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Journal articles on the topic 'Constant magnet'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Pan, Xue Hai. "Constant Voltage Analysis of Permanent Magnet Generator." Applied Mechanics and Materials 63-64 (June 2011): 970–73. http://dx.doi.org/10.4028/www.scientific.net/amm.63-64.970.

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This paper discusses and analysis the constant voltage of vehicle applied permanent magnet generator. The permanent magnet can produce magnetic field in an air gap with no excitation winding and no dissipation of electric power, when the rotor turns, the magnet field turns, the generator generates electricity, with the permanent magnet material of high remnant magnetic induction and the optimized design of the generator, the output voltage is improved when the engine at low speed. We develop a single-phase double half-wave electric regulator is to ensure the stability of the output voltage and

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2

Radovinsky, Alexey L., Leslie Bromberg, Joseph V. Minervini, et al. "Constant Field Toroidal SMES Magnet." IEEE Transactions on Applied Superconductivity 26, no. 3 (2016): 1–4. http://dx.doi.org/10.1109/tasc.2015.2509246.

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3

Xin, Yuanxu, and Xudong Wang. "Time constant analysis of micromotors for virtual reality helmets." Journal of Physics: Conference Series 2378, no. 1 (2022): 012072. http://dx.doi.org/10.1088/1742-6596/2378/1/012072.

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Abstract This paper focuses on the study of an ultra-micro permanent magnet stepper motor with automatic adjustment of interpupillary distance for VR helmets. To precisely adjust the rotation of the motor, the control requirements for the motor are very important, which also makes the time constant of the micro permanent magnet stepper motor of great significance. Starting from the voltage, torque balance equations and thermal balance equations, the paper analyzes and compares the electrical time constant, mechanical time constant, electromechanical time constant and thermal time constant of t

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Darmawan, Isra' Nuur, Asroful Abidin, Muhammad Afif Makruf Ramadhan, and Achmad Rizki. "Effect of Magnet Thickness and Width Variation on Back EMF of 18-Slot 16-Pole Permanent Magnet Synchronous Generator." Applied Engineering, Innovation, and Technology 1, no. 1 (2024): 39–46. http://dx.doi.org/10.62777/aeit.v1i1.11.

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Permanent magnet synchronous generators (PMSG) converts mechanical energy into electrical energy through electromagnetic induction, with the excitation field generated by permanent magnets instead of coils. This paper investigates the effects of varying magnet thickness and width on the back electromotive force (back EMF) of an 18-slot 16-pole PMSG using finite element method (FEM) simulations. The aim is to understand how these geometric parameters influence the back EMF values, which are crucial for generator design and performance evaluation. The FEM modelling results show that a 5 mm magne

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Son, Rak-Won, and Ju Lee. "Alternative Surface-Mounted Permanent Magnet Topology for Reducing Voltage and Torque Harmonics in Shaft Generators." Energies 16, no. 12 (2023): 4649. http://dx.doi.org/10.3390/en16124649.

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Traditional diesel generators on a merchant ship, composed of a wound rotor synchronous generator and a four-stroke diesel engine, supply electrical power for various loads. Recently, shaft generators for merchant ships have been increasingly replacing diesel generators to reduce CO2 emissions through fuel efficiency improvement. In particular, permanent magnet synchronous generators have replaced induction generators due to their high-efficiency characteristics at light loads. The surface-mounted permanent magnet rotor can be a suitable topology owing to the relatively short constant power ra

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Akinloye, B. O., and G. O. Uzedhe. "Controllable single-phase smart synchronous generator towards solar-pneumatic power generation." Nigerian Journal of Technology 39, no. 2 (2020): 493–99. http://dx.doi.org/10.4314/njt.v39i2.19.

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This paper presents the development of a controllable single-phase surface-mounted permanent magnet synchronous generator (SPSMPMSG) for low speed applications. Presently, the world is faced with degrading climatic conditions that may be worsen if energy need is met by fossil fuel and other conventional means of generation. On the other hand, renewable alternatives are not always of constant speed, and are usually not high enough to turn conventional alternators. There is therefore a need for the development of alternators that can generate electricity from low speed sources. The development o

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Bolyukh, V. F., G. M. Suchkov, R. P. Mygushchenko, and M. E. Kalnytskyi. "Determination of parameters of an autonomous source of a constant magnetic field for a portable electromagnetic-acoustic transducer." Electrical Engineering & Electromechanics, no. 4 (July 2, 2025): 72–79. https://doi.org/10.20998/2074-272x.2025.4.09.

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Purpose. Determination of rational parameters of an autonomous source of constant magnetic field, ensuring the efficiency of using portable electromagnetic-acoustic transducers (EMAT) for diagnostics of remote ferromagnetic objects. Methodology. An analysis of the parameters of an autonomous magnetic field source consisting of a permanent magnet and a ferromagnetic screen magnetizing a ferromagnetic object with a flat surface, providing a central magnetic field along the magnet axis above 0.3 T, was carried out. Results. The results of experimental studies on a sample of an autonomous source,

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Heydari, M. B., M. Asgari, L. Gharib, A. Keshtkar, N. Jafari, and M. Zolfaghari. "A Novel Augmented Railgun Using Permanent Magnets." Advanced Electromagnetics 8, no. 1 (2019): 99–105. http://dx.doi.org/10.7716/aem.v8i1.961.

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A novel augmented railgun using a permanent magnet is proposed in this paper. The effects of the permanent magnet on the magnetic field and distribution of current density have been investigated. High current densities in the railguns can lead to high local temperature and erosion of the rails. Therefore, the current densities in the rails and armature should be decreased without the reduction of the Lorentz force which is required for acceleration. For this purpose, augmentation of the magnetic field can be used as an effective method. The Finite Element Method (FEM) simulations have been app

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9

Armando, Eric, Sandro Rubino, Aldo Boglietti, Enrico Carpaneto, Salvatore Musumeci, and Daniele Martinello. "A Test Procedure to Evaluate Magnets Thermal Time Constant of Permanent Magnet Machines." IEEE Transactions on Industry Applications 57, no. 5 (2021): 4694–706. http://dx.doi.org/10.1109/tia.2021.3090745.

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10

SUMMERS, D. J. "MUON ACCELERATION USING FIXED FIELD, ALTERNATING GRADIENT (FFAG) RINGS." International Journal of Modern Physics A 20, no. 16 (2005): 3861–64. http://dx.doi.org/10.1142/s0217751x05027813.

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Given their 2.2 μs lifetime, muons must be accelerated fairly rapidly for a neutrino factory or muon collider. Muon bunches tend to be large. Progress in fixed field, alternating gradient (FFAG) lattices to meet these challenges are reviewed. FFAG magnets are naturally wide; low momentum muons move from the low field side of a gradient magnet to the high field side as they gain energy. This can be exploited to do double duty and allow a large beam admittance without unduly increasing the magnetic field volume. If the amount of RF must be reduced to optimize cost, an FFAG ring can accommodate e

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11

Mohammad, Ummu Atiqah Khairiyah B., A. K. M. Nurul Amin, Mohd Redzuan Bin Abdul Rappat, and Muammer D. Arif. "Effect of Application of a Combination of Magnets on Chatter Amplitude Reduction in Turning of Stainless Steel AISI 304." Applied Mechanics and Materials 393 (September 2013): 189–93. http://dx.doi.org/10.4028/www.scientific.net/amm.393.189.

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This paper presents the results of experimental investigations of vibration analysis conducted on Engine Lathe Harrison M390 using variable cutting speed, feed rate and depth of cut at constant tool overhang of 120mm as the machining parameters ascertain the effectiveness of TiN coated carbide insert in turning of hardened steel AISI 304. The experiments were designed based on the Response Surface Methodology (RSM) approach using DESIGN EXPERT (DOE) software to enhance statistical model using the capabilities of RSM to compare the effectiveness of application of a combination of a bottom and a

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Nor, Aishah Md Zuki, Nor Firdaus Kashfi Raja Othman Raja, Azhar Abdul Shukor Fairul, and Rizuan Che Ahmad Suhairi. "Analysis of linear motor with symmetrical EMF vector for household elevator application." International Journal of Power Electronics and Drive Systems 14, no. 01 (2023): 51~59. https://doi.org/10.5281/zenodo.7514480.

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Linear permanent magnet synchronous motor (LPMSM) has emerged as a viable alternative to other linear motors for higher thrust lifting action. With the advancement of permanent magnets, LPMSM could contribute to energy conversation while also being suitable for applications requiring higher thrust, such as elevator. However, because the existing LPMSM is larger in size, it requires more space to be equipped with a household elevator. To address this issue, a new LPMSM with increased thrust capability has been proposed. The new LPMSM is modelled and analyzed in terms of back EMF and force in th

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Karthick, K., S. Ravivarman, Ravi Samikannu, K. Vinoth, and Bashyam Sasikumar. "Analysis of the Impact of Magnetic Materials on Cogging Torque in Brushless DC Motor." Advances in Materials Science and Engineering 2021 (December 17, 2021): 1–10. http://dx.doi.org/10.1155/2021/5954967.

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The cogging torque is the most significant issue in permanent magnet applications, since it has a negative impact on machine performance. In this article, the impact of magnetic materials on cogging torque is analyzed on brushless DC motors (BLDC). The effect of neodymium magnets (NdFeB), compression molded magnet, and samarium cobalt (SmCo) magnet on the cogging torque is analyzed to the BLDC motor designed for hybrid electric vehicle traction that has the peak power rating of 50 kW motor with 48 stator slots and 8 rotor poles. With the presence of these three magnetic materials, the cogging

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14

Xing, Feng, Jiajia Zhang, Mingming Zhang, and Caiyan Qin. "Design and Multi-Objective Optimization of an Asymmetric-Rotor Permanent-Magnet-Assisted Synchronous Reluctance Motor for Improved Torque Performance." Applied Sciences 14, no. 15 (2024): 6734. http://dx.doi.org/10.3390/app14156734.

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Permanent-magnet-assisted synchronous reluctance motors (PMA-SynRMs) are widely used in modern industry as a kind of electromagnetic energy conversion device with high output torque, high power density, high efficiency, and excellent speed regulation. In this paper, an asymmetric-rotor PMA-SynRM combined with a Halbach array is proposed based on the conventional PMA-SynRM without modifying the amount of permanent magnet. With the finite element no-load analysis, it is proven that the permanent magnet arrangement of this method can achieve better flux focusing effect and magnetic-axis-shift (MA

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15

Nagaya, K., and N. Arai. "Analysis of a Permanent Magnet Levitation Actuator With Electromagnetic Control." Journal of Dynamic Systems, Measurement, and Control 113, no. 3 (1991): 472–78. http://dx.doi.org/10.1115/1.2896434.

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This paper proposes an actuator in the magnetic levitation system using a permanent magnet and an electromagnet. In this system, the gravity force of the masses is supported by a strong permanent magnet in which two identical poles face each other. The vibration due to external disturbances is controlled by use of the electromagnet by changing magnetic fluxes of one of the permanent magnets. The analytical expressions for obtaining the levitation force, spring constant, and the control force versus the electric current in the electromagnet were derived using the equation of the electromagnetic

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16

Martino, Michele. "Low-Frequency Analytical Model of Superconducting Magnet Impedance." Modelling and Simulation in Engineering 2022 (November 7, 2022): 1–13. http://dx.doi.org/10.1155/2022/2105847.

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A superconducting magnet for particle accelerators is often modeled as an ideal inductor, as it indeed exhibits a completely negligible resistance; this is fully satisfactory, as an example, for control purposes, as the time constant formed by the magnet inductance and the resistance of normal conducting cables connecting it to the power converter accurately describe the essentially dominant dynamics of the circuit. Such a model would however fail to correctly represent the noise attenuation mechanism at play in practical superconducting magnets, which also include a vacuum pipe or a beam scre

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17

Franse, J. J. M., and N. Miura. "Science and Techniques Using Pulsed Magnetic Fields." MRS Bulletin 18, no. 8 (1993): 44–49. http://dx.doi.org/10.1557/s0883769400037763.

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In this article, we examine materials behavior in the magnetic field region from about 40 T to 500 T using pulsed magnet technology. Examples of materials science using two different pulsed magnet technologies are described in this article.Semicontinuous MagnetsSince the late 1960s, the University of Amsterdam has operated a semicontinuous magnetic field installation that produces magnetic fields up to 40 T with typical time constants of about one second. The magnet coil is constructed from hard-drawn copper wire with a reinforcement cylinder of maraging steel positioned at roughly one third o

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18

Frishman, Ye M., and M. I. Umanov. "Comparative analisys of vertical and horizontal static interaction forces between track and magnetic suspension vehicle." Science and Transport Progress, no. 41 (August 25, 2012): 136–41. http://dx.doi.org/10.15802/stp2012/7881.

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In the article an analysis of interrelation of vertical and lateral interaction forces acting in the magnetic suspension system having permanent magnets of rectangular cross section with the constant (throughout the magnet volume) value of magnetization vector is performed. It is found that the increase in the magnetic bend width (for track and vehicle) leads to improving the lateral stability index as well as reducing the elevating power and the magnetic suspension efficiency.

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19

Planche, Thomas. "Constant-tune cyclotrons." Journal of Instrumentation 18, no. 03 (2023): P03019. http://dx.doi.org/10.1088/1748-0221/18/03/p03019.

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Abstract In this paper we demonstrate that cyclotrons can be made to have precisely constant betatron tunes over wide energy ranges. In particular, we show that the horizontal tune can be made constant and does not have to follow the Lorentz factor γ, while still perfectly satisfying the isochronous condition. To make this demonstration we developed a technique based on the calculation of the betatron tunes entirely from the geometry of realistic non-hard-edge closed orbits. We present two particular cyclotron designs, one compact cyclotron and one ring cyclotron. The compact cyclotron design

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20

Otsuka, A., and T. Kiyoshi. "High-Field Magnet Design Under Constant Hoop Stress." IEEE Transactions on Applied Superconductivity 18, no. 2 (2008): 1529–32. http://dx.doi.org/10.1109/tasc.2008.920531.

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21

Ma, Zhimin, and Xiaogang Qi. "Permanent magnet motor temperature compensated constant torque control." IFAC-PapersOnLine 51, no. 31 (2018): 68–70. http://dx.doi.org/10.1016/j.ifacol.2018.10.013.

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22

Wang, Chun Liu, Jin Jian Li, and Xiao Yun Feng. "Simulation of Permanent Magnet Synchronous Motor for Electric Vehicle Indirect-Torque Control System." Advanced Materials Research 383-390 (November 2011): 7438–43. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.7438.

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For the request of electric vehicle on drive motor, the permanent magnet synchronous motor (PMSM) get more and more attention by its small size and torque characteristics. By analyzing the traction motor characteristics with a constant torque starting and constant power operation, the space vector pulse width modulation (SVPWM) algorithm is used to replace the switching table for direct torque control (DTC) strategy. By analyzing the mathematical model of the PMSM, for the existence of permanent magnets, the rotor coordinate system is applied when calculating the stator flux. Meanwhile, the el

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23

Sarac, Vasilija Jovan, and Goce Stefanov. "Various Rotor Topologies of Line-Start Synchronous Motor for Efficiency Improvement." Power Electronics and Drives 5, no. 1 (2020): 83–95. http://dx.doi.org/10.2478/pead-2020-0006.

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Abstract Line-start synchronous permanent magnet motor (LSSPMM) is being considered as a replacement or alternative to asynchronous squirrel-cage motor (AM) in constant speed applications. This is due to the better efficiency and power factor than the asynchronous motor. There are various rotor topologies of LSSPMM concerning the magnets placement and their dimensions. The paper analyses six different rotor topologies in terms of achieving the best efficiency and power factor for the same output power of the motor with minimal consumption of permanent magnet material. All other motor design pa

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Capogna, A., O. Doche, and L. Davoust. "Near-wall MHD turbulence: investigation of a spanwise magnet array configuration." Magnetohydrodynamics 58, no. 4 (2022): 455–64. http://dx.doi.org/10.22364/mhd.58.4.9.

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Direct numerical simulations of turbulent channel flows subjected to non-uniform magnetic fields are presented. The magnetic fields are delivered by spanwise distributions of permanent magnets located on the top and bottom walls of the channel. This configuration generates mainly magnetic field components perpendicular and transverse to the wall. Three different values of magnet thickness are considered. For each calculation, the average magnetic intensity imposed in a selective part (\it{i.e.} the turbulent inner layer) of the channel is kept constant so that the only parameter studied is the

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Ren, Ya Heng, Ye Qing Zhu, and Cun Ming Hao. "The Speed and Position Control Method for Constant Magnetism Synchronous Motors Running at Low Speed." Applied Mechanics and Materials 303-306 (February 2013): 1217–23. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.1217.

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In the rotor field oriented vector control system, the use of permanent magnet synchronous motor voltage equations and flux equations derived PMSM position and speed estimation method has its unique advantages, The advantage of this approach is to calculate a simple, fast dynamic response, and easy to implement. However, when permanent magnet synchronous motor running at low speed, back EMF would be very small, which can not guarantee the accuracy of estimates. In addition, the position and speed estimation parameters of permanent magnet synchronous motor is largely in dependence on the runnin

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Kusumadewi, An-Nissa, Lisda Damayanti, Rukiah, and Risdiana. "Factors Affecting the Attractive Force of Dental Magnetic Attachment: A Literature Review for Guiding Dentists in Clinical Application." International Journal of Dentistry 2022 (June 14, 2022): 1–9. http://dx.doi.org/10.1155/2022/9711285.

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Aim. The aim of this review is to get a comprehensive description of the factors that may influence the attractive force of the dental magnetic attachment. Background. Dental magnetic attachment is a term for a magnet used as an overdenture retainer. Magnets that are widely used are permanent magnets such as neodymium iron boron (NdFeB) and samarium cobalt (SmCo). Theoretically, the magnetic attractive force in a permanent magnet has a constant retentive force, and the magnitude of the force will not decrease over time. However, several studies revealed that the magnetic attractive force can b

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Meyer, Alexander, and Jörg Franke. "Towards an Energy Efficient Series Production of High Performance Permanent Magnet Synchronous Motors by Selective Magnet Assembly." Applied Mechanics and Materials 882 (July 2018): 111–18. http://dx.doi.org/10.4028/www.scientific.net/amm.882.111.

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When installing magnets on synchronous rotors, the target values of energy efficiency, vibration, noise emissions, power density and synchronism are decisively influenced by the quality of the rotor magnetic field. This depends on the real position of the magnets after mounting, on the polarization of the magnet and on the direction of magnetisation. However, large component tolerances in the magnet bodies also require tolerances in the rotor magnetic field. The quality assurance in the field of rotor production, which is largely lacking in the current state of the art, is compensated for by r

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Crescent, Onyebuchi Omeje, and Ugwuoke Eya Candidus. "A comparative braking scheme in auto-electric drive systems with permanent magnet synchronous machine." International Journal of Applied Power Engineering 11, no. 4 (2022): 251~263. https://doi.org/10.11591/ijape.v11.i4.pp251-263.

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Permanent magnet synchronous machines (PMSMs) are gaining popularity due to renewable energy and the electrification of transportation. Permanent magnet synchronous machines are receiving interest because of their great dependability, low maintenance costs, and high-power density. This research compares surface mounted permanent magnet (SMPM) with interior permanent magnet (IPM) synchronous machines using MATLAB. Mathematical models and simulation analyses of two permanent magnet synchronous machines under regenerative braking are presented. Maximum regeneration power point (MRPP) and torque (

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Cinti, Luca, and Nicola Bianchi. "Hybrid-Excited PM Motor for Electric Vehicle." Energies 14, no. 4 (2021): 916. http://dx.doi.org/10.3390/en14040916.

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This paper deals with the potentials of a Hybrid-Excitation Permanent-Magnet (HEPM) machine. The HEPM machine is characterized by a rotor including both permanent magnets (PMs) and excitation coils. The PMs produce a constant flux at the air gap of the machine, while an excitation current is supplied so as to regulate such a flux. A flux increase could be necessary during transient overload operations, while a flux decrease is useful during Flux-Weakening (FW) actions to operate at speeds higher than the nominal speed. Torque, power, efficiency, flux density and losses of an interior permanent

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Диев, Д. Н., И. А. Ковалев, М. Н. Макаренко та ін. "Высокотемпературная сверхпроводниковая магнитная система для изучения нейронной активности". Журнал технической физики 92, № 2 (2022): 250. http://dx.doi.org/10.21883/jtf.2022.02.52014.147-21.

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The paper describes a high-temperature superconducting magnetic system (HTS SMS) to equip an experimental stand intended for neuron activity researches under constant and low-frequency magnetic fields up to 1 T. The design of the magnetic system together with its electromagnetic and cryogenic parameters is briefly discussed. The test results of the preliminary experiments conducted in liquid nitrogen at 77 K for two interchangeable magnets are given. The first magnet was manufactured in the form of a double pancake coil wound with 4 mm high HTS tape. The second magnet was made of pure copper w

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31

Gil, Jeonghwan, Sesun You, Youngwoo Lee, and Wonhee Kim. "Back Electro Motive Force Estimation Method for Cascade Proportional Integral Control in Permanent Magnet Synchronous Motors." Actuators 10, no. 12 (2021): 319. http://dx.doi.org/10.3390/act10120319.

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A cascade proportional integral control method with back-electro motive force compensation has been widely used for permanent magnet synchronous motors. In the permanent magnet synchronous motor control, it is important to accurately know the back-electro motive force constant for torque generation as well as back-electro motive force compensation. In this study, a real-time back-electro motive force constant estimation algorithm is developed to improve the velocity tracking control performance. The proposed method consists of a proportional integral controller and a back-electro motive force

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Zhumaev, M. R., M. Z. Sharipov, and M. N. Rizokulov. "Precession of magnetic moments with change of their orientations." Journal of Physics: Conference Series 2573, no. 1 (2023): 012032. http://dx.doi.org/10.1088/1742-6596/2573/1/012032.

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Abstract In the work the precession of the magnetization vector in nano-sized magnets is induced by a femtosecond laser pulse, the frequency of which lies in the transparency region of the magnet material. It is shown that an alternating magnetic field applied to the XOY plane generates the magnetic equilibrium position vectors and elliptical precession occurs if a constant magnetic field acts along the Z axis. In this case the precession angle changes periodically in time and the precession frequency is determined by the amplitude of the total magnetic field.

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Dziob, Daniel, Jakub Ramian, Jan Ramian, Bartosz Lisowski, and Jadwiga Laska. "Design and Construction of a Chamber Enabling the Observation of Living Cells in the Field of a Constant Magnetic Force." Cells 10, no. 12 (2021): 3339. http://dx.doi.org/10.3390/cells10123339.

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The aim of the work was to design and construct a microscopic stage that enables the observation of biological cells in a magnetic field with a constant magnetic force. Regarding the requirements for biological observations in the magnetic field, construction was based on the standard automatic stage of an optical microscope ZEISS Axio Observer, and the main challenge was to design a set of magnets which were the source of a field in which the magnetic force was constant in the observation zone. Another challenge was to design a magnet arrangement producing a weak magnetic field to manipulate

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Nishio, H. "Magnetic aftereffect constant of Nd-Fe-B sintered magnet." Journal of the Magnetics Society of Japan 13, no. 2 (1989): 209–12. http://dx.doi.org/10.3379/jmsjmag.13.209.

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Guo, Liang, and Hao Ding. "Design and Analysis of a Novel 2-D Permanent Magnet Array for Planar Actuator." Applied Mechanics and Materials 416-417 (September 2013): 253–57. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.253.

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A novel 2-D permanent magnet array for a planar actuator was proposed, in which the portion between adjacent magnetic poles was divided to four small rectangular solids. Magnetic fields of the permanent magnet array were analyzed systematically by 3D finite element method. The analysis results show that, compared with the well-known Halbach magnet array, the proposed array has higher permanent magnet utilization. Keeping the whole permanent magnet volume constant, the arrays with several improved structures were put forward. The magnetic field analyze results prove that the utilization is best

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Zhang, Huan Huan, Ke Bao Ye, and Guo Ping Yang. "Investigation of the Electric Vehicle Motor Constant Power Characteristics." Applied Mechanics and Materials 457-458 (October 2013): 688–91. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.688.

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The characteristics of traction motor for electric vehicle is introduced here. The qualitative analysis on the relation between the base speed ratio and power is showed. The emphasis is on the analysis and comparison for permanent magnet brushless DC motor, induction motor and switched reluctance motor.

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Ullah, Basharat, Faisal Khan, Muhammad Qasim, et al. "Lumped Parameter Model and Electromagnetic Performance Analysis of a Single-Sided Variable Flux Permanent Magnet Linear Machine." Energies 14, no. 17 (2021): 5494. http://dx.doi.org/10.3390/en14175494.

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A new Single-sided Variable Flux Permanent Magnet Linear Machine with flux bridge in mover core is proposed in this paper. The flux bridge prevents the leakage flux from the mover and converts it into flux linkage, which greatly influences the performance of the machine. First, a lumped parameter model is used to find the suitable coil combination and no-load flux linkage of the proposed machine, which greatly reduces the computational time and drive storage. Secondly, the proposed machine replaces the expensive rare earth permanent magnets with ferrite magnets and provides improved flux contr

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Ma, Der-Ming, and Jaw-Kuen Shiau. "THE DESIGN OF EDDY-CURRENT MAGNET BRAKES." Transactions of the Canadian Society for Mechanical Engineering 35, no. 1 (2011): 19–37. http://dx.doi.org/10.1139/tcsme-2011-0002.

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The eddy-current is created by the relative motion between a magnet and a metal (or alloy) conductor. The current induces the reverse magnetic field and results in the deceleration of motion. The proposed mechanism implements this phenomenon in developing a braking system. The potential applications of the braking system can be a decelerating system to increase the safety of an elevator or any guided rail transportation system. To provide scientific investigation for industrial application of magnetic braking, this study presents four systematic engineering design scenarios to design a braking

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Ahma, Muneeb, Lakshmikant Bopche, Virendra Umale, and Saurabh K. Singh. "Examination of Permanent Magnet Synchronous Motor." International Journal of Engineering and Advanced Technology 8, no. 6s (2019): 1095–100. http://dx.doi.org/10.35940/ijeat.f1214.0886s19.

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This paper focus on various loading conditions onthe Permanent Magnet Synchronous Motor and its application using field oriented control technique. Constant torqueapplication irrespective of speed isalso presented. This technique helps in lift and belt conveyors handling constant weight of material per unit time, in pumping and compressing and electric locos. Results of simulation shows that proposed system has high acceleration and deceleration rate with vector control,overall quick and dynamic response as well as excellent controlling ability. The vector control is a excellent technology for

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Goryca, Zbigniew, Kamil Paduszyński, and Artur Pakosz. "Model of the multipolar engine with decreased cogging torque by asymmetrical distribution of the magnets." Open Physics 16, no. 1 (2018): 42–45. http://dx.doi.org/10.1515/phys-2018-0008.

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Abstract This paper presents the results of field calculations of cogging torque for a 12-pole torque motor with an 18-slot stator. A constant angular velocity magnet and the same size gap between n-1 magnets were assumed. In these conditions, the effect of change of the n-th gap between magnets on the cogging torque was tested. Due to considerable length of the machine the calculations were performed using a 2D model. The n-th gap for which the cogging torque assumed the lowest value was evaluated. The cogging torque of the machine with symmetrical magnetic circuit (the same size of gap betwe

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A/L Krishna, Preshant, Aravind CV, Aminath Saadha, and F. Azhar. "Force Characteristics Analysis for Linear Machine with DC Field Excitations." MATEC Web of Conferences 152 (2018): 03005. http://dx.doi.org/10.1051/matecconf/201815203005.

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In urban regions and particularly in developing countries such as Malaysia with its ever-growing transport sector, there is the need for energy efficient systems. In urban railway systems there is a requirement of frequent braking and start/stop motion, and energy is lost during these processes. To improve the issues of the conventional braking systems, particularly in Japan, they have introduced linear induction motor techniques. The drawbacks of this method, however, is the use of permanent magnets, which not only increase the weight of the entire system but also increases magnetic cogging.

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Friedman, Benjamin M. C., Michael G. Abraham, Mark Paetkau, S. Richard Taylor, and Cynthia Ross Friedman. "Use of a varying turn-density coil (VTDC) to generate a constant-gradient magnetic field and to demonstrate the magnetic force on a permanent magnet." Canadian Journal of Physics 91, no. 3 (2013): 226–30. http://dx.doi.org/10.1139/cjp-2012-0405.

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In this study, we proposed that a constant gradient magnetic field could be generated by the construction of a current-carrying coil possessing a turn-density (number of turns per unit length) that varies linearly with axial position (i.e., a varying turn-density coil, VTDC). A VTDC is easily constructed and could be used to demonstrate how a ferromagnet placed in a magnetic field experiences a net force. Using the Biot–Savart law, we predicted that a ferromagnetic dipole suspended in a VTDC experiences a force proportional to the length of the dipole. We designed and executed an experiment to

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Omeje, Crescent Onyebuchi, and Candidus Ugwuoke Eya. "A comparative braking scheme in auto-electric drive systems with permanent magnet synchronous machine." International Journal of Applied Power Engineering (IJAPE) 11, no. 4 (2022): 251. http://dx.doi.org/10.11591/ijape.v11.i4.pp251-263.

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<span lang="EN-US">Permanent magnet synchronous machines (PMSMs) are gaining popularity due to renewable energy and the electrification of transportation. Permanent magnet synchronous machines are receiving interest because to their great dependability, low maintenance costs, and high-power density. This research compares surface mounted permanent magnet (SMPM) with interior permanent magnet (IPM) synchronous machines using MATLAB. Mathematical models and simulation analyses of two permanent magnet synchronous machines under regenerative braking are presented. Maximum regeneration power

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Diev D.N., Kovalev I.A., Makarenko M.N., et al. "High temperature superconducting magnetic system for neuron activity researches." Technical Physics 92, no. 2 (2022): 215. http://dx.doi.org/10.21883/tp.2022.02.52948.147-21.

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The paper describes a high-temperature superconducting magnetic system (HTS SMS) to equip an experimental stand intended for neuron activity researches under constant and low-frequency magnetic fields up to 1 T. The design of the magnetic system together with its electromagnetic and cryogenic parameters is briefly discussed. The test results of the preliminary experiments conducted in liquid nitrogen at 77 K for two interchangeable magnets are given. The first magnet was manufactured in the form of a double pancake coil wound with 4 mm high HTS tape. The second magnet was made of pure copper w

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Wang, Yi-Ren, and Po-Chuan Huang. "A Magneto-Electric Device for Fluid Pipelines with Vibration Damping and Vibration Energy Harvesting." Sensors 24, no. 16 (2024): 5334. http://dx.doi.org/10.3390/s24165334.

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This study introduces an innovative energy harvesting system designed for industrial applications such as fluid pipelines, air conditioning ducts, sewer systems, and subsea oil pipelines. The system integrates magneto-electric flow coupling and utilizes a dynamic vibration absorber (DVA) to mitigate the vibrations induced by fluid flow while simultaneously harvesting energy through magnetic dipole–dipole interactions in a vibration energy harvester (VEH). The theoretical models, based on Hamilton’s Principle and the Biot–Savart Law, were validated through comprehensive experiments. The results

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Darmawan, Isra' Nuur, Sahid Aktob Mudilulail, and Kholistianingsih Kholistianingsih. "Effect of Rotor Teeth Width Variations on Back EMF Constant of a 12-Slot 8-Pole Permanent Magnet Synchronous Generator: A Finite Element Analysis." Applied Engineering, Innovation, and Technology 1, no. 1 (2024): 23–30. http://dx.doi.org/10.62777/aeit.v1i1.10.

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Permanent Magnet Synchronous Generators (PMSGs) are widely used for converting mechanical energy into electrical energy through electromagnetic induction. Unlike conventional generators, PMSGs utilise permanent magnets to generate the excitation field, eliminating the need for external excitation coils. This study investigates the effects of rotor teeth width variations on the performance characteristics of a 12-slot, 8-pole PMSG using Finite Element Method (FEM) simulations. Specifically, the influence of rotor teeth width on flux density and back electromotive force (EMF) constant are explor

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Lee, Chih-Hao, Pai-Hsiang Cheng, Keh-Chyang Leou, Chih-Ming Hsieh, and Yu-Chuan Su. "Calculation of the Optimal Magnetic Duty Cycle for a Graded Coaxial Magnet of a Rotary Type Magnetic Refrigerator." Energies 18, no. 2 (2025): 289. https://doi.org/10.3390/en18020289.

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In the design of a rotary-type magnetic refrigerator, a high field of a coaxial magnet is desired. Typically, a high-field design can be achieved with a small duty cycle, which might not be optimized from the viewpoint of the thermal hydraulics of a magnetic refrigerator. In this work, a numerical simulation analysis of a graded coaxial magnet designed using a COMSOL program for a rotary-type active magnetic refrigeration (AMR) system was performed. The magnet structures are based on neodymium–iron–boron permanent magnets with thin gadolinium (Gd) and gadolinium-terbium alloy (Gd-Tb) plates as

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Bykov, Evgeny M. ""I/Magnet" Association: How Do People with Magnet Implants Signify Their New Experience." Sociology of power 35, no. 2 (2023): 62–85. https://doi.org/10.22394/2074-0492-2023-2-62-85.

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Based on self-reports of people with magnet implants, I investigate a pair of correlational questions: "How do technologically modified humans signify their new experience?" and "How do we, non-modified readers, become able to conceive it?". In answering the first question I start with biosemiotics. It considers signs being embedded in the morphology of an organism. On the one side, a magnet becomes a part of a human morphology and bodily schema; on the other - unlike most living organisms, humans can vary signs arbitrarily. I switch the theoretical exposition of the relation between signs, th

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Komine, Takashi. "Combinatorial dependence of magnetic printing characteristics in double magnet master media for energy-assisted magnetic recording." AIP Advances 13, no. 2 (2023): 025310. http://dx.doi.org/10.1063/9.0000480.

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In this study, the combinatorial dependence in double magnet master for energy-assisted magnetic recording was investigated by the micromagnetic framework. Four kinds of master media, which are soft single magnet (SSM), hard single magnet (HSM), soft double magnet (SDM) and hard double magnet (HDM), were compared. Comparing single magnet and double magnet master media, more adequate combination of double magnet master media was discussed. The HSM, SDM, and HDM master media can write line/space (L/S) pattern with bit length of 20 nm, while the double magnet master media can clearly print L/S pa

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Zhang, Longqi, Lei Zhao, and Shihao Li. "Analysis and Optimization Design of U-Shaped Ironless Permanent Magnet Linear Synchronous Motor." International Journal of Mechanical and Electrical Engineering 2, no. 2 (2024): 52–64. http://dx.doi.org/10.62051/ijmee.v2n2.08.

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The working speed of the U-shaped ironless permanent magnet linear synchronous motor is determined by the frequency and pole pitch. When the motor’s working speed is required to be constant, different combinations of frequency and pole pitch can be chosen. This article mainly discusses the influence of the pole pitch on the motor performance when other parameters are kept constant. First, the magnetic field of the motor permanent magnet is analyzed using the equivalent magnetizing current method to discuss the relationship between the pole pitch and the motor air gap magnetic field. Then, the

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