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Jong-Hyeon Woo
Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Korea

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Journal article
Published: 23 August 2021 in Electronics
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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.

ACS Style

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 Style

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 (16):2036.

Chicago/Turabian Style

Hoon-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.

Journal article
Published: 20 August 2021 in Applied Sciences
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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.

ACS Style

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 Style

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 (16):7670.

Chicago/Turabian Style

Jeong-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.

Journal article
Published: 01 February 2021 in AIP Advances
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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.

ACS Style

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 Style

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 (2):025129.

Chicago/Turabian Style

Tae-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.

Journal article
Published: 27 November 2020 in Applied Sciences
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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.

ACS Style

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 Style

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 (23):8453.

Chicago/Turabian Style

Hoon 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.

Journal article
Published: 12 August 2020 in IEEE Transactions on Magnetics
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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.

ACS Style

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 Style

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 (2):1-5.

Chicago/Turabian Style

Jong-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.

Journal article
Published: 13 April 2020 in IEEE Transactions on Applied Superconductivity
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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.

ACS Style

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 Style

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 (4):1-5.

Chicago/Turabian Style

Jong-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.

Journal article
Published: 01 January 2020 in AIP Advances
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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.

ACS Style

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 Style

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 (1):015217.

Chicago/Turabian Style

Jong-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.