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Journal articles on the topic 'Rotor and stator losses'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Etemad, M. R., K. Pullen, C. B. Besant, and N. Baines. "Evaluation of Windage Losses for High-Speed Disc Machinery." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 206, no. 3 (1992): 149–57. http://dx.doi.org/10.1243/pime_proc_1992_206_025_02.

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Design and development of experimental apparatus is detailed for stator drag torque measurement as well as a method to evaluate rotor windage losses directly from air mass flow and temperature changes. Effects of air jets at the rotor rim were also investigated. Results are presented for air windage losses associated with ultra-high-speed machinery. These show that within the range investigated the air gap length between the rotor and the stator has an insignificant effect on windage losses. The lowest windage losses were encountered when air was forced through the rotor/stator gap from the di

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2

Artt, D. W., and S. W. T. Spence. "A loss analysis based on experimental data for a 99.0 mm radial inflow nozzled turbine with different stator throat areas." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 212, no. 1 (1998): 27–42. http://dx.doi.org/10.1243/0957650981536718.

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The results of experimental performance tests on a 99.0 mm radial inflow turbine with seven different nozzle throat areas were reported by the same authors in a previous publication (1). In order to perform a loss analysis, dividing the turbine losses between the stator and the rotor, a theoretical model of the stator loss was required. Several stator loss models were evaluated and the model described by Rohlik (9) was used as the basis for a loss analysis. Plots are given for the breakdown of losses at two operating speeds for each nozzle size. Both the stator and the rotor losses decreased m

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3

Brkovic, Bogdan, and Milos Jecmenica. "Calculation of Rotor Harmonic Losses in Multiphase Induction Machines." Machines 10, no. 5 (2022): 401. http://dx.doi.org/10.3390/machines10050401.

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The topic of this paper is the determination of rotor harmonic losses in multiphase machines. Specifically, harmonic losses occur in the rotor winding and core due to higher-order spatial harmonics of the flux density. This phenomenon influences machine parameters and overall performance and increases temperature rise in parts of the rotor. The flux density distribution is determined by the stator magnetomotive force harmonic content, which is directly related to the winding distribution. A cage-rotor asymmetrical six-phase induction machine is selected for this case study. An analysis of diff

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4

Sirimanna, Samith, Thanatheepan Balachandran, and Kiruba Haran. "A Review on Magnet Loss Analysis, Validation, Design Considerations, and Reduction Strategies in Permanent Magnet Synchronous Motors." Energies 15, no. 17 (2022): 6116. http://dx.doi.org/10.3390/en15176116.

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Eddy current losses in magnets are a major consideration in the rotor design of permanent magnet synchronous motors (PMSMs). Stator design choices and the use of modern inverters with high switching frequency introduce harmonics that can contribute to significant losses in the magnets, causing the rotor to heat up. In typical PMSMs, the lack of rotor cooling can cause the magnet’s performance to degrade at high temperatures and eventually demagnetize. This review examines a large number of studies analyzing magnet eddy current losses using analytical methods and finite-element analysis. In som

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5

Kostic, Miloje. "Calculation improvement of no-load stray losses in induction motors with experimental validation." Serbian Journal of Electrical Engineering 12, no. 3 (2015): 303–20. http://dx.doi.org/10.2298/sjee1503303k.

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On the basis of the known fact that all air gap main flux density variations are enclosed by permeance slot harmonics, only one component of stray losses in rotor (stator) iron is considered in the new classification, instead of 2 components: rotor (stator) pulsation iron losses, and rotor (stator) surface iron losses. No-load rotor cage (high-frequency) stray losses are usually calculated. No-load stray losses are caused by the existence of space harmonics: the air-gap slot permeance harmonics and the harmonics produced by no-load MMF harmonics. The second result is the proof that the corresp

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6

Huang, Yi, and Clemens Gühmann. "Wireless Sensor Network for Temperatures Estimation in an Asynchronous Machine Using a Kalman Filter." ACTA IMEKO 7, no. 1 (2018): 5. http://dx.doi.org/10.21014/acta_imeko.v7i1.509.

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<p class="Abstract">A 4<sup>th</sup>-order Kalman filter (KF) algorithm is developed based on the thermal model of an asynchronous machine. The thermal parameters are identified and KF is implemented in a wireless sensor network (WSN) to estimate the temperatures of the stator windings, the rotor cage, and the stator core of an asynchronous machine. The rotor speed, coolant air temperature, and the effective current and voltage are acquired by a WTIM (wireless transducer interface module) separately and transmitted to a NCAP (network capable application processor) where the K

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7

Liu, Nai-Wen, Kuo-Yuan Hung, Shih-Chin Yang, Feng-Chi Lee, and Chia-Jung Liu. "Design of High-Speed Permanent Magnet Motor Considering Rotor Radial Force and Motor Losses." Energies 13, no. 22 (2020): 5872. http://dx.doi.org/10.3390/en13225872.

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Different from the design of conventional permanent magnet (PM) motors, high-speed motors are primarily limited by rotor unbalanced radial forces, rotor power losses, and rotor mechanical strength. This paper aimed to propose a suitable PM motor with consideration of these design issues. First, the rotor radial force is minimized based on the selection of stator tooth numbers and windings. By designing a stator with even slots, the rotor radial force can be canceled, leading to better rotor strength at high speed. Second, rotor power losses proportional to rotor frequency are increased as moto

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8

Walker, G. J., J. D. Hughes, I. Ko¨hler, and W. J. Solomon. "The Influence of Wake–Wake Interactions on Loss Fluctuations of a Downstream Axial Compressor Blade Row." Journal of Turbomachinery 120, no. 4 (1998): 695–704. http://dx.doi.org/10.1115/1.2841780.

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The interaction between wakes of an adjacent rotor–stator or stator–rotor blade row pair in an axial turbomachine is known to produce regular spatial variations in both the time-mean and unsteady flow fields in a frame relative to the upstream member of the pair. This paper examines the influence of such changes in the free-stream disturbance field on the viscous losses of a following blade row. Hot-wire measurements are carried out downstream of the outlet stator in a 1.5-stage axial compressor having equal blade numbers in the inlet guide vane (IGV) and stator rows. Clocking of the IGV row i

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9

Awah, C. C., O. I. Okoro,, A. J. Onah, and G. C. Diyoke. "Estimation of losses and efficiency of double-stator switched flux permanent magnet machines." Nigerian Journal of Technological Development 19, no. 2 (2022): 150–55. http://dx.doi.org/10.4314/njtd.v19i2.7.

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Losses such as rotor iron and stator iron losses, magnet eddy current loss, as well as efficiency of a double stator permanent magnet machine having varying rotor pole numbers is estimated and presented in this study. This current investigation would be vital for electrical machine designers in quantifying the amount of losses in the various sections of a given double stator electric machine and as well provide better insight on resulting output efficiency of the machine. Time-stepping finite element analysis (TS-FEA) procedure is adopted in the calculations using ANSYS-MAXWELL simulation soft

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10

Spence, S. W. T., R. S. E. Rosborough, D. Artt, and G. McCullough. "A Direct Performance Comparison of Vaned and Vaneless Stators for Radial Turbines." Journal of Turbomachinery 129, no. 1 (2006): 53–61. http://dx.doi.org/10.1115/1.2218518.

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An extensive performance investigation has been conducted on a radial turbine with three different vaneless volutes and three corresponding vaned stators. Previously published comparisons have been based on turbines with unmatched flow rates, meaning that the impact of stator losses was not isolated from rotor and exit losses. Each vaned stator configuration tested in this investigation matched the flow rate of the corresponding vaneless volute to within 1%. The volutes and the vaned stators were all machined in order to achieve high quality and comparable surface finishes. At all operating co

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11

Yin, Zengyuan, Yuanwen Cai, Weijie Wang, and Yuan Ren. "Analysis and Experiment of Eddy Current Loss in Radial Magnetic Bearings with Solid Rotor." MATEC Web of Conferences 198 (2018): 04002. http://dx.doi.org/10.1051/matecconf/201819804002.

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In order to reduce power losses for the aerospace applications, this paper analyzes the eddy current losses produced by high-speed rotating solid rotor core magnetic bearings of magnetically suspended control & sensitive gyroscope (MSCSG). An analytical model of the eddy current loss of a solid rotor radial magnetic bearing (RMB) is presented. Considering the difference between NNNN and NSNS magnetic circuits of RMB, the magnetic field expressions of stator magnetic poles are listed. The magnetic field of stator poles is replaced by Fourier series expansion. According to the magnetic field

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12

Meshcheryakov, V. N., and O. V. Kryukov. "FREQUENCY-PARAMETRIC CONTROL SYSTEM OF AN ASYNCHRONOUS ELECTRIC DRIVE WITH AN OBSERVER OF THE ANGLE BETWEEN THE VECTORS OF THE STATOR CURRENT AND THE MAGNETIZATION CURRENT." Kontrol'. Diagnostika, no. 286 (April 2022): 34–39. http://dx.doi.org/10.14489/td.2022.04.pp.034-039.

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In industry, especially metallurgy, a large number of previously installed electric drives based on an asynchronous motor with a phase rotor with uneconomical parametric control systems are used, the advantage of which is the possibility of removing part of the sliding energy from the rotor circuit, and the ability to obtain an increased inrush current multiplicity. The use of frequency converters in such an electric drive allows you to adjust the speed of rotation of the stator field and maintain sliding and losses in the rotor circuit at a minimum level. However, when the rotor windings are

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13

Ur Rahman, Lutf, Faisal Khan, Muhammad Afzal Khan, et al. "Modular Rotor Single Phase Field Excited Flux Switching Machine with Non-Overlapped Windings." Energies 12, no. 8 (2019): 1576. http://dx.doi.org/10.3390/en12081576.

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This paper aims to propose and compare three new structures of single-phase field excited flux switching machine for pedestal fan application. Conventional six-slot/three-pole salient rotor design has better performance in terms of torque, whilst also having a higher back-EMF and unbalanced electromagnetic forces. Due to the alignment position of the rotor pole with stator teeth, the salient rotor design could not generate torque (called dead zone torque). A new structure having sub-part rotor design has the capability to eliminate dead zone torque. Both the conventional eight-slot/four-pole s

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14

Haisen, Zhao, Liu Xiaofang, Cui Xueshen, and Luo Yingli. "Time-stepping finite element analysis on the influence of rotational flux on local core losses of AC electrical machines." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 1/2 (2013): 126–36. http://dx.doi.org/10.1108/compel-10-2012-0253.

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Purpose – The purpose of the paper is to study the influence of rotational flux on local core losses of the motors, which is difficult to distinguish the iron losses caused by rotational flux in certain electric machines through experiment. Therefore, time-stepping finite element method (T-S FEM) is used to consider the rotational flux and to predict the local core losses. Design/methodology/approach – Time-stepping finite element method. Findings – It is found that, in stator side, rotational flux mainly exists in tooth root and yoke area near the bottom of stator slot, those area is about 45

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15

Awah, Chukwuemeka Chijioke, and Ogbonnaya Inya Okoro. "Torque characteristics of double-stator permanent magnet synchronous machines." Archives of Electrical Engineering 66, no. 4 (2017): 815–28. http://dx.doi.org/10.1515/aee-2017-0062.

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Abstract The torque profile of a double-stator permanent magnet (PM) synchronous machine of 90 mm stator diameter having different rotor pole numbers as well as dual excitation is investigated in this paper. The analysis includes a comparative study of the machine’s torque and power-speed curves, static torque and inductance characteristics, losses and unbalanced magnetic force. The most promising flux-weakening potential is revealed in 13- and 7-rotor pole machines. Moreover, the machines having different rotor/stator (Nr/Ns) pole combinations of the form Nr = Ns ± 1 have balanced and symmetr

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16

Kruchinina, Irina Yu, Yuvenaliy Khozikov, Alexandr Liubimtsev, and Valentina Paltceva. "Harmonic losses in high-speed PM synchronous machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 3 (2017): 683–91. http://dx.doi.org/10.1108/compel-09-2016-0401.

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Purpose The purpose of this paper is the development of a new numerical method for the calculation of the air-gap magnetic flux harmonics in synchronous machines with permanent magnet (PM) excitation. The harmonic analysis results are used as input data for the eddy-current loss calculation and for the rotor heating evaluation. Design/methodology/approach The method is based on the finite element analysis (FEA). The model takes into account toothed stator design, rotor asymmetrical magnetic reluctance and saturation. At first, a series of static DC magnetic (magnetostatic) simulations is run.

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17

Howard, M. A., P. C. Ivey, J. P. Barton, and K. F. Young. "Endwall Effects at Two Tip Clearances in a Multistage Axial Flow Compressor With Controlled Diffusion Blading." Journal of Turbomachinery 116, no. 4 (1994): 635–45. http://dx.doi.org/10.1115/1.2929454.

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Effects of tip clearance, secondary flow, skew, and corner stall on the performance of a multistage compressor with controlled diffusion blading have been studied experimentally. Measurements between 1 and 99 percent annulus height were carried out in both the first and the third stages of a four-stage low-speed compressor with repeating-stage blading. Measurements were obtained at a datum rotor tip clearance and at a more aerodynamically desirable lower clearance. The consequences of the modified rotor tip clearance on both rotor and stator performance are examined in terms of loss coefficien

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18

Renuke, Avinash, Alberto Traverso, and Matteo Pascenti. "Performance Assessment of Bladeless Micro-Expanders Using 3D Numerical Simulation." E3S Web of Conferences 113 (2019): 03016. http://dx.doi.org/10.1051/e3sconf/201911303016.

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This paper summarizes the development of fully 3D Computational Fluid Dynamics (CFD) analysis for bladeless air micro expander for 200 W and 3 kW rated power. Modelling of nozzle along with rotor is done using structured mesh. This analysis, for the first time, demonstrates the interaction between nozzle and rotor using compressible flow density-based solver. The Shear Stress Transport (SST) turbulence model is employed to resolve wall effects on the rotor and to determine the shear stress accurately. The results illustrate the flow field inside stator and rotor along with complicated mixing z

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19

Yang, Guohui, Chengning Zhang, and Shuo Zhang. "A novel method to predict the influence of rotor structures on the core loss of permanent magnet synchronous machines." International Journal of Applied Electromagnetics and Mechanics 66, no. 2 (2021): 283–95. http://dx.doi.org/10.3233/jae-201569.

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Permanent magnet synchronous machines (PMSMs) are widely used owing to high power density, high efficiency, etc. Core losses account for a significant component of the total loss in PMSMs beside winding losses. Therefore, it is necessary to consider core losses when designing PMSMs according to actual research applications. In this paper, taking four typical rotor structures (surface-mounted, embedded, “—” shape, “V” shape) as examples, an analysis method is proposed to predict the influence of different rotor structures on core loss of PMSMs. In the case of the same stator and winding structu

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20

Stephen Ejiofor, Oti, Ugwu Justin, Nnadi Damian Benneth, and Ogbuefi Uche. "Development and thermal modeling of an induction machine." International Journal of Engineering & Technology 8, no. 4 (2019): 500. http://dx.doi.org/10.14419/ijet.v8i4.29727.

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In induction machines, the major concern is the temperature rise since it determines the maximum loading, in an attempt to avoid insula-tion deterioration and eventual loss of motor life. The effect of excessive heat in the motor stator and rotor windings and the stator mag-netic circuit can degrade the developed performance of the machine and also affect the motor loading and life span if not dispensed properly. This research work examines the thermal model for estimating the stator and rotor temperatures in cage induction motor. A state-variable model of the induction is used. The twin-axis

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21

Попадюк, Ігор, Іван Матлай, Вадим Орел та Богдан Піцишин. "ВПЛИВ ЕКСЦЕНТРИСИТЕТУ ЦИЛІНДРИЧНОГО РОТОРА ВІДНОСНО СТАТОРА НА ГІДРАВЛІЧНИЙ ОПІР У ВОДНИХ РОЗЧИНАХ ДИТАЛАНУ". European Science, sge10-02 (30 квітня 2019): 154–61. http://dx.doi.org/10.30890/2709-2313.2022-10-02-002.

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22

Allaire, P. E., M. E. F. Kasarda, and L. K. Fujita. "Rotor Power Losses in Planar Radial Magnetic Bearings—Effects of Number of Stator Poles, Air Gap Thickness, and Magnetic Flux Density." Journal of Engineering for Gas Turbines and Power 121, no. 4 (1999): 691–96. http://dx.doi.org/10.1115/1.2818528.

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Rotor Power losses in magnetic bearings cannot be accurately calculated at this time because of the complexity of the magnetic field distribution and several other effects. The losses are due to eddy currents, hysteresis, and windage. This paper presents measured results in radial magnetic bearing configurations with eight pole and 16 pole stators and two laminated rotors. Two different air gaps were tested. The rotor power losses were determined by measuring the rundown speed of the rotor after the rotor was spun up to speeds of approximately 30,000 rpm, DN = 2,670,000 mm-rpm, in atmospheric

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23

DEKHANDJI, Fatma Zohra, and Hamid BENTARZI. "Theoretical and Experimental Investigation of the Supply Voltage Unbalance Effects on Squirrel Cage Induction Motors." Algerian Journal of Signals and Systems 4, no. 2 (2019): 51–60. http://dx.doi.org/10.51485/ajss.v4i2.82.

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Voltage unbalance is one of the power quality problems causing a lot of ill effects on induction motors. These are namely: Overheating, line-current unbalance, derating, torque pulsation, and inefficiency. The objective of the present work is to assess and quantify the effects of voltage unbalance on induction motors using both theory and experimentation. The analytical study is performed using the complex voltage unbalance factor model of this problem. The work deals specifically with the influence of the variations in the complex angle of the voltage unbalance factor on the stator and rotor

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24

Yang, Zhiyu, Xiaoyong Sun, Ruizhao Han, Ruyu Shang, Zhen Chen, and Xiangdong Liu. "Influence of Winding Configurations and Stator/Rotor Pole Combinations on Field Back-EMF Ripple in Switched Flux Hybrid Excited Machines." Energies 17, no. 23 (2024): 5906. http://dx.doi.org/10.3390/en17235906.

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Similar to armature back electromotive force (armature back-EMF), the back-EMF also exists in the field winding of hybrid excited machines. However, the existence of field back electromotive force (field back-EMF) is harmful to the safe and stable operation of machine systems, e.g., higher losses, lower efficiency, higher torque ripple, and reduced control performance. This paper systematically investigates the influence of armature/field winding configurations together with stator/rotor pole combinations on the field back-EMF ripple in hybrid excited machines with switched-flux stators. The t

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SCHIEBER, D., and L. SCHACHTER. "ELECTRODYNAMICS OF SOLID ROTOR INDUCTION MACHINE WITH STATOR LOSSES." Electric Machines & Power Systems 12, no. 1 (1987): 13–25. http://dx.doi.org/10.1080/07313568708960092.

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26

Yang, Changzhu, Liyun Fan, Zhuhai Zhong, and Hanwen Zhang. "Numerical and Experimental Investigation on Flow Field of the Turbine Stage under Different Axial Gaps." Processes 11, no. 7 (2023): 2138. http://dx.doi.org/10.3390/pr11072138.

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In order to reduce efficiency losses and improve the aerodynamic efficiency of axial turbines used in industry, the flow fields of the turbine stage were investigated numerically and experimentally under different axial gaps in this work. The influence of the axial gaps on the flow unsteadiness and the flow field distribution is discussed. The results show that the aerodynamic efficiency of the turbine stage increases when the axial distance is reduced. The difference in entropy increases under different axial distances are mainly found in the section from the stator inlet to the rotor inlet:

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Leidhold, R., D. Kaluhin, and O. Tolochko. "EXPERIMENTAL RESEARCH OF THE MAGNETIZATION AND DEMAGNETIZATION PROCESSES OF THE VECTOR-CONTROLLED INDUCTION MOTOR." Tekhnichna Elektrodynamika 2024, no. 6 (2024): 44–49. http://dx.doi.org/10.15407/techned2024.06.044.

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Experimental research of the processes of magnetization and demagnetization for the motionless vector-controlled induction motor was performed, according to a linear law with a variation in the duration of these processes. The methodology of research during which the orthogonal components of the stator and rotor currents were recorded in the rotor flux reference frame, the rotor flux module and the energy of the total losses in the stator and rotor copper is described. The main characteristics and parameters of laboratory equipment and facilities are given. From the point of view of minimizing

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28

Binder, A., W. Fo¨rster, H. Kruse, and H. Rogge. "An Experimental Investigation Into the Effect of Wakes on the Unsteady Turbine Rotor Flow." Journal of Engineering for Gas Turbines and Power 107, no. 2 (1985): 458–65. http://dx.doi.org/10.1115/1.3239749.

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Detailed measurements were carried out near and within a turbine rotor using the Laser-2-Focus velocimeter. Testing was performed in a single stage cold air turbine at off-design conditions with a stator outlet Mach number of approximately 0.8. Instantaneous and averaged results of the velocity, the yaw angle, and the turbulence intensity provided information on the rotor flow field. This report describes the periodical and random unsteady effects of the stator wakes impinging on the rotor blades. In particular the constant unsteadiness contours clearly disclose the development of the wakes cu

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Yang, Liu, Jing Zhao, Wenqi Fu, Xiangdong Liu, Jianguo Zhu, and Chao Ai. "A Comprehensive Investigation of Winding Eddy and Circulating Current Losses of Stator Iron Coreless PMBLDC Motors." Energies 16, no. 14 (2023): 5523. http://dx.doi.org/10.3390/en16145523.

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A method is proposed to comprehensively study the eddy and circulating current losses of stator winding wound by multiple parallel strands, to further improve the power density of stator iron coreless permanent magnet brushless DC (PMBLDC) motors. Analytical models of the eddy and circulating current losses in stator winding are deduced firstly to explicitly express the influencing factors of these two losses. As is shown, these factors are mutually contradicting. While the eddy current loss can be greatly reduced by using multiple parallel conductor strands, the circulating current loss will

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Kartal, Emin Tarik, and Fatma Keskin Arabul. "PERFORMANCE COMPARISON OF WINDING TYPES AND ROTOR STRUCTURE IN SYNCHRONOUS RELUCTANCE MOTOR." Mühendislik Bilimleri ve Tasarım Dergisi 12, no. 4 (2024): 835–47. https://doi.org/10.21923/jesd.1558750.

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Synchronous Reluctance Motors (SynRMs) have attracted a lot of attention in recent years due to their simple construction, high efficiency and the fact that they do not require rare earth magnets. SynRMs produce torque by directing the magnetic flux through barriers in the rotor, making them a low-cost alternative. The performance of the motor can vary significantly depending on the design of the stator windings and rotor barriers. Different combinations of stator winding types and the number of rotor barriers directly affect the critical performance parameters of the motor such as torque, eff

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Nasir, Bilal Abdullah. "Dynamic Modeling of Wound-Rotor Slip-Ring Induction Generator with Switched-Excitation Capacitance and Chopper Resistance Across Bridge Rectifier in the Rotor Circuit." European Journal of Electrical Engineering 24, no. 1 (2022): 27–32. http://dx.doi.org/10.18280/ejee.240104.

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This paper presents a novel external secondary self-excitation capacitance and chopper resistance across the diode bridge rectifier in the rotor circuit to control the voltage and frequency of 3-phase, wound-rotor, slip-ring, induction generator (WRSRIG). The problem related to the excitation- capacitance from the rotor side is the required large excitation capacitance to enhance the generator performance in a wide - range. In the present proposed method, a dynamic excitation capacitance is used in the H-Bridge inverter circuit connected in series with a chopper resistance across a 3-phase dio

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32

Kasarda, M. E. F., P. E. Allaire, E. H. Maslen, G. R. Brown, and G. T. Gillies. "High-Speed Rotor Losses in a Radial Eight-Pole Magnetic Bearing: Part 1—Experimental Measurement." Journal of Engineering for Gas Turbines and Power 120, no. 1 (1998): 105–9. http://dx.doi.org/10.1115/1.2818059.

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The continual increase in the use of magnetic bearings in various capacities, including high-speed aerospace applications such as jet engine prototypes, dictates the need to quantify power losses in this type of bearing. The goal of this study is to present experimentally measured power losses during the high-speed operation of a pair of magnetic bearings. A large-scale test rotor has been designed and built to obtain unambiguous power loss measurements while varying a variety of test parameters. The test apparatus consists of a shaft supported in two radial magnetic bearings and driven by two

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Selvaraj, D. Edison, R. Vijayraj, M. Raj Kumar та ін. "Estimation of Losses on 3Φ Nano Coated Induction Motor". Applied Mechanics and Materials 666 (жовтень 2014): 213–17. http://dx.doi.org/10.4028/www.scientific.net/amm.666.213.

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In this recent decades, there was a significant growth in the applications of nano technology in the field of electrical and electronics engineering. In this research paper, the estimation of the different types of losses on a normal and nano coated three phase induction motor was done and hence the results were compared with each other. From these researches, it found that the mechanical losses were reduced by 33.33% in the motor after nano coating whereas stator iron losses were reduced by 13.8%. Stator losses were reduced up to 16.7% by coating the windings of the motor with the enamel fill

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Zhang, Chi, and Guang Zhou Zhao. "Design and FEM Analysis of a High Efficiency Axial-Flux Brushless DC Motor for Flywheel System." Key Engineering Materials 480-481 (June 2011): 1099–104. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.1099.

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A high efficiency axial-flux brushless DC motor assisted by self axial magnetic bearing and used in flywheel energy storage system is proposed in this paper. In this design, the rotor with composite rim acts as the flywheel of the system and is sandwiched between two disk type stators which are made of amorphous metal to reduce iron losses. The dual-stator machine combines the functions of axial flux brushless DC motor and axial magnetic bearing to rotate the flywheel-rotor and levitate it in vertical orientation. The other four degrees of freedom in radial directions are constrained by cerami

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Lee, Ju-Hyeong, Soyoung Sung, Han-Wook Cho, Jang-Young Choi, and Kyung-Hun Shin. "Investigation of Electromagnetic Losses Considering Current Harmonics in High-Speed Permanent Magnet Synchronous Motor." Energies 15, no. 23 (2022): 9213. http://dx.doi.org/10.3390/en15239213.

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This paper presents a characteristic analysis and experimental verification for predicting the electromagnetic losses in high-speed permanent magnet synchronous motors. To predict the operating characteristics (such as speed and input current), dynamic modeling is conducted that combines models for the space vector pulse width modulation (SVPWM) inverter and high-speed permanent magnet synchronous motor (HPMSM). By applying the predicted harmonic currents to the electromagnetic analysis, DC and AC copper losses of the stator winding, and eddy current loss of the rotor sleeve and rotor permanen

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Deusinger, Björn, and Andreas Binder. "Evaluation of a newly proposed indirect efficiency determination method for permanent magnet synchronous machines." e & i Elektrotechnik und Informationstechnik 139, no. 2 (2022): 155–66. http://dx.doi.org/10.1007/s00502-022-01004-5.

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AbstractThis paper evaluates the applicability of a newly proposed method for the indirect efficiency determination of permanent magnet synchronous machines by measuring individual losses. Similar methods are well-known and standardized for other kinds of electrical machines, but for permanent magnet synchronous machines, only the direct measurement of input and output power is standardized for efficiency determination according to IEC 60034-2‑1. Measurements and finite element simulations are carried out for four selected test machines with a rated power range between 45 kW and 90 kW and with

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Hong, Kyung-Pyo, and Ju Lee. "Design of 200 kW Cryogenic Induction Motor for Liquefied Natural Gas Emergency Pump." Energies 17, no. 8 (2024): 1898. http://dx.doi.org/10.3390/en17081898.

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This paper presents a design study focusing on the thermal safety of an induction motor integrated with a pump unit, which operates submerged in liquefied natural gas (LNG) in the LNG tanks of LNG carrier ships ranging from 150 K to 200 K cubic meters (CBM). In this study, we carried out the electromagnetic design of the induction motor and verified the thermal safety against a temperature increase due to losses during the motor operation through thermal fluid analysis, taking into account the discharge flow of the emergency pump and the air gap of the motor. In the electromagnetic design, the

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Siddiqi, Mudassir Raza, Tanveer Yazdan, Jun-Hyuk Im, Muhammad Humza, and Jin Hur. "Design and Analysis of a Dual Airgap Radial Flux Permanent Magnet Vernier Machine with Yokeless Rotor." Energies 14, no. 8 (2021): 2311. http://dx.doi.org/10.3390/en14082311.

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This paper presents a novel topology of dual airgap radial flux permanent magnet vernier machine (PMVM) in order to obtain a higher torque per magnet volume and similar average torque compared to a conventional PMVM machine. The proposed machine contains two stators and a sandwiched yokeless rotor. The yokeless rotor helps to reduce the magnet volume by providing an effective flux linkage in the stator windings. This effective flux linkage improved the average torque of the proposed machine. The competitiveness of the proposed vernier machine was validated using 2D finite element analysis unde

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Młot, Adrian, Mariusz Korkosz, and Marian Łukaniszyn. "Iron loss and eddy-current loss analysis in a low-power BLDC motor with magnet segmentation." Archives of Electrical Engineering 61, no. 1 (2012): 33–46. http://dx.doi.org/10.2478/v10171-012-0003-5.

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Iron loss and eddy-current loss analysis in a low-power BLDC motor with magnet segmentation This paper considers a Brushless Direct Current (BLDC) machine prototype with six poles and 36 stator slots including a three phase double-layered distributed winding. Presented modifications of rotor construction are identified in order to achieve the best possible compromise of eddy-current losses and cogging torque characteristics. The permanent magnet (PM) eddy-current loss is relatively low compared with the iron loss; it may cause significant heating of the PMs due to the relatively poor heat diss

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Michelassi, V., F. Martelli, R. De´nos, T. Arts, and C. H. Sieverding. "Unsteady Heat Transfer in Stator–Rotor Interaction by Two-Equation Turbulence Model." Journal of Turbomachinery 121, no. 3 (1999): 436–47. http://dx.doi.org/10.1115/1.2841336.

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A transonic turbine stage is computed by means of an unsteady Navier–Stokes solver. A two-equation turbulence model is coupled to a transition model based on integral parameters and an extra transport equation. The transonic stage is modeled in two dimensions with a variable span height for the rotor row. The analysis of the transonic turbine stage with stator trailing edge coolant ejection is carried out to compute the unsteady pressure and heat transfer distribution on the rotor blade under variable operating conditions. The stator coolant ejection allows the total pressure losses to be redu

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Ostović, Vlado. "Direct drive double fed wind generator." Journal of Physics: Conference Series 2626, no. 1 (2023): 012007. http://dx.doi.org/10.1088/1742-6596/2626/1/012007.

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Abstract An electric machine topology characterized by single tooth winding in both stator and rotor is presented. The proposed machine is capable of operating as a direct drive double fed wind generator (DDDF, D3F), because it requires no gearbox. A wind turbine drive built around a D3F generator is cheaper to manufacture, requires less maintenance and has a higher energy yield than its conventional counterparts. The all tooth wound generator of a D3F turbine has a superb volume utilisation and lower stator I2R losses due to its extremely short end windings, efficient cooling and reduced acti

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Wang, Han, Xiaoze Pei, Boyuan Yin, John Frederick Eastham, Christopher Vagg, and Xianwu Zeng. "A Novel Double-Sided Offset Stator Axial-Flux Permanent Magnet Motor for Electric Vehicles." World Electric Vehicle Journal 13, no. 3 (2022): 52. http://dx.doi.org/10.3390/wevj13030052.

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Axial-flux permanent magnet (AFPM) motors have been attracting great interest due to their key advantages of high-torque density and compact structure. Concentrated windings are commonly used for AFPM motors since they significantly reduce the radial length of the end windings. This paper proposes a novel double-sided stator single-rotor motor topology where one stator is offset by π radians. This arrangement can cancel significant space harmonics produced by the concentrated winding and reduce the core and permanent magnet losses. Analytical analysis and finite element analysis (FEA) are used

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Broichhausen, K. D., H. E. Gallus, and R. Mo¨nig. "Off-Design Performance of Supersonic Compressors With Fixed and Variable Geometry." Journal of Turbomachinery 110, no. 3 (1988): 312–21. http://dx.doi.org/10.1115/1.3262197.

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Regarding the extremely high pressure ratios of jet-engine compressors for the next decade, increasing interest belongs to the further development of supersonic compressors with supersonic relative flow at rotor inlet and supersonic absolute flow at stator inlet. In the past, different suitable design procedures for these components have been developed and tested successfully. However, there is a lack of information concerning the off-design performance of supersonic compressors. The present paper first systematically shows blading and flow path geometry of different experimentally investigate

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Titova, T. S., A. M. Evstaf’ev, and A. A. Pugachev. "Vector control system of electric traction drive with power losses minimization." Journal of Physics: Conference Series 2131, no. 4 (2021): 042090. http://dx.doi.org/10.1088/1742-6596/2131/4/042090.

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Abstract Based on the operating conditions analysis of electric traction drives of locomotives, it has been established that the vector control systems for an asynchronous motor fully satisfy all the requirements. On the basis of a T-shaped equivalent circuit, a mathematical model of an induction motor is presented, taking into account losses in the stator steel, the effect of the rotor current and saturation displacement. An algorithm for the formation of the optimal, from the point of view of power losses, task for the rotor flux linkage when using a vector control system with the orientatio

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Balogun, Adeola, Sodiq Agoro, Sunday Adetona, Ayobami Olajube, and Frank Okafor. "An Efficiency Optimized Direct Model Predictive Control of Induction Machine Drive." Journal of Techniques 6, no. 3 (2024): 76–84. http://dx.doi.org/10.51173/jt.v6i3.2598.

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Presented in this paper is a direct model predictive control (MPC) for directly controlling the rotor speed and flux of an inverter-fed induction motor, which is also applicable to induction generators. Discrete dynamic model of the induction machine is applied in stationary reference frame with pre-set present and past reference values of the speed and rotor flux for generating the stator current references The uniqueness of the MPC proposed herein is that it does not require outer cascade proportional plus integral (PI) controllers used for regulating rotor speed and flux. Elimination of the

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Rathod, Pavan, and K. B. Ramesh. "Induction Motor Parameter Estimation Using Harmony Search Algorithm." Journal of Communication Engineering and its Innovations 8, no. 2 (2022): 13–20. http://dx.doi.org/10.46610/jocei.2022.v08i02.003.

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This study uses the Harmony Search Algorithm to carry out induction motor parameter estimation (HSA). In order to maximize the starting torque and minimize copper losses in the stator and rotor, the parameters rotor resistance R2 and rotor reactance X2 are determined. For parameter estimation of an induction motor, both conventional and intelligent methods are being examined. It is then subjected to the harmony search algorithm to obtain maximum beginning torque and efficiency, respectively.

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Giovannini, Matteo, Filippo Rubechini, Michele Marconcini, Andrea Arnone, and Francesco Bertini. "Reducing Secondary Flow Losses in Low-Pressure Turbines: The “Snaked” Blade." International Journal of Turbomachinery, Propulsion and Power 4, no. 3 (2019): 28. http://dx.doi.org/10.3390/ijtpp4030028.

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This paper presents an innovative design for reducing the impact of secondary flows on the aerodynamics of low-pressure turbine (LPT) stages. Starting from a state-of-the-art LPT stage, a local reshaping of the stator blade was introduced in the end-wall region in order to oppose the flow turning deviation. This resulted in an optimal stator shape, able to provide a more uniform exit flow angle. The detailed comparison between the baseline stator and the redesigned one allowed for pointing out that the rotor row performance increased thanks to the more uniform inlet flow, while the stator loss

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Yu, Wenfei, Wei Hua, and Zhiheng Zhang. "High-Frequency Core Loss Analysis of High-Speed Flux-Switching Permanent Magnet Machines." Electronics 10, no. 9 (2021): 1076. http://dx.doi.org/10.3390/electronics10091076.

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Accurate prediction of core losses plays an important role in the design and analysis of flux-switching permanent magnet (FSPM) machines, especially during high-speed and high-frequency operation. Firstly, based on the numerical method, a high-frequency core loss prediction method considering a DC-bias magnetization component and local hysteresis loops as well as the harmonic effect is proposed. Secondly, the magnetizing characteristics of the silicon steel sheet and, consequently, the core loss of the electrical steel used as the core lamination are measured. Then, the loss coefficient of eac

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Cui, Hong, and You Qing Gao. "Research on the Influence of Harmonics on High-Speed Permanent Magnet Motor." Advanced Materials Research 690-693 (May 2013): 3275–78. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.3275.

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The influence of current harmonics on high-speed permanent magnet motor is analyzed in this paper. The several aspects influence of current harmonics are analyzed in detail such as on the stator core losses, copper losses, as well as additional losses, the rotor losses, the electromagnetic torque etc. The necessity of suppressing current harmonics for high-speed motor stable and reliable running and the key issues of high-speed motor control system stable operation is stated.

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Gorrell, Steven E., Theodore H. Okiishi, and William W. Copenhaver. "Stator-Rotor Interactions in a Transonic Compressor— Part 1: Effect of Blade-Row Spacing on Performance." Journal of Turbomachinery 125, no. 2 (2003): 328–35. http://dx.doi.org/10.1115/1.1540119.

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Usually less axial spacing between the blade rows of an axial flow compressor is associated with improved efficiency. However, mass flow rate, pressure ratio, and efficiency all decreased as the axial spacing between the stator and rotor was reduced in a transonic compressor rig. Reductions as great as 3.3% in pressure ratio, and 1.3 points of efficiency were observed as axial spacing between the blade rows was decreased from far apart to close together. The number of blades in the stator blade-row also affected stage performance. Higher stator blade-row solidity led to larger changes in press

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