• The Transactions of the Korean Institute of Electrical Engineers
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• v.40 no.3
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• pp.250-257
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• 1991

In the analysis of the electric machine by finite element method, the primary current has been selected as a driving source. But the voltage is constant and the primary current varies according to the load condition in the pracdtical system. Therefore, in this paper, magnetic flux distribution, primary current, input effective power, power factor, efficiency and propulsion force of S.L.I.M. were calculated by the finite element method cnsidering the voltage as a driving source. Because the driving characteristics could not be measured in the S.L.I.M., voltage-current curve, 3-phase current curve, and propulsion force were measured at the starting and they were compared with theoretical values.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.816-818
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• 2001

This paper shows the characteristic analysis for an inverter fed induction motor by the 2-D F.E.A. in variation of the air gap length. Harmonic effects of the induction rioter with different air gap length driven by the 6 step voltage of inverter ate investigated. And the results of the characteristic analysis on the inverter fed induction motor are compared with those of sinusoidal voltage fed motor.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.927-929
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• 2001

Induction Motor fed by PWM inverter generates the sound and the vibration because of harmonic current and magnetic force characteristics. This paper is investigated the harmonic frequency and noise characteristics of the current and the torque of the induction motor when the input voltage is excited as the sine wave or PWM wave. The performance characteristics of induction motor is analyzed by the F.E.M and the theoretical method.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.907-909
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• 2001

This paper proposes the analysis method for the pole change motor that is a capacitor-run single-phase induction motor. As the Magneto motive force(MMF) at 2-role becomes severe distortion, it is necessary to consider the harmonics for the characteristic analysis of the motor. Therefore, the performance of motor is analyzed by equivalent circuit considering the harmonic components. The validity of the proposed analysis method for the pole change motor is verified through simulations and experimental results.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.51 no.7
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• pp.331-338
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• 2002

An inverter-fed induction is driven by a harmonic voltage source so that it is necessary to be analysed by time-stepping F.E.M. But it takes so long time that disadvantageous to design. This paper presents a simple analysis method for inverter-fed induction motor using FEM and harmonic equivalent circuit. First, the rotor bar resistance and the leakage reactance are determinated by FEA for 1 slot region in rotor to consider the skin effect and the saturation. Secondly, the characteristic of the motor is analyzed by the harmonic equivalent circuits consisting of the obtained parameters from the FEA. This method is carried out to analyze an induction motor driven by the sinusoidal voltage and the inverter. The results are verified by comparing with those of the time-step F.E.A and the experiment.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.6-8
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• 1995

This paper describes the characteristic- analysis and tile optimum design of the single-phase permanent-split condenser motor. The equivalent circuit is constructed by the symmetrical coordinate method and proved its validity by comparing with the experimental data. Then, the numerical optimization technique is applied to improve the efficiency of the motor.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.659-662
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• 2003

This paper analyzes the electro-mechanical characteristics of the spindle motor in a computer hard disk drive due to the trapezoidal and sinusoidal driving methods. The driving circuit equation is modified by considering the switching action of PWM inverter, and is coupled with the Maxwell equation for the analysis of the magnetic field. Mechanical motion of a rotor is calculated by solving Newton-Euler equation. Electro-mechanical excitation and dynamic response are characterized by analyzing the free response of a rotating rotor and Fourier analysis of the excitation force.

• 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.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.49 no.12
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• pp.797-806
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• 2000

In this paper, the torque characteristics and the bar loss distribution are analyzed when a general cage induction motor with skewed slots is fed by a 6-step inverter. For the electromagnetic analysis, time-stepping finite element method is used. And the multi-slice technique and sliding surface technique are respectively utilized to consider the skew effect and the rotation of the rotor. As a result, the effects of skewed rotor bar and the inverter output voltage on the characteristics of the torque and bar loss in the rotor are investigated. The simulation results are verified by measurement of flux density distribution axially in the stator teeth.

• Proceedings of the KIEE Conference
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• 1997.07a
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• pp.6-8
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• 1997

This paper describes on the dynamic characteristic analysis of a inverter-fed linear synchronous motor with surface type permanent magnet using time-stepped finite element method. We can certify that the proposed simulation method can be used at the dynamic characteristic analysis of other inverter-fed linear motor.