• Journal of Advanced Marine Engineering and Technology
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• v.32 no.8
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• pp.1278-1284
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• 2008

Electric propulsion motors are operated from a variable frequency drive, which supplies power to motors at a frequency appropriate to the desired speed. The objective of this study was to evaluate power converters for shipboard applications and to recommend converters that meet lower harmonic distortion levels and torque ripples. Two systems were studied in detail : Cyclo-converters and PWM-converters. Cyclo-converters are the obvious choice where size, weight and efficiency are the most critical issues. However they have a disadvantage in power factor and they produce severe torque ripples in the motor which makes them unacceptable without special systems. PWM-converters produces better motor current waveform and eliminates common mode voltage issues at the motor, but suffers a multiple stages of power conversion and the isolating transformer. Results of this case study show that PWM-converters are more advanced and efficient drives for induction motor of electric propulsion ship.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.3
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• pp.498-503
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• 2005

As important device that decide output load in superannuated thermoelectric power plant which do Turbine Load Set Motor device. This generation of electric power system operated Set Up Range Motor according to Set Up value that operator manufactures by hand circumvolve, and generation of electric power output load derision is consisted by internal action including Motor Therefore, in this research passively output load operated Turbine Motor Drive equipment that can have existing Turbine Load Set Motor Performance developing Digital Drive Unit device design. Also control algorithm implementation and existing Turbine Load Set Motor Drive and connection possibility through designed controlling system to connect basis function that decide development output load with Digital Drive Unit that designed also with existing Motor Drive Unit and can be operated.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.1147-1152
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• 2004

Switched Reluctance Motors have an inexpensive, intrinsic simplicity and low cost that makes them well suited to home appliance and office applications. However the motor suffering with necessity of shaft position sensor, lead to non-linearity of operations. Further, the involvement of static converters deteriorates the operational power factor. Implementation of a sensorless algorithm, can remove the need of position sensors. Also, the drive includes a compact power factor control in the input stage by implementing Zero Current Switching Quasi-Resonant Boost Technology. This paper presented, aims at optimized low line current distortion, high power factor, low cost and a shaft position sensorless Switched Reluctance Motor drive.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1999.12a
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• pp.693-700
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• 1999

The Servo motor is consistent with the magnet rotor, winding, magnetic back iron and the sensor. Especially the soft magnetic back iron in the servo motor, which consists of the magnet rotor and winding, and between these two components lies the magnetic circle. Its important to monitor the output power of to make conclusive decision for designs. In these days main household electrical appliances, business machinery and tools are made by process of miniaturization. Because of this miniaturization in hardware, miniaturization of the servo motor is essential But the decrease inside affects the power output. For improve of these has been several attempt at improving the power output of these smaller servo motors. There has been experiment in the servo motor composition, composing of the improvement of the soft magnetic back iron through comparison of the out put power plans are being made.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2584-2586
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• 1999

The purpose of this paper is to verify the appropriation of power electronics circuit by applying the most powerful and widely used simulator PSPICE and SIMULINK for adapted variable control technics. Power semiconductor macro modeled by SIMULINK such as DC motor and AC induction motor. Furthermore DC motor & AC induction motor are modeled by PSPICE through their algorithms. For proved these modelings accurate, simulation techniques which are generally used in the field of power electronics circuits are adapted in power electronics and systems

• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.11
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• pp.1511-1518
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• 2014

Demand for high fuel efficiency and smart features of the vehicles, research has been intensified. Hence, research and development on electric power steering (EPS) system to replace the existing hydraulic steering system has been actively conducted. Permanent magnet motors are widely used in automotive applications due to their high power density and high efficiency. However, increasing price and limited production of rare-earth permanent magnets has recently prompted the auto parts makers to substitute permanent magnet motors by non- or less rare earth magnet motors. Switched reluctance motors SRMs), known as typical non-rare earth motors have simple structure, low manufacturing cost, and high reliability. This paper discusses design, modeling, simulation, and experimental verification of a prototype SRM drive for electric power steering system.

• Journal of the Korean Society of Industry Convergence
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• v.4 no.3
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• pp.305-310
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• 2001

Hydraulic power shifting systems of hydraulic travel motor may be far safer than mechanical power transmission systems. Thus, hydraulic power shifting systems are widely used for speed control on the hydraulic equipments. In the case of liquid shifting lines, the rapid change of area, such as valve closing, can result in a large pressure transient. It is necessary to assure proper control method in order to obtain the smallest shift shock. This study conducts the shock characteristics of hydraulic power shifting system of the hydraulic travel motor. Experimental results show that shock pressure depends on the operating pressure, flow rate and pipe line area. The shock characteristics can be applied for reducing shocks.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.819-820
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• 2006

This paper presents the 3D finite element analysis of contactless power supply with linear servo motor. The voltage source is used to analyze the characteristics of contactless power supply. The primary, secondary self and leakage inductances and the capacitances of a resonant circuit are calculated by the previous finite element analysis are used. Also the driving circuit to supply the power to the linear servo motor is designed. The characteristics analysis of contactless power supply considering the linear servo motor is done.

• The Transactions of the Korean Institute of Power Electronics
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• v.20 no.4
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• pp.330-336
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• 2015

This paper presents a loss-minimizing vector control method for interior permanent magnet synchronous motor (IPMSM). Conventionally, maximum torque per ampere (MTPA) control, which minimizes copper loss, has been widely used in industry. Iron loss, however, is not considered in MTPA control. In this paper, the loss model, including iron loss and copper loss, is derived to further reduce drive loss. The loss-minimizing vector controller is implemented based on the loss model. The controller generates optimal current vectors according to the operating conditions. The performance and validity of the proposed method are proved by experimental results through comparison with conventional methods.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.116-117
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• 2013

The real time simulator for testing the high power inverter unit of a PM synchronous motor is proposed. The power converter of the real time simulator can replaces the dynamo test equipment that consists of a PMSM(PM synchronous motor) and load unit. It is verified by the simulation that the real time simulator has a similar electrical and mechanical characteristics of the PM synchronous motor.