• Electrical & Electronic Materials
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• v.20 no.7
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• pp.17-24
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• 2007

• Proceedings of the Korean Magnestics Society Conference
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• 1991.11a
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• pp.66-67
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• 1991

• Electric Engineers Magazine
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• v.230 no.10
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• pp.22-29
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• 2001

변압기에서의 고조파의 영향은 두 부분이 있다. 고조파 전류는 동손과 Stay flux 손실을 증가시키는 원인이 되고 고조파 전압은 철손을 증가시킨다. 포괄적으로 순수한 정현파 동작에 비해서 변압기를 과열시킨다.

• 전기의세계
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• v.37 no.5
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• pp.13-16
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• 1988

한국전력공사의 송배전 손실은 '84년 6.34%로서 선진국 수준에 접근하고 있으나 최근에 감소율 둔화로 보다 고차원적인 대책이 필요하며 이의 일환으로 변압기 철손을 1/3-1/4로 줄일 수 있는 Amorphous 변압기 개발이 미국, 일본에서 활발하게 진행되고 있다. 그러므로 본 연구사업은 이에 상품화된 Amorphous 재료를 이용하여 단상, 20KVA Amorphous 변압기 6대를 시험 제작하여 최적설계방법, 제작기술, 경제성 검토를 행하였다.

• Proceedings of the Korean Magnestics Society Conference
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• 2001.04a
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• pp.62-63
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• 2001

• Proceedings of the Korean Magnestics Society Conference
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• 2000.09a
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• pp.516-517
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• 2000

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.5
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• pp.1023-1028
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• 2018

Mechanical gears driven by direct contact have problems including noise, vibration and heat. In order to, solve these problems, magnetic gears having a non-contact magnetic coupling have been proposed. Through various studies on magnetic gears, we found that losses are changed when the number of magnetic poles varies in the same gear ratio. For this reason, research team expect the iron loss of the magnetic gear and the Eddy current loss of the permanent magnet will have a certain tendency depending on the number of poles. This paper identified the magnetic gear's loss tendency according to the number of poles, and laid the basis for efficiency improvement design.

• Transactions of the Korean Society of Automotive Engineers
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• v.23 no.1
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• pp.25-33
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• 2015

This paper presents the d-q axis equivalent circuit model of an interior permanent magnet (IPM) which includes the iron loss resistance. The model is implemented to be able to run in real-time on the FPGA-based HIL simulator. Power electronic devices are removed from the motor control unit (MCU) and a separated controller is interfaced with the real-time simulated motor drive through a set of proper inputs and outputs. The inputs signals of the HIL simulation are the gate driver signals generated from the controller, and the outputs are the winding currents and resolver signals. This paper especially presents iron loss prediction which is introduced by means of comparing the torque calculated from d-q axis currents and the desired torque; and minimizing the torque difference. This prediction method has stable prediction algorithm to reduce torque difference at specific speed and load. Simulation results demonstrate the feasibility and effectiveness of the proposed methods.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.40 no.1
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• pp.67-72
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• 1991

For improving the magnetic properties of the amorphous Fe-B-Si alloy, we annealed the sample in a magnetic field oriented in the plane of the ribbon longitudinal to its long axis. By field annealing, coercive force and total core loss are reduced from 0.04 Oe to 0.02 Oe, and from 0.25 watt/kg to 0.15 watt/kg respectively in comparsion with non-field annealed specimen. These reductions were caused by the formation of 180 dcmain wall parallel to the annealing field due to the induced anisotropy.

• Proceedings of the KIEE Conference
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• 2003.10b
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• pp.131-133
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• 2003

일반적인 BLDCM은 슬롯을 갖고 있기 때문에 코깅 토크가 발생하며, 이로 인하여 토크 리플이 증가한다. 이러한 슬롯을 제거한 슬롯리스 BLDCM은 원인적으로 코깅이 존재하지 않으며, 슬롯의 제거로 인하여 이 부분에서의 철손도 발생하지 않게 된다. 따라서, 우수한 효율과 코깅이 없음으로 인하여, 이러한 특성이 요구되는 특수 분야 뿐 아니라, 일반적인 분야에서도 수요가 기대되는 바이다. 본 연구에서는 슬롯리스형 BLDCM에 대하여 일반 BLDCM과 비교되는 특성을 해석하여 성능의 우수성을 보인다.