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Journal articles on the topic 'EMF harmonics'

Author: Grafiati
Published: 4 June 2025
Last updated: 1 August 2025

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1

Ji, Yanpeng, Bin Li, and Jingcheng Sun. "Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control." Journal of Control Science and Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/3530127.

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This paper investigates the relationship between current, back electromotive force (back-EMF), and torque for permanent-magnet brushless DC (PM BLDC) motors under advanced commutation control from the perspective of harmonics. Considering that the phase current is the influencing factor of both torque and torque ripple, this paper firstly analyzes the effects of advanced commutation on phase current and current harmonics. And then, based on the harmonics of the phase current and back-EMF, the torque harmonic expressions are deduced. The expressions reveal the relationship of harmonic order bet
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2

Almarhoon, Ali, Yuan Ren, and Z. Q. Zhu. "Influence of back-EMF and current harmonics on sensorless control performance of single and dual three-phase permanent magnet synchronous machines." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, no. 2 (2016): 744–63. http://dx.doi.org/10.1108/compel-12-2015-0441.

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Purpose – The purpose of this paper is to investigate the influence of back-EMF and current harmonics on position and speed estimation accuracy for single and dual three-phase (DTP) permanent magnet synchronous machines (PMSMs) with two fundamental-model-based sensorless control strategies which are widely utilized for AC machines, i.e. flux-linkage observer (FO) and simplified extended Kalman filter (EKF). Design/methodology/approach – The effect of distorted back-EMF is studied for sensorless vector control of single three-phase PMSM. For the influence of current harmonics, unlike the existi
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3

Abdullah, Nurfaezah, Raja Nor Firdaus Raja Othman, Kasrul Abdul Karim, and Lim Seng Tat. "Analysis on EMF characteristics for torque ripple reduction in BLAC motor intended for HVLS fan application." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 4 (2020): 2203. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp2203-2211.

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This paper analyzes the harmonic characteristics of electromagnetic force (EMF) in Brushless Alternating Current (BLAC) motor for High Volume Low Speed (HVLS) fan application. Vibration and noise are one of the main crucial things in HVLS fan application. It comes from torque ripples which can be detected by harmonics of Electro Magnetic Force (EMF). Commonly, there are a few methods to eliminate the noise and vibrations issue, but most literatures only focus on small motor and not intended for HVLS fan application. Thus, the objective of this paper is to eliminate the harmonics content in EMF
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4

Nurfaezah, Abdullah, Nor Firdaus Raja Othman Raja, Abdul Karim Kasrul, and Seng Tat Lim. "Analysis on EMF characteristics for torque ripple reduction in BLAC motor intended for HVLS fan application." International Journal of Power Electronics and Drive System (IJPEDS) 11, no. 4 (2020): 2203–11. https://doi.org/10.11591/ijpeds.v11.i4.pp2203-2211.

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This paper analyzes the harmonic characteristics of electromagnetic force (EMF) in Brushless Alternating Current (BLAC) motor for High Volume Low Speed (HVLS) fan application. Vibration and noise are one of the main crucial things in HVLS fan application. It comes from torque ripples which can be detected by harmonics of Electro Magnetic Force (EMF). Commonly, there are a few methods to eliminate the noise and vibrations issue, but most literatures only focus on small motor and not intended for HVLS fan application. Thus, the objective of this paper is to eliminate the harmonics content in EMF
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5

Huang, Po-Sheng, Cheng-Ting Tsai, Jonq-Chin Hwang, Cheng-Tsung Lin, and Yu-Ting Lin. "Current Harmonics Suppression of Six-Phase Permanent-Magnet Synchronous Motor Drives Using Back-Electromotive Force Harmonics Compensation." Energies 17, no. 24 (2024): 6280. https://doi.org/10.3390/en17246280.

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This paper investigates a back-electromotive force (EMF) harmonic compensation strategy for six-phase permanent-magnet synchronous motors (PMSMs) to reduce current harmonics and improve system performance. Ideally, the back-EMF waveform should be perfectly sinusoidal. However, manufacturing imperfections such as suboptimal magnetic circuit design, uneven winding distribution, and mechanical eccentricity introduce low-order spatial harmonics, particularly the 5th, 7th, 11th, and 13th orders, which distort the back-EMF, increase current harmonics, complicate control, and reduce efficiency. To ad
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6

Akay, Ali, and Paul Lefley. "Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions." Energies 14, no. 9 (2021): 2615. http://dx.doi.org/10.3390/en14092615.

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This paper presents a method that has been developed to reduce the torque ripples under healthy and open-circuit fault-tolerant (OCFT) conditions for a multiphase permanent magnet (PM) machine. For smooth torque, both the phase current and the back electromotive force (back-EMF) should be purely sinusoidal. To improve the torque in a multiphase machine, higher-order current harmonics are injected, which are related to the harmonics in the back-EMF. For this reason, generally, multiphase machines are designed with higher-order back-EMF harmonics. However, these harmonics produce ripples in the
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7

Wang, Shanming, Yonghong Xia, Shaogang Huang, Arui Qiu, and Xiangheng Wang. "Research on new hybrid excitation PM synchronous generators with tooth harmonic excitation." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 5 (2014): 1613–24. http://dx.doi.org/10.1108/compel-11-2013-0345.

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Purpose – In order to keep the advantages of PM generators and eliminate its disadvantage – difficulty in regulating the magnetic field, hybrid excitation is an effective way. The purpose of this paper is to propose a novel way to achieve hybrid excitation by use of tooth harmonic field. Design/methodology/approach – Unlike weakening the tooth harmonics field and EMF in traditional machines, in this paper the tooth harmonics field is proposed to form a novel hybrid excitation permanent magnet synchronous generator (HEPMSG). Findings – The generation mechanism of tooth harmonic electromotive fo
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8

Karomah, Akhlaqul. "Induction Motor Harmonics Voltage Waveform Analysis based on Machine Constriction." Jurnal EECCIS (Electrics, Electronics, Communications, Controls, Informatics, Systems) 14, no. 2 (2020): 63–67. http://dx.doi.org/10.21776/jeeccis.v14i2.639.

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Abstract— This paper discussed about harmonic analysis in an induction motor. Harmonics on induction motor appear due to the machine construction specially to its slots. The analysis of those harmonic will be one of the problems in the machine observation and design. In this paper a simulated computation of the flux magnet and emf induction voltage containing harmonic is proposed and discussed. FEMM simulation software is used and the result is compared to the mathematical analysis. The result shows that the emf induction harmonics wave derived from mathematic modelling and FEMM conform each
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9

Kazakov, Yu B., and I. S. Egorov. "Electrical system for converting vibration energy based on the combined operation of a linear generator and a magnetic fluid damper." Vestnik IGEU, no. 1 (February 28, 2025): 67–74. https://doi.org/10.17588/2072-2672.2025.1.067-074.

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Linear generators used as autonomous sources of electric power and electromechanical shock absorbers convert vibration energy into electric energy with a linear reciprocating motion of the inductor. The EMF of the generator has a non-sinusoidal shape due to higher spatial and temporal harmonics. The change in the speed of the inductor is determined by the nature of the acting forces, but during the analysis, it is usually taken as harmonic with a sinusoidal distribution of magnetic induction. Reduction of EMF harmonics is possible in an electrical system with a linear generator and a magnetic
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10

Emagbetere, J. O., and P. A. Kuale. "Investigation of Harmonics in Power Generating Systems." Advanced Materials Research 18-19 (June 2007): 99–106. http://dx.doi.org/10.4028/www.scientific.net/amr.18-19.99.

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This paper investigates harmonics in power systems especially harmonics produced by synchronous generators as well as those by distributed generation systems, particularly these days when private generating systems are on the increase in Nigeria. For the work done so far, we found that some generators have near square waves, and these are characterized by their odd harmonics. An investigation of the harmonic emf waves conducted shows that these generators produces harmonic alternating mmf’s and fluxes. All harmonic fluxes produce emfs which are undesirable. The effect of these harmonics result
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11

Barmpatza, Alexandra C., and Joya C. Kappatou. "Study of a Combined Demagnetization and Eccentricity Fault in an AFPM Synchronous Generator." Energies 13, no. 21 (2020): 5609. http://dx.doi.org/10.3390/en13215609.

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This article investigates the combined partial demagnetization and static eccentricity fault in an Axial Flux Permanent Magnet (AFPM) Synchronous Generator. The machine is simulated using 3D FEM, while the EMF spectrum is analyzed in order to export the fault related harmonics using the FFT analysis. Firstly, the partial demagnetization fault, without the coexistence of eccentricity, and both the static angular and axis eccentricity faults, without the coexistence of partial demagnetization, are studied. In the case of eccentricity fault, the phase EMF sum spectrum has also been used as a diag
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12

Yamansarin, Ildar, Mikhail Salikov, Alexander Padeev, and Dmitry Surkov. "An Approach to the Use of an External Magnetic Field As a Diagnostic Sign of an Asynchronous Motor Malfunction." Известия высших учебных заведений. Электромеханика 64, no. 3 (2021): 18–23. http://dx.doi.org/10.17213/0136-3360-2021-3-18-23.

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The article deals with the issues related to the possibility of diagnosing the technical condition of an asyn-chronous electric motor by an external magnetic field. The justification of the problems associated with the di-agnosis of electric motors is given. The difficulties that arise when measuring the external magnetic field of electric motors, as well as the devices with which it is possible to carry out measurements, are described. The re-lationship between the EMF of the sensor and the external magnetic field is shown. The results of processing the EMF waveforms induced by an external ma
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13

Yu, Linxin, and Dazhi Wang. "A Hybrid Filtering Stage-Based Rotor Position Estimation Method of PMSM with Adaptive Parameter." Sensors 21, no. 14 (2021): 4667. http://dx.doi.org/10.3390/s21144667.

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The performance of sensorless control in a permanent magnet synchronous machine (PMSM) highly depends on the accuracy of rotor position estimation. Owing to its strong robustness, phase-locked loop (PLL) is widely used in rotor position estimation. However, due to the influence of harmonics existing in back electromotive force (EMF), estimation error occurs by using PLL. In this paper, a hybrid filtering stage-based PLL is proposed to improve the rotor position estimation. Adaptive notch filters and moving average filters are integrated together to eliminate harmonic EMF. To make the method ef
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14

Akay, Ali, and Paul Lefley. "Open-Circuit Fault-Tolerant Control of Multi-Phase PM Machines by Compensating the d-q Axes Currents." Energies 14, no. 1 (2021): 192. http://dx.doi.org/10.3390/en14010192.

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This paper presents a novel method to control sinusoidal distributed winding or sinusoidal back electromotive force (back-EMF) multi-phase permanent magnet (PM) machines under open-circuit fault conditions. In this study, five different fault conditions are considered: single-phase, adjacent double-phase, non-adjacent double-phase, adjacent three-phase, and non-adjacent three-phase open circuit conditions. New current sets for the remaining healthy phase under open-circuit fault conditions are obtained by compensating the direct-quadrature (d-q) axes currents. For this purpose, an iterative me
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15

Volchek, T. V. "Increasing the switching stability of collector traction electric motors of electric locomotives by reducing pulsation of current excitation." Herald of the Ural State University of Railway Transport, no. 4 (2021): 97–102. http://dx.doi.org/10.20291/2079-0392-2021-4-97-102.

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Statistics of equipment failures of electric locomotives assigned to the operational depots of the East Siberian Traction Directorate shows that about 25% of the total number of equipment failures of electric locomotives are traction electric motors (TEM); most often the collector-brush apparatus fails. The main reason is the problem of TEM low switching stability, associated with the increase in unbalanced electromotive forces (EMF) due to non-sinusoidal values of EMF variables and large phase shifts between their main harmonics. To clarify the processes related to EMF variable components, a
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16

Keysan, Ozan, and Bülent Ertan. "Determination of rotor slot number of an induction motor using an external search coil." Facta universitatis - series: Electronics and Energetics 22, no. 2 (2009): 227–34. http://dx.doi.org/10.2298/fuee0902227k.

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This paper describes determination of the number rotor slots of an induction motor from the induced emf in an external search coil. This information is needed in prediction of motor speed from the external search coil induced voltage. The approach is based on identifying saliency harmonics and rotor slot harmonics, via FFT analysis of the external search coil emf. The proposed approach is tested on an induction motor driven by the mains supply. The experiments are repeated with a PWM supply. It is shown that the method works well in both cases and the number of rotor slots of the test machine
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17

Zhang, Liu, Zhanpeng Cui, Pengfei Song, Liming Wang, and Xikai Liu. "Sinusoidal Rotor Core Shape for Low Torque Ripple in Hollow-Cup Machines." Energies 17, no. 13 (2024): 3168. http://dx.doi.org/10.3390/en17133168.

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Due to the configuration of coreless stators and two synchronously rotated rotors, hollow-cup machines (HCMs) enjoy the merits of negligible cogging torque and core loss. Consequently, HCMs have been successfully employed as high-speed electric machines in the aerospace field, which requires high precision and low thermal dissipation. However, the permanent magnet (PM) thickness and air-gap length of conventional HCM are uniform, resulting in various harmonics in the air-gap flux density as well as back-EMF. These harmonics inevitably produce an electromagnetic torque ripple, which has not met
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18

Grabchuk, B. L., and Yu F. Romaniuk. "Analysis of energy flows in the power supply system with a thyristor voltage converte." METHODS AND DEVICES OF QUALITY CONTROL, no. 1(44) (June 28, 2020): 65–75. http://dx.doi.org/10.31471/1993-9981-2020-1(44)-65-75.

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A numerical analysis of energy flows in a three-phase power supply system with a sine wave EMF source, active load and a thyristor converter that distorts the sine waveform and generates higher harmonics is performed. The influence of the thyristor non-sinusoidal voltage on the energy flows and the power factor of the source is analyzed. Thyristor converter is considered as a nonlinear electric power unit consuming electricity from the primary power source at a fundamental frequency, part of which is converted and returned back to the network as a secondary energy stream of zero-sequence syste
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19

Grishin, A. M., V. F. Drobot’ko, A. A. Mazaev, V. D. Stasovskii, and V. A. Khoklov. "Magnetic response of an YBCO film supporting an alternating current." Low Temperature Physics 19, no. 6 (1993): 453–57. https://doi.org/10.1063/10.0033438.

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A nonlinear induction of magnetic field by alternating current has been experimentally discovered in an YBCO film. The film was loaded with a transport current of frequency 10 kHz and amplitude from 0.25 to 7 mA. The maximum transport current density was 88 A/m2. The emf was measured in a flat coil pressed to the surface of the superconducting film. The observed nonlinear signal is shown to be a superposition of two effects, viz., the Meissner screening of the induced magnetic signal and the emf due to the electric field of the current flowing through the film. In the vicinity of the resistive
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20

Kao, Wei-Tse, Jonq-Chin Hwang, and Jia-En Liu. "Development of Three-Phase Permanent-Magnet Synchronous Motor Drive with Strategy to Suppress Harmonic Current." Energies 14, no. 6 (2021): 1583. http://dx.doi.org/10.3390/en14061583.

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This study aimed to develop a three-phase permanent-magnet synchronous motor drive system with improvement in current harmonics. Considering the harmonic components in the induced electromotive force of a permanent-magnet synchronous motor, the offline response of the induced electromotive force (EMF) was measured for fast Fourier analysis, the main harmonic components were obtained, and the voltage required to reduce the current harmonic components in the corresponding direct (d-axis) and quadrature (q-axis) axes was calculated. In the closed-loop control of the direct axis and quadrature axi
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21

Grant, B. J., L. J. Paradowski, and J. M. Fitzpatrick. "Effect of perivascular electromagnetic flow probes on pulmonary hemodynamics." Journal of Applied Physiology 65, no. 4 (1988): 1885–90. http://dx.doi.org/10.1152/jappl.1988.65.4.1885.

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We determined the effect of perivascular electromagnetic flow probes (EMF) on pulmonary hemodynamics in acute experiments. In seven dogs placement of the EMF on the main pulmonary artery (MPA) increased pulmonary arterial pulse pressure by 25% (17.8-21.9 cmH2O, P less than 0.005) and mean right ventricular pressure by 12% (23.2-25.9 cmH2O, P less than 0.001) but did not alter heart rate, systemic blood pressure, mean pulmonary arterial pressure, or right ventricular end-diastolic pressure. This response was not abolished by local application of lidocaine to the MPA. In three cats input impedan
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22

Cui, Yingjie, Munawar Faizan, and Zhongxian Chen. "Back EMF Waveform Comparison and Analysis of Two Kinds of Electrical Machines." World Electric Vehicle Journal 12, no. 3 (2021): 149. http://dx.doi.org/10.3390/wevj12030149.

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In this study, the back electromotive force (EMF) waveforms of a flux switching permanent magnet (FSPM) machine and variable flux memory permanent magnet (VFMPM) machine with same main dimension were researched. Firstly, the simulation result showed that the maximum amplitude of phase back EMF waveform of FSPM machine was 245% larger than that of the VFMPM machine, and this was verified by the experimental result (243%). Secondly, the phase back EMF harmonics of the FSPM machine and VFMPM machine were compared, including the enhance flux condition and weaken flux condition of VFMPM machine. At
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23

Uygun, Emre, Daniel Depernet, Vincent Lanfranchi, et al. "Impact of the load angle on magnetic radial pressure and torque ripple of a low power PMSM with trapezoidal control." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 5 (2020): 1255–70. http://dx.doi.org/10.1108/compel-01-2020-0047.

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Purpose This paper deals with the study of the influence of the phase shift between currents and back-electromotive forces (back-EMF) on torque ripple and radial magnetic forces for a low power synchronous machine supplied with 120 degrees square-wave currents. This paper aims to establish a good compromise between efficiency, harmonics of torque and harmonics of radial forces at the origin of the electromagnetic noise. Design/methodology/approach Based on a finite element approach, torque and magnetic pressure harmonics versus space and frequency are evaluated for different angle values. The
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24

Lv, Haiying, Lei Zhang, Chunya Yao, Qiang Sun, Jingjuan Du, and Xueyong Chen. "An Improved Permanent Magnet Synchronous Motor Rotor Position Observer Design Based on Error Harmonic Elimination." Machines 10, no. 8 (2022): 633. http://dx.doi.org/10.3390/machines10080633.

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An improved rotor position observer based on sliding mode control was proposed to eliminate estimation error and harmonic ripples for PMSM sensorless control. A multi-proportional resonant filter was designed instead of a low-pass filter to filter out the specific harmonics of back EMF. The improved filter can solve the phase delay problem caused by a low-pass filter, eliminate the rotor angle compensator, simplify the system structure, and effectively suppress the system chattering. Then, a fractional normalized phase-locked loop was adopted to calculate the speed and rotor position, further
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25

Serebryakov, A., E. Kamolins, K. Gulbis, and K. Sejejs. "Effectiveness of the Tooth Zone of Inductor Electric Machine." Latvian Journal of Physics and Technical Sciences 55, no. 3 (2018): 3–15. http://dx.doi.org/10.2478/lpts-2018-0016.

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Abstract The authors consider several tens of rotor tooth and slot profiles for the inductor electric machine in order to gain the maximum EMF of the armature winding at the minimum of highest harmonics, owing to which the specific power and efficiency of the machine can be raised. The research considers usage of analytical methodology and finite element method (FEM), where the latter includes magnetic saturation and actual magnetic field line distribution. The main data of both calculations are summarised in the results of the study. From the obtained results, it can be concluded that, in mos
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26

Tuz, Yulian, and Oleg Kozyr. "Voltage spectral structure of the thermocouple with temperature dependent wires." Ukrainian Metrological Journal, no. 2 (July 2, 2021): 73–76. http://dx.doi.org/10.24027/2306-7039.2.2021.236102.

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The article presents a study of the origin of extra harmonics in the frequency spectrum of thermocouple output signal when being heated by sinusoidal waveform current. It is natural to have the first harmonic, which arises according to Ohm’s law, as a product of current and the total resistance of thermocouple and junction conductors, as well as the Peltier, Thomson effects, and the presence of the second harmonic, which is caused by a heating of junction and thermocouple conductors. The fact that third and higher harmonics arise when the resistance of conductors and junction is thermally depe
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27

Li, Hua, and Fang Liu. "The Electromagnetic Field Analysis of Permanent Magnet Synchronous Generator Based on ANSYS." Advanced Materials Research 301-303 (July 2011): 1693–98. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1693.

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This paper uses ANSYS 10.0 software to analyze and calculate electromagnetic field of the Permanent Magnet Synchronous Generator(PMSG). Verify rationality of magnetic circuit by the results of magnetic flux density and magnetic field intensity; optimize shape of permanent magnet and reduce harmonics quantity by air-gap flux density harmonics analysis, and use value to solve Electromotive Force(EMF). The simulation result proves that the model satisfies the design requirements and can provide theoretical guide for the optimization design of PMSG.
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28

Antonov, Alexander I., Dmitry Yu Rudy, and Konstantin V. Khatsevsky. "Study of the quality of electric power in electric networks with semiconductor converters." Yugra State University Bulletin 19, no. 1 (2023): 123–30. http://dx.doi.org/10.18822/byusu202301123-130.

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At present, semiconductor converters have found wide application in the electric power industry [6]. One of the most common semiconductor converters is a frequency converter, as it provides a three-phase voltage with adjustable frequency from a three-phase mains voltage. However, it, like other semiconductor converters, is the cause of the appearance of harmonics and, as a result, the non-sinusoidal shape of the voltage curve [1]. Harmonics are the cause of such negative effects in the electrical network as concomitant heating of the windings of motors, transformers, etc., false alarms in dist
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29

Bendík, Jozef, Matej Cenký, and Žaneta Eleschová. "The Influence of Harmonic Content on the RMS Value of Electromagnetic Fields Emitted by Overhead Power Lines." Modelling 5, no. 4 (2024): 1519–31. http://dx.doi.org/10.3390/modelling5040079.

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This paper investigates the influence of harmonic content on the root mean square value of electromagnetic fields emitted by overhead power lines. The paper presents a methodology to assess the intensity of electric field and magnetic flux density, incorporating both fundamental frequencies and harmonics. The results of our calculations indicate that harmonic distortion in current waveforms can significantly increase the RMS value of magnetic flux density but its effect on electric field intensity is minimal. Additionally, our findings highlight a potential increase in induced voltages on buri
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Radwan-Pragłowska, Natalia, and Tomasz Wegiel. "Diagnostics of Interior PM Machine Rotor Faults Based on EMF Harmonics." Energies 17, no. 9 (2024): 2198. http://dx.doi.org/10.3390/en17092198.

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This article presents a detailed study on the diagnosis of rotor faults in an Interior Permanent Magnet Machine based on a mathematical model. The authors provided a wide literature review, mentioning the fault diagnosis methods used for Permanent Magnet Machines. The research emphasizes the necessity of precise assumptions regarding winding construction to accurately analyze the additional harmonics appearing in rotor faults caused by electromotive force (EMF), i.e., rotor eccentricity and magnet damage. The article also discusses specific features appearing in the spectrum of air gap permean
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31

Tran, T. Q., L. E. Conrad, and B. K. Stallman. "Electric shock and elevated EMF levels due to triplen harmonics." IEEE Transactions on Power Delivery 11, no. 2 (1996): 1041–49. http://dx.doi.org/10.1109/61.489366.

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32

Zheng, Ping, Jin Gang Bai, Yi Sui, Cheng De Tong, and Bin Yu. "Investigation of a Single-Phase Oscillating PM Alternator for Free-Piston Stirling Engines." Applied Mechanics and Materials 416-417 (September 2013): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.73.

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A single-phase oscillating PM alternator is proposed for Free-Piston Stirling Engines. According to its sinusoidal kinetic characteristic, the design principle of this machine is proposed and on this basis, the finite-Element model is built. In the generator mode, the flux linkage, back EMF, voltage harmonics distortion ratio and thrust ripple are deeply analyzed. Due to the significance of the no-load back EMF, some structural parameters, like the permanent magnet thickness, the mover yoke thickness and the width of the tooth, are further optimized. After obtaining the optimal scheme, the ele
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33

Fang, Hong Wei, Si Yuan Fang, Jia Jia Cheng, and Jing Lian. "Investigation of Internal Faults for a Direct-Driven PMSG with Maxwell." Advanced Materials Research 760-762 (September 2013): 1364–68. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.1364.

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The electro-magnetic torque and current are analyzed for a static eccentric PMSG. The characteristics of air-gap magnetic field, EMF, current and electro-magnetic torque of the direct driven PMSG for wind power generation are investigated with Maxwell software various eccentric conditions. The related electrical magnetic torque and current variation are achieved, especially the harmonics for current and torque.
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Bai, Xiyue, Weiguang Huang, Chuang Gao, and Yingna Wu. "Sensorless Control of Ultra-High-Speed PMSM via Improved PR and Adaptive Position Observer." Sensors 25, no. 5 (2025): 1290. https://doi.org/10.3390/s25051290.

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To improve the precision of the position and speed estimation in ultra-high-speed (UHS) permanent magnet synchronous motors (PMSM) without position sensors, multiple refinements to the traditional extended electromotive force (EEMF) estimation algorithm are proposed in this paper. The key improvements include discretization compensation, high-frequency harmonic filtering, and the real-time adjustment of the phase-locked loop (PLL) bandwidth. Firstly, a discrete model is introduced to address EMF cross-coupling issues. Secondly, an improved proportional resonant (IPR) controller eliminating sta
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Washington, Jamie G., Glynn J. Atkinson, and Nick J. Baker. "Reduction of Cogging Torque and EMF Harmonics in Modulated Pole Machines." IEEE Transactions on Energy Conversion 31, no. 2 (2016): 759–68. http://dx.doi.org/10.1109/tec.2016.2520200.

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36

Lai, Yiyu, Antoine Cizeron, Adrien Voldoire, Javier Ojeda, and Olivier Béthoux. "Analysis of DC-Link Low-Frequency Current Harmonics in Multi-Source Multi-Three-Phase Electric Drives." Electronics 13, no. 12 (2024): 2236. http://dx.doi.org/10.3390/electronics13122236.

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In a multi-source permanent magnet synchronous motor (PMSM) drive, three distinct winding structures can be implemented: multi-sector, multi-three-phase, and highly coupled. However, due to variations in the magnetic coupling between windings, their low-frequency DC-link current ripple components differ. This paper presents a method to identify the phenomena associated with each low-frequency harmonic content. Three analytical models are developed for the DC current ripple induced by unbalanced winding, counter-electromotive force (back-EMF) harmonics and aliasing effects, respectively, with t
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37

Khan, Sohail, Serguei Maximov, Rafael Escarela-Perez, Juan Carlos Olivares-Galvan, Enrique Melgoza-Vazquez, and Irvin Lopez-Garcia. "Computation of Stray Losses in Transformer Bushing Regions Considering Harmonics in the Load Current." Applied Sciences 10, no. 10 (2020): 3527. http://dx.doi.org/10.3390/app10103527.

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The presence of harmonics in the load current considerably increases stray losses in electric transformers. In this research paper, a new model for computing the electromagnetic field (EMF) and eddy current (EC) losses in transformer tank covers is derived considering harmonics. Maxwell’s equations are solved with their corresponding boundary conditions. The differential equation thus obtained is solved using the method of separation of variables. The obtained expressions do not require the use of special functions, accommodating them for practical implementation in the industry. The obtained
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Bao, Danyang, Huiming Wu, Ruiqi Wang, Fei Zhao, and Xuewei Pan. "Full-Order Sliding Mode Observer Based on Synchronous Frequency Tracking Filter for High-Speed Interior PMSM Sensorless Drives." Energies 13, no. 24 (2020): 6511. http://dx.doi.org/10.3390/en13246511.

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In the research of the high-speed sensorless control strategy of an interior permanent-magnet synchronous motor (IPMSM), considering the harmonic influence of inverter nonlinearity on traditional sliding mode observer method, a full-order sliding mode observer (SMO) method based on synchronous frequency tracking filtering is proposed. This method avoids the phase delay defects caused by the use of filters in traditional second-order SMO. Then, the observed extended electromotive force (EMF) signal is filtered using a synchronous frequency tracking (SFT) function. It tracks the changing stator
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39

Saetti, Umberto, and Joseph F. Horn. "Load Alleviation Flight Control Design using High-Order Dynamic Models." Journal of the American Helicopter Society 65, no. 3 (2020): 1–15. http://dx.doi.org/10.4050/jahs.65.032009.

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The present study considers two notional rotorcraft models: a conventional utility helicopter, representative of an H-60, and a wing-only compound utility rotorcraft, representative of an H-60 with a wing similar to the X-49A wing. An explicit model following (EMF) control scheme is designed to achieve stability and desired rate command / attitude hold response around the roll, pitch, and yaw axes, while alleviating vibratory loads through both feed-forward and feedback compensation. The harmonic decomposition methodology is extended to enable optimization of primary flight control laws that m
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Cawkwell, Thomas, Ahmed Haris, Juan Manuel Gonzalez, Leon Kevin Rodrigues, and Vladimir Shirokov. "A Methodology for Applying Skew in an Automotive Interior Permanent Magnet Rotor for Robust Electromagnetic and Noise, Vibration and Harshness Performance." World Electric Vehicle Journal 14, no. 12 (2023): 350. http://dx.doi.org/10.3390/wevj14120350.

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Interior permanent magnet (IPM) motors in traction applications often employ discrete rotor skewing constructions to reduce torsional excitations and back-EMF harmonics. Although skewing is very effective in reducing cogging torque, the impact on torque ripple is not well understood and can vary significantly over the operating envelope of a motor. Skewing also leads to the creation of a non-zero axial force that may compromise the bearing life if not considered. This paper introduces a holistic methodology for analyzing the effect of skewing, aiming to minimize torsional excitations, axial fo
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Drozdowski, Piotr. "Modelling of BLDCM with a double 3-phase stator winding and back EMF harmonics." Archives of Electrical Engineering 64, no. 1 (2015): 53–66. http://dx.doi.org/10.1515/aee-2015-0006.

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Abstract In this paper the mathematical model of the brushless DC motor (BLDCM) with a double 3-phase stator winding is analysed. Both the 3-phase windings are mutually displaced by 30 electrical degree. Special care has been sacrificed to influence of higher harmonics of induced electromotive forces (EMF) on electromagnetic torque and zero sequence voltages that may be used for sensorless control. The mathematical model has been presented in natural variables and, after transformation to symmetrical components, in a vector form. This allows, from one side, for formulating the equivalent circu
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Zhang, Bing Yi, Ji Wang, Gang Cui, Gui Hong Feng, and Min Zhao. "Study on the Influence of Skewed Pole on Cogging Torque of PMSM." Advanced Materials Research 443-444 (January 2012): 1066–71. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.1066.

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Skewed pole is a kind of effective structure which can weaken the cogging torque in surface mounted permanent magnet synchronous motor (PMSM), as well as reduce noise and vibration. In this paper, the most appropriate skewed pole angle was calculated and the influence of skewed pole on the machine performance, such as cogging torque, back EMF and harmonics were analyzed. The correction of the conclusion is verified by using Maxwell 3D FEA software.
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Buyakova, N. V., V. P. Zakaryukin, A. V. Kryukov, and D. A. Seredkin. "Simulation of Electromagnetic Fields Generated by Overhead Power Lines and Railroad Traction Networks." Energy Systems Research, no. 2(14) (July 23, 2021): 70–88. http://dx.doi.org/10.38028/esr.2021.02.0007.

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The establishment of smart grids requires special attention to the safety of power industry facilities and the reduction in their negative impact on personnel and the environment. A significant factor of such an impact is the considerable intensities of electromagnetic field (EMF) generated by such facilities. In the context of power industry digitalization, the development of methods and tools for EMF digital simulation is needed to ensure the electromagnetic safety of the service personnel. Computer models designed to adequately determine the EMF generated by overhead power lines (OPL) can b
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Cho, K. Y. "Torque harmonics minimisation in permanent magnet synchronous motor with back EMF estimation." IEE Proceedings - Electric Power Applications 141, no. 6 (1994): 323. http://dx.doi.org/10.1049/ip-epa:19941474.

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Wang, Wei Jun, Wen Qiang Wang, Huan Zhang, Long Bo Mao, Sheng Ye, and Guo Ping Zhang. "Performance Analysis of PMLSG for Wave Power Generation Based-On Different Magnetization Methods." Advanced Materials Research 1051 (October 2014): 980–84. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.980.

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With the progress of linear motors and permanent magnet materials, three kinds of magnetization methods have developed for permanent magnet linear motor. Based on the analysis of magnetic field distribution of radial, Halbach and tangential magnetization, the impacts are investigated of these methods on performances of permanent magnet linear synchronous generator (PMLSG) through simulation. Advantages and disadvantages of these methods are unveiled by studying and comparing their flux linkage, magnetic detent force and EMF harmonics. A conclusion can be drawn that radial magnetization suits P
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Jin, Yong-Sin, Hag-Wone Kim, Kwan-Yuhl Cho, and Byung-Kuk Lim. "Torque Ripple Reduction based on Flux Linkage Harmonics Observer for an Interior PM Synchronous Motor including Back EMF Harmonics." Transactions of the Korean Institute of Power Electronics 18, no. 4 (2013): 367–75. http://dx.doi.org/10.6113/tkpe.2013.18.4.367.

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47

Yang, Yongjie, and Xudong Liu. "A Novel Nonsingular Terminal Sliding Mode Observer-Based Sensorless Control for Electrical Drive System." Mathematics 10, no. 17 (2022): 3123. http://dx.doi.org/10.3390/math10173123.

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To improve the sensorless control performance of electrical drive systems, a nonsingular terminal sliding mode observer (NTSMO) and adaptive observer are proposed to solve the chattering and phase delay problems. Firstly, by defining a new nonsingular terminal sliding mode surface, the sliding mode observer based on the fast reaching law is designed to estimate the back electromotive force (EMF). The observer enhances the robustness and system performance eliminates the singularity and attenuates the chattering. Next, to obtain the accurate back-EMF signal, an adaptive observer is designed ins
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48

Lee, Dong-Kyu, and Jong-Suk Ro. "Analysis and Design of a High-Performance Traction Motor for Heavy-Duty Vehicles." Energies 13, no. 12 (2020): 3150. http://dx.doi.org/10.3390/en13123150.

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Due to environmental issues and depletion of resources, global attentiveness in electric vehicles (EVs) is growing. In particular, research on high specification motors for driving large EVs has attracted a lot of attention. In this study, an analysis and design process for a motor that can be universally applied in heavy vehicles to reduce environmental pollution was introduced. Motors for driving heavy vehicles require high specifications. Thus, an interior permanent magnet synchronous motor (IPMSM) with a delta-shaped magnet array was used to improve the torque and power characteristics. A
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49

Bang, Tae-Kyoung, Kyung-Hun Shin, Jeong-In Lee, Hoon-Ki Lee, Han-Wook Cho, and Jang-Young Choi. "Experimental and Comparative Study of Rotor Vibrations of Permanent Magnet Machines with Two Different Fractional Pole/Slot Combinations." Applied Sciences 10, no. 24 (2020): 8792. http://dx.doi.org/10.3390/app10248792.

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This study deals with the noise, vibration, and harshness (NVH) characteristic analysis of permanent magnet synchronous motors (PMSMs) for electrical machines, such as electrically driven tools that are used in industries. An improved NVH design is needed for application to industrial tools. In general, the electromagnetic NVH characteristics of PMSMs are classified into electromagnetic excitation sources, such as total harmonic distortion of EMF, torque pulsation, magnetic pull force, and unbalanced magnetic force (UMF). This study compares the vibration and noise generated by fractional pole
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50

Rubtsova, Nina B., Sergey Yu Perov, Olga V. Belaya, and Tatiana A. Konshina. "New aspects of power grid facilities personnel workplaces electromagnetic environment." Russian Journal of Occupational Health and Industrial Ecology 60, no. 9 (2020): 569–74. http://dx.doi.org/10.31089/1026-9428-2020-60-9-569-574.

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Introduction. Electromagnetic safety of power grid facilities staff requires the exclusion of electromagnetic fields (EMF) harmful effects. EMF is evaluated by 50 Hz electric and magnetic fields (EF and MF) values in the framework of working conditions special assessment, and very rarely the analysis of the electromagnetic environment (EME) is carried out in depth. The aim of the study - EME hygienic assessment of power grid EHV facilities personnel workplace with adequate 50 Hz EF and MF levels evaluation as well as the analysis of EF and MF in the frequency range from 5 Hz to 500 Hz amplitud
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