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Articoli di riviste sul tema "PERMANENT MAGNET BRUSHLESS"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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1

Panchal, T. H., A. N. Patel e R. M. Patel. "Reduction of cogging torque of radial flux permanent magnet brushless DC motor by magnet shifting technique". Electrical Engineering & Electromechanics, n. 3 (30 maggio 2022): 15–20. http://dx.doi.org/10.20998/2074-272x.2022.3.03.

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Introduction. In spite of many advantages of radial flux permanent magnet brushless DC motors it suffers from the distinct disadvantage of high cogging torque. The designer must emphasize to reduce the cogging torque during the design stage. This paper introduces magnet shifting technique to mitigate cogging torque of surface mounted radial flux brushless DC motor. Methodology. Initially 200 W, 1000 rpm surface mounted radial flux permanent magnet brushless DC motor is designed with symmetrical placement of permanent magnets with respect to each other on rotor core. Cogging torque profile of this initial motor is obtained by performing finite element modelling and analysis. Originality. This design has been improved by shifting the position of permanent magnets with respect to adjacent permanent magnets. The effect of magnet shifting on cogging torque has been analyzed by performing finite element analysis. Results. It has been examined that the peak to peak cogging torque is decreased from 1.1 N×m to 0.6 N×m with shifting of permanent magnets respectively.

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2

Chan, C. C., W. Xia, J. Z. Jiang, K. T. Chan e M. L. Zhu. "Permanent magnet brushless drives". IEEE Industry Applications Magazine 4, n. 6 (1998): 16–22. http://dx.doi.org/10.1109/2943.730754.

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3

Brakanskis, Uldis, Janis Dirba, Ludmila Kukjane e Viesturs Drava. "Analysis of a Permanent-Magnet Brushless DC Motor with Fixed Dimensions". Scientific Journal of Riga Technical University. Power and Electrical Engineering 26, n. 1 (1 gennaio 2010): 78–81. http://dx.doi.org/10.2478/v10144-010-0025-z.

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Analysis of a Permanent-Magnet Brushless DC Motor with Fixed DimensionsThe purpose of this paper is to describe the analysis of a permanent-magnet brushless DC motor with fixed outer diameter and active zone length. The influence of air gap, material of permanent magnets and their size on the magnetic flux density of the machine and magnetic flux is analyzed. The work presents the calculations of two programs, the comparison of the results and the most suitable combination of factors that has been found.

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4

Kaňuch, Ján, e Želmíra Ferková. "Design and simulation of disk stepper motor with permanent magnets". Archives of Electrical Engineering 62, n. 2 (1 giugno 2013): 281–88. http://dx.doi.org/10.2478/aee-2013-0022.

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Abstract In this paper the design and the magneto-static simulation of axial-flux permanent- magnet stepper motor with the disc type rotor is presented. Disk motors are particularly suitable for electrical vehicles, robots, valve control, pumps, centrifuges, fans, machine tools and manufacturing. The brushless machine with axial flux and permanent magnets, also called the disc-type machine, is an interesting alternative to its cylindrical radial flux counterpart due to the disk shape, compact construction and high torque density. This paper describes a design of four phase microstepping motor with the disc type rotor. The FEM modeling and the 3D magneto-static simulation of the disk stepper motor with permanent magnets is being subject of the article, too. Disc rotor type permanent magnet stepper motor for high torque to inertia ratio is ideal for robotics and CNC machines.

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5

Miller, Tim. "Brushless permanent-magnet motor drives". Power Engineering Journal 2, n. 1 (1988): 55. http://dx.doi.org/10.1049/pe:19880010.

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6

Nurmalia, Alif, Widyono Hadi e Widya Cahyadi. "Performance Test of Three-Phase Brushless Direct Current Motor Axial Flux with Differences Diameter of Neodymium Type Permanent Magnet". ELKHA 13, n. 1 (20 aprile 2021): 55. http://dx.doi.org/10.26418/elkha.v13i1.41693.

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Technology that is growing rapidly and innovations that have sprung up in the electrical field today are driving the use of electricity as a source of energy to do work. Electric motor is one component that is very popular in the industrial world and households that are useful to human life. In addition to DC motors and induction motors, there are also 3 phase brushless direct current (BLDC) motors which are a type of synchronous motor where magnetic fields are produced by rotor and stator at the same frequency. The rotor is a moving part of the brushless direct current motor which is a place of permanent magnet called a pole. This paper discusses the performance of brushless direct current 3 phase axial flux motors with different diameters of neodymium type permanent magnets. Tests carried out using neodymium permanent magnets with diameters of 15mm x 2mm and 20mm x 2mm were tested without using a load and using load. The parameters used in testing motor performance include speed, torque, and motor power with a source voltage of 12V, 16V, 20V, and 24V. The test results shows that the speed value of a BLDC motor using permanent magnets with a size of 20mm x 2mm is greater than that of permanent magnets of 15mm x 2mm. The same thing applies to the value of the power produced while, for the value of torque when the motor uses a permanent magnet of 15mm x 2mm will be greater than that of a motor using a permanent magnet of 20mm x 2mm.

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7

Dąbrowski, Mirosław, e Andrzej Rudeński. "Synthesis and CAD of permanent magnet DC brushless motors". Archives of Electrical Engineering 59, n. 1-2 (1 settembre 2010): 87–98. http://dx.doi.org/10.2478/s10171-010-0007-y.

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Synthesis and CAD of permanent magnet DC brushless motorsThe paper presents an algorithm and software for the optimal design of permanent magnet brushless DC motors. Such motors are powered by DC voltage sources via semiconductor switches connected to the motor phase belts. The software is adjusted to the design of motors with NdFeB high energy density magnets. An attention has been given to issues important in the design of the motors, i.e., permanent magnet selection, structure of magnetic circuit, and armature windings. Particularly, precision of calculation of the permanent magnet operating point, visualization of selection process of the winding belts, and magnetic circuit dimensioning have been investigated. The authors have been trying to make the equations more specific and accurate than those presented in the literature. The user software interface allows changes in the magnetic circuit dimensions, and in the winding parameters. It is possible to examine simultaneously the influence of these changes on the calculation results. The software operates both with standard and inverted (outer rotor) motor structure. To perform optimization, a non-deterministic method based on the evolution strategy (μ+λ) - ES has been used.

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8

Low, T. S., M. A. Jabbar e M. A. Rahman. "Permanent-magnet motors for brushless operation". IEEE Transactions on Industry Applications 26, n. 1 (1990): 124–29. http://dx.doi.org/10.1109/28.52683.

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9

Ede, J. D., K. Atallah e D. Howe. "Modular permanent magnet brushless servo motors". Journal of Applied Physics 93, n. 10 (15 maggio 2003): 8772–74. http://dx.doi.org/10.1063/1.1556984.

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10

Long, Ping, e Wei Xie. "Study on the Energizing Mode of Marine Seven-Phase Permanent Magnet Brushless DC Motor". Journal of Physics: Conference Series 2527, n. 1 (1 giugno 2023): 012036. http://dx.doi.org/10.1088/1742-6596/2527/1/012036.

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Abstract The permanent magnet brushless DC propulsion motor is highly efficient and energy-saving and can be widely used in the electric propulsion system of ships. Therefore, taking the marine seven-phase permanent magnet brushless DC propulsion motor as the main research object, the basic structure of the motor is analyzed, the states of the seven-phase conduction, six-phase conduction, and five-phase conduction modes are listed, and mathematical models of the three different conduction modes are studied. Finally, the current fluctuation of the six-phase conduction mode is smaller through simulation. The speed is more stable, and the advantages are greater, which provides a reference for the application of a seven-phase permanent magnet brushless DC propulsion motor in marine power.

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11

Wang, Shu Hong, Pan Wu e Li Mei Wang. "A Study on Overlapping Commutation Time in Permanent Magnet Brushless DC Motor". Applied Mechanics and Materials 143-144 (dicembre 2011): 114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.114.

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To determine the control method using overlapping commutation overlap time, this article on the four-phase permanent magnet brushless DC motor torque ripple based on the analysis of the use of overlapping commutation torque ripple suppression in the overlap time were derived by Ansoft software calculated four-phase permanent magnet brushless DC motor parameters, using MATLAB/Simulink software and simulate the model, simulation results were derived.

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12

Minh, D. B., V. D. Quoc e P. N. Huy. "Efficiency Improvement of Permanent Magnet BLDC Motors for Electric Vehicles". Engineering, Technology & Applied Science Research 11, n. 5 (12 ottobre 2021): 7615–18. http://dx.doi.org/10.48084/etasr.4367.

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A permanent magnet Brushless DC (BLDC) motor has been designed with different rotor configurations based on the arrangement of the permanent magnets. Rotor configurations strongly affect the torque and efficiency performance of permanent magnet electric motors. In this paper, different rotor configurations of the permanent magnet BLDC motor with parallel the Halbach array permanent magnet were compared and evaluated. Many applications of electric drives or air-crafts have recently preferred the surface-mounted permanent magnet design due to its ease of construction and maintenance. The finite element technique has been used for the analysis and comparison of different geometry parameters and rotor magnet configurations to improve efficiency and torque performance. A comprehensive design of a three-phase permanent magnet BLDC 35kW motor is presented and simulations were conducted to evaluate its design. The skewing rotor and Halbach magnet array are applied to the permanent surface-mounted magnet on the BLDC motor for eliminating torque ripples. In order to observe the skewing rotor effect, the rotor lamination layers were skewed with different angles and Halbach sinusoidal arrays. The determined skewing angle, the eliminated theoretically cogging torque, and the back electromotive force harmonics were also analyzed.

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13

Tang, Yu, Yong Xiang Xu e Wei Yan Liang. "Influence of Permanent Magnet Thickness on Loss of Permanent Magnet Brushless DC Motor". Advanced Materials Research 204-210 (febbraio 2011): 1797–800. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1797.

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The permanent magnet thickness is a main consideration for the permanent magnet brushless DC motor design. The effect of the magnet thickness on the different loss of the motor and motor output power is considered through the circuit-field coupling finite element method under the full-load operation. 2D transient thermal analysis is carried out as the verification of the design result. The motor is fabricated and the experimental results prove that the design motor with the certain magnet thickness can fulfill the requirements.

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14

Wu, Shasha, Baojian Wang, Tao Zhang e Quanhao Gu. "Design Optimization and Electromagnetic Performance Analysis of an Axial-Flux Permanent Magnet Brushless DC Motor with Unequal-Thickness Magnets". Applied Sciences 12, n. 15 (5 agosto 2022): 7863. http://dx.doi.org/10.3390/app12157863.

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To improve electromagnetic performance, an axial-flux permanent magnet brushless DC motor (AFPMBLDCM) with unequal-thickness arc permanent magnets is proposed in this paper. Firstly, the structure and magnetic circuit of the AFPMBLDCM with unequal-thickness arc permanent magnets were designed. Then, the mathematical models and design method of the main parameters were derived. According to the rated power and rated speed, the main parameters were further designed, and the analytical model was established by using Maxwell 3D. The air-gap flux density, back electromotive force (EMF) and torque under no-load and load conditions were calculated and analyzed to verify the validity of the model and design. Finally, based on a parameter scanning optimization method, the effects of the permanent magnet thickness, pole arc coefficient and permanent magnet radius on cogging torque were analyzed. The optimized parameters of the AFPMBLDCM with unequal-thickness arc permanent magnets were obtained. The results show that the sinusoidal degree of the air-gap magnetic field is improved, and the maximum torque ripple of the AFPMBLDCM is reduced to 2.92%.

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15

Fauzan Rhabbani, Muhammad, Ermanu Azizul Hakim e Nur Kasan. "Desain External Rotor IPM-V Motor Brushless DC Terhadap Torsi Cogging". Jurnal FORTECH 2, n. 1 (22 febbraio 2021): 16–25. http://dx.doi.org/10.32492/fortech.v2i1.235.

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Internal Permanent Magnet brushless DC motor is one of the various types of electric motors using permanent magnets that are inserted into the rotor's core without having to stick it like a permanent magnet motor mounted on the surface.This motor has better torque characteristics, high efficiency, and sturdy construction. But the consequences in the use of permanent magnets can’t be separated from the interaction between the permanent magnetic field mounted by the rotor with stator teeth. So that development is needed to obtain the results of better cogging torque and efficiency, such as variations in the external rotor IPM-V angular range of 80 °, 90 ° and 100 ° in 18 slots and 16 pole models which are simulated using the Infolytica Magnet application based on Finite Element Method (FEM), the data is processed using Microsoft Excel, so that the output will be a parameter in the Simulink MATLAB 2016a modeling to get the characteristics of the design motor. Variation testing on the motor is done at a speed of 2100 rpm. The results of the test show that the minimum cogging torque value in the angle model of the 90 ° magnetic range is 1.64 Nm with the highest efficiency of 80.6%. Smaller cogging torque values will reduce vibration or noise when the motor is spinning. The high value of efficiency indicates the losses that cause heating on the motor are smaller, so that the motor operating period becomes longer.

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16

Gilliam, J. E. "Brushless Permanent-Magnet and Reluctance Motor Drives". Power Engineering Journal 4, n. 1 (1990): 20. http://dx.doi.org/10.1049/pe:19900006.

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17

Rahman, M. A., e P. Zhou. "Analysis of brushless permanent magnet synchronous motors". IEEE Transactions on Industrial Electronics 43, n. 2 (aprile 1996): 256–67. http://dx.doi.org/10.1109/41.491349.

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18

Chunhua Liu, K. T. Chau, J. Z. Jiang e Shuangxia Niu. "Comparison of Stator-Permanent-Magnet Brushless Machines". IEEE Transactions on Magnetics 44, n. 11 (novembre 2008): 4405–8. http://dx.doi.org/10.1109/tmag.2008.2002632.

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19

Cheng, Ming, Wei Hua, Jianzhong Zhang e Wenxiang Zhao. "Overview of Stator-Permanent Magnet Brushless Machines". IEEE Transactions on Industrial Electronics 58, n. 11 (novembre 2011): 5087–101. http://dx.doi.org/10.1109/tie.2011.2123853.

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20

Shanshal, Abdullah, Khoa Hoang e Kais Atallah. "High-Performance Ferrite Permanent Magnet Brushless Machines". IEEE Transactions on Magnetics 55, n. 7 (luglio 2019): 1–4. http://dx.doi.org/10.1109/tmag.2019.2900561.

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21

Zhu, Z. Q., e J. T. Chen. "Advanced Flux-Switching Permanent Magnet Brushless Machines". IEEE Transactions on Magnetics 46, n. 6 (giugno 2010): 1447–53. http://dx.doi.org/10.1109/tmag.2010.2044481.

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22

Eriksson, Sandra. "Permanent Magnet Synchronous Machines". Energies 12, n. 14 (23 luglio 2019): 2830. http://dx.doi.org/10.3390/en12142830.

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Interest in permanent magnet synchronous machines (PMSMs) is continuously increasing worldwide, especially with the increased use of renewable energy and electrification of transports. This special issue contains the successful invited submissions of fifteen papers to a Special Issue of Energies on the subject area of “Permanent Magnet Synchronous Machines”. The focus is on permanent magnet synchronous machines and the electrical systems they are connected to. The presented work represents a wide range of areas. Studies of control systems, both for permanent magnet synchronous machines and for brushless DC motors, are presented and experimentally verified. Design studies of generators for wind power, wave power and hydro power are presented. Finite element method simulations and analytical design methods are used. The presented studies represent several of the different research fields on permanent magnet machines and electric drives.

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Sirewal, Ghulam Jawad, Muhammad Ayub e Byung-il Kwon. "Design and analysis of a PM-assisted brushless WRSM for improving torque characteristics". International Journal of Applied Electromagnetics and Mechanics 64, n. 1-4 (10 dicembre 2020): 1127–34. http://dx.doi.org/10.3233/jae-209429.

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This paper proposes a permanent magnet assisted brushless wound rotor synchronous machine (PMa–BL–WRSM) design. The proposed machine has the advantage of a high starting torque compared to existing BL–WRSM topologies. Additionally, the average torque increases and the torque ripple is reduced when the permanent magnet assisted machine structure is used. PMa–BL–WRSM operates on the principle of brushless excitation using zero-sequence, third-harmonic current generation in the stator windings. The third harmonic component is harnessed to induce a voltage in the harmonic winding which is mounted on the rotor. As there is no flux generated from filed winding in the starting, the starting torque of the machine is also zero. To overcome the problem, permanent magnets (PMs) are inserted in each field tooth to provide the initial source of flux on the rotor. Finite element analysis is performed with the PM–BL–WRSM, and the elicited results are compared with the basic machine structure. The proposed machine operation is verified using 2-D finite element analyses using the ANSYS Maxwell analysis tool.

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Wu, Shitao, Qingguang Chen, Qing Li, Xiangsheng Liu, Hailin Zhang e Li Lin. "Design of Aviation High Impedance Permanent Magnet Synchronous Generator". Mathematical Problems in Engineering 2021 (24 aprile 2021): 1–10. http://dx.doi.org/10.1155/2021/6667877.

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Permanent magnet generator is one of the key components of a three-stage electrically excited brushless synchronous motor, with a main function to provide excitation power for the main exciter and driving power for the controller. In order to improve the reliability and safety of the operation of the three-stage electrically excited brushless synchronous motor, the permanent magnet generator is required to provide sufficient power under all operating conditions and to have low short-circuit current when its own short-circuit fault occurs, so that the generator will not be burnt out due to overheating. Thus, power characteristic and high impedance characteristic are the key goals of designing a permanent magnet generator. In this paper, the fractional slot concentrated winding was adopted to calculate and analyze the electromagnetic properties of permanent magnet generators with different rotor structures, and the optimal design was obtained. A prototype was manufactured to conduct related experiments on the electromagnetic properties. The results demonstrated that the experimental data are basically consistent with the simulation data, and the permanent magnet generator can meet the design requirements for power and high impedance characteristics, with a high power density.

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Hu, Wenjing, Xueyi Zhang, Huihui Geng, Ting Gao, Liwei Shi e Di You. "Electromagnetic Design and Flux Regulation Analysis of New Hybrid Excitation Generator for Electric Vehicle Range Extender". Journal of Electrical and Computer Engineering 2021 (26 marzo 2021): 1–13. http://dx.doi.org/10.1155/2021/5547517.

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Aiming at the problem of uncontrollable magnetic field of permanent magnet generators, a new hybrid excitation generator (HEG) with parallel magnetic circuit is proposed. The HEG consists of combined permanent magnet rotor (PMR) and brushless electric excitation rotor (EER). The PMR has surface-mounted and embedded magnets. The PMR provides the main air gap field, and the brushless EER is used to adjust the air gap field. The operating principle and electromagnetic design scheme of the proposed generator are given in detail. Besides, the matching with two different types of rotors and the flux regulation characteristics is analyzed by using the finite element method. Finally, the output performance of the proposed generator including no-load and load characteristics and output voltage are tested. The results show that the two different types of rotors can be matched efficiently and operated reliably. The internal magnetic flux is easy to adjust in both directions, and the proposed HEG can output stable voltage in the range of wide speed and load.

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Jinrui, Fan, Li Hong, Ding Yongjie, Yu Daren e Li Dong. "Research on Transient Electromagnetic Field Model of High Speed Permanent Magnet Brushless DC Motor Based on the Theory of Constant Electromagnetic Field". Journal of Computational and Theoretical Nanoscience 13, n. 10 (1 ottobre 2016): 6539–48. http://dx.doi.org/10.1166/jctn.2016.5599.

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The development of ultra-high speed motor is the development direction of the information industry in the future, and it is also the important guarantee for the production efficiency. Objective: To study the working model of the electromagnetic field of the permanent magnet brushless DC motor in the condition of constant electromagnetic field. Methods: Based on the theory of constant electromagnetic field, the model of a high speed permanent magnet brushless DC motor is derived. Process: Combined magnetic circuit calculation method and finite element method of electromagnetic field, and then use the mathematical model to calculate the electromagnetic. Finally, by using the model simulation to verify its practicability. Conclusion: The inhibiting effect of the ring structure rotor pole and cogging torque ripple can meet the requirements of high-speed motor mechanical and electromagnetic performance, meanwhile, the motor has a good performance in this way. So, it can provide reference for the construction of the transient electromagnetic field model of high speed permanent magnet brushless DC motor in the future.

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Jiao, Hai Ning, Xi Ping Liu e Jie Yang. "Design of Controller of Permanent Magnet Brushless DC Motor for Electric Vehicle". Advanced Materials Research 986-987 (luglio 2014): 1063–66. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1063.

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In view of the defects of the electric car driver motor technology, considering actual needs of the car running, relaxing the electrical power density and the limitation of the moment of inertia etc, focusing on the reliability, speed range and high efficient operation area of the motor, based on the analysis of permanent magnet brushless dc motor operation principle, this paper designed a low cost, high intelligent electric car permanent magnet brushless dc motor controller. Through the analysis, simulation, experiment and comparison, the results show that the control system has good dynamic response and steady state properties.

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Ohnishi, Kazuo. "Cogging Torque Reduction in Permanent Magnet Brushless Motors". IEEJ Transactions on Industry Applications 122, n. 4 (2002): 338–45. http://dx.doi.org/10.1541/ieejias.122.338.

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Ede, Jason D., Kais Atallah e David Howe. "Design variants of modular permanent magnet brushless machine". Journal of Applied Physics 91, n. 10 (2002): 6973. http://dx.doi.org/10.1063/1.1452669.

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Li, Xiaokun, Song Wang, XiaoFan Wang e Tingting Shi. "Permanent magnet brushless motor control based on ADRC". MATEC Web of Conferences 40 (2016): 08003. http://dx.doi.org/10.1051/matecconf/20164008003.

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Stone, D. A., P. H. Mellor, D. Howe e K. Atallah. "Rotor loss in permanent-magnet brushless AC machines". IEEE Transactions on Industry Applications 36, n. 6 (2000): 1612–18. http://dx.doi.org/10.1109/28.887213.

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Atallah, Kais, e Jiabin Wang. "A Brushless Permanent Magnet Machine With Integrated Differential". IEEE Transactions on Magnetics 47, n. 10 (ottobre 2011): 4246–49. http://dx.doi.org/10.1109/tmag.2011.2157897.

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Moehle, Nicholas, e Stephen Boyd. "Optimal current waveforms for brushless permanent magnet motors". International Journal of Control 88, n. 7 (aprile 2015): 1389–99. http://dx.doi.org/10.1080/00207179.2015.1012558.

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Singh, Bhim. "Recent advances in permanent magnet brushless DC motors". Sadhana 22, n. 6 (dicembre 1997): 837–53. http://dx.doi.org/10.1007/bf02745848.

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Kiyoumarsi, Arash. "Prediction of Torque Pulsations in Brushless Permanent-Magnet Motors Using Improved Analytical Technique". Journal of Electrical Engineering 61, n. 1 (1 gennaio 2010): 37–43. http://dx.doi.org/10.2478/v10187-010-0005-8.

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Prediction of Torque Pulsations in Brushless Permanent-Magnet Motors Using Improved Analytical TechniqueTorque pulsations have prominent effects on the performance of brushless permanent- magnet (PM) machines. There are different sources of torque ripples in PM motors. These torque pulsations depend on the shape of the flux density distribution in the airgap region. For predicting the open-circuit airgap field distribution in brushless PM motors, a two dimensional (2-D) analytical method, in which the direction of magnetization, either radial or parallel and the effect of the stator slot-openings are taken into account, is used. The method uses an improved 2-D permeance model. In order to evaluate the accuracy of this method, a 2-D time-stepping FEM coupled with the two motion equations is used. A 3-phase, 36-slot, 4-pole, 5 HP, brushless PM motor is modeled by two methods. In this analysis both, the radial and parallel magnetization of the brushless motor are considered. The results obtained by the analytical method are compared with those obtained by FE analysis that shows the valuable accuracy of the analytical method for performance calculations in design and optimization processes.

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CRAIU, Ovidiu, Leonard Marius MELCESCU e Cristian BOBOC. "Brushless DC Permanent Magnet Motors State of the Art". Electrotehnica, Electronica, Automatica 69, n. 4 (15 novembre 2021): 5–16. http://dx.doi.org/10.46904/eea.21.69.4.1108001.

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The paper presents a study of the permanent magnet brushless DC machine, from two perspectives - from authors’ own experience in designing and manufacturing such motors, as well as from actual published research. Various constructive topologies and how they influence BLDC operation, windings used with emphasis on slot, concentrated windings, are also presented. The following part describes current techniques used for enhancing BLDC limited maximum speed, such as phase advance and dwell control, somewhat similar to flux weakening in AC permanent magnet brushless motors. The paper concludes with presentation of several methods used for sensing BLDC rotor position. Overall, the authors’ intention publishing this paper was to provide an insight regarding current BLDC development, as well as to assist in making documented choices when using BLDC in specific applications.

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Yang Shen e Z. Q. Zhu. "Investigation of Permanent Magnet Brushless Machines Having Unequal-Magnet Height Pole". IEEE Transactions on Magnetics 48, n. 12 (dicembre 2012): 4815–30. http://dx.doi.org/10.1109/tmag.2012.2202398.

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Ebadi, Fatemeh, Mohammad Mardaneh e Akbar Rahideh. "Inductance analytical calculations of brushless surface-mounted permanent-magnet machines based on energy method". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, n. 2 (4 marzo 2019): 536–56. http://dx.doi.org/10.1108/compel-04-2018-0198.

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Purpose This paper aims to show the proposed energy method for inductance calculation is valid for any number of poles, phases and any winding layout. Design/methodology/approach A two-dimensional (2-D) analytical energy-based approach is presented to calculate self-inductances and mutual inductances of brushless surface-mounted permanent-magnet machines. Findings The proposed calculation procedure is valid for brushless permanent-magnet machines with slotted or slotless stator structure. Comparisons between energy method and flux linkage method are presented based on simulation and experimental results. It shows that the energy method has an excellent agreement with the result obtained from finite element method (FEM) and experimental study. Originality/value This paper compares energy-based method with flux linkage method and FEM for inductance calculations in slotless and slotted permanent-magnet motors. The relations for inductance calculation are presented which are obtained based on 2-D analytical representation of magnetic field.

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39

Wu, Shasha, Hao Xu, Tao Zhang, Quanhao Gu e Baojian Wang. "Multi-Objective Optimization of an Axial Flux Permanent Magnet Brushless DC Motor with Arc-Shaped Magnets". Applied Sciences 12, n. 22 (16 novembre 2022): 11641. http://dx.doi.org/10.3390/app122211641.

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To get a better electromagnetic performance of an axial flux permanent magnet brushless DC motor (AFPMBLDC), an AFPMBLDC with arc-shaped magnets and its multi-objective optimization design are researched. Firstly, the main design parameters of the AFPMBLDC are proposed, and the initial designs are carried out according to the given requirements. Furthermore, the pole arc coefficient, permanent magnet thickness, permanent magnet arc radius, and air-gap length are selected as optimization factors. Then, an orthogonal experiment table is established, in which the flux density, no-load back EMF, harmonic distortion rate, and output torque ripple are selected as optimization targets. The Taguchi optimization method is adopted to optimize the performance indexes and the optimal parameters are obtained. Finally, the optimized model is constructed, and some simulations are carried out to verify the optimal design. The research results have shown that the air-gap flux density of the optimized AFPMBLDC is reduced to 31.8%, the total harmonic distortion rate of no-load back EMF is less than 7.5%, and the torque ripple is reduced to 4.3%.

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40

AFANASYEV, Alexandr A., Valeriy S. GENIN, Vladimir A. VATKIN e Dmitriy A. TOKMAKOV. "Magnetic Vibrations of a Brushless Permanent Magnet Motor's Stator Core". Elektrichestvo, n. 2 (2022): 56–64. http://dx.doi.org/10.24160/0013-5380-2022-2-56-64.

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The radial and tangential tensions causing force effects on the stator core are considered as applied to a 150 kW brushless permanent magnet motor. The orders of tension waves, their displacement velocities, and the frequencies of forced force actions are analyzed. The electromagnetic torques of tangential tensions are investigated. It is shown that with non-sinusoidal excitation of the rotor, same-order higher harmonics of the magnetic induction from the rotor magnets and stator currents cause high-frequency electromagnetic torques. Three resonant frequencies of the stator core at radial magnetic forces are calculated. The stator core radial displacement amplitudes and vibration velocities were determined, which have been found to be close to experimental data. An experimental frequency response of the motor casing noise for its idle operation mode is obtained. Comments regarding the sources of noise bursts occurring at a number of frequencies are given. The influence of insufficiently suppressed high-frequency reactive torque (the "walking" torque) on the motor noise is pointed out. It is shown that the presence of a residual reactive torque with an amplitude measured from experiment leads to a rather high burst of motor casing noise at a frequency of 3500 Hz.

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41

Zhu, Cai Hong, e Hong Tao Zhang. "Magnet Field Finite Element Analysis of Permanent Magnet Brushless DC Motors Based on ANSOFT". Advanced Materials Research 904 (marzo 2014): 504–7. http://dx.doi.org/10.4028/www.scientific.net/amr.904.504.

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Abstract (sommario):

2D whole field finite element method (FEM) based on ANSOFT software was adapted, and the magnetic field distribution of permanent-magnet brushless DC motor (BLDC) were calculated. The above discussion can provide reliable theory foundation for the reasonable establishment of nonlinear model BLDC and the further exploitation and application.

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42

Ishikawa, Takeo, Kouki Yonetake, Nobuyuki Kurita e Masahisa Tsuchiya. "Estimation of Magnetization Distribution in Permanent Magnet of Brushless DC Motor". Materials Science Forum 670 (dicembre 2010): 360–68. http://dx.doi.org/10.4028/www.scientific.net/msf.670.360.

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This paper proposes a method to estimate the magnetization distribution in permanent magnet of a Brushless DC motor when the excitation voltage of a magnetizer is changed. First, we show from the experimental results that there is an optimal excitation voltage to reduce the cogging torque of the motor. Next, we show that it is possible to estimate the magnetization distribution in the permanent magnet by using the measured flux density distribution and cogging torque.

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43

Dini, Pierpaolo, e Sergio Saponara. "Cogging Torque Reduction in Brushless Motors by a Nonlinear Control Technique". Energies 12, n. 11 (11 giugno 2019): 2224. http://dx.doi.org/10.3390/en12112224.

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This work addresses the problem of mitigating the effects of the cogging torque in permanent magnet synchronous motors, particularly brushless motors, which is a main issue in precision electric drive applications. In this work, a method for mitigating the effects of the cogging torque is proposed, based on the use of a nonlinear automatic control technique known as feedback linearization that is ideal for underactuated dynamic systems. The aim of this work is to present an alternative to classic solutions based on the physical modification of the electrical machine to try to suppress the natural interaction between the permanent magnets and the teeth of the stator slots. Such modifications of electric machines are often expensive because they require customized procedures, while the proposed method does not require any modification of the electric drive. With respect to other algorithmic-based solutions for cogging torque reduction, the proposed control technique is scalable to different motor parameters, deterministic, and robust, and hence easy to use and verify for safety-critical applications. As an application case example, the work reports the reduction of the oscillations for the angular position control of a permanent magnet synchronous motor vs. classic PI (proportional-integrative) cascaded control. Moreover, the proposed algorithm is suitable to be implemented in low-cost embedded control units.

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44

Korkosz, Mariusz, Bartłomiej Pakla e Jan Prokop. "Frequency Analysis of Partial Short-Circuit Fault in BLDC Motors with Combined Star-Delta Winding". Energies 15, n. 1 (28 dicembre 2021): 196. http://dx.doi.org/10.3390/en15010196.

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Abstract (sommario):

This paper analyses the condition of a partial short-circuit in a brushless permanent magnet motor. Additionally, the problem was analysed for three stator winding configurations: star, delta and star-delta connection. The paper presents an original mathematical model allowing a winding configurations to be analysed. What is more, the said mathematical model allows taking account of the partial short-circuit condition. Frequency analysis (Fast Fourier Transform—FFT) of the artificial neutral point voltage was proposed for the purpose of detecting the partial short-circuit condition. It was demonstrated that a partial short-circuit causes a marked increase in the diagnostic frequencies of the voltage signal. The proposed brushless permanent magnet motor diagnostic method is able to detect the fault regardless of the stator winding configuration type.

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45

Yildirim, M., H. Kurum, D. Miljavec e S. Corovic. "Influence of Material and Geometrical Properties of Permanent Magnets on Cogging Torque of BLDC". Engineering, Technology & Applied Science Research 8, n. 2 (19 aprile 2018): 2656–62. http://dx.doi.org/10.48084/etasr.1725.

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Abstract (sommario):

Aim of this study is to investigate the influence of both material and geometrical properties of surface mounted permanent magnets (PM) on cogging torque of a brushless DC motor (BLDC) by means of numerical modeling based on finite element method (FEM). To this end, a 2D numerical model of the BLDC motor is built by using the software package Ansys Maxwell. In this study, we analyze the machine properties in no excitation mode (i.e. no stator current is applied) and calculate the distribution of magnetic flux density within the entire motor, the magnetic flux density in the air gap, the cogging torque and the back electromotor force (EMF). Firstly, analysis is performed for four different magnets. It is seen that while cogging torque, back EMF, and magnetic flux density in the air gap for the strongest magnet material have the highest values, the lowest values of these are obtained for the weakest magnet. In the second part of the study, the effect of variation of magnet geometry on the cogging torque, magnetic field density and back EMF of BLDC is examined. Three magnet embrace values are handled in this study. When the magnet embrace increases, the value of the cogging torque reduces. Besides, the maximum values of the back EMF are approximately the same for different magnet embraces, while shapes of the back EMF only change based on the magnet embrace. According to the results, the cogging torque strongly depends on the material and geometrical properties of the magnets.

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46

Anuja, T. A., e M. Arun Noyal Doss. "Reduction of Cogging Torque in Surface Mounted Permanent Magnet Brushless DC Motor by Adapting Rotor Magnetic Displacement". Energies 14, n. 10 (15 maggio 2021): 2861. http://dx.doi.org/10.3390/en14102861.

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Abstract (sommario):

Cogging torque is a critical dilemma in Permanent Magnet Brushless DC (PMBLDC) motors. In medium-low power PMBLDC motors, redundant vibrations and forbidding noises arise as a result of the harmonic magnetic forces created by cogging torque. This paper introduces a simple approach for minimizing cogging torque in PMBLDC motors by applying placement irregularities in rotor magnets. An angle shift in the rotor magnets in surface-mounted PMBLDC motors helps to attain magnet displacement. This displacement imparts an asymmetrical magnet structure to the rotor. Maintaining pole arc to pole pitch ratio (L/τ) of between 0.6 and 0.8, shifting angles from 1° to 8° were considered in order to analyze the effect of the angle shift on the rotor magnets. An analytical expression was also derived for finding the shifting angle with the minimum cogging torque in the PMBLDC motor by using the Virtual Work Method (VWM). The optimization of the shifting angle with minimum cogging torque was investigated using 3D Finite Element Analysis (FEA). A comparison of the simulation and analytical results of cogging torque was carried out. It was determined that the reduction of cogging torque in the analytical results showed good agreement with the FEA analysis.

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47

Zhu, Chuanhui, Rujie Lu, Congli Mei, Tao Peng e Guoqin Zhang. "Design and Simulation Analysis of Stator Slots for Small Power Permanent Magnet Brushless DC Motors". International Transactions on Electrical Energy Systems 2023 (16 febbraio 2023): 1–19. http://dx.doi.org/10.1155/2023/1152243.

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Abstract (sommario):

With the development of power electronics technology, permanent magnet brushless DC motors have developed rapidly and are now widely used in electric vehicles, flywheel energy storage, rail transit, and other applications. The stator slot structure is one of the main factors affecting the performance of the motor. A low-power permanent magnet brushless DC motor was selected as the research object, and the finite element analysis method was used to study the effects of different slot and pole combinations and stator slot types on the cogging torque, reluctance torque, and back electromotive force of the permanent magnet brushless DC motor. The influence of the stator slot structure of the motor on the performance of the motor was analyzed, and the optimal slot-pole combination and stator slot type were determined. The results showed that the cogging torque of the 2-stage 24-slot motor was 14 mN·m, and the reluctance torque was 75 mN·m. The cogging torque and reluctance torque were the smallest, and the back electromotive force waveform was similar to a trapezoidal wave. The motor cogging torque of the pear-shaped round slot was the smallest, with a value of 460 mN·m, and the motor reluctance torque of the pear-shaped trapezoidal slot was the smallest, with a value of 1.2 N·m. The back electromotive force waveforms of the motors with four different stator slot types were similar.

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48

Neethu, S., K. S. Shinoy e A. S. Shajilal. "Efficiency Improvement of an Axial Flux Permanent Magnet Brushless DC Motor for LVAD Application". Applied Mechanics and Materials 110-116 (ottobre 2011): 4661–68. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.4661.

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This paper presents the Finite Element Analysis (FEA) based design, optimization and development of an axial flux permanent magnet brushless DC motor for Left Ventricular Assist Device (LVAD). With the design objective of improving the existing motor's efficiency , different topologies of AFPM machine has been examined. Selection of optimal magnet frac-tion, Halbach arrangement of rotor magnets and the use of Soft Magnetic Composite (SMC) material for the stator core results in a novel motor with improved efficiency and torque profile. The results of the 3D Finite element analysis for the novel motor have been shown.Thermal analysis for the existing motor has also been done and the FEA results are compared with the analytical and experimental results.Finally the test results for the novel motor and the general conclusions are also discussed.

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49

Luo, Hong-hao, Jun Wu e Wen-Sen Chang. "Minimizing Thrust Fluctuation in Moving-Magnet Permanent-Magnet Brushless Linear DC Motors". IEEE Transactions on Magnetics 43, n. 5 (maggio 2007): 1968–72. http://dx.doi.org/10.1109/tmag.2007.892081.

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50

Farooq, J. A., A. Djerdir e A. Miraoui. "Analytical Modeling Approach to Detect Magnet Defects in Permanent-Magnet Brushless Motors". IEEE Transactions on Magnetics 44, n. 12 (dicembre 2008): 4599–604. http://dx.doi.org/10.1109/tmag.2008.2001751.

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