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In this study, a magnetic field is analyzed using an analytical method and compared with the electromagnetic characteristics of 8-pole 9-slot and 8-pole 12-slot permanent magnet synchronous machines considering rotor eccentricity. The magnetic flux density and back electromotive force (EMF) are derived using perturbation theory and electromagnetic theory. First, the Fourier modeling of a permanent magnet is performed through magnetization modeling, and two analysis regions are set based on several assumptions for applying the analytical method. Accordingly, the governing equations of the analysis regions are derived in the form of Poisson and Laplace equations. In addition, the undefined coefficients of the general solutions are calculated through general solutions and appropriate boundary conditions, and the magnetic flux density and back EMF of the air gap region are derived based on the definition of the magnetic vector potential. The results obtained using the analytical method are compared with the finite element method and experimental results. In addition, we perform a torque analysis considering rotor eccentricity and analyze the torque ripple based on rotor eccentricity for two cases involving the pole/slot combination.
Hoon-Ki Lee; Tae-Kyoung Bang; Jeong-In Lee; Jong-Hyeon Woo; Hyo-Seob Shin; Ick-Jae Yoon; Jang-Young Choi. Analytical Study and Comparison of Electromagnetic Characteristics of 8-Pole 9-Slot and 8-Pole 12-Slot Permanent Magnet Synchronous Machines Considering Rotor Eccentricity. Electronics 2021, 10, 2036 .
AMA StyleHoon-Ki Lee, Tae-Kyoung Bang, Jeong-In Lee, Jong-Hyeon Woo, Hyo-Seob Shin, Ick-Jae Yoon, Jang-Young Choi. Analytical Study and Comparison of Electromagnetic Characteristics of 8-Pole 9-Slot and 8-Pole 12-Slot Permanent Magnet Synchronous Machines Considering Rotor Eccentricity. Electronics. 2021; 10 (16):2036.
Chicago/Turabian StyleHoon-Ki Lee; Tae-Kyoung Bang; Jeong-In Lee; Jong-Hyeon Woo; Hyo-Seob Shin; Ick-Jae Yoon; Jang-Young Choi. 2021. "Analytical Study and Comparison of Electromagnetic Characteristics of 8-Pole 9-Slot and 8-Pole 12-Slot Permanent Magnet Synchronous Machines Considering Rotor Eccentricity." Electronics 10, no. 16: 2036.
In general, high-speed machines should be designed to satisfy electromagnetic and mechanical characteristics. In this study, the design of high-speed permanent magnet synchronous generator with two different shaft materials considering overhang effect and mechanical characteristics was performed. It was confirmed that the leakage magnetic flux generated by the two shaft materials electromagnetically affects the high-speed generator. Additionally, it is important to accurately predict the natural frequency mode and critical speed to prevent damage and vibration of the rotating body owing to scattering during high-speed rotation. Therefore, the mechanical characteristics of the designed model were analyzed. In this study, we propose a design method that considers both the electromagnetic effects and mechanical characteristics. Subsequently, verification was performed through experiments and comparisons for the validity and reliability of the proposed design method.
Jeong-In Lee; Tae-Kyoung Bang; Hoon-Ki Lee; Jong-Hyeon Woo; Junghyo Nah; Jang-Young Choi. Design of the High-Speed PMSG with Two Different Shaft Material Considering Overhang Effect and Mechanical Characteristics. Applied Sciences 2021, 11, 7670 .
AMA StyleJeong-In Lee, Tae-Kyoung Bang, Hoon-Ki Lee, Jong-Hyeon Woo, Junghyo Nah, Jang-Young Choi. Design of the High-Speed PMSG with Two Different Shaft Material Considering Overhang Effect and Mechanical Characteristics. Applied Sciences. 2021; 11 (16):7670.
Chicago/Turabian StyleJeong-In Lee; Tae-Kyoung Bang; Hoon-Ki Lee; Jong-Hyeon Woo; Junghyo Nah; Jang-Young Choi. 2021. "Design of the High-Speed PMSG with Two Different Shaft Material Considering Overhang Effect and Mechanical Characteristics." Applied Sciences 11, no. 16: 7670.
In this study, analysis of core-loss occurring in the magnetic flux modulation core of a linear magnetic gear and the core of each mover is presented, using an analytical method. Losses in electric machines were generally calculated and analyzed using the finite element method (FEM). However, in the case of core-loss, the exact loss value could not be calculated using FEM data. Therefore, we considered the harmonic component of the air-gap magnetic flux density waveform with the modified Steinmetz equation, and performed a more accurate core-loss analysis with magnetic behavior analysis. Thus, we performed a calculated core-loss characteristic comparison with the FEM and the modified Steinmetz equation.
Jeong-In Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Kyong-Hwan Kim; Key-Yong Hong; Jang-Young Choi. Core-Loss Analysis of Linear Magnetic Gears Using the Analytical Method. Energies 2021, 14, 2905 .
AMA StyleJeong-In Lee, Kyung-Hun Shin, Tae-Kyoung Bang, Kyong-Hwan Kim, Key-Yong Hong, Jang-Young Choi. Core-Loss Analysis of Linear Magnetic Gears Using the Analytical Method. Energies. 2021; 14 (10):2905.
Chicago/Turabian StyleJeong-In Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Kyong-Hwan Kim; Key-Yong Hong; Jang-Young Choi. 2021. "Core-Loss Analysis of Linear Magnetic Gears Using the Analytical Method." Energies 14, no. 10: 2905.
This study presents detailed analytical modeling for electromagnetic performance analysis of actively shielded superconducting machines with air-cored slotless armatures. An actively shielded superconducting machine is composed of a type of nonmagnetic material to prevent saturation of the magnetic flux path, as the field coil has a high magnetic field, and a shield coil is installed on the outside for magnetic shielding. This study presents an analytical modeling technique that considers not only the distribution of armature coils with distributed windings but also the shapes of the field and shield coils. Analytical solutions for each domain are derived using electromagnetic theory, partial differential equations, and boundary conditions. Based on the analytical solutions, electromagnetic performances are analyzed. The analysis results obtained from the proposed analytical method are verified by comparing them with those of finite element analysis.
Kyung-Hun Shin; Tae-Kyoung Bang; Jang-Young Choi; Han-Wook Cho; Kiruba S. Haran. Detailed analytical modeling for electromagnetic performance in actively shielded superconducting machines. AIP Advances 2021, 11, 025306 .
AMA StyleKyung-Hun Shin, Tae-Kyoung Bang, Jang-Young Choi, Han-Wook Cho, Kiruba S. Haran. Detailed analytical modeling for electromagnetic performance in actively shielded superconducting machines. AIP Advances. 2021; 11 (2):025306.
Chicago/Turabian StyleKyung-Hun Shin; Tae-Kyoung Bang; Jang-Young Choi; Han-Wook Cho; Kiruba S. Haran. 2021. "Detailed analytical modeling for electromagnetic performance in actively shielded superconducting machines." AIP Advances 11, no. 2: 025306.
This paper presents the design for a high-speed permanent magnet synchronous machine (PMSMs) considering the demagnetization and mechanical characteristics of rare-earth magnets based on the operating temperature. The TRV equation and plane stress analytical method are considered for the temperature, the rotor size is derived from the analysis results of the sleeve thickness, and the stator is designed on the basis of the results of the electromagnetic analysis method. The B–H curve of the permanent magnet (PM) changes with its operating temperature; thus, a thermal demagnetization analysis is conducted to verify the irreversible demagnetization caused by the operating temperature and armature reaction field using electromagnetic finite element method (FEM). It is necessary to consider the irreversible demagnetization with the operating temperature because it can decrease the electromagnetic performance. Therefore, the electromagnetic characteristics of high-speed machines using rare-earth PMs are analyzed to confirm irreversible demagnetization. The validity of the proposed design is confirmed via comparative verifications with the measured results from prototype models.
Tae-Kyoung Bang; Kyung-Hun Shin; Jeong-In Lee; Jong-Hyeon Woo; Han-Wook Cho; Jang-Young Choi. Design of high-speed permanent magnet synchronous machines considering thermal demagnetization and mechanical characteristic of permanent magnet. AIP Advances 2021, 11, 025129 .
AMA StyleTae-Kyoung Bang, Kyung-Hun Shin, Jeong-In Lee, Jong-Hyeon Woo, Han-Wook Cho, Jang-Young Choi. Design of high-speed permanent magnet synchronous machines considering thermal demagnetization and mechanical characteristic of permanent magnet. AIP Advances. 2021; 11 (2):025129.
Chicago/Turabian StyleTae-Kyoung Bang; Kyung-Hun Shin; Jeong-In Lee; Jong-Hyeon Woo; Han-Wook Cho; Jang-Young Choi. 2021. "Design of high-speed permanent magnet synchronous machines considering thermal demagnetization and mechanical characteristic of permanent magnet." AIP Advances 11, no. 2: 025129.
This study deals with the noise, vibration, and harshness (NVH) characteristic analysis of permanent magnet synchronous motors (PMSMs) for electrical machines, such as electrically driven tools that are used in industries. An improved NVH design is needed for application to industrial tools. In general, the electromagnetic NVH characteristics of PMSMs are classified into electromagnetic excitation sources, such as total harmonic distortion of EMF, torque pulsation, magnetic pull force, and unbalanced magnetic force (UMF). This study compares the vibration and noise generated by fractional pole/slot combinations. In PMSMs with fractional pole/slot combinations, UMF is an important NVH source. PMSMs generate UMF because of armature reaction fields based on the pole/slot combinations and harmonics of magnetic flux density. UMF was derived using the finite element method, and the rotor vibration analysis was performed using electromagnetic mechanical coupling analysis. The analysis results and the effect of electromagnetic excitation characteristics on the rotor vibration of the PMSMs were compared and analyzed.
Tae-Kyoung Bang; Kyung-Hun Shin; Jeong-In Lee; Hoon-Ki Lee; Han-Wook Cho; Jang-Young Choi. Experimental and Comparative Study of Rotor Vibrations of Permanent Magnet Machines with Two Different Fractional Pole/Slot Combinations. Applied Sciences 2020, 10, 8792 .
AMA StyleTae-Kyoung Bang, Kyung-Hun Shin, Jeong-In Lee, Hoon-Ki Lee, Han-Wook Cho, Jang-Young Choi. Experimental and Comparative Study of Rotor Vibrations of Permanent Magnet Machines with Two Different Fractional Pole/Slot Combinations. Applied Sciences. 2020; 10 (24):8792.
Chicago/Turabian StyleTae-Kyoung Bang; Kyung-Hun Shin; Jeong-In Lee; Hoon-Ki Lee; Han-Wook Cho; Jang-Young Choi. 2020. "Experimental and Comparative Study of Rotor Vibrations of Permanent Magnet Machines with Two Different Fractional Pole/Slot Combinations." Applied Sciences 10, no. 24: 8792.
In this study, we performed an electromagnetic characteristic analysis of a permanent magnet synchronous machine considering the current waveform based on static rotor eccentricity. First, the characteristics of the back electromotive force were analyzed through the no-load analysis of the analysis model according to static rotor eccentricity. Next, a dynamic analysis was performed through mathematical modeling of a permanent magnet synchronous motor and PWM method. The input current during operation was derived through the dynamic analysis, and the core loss analysis was performed using derived input current. The core loss analysis was performed using the case where the fundamental wave current was applied and the input current derived through the dynamic analysis, and the results were compared.
Hoon Ki Lee; Tae Kyoung Bang; Jong Hyeon Woo; Hyo Seob Shin; Jang Young Choi. Electromagnetic Characteristic Analysis of Permanent Magnet Synchronous Machine Considering Current Waveform According to Static Rotor Eccentricity. Applied Sciences 2020, 10, 8453 .
AMA StyleHoon Ki Lee, Tae Kyoung Bang, Jong Hyeon Woo, Hyo Seob Shin, Jang Young Choi. Electromagnetic Characteristic Analysis of Permanent Magnet Synchronous Machine Considering Current Waveform According to Static Rotor Eccentricity. Applied Sciences. 2020; 10 (23):8453.
Chicago/Turabian StyleHoon Ki Lee; Tae Kyoung Bang; Jong Hyeon Woo; Hyo Seob Shin; Jang Young Choi. 2020. "Electromagnetic Characteristic Analysis of Permanent Magnet Synchronous Machine Considering Current Waveform According to Static Rotor Eccentricity." Applied Sciences 10, no. 23: 8453.
In general, permanent magnet (PM) motors are driven by a pulse width modulation (PWM) voltage source inverter for vector control. The generated PWM signals cause high-frequency voltage components at the carrier frequency. Such components can increase the electromagnetic losses, thereby necessitating the consideration of the phase current corresponding to the carrier harmonics. This study aims to examine the feasibility of high-speed permanent magnet (PM) motors in which rare-earth magnets are replaced by ferrite magnets, by considering the current harmonics. The electromagnetic characteristics of a high-speed motor with rare-earth and ferrite PMs were analyzed considering the current harmonics. Based on the existing rare-earth magnet model, a ferrite magnet model with the same performance was developed to perform a comparative analysis. The findings were validated via comparison with the experimental results of the manufactured models.
Jong-Hyeon Woo; Tae-Kyoung Bang; Hoon-Ki Lee; Kyong-Hwan Kim; Seung-Ho Shin; Jang-Young Choi. Electromagnetic Characteristic Analysis of High-Speed Motors With Rare-Earth and Ferrite Permanent Magnets Considering Current Harmonics. IEEE Transactions on Magnetics 2020, 57, 1 -5.
AMA StyleJong-Hyeon Woo, Tae-Kyoung Bang, Hoon-Ki Lee, Kyong-Hwan Kim, Seung-Ho Shin, Jang-Young Choi. Electromagnetic Characteristic Analysis of High-Speed Motors With Rare-Earth and Ferrite Permanent Magnets Considering Current Harmonics. IEEE Transactions on Magnetics. 2020; 57 (2):1-5.
Chicago/Turabian StyleJong-Hyeon Woo; Tae-Kyoung Bang; Hoon-Ki Lee; Kyong-Hwan Kim; Seung-Ho Shin; Jang-Young Choi. 2020. "Electromagnetic Characteristic Analysis of High-Speed Motors With Rare-Earth and Ferrite Permanent Magnets Considering Current Harmonics." IEEE Transactions on Magnetics 57, no. 2: 1-5.
This study analyzes and verifies the electromagnetic performance and thrust characteristics of linear magnetic gears using subdomain-based analytical methods. By simplifying the analytical model, the governing equations of each domain are calculated based on the Maxwell equation. In addition, the undetermined coefficients of the governing equations are derived using four boundary conditions. In magnetic gears, where power transmission is important, force characteristics are also important. The force characteristics were calculated using the undetermined coefficients and the Maxwell stress tensor.
Jeong-In Lee; Kyung-Hun Shin; Sung-Won Seo; Tae-Kyoung Bang; Seung-Ho Shin; Kyong-Hwan Kim; Jonathan Bird; Jang-Young Choi. Electromagnetic Performance Analysis and Experimental Verification Considering the End Effect of Linear Magnetic Gears Using Subdomain-Based Analytical Method. IEEE Transactions on Magnetics 2020, 57, 1 -5.
AMA StyleJeong-In Lee, Kyung-Hun Shin, Sung-Won Seo, Tae-Kyoung Bang, Seung-Ho Shin, Kyong-Hwan Kim, Jonathan Bird, Jang-Young Choi. Electromagnetic Performance Analysis and Experimental Verification Considering the End Effect of Linear Magnetic Gears Using Subdomain-Based Analytical Method. IEEE Transactions on Magnetics. 2020; 57 (2):1-5.
Chicago/Turabian StyleJeong-In Lee; Kyung-Hun Shin; Sung-Won Seo; Tae-Kyoung Bang; Seung-Ho Shin; Kyong-Hwan Kim; Jonathan Bird; Jang-Young Choi. 2020. "Electromagnetic Performance Analysis and Experimental Verification Considering the End Effect of Linear Magnetic Gears Using Subdomain-Based Analytical Method." IEEE Transactions on Magnetics 57, no. 2: 1-5.
This study proposes a semi three-dimensional analysis method for a permanent magnet linear device with a radially laminated structure. After the magnetic flux density was calculated using two-dimensional finite element (FE) analysis, the magnetic flux density in the iron core was estimated by considering the volume of the divided core. Finally, a core loss analysis of the laminated core was performed using the modified Steinmetz equation, and the results was compared with the FEM analysis results. Additionally based on the predicted magnetic flux density, the electromagnetic characteristics were compared through the experiment.
Jong-Hyeon Woo; Chang-Woo Kim; Tae-Kyoung Bang; Sung-Ho Lee; Kyu-Seok Lee; Jang-Young Choi. Experimental Verification and Electromagnetic Characteristic Analysis of Permanent Magnet Linear Oscillating Actuator Using Semi 3D Analysis Technique With Corrected Stacking Factor. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.
AMA StyleJong-Hyeon Woo, Chang-Woo Kim, Tae-Kyoung Bang, Sung-Ho Lee, Kyu-Seok Lee, Jang-Young Choi. Experimental Verification and Electromagnetic Characteristic Analysis of Permanent Magnet Linear Oscillating Actuator Using Semi 3D Analysis Technique With Corrected Stacking Factor. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.
Chicago/Turabian StyleJong-Hyeon Woo; Chang-Woo Kim; Tae-Kyoung Bang; Sung-Ho Lee; Kyu-Seok Lee; Jang-Young Choi. 2020. "Experimental Verification and Electromagnetic Characteristic Analysis of Permanent Magnet Linear Oscillating Actuator Using Semi 3D Analysis Technique With Corrected Stacking Factor." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.
In this work, the design and experimental analysis of a high-speed permanent magnet (PM) synchronous generator (PMSG) with a magnetic bearing without mechanical friction were per-formed. The rotor size was derived using the torque per rotor volume method and an analytical method. Rotor structure analysis was performed to verify the validity of the selected sleeve and PM thickness. The magnetic bearing was designed considering the input aerodynamic force and DN-factor. Then, the validity of the proposed design method was verified through the electromagnetic and mechanical analysis, design, and comparison with the experimental results of a high-speed PMSG (124 kW and 36 krpm).
Jeong-In Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Bum-Seog Choi; Byung-Ok Kim; Jang-Young Choi. Experiments and Design Criteria for a High-Speed Permanent Magnet Synchronous Generator With Magnetic Bearing Considering Mechanical Aspects. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.
AMA StyleJeong-In Lee, Kyung-Hun Shin, Tae-Kyoung Bang, Bum-Seog Choi, Byung-Ok Kim, Jang-Young Choi. Experiments and Design Criteria for a High-Speed Permanent Magnet Synchronous Generator With Magnetic Bearing Considering Mechanical Aspects. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.
Chicago/Turabian StyleJeong-In Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Bum-Seog Choi; Byung-Ok Kim; Jang-Young Choi. 2020. "Experiments and Design Criteria for a High-Speed Permanent Magnet Synchronous Generator With Magnetic Bearing Considering Mechanical Aspects." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.
In high-speed permanent magnet synchronous generator (PMSG), the rotor design should not only ensure mechanical stability at high speeds but also ensure the required electromagnetic (EM) performance. This paper deals with the EM analysis and design of high-speed PMSGs considering the rotor structure. In particular, the effects of active power and output voltage due to internal impedance from leakage flux are presented. The relationship between design variables of rotor and performance is analyzed using three-dimensional static finite element analysis and simplified equivalent circuit method. Based on the analysis results, a model with improved EM performance using a nonmagnetic pad is presented according to design parameters of rotor structure. The EM performance and the mechanical reliability of the designed model are validated by comparing the FE results with experimental results.
Kyung-Hun Shin; Tae-Kyoung Bang; Han-Wook Cho; Jang-Young Choi. Design and Analysis of High-Speed Permanent Magnet Synchronous Generator With Rotor Structure Considering Electromechanical Characteristics. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.
AMA StyleKyung-Hun Shin, Tae-Kyoung Bang, Han-Wook Cho, Jang-Young Choi. Design and Analysis of High-Speed Permanent Magnet Synchronous Generator With Rotor Structure Considering Electromechanical Characteristics. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.
Chicago/Turabian StyleKyung-Hun Shin; Tae-Kyoung Bang; Han-Wook Cho; Jang-Young Choi. 2020. "Design and Analysis of High-Speed Permanent Magnet Synchronous Generator With Rotor Structure Considering Electromechanical Characteristics." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.
Rotor eccentricity occurs during manufacturing, causing the de-vice to vibrate and make noise, thereby shortening its life. Its characteristics can be analyzed via the existing finite element method (FEM); however, analyzing characteristics according to design variables is time-consuming. Therefore, we implemented an analytical method that can rapidly identify the characteristics according to the design variables. We derived the magnetic flux density, the back-electromotive force, and the torque through the analytical method according to rotor eccentricity. The rotor eccen-tricity was considered to be based on the perturbation and the electromagnetic theories; accordingly, the governing equations and boundary conditions were derived. The analytical method was validated through FEM and experimental result.
Hoon-Ki Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Jung-Hyo Nah; Jang-Young Choi. Experimental Verification and Analytical Study of Influence of Rotor Eccentricity on Electromagnetic Characteristics of Permanent Magnet Machine. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.
AMA StyleHoon-Ki Lee, Kyung-Hun Shin, Tae-Kyoung Bang, Jung-Hyo Nah, Jang-Young Choi. Experimental Verification and Analytical Study of Influence of Rotor Eccentricity on Electromagnetic Characteristics of Permanent Magnet Machine. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.
Chicago/Turabian StyleHoon-Ki Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Jung-Hyo Nah; Jang-Young Choi. 2020. "Experimental Verification and Analytical Study of Influence of Rotor Eccentricity on Electromagnetic Characteristics of Permanent Magnet Machine." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.
Many methods for magnetic gear design consider magnetic characteristics only. However, the fixed-pole of a magnetic gear is deformed because of the force of attraction between the two permanent magnets on its inner and outer cores. This strain leads to increased mechanical damage to the magnetic gear, decreasing its efficiency. To address this problem, this paper presents a method for the design and analysis of a magnetic gear that considers mechanical stress. We first use finite-element analysis and an experimental prototype to demonstrate the damage caused by a magnetic characteristics only design. We then show how the design flaws may be fixed through redesign. In the redesigned gear, the stress on the fixed-pole is reduced by 67.5%.
Jeong-In Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Dong-Wan Ryu; Kyong-Hwan Kim; Keyyong Hong; Jang-Young Choi. Design and Analysis of the Coaxial Magnetic Gear Considering the Electromagnetic Performance and Mechanical Stress. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.
AMA StyleJeong-In Lee, Kyung-Hun Shin, Tae-Kyoung Bang, Dong-Wan Ryu, Kyong-Hwan Kim, Keyyong Hong, Jang-Young Choi. Design and Analysis of the Coaxial Magnetic Gear Considering the Electromagnetic Performance and Mechanical Stress. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.
Chicago/Turabian StyleJeong-In Lee; Kyung-Hun Shin; Tae-Kyoung Bang; Dong-Wan Ryu; Kyong-Hwan Kim; Keyyong Hong; Jang-Young Choi. 2020. "Design and Analysis of the Coaxial Magnetic Gear Considering the Electromagnetic Performance and Mechanical Stress." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.
This paper deals with analytical and experimental study of permanent magnet linear synchronous machines with horizontally magnetized permanent magnets. Six subdomains are defined as analysis domains considering end effects, slotting effects, and flux pass iron poles. The governing equations for each domain are derived from the Maxwell equation and the constitutive relations in electromagnetic theory, and the second-order differential equations are calculated by using the Sturm-Liouville theory. By applying the boundary conditions, analytical solutions in each area are derived, and electromagnetic performance and generating characteristics can be predicted based on the derived analytical solutions. The proposed analytical method is validated by comparison with finite element and experimental results.This paper deals with analytical and experimental study of permanent magnet linear synchronous machines with horizontally magnetized permanent magnets. Six subdomains are defined as analysis domains considering end effects, slotting effects, and flux pass iron poles. The governing equations for each domain are derived from the Maxwell equation and the constitutive relations in electromagnetic theory, and the second-order differential equations are calculated by using the Sturm-Liouville theory. By applying the boundary conditions, analytical solutions in each area are derived, and electromagnetic performance and generating characteristics can be predicted based on the derived analytical solutions. The proposed analytical method is validated by comparison with finite element and experimental results.
Kyung-Hun Shin; Tae-Kyoung Bang; Sung-Won Seo; Chang-Woo Kim; Jang-Young Choi. Analytical and experimental study for characteristic analysis of permanent magnet linear synchronous machines with horizontally magnetized PMs. AIP Advances 2020, 10, 015049 .
AMA StyleKyung-Hun Shin, Tae-Kyoung Bang, Sung-Won Seo, Chang-Woo Kim, Jang-Young Choi. Analytical and experimental study for characteristic analysis of permanent magnet linear synchronous machines with horizontally magnetized PMs. AIP Advances. 2020; 10 (1):015049.
Chicago/Turabian StyleKyung-Hun Shin; Tae-Kyoung Bang; Sung-Won Seo; Chang-Woo Kim; Jang-Young Choi. 2020. "Analytical and experimental study for characteristic analysis of permanent magnet linear synchronous machines with horizontally magnetized PMs." AIP Advances 10, no. 1: 015049.
This paper presents the magnetic field characteristics of a synchronous generator with a salient pole structure using a simple magnetic equivalent circuit (MEC) method. This method aims to reduce the analysis time considering nonlinearity. By using the MEC, a solution for the magnetic flux density is obtained. The linkage flux is derived using the magnetic flux density of the air gap and the armature voltage is obtained. Additionally, results obtained using the finite-element method and MEC are validated against experimental data.This paper presents the magnetic field characteristics of a synchronous generator with a salient pole structure using a simple magnetic equivalent circuit (MEC) method. This method aims to reduce the analysis time considering nonlinearity. By using the MEC, a solution for the magnetic flux density is obtained. The linkage flux is derived using the magnetic flux density of the air gap and the armature voltage is obtained. Additionally, results obtained using the finite-element method and MEC are validated against experimental data.
Do-Yun Kwon; Tae-Kyoung Bang; Chang-Woo Kim; Kyung-Hun Shin; Jang-Young Choi. Experimental verification and electromagnetic characteristics analysis of wound-rotor synchronous generator using magnetic equivalent circuit method. AIP Advances 2020, 10, 015014 .
AMA StyleDo-Yun Kwon, Tae-Kyoung Bang, Chang-Woo Kim, Kyung-Hun Shin, Jang-Young Choi. Experimental verification and electromagnetic characteristics analysis of wound-rotor synchronous generator using magnetic equivalent circuit method. AIP Advances. 2020; 10 (1):015014.
Chicago/Turabian StyleDo-Yun Kwon; Tae-Kyoung Bang; Chang-Woo Kim; Kyung-Hun Shin; Jang-Young Choi. 2020. "Experimental verification and electromagnetic characteristics analysis of wound-rotor synchronous generator using magnetic equivalent circuit method." AIP Advances 10, no. 1: 015014.
This study aims at improving the design of a linear magnetic gear (LMG) and verifying its reliability using a fabricated prototype. LMGs represent electromechanical energy-conversion machines employing permanent magnets (PMs). However, given the linear structure of power-transmission devices, LMGs are difficult to manufacture. The proposed study presents an LMG-design aimed at facilitating ease of its manufacturing. To this end, the PM-ratio performance was first analyzed for selection of an appropriate basic model, which can be subsequently optimized by changing the PM-shape and flux-modulation poles to realize optimum electromagnetic characteristics. Moreover, mechanical characteristics of the optimized model were analyzed to aid fabrication. Results of finite-element analyses and experiments performed in this study on a fabricated prototype demonstrate the reliability of the proposed model.This study aims at improving the design of a linear magnetic gear (LMG) and verifying its reliability using a fabricated prototype. LMGs represent electromechanical energy-conversion machines employing permanent magnets (PMs). However, given the linear structure of power-transmission devices, LMGs are difficult to manufacture. The proposed study presents an LMG-design aimed at facilitating ease of its manufacturing. To this end, the PM-ratio performance was first analyzed for selection of an appropriate basic model, which can be subsequently optimized by changing the PM-shape and flux-modulation poles to realize optimum electromagnetic characteristics. Moreover, mechanical characteristics of the optimized model were analyzed to aid fabrication. Results of finite-element analyses and experiments performed in this study on a fabricated prototype demonstrate the reliability of the proposed model.
Sung-Won Seo; Kyung-Hun Shin; Gang-Hyeon Jang; Tae-Kyoung Bang; Jang-Young Choi. Improved design and experimental verification of linear magnetic gear using parametric analysis. AIP Advances 2020, 10, 015057 .
AMA StyleSung-Won Seo, Kyung-Hun Shin, Gang-Hyeon Jang, Tae-Kyoung Bang, Jang-Young Choi. Improved design and experimental verification of linear magnetic gear using parametric analysis. AIP Advances. 2020; 10 (1):015057.
Chicago/Turabian StyleSung-Won Seo; Kyung-Hun Shin; Gang-Hyeon Jang; Tae-Kyoung Bang; Jang-Young Choi. 2020. "Improved design and experimental verification of linear magnetic gear using parametric analysis." AIP Advances 10, no. 1: 015057.
This paper compares permanent magnet synchronous motors with rare earth permanent magnets (PM) and those with ferrite PM, and it suggests that ferrite PM can replace rare earth PM. Therefore, the two models with the same output were compared and analyzed by comparing the mechanical and electromagnetic characteristics. Finally, the study is validated experimentally.This paper compares permanent magnet synchronous motors with rare earth permanent magnets (PM) and those with ferrite PM, and it suggests that ferrite PM can replace rare earth PM. Therefore, the two models with the same output were compared and analyzed by comparing the mechanical and electromagnetic characteristics. Finally, the study is validated experimentally.
Jong-Hyeon Woo; Tae-Kyoung Bang; Chang-Woo Kim; Ick-Jae Yoon; Jang-Young Choi. Experimental and comparative study of mechanical and electromagnetic aspects of a high-speed permanent magnetic motor with two different magnetic materials. AIP Advances 2020, 10, 015217 .
AMA StyleJong-Hyeon Woo, Tae-Kyoung Bang, Chang-Woo Kim, Ick-Jae Yoon, Jang-Young Choi. Experimental and comparative study of mechanical and electromagnetic aspects of a high-speed permanent magnetic motor with two different magnetic materials. AIP Advances. 2020; 10 (1):015217.
Chicago/Turabian StyleJong-Hyeon Woo; Tae-Kyoung Bang; Chang-Woo Kim; Ick-Jae Yoon; Jang-Young Choi. 2020. "Experimental and comparative study of mechanical and electromagnetic aspects of a high-speed permanent magnetic motor with two different magnetic materials." AIP Advances 10, no. 1: 015217.
In this paper, the characteristics analysis of a high-speed permanent magnet synchronous generator (PMSG) was performed considering saturation reactance. The equivalent circuit method (EMC) is a method for predicting performance in the design process of a generator. When using EMC, if the inductance of the equivalent circuit is not considering saturation, it is difficult to predict the performance of a generator accurately. Therefore, we applied a reactance that considered saturation to derive more accurate performance prediction through short-circuit analysis. The proposed method was verified using finite element method.In this paper, the characteristics analysis of a high-speed permanent magnet synchronous generator (PMSG) was performed considering saturation reactance. The equivalent circuit method (EMC) is a method for predicting performance in the design process of a generator. When using EMC, if the inductance of the equivalent circuit is not considering saturation, it is difficult to predict the performance of a generator accurately. Therefore, we applied a reactance that considered saturation to derive more accurate performance prediction through short-circuit analysis. The proposed method was verified using finite element method.
Hoon-Ki Lee; Tae-Kyoung Bang; Jeong-In Lee; Kyung-Hun Shin; Jang-Young Choi. Characteristics analysis of a high-speed permanent magnet synchronous generator considering magnetic reactance derived from short circuit analysis. AIP Advances 2019, 9, 125337 .
AMA StyleHoon-Ki Lee, Tae-Kyoung Bang, Jeong-In Lee, Kyung-Hun Shin, Jang-Young Choi. Characteristics analysis of a high-speed permanent magnet synchronous generator considering magnetic reactance derived from short circuit analysis. AIP Advances. 2019; 9 (12):125337.
Chicago/Turabian StyleHoon-Ki Lee; Tae-Kyoung Bang; Jeong-In Lee; Kyung-Hun Shin; Jang-Young Choi. 2019. "Characteristics analysis of a high-speed permanent magnet synchronous generator considering magnetic reactance derived from short circuit analysis." AIP Advances 9, no. 12: 125337.
In this study, we designed, analyzed, and tested a permanent magnet synchronous generator by considering the mechanical characteristics of the rotor and the stator of an unmanned aerial vehicle (UAV) system operating at high-speed (40krpm). The size of the generator rotor was determined using the torque per rotor volume (TRV) analytical method. The designed generator uses a sleeve to prevent damage to the magnet during high-speed operation, and this sleeve must be designed to take into account the relationship between its mechanical characteristics and thickness, which affects electromagnetic behavior. Hence, the permanent magnet and the thickness of the sleeve and were selected by analyzing the rotor structure and considering the mechanical characteristics at the rated rotation speed. The characteristics of the designed generator were analyzed using the finite elements method and verified by experimental testing.In this study, we designed, analyzed, and tested a permanent magnet synchronous generator by considering the mechanical characteristics of the rotor and the stator of an unmanned aerial vehicle (UAV) system operating at high-speed (40krpm). The size of the generator rotor was determined using the torque per rotor volume (TRV) analytical method. The designed generator uses a sleeve to prevent damage to the magnet during high-speed operation, and this sleeve must be designed to take into account the relationship between its mechanical characteristics and thickness, which affects electromagnetic behavior. Hence, the permanent magnet and the thickness of the sleeve and were selected by analyzing the rotor structure and considering the mechanical characteristics at the rated rotation speed. The characteristics of the designed generator were analyzed using the finite elements method and verified by experimental testing.
Jeong-In Lee; Kyung-Hun Shin; Gang-Hyeon Jang; Tae-Kyoung Bang; Dong-Wan Ryu; Jang-Young Choi. Design criteria and experiments considering the mechanical characteristics of high-speed permanent magnet synchronous generator of 8kW and 40krpm class. AIP Advances 2019, 9, 125319 .
AMA StyleJeong-In Lee, Kyung-Hun Shin, Gang-Hyeon Jang, Tae-Kyoung Bang, Dong-Wan Ryu, Jang-Young Choi. Design criteria and experiments considering the mechanical characteristics of high-speed permanent magnet synchronous generator of 8kW and 40krpm class. AIP Advances. 2019; 9 (12):125319.
Chicago/Turabian StyleJeong-In Lee; Kyung-Hun Shin; Gang-Hyeon Jang; Tae-Kyoung Bang; Dong-Wan Ryu; Jang-Young Choi. 2019. "Design criteria and experiments considering the mechanical characteristics of high-speed permanent magnet synchronous generator of 8kW and 40krpm class." AIP Advances 9, no. 12: 125319.