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Jeong-In Lee
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: 18 May 2021 in Energies
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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.

ACS Style

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 Style

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 (10):2905.

Chicago/Turabian Style

Jeong-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.

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: 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: 20 July 2020 in IEEE Transactions on Magnetics
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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.

ACS Style

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 Style

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 (2):1-5.

Chicago/Turabian Style

Jeong-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.

Journal article
Published: 12 March 2020 in IEEE Transactions on Applied Superconductivity
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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).

ACS Style

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 Style

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 (4):1-5.

Chicago/Turabian Style

Jeong-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.

Journal article
Published: 01 December 2019 in AIP Advances
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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.

ACS Style

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 Style

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 (12):125337.

Chicago/Turabian Style

Hoon-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.

Journal article
Published: 01 December 2019 in AIP Advances
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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.

ACS Style

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 Style

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 (12):125319.

Chicago/Turabian Style

Jeong-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.