• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.428-433
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• 2001

This paper presents the control algorithm for maximum efficiency drives of an induction motor system with the high dynamic performance. This system uses a simple model of the induction motor that includes equations of iron losses. The model, which only requires the parameters of induction motor, is referred to a field-oriented frame. The minimum point of the input power can be obtained at the steady state condition. The reference torque and flux currents for the vector control of induction motors are calculated by the optimal efficiency control algorithm. The drive system with the proposed efficiency optimization controller has been implemented by a 32 bit floating point TMS320C32 DSP chip. The results show the effectiveness of the control strategy proposed for the induction motor drive.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 전기설비전문위원
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• pp.74-76
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• 2009

In this paper, search method and sliding mode observer are developed for efficiency optimization of induction motor. The proposed control scheme consists of efficiency controller and adaptive backstepping controller. A search controller for which information of input of fuzzy controller is included in efficiency controller that uses a direct vector controlled induction motor. The search controller is based on the "Rosenbrock" method and finds the flux level at the minimum input power of induction motor. Once this optimal flux level has been determined, this information is utilized to update the rule base of a fuzzy controller A sliding mode observer is designed to estimate rotor flux and an adaptive backstepping controller is also used to compensate for mechanical uncertainties in the speed control of induction motor. Simulation results are presented to validate the proposed controller.

• International Journal of Railway
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• 제9권2호
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• pp.41-45
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• 2016

In this paper, a study on the efficiency improvement of the magnetic levitation train using the LIM (Linear Induction Motor) was presented. The maglev train has the advantage of being environmentally friendly since much less noise and dust is produced. However, due to structural limitation, compared to a rotating induction motor, linear induction motor, the main propulsion engine of the maglev train has a relatively greater air gap and hence has the lower operation efficiency. In this paper, the relationship between the operating condition of the train and the slip frequency has been investigated to find out the optimum slip frequency that might improve the efficiency of the magnetic levitation train with linear induction motor. The slip frequency is variable during the operation by this relationship only within a range that does not affect the levitation system of the train. After that, the comparison of the efficiency between the conventional control method with the slip frequency fixed at 13.5[Hz] and the proposed method with the slip frequency variable from 9.5[Hz] to 6.5[Hz] has been conducted by simulation using Simplorer. Experiments of 19.5[ton] magnetic levitation trains owned by Korea Institute of Machinery and Materials were carried out to verify the simulation results.

• 전력전자학회논문지
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• 제8권3호
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• pp.211-220
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• 2003

본 논문은 직접 토오크 제어 (Direct Torque control, DTC)를 이용한 릴럭턴스 동기전동기 (Reluctance Synchronous Motor, RSM)의 최대 효율 제어에 관한 연구이다. 릴럭턴스 동기전동기의 등가모델 해석에 있어서 철손의 영향을 고려하여 이론적으로 분석하였으며, 최대효율제어를 위하여 토크 전류와 여자전류 사이의 최적 각을 유도하였다. 릴럭턴스 동기전동기의 경우는 자속이 전류에 비례하므로 유도전동기와는 달리 자속레벨을 제어하면서 토오크의 동특성을 유지할 수 있다는 특징을 가지고 있으며, 제시된 연구에서는 릴럭턴스 동기전동기의 이러한 특징을 적용하여 직접 토오크 제어의 장점인 빠른 토오크 응답특성을 유지하면서 최대 효율 제어가 이루어지도록 한다. d/q 릴럭턴스 비가 2.57인 1.0 Kw 릴럭턴스 동기전동기를 이용하여 실험을 통해 제안된 방법들의 정당성을 입증하였다.

• International Journal of Advanced Culture Technology
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• 제11권1호
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• pp.337-342
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• 2023

Since the electric vehicle uses an electric motor, problems have arisen as the driver hears the inherent noise of the motor or external noise, which was not a problem in the past, due to the overall lower noise environment than when using an internal combustion engine. Therefore, the purpose of this paper is to reduce the noise and vibration of electric motors for electric vehicles, and recently, to increase the speed of high-power, high-efficiency electric motors in a small size, and to develop low-noise motors, IPM motors are applied to produce 35KW electric motors for electric vehicles. A motor for low noise was designed and implemented. N-T Curve and efficiency map were confirmed as the final result of developing a 35KW low-noise motor for electric vehicles by applying the IPM motor applied in this paper. Based on 3500 rpm, Max Torque [Nm]: 121.15, Max Power [KW]: 44.04, and Max Efficiency [%]: 97.65, showing high efficiency.

• 한국항행학회논문지
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• 제27권2호
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• pp.214-220
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• 2023

모터와 ESC (Electronic Speed Control)는 높은 효율을 유지할 수 있는 회전 속도 및 토크의 범위가 존재하기 때문에, 효율적인 시스템 설계를 위해서는 이 범위를 파악하는 것이 중요하다. 본 논문에서는 먼저 측정 장비 대한 정확성을 프로펠러 측정 데이터와 비교 분석하여 검증하였다. 다음으로, 넓은 회전 속도 범위에서의 정적 측정을 통해 각 프로펠러에 대한 통합 효율을 측정하고, 이를 다수의 프로펠러에서 반복하여 얻은 데이터를 이용하여 효율 등치선도를 도출하였다. 측정된 모터-ESC 통합 효율은 단순한 모터 모델로 도출한 모터 자체의 효율과 비교할 때 상당한 차이가 있음을 확인하였고, 또한 동일한 모터라도 ESC에 따라 달라지는 효율의 차이를 분석하였다. 본 연구를 통해 도출한 모터-ESC 통합 효율 등치선도는 추진 효율이 중요한 항공기의 전기 추진 시스템을 설계하고 최적화하는 데에 유용하게 사용될 것으로 예상된다.

• 동력기계공학회지
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• 제15권2호
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• pp.78-83
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• 2011

This paper aims at investigation some operating characteristics and energy usage efficiency of a induction motor and a BLDC motor considering electric propulsion system in a small ship based on battery source. At first, performance curves of discharge voltage from the battery and current from each motor according to the load variations were analyzed. Next, variations of motor torque and rotational speed versus load change at each motor were analyzed. Finally, efficiency of energy usage of the battery and available navigation distance were compared each other. Through some comparisons and analyses, it was cleared that the BLDC motor is more suitable for the motor of the electric propulsion system in small ships based on battery source. It is expected that the results can be used as useful data for design of the electric propulsion system with batteries.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제50권10호
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• pp.483-493
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• 2001

The 3-phase induction is used for the MCP(main coolant pump) and the pure water is used for lubrication of bearing because of the difficulty of repair. Therefore the type of motor is the canned-motor that is welded by sealed can to prevent the stator and rotor from the lubricating water. A lot of Eddy currents are produced in the can because of the conductivity of material. And these eddy currents in the can are the most important cause that decrease the efficiency of induction motor. Therefore we have to find the method to decrease these eddy currents in the can for the improvement of efficiency of motor. In this paper, we proposed the method of design and analysis of canned-motor using equivalent circuit with consideration of can loss for the improvement of efficiency of motor.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권1호
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• pp.91-98
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• 2012

Climate change and other pollutions make a huge demand of environment friendly and high efficient motors especially Brushless DC (BLDC) motors. Generally, bidirectional energized BLDC motors are used widely; however, inverter devices used in the driver put fear of being effected by noise. This paper proposes unidirectional energized BLDC motor which utilizes asymmetrical H-bridge circuit as the driver circuit. The Minato motor is one of the pioneers in unidirectional energized system. The use of bar magnets in the rotor is one of the biggest disadvantages of the motor. We proposed using tabular magnets. The paper compares the power consumption and efficiency of the Minato motor and the proposed motor. During high speed rotation, undesirable armature current is generated that has a deceleration characteristic. This current lowers the motor's efficiency. In this paper, we propose the solutions and show comparison through equations of the copper loss ratio for the Minato and our proposed motors. The third motor, which has the highest efficiency, was discovered during examination of the equations.

• 전기학회논문지
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• 제67권10호
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• pp.1298-1302
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• 2018

Minimum Efficiency Performance Standard (MEPS) has already been operated in many countries. In particular, the European Union (EU) has entered the IE3 stage since 2017. Korea will also enter the IE3 phase from October 2018. As for Korea, there is still a restriction on induction motors only. But, in the EU and the United States, efficiency regulation of variable speed drives is being deeply examined. Standards related to this are gradually being fixed. In this paper, the current status and the direction of global standards related to the efficiency of motors, inverters and systems are reviewed. And the case of improving the efficiency of the system including the motor will be examined.