• International Journal of Control, Automation, and Systems
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• v.4 no.1
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• pp.1-9
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• 2006

This paper presents the modeling and multivariable feedback control of a novel high-precision multi-dimensional positioning stage. This integrated 6-degree-of-freedom. (DOF) motion stage is levitated by three aerostatic bearings and actuated by 3 three-phase synchronous permanent-magnet planar motors (SPMPMs). It can generate all 6-DOF motions with only a single moving part. With the DQ decomposition theory, this positioning stage is modeled as a multi-input multi-output (MIMO) electromechanical system with six inputs (currents) and six outputs (displacements). To achieve high-precision positioning capability, discrete-time integrator-augmented linear-quadratic-regulator (LQR) and reduced-order linearquadratic-Gaussian (LQG) control methodologies are applied. Digital multivariable controllers are designed and implemented on the positioning system, and experimental results are also presented in this paper to demonstrate the stage's dynamic performance.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.3
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• pp.124-132
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• 2003

The goal of this paper is to propose a virtual instrumentation system based on three dimensional current coordinates for monitoring power quality A developed system with various experimental graphic screens and numerical results is made up 586-PC and DSP(digital signal processor) board, power quality analyzing and evaluating software for windows. Power parameters are analyzed using correlation signal processing techniques based on the correlation between voltage and current waveforms. Analysis. results are visualized by 3-D current coordinates, and it Is compared and evaluated with conventional time / frequency domain. To verify the validity of the proposed system, power and harmonic parameters of single phase induction motor drives is analyzed and verified.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.18-20
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• 1995

In this paper we presented a calculation method of leakage inductance in electrical machines. For its accurate calculation the finite element method is applied to the analysis of magnetic field distribution. The self and mutual inductances are derived using the results of the magnetic field analysis and the leakage inductance is easily obtained from these inductances. As numerical examples, we tread a single phase transformer and a rotor slot model of induction motor. In the finite element analysis we used the 2D linear magnetostatic formulation with the first-order triangular element.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.878-879
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• 2015

최근 산업계에서 널리 사용되고 있는 유도전동기, 특히 단상 유도전동기는 고주파에 의한 영향으로 인하여 crawling 현상이 발생하기도 한다. 이러한 고주파에 의한 영향을 저감시키기 위하여 주로 skew를 적용시키고 있다. 본 논문에서는 crawling 현상 저감을 위하여 skew 값에 따른 각 차수별 고주파를 분석하고 양호한 토크 특성을 발생시키도록 연구되었다. 또한 2D 해석 및 샘플 제작을 통한 실험을 통하여 실제 모델에서의 skew에 의한 crawling 현상 저감을 확인하였다.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.502-505
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• 2002

A singl-phase power factor corrected converter for switched reluctance motor driving is presented to achieve sinusoidal, near unity power factor input currents. Because it combines a power factor corrected converter and a conventional asymmetric SRM driver Into one power stage, the configuration has a simple structure resulted in low cost. A prototype to drive 6/6 poles SRM employing a parking magnet is designed to evaluate the proposed topology The characteristics and operational mode will be discussed in depth, and the validity of proposed driver will be verified through the experimental results.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.321-324
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• 1998

A single phase induction motor (SPIM) rated in fractional horsepower is widely used in home and industrial equipment: washing machines, fans, refrigerators, etc. In this paper, authors present the experimental results of the SPIM under controlling of currents of main and auxiliary windings by using a one-chip micro stator(OMS). This new starting method is developed to replace the conventional starting device consisted with a mechanical switch and a capacitor. In mentioned method, the soft-starting of SPIM is simply implemented and higher efficiency is obtained in comparison with conventional condenser type SPIM.

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.6
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• pp.560-567
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• 2000

A soft-switching PFC-Inverter for using AC motor drive such as the inverter air-conditioner with single phase medium size is proposed. In order to improve the power factor and the efficiency, in this paper, the ZVT topoloty in the conventional PFC-Inverter is adopted. So, the operation mode of the proposed ZVT PFC-Inverter is analyzed and the optimum circuit is designed. At last, the PSPICE, PSIM simulation and experiment results are presented in order to verify the validity of the proposed circuit.

• Proceedings of the KIEE Conference
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• 2002.04a
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• pp.190-197
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• 2002

The goal of this paper is to propose a virtual instrumentation system based on three dimensional current coordinates for monitoring power quality. A developed system with various experimental graphic screens and numerical results is made up 586-PC and DSP(digital signal processor) board, power quality analyzing and evaluating software for windows. Power parameters are analyzed using correlation signal processing techniques based on the correlation between voltage and current waveforms. Analysis results are visualized by 3-D current coordinates, and it is compared and evaluated with conventional time/frequency domain. To verify the validity of the proposed system, power and harmonic parameters of single phase induction motor drive system is analyzed and verified.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.635-636
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• 2006

A pulse with modulation(PWM) that keeps a constant angle of dwell and adjust duty ratio is a good method to control a speed of SRM. And a method of one pulse control is proper a operation on range of high speed in SRM for a good energy efficiency. Because PWM method is more safety than one pulse method, conversion of those is best choice according the speed range. So, some algorithm is need for smooth conversion of the mode of control. This paper presents a factor of conversion that proper the conversion of control mode between PWM and one pulse method This factor is from estimation of torque and proper at the variable range of conversion and show the better conversion characteristic than constant factor of conversion.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.678-680
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• 2000

We designed and manufactured DSPSRM using the usual output power equation of rotating machine. And the sinusoidaly approximated torque characteristics are achieved by 3D finite element analysis. Also, We calculated average torque per rotation using approximated torque data, calculated by 3D finite element analysis. On this paper, We manufacture torque-meter set and measure the torque characteristic of DSPSRM.