Relevant bibliographies by topics / Machine rotor

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Machine rotor'

Author: Grafiati
Published: 28 May 2022
Last updated: 29 May 2022

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Journal articles on the topic "Machine rotor"

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Shen, ZhiHuang, Bin Yao, BinQiang Chen, Wei Feng, and XiangLei Zhang. "A Novel Rotor Profile Error Tracing and Compensation Strategy for High Precision Machining of Screw Rotor Based on Trial Cutting of Limited Samples." Shock and Vibration 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/978325.

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The machining precision plays an important role in the operation reliability and service life of screw rotors. However, the actual machined rotor profile of screw rotors is different from its theoretical profile due to the errors of the machine tool. This paper proposes a novel method of error tracing and compensation to reduce the machined errors of rotor profile on the basis of the limited sample trials, and the method is based on a matrix of error compensation. The errors of rotor profile are obtained based on limited sample trials machining of screw rotors,and fitted into piecewise smooth data. A matrix of error compensation is established to compute the errors of rotor profile to generate a compensated rotor profile. The compensated rotor profile is then used to regenerate forming tool and a new rotor product is processed on the same machine tool. And the errors of new rotor profile are smaller and can be reduced within (−0.01 mm, 0.01 mm) after compensations. Finally, the actual machining examples illustrate that the method of error compensation can not only satisfy the machining requirement of high-precision rotors, but also has the characteristics of good stability and applicability.
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Lebedev, Valeriy A., Georgy V. Serga, Irina V. Davydova, Tatiana V. Atoyan, Irina G. Koshlyakova, and Alexander V. Gordienko. "Main trends in intensification of rotor-screw processing of parts." MATEC Web of Conferences 226 (2018): 01008. http://dx.doi.org/10.1051/matecconf/201822601008.

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The ways of productivity increase in details finishing-strengthening processing executed in rotor-screw technological systems are presented. It is shown that the use of rotor-screw machines makes it possible to combine the parts machining using a vibrating field with a large amplitude of oscillations and their transportation in a streamlined form of production organization. Two main directions of rotor-helical processing stimulation are identified: on the basis of structural changes in the screw rotor, as the main working element of the rotor-screw machine and by equipping the screw rotor with activation elements of the process. The classification of screw rotors is presented, which allows purposeful search for the most effective designs of screw rotors and the mechanism is revealed of their influence on the process of parts finishing-hardening processing. Dependence is established for determining the longitudinal movement speed of the parts being processed in the screw rotor. The constructive-technological scheme of the rotor-screw machine is proposed, which allows increase of the productivity of the process and simplification of the design of machines for their implementation, by dismembering the complex screw propulsion of the load mass, which takes place in the screw rotors, into relatively simple in kinematic sense motions. The technological possibilities of rotor-screw processing application for finishing-strengthening operations are presented.
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Manich, A. M., M. D. De Castellar, A. Barella, and L. Castro. "Strength at “Theoretically Null Twist” of Acrylic and Polyester/Cotton Rotor Spun Yarns: Application to Prediction of “Machine Twist”." Textile Research Journal 58, no. 4 (1988): 238–45. http://dx.doi.org/10.1177/004051758805800409.

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Acrylic staple rotor spun yarns (172) obtained from a BD 200 rotor machine fitted with twelve different spinning heads that combined four different rotors and three different yarn extraction nozzles were tested for strength at a theoretically null twist. A high correlation existed between the theoretically null twist strength and the apparent loss of twist or residual twist. We propose a method for assessing the total twist or machine twist of the yarn from the apparent yarn twist measured in a twist tester and from the yarn strength at a theoretically null twist. Tests on fourteen polyester/cotton yarns obtained from a RU 11 machine seem to indicate that this method of assessment may be applied to other materials and other rotor machines.
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Mustafayev, Rauf, Nurali Yusifbayli, and Laman Hasanova. "Matrix structure of unified mathematical model of electric AC machines at control." E3S Web of Conferences 209 (2020): 02023. http://dx.doi.org/10.1051/e3sconf/202020902023.

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The matrix structure of the equations of a generalized electric alternating current machine is proposed, which, based on the Parke equations, is written in the coordinate axes of the machines rotating with the rotor speed. In the matrix structure, the column matrices of the derivatives of the stator, excitation and rotor windings are equal to the product of diagonal matrices consisting of the machine parameters and the column matrices of the flux links themselves and the sum of the matrix columns of the control parameters which are the matrix columns of the stator voltage, excitation voltage, and rotor voltage. It is shown that the matrix structure of a generalized controlled AC machine is transformed into mathematical models of almost all encountered AC electric machines, namely, into a synchronous machine with two excitation windings - a longitudinal and a transverse one; in a synchronous machine with a longitudinal field winding (classic); in an asynchronous machine with a squirrel-cage rotor; into an asynchronous machine with a phase rotor. It has been shown that the matrix structure includes the controls of these machines both from the stator and from the rotor. On the stator side for synchronous machines, it is a frequency control that regulates both the amplitude and frequency of the applied voltage, and on the rotor side, a constant voltage control is supplied to the longitudinal and transverse windings. For asynchronous machines, the stator and rotor are frequency-controlled. The following are examples of frequency control of an asynchronous machine both from the stator and from the rotor.
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Hou, Xukui, Ende Wang, Hui Cao, Yalong Zhu, and Kai Qi. "Research on Dynamic Balance Adjustment Method of Single Braced Frame Gyroscope Rotor." MATEC Web of Conferences 256 (2019): 02005. http://dx.doi.org/10.1051/matecconf/201925602005.

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The uneven mass distribution of gyro rotors results in vibration, rotation and drift of gyro rotors, which seriously affect the performance index and life of gyro rotors. However, because there is no rigid connection between the rotary shaft and the shell of the gyro rotor, the dynamic balancing machine can only balance the vibration component of the single braced frame gyroscope rotor, and can’t measure the gyro rotor’s rotation component. By analyzing the influence of uneven rotor mass distribution on the gyro rotor performance, a method of eliminating two rotational degrees of freedom of the gimbal in gyro rotor by mandrel is proposed, which makes the dynamic balancing machine directly measure the vibration component and the moving component of the gyroscope rotor, and simplifies the dynamic balancing debugging process.
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Gerlach, Martin Enno, Maximilian Zajonc, and Bernd Ponick. "Mechanical stress and deformation in the rotors of a high-speed PMSM and IM." e & i Elektrotechnik und Informationstechnik 138, no. 2 (2021): 96–109. http://dx.doi.org/10.1007/s00502-021-00866-5.

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AbstractHigh-speed electric machines are gaining importance in the field of traction drives and aviation due to their high power density. The evaluation of the mechanical stress in the rotor is one crucial part in the design process for this type of machines. The mechanical stress cannot be measured directly. Accordingly, a validation of the calculated mechanical stress is difficult and normally not performed. Instead of the mechanical stress, the deformation at the rotor surface can be measured using a spin test machine with distance sensors. The deformation can then be used to validate the calculation results.In this paper, the mechanical load exerted on an IM rotor for a $60\,\text{kW}/20000\,\frac{1}{\text{min}}$ 60 kW / 20000 1 min high-speed electric machine and an PMSM rotor for a $75~\text{kW}/25000\,\frac{1}{\text{min}}$ 75 kW / 25000 1 min high-speed electric machine is analysed in detail. The mechanical stress and the deformation are calculated and analysed using a FEM simulation model. Then, a spin test is performed on the two rotors. First, the burst speed is determined by operating two rotor samples above their defined test speed. Then, the deformation is measured at the rotor surface for different operating speeds and the defined test speed. The measurement and the simulation results are compared and discussed.It can be shown that the two designs do not exceed the maximum mechanical stress for the defined operating range. In the deformation measurement of the IM rotor, a plastic deformation up to $\varepsilon _{\text{IM, pl}} = 8$ ε IM, pl = 8 μm and elastic deformation up to $\varepsilon _{\text{IM, el}}=22$ ε IM, el = 22 μm can be seen. In regards to plastics, PMSM rotor expands up to $\varepsilon _{\text{PMSM, pl}}= 5$ ε PMSM, pl = 5 μm. The maximum elastic deformation of the PMSM rotor is $\varepsilon _{\text{PMSM, el}}=40$ ε PMSM, el = 40 μm. The comparison of the calculated and the measured elastic deformation shows good accordance for the two rotor types. Both models are capable of describing the deformation and the state of stress in the rotors. In burst tests, both rotors withstand rotational speeds far above the defined test speed.
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Abdel-Khalik, A. S. "Five-Phase Modular External Rotor PM Machines with Different Rotor Poles: A Comparative Simulation Study." Modelling and Simulation in Engineering 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/487203.

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The performance of fault-tolerant modular permanent magnet machines depends on the proper selection of the pole and slot numbers which result in negligible coupling between phases. The preferred slot and pole number combinations eliminate the effect of low-order harmonics in the stator magnetomotive force and thereby the vibration and stray loss are reduced. In this paper, three external rotor machines with identical machine dimensions are designed with different slots per phase per pole ratios. A simulation study is carried out using finite element analysis to compare the performance of the three machines in terms of machine torque density, ripple torque, core loss, and machine efficiency. A mathematical model based on the conventional-phase-model approach is also used for the comparative study. The simulation study is extended to depict machine performance under fault conditions.
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Tazeyev, I. R., S. O. Gaponenko, A. E. Kondratiev, and A. N. Zamaliev. "MODELING OF THE MACHINE FOR THE BALANCING OF THE ROTOR IN THE ANSYS SOFTWARE COMPLEX." Proceedings of the higher educational institutions. ENERGY SECTOR PROBLEMS 20, no. 5-6 (2018): 75–83. http://dx.doi.org/10.30724/1998-9903-2018-20-5-6-75-83.

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An imbalance appears during the manufacture, operation and maintenance of power equipment. The rotor imbalance arises due to the unbalanced masses of the rotor which leads to the emergence of variable loads on the supports and bending of the rotor. The dynamic balancing of the rotor on the balancing machine is the way to avoid the negative effects of centrifugal forces. The balancing machines in resonant and soft-bearing modes are usually used on modern production. However, these methods of balancing has a number of shortcoming, which can be solved by using the hard-bearing method. For example, an ability of balancing of products with huge imbalance and increasing the accuracy of balancing. Application of soft-bearing balancing method needs to be added in other ways, taking into account high reqiuirments of the power equipment. A model of a hard-bearing balancing machine was designed for balancing rotors and rotating elements of power equipment. The Autodesk Inventor CAD software was used for modeling of the balancing machine and the rotor. The modal analysis was conducted by using the block method of Lanczos on the basis of the ANSYS system. The main assumption during the modal analysis process was that the form of free fluctuations is calculated in relative units and does not allow to determine absolute shifts. The natural oscillation frequencies of the 3D models of the balancing machine bed and the rotor of the gas turbine engine 16M were calculated to determine the informative frequency range that the rotor should be hard-bearing balanced.
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Domracheva, Yulia, and Sergey Loginov. "Simulation Technique of Synchronous Reluctance Bearingless Machine." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (August 8, 2015): 101. http://dx.doi.org/10.17770/etr2013vol2.845.

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Magnetically levitated rotor electric machines can be used under such conditions wherein application of conventional bearings is impossible because of presence of lubrication. Active magnetic bearings application requires rotor length increase and stalling speed is decreased. Bearingless electric machines are the next step up of the magnetically levitated rotor machines. A bearingless electric machine module generates electromagnetic torque and radial forces. This feature makes possible to decrease the rotor length on retention of capacity of torque and forces. It is necessary to verify a control system operation algorithm via simulation model owing to complexity of machine electromagnetic interaction. It is practical to use a variable attribute set model for this purpose. The following article considers one of these models for researching the system via MATLAB Simulink. Basic relations for programmatic model creation are presented. Comparative assessment of various machine model types is made.
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Sultan, Ibrahim A. "Profiling Rotors for Limaçon-to-Limaçon Compression-Expansion Machines." Journal of Mechanical Design 128, no. 4 (2005): 787–93. http://dx.doi.org/10.1115/1.2202877.

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Limaçon-to-limaçon compression-expansion machines have housings and rotors whose profiles are manufactured of limaçon curves. For these machines to perform satisfactorily, extreme care should be given to the geometric particulars of their rotor profile. The main characteristics that govern the quality of the rotor profile are the volumetric efficiency and the prevention of interference. In this work, the interference problem is handled from two different mathematical standpoints: the slope of tangents to both the rotor and housing curves at the apices; and the value of the minimum radial clearance that separates the two limaçon curves. In the first case, mathematical expressions, relating the radii of the limaçon base circles is presented to ensure that interference would not take place during normal operations of the limaçon-to-limaçon machine. The second mode of analysis produces a set of nonlinear equations that can be solved to obtain a value of the radial clearance. This value has to be machined off the rotor profile to prevent interference. A numerical example is given at the end of the paper to prove the validity of the models proposed and graphs are produced to support the claims presented.
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Dissertations / Theses on the topic "Machine rotor"

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Xie, Lihan. "Suivi numérique des bifurcations pour l'analyse paramétrique de la dynamique non-linéaire des rotors." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI018/document.

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Au cœur des moyens de transport, de transformation d'énergie, et de biens d'équipements, les machines tournantes peuvent avoir des comportements dynamiques complexes dus à de multiples sources de non linéarités liées aux paliers hydrodynamiques, à la présence de fissures, aux touches rotor-stator, ... Des phénomènes comme les décalages fréquentiels et donc de vitesses critiques, les cycles d'hystérésis avec sauts d'amplitudes, le changement brutal du contenu fréquentiel des réponses, sont des expressions de ces comportements. Résoudre les équations du mouvement induites par des modélisations avec des éléments finis de type poutre ou volumique, pour calculer les réponses à des sollicitations diverses (comme le balourd ou le poids propre), est réalisable avec des méthodes d'intégration pas à pas dans le temps mais au prix de temps de calcul prohibitifs. Cela devient particulièrement préjudiciable au stade du pré-dimensionnement où il est nécessaire de réaliser rapidement des études paramétriques. Aussi une alternative intéressante est de mettre en {\oe}uvre une méthode numérique, à la fois générale et efficace pour analyser la réponse non linéaire des rotors en régime stationnaire. La démarche proposée combine, dans un premier temps, la méthode de la balance harmonique (HBM) et la technique de bascule Temps-Fréquence (AFT) afin d'obtenir rapidement dans le domaine fréquentiel les réponses périodiques des rotors à grand nombre de degrés de liberté apportés par les éléments finis volumiques. Puis, l'association à la méthode de continuation par pseudo-longueur d'arc aboutit à établir continûment l'ensemble des solutions d'équilibre dynamique sur la plage de vitesse de rotation. Enfin la stabilité dynamique locale de la solution périodique est analysée grâce à des indicateurs de bifurcation basés sur l'évolution des exposants de Floquet. Ainsi sont détectées les bifurcations de branches de solutions périodiques de type point limite, point de branchement et notamment Neimark-Sacker. Leur localisation est déterminée précisément en résolvant un système augmenté constitué de l'équation du mouvement et d'une équation supplémentaire caractérisant le type de bifurcation considéré. En déclarant un paramètre du système (coefficient de frottement, jeu rotor/stator, amplitude de l'excitation,...) comme nouvelle variable, l'utilisation de la technique de continuation conjointement avec le système augmenté détermine directement le cheminement des bifurcations en fonction de ce paramètre sur la nappe des réponses non linéaires. Les suivis de bifurcations délimitent les zones de fonctionnement spécifiques, extraient efficacement l'essentiel du comportement dynamique et offrent ainsi une nouvelle approche pour dimensionner de façon efficace les systèmes notamment en rotation. Nombre des développements réalisés sont implantés dans le code de calcul Cast3M<br>Generally speaking, the rotating systems utilized in the energy production have a small rotor-stator gap, are able to run during long periods, and are mounted on hydrodynamic bearings. Rotor-stator interactions in case of blade loss, crack propagation due to fatigue, and a variable stiffness due to the nonlinear restoring forces of the bearings can make the rotordynamics nonlinear and the responses complicated: significant amplitude and frequency shifts are introduced, sub- and super-harmonics appear, and hysteresis occurs. It is of great importance to understand, predict and control this complicated dynamics. Due to the large number of DOFs and the broad range of study frequency, the computation time for solving the equations of motion by a temporal integration method can be quite prohibitive. It becomes particularly disadvantageous at the design stage where a parametrical study need to be quickly performed. An alternative numerical method, which is general and effective at the same time, is proposed in order to analyse the nonlinear response of the rotors at steady state. Firstly, the periodic responses of nonlinear rotors are calculated in the frequency domain by combining harmonic balance method (HBM) and alternating frequency-time (AFT). With the help of continuation method, all dynamic equilibrium solutions of nonlinear systems are determined for the range of study frequency. Then, Floquet exponents which are the eigenvalues of Jacobian are sought for stability analysis of periodic solutions. Then the local stability of the periodic solution is analysed through the bifurcation indicators which are based on the evolution of Floquet exponents. The bifurcations of periodic solution branch, such as limit point, branch point, and Neimark-Sacker bifurcation, are thus detected. By declaring a system parameter (friction coefficient, rotor / stator gap, excitation amplitude, ...) as a new variable, applying once again the continuation method to the augmented system determines directly the bifurcation's evolution as a function of this parameter. Thus, parametric analysis of the nonlinear dynamic behaviour is achieved, the stability boundary or the regime change boundary is directly determined. Numerous developments are implemented in the calculation code Cast3M
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SEGAYER, AHMED MOHAMMED. "ROTOR STATOR CONTACT IN A ROTATING MACHINE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34202@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>O crescente avanço da tecnologia de equipamentos rotativos tem exigido dos projetistas de máquinas adapta-los às condições de operação mais rigorosas e, consequentemente, projetos mais sofisticados. O aumento da eficiência é frequentemente realizado por operações de minimização de folga entre os elementos rotativos e estacionários e/ou aumento da velocidade de rotação do rotor. A natureza das funções e o custo elevado dos equipamentos rotativos de alta velocidade exigem precisão e segurança no projeto para evitar riscos de operação. Quando o rotor entra em contato com o estator, este pode exibir um comportamento dinâmico fascinante cujo movimento depende de impacto, atrito, e efeitos giroscópicos. Grande parte das preocupações dos engenheiros com relação a vibrações em máquinas rotativas leves e de alta velocidade deve-se aos seus efeitos destrutivos sobre o sistema do estator. Interação devido ao efeito do rubbing entre o conjunto do rotor e sua respectiva carcaça um dos principais causadores de falhas em máquinas rotativas. As forças e tensões desenvolvidas como resultado de pequenas folgas podem resultar em desgaste, perda de desempenho, redução de estabilidade, ruído, calor e vibrações. Obter maior conhecimento sobre este fenômeno torna-se extremamente importante para melhorar a capacidade de proteger o sistema de possíveis danos. O fator chave para almejar este objetivo é continuamente aumentar a habilidade de prever a resposta dinâmica com precisão para então garantir a estabilidade do sistema do rotor. Neste âmbito, o presente trabalho apresenta um estudo teórico, com simulação numérica e validação experimental como objetivo de melhorar nosso conhecimentos sobre o fenômeno.<br>Increasing demands for high performance, yet reliable operation of rotating machinery continues to increase and have placed stringent requirements on designers and developers to produce efficient, trouble-free rotating machinery. The performance of high-performance turbomachinery can be enhanced by decreasing clearance between rotating parts and housing and/or by increasing the rotor velocity. When a rotor touches upon a boundary, it can exhibit a quite fascinating dynamical behavior and its motion depends on impact, friction, and gyroscopic effects. A large portion of the engineering concern with vibration in high speed rotating machinery results from its destructive effects on the stator system. Rub interactions between a rotor assembly and its corresponding casing structure has been one of the major causes for machine failure. The forces and tensions developed as a result of such clearances can result in wear, loss of performance, reduction of the stability, noise, heat and vibration. Gaining increased knowledge about rnb-related phenomena is important for improving the ability to protect a machine from damage. A key factor in achieving this objective continues to be the ability to accurately predict the dynamic response and stability of a rotor system. This work presents theoretical study, with numerical simulation and experimental validation to improve our knowledge about this phenomena.
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Sparv, Lisa. "Cooling simulation of a BEV electrical machine rotor." Thesis, KTH, Fordonsdynamik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302143.

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The thesis work described in this report is about simulation of the cooling of an electrical machine rotor. Limitations and simplifications were made on the CAD model of the rotor with the purpose of reducing the simulation time, for it to then be used for CFD-simulations using STAR-CCM+. This was done to see the temperature, as well as its distribution, in the model. By changing various parameters, one at the time whilst the rest were kept at their assigned standard values, the changes could be analysed and thereafter compared. The tests include smaller geometry changes, parameters of the coolant and its flow, parameters for the airgap and the materials in the laminates and the material around the magnets, as well as changes in loss values. The simulations for geometry changes involving the magnets and their surrounding material resulted in minor temperature increases. An inner rotor radius increase gave a relatively large temperature decrease (although this change would be more difficult to make in practice). Most of the mean values of the temperature changes in the regions of the model were within 10% from the standard simulation used. Increased thermal contact resistance between the Bakelite and the laminates, and increased losses had the worst impact on the cooling. Meanwhile the changes in coolant parameters (as well as the its inlet temperature and mass flow) and reduced losses had the best impact on the cooling. Generally, the temperature distributions looked similar for the different simulations. There were more differences in the distributions for the simulations with changed material properties or thermal contact resistance.<br>Examensarbetet som beskrivs i denna rapport handlar om simulering av kylningen av en elmaskinsrotor. Avgränsningar och vissa förenklingar gjordes på en CAD modell av rotorn för att reducera simuleringstiden. Sedan användes CFD-simuleringsprogrammet STAR-CCM+ för att simulera temperaturfördelningen i modellen. Genom att ändra olika parametrar, en åt gången medan resten hölls vid sina bestämda standardvärden, kunde förändringarna undersökas och sedan jämföras. Det som testades inkluderar bland annat mindre geometriförändringar, parametrar för kyloljan och dess flöde, parametrar för luftgapet och materialen i laminaten och runt permanentmagneterna, samt förlustförändringar. Geometriförändringarna som gjordes för magneterna och det omgivande materialet gav små temperaturökningar. En ökad inre radie på rotorn gav relativt stor temperaturminskning (men denna ändring vore svårare att genomföra på rotorn i praktiken). Majoriteten av medelvärdena av modellregionernas temperaturförändringar var inom 10% från standardsimuleringen som användes. Ökat termiskt kontaktmotstånd mellan Bakeliten och laminaten samt ökade förluster hade sämst påverkan för kylningen, medan förändring i kylvätskans egenskaperna (samt inflödestemperaturen och massflödet) samt minskade förluster hade bäst inverkan. Generellt så såg temperaturfördelningarna lika ut för de olika simuleringarna. Det var främst när materialegenskaperna eller det termiska kontaktmotståndet ändrades som fördelningen såg annorlunda ut.
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Wills, Dominic. "Methods to quantify and reduce rotor losses in a solid rotor yoke permanent magnet machine." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4014.

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Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Certain types of electric machines are particularly susceptible to the proliferation of eddy currents flowing within the solid conducting regions in the rotor. Single-layer, non-overlapping windings within uneven open slots are some stator properties that can produce damaging, asynchronous magnetic field harmonics which manifest in the rotor as eddy currents. The ohmic losses caused by these eddy currents are a source of inefficiency and can cause a marked increase in the temperature of the rotor. This temperature rise can be dangerous for the magnets, which have to be kept within temperature limits to avoid partial or full demagnetization. The research work presented here is concerned with reducing the effect of eddy currents in the rotor magnets and solid rotor yoke of an electric machine. The work presents analytical methods to calculate the magnetic fields, eddy currents and solid loss in an electric machine due to current in the winding and due to the interaction of the permeance variation in the stator with the magnets in the rotor. A method is also suggested where the analytical theory can be used with a magnetostatic finite element solution to produce a transient solid loss result. The research work also investigates a method for optimal segmentation in both level and penetration, and provides some design suggestions. The work presents the method of partial magnet segmentation, which is a technique whereby thin incisions are made into the magnet material from one or both sides. Another method of partial rotor segmentation is also presented where the incisions are made into a portion of the magnet-facing solid yoke. These methods attempt to interrupt the flow of eddy currents and increase the resistance ‘seen’ by the eddy currents, while also keeping construction difficulty and cost to a minimum. The methods are verified using finite element calculations which are compared to measured results. The result is that partial magnet segmentation is a very useful, effective and practical method of segmenting magnets. The loss reduction profile can be similar to that of traditional full segmentation. The method of partial rotor segmentation also shows a large reduction in rotor power loss. With implementation of these methods on a test machine, one can expect an efficiency increase of more than 4 %<br>AFRIKAANSE OPSOMMING: Sekere tipes van elektriese masjiene is veral sensitief vir die vloei van werwelstrome in solied geleidende gebiede in die rotor. Enkellaag, nie-oorvleuelende wikkelings in oneweredige oop gleuwe is enkele stator eienskappe wat skadelike, asinchrone magneetveld harmonieke tot gevolg kan hê, wat as werwelstrome in die rotor manifesteer. Die ohmiese verliese wat deur hierdie werwelstrome teweeg gebring word is 'n bron van ondoeltreffendheid en kan lei tot 'n merkbare toename in die temperatuur van die rotor. Hierdie temperatuur styging hou gevaar in vir die magnete en moet binne temperatuur limiete gehou word om gedeeltlike of self volle demagnetisering te vermy. Die navorsing vervat in hierdie document is gemoeid met die vermindering van die effek van werwelstrome in die rotor magnete en in die soliede rotor juk van 'n elektriese masjien. Die werk bied analitiese metodes aan vir die berekening van die magneetvelde, werwelstrome en soliede verliese in ’n elektriese masjien as gevolg van strome in die wikkelings en die interaksie van die permeansie variasie van die stator met die magnete in die rotor. ’n Metode word ook voorgestel waar die analitiese teorie saam met ’n magnetostatiese eindige element oplossing gebruik word om ’n resultaat vir die oorgang soliede verliese te verkry. Die navorsingswerk ondersoek ook ’n metode vir die optimale segmentering in beide vlak sowel as penetrasie, en verskaf sekere ontwerp voorstelle. Die werk bied die metode aan van gedeeltelike magneet segmentering, wat 'n tegniek is waarvolgens dun insnydings gemaak word aan een of beide kante van die magneet materiaal. Nog ’n metode van gedeeltelike rotor segmentering word beskou waar die insnydings in in ’n gedeelte aan die magneetkant van die soliede rotor juk gemaak word. Hierdie metodes poog om die vloei van werwelstrome te onderbreek en die weerstand soos "gesien" deur die werwelstrome te verhoog, terwyl konstruksie kompleksiteit en koste tot ’n minimum beperk word. Die metodes word bevestig deur eindige element berekeninge wat met gemete resultate vergelyk word. Die gevolg is dat gedeeltelike magneet segmentering 'n baie nuttige, doeltreffende en praktiese metode van die segmentering van magnete is. Die verliesverminderingsprofiel van gedeeltelike segmentering kan soortgelyk wees aan dit van tradisionele volle segmentering. Die metode van gedeeltelike rotor segmentering toon ook 'n groot afname in rotor drywingsverlies. Met die implementering van hierdie metodes op ’n toetsmasjien, kan ’n mens ’n verhoging in benuttingsgraad verwag van meer as 4 %
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Masoud, Mahmoud Ibrahim. "Decoupled control of rotor torque and rotor electric power in a salient pole, synchronous machine." Thesis, Heriot-Watt University, 2003. http://hdl.handle.net/10399/389.

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Drennan, Duncan Scott. "Design of a passive rotor transverse flux rotating machine." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50313.

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Pages 6-12 missing.<br>Thesis (MScEng)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: The transverse flux machine (TFM) offers the opportunity of high torque to volume ratios which makes it an excellent candidate for direct wheel drives and low speed generator applications. TFMs have a three dimensional flux path which eliminates iron laminates as a viable core material. Soft magnetic composites have been adopted in these machines due to their isotropic nature. There are three main variants of TFMs, namely, active rotor (with magnets on the rotor), passive rotor (with magnets on the stator), and reluctance (with no magnets). As a relatively recent development in electrical machines, the TFM still has many hurdles facing its adoption in industry. Some of these hurdles are high cogging torque, a difficult construction, and expensive materials. This thesis focuses on the design of a three phase 50 kW passive rotor machine. Finite element simulation is used to determine the optimal configuration, and the final machine is analysed in detail. The construction process and associated problems are also detailed. The completed machine did not perform to the desired specification, but much knowledge was gleaned about the TFM, the construction caveats, and future potential directions.<br>AFRIKAANSE OPSOMMING: Die transversale-vloed masjien (TFM) met sy hoe draaimoment tot volume verhouding, is 'n uitstekende kandidaat vir direkte wiel aandrywing en lae spoed generator toepassings. Die vioed pad van die masjiene is drie-dimensioneel, wat yster laminasies as kern materiaal elimineer. "Soft magnetic composites" kan gebruik word vir hierdie masjiene as gevolg van hulle isotropiese eienskappe. Daar bestaan drie hoof variante van die TFM, naamlik, die aktiewe rotor (met magnete op die rotor), passiewe rotor (met magnete op to stator), en reluktansie (sonder magnete). Die TFM is 'n redelike nuwe tipe masjien en daar is nog probleme wat opgelos moet word voordat die industrie sal begin om dit te gebruik. Van hierdie probleme is "cogging" draaimoment, 'n moeilike konstruksie en duur materiale. Die fokus van hierie tesis is op die ontwerp van 'n 50 kW drie-fase passiewe rotor masjien. Eindige element simulasie is gebruik om die optimale konfigurasie te kry, en 'n analise is gedoen op die finale masjien. Die konstruksie proses en die probleme wat daarmeer saam gaan is ook beskryf. Die prototipe masjien wat gebou is het nie aan sy oorspronklike spesifikasie voldoen nie, maar baie kennis is opgedoen oor die TFM, die konstruksie proses, en potensiele toekomende toepassings.
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Al-Amer, Itihad Abd Al-Hameed Abd. "A stable doubly-fed machine with novel rotor design." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335349.

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8

Papini, Luca. "Performance calculation of high speed solid rotor induction machine." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52180/.

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Solid rotor induction machines are suitable for applications which require robustness, reliability and high rotational speed. A literature review of high speed technologies is initially presented. The current limitation and challenges are detailed based on a wide collection of data. The multi-physics aspect related with electrical machines for high speed applications are discussed providing a summary of the current state of the art. The main aim of the research was to develop a multi-physic computational environment for the design and analysis of solid rotor induction machines. The electromagnetic, thermal, structural and rotor dynamics models have been developed targeting reduced computational time and accurate predictions. Numerical techniques are proposed based on the discretisation of the computational domain. The different disciplines are linked together providing a flexible and powerful tool for the characterisation of solid rotor induction machine. Another objective was to investigate the impact of the rotor material on the electromagnetic performances of the machine. Finite Element simulation are used to account for the non linear magnetic properties. The impact on the equivalent circuit parameter is discussed and general criteria for material selection presented. Three dimensional finite element calculation are p erformed targeting the validation of the end region correction factor and select the rotor length. The performances of a 120 [kW]−25000 [rpm] solid rotor machine are compared with a caged rotor induction machine for waste heat recovery application.
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Delport, Jacques. "Synchronized Measurement of Machine Rotor Angle and Its Application." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51242.

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The internal voltage angle of a generator is an important parameter that indicates the stability, both transient and steady-state, of the generator. This paper proposes a method of measuring and synchronizing the internal angle using a microprocessor and an optical encoder installed on the shaft of a generator. With a synchronized angle measurement, accurate stability studies and wide-area controls can be implemented. The experimental setup for measuring the rotor angle of a generator is explained in this work. A wide-area power system stabilizer implementing the synchronized angle measurement is then investigated using a four machine, two-area system. A synchronized remote feedback rotor angle signal is included in a traditional stabilizer design. It is shown that this remote signal helps increase the stability of the system while also having the benefit of being able to be predicted accurately. This capability makes bad data detection and communication delay compensation possible.<br>Master of Science
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Wang, Hong. "MACHINE HEALTH MONITORING OF ROTOR-BEARING-GEAR TRANSMISSION SYSTEM." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133281063.

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Books on the topic "Machine rotor"

1

Huppunen, Jussi. High-speed solid-rotor induction machine: Electromagnetic calculation and design. Lappeenranta University of Technology, 2004.

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Dimarogonas, Andrew D. Analytical Methods in Rotor Dynamics: Second Edition. Springer Netherlands, 2013.

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Nguyen-Schäfer, Hung. Rotordynamics of Automotive Turbochargers: Linear and Nonlinear Rotordynamics – Bearing Design – Rotor Balancing. Springer Berlin Heidelberg, 2012.

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Anghel, Cristian. Sensorless flux vector control for a permanent magnet synchronous machine with cylindrical rotor under severe starting conditions. National Library of Canada, 1997.

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Elhawary, Prof Dr Eng Ibrahim Abdou. Mechanics of Rotor Spinning Machines. Edited by Ibrahim A. Elhawary. CRC Press, 2017. http://dx.doi.org/10.1201/9781315371122.

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Lees, A. W. Machine vibration signature analysis. Research Studies Press, 2002.

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Krämer, Erwin. Dynamics of Rotors and Foundations. Springer Berlin Heidelberg, 1993.

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Kenny, Barbara H. Stator and rotor flux based deadbeat direct torque control of induction machines. National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Rieger, N. F. Balancing of rigid and flexible rotors. Shock and Vibration Information Center, U.S. Dept. of Defense, 1986.

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Artemʹev, B. A. Obobshchennai͡a︡ teorii͡a︡ ėlektricheskoĭ mashiny so sploshnym rotorom. Izd-vo Leningradskogo universiteta, 1985.

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Book chapters on the topic "Machine rotor"

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Anderson, Ross. "A modern rotor machine." In Fast Software Encryption. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-58108-1_6.

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Rao, J. S. "Rotor Dynamics Methods." In History of Mechanism and Machine Science. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1165-5_14.

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Georghiou, Luke, J. Stanley Metcalfe, Michael Gibbons, Tim Ray, and Janet Evans. "Renold Power Transmission (Holroyd Machine Tools & Rotors): Rotor Milling Machines." In Post-Innovation Performance. Palgrave Macmillan UK, 1986. http://dx.doi.org/10.1007/978-1-349-07455-6_32.

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Mokhtar, Md Asjad, Ashish K. Darpe, and K. Gupta. "Experimental Investigations on Torsional Vibrations of a Rotor During a Rotor-Stator Rub." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99270-9_39.

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Gupta, K. "Composite Shaft Rotor Dynamics: An Overview." In Mechanisms and Machine Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09918-7_6.

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Chouksey, Manoj, Jayanta K. Dutt, and Subodh V. Modak. "Multi Speed Model Updating of Rotor Systems." In Mechanisms and Machine Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09918-7_63.

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Rao, J. S. "Finite Element Methods for Rotor Dynamics." In History of Mechanism and Machine Science. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1165-5_16.

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Varanis, Marcus, Arthur Mereles, Anderson Silva, José Manoel Balthazar, and Ângelo Marcelo Tusset. "Rubbing Effect Analysis in a Continuous Rotor Model." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99270-9_28.

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Balaji, Nidish Narayanaa, and I. R. Praveen Krishna. "Coupled Simulation of Rotor Systems Supported by Journal Bearings." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_30.

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Sumida, Ivana Yoshie, Haroldo Fraga de Campos Velho, and Thiago Gamboa Ritto. "Bred Vector for Analysis of Helicopter Main Rotor Dynamics." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99268-6_33.

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Conference papers on the topic "Machine rotor"

1

Lawson, Victoria, Meagan Phister, and Clara Rogers. "Automated Rotor Assembly CNC Machine." In 2020 Systems and Information Engineering Design Symposium (SIEDS). IEEE, 2020. http://dx.doi.org/10.1109/sieds49339.2020.9106641.

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Papini, Luca, and Chris Gerada. "Sensitivity analysis of rotor parameters in solid rotor induction machine." In 2017 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2017. http://dx.doi.org/10.1109/iemdc.2017.8002345.

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Gladyshev, Sergey P., Pavel S. Gladyshev, and Irina S. Okrainskaya. "Simulating Synchronous Machine with Wireless Rotor." In 2021 International Conference on Electrical, Computer and Energy Technologies (ICECET). IEEE, 2021. http://dx.doi.org/10.1109/icecet52533.2021.9698480.

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Vilchis-Rodriguez, Damian S., Sinisa Djurović, and Alexander C. Smith. "Sensitivity Assessment of Wound Rotor Induction Generator Bearing Fault Detection Using Machine Electrical Quantities." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94586.

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This paper investigates the sensitivity of machine electrical quantities when employed as a means of bearing fault detection in wound rotor induction generators. Bearing failure is the most common failure mode in rotating AC machinery. With the widespread use of wound rotor induction machines in modern wind power generation, achieving effective detection of bearing faults in these machines is becoming increasingly important in order to minimize wind turbine maintenance related downtime. Current signature analysis has been demonstrated to be an effective technique for achieving detection of different fault types in ac machines. However, this technique lacks sensitivity when used for detection of bearing failures and therefore sophisticated post processing techniques have recently been suggested to improve its performance. As an alternative, this paper investigates the sensitivity of a range of machine electrical quantities to bearing faults, with the aim of examining the possibility of achieving improved bearing fault detection based on identifying a clear fault spectral signature. The reported signatures can be subjected potentially to refined processing techniques to further improve fault detection.
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Gritli, Y., A. Tani, C. Rossi, D. Casadei, and F. Filippetti. "Accurate rotor fault detection in doubly-fed Wound-Rotor Induction Machine." In 2017 6th International Conference on Clean Electrical Power (ICCEP). IEEE, 2017. http://dx.doi.org/10.1109/iccep.2017.8004776.

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McElhinney, S. A., T. M. Jahns, and T. A. Shedd. "Centrifugally Pumped Thermosiphons for Motor Rotor Cooling." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48516.

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This paper presents a detailed approach to provide improved cooling and heat spreading in electric machine rotors using centrifugally-pumped revolving thermosiphons. Design concepts are discussed that offer the following advantages: (1) high thermal performance across a wide range of operating points; (2) low-impedance heat paths; (3) excellent opportunities for integration with electric machine design for improved electromagnetic performance and structural design, as well as practical, cost-effective manufacturing. It takes advantage of centrifugal force to provide effective inertial pumping over a wide range of operating conditions. In addition, the new thermosiphon design is compatible with existing standard electric machine manufacturing techniques and cooling needs. A condenser section fin and ramp structure provides consistently high condensation performance. Surface texture design to promote effective nucleate boiling at high speeds is discussed, and fluid fill factor is analyzed. Applications include induction and PM synchronous machines. Benefits of these thermosiphons include increased steady-state power and torque density, increased and more consistent efficiency, and reduced permanent magnet volume and cost in PM synchronous machines. Other applications may include centrifugal gas compression, chemical processes, and machine tools.
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Li, Q., and T. Fan. "Torque Improvement of External-Rotor Permanent Magnet Machine Using Flux Concentrated Rotor." In 2018 IEEE International Magnetic Conference (INTERMAG). IEEE, 2018. http://dx.doi.org/10.1109/intmag.2018.8508125.

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Knight, Andrew M., Robert E. Betz, William K. Song, and David G. Dorrell. "Brushless doubly-fed reluctance machine rotor design." In 2012 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2012. http://dx.doi.org/10.1109/ecce.2012.6342466.

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Gladyshev, S. P., P. S. Gladyshev, and I. S. Okrainskaya. "Simulation Direct Current Machine with Wireless Rotor." In 2019 IEEE International Conference on Electro Information Technology (EIT). IEEE, 2019. http://dx.doi.org/10.1109/eit.2019.8833713.

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Makni, Zaatar, and Wided Zine. "Rotor position estimator based on machine learning." In IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2016. http://dx.doi.org/10.1109/iecon.2016.7793911.

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Reports on the topic "Machine rotor"

1

Brown, Ian, and Daniel Ludois. Wound Field and Hybrid Synchronous Machines for EV Traction with Brushless Capacitive Rotor Field Excitation (Final Report). Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1837809.

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McKeever, John W. Enclosure Requirements to Protect Personnel from Spinning Rotor Frailures at the Power Electronics and Electric Machinery Research Center. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/932617.

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