• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.203-206
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• 2000

This paper presents a torque ripple reduction technique of direct torque control(DTC) for high power induction motors driven by 3-level inverters with the inverter switching frequency limited around 0.5-1kHz level. It is noted that conventional DTC algorithms to reduce torque ripple are devised for applications with relatively high switching frequency above 2-3kHz. A new DTC algorithms especially for low switching frequency inverter system illustrates relatively reduced torque ripple are devised for applications with relatively high switching frequency above 2-3kHz. Anew DTC algorithm especially for low switching frequency inverter system illustrates relatively reduced torque ripple characteristics Simulation and experimental results show the effectiveness of the proposed control algorithm

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.296-297
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• 2011

Many applications involving induction motors that are controlled using variable frequency drives require the ability to stop quickly. These applications include emergency stops, quick stopping of fans, centrifuges, presses, etc. The technique that is widely accepted in the industry for achieving quick stopping makes use of brake resistors in series with a power semiconductor switch. The switch-resistor combination (brake-unit) is applied across the dc bus. The fastest decelerating time achievable depends on the size of the resistors and the switch employed. In this paper, the authors propose a novel method of achieving quick stopping times without the use of any brake-unit. Experimental test results with and without this method on a large inertia motor-load combination show that the proposed stopping method is able to reduce the stopping time significantly compared to normal decelerated stop without the need for a braking unit.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.607-611
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• 1992

This paper presents the methods in improving the efficiency using of magnet wedge. After the energy crises of 1970's, more emphasis was placed on higher efficiencies. Efficiency of an induction motor can be improved by reducing the total losses, copper, losses, iron or core losses etc. However high efficiency designs result, in larger size and cost than standard motors. In the methods of the reducing the losses, ripple losses of slot flux can be reduced by using the magnet wedge, but the starting torque decrease by means of increasing of leakage reactance.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.881_882
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• 2009

The purpose of this paper is Characteristics Analysis according to thickness of Secondary Conductor in Tubular Linear Induction Motor(TLIM). Linear motors make good used of several applications as pumps and linear actuator. Characteristic equations of TLIM are obtained form voltage equation. And parameters of voltage equation are calculated.

• Journal of the Korean Society of Industry Convergence
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• v.3 no.1
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• pp.9-15
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• 2000

This paper presents a implementation of digital motion control system for induction motor vector drives using the 16bit DSP TMS320F240. The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent controllers for motors which can be yield enhanced operation, fewer system components, lower system cost, increased efficiency and high performance. The system presented are speed and current sensing, sine look-up table and generated SVPWM by fully integrated control software. The developed system in a implementation are shown a good speed response and motion control characteristic results, and high performance features in general purposed 2.2[kW] machine. The system can be adapted variform motor drive system.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.7
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• pp.1308-1313
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• 2001

This paper presents methods of parameter measurement and starting characteristics of a 3 phase induction motor. The motor parameters measured by DC test, blocked rotor test, and no load test are used as the input data for computer simulation. Starting characteristics are analyzed through computer simulation using measured parameters, and the simulation results are compared with the experimental results obtained by using strain gauge attached on the motor shaft. It is conformed that the experimental results are very similar to those of the simulation.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.849-851
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• 2001

This paper presents experimental method of parameter measurement and starting characteristics of 3 phase induction motor. Equivalent circuit parameters measured by DC test, the blocked rotor test, and no load test were used as the input data for computer simulation. Starting characteristics, such as starting current and torque were analyzed through computer simulation by Matlab, and the simulation results were compared with experiment using strain gauge attached on motor shaft. We conform that experimental results are very similar to that of simulation.

• Proceedings of the KIEE Conference
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• 1989.11a
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• pp.313-316
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• 1989

A steady state analysis of a load commutated current source inverter which is widely used in high voltage - high power induction motor drive systems at present is presented and its related results are discussed. This analysis proposes a method by which we can determine the output capacitor playing a dominant role on the performance of the system. It is shown that the capacitance of output capacitors is mainly dependent on the range of frequencies that the inverter is operated in the load commutated state.

• Proceedings of the KIEE Conference
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• 2000.07e
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• pp.162-166
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• 2000

In this paper, a maximum efficiency control technique of real-time processing in which parameter variation is compensated in vector control of an induction motors(I.M.) is proposed. Based on equivalent model of I.M., a loss minimization factor(LMF) with the variations of speed is derived. To solve problem of inaccuracy of LMF curves due to machine parameter variation, rotor resistance estimation is performed by using instantaneous reactive power. The estimated rotor resistance values are applied to the maximum efficiency control with a LMF.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2748-2750
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• 1999

This Paper describes the design of an induction motor control using the TMS320C32 Digital Signal Processor and the ADMC201 motion coprocessor. Presented hardware architecture can be used for several industry applications with wide range of speed control, e.g. elevator and cranes application, servo motor, electrical vehicles. The main purpose of the paper is demonstration of the implementation and maximum utilization of the ADMC201 motion coprocessor in digital vector control system for AC drives.