Journal articles: 'Variable speed drives'

1

BARTON, T. H. "VARIABLE FREQUENCY VARIABLE SPEED AC DRIVES." Electric Machines & Power Systems 12, no. 3 (1987): 143–63. http://dx.doi.org/10.1080/07313568708960100.

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2

Drury, W., and D. Grant. "Variable-speed drives - the future." Power Engineering Journal 8, no. 1 (1994): 27–34. http://dx.doi.org/10.1049/pe:19940103.

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Strangas, E. G., V. E. Wagner, and T. D. Unruh. "Variable speed drives evaluation test." IEEE Industry Applications Magazine 4, no. 1 (1998): 53–57. http://dx.doi.org/10.1109/2943.644887.

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4

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 (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&ndash;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&divide;14) mm to the theoretical premise.

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Davis, R. M. "Power Electronics and Variable Speed Drives." Power Engineering Journal 3, no. 6 (1989): 310. http://dx.doi.org/10.1049/pe:19890052.

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Stokes, R. W. "Power Electronics and Variable Speed Drives." Power Engineering Journal 5, no. 5 (1991): 248. http://dx.doi.org/10.1049/pe:19910048.

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7

Medford, D. C. "Power Electronics and Variable Speed Drives." IEE Review 35, no. 1 (1989): 36. http://dx.doi.org/10.1049/ir:19890014.

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8

Bodson, J. M. "Digital Control Improves Variable Speed Drives." EPE Journal 2, no. 4 (1992): 243–48. http://dx.doi.org/10.1080/09398368.1992.11463303.

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Tolvanen, Jukka. "Saving energy with variable speed drives." World Pumps 2008, no. 501 (2008): 32–33. http://dx.doi.org/10.1016/s0262-1762(08)70164-0.

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10

Bassarear, J. H., and P. F. Thomas. "Variable speed drives for semiautogenous mills." Mining, Metallurgy & Exploration 3, no. 2 (1986): 136–44. http://dx.doi.org/10.1007/bf03402650.

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11

Darley, Dana. "Conveying Savings via Variable Speed Drives." Plastics Engineering 70, no. 2 (2014): 40–41. http://dx.doi.org/10.1002/j.1941-9635.2014.tb01124.x.

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12

Zagar, Philipp, Helmut Kogler, Rudolf Scheidl, and Bernd Winkler. "Hydraulic Switching Control Supplementing Speed Variable Hydraulic Drives." Actuators 9, no. 4 (2020): 129. http://dx.doi.org/10.3390/act9040129.

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Primary control of linear motion by variable speed electric motors driving a hydraulic cylinder via a constant displacement pump is an established and successful concept with a frequent use in industry. One problem arises when low or zero motion speed has to be realized under high pump pressure conditions. Such load scenarios occur frequently in certain pressing processes, e.g., for sintering or veneering. Most pumps have a lower speed limit, below which critical tribological conditions occur which impair lifespan and efficiency. In addition, pump speed control and pump fluctuation suffer from the mixed lubrication conditions in such an operation range. For a circumvention of such low speed pump operation, a digital valve control concept is presented and studied in this paper. Valve control is used in load holding phases with low speed. Pressure is provided by an accumulator which is charged by the pump in short charging cycles at reasonable pump speeds. It is shown that the mean control error during load holding phase lies within the desired band and the fluctuations of the control force are lower than those of the pump control. In addition, the unfavorable pump operation conditions can be avoided via digital control.

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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 (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

Hudgins, Jerry, and Rik De Doncker. "Power Semiconductor Devices: For Variable Speed Drives." IEEE Industry Applications Magazine 18, no. 4 (2012): 18–25. http://dx.doi.org/10.1109/mias.2012.2191341.

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15

Ritchie, Neil, and Martin Briant. "Variable speed drives cuts 20% energy costs." World Pumps 2014, no. 10 (2014): 18–19. http://dx.doi.org/10.1016/s0262-1762(14)70237-8.

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16

Gibson, Ian H. "Variable-speed drives as flow control elements." ISA Transactions 33, no. 2 (1994): 165–69. http://dx.doi.org/10.1016/0019-0578(94)90049-3.

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17

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 (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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18

Guerrero, Jose Manuel, Gustavo Navarro, Kumar Mahtani, and Carlos Platero. "Ground Fault Detection Method for Variable Speed Drives." IEEE Transactions on Industry Applications 57, no. 3 (2021): 2547–58. http://dx.doi.org/10.1109/tia.2021.3064001.

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19

Yacamini, R., P. Brogan, W. Phang, and A. Scott. "Variable speed drives for remote downhole pump applications." Power Engineering Journal 14, no. 1 (2000): 29–36. http://dx.doi.org/10.1049/pe:20000105.

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20

Sbarbaro, Daniel. "CONTROL OF CRUSHING CIRCUITS WITH VARIABLE SPEED DRIVES." IFAC Proceedings Volumes 38, no. 1 (2005): 80–84. http://dx.doi.org/10.3182/20050703-6-cz-1902.01692.

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21

Stronach, A. F., and P. Vas. "Variable-speed drives incorporating interacting multiloop adaptive controllers." IEE Proceedings - Control Theory and Applications 142, no. 5 (1995): 411–19. http://dx.doi.org/10.1049/ip-cta:19951981.

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22

Hall, J. K. "Book review: Power Electronics and Variable-Speed Drives." IEE Proceedings B Electric Power Applications 132, no. 2 (1985): 115. http://dx.doi.org/10.1049/ip-b.1985.0016.

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23

Bartolucci, E. J., and B. H. Finke. "Cable design for PWM variable-speed AC drives." IEEE Transactions on Industry Applications 37, no. 2 (2001): 415–22. http://dx.doi.org/10.1109/28.913704.

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24

Lönnberg, Mikko. "Variable Speed Drives for energy savings in hospitals." World Pumps 2007, no. 494 (2007): 20–24. http://dx.doi.org/10.1016/s0262-1762(07)70395-4.

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25

NANDAM, PRADEEP K., and P. C. SEN. "Control laws for sliding mode speed control of variable speed drives." International Journal of Control 56, no. 5 (1992): 1167–86. http://dx.doi.org/10.1080/00207179208934362.

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26

Schmidt, Lasse, and Kenneth Vorbøl Hansen. "Electro-Hydraulic Variable-Speed Drive Networks—Idea, Perspectives, and Energy Saving Potentials." Energies 15, no. 3 (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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27

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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28

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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29

Vodovozov, Valery, and Ilja Bakman. "Performance Improvement of Pumps Fed by the Variable Speed Drives." Electrical, Control and Communication Engineering 4, no. 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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30

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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31

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 (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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32

Ram, Ganapathy, and Santha K R. "Review of Sliding Mode Observers for Sensorless Control of Permanent Magnet Synchronous Motor Drives." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 1 (2018): 46. http://dx.doi.org/10.11591/ijpeds.v9.i1.pp46-54.

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Permanent magnet synchronous motors (PMSMs) are increasingly used in high performance variable speed drives of many industrial applications. PMSM has many features, like high efficiency, compactness, high torque to inertia ratio, rapid dynamic response, simple modeling and control, and maintenance free operation. Presence of position sensors presents several disadvantages, such as reduced reliability, susceptibility to noise, additional cost and weight and increased complexity of the drive system. For these reasons, the development of alternative indirect methods for speed and position control becomes an important research topic. Advantages of sensorless control are reduced hardware complexity, low cost, reduced size, cable elimination, increased noise immunity, increased reliability and decreased maintenance. The key problem in sensorless vector control of ac drives is the accurate dynamic estimation of the stator flux vector over a wide speed range using only terminal variables (currents and voltages). The difficulty comprises state estimation at very low speeds where the fundamental excitation is low and the observer performance tends to be poor. Moreover, the noises of system and measurements are considered other main problems. This paper presents a comprehensive study of the different sliding mode observer methods of speed and position estimations for sensorless control of PMSM drives.

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33

Pylaev, B. V. "Shaping of Cams for High-Torque Variable-Speed Drives." Russian Engineering Research 39, no. 8 (2019): 645–49. http://dx.doi.org/10.3103/s1068798x19080161.

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34

Othman, Saba A., Jamal A. K. Mohammed, and Farag Mahel Mohammed. "Variable Speed Drives in Electric Elevator Systems: A Review." Journal of Physics: Conference Series 1973, no. 1 (2021): 012028. http://dx.doi.org/10.1088/1742-6596/1973/1/012028.

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35

Ghoneam, Sobhy, M., Samir, M. Abdel-Rahman, and Dalia, M. El–Gazzar,. "VIBRATION ANALYSIS OF CENTRIFUGAL PUMP WITH VARIABLE SPEED DRIVES." JES. Journal of Engineering Sciences 39, no. 3 (2011): 565–79. http://dx.doi.org/10.21608/jesaun.2011.127663.

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36

Drury, W. "Electrical variable-speed drives: mature consumable or radical infant?" Power Engineering Journal 13, no. 2 (1999): 65–78. http://dx.doi.org/10.1049/pe:19990205.

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37

Hwi-Beon Shin. "New antiwindup PI controller for variable-speed motor drives." IEEE Transactions on Industrial Electronics 45, no. 3 (1998): 445–50. http://dx.doi.org/10.1109/41.679002.

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38

McCulloch, M. D., C. F. Landy, W. Levy, and I. MacLeod. "CASED: A simulation package designed for variable speed drives." SIMULATION 57, no. 4 (1991): 216–26. http://dx.doi.org/10.1177/003754979105700404.

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39

Bowes, S. R., and T. Davies. "Microprocessor-based development system for PWM variable-speed drives." IEE Proceedings B Electric Power Applications 132, no. 1 (1985): 18. http://dx.doi.org/10.1049/ip-b.1985.0002.

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40

Lockwood, M. "Simulation of unstable oscillations in PWM variable-speed drives." IEEE Transactions on Industry Applications 24, no. 1 (1988): 137–41. http://dx.doi.org/10.1109/28.87264.

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41

Sequeira, Melwyn, and Sanath Alahakoon. "Energy efficient variable speed drives empowered with torque estimation." Energy Procedia 160 (February 2019): 194–201. http://dx.doi.org/10.1016/j.egypro.2019.02.136.

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Campos-Delgado, D. U., D. R. Espinoza-Trejo, and E. Palacios. "Fault-tolerant control in variable speed drives: a survey." IET Electric Power Applications 2, no. 2 (2008): 121–34. http://dx.doi.org/10.1049/iet-epa:20070203.

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Militão, Lucas A., Caio D. Fernandes, Diego dos Santos, et al. "A novel cooling geometry for subsea variable speed drives." Applied Thermal Engineering 185 (February 2021): 116483. http://dx.doi.org/10.1016/j.applthermaleng.2020.116483.

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Sadek, Mohamed, Rehab El-Maghraby, and Mohamed Fathy. "Evaluation of variable speed drives to improve energy efficiency and reduce gas emissions: Case study." Chemical Industry and Chemical Engineering Quarterly, no. 00 (2022): 18. http://dx.doi.org/10.2298/ciceq220318018s.

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Variable speed drives are the most promising technique to reduce electric motors energy consumption. This paper discusses energy savings achieved by installing variable speed drives to control rotating equipment motors such as pumps, compressors, blowers, and fans in oil processing facilities. In addition to energy savings, variable speed drives will improve overall equipment efficiency, increase reliability, and reduce greenhouse gases (GHG) emissions. An Energy audit was performed on a case study to investigate energy consumption for all electric motors. Technical and operational constraints for installing and operating variable speed drives have been discussed. Installation requires adjustments in operation schedules and parameters to allow reducing energy consumption. The case study has illustrated how to calculate energy savings for Pipelines, air coolers, air blowers for furnaces, pumps with variable flow rates and reciprocating compressing systems. Variable speed drives were technically and economically accepted in air blowers, fans, and pumps. Energy consumption and greenhouse gases have been reduced by 67%, Payback period for the whole project was less than 1 year. Meanwhile, it was not valid for reciprocating compressors as the Payback period was 6.2 years.

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45

Glazyrin, Alexander S., Sergey N. Kladiev, Vadim V. Timoshkin, et al. "SETUP AND INVESTIGATION OF THE OPERATION MODES OF THE SPEED OBSERVER IN A CONTROLLED DC ELECTRIC DRIVE." ELECTRICAL AND DATA PROCESSING FACILITIES AND SYSTEMS 19, no. 2 (2023): 30–42. http://dx.doi.org/10.17122/1999-5458-2023-19-2-30-42.

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In modern closed-loop controlled electric drives used in manufacturing, the use of speed, current, torque, and other technological variable sensors is required. In some cases, indirect estimation of the electric drive state vector is required, when the use of technological parameter sensors (primarily speed sensors) is difficult or impossible. One of the problems is the length of the information cable in the feedback channel from the actuator to the power converter, which makes it difficult to use direct measurement methods. There are also difficulties in using sensors in an aggressive environment. For example, in the coal mining industry, electric motors or the entire electric drive are often located in an explosion-proof enclosure, and installing additional sensors will require expensive modernization of the entire system. State observers in sensorless electric drives allow restoring unmeasurable state vector components based on measured electrical signals in the power converters of the electric drive. From the perspective of a closed-loop controlled electric drive system, the main feedback is the feedback on the angular rotation frequency. Electric drives based on separately excited DC motors (SEDC) are simpler to investigate and implement such systems. The linearized mathematical model of an SEDC contains a relatively smaller number of differential equations compared to variable frequency drives due to the presence of independent channels for forming magnetic flux in the air gap and electromagnetic torque, which simplifies the analysis and synthesis of sensorless control systems using speed observers. Researching the observer of angular rotation for DC electric drives allows for developing design skills on a simpler system before moving on to variable frequency drives. Research in this area for both DC and AC electric drives is promising because it allows for an increased range of regulation and accuracy of the output coordinate in sensorless electric drives at the required level. This article is dedicated to the study of the properties of speed observers for DC electric drives with independent excitation of various structures. Aim of research Analysis of rotation frequency observer structure in DC motor drives with error reduction based on the proportional principle. Research methods Theoretical and experimental research methods were used in this study. Theoretical methods included the theory of automatic control, state observer theory, theory of electric drives, theory of electric machines, mathematical modeling, systems of differential equations, Laplace transforms, and numerical methods for solving differential equations. Experimental studies were conducted on a software-hardware complex, where the genetic algorithm method was used to identify the parameters of the electric machine equivalent circuit. Results Analytical expression for the characteristic equation roots for the investigated structure of the DC motor drive's speed observer was obtained. Based on this expression, stability criteria and trends in changes of the quality indicators for the angular velocity estimation were determined with varying observer coefficients.

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46

Kodkin, Vladimir L., and Aleksandr S. Anikin. "Experimental study of the VFD’s speed stabilization efficiency under torque disturbances." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 1 (2021): 80. http://dx.doi.org/10.11591/ijpeds.v12.i1.pp80-87.

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The article presents a technique for experimental research of variable frequency drives experiencing periodic torque disturbances of variable frequency. The technique is based on the nonlinear transfer function of a link of an asynchronous electric motor, which forms an electromagnetic torque, proposed in previously published articles. The dependence of the transfer function on the frequency of the stator voltage and slip determines the research methodology. Experiments have shown the advantage of the dynamic characteristics of a drive with a positive feedback on the stator current over electric drives with traditional control methods (vector and scalar sensorless), and in terms of dynamic characteristics they also exceed drives with a vector control closed in motor speed. These advantages are retained when the frequency of change of the disturbing torque is changed from 0 to 5 Hz.

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Gallo, D., C. Landi, and N. Pasquino. "Experimental Evaluation of Conducted Emissions by Variable-Speed Drives Under Variable Operating Conditions." IEEE Transactions on Instrumentation and Measurement 57, no. 7 (2008): 1350–56. http://dx.doi.org/10.1109/tim.2008.917176.

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48

Jia, Guanlong, Mingshuo Li, Binhao Shi, Xinchao Yu, and Xiaoming Liu. "A variable frequency injection method for modular multilevel converters in variable speed drives." Energy Reports 9 (September 2023): 939–47. http://dx.doi.org/10.1016/j.egyr.2023.04.198.

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49

Mardiyanto, Ignatius Riyadi. "The Harmonics Effect of Variable Speed Drives on Generator Performance." Current Journal: International Journal Applied Technology Research 1, no. 2 (2020): 112–19. http://dx.doi.org/10.35313/ijatr.v1i2.34.

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Large motors often burden synchronous generators as power plants in factories. This motor is commonly using to regulate rotation using Variable Speed Drive (VSD). From the load side, VSD, as a regulator of motor rotation, can reduce power loss. On the generator side as a power plant, this load with VSD affects the waveform of the generator. The experiments on a small capacity generator (6 kVA) with a VSD as regulating the motor rotation with a load of about 1.1 kW shows effectiveness power transfer is about 40.7% with VSD, and without VSD, efficiency is approximately 39.6%. The motor losses by installing VSD interpreted as transferring losses to the generator with savings is about 1 %. The experiments also showed that generator performance decreases when loaded with VSD at around 6%, and a generator temperature increases at 20 0C higher than without VSD.

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50

Dey, D. A. "Guidelines in selecting variable-speed drives from a user's viewpoint." IEEE Transactions on Industry Applications 24, no. 6 (1988): 1101–6. http://dx.doi.org/10.1109/28.17485.

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Journal articles on the topic 'Variable speed drives'

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