumatic servo drives. Pneumatic drives have a large number of advantages (high speed of the output link, environmental friendliness, low cost, etc.). But having a high compressibility of compressed air limits the possibility of realizing optimal trajectories of motion of control objects. The complexity in the organization of controlling the follow-up pneumatic drive is also introduced by a mathematical apparatus that takes into account the thermodynamic processes during the filling and emptying of the working cavities of a pneumatic cylinder. In connection with this, the goal of this work was the development of a mathematical model of a servomotor with a variable structure that takes into account the various structures of pneumatic valves with proportional control. The proposed mathematical model will make it possible to use the synergetic approach in controlling the pneumatic drive. This makes it possible to take into account not less important drive parameters such as energy efficiency, etc., with increasing speed and accuracy of the drive.

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12

Schmidt, Lasse, and Kenneth Vorbøl Hansen. "Electro-Hydraulic Variable-Speed Drive Networks—Idea, Perspectives, and Energy Saving Potentials." Energies 15, no. 3 (February 8, 2022): 1228. http://dx.doi.org/10.3390/en15031228.

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Electro-hydraulic differential cylinder drives with variable-speed displacement units as their central transmission element are subject to an increasing focus in both industry and academia. A main reason is the potential for substantial efficiency increases due to avoidance of throttling of the main flows. Research contributions have mainly been focusing on appropriate compensation of volume asymmetry and the development of standalone self-contained and compact solutions, with all necessary functions onboard. However, as many hydraulic actuator systems encompass multiple cylinders, such approaches may not be the most feasible ones with respect to efficiency or commercial feasibility. This article presents the idea of multi-cylinder drives, characterized by electrically and hydraulically interconnected variable-speed displacement units essentially allowing for completely avoiding throttle elements, while allowing for hydraulic and electric power sharing as well as the sharing of auxiliary functions and fluid reservoir. With drive topologies taking offset in communication theory, the concept of electro-hydraulic variable-speed drive networks is introduced. Three different drive networks are designed for an example application, including component sizing and controls in order to demonstrate their potentials. It is found that such drive networks may provide simple physical designs with few building blocks and increased energy efficiencies compared to standalone drives, while exhibiting excellent dynamic properties and control performance.

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13

Hasan, Md Ehtesham, K. Dasgupta, and Sanjoy Ghoshal. "Comparison of the efficiency of the high speed low torque hydrostatic drives using bent axis motor: An experimental study." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 231, no. 4 (December 11, 2015): 650–66. http://dx.doi.org/10.1177/0954408915622413.

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This article is aimed at analysing the steady-state performance of four hydrostatic drives and compares their overall efficiency. The speed of the hydrostatic drives is controlled by speed controlled vane pump, variable displacement flow compensated pump, variable displacement pressure compensated pump and proportional direction controlled valve. Bondgraph simulation technique is used to model the hydrostatic drive. The relationships of the loss coefficients with the state variables obtained from the model are identified through experimental investigation. Using them, at different torque levels, the performances of the hydrostatic drives are studied on their slips, torque losses and the overall efficiencies and they are validated experimentally. It is found that hydrostatic drive using speed controlled vane pump exhibits the maximum efficiency, whereas the poorest efficiency is shown by the valve controlled system out of the four drives considered in the analysis.

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14

Xu, Ming, and Bo Jin. "Sine Simulation of Energy Regulation Based Electrohydraulic Variable-Speed Drive." Applied Mechanics and Materials 278-280 (January 2013): 365–69. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.365.

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The variable-speed electrohydraulic drive, which can achieve similar energy efficiency as volume drive system, has some good features. But the slow response and poor low-speed performance limit the development of the variable-speed electrohydraulic drive. The energy regulation based variable-speed electrohydraulic drive is a good solution to solve these problems by adding an energy regulation device and a throttling valve into the system. The sine simulations of energy regulation based electrohydraulic variable-speed drive are carried out. The simulation results have showed that the energy regulation system can not only achieve the goal of a good response, but also keep a good energy-saving performance.

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15

Chiranga, Freeman, and Lesedi Masisi. "Variable Speed Drive DC-Bus Voltage Dip Proofing." Energies 14, no. 24 (December 8, 2021): 8257. http://dx.doi.org/10.3390/en14248257.

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This paper proposes a power electronic module that uses a switched capacitor for retaining the integrity of the dc-link voltage of a variable speed drive (VSD) during a 0.2 s short-term power interruption (STPI). Ride-through was achieved through switched capacitor onto the dc bus. However, this technique presents a challenge of the high inrush currents during a ride through compensation. In this work both analytical and experimental investigations were conducted in order to reduce the in-rush currents and its impact on the performance of the VSD during the STPI. Inrush peak currents were reduced by approximately 90%. Experimental results showed torque pulsations of 12.8% and 14.3% at the start and end of dc-link voltage compensation, respectively. A method for sizing the switched capacitor and the inrush limiting resistors is proposed. This methodology is based on the use of readily available nameplate information of the VSD and the electric motor. The proposed module can be retrofitted to existing VSDs that are based on v/f control.

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16

Hobbs, P. J., and D. H. Dalby. "Variable-speed-drive range utilising brushless synchronous motors." Power Engineering Journal 2, no. 4 (1988): 189. http://dx.doi.org/10.1049/pe:19880033.

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17

Hardy-Bishop, B. A. "Specifying large electrical variable speed-drive system installations." Power Engineering Journal 5, no. 2 (1991): 53. http://dx.doi.org/10.1049/pe:19910016.

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18

SZCZYPIŃSKI-SALA, Wojciech, Krzysztof DOBAJ, and Adam KOT. "FRICTIONAL PROBLEMS IN CONTINUOUSLY VARIABLE TRANSMISSION BELT DRIVES." Tribologia, no. 5 (October 31, 2017): 93–100. http://dx.doi.org/10.5604/01.3001.0010.5923.

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The article describes the results of the research carried out on the evaluation of the influence of friction pairs (rubber belt – belt pulley in belt drive) on the ability to transmit power. In order to determine the characteristics of the belt drive operation, measurements were made on a real belt drive from the drive train of a light two-wheeled vehicle. The measurement was carried out in conditions of changes in the dynamic load. The measurements of the belt slip on the belt pulley within the whole range of the changes of gear ratios and angular speed of the engine were made. During the tests, belts made from various rubber mixtures were compared. The values of the friction coefficients between the surface of belts and the belt pulley were measured. Model analyses of the impact of belt slip on the wheel related to the temperature of Belt drive elements were also made. Generally, one can ascertain that, in belt drive systems, power losses are a combination of speed losses and torque losses. The increase in the efficiency of belt drives is possible by decreasing power losses. It is possible to obtain the high performance of continuously variable transmission belt drives with a V- belt solely with the proper choice of the design parameters, which is possible only after the exact recognition of the operational characteristics unique to this class of belt drive systems.

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19

Strelkov, V. F., M. V. Andryushin, and V. V. Vanyev. "Power antenna radar with variable speed." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 3 (September 30, 2015): 81–87. http://dx.doi.org/10.38013/2542-0542-2015-3-81-87.

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A mathematical model of the "mains - regulated electric drive" radar antenna us with a synchronous motor with permanent magnets. Peculiarities of work at a controlled electric variable speed electric motor shaft. A method and control system with motorized adjustable mechanical and electronic scanning of the antenna, improving performance characteristics of radar stations.

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20

Kosucki, Andrzej, Łukasz Stawiński, Adrian Morawiec, and Jarosław Goszczak. "Electro-Hydraulic Drive of the Variable Ratio Lifting Device under Active Load." Strojniški vestnik – Journal of Mechanical Engineering, no. 11 (November 23, 2021): 599–610. http://dx.doi.org/10.5545/sv-jme.2021.7320.

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Hydraulic systems fed by fixed displacement pumps driven by frequency-controlled electric motors can replace conventional throttling systems due to their ability to control the speed of hydraulic cylinders regardless of the value and direction of the load. These systems can improve the energy efficiency of the drive or even provide the possibility of energy recuperation during lowering. This paper presents experimental studies of the new drive system with volumetric control of the speed of the lifted/lowered payload using the example of a scissor lift. The system uses a reversible gear pump driven by an asynchronous motor fed by a frequency inverter operating in field-oriented control mode. Comparative studies of the mapping of the assumed speed of the hydraulic cylinder and platform are presented, as well as studies of the influence of the load change on the speed and positioning of the mechanism driven by the open-loop controlled system.

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21

Al – Tahir, Ali Abdul Razzaq. "Sensorless online measurements: application to variable speed drive systems." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 1 (January 2, 2018): 29–53. http://dx.doi.org/10.1108/compel-10-2016-0453.

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Purpose Sensorless online measurements, application of variable speed drives has been given a great attention, especially over the past few years. In most of the previous literates dealing with permanent magnet synchronous motor (PMSM) drives, the combination of inter-sampled behavior with high gain design approach has not been discussed yet. This paper aims to discuss this feature in-depth. Design/methodology/approach The study contains a different approach for an observer running with surface-mounted permanent magnet synchronous machine drives to implement sensorless control. Design of sampled data observer methodology for one kind of AC machine having non-linear model and backed by an elegant formal stability convergence analysis using the tools of Lyapunov stability techniques was highly recommended in scientific contributions, and it is yet needed to be solved. Findings In this study, a solution to observation problem is covered and developed by combining ideas from the high-gain design approach and inter-sample predictor based on stator voltage measurements. The output state currents are accessible only at the sampling instant to solve the problem of states observation at continuous-time mode. This allows to reducing the usage of online appliances, improving reliability of control design and saving costs. Practical implications The proposed observer is capable of guaranteeing an acceptable closed loop dynamic response over a wide range of operation region and industrial process for random initial conditions. Originality/value The output state predictor has been interred in constructing the innovation correct term to prove the robustness of the proposed observer against attenuated sampling interval. To validate the theoretical results introduced by the main fundamental theorem and prove the observer stability convergence, the proposed observer is demonstrated through a sample study application to variable speed permanent magnet synchronous machine drive.

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22

Xu, Ming, Xiao-meng Wu, Xin Yu, and Guo-jin Chen. "Dynamic performance of auxiliary hydraulic power unit based electro-hydraulic variable speed drive system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 16 (August 24, 2017): 2926–36. http://dx.doi.org/10.1177/0954406217727770.

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Inability of dynamic performances, especially the acceleration response, strongly inhibits the application of electro-hydraulic variable speed drive, even though its intrinsic energy-saving potential. In contrast to variable speed drive, the valve-controlled actuator system shows the capacity of fast response and accurate control precision, but it consumes more energy. The controllable auxiliary power unit based electro-hydraulic variable speed drive system is probably a solution to enhance dynamic performance of variable speed drive on the basis of energy-saving. Except for the principal variable speed power source, there is an auxiliary power source—auxiliary power unit, which is actually a semi-active hydraulic accumulator unit. The auxiliary power unit can detect the relation between the supplied power by power source and the demanded power by actuator, and then release or absorb hydraulic power to improve actuator dynamic response. The dynamic performance of auxiliary power unit based variable speed drive system was investigated experimentally. Firstly, the set-up of proposed drive system was introduced. Dedicated to the complicated characteristics of multi-input-multi-output and strongly nonlinearity, the mathematical model was deduced, and a hierarchical control strategy was illustrated. The experimental results under two typical variable-load conditions were discussed. Furthermore, the comparisons were explained with the other three drive systems, which were valve-controlled motor drive, conventional variable speed drive, and pump-valve compound drive. Based on the experimental results, it is concluded that the auxiliary power unit based variable speed drive demonstrates an excellent dynamic performance, which can significantly improve the actuator response and control precision, as well as obtain a good energy-saving behavior.

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23

Handayani, Sri Utami. "KARAKTERISTIK POMPA SENTRIFUGAL ALIRAN CAMPUR DENGAN VARIABLE FREQUENCY DRIVE." ROTASI 15, no. 3 (December 19, 2013): 30. http://dx.doi.org/10.14710/rotasi.15.3.30-34.

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In an industry that uses large centrifugal pumps continuously, pump speed setting can reduce energy consumption significantly. By changing the speed of a centrifugal pump, capacity, head, and pump power required will change according to pump affinity laws. Speed of a centrifugal pump can be changed by variable frequency drive . This study aimed to investigate the characteristics of mixed flow centrifugal pumps with variable frequency drive. The results showed that 10% of maximum speed reduction can decrease power consumtion until 50%, while the increase in the efficiency is maximum 7.2%. The power reduction is different for different speed reduction. In a dynamic head dominated system the efficiency will remain constant during speed reduction while in static head dominated system will change.

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24

Chavan, Gayatri, and Sridhar S. "Speed Control of Dual Induction Motor Using Five Leg Inverter." E3S Web of Conferences 184 (2020): 01065. http://dx.doi.org/10.1051/e3sconf/202018401065.

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Over the past decade, research efforts have been made to decrease the number of power electronic devices needed in multi-motor drive systems in order to condense the overall complication and cost of the drive. This paper proposes speed control for a dual three-phase induction motor system driven by five-leg voltage source inverter (FL-VSI) which is used in industrial manufacturing processes. Industrial applications frequently need a number of variable speed electric drives. This technique uses five-leg inverter instead of using conventional two three phase inverters. In the majority of cases, these multi-motor drive systems need independent control of individual motors. It is shown recently that it is possible to separately control two three-phase induction machines supplied through a five-leg voltage source inverter, with one inverter leg being common to both machines. The entire performance of the speed control for the five leg voltage source inverter fed dual-motor drive system is investigated using MATLAB/SIMULINK software.

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25

Vodovozov, Valery, and Ilja Bakman. "Performance Improvement of Pumps Fed by the Variable Speed Drives." Electrical, Control and Communication Engineering 4, no. 1 (December 1, 2013): 45–51. http://dx.doi.org/10.2478/ecce-2013-0021.

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Abstract Speed inaccuracy decreases the pump efficiency, reliability, and energy saving. This research is devoted to the determination of the ways of accurate speed control of the pump drives operated under changeable loads. The impact of speed inaccuracy on the pump performance is studied. Based on the analysis of methods for the static accuracy improvement, the drawbacks of the traditional approaches have been shown with reference to the pumping applications. A new methodology of the slip compensation has been proposed for implementation to improve the scalar drive performance. It notably decreases the speed inaccuracy of the open-ended pumping applications. The enhanced quality of the drive control at different loading conditions has been shown on a laboratory test bench. Also, for the multi-pump systems this approach results in an additional benefit from the viewpoint of the operation around the best operation point providing a safe pump control both to exclude the pump damage and to improve the process quality.

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26

Joseph, Anto, Thanga Chelliah, Sze Lee, and Kyo-Beum Lee. "Reliability of Variable Speed Pumped-Storage Plant." Electronics 7, no. 10 (October 22, 2018): 265. http://dx.doi.org/10.3390/electronics7100265.

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The multi-channel (MC) back-to-back voltage source inverter (VSI)-fed doubly fed induction machine (DFIM) is emerging as a highly interesting topic in large-rated variable speed pumped-storage power plants (PSPP) in view of cost, optimal efficiency, and space requirements. Although the VSI is the fundamental part of the drive controlling the active/reactive power of the plant, redundancy is presently not adopted in practice causing the unit as a whole to shut down upon a failure in the converter and control circuit. This paper evaluates a large-rated (250 MW) DFIM-fed variable-speed unit of a PSPP in terms of its reliability and availability. A Markov model is developed to assess the reliability of the drive based on a number of factors including survivability and annual failure rate (FIT). Further, the Markov model is applied to different PSPPs for comparison of reliability among them.

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27

Johar, Leily Wustha, S. Umar Djufri, and Hendi Matalata. "Perancangan VFD Motor Induksi 1 Phase Untuk Pengaturan Awal Kecepatan Mobil Listrik." Journal of Electrical Power Control and Automation (JEPCA) 4, no. 2 (December 29, 2021): 47. http://dx.doi.org/10.33087/jepca.v4i2.51.

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Variable speed drives and the importance of controlling the speed of existing motors have attracted much attention with the advent of new electrical devices and magnetic materials. This paper is a comprehensive review of the application of VFD in energy saving electric motors. The aim is to identify energy saving opportunities and apply variable speed drives to existing electric motor applications. In this paper the authors hope to provide useful information for future variable speed drive applications such as fans, pumps, coolers, ventilators and as electric car propulsion. In this study, a series of frequency changes has been tested as an induction motor speed regulation (VFD), which in the results of this frequency change research can regulate the speed of the induction motor. In this study, the frequency change is still regulated analogously by changing the resistor size on the PWM signal generator IC for the MOSFET driver. For that the next research is expected to change the frequency can be done digitally

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28

Spahiu, Dr Sc Aida, Dr Sc Orion Zavalani, and MSc Altin Uka. "Using Variable Speed Control on Pump Application." ILIRIA International Review 2, no. 1 (June 30, 2012): 251. http://dx.doi.org/10.21113/iir.v2i1.174.

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Pumps are one of the most common variable speed drive (VSD) system applications and special interest has focused on improving their energy efficiency by using variable speed control instead of throttling or other less efficient flow control methods. Pumps are the single largest user of electricity in industry in the European Union, consuming 160 TWh per annum of electricity and accounting for 79 million tonnes of carbon dioxide (CO2) emissions [1]. Centrifugal pumps are the most likely pump style to provide a favorable return based on energy savings when applied with a variable speed drive. To help illustrate this, are conducted benchmark testing to document various head and flow scenarios and their corresponding effect on energy savings. Paper shows the relationship of static and friction head in the energy efficiency equation and the effect of motor, pump and VSD efficiencies. The received results are good reference points for engineers and managers of water sector in Albania to select the best prospects for maximizing efficiency and energy savings.

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29

Rajendran, Saravanakumar, and Debashisha Jena. "Load Mitigation and Optimal Power Capture for Variable Speed Wind Turbine in Region 2." Journal of Renewable Energy 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/978216.

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This paper proposes the two nonlinear controllers for variable speed wind turbine (VSWT) operating at below rated wind speed. The objective of the controller is to maximize the energy capture from the wind with reduced oscillation on the drive train. The conventional controllers such as aerodynamic torque feedforward (ATF) and indirect speed control (ISC) are adapted initially, which introduce more power loss, and the dynamic aspects of WT are not considered. In order to overcome the above drawbacks, modified nonlinear static state with feedback estimator (MNSSFE) and terminal sliding mode controller (TSMC) based on Modified Newton Raphson (MNR) wind speed estimator are proposed. The proposed controllers are simulated with nonlinear FAST (fatigue, aerodynamics, structures, and turbulence) WT dynamic simulation for different mean wind speeds at below rated wind speed. The frequency analysis of the drive train torque is done by taking the power spectral density (PSD) of low speed shaft torque. From the result, it is found that a trade-off is to be maintained between the transient load on the drive train and maximum power capture.

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30

Duranay, Zeynep Bala, Hanifi Guldemir, and Servet Tuncer. "Implementation of a V/f Controlled Variable Speed Induction Motor Drive." EMITTER International Journal of Engineering Technology 8, no. 1 (June 2, 2020): 35–48. http://dx.doi.org/10.24003/emitter.v8i1.490.

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DSP implementation of speed control of three phase induction motor drive is presented in this paper. A closed loop speed control has been achieved using constant V/f technique which is a simple scalar control method used to control the magnitude of the control quantities. In this study, a fourth order polynomial drived from V/f curve is constructed instead of using look up table which takes much time for determination of voltage from frequency value. A PI controller is used in speed control. dSPACE DS-1103 controller board is used for the implementation with Matlab/Simulink, which has a simple real time interface. Steady-state speed characteristics and transient responses with various reference speed commands are presented by experimental system. The simulation and experimental results provide a smooth speed response and good performance under various dynamic operations. Real time speed control has been implemented and some results are presented.

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31

Song, Xiao Na. "Research on Multi-Speed Control of Variable-Frequency Drive." Applied Mechanics and Materials 538 (April 2014): 425–28. http://dx.doi.org/10.4028/www.scientific.net/amm.538.425.

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This paper introduces a noval experimental teaching project. Different from previous experiment, in this project, three-phase motor can operate at multi-speed mode or continuously variable speed mode controlled by PLC and VFD. The obvious characteristic of the experiment is that the VFD is controlled by PLC automatically. The configuration of the experiment including hardware and software is introduced in detail. The results of the execuation of the PLC program reveals that three-phase motor can operate in two modes according to the instructions from PLC. In addition, the speed can be changed with the corresponding parameters seting. Therefore, the knowledge of PLC and VFD are combined in one teaching project, through which student can master more practical technique. The work of this paper is significant for improving the students’ comprehensive capability.

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32

Udovichenko, Aleksey V., Dmitri Kaluzhskij, Nikita Uvarov, and Ali Mekhtiyev. "Electric Motors for Variable-Speed Drive of Lock Valves." Electronics 10, no. 21 (November 8, 2021): 2727. http://dx.doi.org/10.3390/electronics10212727.

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Improving the operational reliability of nuclear power plants, combined heat and power plants (CHP), as well as oil and gas pipelines is a priority task in the development of a variable-speed drive for lock valves used at these facilities. This paper analyzes the technical requirements for such devices: the motor has been selected, its electrical equilibrium and moment equations have been obtained; recommendations for the selection of the kinematic drive scheme have been formulated. Based on the theoretical data obtained, a prototype has been developed, manufactured, and tested.

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Tresna Umar Syamsuri, Harrij Mukti K., and Rohmanita Duanaputri. "Analisis Penggunaan Variable Speed Drive (VSD) pada Motor Kompresor." ELPOSYS: Jurnal Sistem Kelistrikan 8, no. 3 (December 12, 2021): 72–75. http://dx.doi.org/10.33795/elposys.v8i3.82.

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Variable Speed Drive (VSD) adalah perangkat yang mengatur kecepatan dan gaya rotasi, atau torsi keluaran peralatan mekanis. VSD meningkatkan efisiensi dengan memungkinkan motor dioperasikan pada kecepatan ideal untuk setiap kondisi beban. Dalam banyak aplikasi, VSD mengurangi konsumsi listrik motor sebesar 30-60%. Potensi penghematan energi motor listrik sangat besar karena sistem motor menggunakan lebih dari 60% daya listrik yang dikonsumsi oleh industri. Dari kelebihan inilah VSD dapat digunakan untuk mengontrol kecepatan motor kompresor sehingga dapat meninggkatkan kinerja dari motor kompresor. Motor Kompesor merupakan sebuah alat yang mengkompresi udara dan menaikkan tekanannya Untuk mengkompresi udara kompresor membutuhkan tenaga penggerak, dan salah satunya adalah motor. Ketika tekanan udara output pada kompresor melebihi nilai tertentu, relief valve akan terbuka secara otomatis. Sehingga udara di dalam tangki tetap meskipun motor masih berputar. Dalam pengoperasian kompresor, motor selalu dihidupkan dengan arus start yang tinggi sehingga daya yang dibutuhkan juga akan tinggi, sehingga dibutuhkan kontrol pada motor kompresor.

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Ryzvanovich, A. Ya, and V. A. Generalov. "Variable-Speed Drive Permitting Expanded Use of Pulsed Motion." Russian Engineering Research 41, no. 9 (September 2021): 788–91. http://dx.doi.org/10.3103/s1068798x21090239.

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Phanthuna, Nattapong, and Somkieat Thongkeaw. "Implementation of Variable Speed Drive for Oil-Pump System." Applied Mechanics and Materials 879 (March 2018): 188–95. http://dx.doi.org/10.4028/www.scientific.net/amm.879.188.

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This paper presents a study of efficiency improvement in the oil pipeline system. Instead of using only control valve, the original system of two oil pumps which have rating of 1,850 kW each is redesigned by using variable speed drive (VSD) technology together with the control valve. This proposed installation method of VSD will be performed to adjust and open the control valve fully at 100%. Furthermore, the frequency control method of the VSD also depends on types of oil. In the efficiency analysis of the oil pipeline system, four types of oil that is JET A1, Disel, B91, and B95 having different density coefficient will be used respectively. The new and the original data acquisition of relationships between transported oil quantity of each type per period and consumed power are compared. From the sequent results, it can be confirmed that this proposed method used to the practical analysis in accordance with Affinity Law can be applied to not only improve the efficiency and also save cost of the power consumption up to 42.96%.

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Shulha, Yurii Ivanovych, Oleksandr Valeriiovych Danilin, Aleksandr Nikolaevich Smilenko, and Andriy Volodumurovich Sukailo. "STUDY OF MODES LIFT INSTALLATIONS WITH VARIABLE SPEED DRIVE." Herald of the National Technical University of Ukraine «Kyiv Polytechnic Institute». Series of «Mining», no. 33 (May 11, 2017): 47–51. http://dx.doi.org/10.20535/2079-5688.2017.33.100697.

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M, Rama Subbamma, Madhusudhan V, Anjaneyulu K.S.R, and Sujatha P. "A Variable Speed PFC Converter for Brushless SRM Drive." International Journal on Cybernetics & Informatics 5, no. 1 (February 28, 2016): 31–44. http://dx.doi.org/10.5121/ijci.2016.5104.

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de Almeida, Pedro Machado, Rodolfo Lacerda Valle, Pedro Gomes Barbosa, Vinicius Foletto Montagner, Vladimir Cuk, and Paulo Fernando Ribeiro. "Robust Control of a Variable-Speed BLDC Motor Drive." IEEE Journal of Emerging and Selected Topics in Industrial Electronics 2, no. 1 (January 2021): 32–41. http://dx.doi.org/10.1109/jestie.2020.3035055.

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Pandele, Patrick, Edouard Thibaut, and Eric Meyer. "All-Electrical FPSO Scheme With Variable-Speed Drive Systems." IEEE Transactions on Industry Applications 49, no. 3 (May 2013): 1188–97. http://dx.doi.org/10.1109/tia.2013.2252133.

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Lindahl, Peter A., Muhammad Tauha Ali, Peter Armstrong, Andre Aboulian, John Donnal, Les Norford, and Steven B. Leeb. "Nonintrusive Load Monitoring of Variable Speed Drive Cooling Systems." IEEE Access 8 (2020): 211451–63. http://dx.doi.org/10.1109/access.2020.3039408.

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Kuo-Kai Shyu, Faa-Jeng Lin, Hsin-Jeng Lin, and Bor-Sen Juang. "Robust variable structure speed control for induction motor drive." IEEE Transactions on Aerospace and Electronic Systems 35, no. 1 (1999): 215–24. http://dx.doi.org/10.1109/7.745693.

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SINGH, BHIM, S. P. SRIVASTAVA, and S. K. BARAL. "LOAD COMMUTATED INVERTER FED VARIABLE SPEED RELUCTANCE MOTOR DRIVE." Electric Machines & Power Systems 18, no. 3 (May 1990): 277–82. http://dx.doi.org/10.1080/07313569008909472.

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Henze, Michael. "The Integral Motor — A new variable-speed motor drive." World Pumps 1996, no. 358 (July 1996): 54–57. http://dx.doi.org/10.1016/s0262-1762(99)80683-x.

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Shea, J. J. "Variable speed drive fundamentals, 3 rd ed. [Book Reviews]." IEEE Electrical Insulation Magazine 16, no. 6 (November 2000): 44. http://dx.doi.org/10.1109/mei.2000.887608.

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Khramshina, Ekaterina A., Alexander S. Karandaev, and Rifkhat R. Khramshin. "Improving Energy Efficiency of the Variable Frequency Drive of the Forced-Draught Fan with the Two-Speed Asynchronous Motor." Applied Mechanics and Materials 792 (September 2015): 128–33. http://dx.doi.org/10.4028/www.scientific.net/amm.792.128.

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Based on the example of forced-draught fans of the GOFHWB-100 series hot water boilers (gas and oil fired hot water boilers) power supply reserves of the electric drive with two-speed asynchronous motor have been determined. The structural chart of the developed control system of the electric drive with winding changeover depending on the boiler performance is provided. The paper considers power consumption of electric drive in the variable frequency speed control mode at the motor operation on the high and low speed windings. It presents methods for calculation of energy performance based on computing the equivalent efficiency of the fluid-handling application. The analysis of the efficiency change has proved that the variable frequency control enables electric power savings at the low speed winding by 5 to 6%. The results obtained are recommended to be widely applied at the change-over of the electric drives with two-speed asynchronous motors to the variable frequency control of performance.

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Sharkov, Oleg, Sergey Koryagin, and Nikolay Velikanov. "Research of working capacity of pulsed variable-speed drives." MATEC Web of Conferences 287 (2019): 07002. http://dx.doi.org/10.1051/matecconf/201928707002.

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The paper presents the results of experimental researches of the basic working capacity characteristics of pulsed variable-speed drives - gear ratio, efficiency factor, and reliability of the eccentric free-wheel mechanisms When conducting research, the main working capacity parameters of the pulsed variable-speed drive (independent factors) changed according to the design of experiment in the range: the load applied to the output shaft was from 250 to 2.750 N·m; adjustable gear ratio - from 20 to 180. It was established that the reliability of the eccentric free-wheel mechanisms is guaranteed when making mechanisms of 100Cr6 steel with hardness not lower than HRCЭ 58…62 with a module of at least 0.75 mm. It was shown that the yield surface, which characterizes the change in the gear ratio of the pulsed variable-speed drive, can be described by a model using first-order polynomials. It was established that with increasing load, a slight increase (at 1.0...9.9%) occurs in the adjusted gear ratio, which has a character close to linear. It was concluded that with an increase in load, the increase in efficiency factor is non-linear and equals 1.8...2.6 times, an increase in the gear ratio causes its linear decrease by 1.13...1.64 times in the dependence close to a linear one. Empirical dependences are obtained to determine the magnitude of the gear ratio and efficiency factor.

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Mohd Nasib, Affandi, Henry Nasution, Azhar Abdul Aziz, Muchamad Oktaviandri, Sumeru, and Sulaimon Shodiya. "Energy Analysis of Split Air Conditioning System Using Variable Speed Drive." Applied Mechanics and Materials 819 (January 2016): 212–15. http://dx.doi.org/10.4028/www.scientific.net/amm.819.212.

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An air conditioning (AC) system design requires two main aspects that should be taken into consideration, there are reducing energy consumption and ensuring thermal comfort. This paper present variable speed drive on compressor motor is being tested to reduce the energy consumption. Conventional AC system to use on/off controller where the compressor motor turns itself on and runs at maximum speed then turns back off to achieve the temperature setting. This controller consumes more energy, however, by using a variable speed drive, the compressor motor will constantly run at various speeds while achieving the temperature setting. A system that developed software to implement the controller algorithms was installed in a thermal environmental room with data acquisition to monitor the room temperature, energy consumption, energy saving and coefficient of performance. Measurements were taken during the one hour experimental period at a time interval of three minutes for temperature set-points of 22, 23 and 24°C with internal heat loads of 500, 700 and 1000 W. The proposed technique can save energy and thermal comfort in comparison with conventional on/off control. The experiment results indicate that the application of variable speed drive on compressor motor is better than conventional on/off.

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Lovrec, Darko, and Vito Tič. "Speed-controlled hydraulic drive systems for heavy machinery." IMK-14 - Istrazivanje i razvoj 27, no. 2 (2021): 61–72. http://dx.doi.org/10.5937/imk2102061l.

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The paper discusses electrohydraulic variable supply systems in different design concepts. In the forefront of discussion are design concepts with constant and speed-controlled electric motor in combination with constant and variable pumps, implemented within different control strategies.

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Rahimi, Mohsen. "Drive train dynamics assessment and speed controller design in variable speed wind turbines." Renewable Energy 89 (April 2016): 716–29. http://dx.doi.org/10.1016/j.renene.2015.12.040.

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Rinkeviciene, Roma, and Andrius Petrovas. "Model of Vector Controlled Induction Drive." Solid State Phenomena 147-149 (January 2009): 149–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.149.

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The paper presents the model of vector controlled induction motor. Induction motor model is carried out in reference frame, fixed on stator. Elaborated model of the drive is suitable for investigation dynamics because output signals appear as real currents, flux linkages and other variables. Vector control law model is implemented for variables in synchronous reference frame; therefore controller operates with transformed variables. Structure of designed model reflects the real variable speed drive. Model of vector controlled induction drive comprise model of induction motor, feedback signals and blocks as well as speed and flux reference blocks and controllers for producing motor supply signals. Feedback blocks are used for calculation stator current vector in the rotor flux linkage reference frame. For flux and speed control are designed lag controllers. Between advantages of that model is additional simulation of current channel law.

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