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Relevant bibliographies by topics / Flywheel speed

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Academic literature on the topic 'Flywheel speed'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Flywheel speed"

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Dhand, Aditya, and Keith Pullen. "Analysis of continuously variable transmission for flywheel energy storage systems in vehicular application." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 2 (May 8, 2014): 273–90. http://dx.doi.org/10.1177/0954406214533096.

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Energy storage devices are an essential part of hybrid and electric vehicles. The most commonly used ones are batteries, ultra capacitors and high speed flywheels. Among these, the flywheel is the only device that keeps the energy stored in the same form as the moving vehicle, i.e. mechanical energy. In order to connect the flywheel with the vehicle drive line, a suitable means is needed which would allow the flywheel to vary its speed continuously, in other words a continuously variable transmission (CVT) is needed. To improve the efficiency and speed ratio range of the variators, a power spilt CVT (PSCVT) can be employed. This paper discusses the kinematics of PSCVT used to connect the flywheel to the driveline. A methodology describing the characteristic equations of speed ratio, power flow and efficiency of the PSCVT for various types including power recirculating and multi regime in both directions of power flow has been presented. An example of a PSCVT for a flywheel energy storage system (FESS) is computed using the derived equations and the results compared.

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Shinde, Ankita, Kratika Singh Rawat, Ruchi Mahajan, Veeraj Pardeshi, Balbheem Kamanna, and Sachin Sheravi. "Design and Analysis of Flywheel for Different Geometries and Materials." Global Journal of Enterprise Information System 9, no. 1 (May 5, 2017): 95. http://dx.doi.org/10.18311/gjeis/2017/15872.

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Flywheel is a mechanical device used to store energy and utilize it whenever it required. Flywheels find its application in number of fields ranging from IC engine of 2-wheeler to more powerful jet engines. Increase in Kinetic Energy of flywheel is the most critical factor for the design engineers. The literature survey shows that flywheel can be redesign for mass optimization which results light weight and Increase in storage capacity. In this project work, an attempt is made to redesign the existing flywheel in terms of its geometry and different materials. Different cross sections of the flywheel are designed using 3D designing software Solidworks 2015. Finite Element analysis is used to calculate the Maximum Rotational speed the flywheel and the amount of Kinetic energy stored at that speed. The results shows that flywheel with Triangular cross sectional geometry and made of S-glass epoxy composite material stores highest Kinetic Energy per unit mass compare to all other combination of Geometries and materials. This New design of flywheel saves weight by 65.252kg compared to existing designs.

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Dragoni, Eugenio. "Mechanical design of flywheels for energy storage: A review with state-of-the-art developments." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 5 (September 1, 2017): 995–1004. http://dx.doi.org/10.1177/1464420717729415.

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For years, engineers and designers have capitalized on electrochemical batteries for long-term energy storage, which can only last for a finite number of charge–discharge cycles. More recently, compressed hydrogen is being scrutinized as a large-scale storage medium but this poses the risk of spreading high-pressure vessels with inflammable content. Historically, flywheels have provided an effective way to smooth out speed fluctuations in irregular machines and mechanisms. With advancements in composite materials, magnetic bearings, and mechatronic drives, flywheels have become the subject of extensive research as power storage devices for mobile or fixed installations. Flywheel energy storage systems are considered to be an attractive alternative to electrochemical batteries due to higher stored energy density, higher life term, deterministic state of charge and ecological operation. The mechanical performance of a flywheel can be attributed to three factors: material strength, geometry, and rotational speed. Focusing on the simple relationship between these variables, this paper reviews the literature of flywheel technology and explores the merits of four simple but unconventional flywheel configurations that have not been examined so far. Two geometries assume the use of monolithic isotropic materials two solutions are based on the use of high-strength strips or tapes wound up to form a multilayered structure.

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MIYATA, Kenji, and Iwao HARADA. "Super high speed flywheel." Transactions of the Japan Society of Mechanical Engineers Series C 52, no. 474 (1986): 584–89. http://dx.doi.org/10.1299/kikaic.52.584.

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Zhang, Xiu Hua, Xue Feng Zhao, and Xing Lei Zhang. "Analysis of High-Speed Energy-Storing Flywheel Rotor." Applied Mechanics and Materials 214 (November 2012): 249–53. http://dx.doi.org/10.4028/www.scientific.net/amm.214.249.

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Appropriate rotor material and reasonable structure should be used for increase energy-storing density of flywheel. Theoretical analysis and design to high-speed energy-storing flywheel rotor with maximum energy-storing density is studied in the paper．The ratio of inner diameter and outer diameter and structure dimensions of a given condition flywheel rim is obtained by calculating. And the interference fit of rim/hub of the flywheel is analyzed with finite element software. One efficient and reliable calculating foundation and analysis method for the structure design of the flywheel rotor is provided.

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Kushwaha, Prabhakar, Sanjoy K. Ghoshal, and Kabir Dasgupta. "Dynamic analysis of a hydraulic motor drive with variable inertia flywheel." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 6 (September 25, 2019): 734–47. http://dx.doi.org/10.1177/0959651819875914.

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A flywheel is presented in this article, which can adaptively generate variable inertia in response to the application requirements in a hydraulic drive. The said flywheel consists of four sliders in the guide track of a host flywheel frame which change its position as the rotational speed of the flywheel varies. The varying distance between the slider and the center of rotation leads to a variable inertial mass. This passive inertial mass has a potential to reduce the speed fluctuations of the drive. A comparative study has been made on the effects of the variable inertia flywheel on the hydraulic motor speed fluctuations with that of the fixed inertia flywheel. In this respect, a bond graph model of the hydraulic motor drive with the variable inertia flywheel and the fixed inertia flywheel is developed to analyze their performances. The variable inertia generated by the variable inertia flywheel reduces the hydraulic motor speed fluctuations in response to the changes in the excitation inputs. The tests were conducted to validate the model for step change in speed of the hydraulic motor. The test results of the hydraulic motor speed response are found in good agreement with the predicted response. The proposed design of the flywheel reduces the peak speed of the hydraulic motor that enhances the reliability and performance of the drive.

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Ji, Wen, Fei Ni, Dinggang Gao, Shihui Luo, Qichao Lv, and Dongyuan Lv. "Electromagnetic Design of High-Power and High-Speed Permanent Magnet Synchronous Motor Considering Loss Characteristics." Energies 14, no. 12 (June 18, 2021): 3622. http://dx.doi.org/10.3390/en14123622.

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The motor is an important part of the flywheel energy storage system. The flywheel energy storage system realizes the absorption and release of electric energy through the motor, and the high-performance, low-loss, high-power, high-speed motors are key components to improve the energy conversion efficiency of energy storage flywheels. This paper analyzes the operating characteristics of the permanent magnet synchronous motor/generator (PMSG) used in the magnetically levitated flywheel energy storage system (FESS) and calculates the loss characteristics in the drive and power generation modes. Based on this, the electromagnetic part of the motor is optimized in detail. Aiming at this design, this paper calculates the loss characteristics of driving and power generation modes in detail, including its winding loss, core loss, rotor eddy current loss and mechanical loss. The calculation results show that the design meets the loss requirements. It can reduce the no-load loss of the permanent magnet synchronous motor at high speed and improve the energy conversion efficiency, which gives this system practical application prospects.

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Song, Fei, and Shiyin Qin. "Robust Fault-Tolerant Control for Satellite Attitude Stabilization Based on Active Disturbance Rejection Approach with Artificial Bee Colony Algorithm." Mathematical Problems in Engineering 2014 (2014): 1–17. http://dx.doi.org/10.1155/2014/512707.

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This paper proposed a robust fault-tolerant control algorithm for satellite stabilization based on active disturbance rejection approach with artificial bee colony algorithm. The actuating mechanism of attitude control system consists of three working reaction flywheels and one spare reaction flywheel. The speed measurement of reaction flywheel is adopted for fault detection. If any reaction flywheel fault is detected, the corresponding fault flywheel is isolated and the spare reaction flywheel is activated to counteract the fault effect and ensure that the satellite is working safely and reliably. The active disturbance rejection approach is employed to design the controller, which handles input information with tracking differentiator, estimates system uncertainties with extended state observer, and generates control variables by state feedback and compensation. The designed active disturbance rejection controller is robust to both internal dynamics and external disturbances. The bandwidth parameter of extended state observer is optimized by the artificial bee colony algorithm so as to improve the performance of attitude control system. A series of simulation experiment results demonstrate the performance superiorities of the proposed robust fault-tolerant control algorithm.

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Gu, Hai Rong, Sheng Jie Jiao, Chong Yu Xiao, Yi Min Liu, and Fu Chun Wang. "Flywheel Energy Storage Used in Enhancing the Construction Machinery Engine Speed Stability." Applied Mechanics and Materials 34-35 (October 2010): 1881–85. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1881.

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To study the flywheel storage energy in enhancing the construction machinery engine speed stability, Dynamic model on engine and engine connecting another flywheel is established. With a group of experiment data, load changing effecting the engine speed is compared when the storage energy flywheel is assembled and not. The results indicate that high frequency engine speed fluctuating is less when the storage energy flywheel is assembled, the drive and economy performance is better, and added energy loss is only for friction.

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Zhang, Xiu Hua, Guang Xi Li, and Long Nie. "The Dynamic Analysis of High-Speed Energy Storage Flywheel Rotor System." Materials Science Forum 770 (October 2013): 78–83. http://dx.doi.org/10.4028/www.scientific.net/msf.770.78.

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This article aims at large-scale energy storage flywheel rotor system, obtaining the dynamic characteristics. Through theoretical analysis, and after doing a simulation analysis for a given flywheel rotor on the 0-20000 RPM, getting the flywheel rotor critical speed, the transient analysis and imbalance response. The system is in steady state at runtime according to the analysis results. Providing also certain theory basis for study of flywheel rotor system according to the analysis method .

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Dissertations / Theses on the topic "Flywheel speed"

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Forslid, Erik, and Jacob Mattsson. "Measurement technique for high speed flywheel." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226221.

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Kamf, Tobias. "High speed flywheel design : Using advanced composite materials." Thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-181256.

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This thesis is a part of a larger project that focuses on the development of a highspeed, high energy flywheel using both high-tech composites and levitating magneticbearings alongside a custom made, permanent magnetized generator built into theflywheel itself. The goal of the project is then to integrate this flywheel into anelectrical vehicle.The main focus of this thesis is the composite material. The composite is to be usedas a shell around the flywheel rotor. This composite shell fills two purposes. The firstis to act as the main energy carrying material, storing above 75% of the total energy inthe flywheel. The second purpose it to strengthen the machine, holding it together.This so that higher speeds than normally possible can be achieved, with the goal beingset to 30 000rpm.In order to be able to design the composite shell correctly a method of calculating theload stresses had to be developed. This was done by the creation of a Matlabprogram, named Spin2Win, capable of calculating the stresses inside a compositemetal hybrid flywheel. Using said Matlab code, combined with modelling andsimulations from SolidWorks, a fully-fledged flywheel was designed complete withdrawings and material specifications.The composite analysis surprisingly shows that the best combination of compositematerials is a mixture of both high strength carbon fibres alongside softer glass fibrescoupled with the weight of the central core. This allowed for control of the radialstresses which was shown to otherwise be the limiting factor when designing rotatingcomposite materials.One of the most interesting, and perhaps even unique, parts of the design is that theelectrical machine has been integrated into the flywheel’s composite shell. Having thetwo entities working together in order to control the radial stresses in thecomposite, by utilizing the weight of the permanent magnets.

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Ho, Tracey 1976. "High-speed permanent magnet motor generator for flywheel energy storage." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80068.

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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
Includes bibliographical references (p. 139).
by Tracey Chui Ping Ho.
S.B.and M.Eng.

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Talebi, Rafsanjan Salman. "Advanced high-speed flywheel energy storage systems for pulsed power application." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3163.

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Okou, Richard. "High Speed flywheel and test rig design for rural energy storage." Doctoral thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/5130.

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There is considerable growth in the renewable energy sector to contribute to sustainable development, environmental conservation and most importantly to provide affordable energy to isolated rural communities of sub-Saharan Africa. Renewable energy sources such as solar and wind require energy storage since the source of energy is intermittent. Electrochemical batteries especially from lead acid are commonly used to store energy in Solar Home Systems (SHS) for rural electrification in sub-Saharan Africa. Disadvantages such as low efficiencies, low life cycle costs, high maintenance, comparatively short life and serious environmental and human toxicity effects exist. Since recycling is not widespread, replacement costs are high, as are the resultant environmental damage and health hazards from lead and sulphuric acid. In this thesis, an electromechanical flywheel energy storage device is proposed as an alternative to a lead acid battery in order to increase efficiency, life expectancy, increased high depth of discharge, low life cycle cost and elimination of adverse environmental effects. Due to income and service skill constraints in rural areas, the proposed, high speed flywheel systems (for long time energy storage) will require the use of low cost configurations and topologies, special considerations on the flywheel rotor profile design, robust electrical machines, simple power electronics and a low cost bearing set. Low loss magnetic bearings are also possible but were limited by time while also making their maintenance complex especially in rural areas. Conventional high strength composite materials used in flywheel rotor manufacture for high speed operation are expensive. Therefore there is a need to develop techniques to profile the rotor shape so as to improve on material usage and exhibit lower mechanical stresses. A robust electrical machine topology for high speed operation and a simple drive system are investigated to ensure simple assembly, low cost and low maintenance. vii The various flywheel components were designed using analytical and numerical methods. Two techniques were used to develop two optimal profiles for the flywheel rotor structure. Partial differential equations and analytical solutions were employed to develop the profiles. Analytical equations were used to design the electrical machine, drive, bearing system and other accessories. The final electromechanical battery prototype consisted of a composite flywheel rotor made from E-glass fibre materials, double rotor Axial Flux Permanent Magnet (AFPM) machine and a drive system using Brushless DC (BLDC) mode of operation. The system was designed for 300Wh of energy storage for the delivery of 100W and 500W of power and an operating speed range of 8,000 rpm-25,000 rpm. The design and development of the flywheel energy storage system and test rig using locally available materials was investigated. Experiments were conducted for speeds up to 6,000 rpm. The electromechanical battery was able to store a maximum of 77Wh of energy. The shortfall of the system to meet its design specifications was investigated and found to have been caused by vibrations resulting from prototyping issues. A thermal model was developed to predict the temperature rise in the system which showed a good correlation with the experimental results.

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Conteh, Michael Abu. "ENHANCEMENT OF HIGH-SPEED FLYWHEEL ENERGY STORAGE VIA CARBON-FIBER COMPOSITE REINFORCEMENT." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/dissertations/1191.

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This study on the enhancement of high-speed flywheel energy storage is to investigate composite materials that are suitable for high-speed, high-energy density for energy storage and/or energy recovery. The main motivation of the study is to explore the application of the flywheel in the aviation industry for recovering some of the energy that is currently being lost at the wheel brakes of an aircraft due to the high temperature developed in the brake stack as a result of landing, frequent brake applications during taxiing in or out of heavy traffic airports and rejected take-off. Lamina and laminate mechanical properties of materials suitable for flywheel high-speed energy storage were investigated. Design and optimum stress analysis were used to determine the shape factor, maximum stress and energy density for a flywheel with a constant stress disk and a constant thickness rim. Analytical studies along with the use of the CADEC-online software were used to evaluate the lamina and laminate properties. This study found that the use of hybrid composite material with higher strength (based on first ply failure strength) and lower density and lower elastic moduli for the disk than the rim material will yield high-speed and high-energy density. The materials designed based on the results from this study show outperformance compared to previous published results of standard flywheel material combinations. The safe rotational velocity and energy density were found to be 166,000 RPM and 2.73 MJ/kg respectively. Therefore, results from this study will contribute to aiding further development of the flywheel that has recently re-emerged as a promising application for energy storage due to significant improvements in composite materials and technology. Further study on flywheel energy recovery from aircraft brakes revealed that more than half of the energy dissipated at the wheel brake as heat could be recovered and converted to some useful form. In this way, the operating life of the brakes can be prolonged. The total additional weight to the aircraft was found to be less than 0.2% of the maximum take-off weight. This additional weight can be offset by reducing the design payload while ensuring that the structural efficiency of the aircraft is not altered. It was also found that applying this method of flywheel energy recovery to active commercial Boeing-777 aircraft will result in savings equivalent to the annual carbon emission of a 6 MW fossil fuel power plant. This will also contribute to the aviation industry climate change mitigation.

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Shah, Sejul. "The design and development of a high speed composite flywheel for hybrid vehicles." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/7847.

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Cusack, Jessy L. "Design of a High Speed Clutch with Mechanical Pulse-Width Control." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-theses/173.

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Kinetic energy storage via flywheels is an emerging avenue for hybrid vehicle research, offering both high energy and power density compared to more established electric and hydraulic alternatives. However, connecting the high speed flywheel to the relatively low speed drivetrain of the vehicle is a persistent challenge, requiring a transmission with high variability and efficiency. A proposed solution drawing inspiration from the electrical domain is the Switch-Mode Continuously Variable Transmission (SM CVT), which uses a high speed clutch to transfer energy to a torsion spring in discrete pulses with a variable duty cycle. The greatest limitation to the performance of this system is the speed and efficiency of commercial clutch technology. It is the goal of this thesis to develop a novel clutch which meets the actuation speed, controllability, and efficiency requirements of the SM CVT, with potential for reapplication in other rotary mechanical systems with switching functionality. The performance demands of the clutch were derived via a theoretical design case based on the performance requirements of a typical passenger vehicle, indicating the need for a sub-millisecond engagement and disengagement cycle. This is not met by any conventional clutch. Several concepts were considered across the fluid, electromagnetic and mechanical energy domains. A final concept was chosen which employs a friction disk style architecture, with normal force produced by compressing springs via an axial cam mounted to the flywheel. To control duty cycle, the cam was designed with a radially varying profile such that increasing radial position results in proportionally increasing ratio of high dwell to low dwell. Three synchronized followers are then translated radially on the cam by a control linkage. Analysis of the follower train dynamics and system stiffness were carried out to inform the design of a scaled benchtop prototype. Experimental testing was carried out to characterize the performance of the prototype. It was found that the intended functionality of the design was achieved, with discrete energy transfer accomplished via pulsing of the clutch. However, maximum efficiency was only 33% and torque capacity was only 65% of the intended 70Nm. Significant opportunity exists for improvement of the clutch performance in future research.

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Park, Jae Do Hofman Heath F. "Modeling and control of a high-speed solid-rotor synchronous reluctance flywheel motor/generator." [University Park, Pa.] : Pennsylvania State University, 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1881/index.html.

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Schaible, Uwe. "An integrated high speed flywheel energy storage system for peak power transfer in electric vehicles /." *McMaster only, 1997.

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Books on the topic "Flywheel speed"

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V, Brown Gerald, Jansen Ralph H, and NASA Glenn Research Center, eds. Estimator based controller for high speed flywheel magnetic bearing system. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Book chapters on the topic "Flywheel speed"

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Jiawei, Zhang, Zhao Hui, and Ma Kemao. "Phase-Locked Loop in Constant Speed Control System for the Flywheel Motor." In Recent Advances in Computer Science and Information Engineering, 323–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25778-0_45.

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Higasa, Hiromasa. "Findings for Optimal Design of Super speed Flywheel Energy Storage System with Superconducting Magnetic Bearing." In Advances in Superconductivity XII, 800–802. Tokyo: Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-66877-0_236.

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Mansour, Mohamed, M. N. Mansouri, and M. F. Mimouni. "Performance Evaluation of a Flywheel Energy-Storage System Associated to a Variable-Speed Wind Generator." In Sustainability in Energy and Buildings, 201–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27509-8_16.

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Siostrzonek, Tomasz, Stanisaw Pirg, and Marcin Baszyski. "The High-Speed Flywheel Energy Storage System." In Energy Storage. Sciyo, 2010. http://dx.doi.org/10.5772/10096.

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Krack, Malte, Marc Secanell, and Pierre Mertiny. "Rotor Design for High-Speed Flywheel Energy Storage Systems." In Energy Storage in the Emerging Era of Smart Grids. InTech, 2011. http://dx.doi.org/10.5772/18359.

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Okedu, Kenneth. "Assessing Grid Frequency Performance Using Flywheel-Based Variable-Speed Drive and Energy Capacitor Systems." In Onshore Wind Farms, 10–1. AIP Publishing, 2021. http://dx.doi.org/10.1063/9780735422995_010.

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Okedu, Kenneth. "A variable-speed wind turbine flywheel-based coordinated control system for enhancing grid frequency dynamics." In Onshore Wind Farms, 9–1. AIP Publishing, 2021. http://dx.doi.org/10.1063/9780735422995_009.

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Pullen, Keith R., and Mustafa E. Amiryar. "High Speed Flywheels." In Reference Module in Earth Systems and Environmental Sciences. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-819723-3.00081-0.

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Bibik, Olena, and Oleksandr Popovich. "INCREASING THE EFFICIENCY OF ELECTRIC DRIVES WITH PERIODICAL LOADING BY USING COMPREHENSIVE MATHEMATICAL MODELING MEANS." In Priority areas for development of scientific research: domestic and foreign experience. Publishing House “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-049-0-31.

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The mode of operation of induction motors (IMs) affects their performance. In most cases, motors are optimally designed for steady state operation. When operating in other modes, additional attention is required to the problems of energy efficiency. Induction motors are the most common type of electromechanical energy converters, and a significant part of them operate under conditions of periodic changes in the load torque. The work is devoted to solving the problem of increasing the energy efficiency of asynchronous motors of electromechanical systems with a periodic load, including pumping and compressor equipment. The traditional solution to this problem for compressor equipment is the optimal design of an IM under static conditions, as well as the use of flywheels, the use of an IM with an increased slip value and controlled IM with a squirrel-cage rotor and with frequency converters. In this work, the modes of operation of asynchronous motors with periodic loading are investigated. For this, complex mathematical models are developed in the simulation system. Such models are effective in modeling taking into account periodic load changes: repetitive transient processes, their possible asymmetry and non-sinusoidality, increased influence of nonlinearity of electromagnetic parameters. In complex mathematical modeling, the mutual influence of the constituent parts of the electromechanical system is taken into account. Simulation allowed quantifying the deterioration in energy efficiency under intermittent loading, in comparison with static modes. Criteria for evaluating quasi-static modes have been developed and areas of critical decrease in efficiency have been determined. The paper proposes and demonstrates a methodology for solving this problem. For this purpose, tools have been created for the optimal design of asynchronous motors as part of electromechanical systems with periodic loading. These tools include: complex mathematical models of electromechanical systems with asynchronous motors with periodic load, mathematical tools for determining the parameters of quasi-steady-state modes, the methodology of optimal design based on the criterion of the maximum efficiency of processes under quasi-steady-state modes of operation. The possibilities, advantages and prospects of using the developed mathemati-cal apparatus for solving a number of problems to improve the efficiency of electric drives of compressor and pumping equipment are demonstrated. It is shown that by taking into account quasi-static processes, the use of complex mathematical models for the optimal design of asynchronous motors with a periodic load provides an in-crease in efficiency up to 8 ... 10%, relative to the indicators of motors that are de-signed without taking into account the quasi-static modes. The areas of intense quasi-steady-state modes are determined using the devel-oped criterion. In these areas, there is a critical decrease in efficiency compared to continuous load operation. A decrease in efficiency is associated with a decrease in the amount of kinetic energy of the rotating parts compared to the amount of electromagnetic energy. In connection with the development of a frequency-controlled asynchronous drive of mechanisms with a periodic load, the relevance of design taking into account the peculiarities of quasi-static has increased significantly. For example, a variable frequency drive of a refrigerator compressor or a heat pump can increase energy efficiency up to 40%, but at low speeds, due to a decrease in kinetic energy, the efficiency can decrease to 10 ... 15%, unless a special design methodology is applied. This problem can be solved by using the complex mathematical modeling tools developed in the article.

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Conference papers on the topic "Flywheel speed"

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Li, Meng, Xinxiu Zhou, and Ran Zhang. "Magnetically suspend flywheel rotor speed nonlinear control." In 2014 IEEE International Conference on Robotics and Biomimetics (ROBIO). IEEE, 2014. http://dx.doi.org/10.1109/robio.2014.7090673.

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Dever, Timothy, Gerald Brown, Ralph Jansen, Peter Kascak, and Andrew Provenza. "Magnetic Bearing Controller for High Speed Flywheel System." In 1st International Energy Conversion Engineering Conference (IECEC). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-6108.

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Kefauver, Kevin R., Gregory C. Walsh, Louis P. Hromada, James A. Kirk, and Ronald B. Zmood. "A 50 Wh Open Core High-Speed Flywheel." In 34th Intersociety Energy Conversion Engineering Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1999. http://dx.doi.org/10.4271/1999-01-2615.

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Kelsall, D. R. "Pulsed power promsion by high speed composite flywheel." In IEE Symposium Pulsed Power 2000. IEE, 2000. http://dx.doi.org/10.1049/ic:20000285.

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Sun, Guangyoung. "Magnetic Relevitation of Flywheel Rotor With High Speed Backward Whirl." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85049.

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In this paper, the magnetic relevitation is conducted for a flywheel rotor rotating at 40,000 rpm in contacts with auxiliary bearings through numerical simulations. The high-speed flywheel rotor loses the magnetic suspensions and touches down onto the auxiliary bearings. Then, active magnetic bearings (AMB) relevitate the flywheel rotor in whirling and bouncing motion when the magnetic power is restored. To achieve this rotor dynamics control in challenge, three control algorithms are utilized and their performances are compared based on the steady-state response with respect to a bearing reference center and the power loss of AMBs required for the relevitation as the friction coefficient on rotor/auxiliary bearing contacts. The simulation results show that the sliding mode control (SMC), which is robust to dynamic uncertainty and nonlinear dynamics, is superior to the conventional linear controllers such as the PD and the LQR in the control performance and efficiency. Furthermore, the SMC successfully relevitates the flywheel rotor with a high-speed backward whirl, while the linear controllers fail to do.

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Zhang, Jian, Yongde Zuo, Xingjiang Chen, and Qinghong Zhang. "Research on the Structure Integrity Analysis of Flywheel of Reactor Coolant Pump in Nuclear Power Plant." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66591.

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Abstract:

The flywheels on reactor coolant pump motors provide inertia to ensure a slow decrease in coolant flow in order to prevent fuel damage as a result of a loss of power to the pump motors. During operation at normal speed, a flywheel has sufficient kinetic energy to produce high-energy missiles and excessive vibration of the reactor coolant pump assembly if the flywheel failed. Overspeed of the pump rotor assembly during a transient increases both the potential for failure and the kinetic energy of the flywheel. The safety consequences could be significant because of possible damage to the reactor coolant system, the containment, or other equipment or systems important to safety. Usually, the design of connection between flywheel and pump rotor has two types, one is keyway, and the other is rotor shrink fitting. This paper has done the research on the analysis of the integrity of flywheel in design rules and guidelines, such as NUREG, RG and NB, which have given the allowable stress limits but not given the potential for failures types and the stress verification type. So the stress verification of the flywheel is different in different technicals and structures. Some papers also have different analysis methods in China. This paper considers the failures mode of flywheel, using the analytical method in THEORY OF ELASTICITY and Tresca criteria to give the method of the stress analysis of flywheel. Next, this paper pays attention on the analysis of the flywheel integrity about two connection types, and gives the other requirements of integrity. Such as stress analysis, fatigue analysis, ductile failure analysis, non-ductile failure analysis, crack propagation analysis etc.

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Boztas, Gullu, and Omur Aydogmus. "Design of a High-Speed PMSM for Flywheel Systems." In 2019 4th International Conference on Power Electronics and their Applications (ICPEA). IEEE, 2019. http://dx.doi.org/10.1109/icpea1.2019.8911148.

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Liu, Rongqiang, and David Xu. "Induction machine based flywheel speed estimation at stand-by mode." In 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 ECCE-ASIA). IEEE, 2014. http://dx.doi.org/10.1109/ipec.2014.6870127.

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Brunnader, R., C. Deinhammer, B. Schweighofer, H. Wegleiter, and G. Holler. "Condition monitoring of high-speed flywheel using modal analysis method." In 2011 Fifth International Conference on Sensing Technology (ICST 2011). IEEE, 2011. http://dx.doi.org/10.1109/icsenst.2011.6137032.

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Cross, D., and J. Hilton. "High speed flywheel based hybrid systems for low carbon vehicles." In Hybrid & Eco Friendly Vehicles Conference 2008 (HEVC 2008). IEE, 2008. http://dx.doi.org/10.1049/cp:20081062.

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