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Mr. Hoon Ki Lee
Chungnam National University, Republic of Korea

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Research Keywords & Expertise

0 permanent magnet synchronous generator
0 electric machine design
0 Permanent Magnet Synchronous Machine
0 Permanent magnet brushless DC Machines and drives
0 Permanent magnet motor

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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: 09 December 2020 in Applied Sciences
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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.

ACS Style

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 Style

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 (24):8792.

Chicago/Turabian Style

Tae-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.

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.