Journal articles: 'Permanent magnet motors'

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Chang, Sungwoo, Noboru Niguchi, Je-Hoon Lee, and Katsuhiro Hirata. "Improvement of Torque Performance and Energy Density of PM-Type Vernier Motor Utilizing Saddle Coil and Salient Pole." Applied Sciences 11, no. 6 (March 22, 2021): 2818. http://dx.doi.org/10.3390/app11062818.

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In electric motors, the use of rare-earth magnets has been increasing rapidly. A stronger magnet force of the magnet enables the motor’s higher performance, resulting in the most high-performance motors generally using rare-earth magnets. However, these magnets have two crucial disadvantages: the potential restrictions on the supply of rare-earth magnetic materials and the sharp fluctuation in price. Thus, many recent researches focus on developing high-performance electric motors and reducing the use of critical rare-earth magnets. By increasing the torque density of the motor, we can reduce the use of permanent magnets. Focusing on this point, and we presented a double half permanent magnet (DHPM)-type vernier motor. This paper proposed a new saddle coil permanent magnet vernier motor with improved performance compared to its predecessor. The main feature of the proposed motor is that the permanent magnet and coil in the stator of a DHPM-type vernier motor is replaced by salient poles and saddle coils, respectively. We also investigate its characteristics through various simulations.

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Kaňuch, Ján, and Želmíra Ferková. "Design and simulation of disk stepper motor with permanent magnets." Archives of Electrical Engineering 62, no. 2 (June 1, 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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Bui, Minh Dinh, Duc Hung Bui, Viet Linh Trieu, and Quoc Vuong Dang. "Improved Torque and Efficiency of Induction Motors by Changing Rotor Structure of Permanent Magnet Assistance Synchronous Reluctance Motors." Journal of Technical Education Science, no. 71A (August 30, 2022): 1–7. http://dx.doi.org/10.54644/jte.71a.2022.1145.

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Many authors have recently studied line start permanent magnet assistance synchronous reluctance. This paper presents a method to improve the electromagnetic torque and efficiency of induction motors of 7.5kW-4P (which consists of 36 stator slots and 40 rotor bars) by changing the design of the permanent magnet assistance synchronous reluctance rotors. This means that permanent magnets will be inserted to the squirrel cage induction motors (induction motors). The electromagnetic torque and efficiency of an induction motor is analyzed and compared with that of the line-start synchronous reluctance motor via a finite element analysis. In addition, the influence of position and length permanent magnets on the electromagnetic torque and efficiency of the line-start synchronous reluctance motor is also considered and simulated. The model of this motor Linh is finally designed with four U layered- magnet rotor to verify the developed method. The development of the method is also validated on the practical induction motor.

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Safin, Alfred, and Timur Petrov. "Topological optimization of the rotors of permanent magnet synchronous motors." E3S Web of Conferences 220 (2020): 01040. http://dx.doi.org/10.1051/e3sconf/202022001040.

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Permanent magnet synchronous motors are increasingly used in the oil industry. These motors need to be made more energy efficient. To do this, it is necessary to optimize the rotor of a synchronous motor by changing the design through topological optimization. Designing an electrical machine as a heuristic process does not guarantee finding the best solution. Methods are needed that complement the experience and intuition of the designer to find the optimal (rational) solution. Topological optimization is currently performed using the finite element method to reduce mass and improve the stiffness of structures. The proposed method allows you to transfer topological optimization to electromagnetic processes in permanent magnet synchronous motors to determine the direction of magnetization and the size of permanent magnets, for a given mass-dimensional parameters. Optimization of the rotor of a serial permanent magnet motor based on a genetic algorithm is proposed. A new topology of the rotor of the motor was calculated and an increase in the torque was obtained by 18.2%, which indicates that topological optimization is promising for synchronous motors with permanent magnets.

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Do, NY, TA Le, and XC Ngo. "Effect of Permanent Magnet Structure on The Performance of LSPMSM with a Power of 22 kW and 3000 rpm." IOP Conference Series: Earth and Environmental Science 1111, no. 1 (December 1, 2022): 012047. http://dx.doi.org/10.1088/1755-1315/1111/1/012047.

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Abstract Energy efficiency and sustainability are important goals for countries all over the world. With the advancement of material technology, many new generations of high-efficiency motors are being researched and developed to replace induction motors (IM) to save energy. Line-start permanent-magnet synchronous motors (LSPMSM) are high-performance and ultra-high-performance motors that are emerging as an alternative to squirrel-rotor induction motors. Constructing the permanent magnets in the rotor is critically important in ensuring LSPMSM performance. The study uses the finite element method to analyze the characteristics of the motor. The study presented the influence of the permanent magnet structure in the rotor of the LSPMSM with a power of 22 kW and a speed of 3000 rpm on the electromagnetic field distribution in the motor, as well as the motor’s working characteristics to optimize the permanent magnet structure to optimize the performance of the LSPMSM. The analysis results show that the proposed LSPMSM has a 92.6% higher efficiency than the same-type induction motor. This is a suitable replacement for high-power and high-speed IM, which contributes to energy efficiency, so using fewer fossil fuels to reduce environmental impact is a sustainable development solution.

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Nurmalia, Alif, Widyono Hadi, and Widya Cahyadi. "Performance Test of Three-Phase Brushless Direct Current Motor Axial Flux with Differences Diameter of Neodymium Type Permanent Magnet." ELKHA 13, no. 1 (April 20, 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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Manh, Tien Ho, Dinh Bui Minh, Tu Pham Minh, and Vuong Dang Quoc. "Investigation of the Influence of Skewed Slots and Degmagnetization Effects to Line Start Permanent Magnet Assistance Synchronous Reluctance Motors." Engineering, Technology & Applied Science Research 13, no. 1 (February 1, 2023): 9807–11. http://dx.doi.org/10.48084/etasr.5307.

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A permanent magnet assistance synchronous reluctance motor can start directly with a net voltage or a power converter via a torque control method. However, this motor has usually a higher irreversible demagnetization level in comparison with interior permanent magnet motors, due to the fewer permanent magnets in rotor slots. In order to cope with this disadvantage, different arrangements of permanent magnets in the rotor of the line-start permanent magnet assistance synchronous reluctance motor are proposed in this paper. The V magnet shape taking skewed slots and demagnetization effect into account with the short circuit current are investigated by the finite element approach. The efficiency, torque, and output power of the proposed model have been also improved. Finally, the rotor with 3V layered magnets is prototyped to verify the efficiency of the proposed motor.

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Minh, D. B., V. D. Quoc, and P. N. Huy. "Efficiency Improvement of Permanent Magnet BLDC Motors for Electric Vehicles." Engineering, Technology & Applied Science Research 11, no. 5 (October 12, 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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Bi, Qing, and Dingguo Shao. "Loss Analysis of High-Speed Permanent Magnet Motor for Cordless Vacuum Cleaner." Journal of Physics: Conference Series 2488, no. 1 (May 1, 2023): 012021. http://dx.doi.org/10.1088/1742-6596/2488/1/012021.

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Abstract Compared with traditional permanent magnet motors, high-speed permanent magnet motors (HSPMM) have the advantages of fast dynamic response, high efficiency, high reliability, small size, etc. Therefore, HSPMM has been widely used in household and industrial fields, and the research on high-speed permanent magnet motors has become a hot spot in the motor industry. In this paper, the high-speed permanent magnet motor is applied to the cordless vacuum cleaner, and the calculation and analysis of the iron loss and copper loss of the high-speed permanent magnet motor are emphatically studied for the HSPMM used in the cordless vacuum cleaner.

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Panchal, T. H., A. N. Patel, and R. M. Patel. "Reduction of cogging torque of radial flux permanent magnet brushless DC motor by magnet shifting technique." Electrical Engineering & Electromechanics, no. 3 (May 30, 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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Dąbrowski, Mirosław, and Andrzej Rudeński. "Synthesis and CAD of permanent magnet DC brushless motors." Archives of Electrical Engineering 59, no. 1-2 (September 1, 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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Cheng, Ming, Rui Wu Cao, Wei Hua, and Xin Wang. "A New Linear Double Salient Permanent Magnet Motor with Complementary Winding." Applied Mechanics and Materials 416-417 (September 2013): 115–20. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.115.

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In this paper, two novel structures of linear double salient permanent magnet (LDSPM) motor having magnets and armature windings in primary are proposed and compared. Firstly, the design principles of both motors are presented. Then, for a fair comparison, two motors are designed based on the same primary dimensions including the slot area, teeth number, pole pitch, permanent magnet volumes and coils number per phase, while the stator pole pitch and the primary structure are different. Finally, the configurations and static characteristics of both motors are critically compared based on finite element (FE) analysis. The results indicate that the proposed topology can avoid the asymmetry of back-EMF waveforms and reduce cogging force and thrust force ripple. Also, the proposed primary permanent magnet linear motors are suitable for the longer stator application such as urban rail transit (URT).

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An, Yue Jun, Wen Qiang Zhao, Li Ping Xue, Hong Liang Wen, and Guo Ming Liu. "The Method of Pole Width Modulation Reducing Cogging Torque in Permanent Magnet Motor." Advanced Materials Research 383-390 (November 2011): 1369–75. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1369.

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Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.

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An, Yue Jun, Wen Qiang Zhao, Li Ping Xue, Hong Liang Wen, and Guo Ming Liu. "The Method Pole of Width Modulation Reducing Cogging Torque in Permanent Magnet Motor." Advanced Materials Research 433-440 (January 2012): 4201–6. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.4201.

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Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.

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Basenko, V. R., T. I. Petrov, and A. R. Ibragimova. "Creating a computer model of a synchronous motor for the implementation of the project «Creation of a series of electric motors with a modernized rotor for electric transport of low power»." Power engineering: research, equipment, technology 26, no. 2 (June 3, 2024): 46–54. http://dx.doi.org/10.30724/1998-9903-2024-26-2-46-54.

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RELEVANCE. The challenges of creating modern permanent magnet synchronous motors require solving technical problems in conjunction with economic realities. Due to the use of permanent magnets in the construction of synchronous motors, their cost limits their industrial application. Therefore, there is an urgent issue of optimizing the design of synchronous motors, which can be solved by changing the topology.TARGET. The goal is to create more economical permanent magnet synchronous motors (PMSMs) in low-power electric vehicles. It is planned to implement a new method for constructing PMSM. This solution will reduce weight and size parameters and increase specific power, which are important indicators for electric transport.METHODS. To modernize modern synchronous motors, a complex topological optimization method based on a genetic algorithm is proposed.RESULTS. A computer model was obtained in the form of calculation of electromagnetic fields in the stator and rotor of a synchronous motor with permanent magnets.CONCLUSION. Modeling the parameters of synchronous motors with permanent magnets has a low degree of development in the domestic mechanical engineering due to the lack of developed infrastructure in the field of low-power electric transport; the creation of domestic developments in this area is of a strategic nature.

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Sarac, Vasilija. "Performance analysis of various rotor topologies of surface PM synchronous motor." Journal of Electrical Engineering 74, no. 2 (April 1, 2023): 85–94. http://dx.doi.org/10.2478/jee-2023-0011.

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Abstract Surface mounted permanent magnet synchronous motors can be found in several designs regarding configuration of magnets on the rotor. Finding the most optimal design in terms of the high efficiency and power factor, small cogging torque and material consumption along with good overloading capability could be a challenging task. This paper analyzes three different rotor designs of surface permanent magnet motors regarding their magnet shapes. All three motors have the same outer dimensions, output power, torque and the material properties. The comparison of all three models is performed and advantages and drawbacks of each model are pointed out. Four design variables are selected to be varied within prescribed limits for each motor model in order the best combination of number of conductors per slot, magnet thickness, the magnet length and shape to be fond, which result with the highest efficiency, small cogging torque and good overloading capability of the motor. The impact of each varied parameter on motor efficiency and cogging torque is presented. All three optimized model are compared and the most optimal model in terms of the above-mentioned characteristics is analyzed by finite element method (FEM) and with the Simulink. The model in Simulink allows motor transient characteristics to be obtained. The performed analysis is useful for determining the most optimal and cost-effective solution among presented three types of surface mounted permanent magnet motors in terms of the high efficiency and power factor, small cogging torque and material consumption.

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Zhang, Hao Ming, Hong Li, and Lian Soon Peh. "Research of Halbach Array’s Influence on Permanent Magnet Synchronous Motor’s Performance." Applied Mechanics and Materials 651-653 (September 2014): 808–11. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.808.

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The present motors are required to high speed, high efficiency, high power density but low pulsating torque. Traditonal rare-earth permanent magnet motor shows its defect; Halbach Array is a new type of permanent magnet structure: magnet field presents unilateral with the sinusoidal distribution. The structure makes the magnetic density of motor’s air gap larger relatively while the magnetic density of rotor’s yoke smaller. And it can help to reduce the motor’s pulsating torque and its size, as well as to raise the power density of motor. The result of finite element analysis based on ANSYS shows that the above structure is able to decrease the mass of motor, to widen the width of air gap and obviously to improve the multi properties of motors.

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Li, Junxiang, Ziang Li, Jian Zhang, Shuyuan Zhao, Feitian Cheng, Chuan Qian, Xingyu Hu, and Guoxiang Zhou. "Automated Monitoring of the Uniform Demagnetization Faults in Permanent-Magnet Synchronous Motors: Practical Methods and Challenges." Sustainability 15, no. 23 (November 27, 2023): 16326. http://dx.doi.org/10.3390/su152316326.

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Due to its high power, high efficiency, low pollution, and compact size, permanent-magnet synchronous motors (PMSMs) have been widely used in a variety of fields, including electric vehicles, aerospace, wind turbines, and marine devices, which are used in renewable, sustainable, and environmentally friendly energy resources. However, in these practical scenarios, the motor operating conditions are complex and variable. Under high-temperature and high-current conditions, PMSMs may experience demagnetization failures, not only leading to performance degradation but also inducing unexpected failures of the motors. To reduce the risk of unexpected losses caused by demagnetization faults and improve the safety and reliability of motor systems, it is necessary to apply automated monitoring of the magnet flux of the motor’s permanent magnets and achieve real-time diagnosis of early demagnetization faults, ensuring the safe operation of the motor. This review article tries to summarize the current detection methods of the automated monitoring of demagnetization faults in PMSMs. The main online monitoring technologies from both practical and academic perspectives are summarized and their benefits and challenges are reviewed. Finally, the research trends and suggestions for future improvements are provided. This review article not only sheds light on the origins of the automated monitoring of demagnetization faults but also helps to design highly effective and sustainable permanent-magnet synchronous motors.

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Beniakar, Minos E., Athanasios G. Sarigiannidis, Panagiotis E. Kakosimos, and Antonios G. Kladas. "Evolutionary Optimization of a Fractional Slot Interior Permanent Magnet Motor for a Small Electric Bus." Materials Science Forum 792 (August 2014): 373–78. http://dx.doi.org/10.4028/www.scientific.net/msf.792.373.

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Fractional Slot Concentrated Winding (FSCW) Interior Permanent Magnet (IPM) motors constitute a favorable choice for electric vehicle applications due to their inherent advantages of high efficiency and performance, field weakening capability and permanent magnet effective shielding from eddy currents. In this paper, an IPM motor with buried sinusoidal magnets for a small electric bus is optimized in terms of both efficiency and performance. The overall magnet volume and the corresponding iron bridge width are maintained within specified borders, thus enabling adequate field weakening and permanent magnet shielding margins. In the optimization process a single-objective Differential Evolution (DE) algorithm is utilized, showing great convergence characteristics.

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Donsión, M. P. "Permanent magnet synchronous motors." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 27, no. 4 (July 11, 2008): 946–57. http://dx.doi.org/10.1108/03321640810878379.

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Swierczynski, Karol, Maciej Antal, Marcin Habrych, and Bartosz Brusilowicz. "A new approach to design line start permanent magnet synchronous motors." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 3 (June 1, 2023): 2508. http://dx.doi.org/10.11591/ijece.v13i3.pp2508-2516.

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<span lang="EN-US">The article describes a new approach to line start permanent magnet synchronous motors (LSPMSM) design process. This different, novel approach is based on the modification of mass-produced induction motors. The presented method facilitates and expedites the electrical motor design process. A field-circuit model of the motor has been created to expound the methodology of the process. Then, the machine's geometry was changed to apply permanent magnets. The problems and benefits associated with the use of permanent magnets were described. The created model was tested. The authors examined the operation of the LSPMSM motor in different states, such as starting, no-load, and blocked-rotor tests. Electromechanical characteristics have been plotted. The simulation results were compared with the parameters and characteristics of the induction motor. The conducted tests proved the correctness of the design process. The operational properties of the motor have been improved. Moreover, the validity of using LSPMSM motors instead of induction motors has also been demonstrated.</span>

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Xin, Yuanxu, and Xudong Wang. "Time constant analysis of micromotors for virtual reality helmets." Journal of Physics: Conference Series 2378, no. 1 (December 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 the micro permanent magnet claw-pole stepper motor in basic theory. Different specifications of micro permanent magnet claw-pole stepper motors were used to obtain some relationships between time constant and motor performance, which provided reference for the design and control research of micro permanent-magnet claw-pole stepper motors.

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Et.al, Ravisankar B. "Analysis and Prediction of Cogging Torque and ripples in output Torque of Permanent Magnet Synchronous Motor and Line Start Permanent Magnet Synchronous Motor." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (April 10, 2021): 4586–95. http://dx.doi.org/10.17762/turcomat.v12i3.1851.

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Permanent magnet (PM) motors are rapidly replacing the squirrel cage induction motors for its energy efficient operation, smooth control and high power density. Although PM Motors are energy efficient, they are inherently affected by cogging torque and torque ripple. Magnetic alignment between teeth of stator and permanent magnet of rotors produce cogging torque. Torque ripple is a dynamic oscillation during steady-steady operation which leads to various mechanical anomalies like vibration, noise and rotor stress. Torque ripple is produced in PM motors because of non-sinusoidal distribution of flux, saturation, improper selection of slots etc., these ill effects will deteriorate the starting and steady-state performance of motors. So it is very vital to make analysis and prediction of cogging torque and torque ripples to make the motor more effective. Now a day's minimizing the torque ripples and cogging torque are gaining importance in PM motor designs. In this proposed work, the cogging torque analysis and torque ripple analysis of permanent magnet motor and line start permanent magnet motor has been done and reported.

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Cvetkovski, Goga Vladimir, and Lidija Petkovska. "Selected Nature-Inspired Algorithms in Function of PM Synchronous Motor Cogging Torque Minimisation." Power Electronics and Drives 6, no. 1 (January 1, 2021): 204–17. http://dx.doi.org/10.2478/pead-2021-0012.

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Abstract Both permanent magnet brushless DC motors and permanent magnet synchronous motors have attracted wide attention and are increasingly used in industrial high-performance applications in recent years. Those motors are known for their good electrical, magnetic and performance characteristics, but there is one parameter known as cogging torque that has a negative influence on the performance characteristics of the motor. This pulsating torque is generated as a result of the interaction between the stator teeth and the permanent magnets. The minimisation of the ripple of this torque in those permanent magnet motors is of great importance and is generally achieved by a special motor design which in the design process involves a variety of many geometrical motor parameters. In this research work, a novel approach will be introduced where two different nature-inspired algorithms, such as genetic algorithm (GA) and cuckoo search (CS) algorithm are used as an optimisation tool, in which the defined equation for the maximum value of the cogging torque is applied as an objective function. Therefore, a proper mathematical presentation of the maximum value of the cogging torque for the analysed synchronous motor is developed and implemented in the research work. For a detailed analysis of the three different motor models, the initial motor and the two optimised motor models are modelled and analysed using a finite element method approach. The cogging torque is analytically and numerically calculated and the results for all the models are presented.

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Li, Zheng-Feng, Lin-Wei Huang, Shih-Gang Chen, Yu-Tse Hsu, Jun-Ming Hsu, and Ming-Shi Huang. "Analytical Approach for Estimating the Average Torque of Synchronous Motors by Using the Flux Density in the Air Gap." Energies 16, no. 23 (November 28, 2023): 7832. http://dx.doi.org/10.3390/en16237832.

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In this study, a generalized torque estimation method is proposed for synchronous motors, including surface permanent magnet synchronous motors (SPMSMs), synchronous reluctance motors (SynRMs), and interior permanent magnet synchronous motors (IPMSMs) for building the analytical motor model. The average motor torque is estimated using the Lorentz force by the generated flux density in the air gap to determine the relationships among torque, flux density, and injected current. In the proposed method, the generated flux density is derived step by step by considering the effects of magnetic flux saturation, the stator slot, the rotor barrier, and permanent magnets (PMs) to ensure that the generated average torque complies with the operating condition of the motor. To verify the proposed method, the output torque of finite element analysis (FEA), Maxwell 2D, is compared to the proposed method in a SPMSM. Moreover, a phasor diagram is plotted to determine the mechanism through which torque is generated in SynRMs and IPMSMs. A SynRM and an IPMSM with ferrites PMs are analyzed using the proposed method, FEA, and the experimental results of this study indicate the effectiveness.

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DING, XIAOFENG, and CHRIS MI. "MODELING OF EDDY CURRENT LOSS AND TEMPERATURE OF THE MAGNETS IN PERMANENT MAGNET MACHINES." Journal of Circuits, Systems and Computers 20, no. 07 (November 2011): 1287–301. http://dx.doi.org/10.1142/s021812661100789x.

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The eddy current loss in the magnets of permanent magnet (PM) motors in a hybrid electric vehicle (HEV) and plug-in HEV is usually not taken into consideration in traditional motor design and analysis. However, due to the high conductivity of the rare-earth magnet, neodymium-iron-boron (NdFeB), and slot/tooth harmonics, there is eddy current loss generated inside the magnets. This loss may not attribute very much to the efficiency of the motor, but the temperature-rise inside the magnets caused by this loss can lead to the unpredictable deterioration of the magnets, such as the degradation of performance and potential demagnetization. In addition, the output voltage of pulse-width-modulated (PWM) inverter contains abundant high frequency harmonics, which induce excessive loss in the magnets. The excessive heat in PM motor induced by the eddy current loss combined with other losses can degrade the performance of the machine. This paper presents the modeling and analysis of eddy current loss in surface-mounted-magnets PM synchronous motors (SPMSM) and interior-magnets PM synchronous motors (IPMSM), operated by PWM inverter supply. Analytical methods are implemented, in conjunction with time-stepped finite-element analysis (FEA) for the calculation of eddy current loss in the magnet. Based on the calculated losses in the machines, simplified analytical models are developed as thermal circuits with network of interconnected nodes, thermal resistances and heat sources representing the heat processes within the SPMSM and IPMSM, to predict the temperature of the magnets. The predicted machine temperatures are found to be consistent with the experimental measurement.

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Sarac, Vasilija. "Performance optimization of permanent magnet synchronous motor by cogging torque reduction." Journal of Electrical Engineering 70, no. 3 (June 1, 2019): 218–26. http://dx.doi.org/10.2478/jee-2019-0030.

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Abstract The development of the robotics and the automation and the need for the motors that can work in the applications that require high speed, precision and increased efficiency have led to the increased use of permanent magnet synchronous motors and their continuous development in terms of improving their performance. Cogging torque is one of the features of these types of the motors that deteriorate motor performance especially at low speeds. Therefore, in this paper the method of genetic algorithms (GA) is applied as an optimization tool, for minimizing the cogging torque without changing the other important operating parameters like output power, torque or current. Even more, the optimized motor model has improved efficiency compared to the starting model and has the decreased weight of the permanent magnets. The optimization is done by changing the rotor design in terms of the magnet thickness, pole span and shape of the magnets. Finite elements (FE) models of the optimized and the basic motor were derived and from them the flux density distribution in the motor cross section and in the air gap was calculated. In addition, the improvement of the motor operation is observed from the torque characteristics calculated by the FE models.

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Glinka, Tadeusz, and Jakub Bernatt. "Asynchronous slip-ring motor synchronized with permanent magnets." Archives of Electrical Engineering 66, no. 1 (March 1, 2017): 199–206. http://dx.doi.org/10.1515/aee-2017-0015.

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Abstract The electric LSPMSM motor presented in the paper differs from standard induction motor by rotor design. The insulated start-up winding is located in slots along the rotor circumference. The winding ends are connected to the slip-rings. The rotor core contains permanent magnets. The electromechanical characteristics for synchronous operation were calculated, as were the start-up characteristics for operation with a short-circuited rotor winding. Two model motors were used for the calculations, the V-shaped Permanent Magnet (VPM) – Fig. 3, and the Linear Permanent Magnet (IPM) – Fig. 4, both rated at 14.5 kW. The advantages of the investigated motor are demonstrated in the conclusions.

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Abdalla, Izzeldin Idris, Taib Ibrahim, and Nursyarizal Mohd Nor. "Analysis of a Tubular Linear Permanent Magnet Motor for Reciprocating Compressor Applications." Applied Mechanics and Materials 448-453 (October 2013): 2114–19. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2114.

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This paper describes a design optimization to achieve optimal performance of a two novel single-phase short-stroke tubular linear permanent magnet motors (TLPMMs) with rectangular and trapezoidal permanent magnets (PMs) structures. The motors equipped with a quasi-Halbach magnetized moving-magnet armature and slotted stator with a single-slot carrying a single coil. The motors have been developed for reciprocating compressor applications such as household refrigerators. It is observed that the TLPMM efficiency can be optimized with respect to the leading design parameters (dimensional ratios). Furthermore, the influence of mover back iron is investigated and the loss of the motor is computed. Finite element analysis (FEA) is employed for the optimization, and the optimal values of the ratio of the axial length of the radially magnetized magnets to the pole pitch as well as the ratio of the PMs outer radius-to-stator outer radius (split ratio), are identified.

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Ferdyanto, Ferdyanto, Gumilang Fatwa, Augusta Erlangga, and Idris Marbawi. "Performance Analysis of Permanent Magnet BLDC Motor for Reducing Cogging Torque Using Taguchi Method." ELKHA 16, no. 1 (April 26, 2024): 28. http://dx.doi.org/10.26418/elkha.v16i1.76582.

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An electric motor is an electromagnetic machine commonly utilized across various industries and automotive products. One prevalent type of electric motor employed in electric vehicles is the Permanent Magnet Brushless DC Motor (PM-BLDC), a brushless motor employing permanent magnets. However, despite its efficiency, permanent magnet motors often experience vibrations that can disrupt their performance. This research aims to optimize the existing BLDC motor design, with a specific focus on reducing the existing cogging torque. Initially, the existing design exhibited a cogging torque level of 0.21482 Nm. The optimization process involved modifications to several key design parameters, such as air gap, magnet thickness, magnet type, and slot opening width. In previous research, only comparisons were made between stator slot designs, which proved to be less effective as significant differences were not evident in the results of the comparative analysis of BLDC motor designs. So, in this research, the Taguchi method was utilized for the optimization process due to several advantages it offers. Through an analysis of means and variance, the optimization process successfully achieved a significant reduction in cogging torque by 0.099744 and an increase in efficiency by 0.6%. The results of the optimized permanent magnet BLDC design indicated a cogging torque value of 0.115072 Nm and an efficiency of 86.64% at an operational motor speed of 1500 rpm. This research provides a substantial contribution to the development of more efficient electric motors suitable for various applications.

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Chen, Shijun, Qi Zhang, Surong Huang, and Jianwen Guo. "Multiphysical-Domain Integration Design of Oil-Cooled Permanent Magnet ISG Motor." Mathematical Problems in Engineering 2020 (February 29, 2020): 1–10. http://dx.doi.org/10.1155/2020/2818403.

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Integrated-starter-generator (ISG) motors are a key part of new-energy vehicle dynamic systems. To more efficiently design higher-performance permanent magnet ISG motors, we proposed a multiphysical-domain integrated design method by designing the electromagnetism and thermal performance of motors and the mechanical structure strength of rotors together. A 48-slot and 8-pole oil-cooled permanent magnet ISG motor was designed by using this method and simulated via the finite element method. Also, a motor-testing platform was built to experimentally validate this method. The simulation results were consistent with the test results, which confirmed that the new method was accurate and effective and can be referred to during the practical design and development of high-density permanent magnet motors.

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Anuja, T. A., and M. Arun Noyal Doss. "Reduction of Cogging Torque in Surface Mounted Permanent Magnet Brushless DC Motor by Adapting Rotor Magnetic Displacement." Energies 14, no. 10 (May 15, 2021): 2861. http://dx.doi.org/10.3390/en14102861.

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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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Lee, Christopher, Matthew Angle, Krishan Bhalla, Mohammad Qasim, Jie Mei, Sajjad Mohammadi, K. Iyer, Jasmin Sinkular, and James Kirtley. "Quantitative Comparison of Vernier Permanent-Magnet Motors with Interior Permanent-Magnet Motor for Hybrid Electric Vehicles." Energies 11, no. 10 (September 24, 2018): 2546. http://dx.doi.org/10.3390/en11102546.

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In this paper, three Vernier permanent-magnet (VPM) motor, namely the inner-rotor VPM (IR-VPM) motor, the outer-rotor VPM (OR-VPM) motor and the OR consequent-pole VPM (OR-CP-VPM) motor are proposed for the hybrid electric vehicle (HEV) applications. Owing to employment of toroidal-winding arrangement, the OR-VPM and the OR-CP-VPM motors can enjoy better material utilization and easier manufacturing process than its IR-VPM counterpart. Meanwhile the OR-CP-VPM motor can utilize the consequent-pole topology to minimize flux leakage that exists in conventional design. With the support of finite element method (FEM), the motor performances among the VPM motors and the profound interior permanent-magnet (IPM) motor can be compared quantitatively.

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Manikandan, C. T., G. T. Sundarrajan, V. Gokula Krishnan, and Isaac Ofori. "Performance Analysis of Two-Loop Interleaved Boost Converter Fed PMDC-Motor System Using FLC." Mathematical Problems in Engineering 2022 (August 1, 2022): 1–12. http://dx.doi.org/10.1155/2022/1639262.

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Nowadays, the Permanent Magnet DC (PMDC) motors are intended to achieve the maneuver with elevated exactness and accurateness. To elevate the exactness and accurateness of the Permanent Magnet DC motors, the two-loop Interleaved Boost Converter (ILBC) is intended to control methods. The projected Converter is located between DC load and Permanent Magnet DC motor loads. The united construction of Permanent Magnet DC motors and Interleaved Boost Converter may be miscarried owing to steady state error, speed disparity, and slow response. To condense the difficulties, the Fuzzy Logic Controller is intended in the recommended Converter and Permanent Magnet DC motor. This exertion enlightened the modelling, simulation, and relevance of the Interleaved Boost Converter with Permanent Magnet DC motor (ILBC-PMDCM). The recommended technique chief objective aims at upholding the mandatory DC voltage from the input supply voltage with the assistance of Fuzzy Logic Controller. Current mode Fuzzy Logic Controller is proposed in the present work. The objective is to improve small-scale stability of ILBC-PMDCM system. The recommended controller is functioning based on closed-loop alignment. The projected FL controller is simulated and equated with the Proportional Integral (PI) controller in Permanent Magnet DC motor. From the investigation, the projected controller presents the finest outcomes than the Proportional Integral controller. The projected controller has altered benefits such as declined steady state error and enriched time domain response. The hardware outcomes of the projected controller are also presented, which are evaluated against the simulation outcomes.

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Gao, Bo, Yuan Cheng, Tianxu Zhao, Haodong Sun, and Shumei Cui. "A Review on Analysis Methods and Research Status of Hysteresis Motor." Energies 16, no. 15 (July 31, 2023): 5715. http://dx.doi.org/10.3390/en16155715.

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A hysteresis motor produces output torque through the hysteresis effect of magnetic materials. It has the advantages of a simple structure, high-speed operation, high temperature resistance, low noise and self-starting capability. It can be applied to some special occasions requiring high speed and high stationarity. However, its disadvantage is low torque density, low efficiency and low power factor. The permanent magnet hysteresis motor is a compromise of the characteristics of permanent magnet motor and hysteresis motor, and it can be self-starting in the case of having a torque density comparable to that of a permanent magnet motor. In addition, there are some new structures of hysteresis motors, which open up the direction for innovative applications. Due to the complexity of magnetic properties, the calculation methods and dynamic models of hysteresis motors and permanent magnet hysteresis motors are special and also depend on the research of hysteresis materials and hysteresis models. This paper starts from the principle and classification of the hysteresis motor, and different structures and the corresponding analysis methods are reviewed. The motors with new structures and new methods are emphasized, the innovation and contribution of existing research are summarized, and the development trend of hysteresis motors is described.

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Et.al, Ho-Joon Lee. "A Study on The Fully Enclosed Housing Of Interior Permanent Magnet Synchronous Motor." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 6 (April 10, 2021): 687–91. http://dx.doi.org/10.17762/turcomat.v12i6.2071.

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Approximately 2.5 billion won can be saved every year by replacing existing induction motors, which are traction motors for urban railway vehicles, with permanent magnet motors. This paper presents a study on the structural design of a completely enclosed motor to commercialize an interior permanent-magnet synchronous motor (IPMSM) for the traction of urban railway vehicles. The proposed solution provides protection from an inflow of dust and magnetic powder into the rotor that can deteriorate the motor performance and cause burnout. In addition, unless it is a water-cooled or oil-cooled structure, cooling of an electric motor used in medium and large-sized equipment is not easily accomplished. However, completely enclosed motors are vulnerable to overheating; therefore, research into housing design is required to provide cooling. Additionally, the permissible current density through the stator winding must be considered in the design to prevent the occurrence of thermal demagnetization of permanent magnets. Furthermore, IPMSMs require a separate driver for operation and speed controls for a wide range of operating conditions such as rail traction. Thus, a study has been conducted on IPMSMs and other related driver and control technologies, and their suitability has been validated through performance tests.

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Si, J. K., M. Si, and Hai Chao Feng. "Research on the Field of New Type Rotor Structure Permanent Magnet Synchronous Motors." Applied Mechanics and Materials 143-144 (December 2011): 154–58. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.154.

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For each characteristic of surface-mounted permanent magnet motor and built-in permanent magnet motor, this paper presents a new rotor hybrid topologies structure of both the permanent magnet motors. Surface Mounted, built-in and hybrid permanent magnet motor topology model were established using the finite element method for to calculate the static magnetic field three structures of the motor. Comparative analysis of their contour distribution of the pole from the amplitude distribution within the air gap flux density and the flux density of the cloud were done. Air-gap magnetic field distribution in permanent magnet motor proposed new structure is more close to the sine, which is basis on the motor design, operation and so on.

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Gholamian, Seyed Asghar, and Hamid Reza Gholinejad. "A DIFFERENT APPROACH IN OPTIMUM DESIGN PROCESS AND FEA VALIDATION OF LOW-SPEED MULTI-PHASE IPMSMS." IIUM Engineering Journal 18, no. 1 (May 30, 2017): 133–45. http://dx.doi.org/10.31436/iiumej.v18i1.687.

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Magnets placement effects on permanent magnet motors performance, because of its different magnetic flux density distribution. Therefore, different types of magnet placement should be examined experimentally or by valid simulations. In this paper, first, an interior permanent magnet synchronous motor (IPMSM) called spoke type with specifications related to the propulsion of ships is designed and then optimized by ant colony algorithm to increase the torque-to-volume ratio. The design procedure and its formulas presented as simple as possible. Then, to verify the optimization results of the optimized motor, a Two-dimensional finite element analysis (FEA) is done. Also in this analyze the core and the slot saturation was studied.

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Bianchini, Claudio, Ambra Torreggiani, Matteo Davoli, and Alberto Bellini. "Design of Low-Cost Synchronous Machine to Prevent Demagnetization." Energies 13, no. 14 (July 10, 2020): 3566. http://dx.doi.org/10.3390/en13143566.

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The request for high efficiency motor paves the way for the replacement of induction motors with permanent magnet synchronous motors. Although the efficiency is increased, for medium and high power, the current ripple causes significant additional losses in the magnet and lamination; and, high temperature can lead to demagnetization. In this paper, a new rotor topology is proposed and compared to a traditional surface permanent magnet rotor to reduce the magnet losses and protect them from demagnetization. A reference surface permanent magnet machine is compared with the proposed one in terms of performance and magnet losses. Both analytical and experimental analysis are carried out and discussed.

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Dinh Hai Linh. "Torque imporvement of IPM motors with skewing magnetic designs." Journal of Military Science and Technology, no. 76 (December 12, 2021): 3–10. http://dx.doi.org/10.54939/1859-1043.j.mst.76.2021.3-10.

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In this paper, a type interior permanent magnet synchronous motor designs is proposed for sport scooter application to improve constant torque wide speed performance. Interior Permanent Magnet machines are widely used in automotive applications for their wide-speed range operation and low maintenance cost. An existing permanent magnet motor (commercial QS Motor) is 3 kW-3000 rpm. In order to improve torque and power in wide speed range, a IPM electric motor 5.5 kW -5000 rpm can run up to 100 km/h: An Step-Skewing Interior Permanent Magnet motor alternatives is designed and optimized in detail with optimal magnetic segment V shape. The electromagnetic charateristics of Interior Permanent Magnet motors with V shape are compared with the reference Surface Permanent Magnet motor for the same geometry parameter requirements. Detailed loss and efficiency result is also analyzed at rate and maximum speeds. A prototype motor is manufactured, and initial experimental tests are performed. Detailed comparison between Finite Element Analysis and test data are also presented. It is shown that it is possible to have an optimized Interior Permanent Magnet motor for such high-speed traction application. This paper will figure out optimal angle of magnetic V shape for maximum torque and minimum torque ripple.

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Dong, Ting, Xingkang Dong, and Xuepeng Wei. "Thrust analysis of permanent magnet linear synchronous motor with oriented silicon steel." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (December 10, 2020): 1515–22. http://dx.doi.org/10.3233/jae-209472.

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Thrust performance is one of the important indexes of permanent magnet linear synchronous motors. The traditional non-oriented silicon steel sheet is used as the core material of the permanent magnet linear synchronous motor, which limits the performance of the permanent magnet linear synchronous motors. For the oriented silicon steel sheet has a higher magnetic permeability in the rolling direction, a permanent magnet linear synchronous motor with similar number of poles and slots made of oriented silicon steel is proposed in this paper. By measuring the B-H curves of the rolling direction and the cutting direction, the thrust properties of the two motors made of traditional silicon steel sheets and oriented silicon steel sheets are analyzed and compared by the finite element method (FEM) under rated load and overload conditions respectively. The thrusts under different tooth-yoke ratios are discussed in the end.

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Grebenikov, V. V., R. V. Gamaliia, and S. A. Dadychyn. "COMPARATIVE ANALYSIS OF MAGNETIC SYSTEMS OF PERMANENT MAGNET MOTORS FOR TRAM." Tekhnichna Elektrodynamika 2021, no. 5 (August 16, 2021): 27–37. http://dx.doi.org/10.15407/techned2021.05.027.

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A numerical study of eight configurations of magnetic systems of electric motors with permanent magnets for driving a tram was carried out. The permanent magnet electric motor can be used as a high-speed electric drive to replace the existing DC electric drive of a tram, and as a low-speed gearless electric drive of a new generation tram. The most promising configurations of magnetic systems of electric motors with permanent magnets for tram drive have been determined. By varying the geometrical and winding parameters of each of the investigated models of electric motors, the mechanical characteristics are determined, at which the given torque and power are achieved in the entire range of the rotor speed. Also, a thermal calculation was performed taking into account the urban driving cycle of high-speed electric motors with air cooling by a fan and low-speed ones in liquid cooling mode. The calculation of the characteristics of the investigated electric motors was carried out in the Simcentre MotorSolve software package. References 13, figures 8, tables 3.

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Mynarek, Piotr, Janusz Kołodziej, Adrian Młot, Marcin Kowol, and Marian Łukaniszyn. "Influence of a Winding Short-Circuit Fault on Demagnetization Risk and Local Magnetic Forces in V-Shaped Interior PMSM with Distributed and Concentrated Winding." Energies 14, no. 16 (August 19, 2021): 5125. http://dx.doi.org/10.3390/en14165125.

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This paper presents a comparison of 30/8 and 12/8 AC permanent magnet motors with distributed (DW) and concentrated winding (CW) designed for electric vehicle traction. Both prototypes are based on an interior permanent magnet (IPM) motor topology and contain V-shape magnets. The radial flux AC IPM motors were designed for an 80 kW propulsion system to achieve 125 N·m. Finite element models (FEM) used to design the geometry of IPM motors and the required useful parameters of electric motors are widely investigated. The accuracy of finite element models is verified and validated on the basis of test data. Numerical simulations of healthy and faulty operation states, and studies of winding faults based on the FEM offer a deeper understanding of the associated phenomena. Therefore, in this paper, a short-circuit fault in a stator winding was simulated to investigate the transient currents under an external load collapse, for all winding phases. These simulations were used to define other important machine parameters to improve mechanical reliability of the motors and to assess the potential risk of permanent magnet (PM) demagnetization. Furthermore, the analysis of local magnetic forces affecting the PMs in the rotor and their possible displacement in a short-circuit situation were performed, also taking into account the centrifugal force. Lastly, it is demonstrated that the choice of winding configuration has a significant impact on the uncontrolled displacement of magnets in the rotor.

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Rassõlkin, A., A. Kallaste, S. Orlova, L. Gevorkov, T. Vaimann, and A. Belahcen. "Re-Use and Recycling of Different Electrical Machines." Latvian Journal of Physics and Technical Sciences 55, no. 4 (August 1, 2018): 13–23. http://dx.doi.org/10.2478/lpts-2018-0025.

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Abstract The paper discusses the current developments in the recycling of electrical machines. The main attention is devoted to three types of motors: synchronous reluctance motor, permanent magnet assisted synchronous reluctance motor, and induction motor. Base materials of such electrical machines are also described in the paper. Rare-earth permanent magnets used in electrical machines are review separately. Moreover, the paper considers the features of the disassembly and recycling options.

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Zhao, Pan, and YinQuan Yu. "Analysis of Influence of Permanent Magnet Demagnetization on Motor Temperature Rise." Journal of Physics: Conference Series 2395, no. 1 (December 1, 2022): 012022. http://dx.doi.org/10.1088/1742-6596/2395/1/012022.

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Abstract Permanent magnet (PM) motors have high power density and difficult heat dissipation, especially when the PMs have demagnetization faults, which will increase the temperature rise of the motors. In this paper, the magneto-thermal coupling simulation analysis of the PM motor is carried out by the finite volume method, and the influence of different demagnetization degrees of PM demagnetization on the temperature rise of the motor is studied. The simulation results show that as the degree of demagnetization increases, the temperature rise of the motor increases significantly. If the temperature of the PM reaches the maximum working temperature, the demagnetization of the PM will continue all the time.

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Kim, Hyunwoo, Yeji Park, Huai-Cong Liu, Pil-Wan Han, and Ju Lee. "Study on Line-Start Permanent Magnet Assistance Synchronous Reluctance Motor for Improving Efficiency and Power Factor." Energies 13, no. 2 (January 13, 2020): 384. http://dx.doi.org/10.3390/en13020384.

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In order to improve the efficiency, a line-start synchronous reluctance motor (LS-SynRM) is studied as an alternative to an induction motor (IM). However, because of the saliency characteristic of SynRM, LS-SynRM have a limited power factor. Therefore, to improve the efficiency and power factor of electric motors, we propose a line-start permanent magnet assistance synchronous reluctance motor (LS-PMA-SynRM) with permanent magnets inserted into LS-SynRM. IM and LS-SynRM are selected as reference models, whose performances are analyzed and compared with that of LS-PMA-SynRM using a finite element analysis. The performance of LS-PMA-SynRM is analyzed considering the position and length of its permanent magnet, as well as its manufacture. The final model of LS-PMA-SynRM is designed for improving the efficiency and power factor of electric motors compared with LS-SynRM. To verify the finite element analysis (FEA) result, the final model is manufactured, experiments are conducted, and the performance of LS-PMA-SynRM is verified.

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Shi, Li Wei, and Xue Yi Zhang. "High Torque NdFeB PM Motor Design for Cab Lifting Device." Advanced Materials Research 204-210 (February 2011): 225–28. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.225.

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Based on the analysis of the automatic cab lifting devices, a permanent magnet motor was designed to drive the piston pump. With the analysis of three classes of permanent-magnet materials for electric motors, the NdFeB permanent-magnet materials was selected to output enough power for the motor. The dimensions of the magnet and the rotor were determined through theoretical calculation and analysis. NdFeB permanent magnet pump motor has some characteristic as follows: low failure rate, simple structure, high reliability, low noise, high power. It can improve the safety, comfort and manipulation convenience of heavy truck.

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Wu, Yi Chang, and Yi Cheng Hong. "Magnetostatic Field Analysis of Disk-Type Permanent-Magnet Motors." Applied Mechanics and Materials 479-480 (December 2013): 390–95. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.390.

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The aim of this paper is to analyze the magnetostatic field of disk-type permanent-magnet motors by utilizing the 1-D equivalent magnetic circuit approach and the finite-element method. A 1-D equivalent magnetic circuit model, which is analogous to an electric circuit model, of the disk-type permanent-magnet motor is proposed. The accuracy of the analytical model is verified by a commercial 3-D finite-element analysis (FEA) package. The result shows that the air-gap flux density is in good agreement with an acceptable error of about 1.66%. The presented magnetic circuit approach is not only an accurate technique in predicting the magnetostatic field of disk-type permanent-magnet motors, but also effectively reduces the computing time. It is especially suitable for the preliminary design and optimization of permanent-magnet motors with axial-flux topologies.

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Kim, Hwigon, Seon-Gu Kang, Jae-Jung Jung, and Hyun-Sam Jung. "Comparative Study of Magnet Temperature Estimation at Low Speeds Based on High-Frequency Resistance and Inductance." Electronics 12, no. 9 (April 26, 2023): 2011. http://dx.doi.org/10.3390/electronics12092011.

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Interior permanent magnet synchronous motors have been widely used in electric vehicles. These motors employ Nd-Fe-B as the permanent magnet, which is vulnerable to temperature variations. Moreover, some features of Nd-Fe-B magnets are related to temperature, which can affect motor characteristics. Therefore, magnet temperature is an important parameter and methods for estimating it have been developed. In particular, a signal injection method has been developed for low-speed regions. In this method, two parameters are employed: high-frequency resistance and high-frequency inductance. In this paper, these two methods are compared to determine which parameter is more appropriate for estimations at low speeds and to reveal whether signal injection methods can be applied to the standstill condition. The comparison indicated that the high-frequency inductance-based method has a stronger correlation with the magnet temperature at low speed and standstill conditions than the high-frequency resistance-based method.

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Jhankal, Tanuj, and Amit N. Patel. "Design and Cogging Torque Reduction of Radial Flux Brushless DC Motors with Varied Permanent Magnet Pole Shapes for Electric Vehicle Application." Transactions on Energy Systems and Engineering Applications 4, no. 2 (September 29, 2023): 1–13. http://dx.doi.org/10.32397/tesea.vol4.n2.535.

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Brushless direct current motors have more attractive features, making them a promising solution for electric vehicle applications. A 1 kW, 510 rpm, 24-slots and 8-pole inner runner type surface permanent magnet mounted radial flux brushless DC motor with seven different permanent magnet pole shape rotor is investigated. Motors with different permanent magnet shape rotors were designed, and finite element modelling and simulation were carried out. For performance comparison, the initial design with a radial-type pole shape was regarded as a reference design. Cogging torque is detrimental to the overall performance of the motor, typically in low-speed applications like electric vehicles. The primary aim of this paper is to reduce the cogging torque & study its effect on the overall performance of the motor and minimize torque ripples with reduced permanent magnet requirements. The proposed designs are analyzed in terms of cogging torque, flux density, torque, efficiency, flux linkage and back-EMF. The comparative analysis shows that the motor with bump-shaped permanent magnet rotor poles has betterperformance than the others.

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Journal articles on the topic 'Permanent magnet motors'

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