36 results on '"Tae Heoung Kim"'
Search Results
2. AC Copper Loss Sensitivity Analysis According to Stator Slot Shape Parameter Change by Driving Speed of IPMSM with Hair-pin Winding
- Author
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Sang-Geun Jeong, Tae Heoung Kim, and Dong-Woo Kang
- Published
- 2021
3. Analytic Model of Four-switch Inverter-fed Driving System for Wye or Delta-connected Motor with Current Ripple Reduction Scheme
- Author
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Dong-Myung Lee, Seo Weon Heo, Tae Heoung Kim, and Jin-Woo Jung
- Subjects
010302 applied physics ,Engineering ,business.industry ,020208 electrical & electronic engineering ,Ripple ,02 engineering and technology ,01 natural sciences ,law.invention ,Reduction (complexity) ,Capacitor ,Control theory ,law ,Distortion ,Control system ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Inverter ,Electrical and Electronic Engineering ,business ,Degradation (telecommunications) ,Voltage - Abstract
This paper proposes an analytic model for four-switch inverter (FSI)-driven wye (Y) or delta (Δ)-connected motors with a current ripple reduction algorithm. FSIs employ four switches in controlling three-phase load instead of using six switches. They have split dc-link stage, and due to this inherent structure there exists the voltage difference between upper and lower capacitors, which results in distortion of the inverter output voltage. To study characteristics of FSIs, this paper presents an advanced simulation models of FSI-driven control system for 3-phase motor that can has a wire connection either Y or Δ. In addition, this paper introduces a current ripple reduction scheme that mitigates degradation of control performance due to the voltage difference between the dc-link capacitors. The validity of the proposed method and the analytic model is verified by simulations and experiments carried out with 1-HP induction machine with Y or Δ-connection
- Published
- 2016
4. A Nonlinear Sliding Mode Controller for IPMSM Drives with an Adaptive Gain Tuning Rule
- Author
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Jin-Woo Jung, Dong Quang Dang, Ton Duc Do, Jackson John Justo, Han Ho Choi, Nga Thi-Thuy Vu, and Tae Heoung Kim
- Subjects
Setpoint ,Nonlinear system ,Engineering ,Damping ratio ,Control and Systems Engineering ,Control theory ,business.industry ,Settling time ,Overshoot (signal) ,Transient response ,Electrical and Electronic Engineering ,business ,Sliding mode control - Abstract
This paper presents a nonlinear sliding mode control (SMC) scheme with a variable damping ratio for interior permanent magnet synchronous motors (IPMSMs). First, a nonlinear sliding surface whose parameters change continuously with time is designed. Actually, the proposed SMC has the ability to reduce the settling time without an overshoot by giving a low damping ratio at the initial time and a high damping ratio as the output reaches the desired setpoint. At the same time, it enables a fast convergence in finite time and eliminates the singularity problem with the upper bound of an uncertain term, which cannot be measured in practice, by using a simple adaptation law. To improve the efficiency of a system in the constant torque region, the control system incorporates the maximum torque per ampere (MTPA) algorithm. The stability of the nonlinear sliding surface is guaranteed by Lyapunov stability theory. Moreover, a simple sliding mode observer is used to estimate the load torque and system uncertainties. The effectiveness of the proposed nonlinear SMC scheme is verified using comparative experimental results of the linear SMC scheme when the speed reference and load torque change under system uncertainties. From these experimental results, the proposed nonlinear SMC method reveals a faster transient response, smaller steady-state speed error, and less sensitivity to system uncertainties than the linear SMC method.
- Published
- 2015
5. Sliding Mode Control of SPMSM Drivers: An Online Gain Tuning Approach with Unknown System Parameters
- Author
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Jin-Woo Jung, Dong Quang Dang, Viet Quoc Leu, Han Ho Choi, and Tae Heoung Kim
- Subjects
Lyapunov function ,Engineering ,Electronic speed control ,Artificial neural network ,business.industry ,Control engineering ,Sliding mode control ,Term (time) ,System dynamics ,symbols.namesake ,Control and Systems Engineering ,Control theory ,Control system ,symbols ,Electrical and Electronic Engineering ,business - Abstract
This paper proposes an online gain tuning algorithm for a robust sliding mode speed controller of surface-mounted permanent magnet synchronous motor (SPMSM) drives. The proposed controller is constructed by a fuzzy neural network control (FNNC) term and a sliding mode control (SMC) term. Based on a fuzzy neural network, the first term is designed to approximate the nonlinear factors while the second term is used to stabilize the system dynamics by employing an online tuning rule. Therefore, unlike conventional speed controllers, the proposed control scheme does not require any knowledge of the system parameters. As a result, it is very robust to system parameter variations. The stability evaluation of the proposed control system is fully described based on the Lyapunov theory and related lemmas. For comparison purposes, a conventional sliding mode control (SMC) scheme is also tested under the same conditions as the proposed control method. It can be seen from the experimental results that the proposed SMC scheme exhibits better control performance (i.e., faster and more robust dynamic behavior, and a smaller steady-state error) than the conventional SMC method.
- Published
- 2014
6. A Study on the Iron Loss and Demagnetization Characteristics of an Inset-type Flux-Reversal Machine
- Author
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Tae Heoung Kim
- Subjects
Materials science ,Stator ,Demagnetizing field ,Mechanical engineering ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,law.invention ,Nonlinear system ,Nuclear magnetic resonance ,law ,Magnet ,Perpendicular ,Electrical and Electronic Engineering ,Leakage (electronics) - Abstract
Flux-reversal machine (FRM) is cost effective and suitable for mass production due to its simple structure. However, there is a notable permanent magnet flux leakage which deteriorates the performance. To compensate this drawback with a design method, an Inset-Permanent-Magnet-Type FRM (ITFRM) has been proposed. The ITFRM has permanent magnets perpendicular to the stator teeth surface, and thus, is much more difficult to demagnetize. In this paper, we deal with the iron losses and irreversible permanent magnet demagnetization characteristics of the ITFRM according to various design variables and driving conditions. To analyze the characteristics, a two-dimensional finite-element method (2D-FEM) considering nonlinear analysis of permanent magnets is used. As a result, we propose the design variables that have the largest effects on the iron losses and irreversible magnet demagnetization.
- Published
- 2013
7. Comparative Analysis of Flux-Reversal Motors with Six-Switch and Four-Switch Converters
- Author
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Hyun-Soo Kang, Byoung-Kuk Lee, and Tae Heoung Kim
- Subjects
Physics ,Mathematics::General Mathematics ,Converters ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,law.invention ,Control theory ,law ,Eddy current ,Inverter ,Waveform ,Torque ,Voltage source ,Electrical and Electronic Engineering ,Pulse-width modulation ,Voltage - Abstract
In this paper, the 6-switch inverter for the Flux-Reversal Motor (FRM) has been presented and compared to the 4-switch inverter for the FRM, which is more popular in cost effective applications. To analyze the FRM, we adopted the two-dimensional time-stepped voltage source finite element method (FEM) that uses the actual pulse width modulation (PWM) voltage waveforms as the input data. As the FRM characteristic analysis of actual pwm voltage input, the torque ripples and iron losses (eddy current and hysteresis loss) of the FRM can be precisely calculated. With the simulated and experimental results, the performance and limitations of the 4-switch FRM which is the cost effective drive compared to the 6-switch FRM drive are provided in more detail.
- Published
- 2013
8. Digital Speed Regulator System Design for a Permanent Magnet Synchronous Motor
- Author
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Han Ho Choi, Jin-Woo Jung, and Tae-Heoung Kim
- Subjects
Engineering ,Acceleration ,Speed regulator ,Observer (quantum physics) ,Exponential stability ,Permanent magnet synchronous motor ,business.industry ,Control theory ,Control system ,Systems design ,Control engineering ,Electrical and Electronic Engineering ,business - Abstract
In this paper, a digital speed regulator system design method is developed for a permanent magnet synchronous motor (PMSM). Firstly, an accurate approximate discrete-time model is proposed for a PMSM considering its inherent nonlinearities. Based on the discrete-time model, a digital acceleration observer as well as a digital speed regulator is designed. The exponential stability of the augmented control system is analyzed. The proposed digital speed regulator system is implemented by using a TMS320F28335 floating point DSP. Simulation and experimental results are given to verify the effectiveness of the proposed method.
- Published
- 2012
9. Numerical Analysis of a Flux-Reversal Machine with 4-Switch Converters
- Author
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Byoung-Kuk Lee and Tae Heoung Kim
- Subjects
Digital signal processor ,Computer science ,business.industry ,Topology (electrical circuits) ,Converters ,Condensed Matter Physics ,Network topology ,Electronic, Optical and Magnetic Materials ,Control theory ,Electronic engineering ,Voltage source ,Electrical and Electronic Engineering ,business ,Pulse-width modulation ,Digital signal processing - Abstract
Many different converter topologies have been developed with a view to use the minimum number of switches in order to reduce construction costs. Among this research, the four-switch converter topology with a novel PWM control technique based on the current controlled PWM method is thought to be a good solution. In this paper, a two dimensional time-stepped voltage source finite-element method (FEM) is used to analyze the characteristics of a Flux-Reversal Machine (FRM) with a 4-switch converter. To validate the proposed computational method, a digital signal processor (DSP) installed controller and prototype FRM are built and experiments performed.
- Published
- 2012
10. T-S Fuzzy Tracking Control of Surface-Mounted Permanent Magnet Synchronous Motors with a Rotor Acceleration Observer
- Author
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Jin-Woo Jung, Han Ho Choi, and Tae-Heoung Kim
- Subjects
Acceleration ,Angular acceleration ,Observer (quantum physics) ,Control and Systems Engineering ,Control theory ,Rotor (electric) ,law ,Fuzzy control system ,Sensitivity (control systems) ,Electrical and Electronic Engineering ,Robust control ,Mathematics ,law.invention - Abstract
This paper proposes a fuzzy speed tracking controller and a fuzzy rotor angular acceleration observer for a surface-mounted permanent magnet synchronous motor (SPMSM) based on the Takagi-Sugeno (T-S) fuzzy model. The proposed observer-based controller is robust to load torque variations since it utilizes rotor angular acceleration information instead of the load torque value. Linear matrix inequality (LMI) sufficient conditions are given to compute the gain matrices of the speed tracking controller and the observer. In addition, it is mathematically verified that the proposed observer-based control system is asymptotically stable. Simulation and experimental results are presented to confirm that the proposed control algorithm assures a better transient behavior and less sensitivity under model parameter variations than the conventional PI control method.
- Published
- 2012
11. Fuzzy PD Speed Controller for Permanent Magnet Synchronous Motors
- Author
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Jin-Woo Jung, Tae-Heoung Kim, and Han Ho Choi
- Subjects
Engineering ,Electronic speed control ,business.industry ,Stability (learning theory) ,PID controller ,Control engineering ,Fuzzy control system ,Fuzzy logic ,Control and Systems Engineering ,Control theory ,Transient (oscillation) ,Electrical and Electronic Engineering ,Robust control ,business ,Digital signal processing - Abstract
This paper presents a fuzzy PD speed control scheme for the robust speed tracking of a permanent magnet synchronous motor (PMSM). Motivated by the common control engineering knowledge that transient performance can be improved if the P gain is big and the D gain is small in the beginning, a linearizing control scheme with a fuzzy PD controller is proposed. The global system stability is analyzed and the proposed control algorithm is implemented using a TMS320F28335 DSP. Simulation and experimental results are given to verify the effectiveness of the proposed method.
- Published
- 2011
12. Speed Control of Permanent Magnet Synchronous Motors using an Adaptive Controller
- Author
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Tae Heoung Kim and Jin-Woo Jung
- Subjects
Quantitative Biology::Subcellular Processes ,Electronic speed control ,Adaptive control ,Model parameter ,Permanent magnet synchronous motor ,Direct torque control ,Robustness (computer science) ,Computer science ,Control theory ,Regulator ,Control engineering ,Electrical and Electronic Engineering ,Synchronous motor - Abstract
This paper proposes a new adaptive speed controller to achieve a robust speed control of a permanent magnet synchronous motor(PMSM). The proposed adaptive regulator does not require any information on the motor parameter and load torque values, so it is very insensitive to model parameter and load torque variations. Also, the stability of the proposed adaptive control system is proven. To validate the robustness of the proposed adaptive speed controller, both simulation and experimental results are provided under motor parameter and load torque variations. It is clearly demonstrated that the proposed adaptive regulator can accurately control the speed of permanent magnet synchronous motors.
- Published
- 2011
13. Speed control of a permanent magnet synchronous motor with a torque observer: a fuzzy approach
- Author
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Jin-Woo Jung, Han Ho Choi, and Tae-Heoung Kim
- Subjects
Electronic speed control ,Control and Optimization ,Observer (quantum physics) ,Fuzzy set ,Linear matrix inequality ,Control engineering ,Fuzzy control system ,Fuzzy logic ,Computer Science Applications ,Human-Computer Interaction ,Computer Science::Systems and Control ,Control and Systems Engineering ,Control theory ,Electrical and Electronic Engineering ,Synchronous motor ,Mathematics - Abstract
The authors consider the speed controller design problem for a permanent magnet synchronous motor (PMSM). Based on the Takagi–Sugeno fuzzy approach the authors design a fuzzy speed controller as well as a fuzzy load torque observer. The authors derive sufficient conditions for the existence of the controller and the observer in terms of linear matrix inequalities (LMIs). The authors give LMI parameterisations of the gain matrices. The authors also derive LMI conditions for the existence of the fuzzy speed controller and the fuzzy load torque observer guaranteeing α-stability, quadratic performance and H2/H∞ performance. The authors implement the proposed load torque observer-based fuzzy speed control system by using a TMS320F28335 floating point DSP, and give simulation and experimental results to show the effectiveness of the proposed method.
- Published
- 2010
14. A Time-Saving Method for Analyzing Permanent Magnet Motors
- Author
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Tae-Heoung Kim, Ki-Soo Han, and Sung-Hong Won
- Subjects
Engineering ,Stator ,business.industry ,Rotor (electric) ,Cogging torque ,Finite element method ,law.invention ,Magnetic circuit ,Direct torque control ,law ,Control theory ,Magnet ,Electronic engineering ,Torque ,business - Abstract
This paper presents a unique method for simulating permanent magnet motors without time-consuming numerical methods used in the conventional magnetic circuit method. The conventional method gives us average values like torque and power over specified periods of time, but it is usually very difficult and time-consuming to obtain instantaneous characteristics like cogging torques and torque ripples. The convolution operations method we present, however, considers relative angle variations of stator magnetic circuits and rotor magnetic circuits. As a result, it makes uses of instantaneous values possible. The authors compare the new method with the coventional method and verify that calculating cogging torque values and back-emf values is possible with the proposed new convolution method.
- Published
- 2010
15. A Study on the Effect of the Magnetization Direction on the Iron Loss Characteristics in Brushless DC Motors
- Author
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Jin-Woo Jung and Tae Heoung Kim
- Subjects
Materials science ,Condensed matter physics ,Condensed Matter Physics ,DC motor ,Finite element method ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,Magnetization ,Hysteresis ,Nuclear magnetic resonance ,law ,Magnet ,Eddy current ,Voltage source ,Electrical and Electronic Engineering - Abstract
This paper introduces two types of magnetization, and reports the effect of the magnetization direction on the iron loss in a brushless DC (BLDC) motor using a 2-D time-stepped voltage source finite-element method (FEM). The iron losses were found to consist of hysteresis and eddy current loss, which were calculated from the time variation of the magnetic field distribution. To confirm the analysis, a prototype BLDC motor was constructed with a sintered ferrite magnet. The analysis and experimental results suggest that the magnetization direction has a significant effect in terms of the iron loss characteristics of the BLDC motor.
- Published
- 2010
16. A Study on the Design of an Inset-Permanent-Magnet-Type Flux-Reversal Machine
- Author
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Tae Heoung Kim
- Subjects
Coupling ,Flux lines ,Mathematics::General Mathematics ,Computer science ,Stator ,Direct current ,Demagnetizing field ,Magnetic flux leakage ,Flux ,Flux linkage ,Magnetic flux ,Switched reluctance motor ,Electronic, Optical and Magnetic Materials ,law.invention ,Electromagnetic coil ,law ,Control theory ,Magnet ,Torque ,Electrical and Electronic Engineering ,Leakage (electronics) - Abstract
Flux-reversal machine (FRM) is a new doubly salient stator-permanent magnet (PM) machine with flux linkage reversal in the stator concentrated windings. It can operate in both motoring and generating modes. Its simple structure makes it cost effective and suitable for mass production. However, there is notable permanent magnet flux leakage which deteriorates the torque ability of the FRM. In this paper, a novel design to improve the performance of an FRM is proposed. The proposed FRM has permanent magnets parallel to the stator magnet flux lines and thus is much more difficult to demagnetize. To analyze the characteristics of the proposed FRM, a two-dimensional finite-element method (2-D FEM) is used. The prototype FRM is also built to prove the advantage of the new design method. From the analysis and experimental results, it is shown that the proposed FRM has an improved performance.
- Published
- 2009
17. Comparison of the Iron Loss of a Flux-Reversal Machine Under Four Different PWM Modes
- Author
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Heung-Kyo Shin, Ju Lee, Tae Heoung Kim, Hwi-Beom Shin, and Soon-Young Lee
- Subjects
Physics ,Electronic speed control ,Stator ,Flux linkage ,Magnetic flux ,Electronic, Optical and Magnetic Materials ,law.invention ,Control theory ,law ,Magnet ,Voltage source ,Electrical and Electronic Engineering ,Pulse-width modulation ,Machine control - Abstract
A flux-reversal machine (FRM) is a new doubly salient stator-permanent magnet (PM) machine with flux linkage reversal in the stator concentrated windings. It can be driven by 120deg square-wave voltage and use pulse-width modulation (PWM) patterns in two-phase feeding schemes to control the speed of the machine. This paper introduces four PWM modes that used the FRM control system and analyzes the effects of four different PWM modes on the iron loss using a 2-D time-stepped voltage source finite-element method. The iron loss is calculated from the time variation of the magnetic field distribution
- Published
- 2007
18. Motion transient analysis of flat-type vibration motor for mobile phone
- Author
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Sung Hong Won, Ju Lee, and Tae Heoung Kim
- Subjects
Surface (mathematics) ,Computer science ,Acoustics ,Motion (geometry) ,Type (model theory) ,Grid ,Finite element method ,Electronic, Optical and Magnetic Materials ,Quantitative Biology::Subcellular Processes ,Vibration ,Classical mechanics ,Mobile phone ,Torque ,Electrical and Electronic Engineering - Abstract
The flat-type vibration motor has an axial-gap structure. Analyzing axial-gap motors with the two-dimensional (2-D) finite-element method is very difficult because we have to define the analysis surface as a cylindrical surface. In order to simulate the flat-type vibration motor, we have developed new equations of calculation for the torque of the motor, which is uses a 2-D grid model. We have measured the load torque of the vibration motor which is used for the motion transient analysis. The simulated vibration characteristic is compared with experimental value
- Published
- 2006
19. Finite element analysis of flux-reversal machine considering BEMF current of a switch-off phase and v-i characteristics of a transistor and a freewheeling diode
- Author
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Sung Hong Won, Ju Lee, and Tae Heoung Kim
- Subjects
Physics ,Digital signal processor ,business.industry ,Transistor ,Electrical engineering ,Flyback diode ,Finite element method ,Magnetic flux ,Electronic, Optical and Magnetic Materials ,law.invention ,Control theory ,law ,Voltage source ,Electrical and Electronic Engineering ,business ,Voltage - Abstract
This paper describes the effect of pulsating current generated by back-electromotive force (BEMF) current of switch-off phase in flux-reversal machine (FRM) which is driven by 120deg square wave voltage sources. A two-dimension time-stepped voltage source finite element analysis using a direct convergence method is proposed to analyze an electromagnetic field and the BEMF current. To prove the propriety of the proposed analysis method, we build the prototype FRM and a digital signal processor (DSP) installed controller as a set for the experiment
- Published
- 2006
20. The finite element analysis of switched reluctance motor considering asymmetric bridge converter and DC link voltage ripple
- Author
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Seung-Bin Lim, Yong-su Kim, Seungjun Lee, Ju Lee, Tae Heoung Kim, Jae-Hak Choi, and Youn-Hyun Kim
- Subjects
Physics ,Control theory ,Ripple ,Torque ,Commutation ,Voltage source ,Electrical and Electronic Engineering ,Finite element method ,Switched reluctance motor ,Electronic, Optical and Magnetic Materials ,Diode ,Magnetic field - Abstract
This paper presents a characteristic analysis of switched reluctance motor (SRM) considering hard chopping and dc link voltage ripple by using time-stepped voltage source finite element method in which the magnetic field is combined with drive circuit. We also examine the influence of freewheeling diodes and dc link voltage ripple on the performance of a SRM such as torque ripples and radial force on the surface of the teeth. The freewheeling diodes and dc link voltage ripples must be taken into account in predicting the performance of the SRM.
- Published
- 2005
21. Influences of PWM mode on the performance of flux reversal machine
- Author
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Tae Heoung Kim and Ju Lee
- Subjects
Computer science ,Control theory ,Control system ,Magnet ,Flux ,Voltage source ,Electrical and Electronic Engineering ,DC motor ,Pulse-width modulation ,Electronic, Optical and Magnetic Materials ,Machine control ,Voltage - Abstract
The flux reversal machine (FRM) is a new brushless doubly salient permanent-magnet machine. Its operation is similar to that of the brushless dc motor, so it can be driven by 120/spl deg/ square wave voltage and use pulsewidth modulation (PWM) pulse patterns in two-phase feeding scheme to control the speed. This paper introduces PWM modes used in FRM control system, and analyzes their different influences on the performances of the FRM using a time-stepped voltage source finite-element method. To prove the propriety of the proposed analysis method, digital signal processor (DSP) installed experimental devices are equipped and the experiment is performed.
- Published
- 2005
22. Comparison of the Characteristics of a flux reversal Machine under the different driving methods
- Author
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Yon-Do Chun, Ju Lee, Tae-Heoung Kim, and Ki-Bong Jang
- Subjects
Coupling ,Physics ,Rotor (electric) ,Equations of motion ,Flux ,Electronic, Optical and Magnetic Materials ,law.invention ,Direct torque control ,Control theory ,law ,Eddy current ,Torque ,Torque ripple ,Electrical and Electronic Engineering - Abstract
The dynamic characteristics of a flux reversal machine are analyzed using finite-element method coupling with the equation of the driving electric circuit and the motion equation. In this computation, sine-wave and rectangular-wave current drives are used as the driving conditions like a brushless motor, and the results are compared in respect of torque ripple and iron losses. Considering the torque ripples, driving a skewed motor with rectangular wave input is cost effective. However, among the parts of the motor, the rotor experienced high variations of the flux, which results in high losses.
- Published
- 2005
23. Reduction of cogging torque in flux-reversal machine by rotor teeth pairing
- Author
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Sung Hong Won, Ki Bong, Ju Lee, and Tae Heoung Kim
- Subjects
Physics ,Rotor (electric) ,Cogging torque ,Finite element method ,Magnetic flux ,Forging ,Electronic, Optical and Magnetic Materials ,law.invention ,Quantitative Biology::Subcellular Processes ,Vibration ,Quantitative Biology::Quantitative Methods ,Control theory ,law ,Magnet ,Torque ,Electrical and Electronic Engineering - Abstract
The cogging torque of the flux-reversal machine (FRM) may cause some problems like noise and vibration of the motor. By FEM analysis of the cogging torque of FRM, a noticeable feature was found that the rotor teeth width increases, phase and magnitude of the cogging torque varies. So, the rotor teeth pairing method is proposed for reducing the cogging torque of FRM. In this method, we made a rotor which has two different tooth widths and measured the cogging torque of the motor. From the result, we can see that the simulation result is well matched with the measured result and the proposed method is feasible.
- Published
- 2005
24. Iron loss calculation in a flux-concentration-type LOA
- Author
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Yon-Do Chun, Ki Bong Jang, Ju Lee, and Tae Heoung Kim
- Subjects
Physics ,Equations of motion ,Mechanics ,Linear motor ,Finite element method ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,Hysteresis ,Nuclear magnetic resonance ,law ,Magnet ,Eddy current ,Electrical and Electronic Engineering ,Actuator - Abstract
A novel permanent-magnet flux-concentration-type linear oscillatory actuator (LOA) for a compressor is analyzed in this paper. The losses of a flux-concentration-type LOA which is driven by sinusoidal and rectangular-shaped current are compared using finite-element method (FEM). In this computation, the equation of magnetic field is coupled with the equation of the driving electric circuit and the equation of motion. The results are compared with respect to iron losses. The eddy-current loss and hysteresis loss of both the sinusoidal current and rectangular current was calculated using two-dimensional FEM.
- Published
- 2005
25. Starting and high-speed driving of single-phase flux-reversal motor for vacuum cleaner
- Author
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Sung Hong Won, Tae Heoung Kim, Ki-Bong Jang, and Ju Lee
- Subjects
Electric motor ,Inductance ,Magnetic circuit ,Materials science ,Electromagnetic coil ,Equivalent circuit ,Torque ,Mechanics ,Electrical and Electronic Engineering ,DC motor ,Electronic, Optical and Magnetic Materials ,Electromagnetic induction - Abstract
This paper proposes the single-phase flux-reversal motor for a vacuum cleaner. The circuit parameters are determined by using both finite-element method and experimental measurements while a simulation was done by using an equivalent circuit model to derive the dynamic characteristics. Due to the inductance of the coil of high-speed drives, a phase difference occurs between the current and the electromotive force which produces a negative torque that degrades the output. Through simulation, the turn-on angle and turn-off angle that minimize the negative torque are found and simulation results will be compared with the results of the experiment.
- Published
- 2005
26. A set of experiments to more fully characterize linear PM oscillatory machines
- Author
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Ju Lee, Ion Boldea, Tae Heoung Kim, Seung-Bin Lim, Yon-Do Chun, Myung Chin Kim, L. Tutelea, and Joon Seon Ahn
- Subjects
Vibration ,Surface (mathematics) ,Set (abstract data type) ,Noise ,Materials science ,Powder metallurgy ,Acoustics ,Flux concentration ,Magnet ,Electrical and Electronic Engineering ,Electronic, Optical and Magnetic Materials - Abstract
The paper introduces a set of static and dynamic experiments to more fully characterize a linear permanent magnet (PM) oscillatory machine. The proposed set of tests was performed on a PM brushless linear oscillatory machine with surface PM and PM flux concentration movers, respectively. Though the testing arrangement allows for it, temperature, noise and vibration have not been investigated in this paper.
- Published
- 2005
27. A Study of the Design for the Flux Reversal Machine
- Author
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Tae Heoung Kim and Ju Lee
- Subjects
Physics ,Rotor (electric) ,Stator ,Astrophysics::High Energy Astrophysical Phenomena ,Flux ,Mechanics ,Flux linkage ,Magnetic flux ,Finite element method ,Electronic, Optical and Magnetic Materials ,law.invention ,Quantitative Biology::Subcellular Processes ,law ,Magnet ,Torque ,Electrical and Electronic Engineering - Abstract
The three-phase flux reversal machine (FRM) is a doubly-salient stator-permanent magnet machine with flux linkage reversal in the stator three-phase concentrated windings. It can operate in both motoring and generating modes. In this paper, we identify stator/rotor geometrical design variables that influence the cogging, interaction torques, and winding flux linkage using a two-dimensional finite-element method and the flux-magnetomotive force diagram technique. Also, the novel design to improve the performance of the FRM is studied both theoretically and experimentally.
- Published
- 2004
28. Geometric and electrical optimization design of SR motor based on progressive quadratic response surface method
- Author
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Tae Heoung Kim, Ki-Bong Jang, Jae-Hak Choi, and Ju Lee
- Subjects
Optimal design ,Vibration ,Noise ,Computer simulation ,Control theory ,Conjugate gradient method ,Torque ripple ,Electrical and Electronic Engineering ,Finite element method ,Switched reluctance motor ,Electronic, Optical and Magnetic Materials ,Mathematics - Abstract
This paper presents an approximate optimization that is able to determine optimal geometric and electrical design variables of switched reluctance motor. In order to reduce torque ripple that causes noise and vibration, the approximate optimum design has been investigated by means of combining a progressive quadratic response surface method (PQRSM) and a time-stepping finite element method considering drive circuit. The PQRSM is more effective than conjugate gradient method in torque ripple minimization.
- Published
- 2003
29. Finite-element analysis of brushless DC motor considering freewheeling diodes and DC link voltage ripple
- Author
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Jae-Hak Choi, Tae Heoung Kim, Ju Lee, and Kwang Cheol Ko
- Subjects
Physics ,Control theory ,Ripple ,Inverter ,Torque ,Equivalent circuit ,Voltage source ,Electrical and Electronic Engineering ,Flyback diode ,DC motor ,Electronic, Optical and Magnetic Materials ,Diode - Abstract
This paper deals with the characteristic analysis of a brushless dc motor (BLDC) taking into consideration the freewheeling diodes and dc link voltage ripple using a time-stepped voltage source finite-element method. By comparing the experimental results, the authors show that the proposed computational method is useful for the analysis and design of a BLDC motor. They also examine the influence of freewheeling diodes and dc link voltage ripples on the performance of a BLDC motor such as torque ripples and radial force on the surface of the teeth.
- Published
- 2003
30. Comparison of the Iron Loss of a Flux-Reversal Machine Under Four Different PWM Modes.
- Author
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Tae Heoung Kim and Ju Lee
- Subjects
- *
PULSE width modulation , *EDDY currents (Electric) , *HYSTERESIS , *PERMANENT magnets , *FINITE element method , *ELECTROMAGNETISM - Abstract
A flux-reversal machine (FRM) is a new doubly salient stator-permanent magnet (PM) machine with flux linkage reversal in the stator concentrated windings. It can be driven by 1200 square-wave voltage and use pulse-width modulation (PWM) patterns in two-phase feeding schemes to control the speed of the machine. This paper introduces four PWM modes that used the FRM control system and analyzes the effects of four different PWM modes on the iron loss using a 2-D time-stepped voltage source finite-element method. The iron loss is calculated from the time variation of the magnetic field distribution. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
31. Finite Element Analysis of Flux-Reversal Machine Considering BEMF Current of a Switch-Off Phase and v-i Characteristics of a Transistor and a Freewheeling Diode.
- Author
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Tae Heoung Kim, Sung Hong Won, and Ju Lee
- Subjects
- *
SWITCHING systems (Telecommunication) , *ELECTROMAGNETIC waves , *DIGITAL communications , *DIGITAL signal processing , *DIGITAL electronics equipment , *ELECTROMAGNETIC fields , *FINITE element method - Abstract
This paper describes the effect of pulsating current generated by back-electromotive force (BEMF) current of switch-off phase in flux-reversal machine (FRM) which is driven by 120° square wave voltage sources. A two-dimension time-stepped voltage source finite element analysis using a direct convergence method is proposed to analyze an electromagnetic field and the BEMF current. To prove the propriety of the proposed analysis method, we build the prototype FRM and a digital signal processor (DSP) installed controller as a set for the experiment. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
32. Iron Loss Calculation in a Flux-Concentration-Type LOA.
- Author
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Ki Bong Jang, Tae Heoung Kim, Yon-Do Chun, and Ju Lee
- Subjects
- *
MAGNETIC fields , *FINITE element method , *ELECTRIC circuits , *AUTOMATIC control systems , *ELECTRIC lines , *ELECTROMAGNETIC induction - Abstract
A novel permanent-magnet flux-concentration-type linear oscillatory actuator (LOA) for a compressor is analyzed in this paper. The losses of a flux-concentration-type LOA which is driven by sinusoidal and rectangular-shaped current are compared using finite-element method (FEM). In this computation, the equation of magnetic field is coupled with the equation of the driving electric circuit and the equation of motion. The results are compared with respect to iron losses. The eddy-current loss and hysteresis loss of both the sinusoidal current and rectangular current was calculated using two-dimensional FEM. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
33. Reduction of Cogging Torque in Flux-Reversal Machine by Rotor Teeth Pairing.
- Author
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Tae Heoung Kim, Sung Hong Won, Ki Bong, and Ju Lee
- Subjects
- *
MAGNETIC flux , *ROTATIONAL motion (Rigid dynamics) , *TORQUE , *ELECTROMAGNETIC induction , *DENTISTRY , *SIMULATION methods & models - Abstract
The cogging torque of the flux-reversal machine (FRM) may cause some problems like noise and vibration of the motor. By FEM analysis of the cogging torque of FRM, a noticeable feature was found that the rotor teeth width increases, phase and magnitude of the cogging torque varies. So, the rotor teeth pairing method is proposed for reducing the cogging torque of FRM. In this method, we made a rotor which has two different tooth widths and measured the cogging torque of the motor. From the result, we can see that the simulation result is well matched with the measured result and the proposed method is feasible. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
34. A Set of Experiments to More Fully Characterize Linear PM Oscillatory Machines.
- Author
-
Lucian Tutelea, Myung Chin Kim, Yon-Do Chun, Tae Heoung Kim, Seung-Bin Lim, Joon Seon Ahn, Ju Lee, and Ion Boldea
- Subjects
PERMANENT magnets ,OSCILLATIONS ,MAGNETISM ,VIBRATION (Mechanics) ,MACHINERY ,MAGNETICS - Abstract
The paper introduces a set of static and dynamic experiments to more fully characterize a linear permanent magnet (PM) oscillatory machine. The proposed set of tests was performed on a PM brushless linear oscillatory machine with surface PM and PM flux concentration movers, respectively. Though the testing arrangement allows for it, temperature, noise and vibration have not been investigated in this paper. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
35. Starting and High-Speed Driving of Single-Phase Flux-Reversal Motor for Vacuum Cleaner.
- Author
-
Ki Bong Jang, Sung Hong Won, Tae Heoung Kim, and Ju Lee
- Subjects
VACUUM cleaners ,ELECTRIC household appliances ,FINITE element method ,ROTATIONAL motion (Rigid dynamics) ,TORQUE ,MAGNETISM - Abstract
This paper proposes the single-phase flux-reversal motor for a vacuum cleaner. The circuit parameters are determined by using both finite-element method and experimental measurements while a simulation was done by using an equivalent circuit model to derive the dynamic characteristics. Due to the inductance of the coil of high-speed drives, a phase difference occurs between the current and the electromotive force which produces a negative torque that degrades the output. Through simulation, the turn-on angle and turn-off angle that minimize the negative torque are found and simulation results will be compared with the results of the experiment. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
36. Development of a Flux Concentration-Type Linear Oscillatory Actuator.
- Author
-
Tae Heoung Kim, Hyung-Woo Lee, Youn-Hyun Kim, Ju Lee, and Ion Boldea
- Subjects
- *
PERMANENT magnet motors , *PERMANENT magnets , *AUTOMATIC control systems , *MAGNETIC flux , *ACTUATORS , *ELECTRIC potential , *FINITE element method - Abstract
A novel permanent magnet (PM) flux concentration-type linear oscillatory actuator (LOA) for a compressor is proposed in this paper. The proposed LOA has an embedded PM structure and the structure is effective in magnet flux concentration. The flux concentration has a positive influence on the flux linkage, cogging force, and electromotive force. The superiority of the proposed LOA has been confirmed by comparing the performances between the proposed and conventional LOA. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
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