• Proceedings of the IEEK Conference
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• 2002.06b
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• pp.73-76
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• 2002

In this paper we present an integrated Hail sensor It for fan motors, fabricated in industrial bipolar process. As a discrete Hall sensor and signal processing circuitry In the fan motor system were Integrated into single chip a temperature dependence of Hall sensitivity and Hall offset voltage can be compensated and cancelled by on-chip circuitry. We Propose a novel temperature compensation of Hall sensitivity with negative temperature coefficient (TC) using the differential amplifier gain with Positive TC. After a package of the chip was sealed using a plastic Package 20 Pins, the thermal and magnetic characteristics were investigated. The obtained experimental results are in agreement with analytical predictions and have more excellent performance than\ulcorner conventional the fan motor system using discrete Hall sensor.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11a
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• pp.185-190
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• 2001

The structure borne noise of the air-conditioner, which degrades the noise quality, is hardly reduced by the general noise treatments. It can be effectively reduced by eliminating the structural vibration which the noise originates from. The rubber vibration isolator prevents the dynamic force induced by the fan driving motor from exciting the chassis structure, which finally reduces the structure borne noise. The dynamic properties of the vibration isolation system such as the natural frequency of the vibration isolation and loss factor of the rubber isolator, need to be experimentally evaluated. In this paper, these dynamic properties were obtained by the resonant method using the impact hammer for 3 types of the isolator specimens. It is known that the isolation natural frequency of the axial direction of the rubber isolator is two times higher than that of the radial direction, and is proportional to the hardness of the rubber specimen.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1995.10a
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• pp.172-178
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• 1995

보강평판은 평판에 각종 보강재를 용접등의 방법에 의해서 종방향, 횡방향, 경사 또는 임의의 방향으로 부착시켜 굽힘 및 비틀림 강성을 향상시킨 구조요소이다. 이러한 구조요소는 구조적 필요성이나 경량화 설계에 따라 선박의 deck, 철도 차량, 항공기 및 자동차 등의 각종 구조물에서 부하능력 및 경제성을 증대시키기 위하여 널리 사용되고 있고, 또한 자동차용 오일팬, 가전기기의 케이싱과 모터의 케이싱등에도 사용되고 있다. 최근 현장에서는 이러한 구조물의 진동 감소 및 방진 문제가 큰 관심사가 되고 있다. 본 논문은 정사각형 알루미늄 평판에 +자 형태의 Box Beam 보강재를 편면 보강하고 4변 자유단의 경계 조건을 설정하였다. 보강재는 유한요소 정식화 과정을 통하여 평판 요소에 등가시키고, 2차원의 평판 구조로 보강 평판을 모델링하고 구조해석 프로그램인 ANSYS를 이용하여 해석하였다. 실험은 Impact Test에 의해서 주파수 응답 함수(FRF)를 각 시편에 대해서 구하고 이를 해석의 고유진동수와 비교하였다. 그리고 보강재가 임의의 각도로 평판에 부착되었을 때 고유진동수의 변화와 진동 모드(mode shape)를 분석하였다.

• Journal of the KSME
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• v.33 no.11
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• pp.942-950
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• 1993

이 글에서는 자동차용 에어컨의 냉매 규제에 따른 대체냉매의 적용시 에어컨의 성능 변화를 이 론적으로 예측하여 보고, 냉매의 대체에 따른 응축기의 변경에 의한 성능 특성을 실험 결과로 설명하였다. 기존의 응축기(SPC)를 SCC로 교체함으로써 대체냉매를 사용하는 시스템에서 열전 달성능의 향상을 꾀할 수 있었다. 자동차용 에어컨에서 냉매의 교체에 따라 변경이 예상되는 부품으로는 응축기를 비롯하여 증발기, 팽창밸브, 수액기건조제, 압력스위치, 배관호스류, 압축기 압축기오일, 팬모터 등이 될 수 있다. 이러한 요소부품의 변경을 위해 연구개발되어야 할 기술 로는 먼저 운전 및 성능을 고려한 각 부품의 설계기술과 제작기술의 개발이 필요하다. 특히 자 동차의 내구연한의 확장에 따른 에어컨의 내구성 및 신뢰성의 문제는 지속적으로 연구되어야 할 것이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.741-742
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• 2016

IoT(Internet of Things) 기술이 급속도로 발전함에 따라 다양한 분야에 적용되고 있으며, 새로운 부가가치를 창출하고 있다. 최근에는 IoT 기술을 접목하여 도시 내부에 자동화된 농작물 재배시설을 설비하여 재배된 농작물을 직접 현지에 바로 공급할 수 있는 운영시스템을 구축하고 있다. 본 연구는 도심지 내부의 건물 옥상이나 농작물을 재배할 수 있는 임의의 공간에 온실을 설치하여 작물을 재배할 수 있는 환경을 원격으로 관리하는데 있다. 온실 내부의 환경 데이터를 계측하기 위한 온도, 습도, 조도, 토양상태, CO2 센스를 설치하여 온실 내부의 환경을 라즈베리파이2(raspberry Pi2)를 활용하여 계측하였다. 원격으로의 데이터 전송은 Wi-Fi를 이용하여 데이터를 전송하였으며, 중앙에서 관리된 관리정보를 통하여 온실 하우스의 내부 환경을 제어할 수 도록 모터(motor), 환풍기 팬, 조명용 Led, 워터 펌프 등을 제어하도록 하였다. 본 논문의 연구결과를 통하여 비닐하우스의 내부 상태를 계측하고, 다양한 구동장치를 제어할 수 있도록 IoT 기술을 편리하게 적용할 수 있는 라즈베리파이와 원격관리용 스마트 앱(app.)을 이용하여 비닐하우스 내부 관경을 편리하게 관리할 수 있음을 확인하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.2
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• pp.87-96
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• 2001

This paper proposes a new internet Web based concept & design method and implementation of LonWorks network system for remote intelligent control. The Experimental LonWorks network system using i·LON Web server is designed and fabricated. It is also verified that the developed control modules with LonTalk protocol have available inter offerable, reliable performance characteristics from the experimental results, Especially, the results provide a available technical data for remote home, building & plant automation control.

• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.1168-1173
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• 2006

This research is to verify the cooling effect of the acting surface on the rotary motor using heat pipe and conventional cooling fan. In order to show the cooling performance of the rotary motor and heat pipe with the fin-typed heat sink, the surface temperature of the motor and condenser was measured in real time. The experiments were also conducted as for not only cooling device installed with heat pipe only, but with heat pipe and conventional cooling fan simultaneously.

• Journal of the Korean Institute of Gas
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• v.17 no.6
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• pp.15-19
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• 2013

This paper is to analyze and study the cause of fire examples produced because of short phenomenon by electric connecting damage and contacting engine over-heating with combustible materials in engine room of vehicle. In the first example, it knew the fact that the fire produced by contacting with body of vehicle because of loosed of bracket bolt for wire fixing that installed on the transmission case the battery power cable supply the power from battery of engine room to starting motor. In the second example, it certified the fire by short phenomenon because of insulation tape melting wound wiring lined from battery to starting motor. In the third example, it sought for fire's cause that melting phenomenon the wire coating by overheated engine as the wire disconnected with connector by the vibration. Therefore, the fire of system including engine electric made in the danger the people in the car by failure of engine and other system. And than, the car's driver must manage and examine a vehicle conscientiously.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.6
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• pp.51-57
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• 2000

This paper proposes the new concept & design method and implementation of LonWorks network system for remote monitoring & lighting dimming control and telemetry using Web network. The Experimental LonWorks network system for telemetry & remote monitoring and control are designed and fabricated. As a result, it is verified that LonWorks is open, inteoperable, reliable network system from the experimental results, especially, it seamlessly links the data and control networks, allowing the IP(internet) network to be treated as an extension of the LonWorks networks, and vice versa.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.04a
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• pp.281-286
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• 2004

The vacuum cleaner motor runs on very high speed for the suction power. Specially, the motive power is provided by the impeller being rotate on very high speed. And centrifugal fan consists of the impeller, the diffuser, and the circular casing. Due to the high rotating speed or the impeller and small gap distance between the impeller and diffuser, the centrifugal fan makes very high noise level at BPF and harmonic frequencies. In order to calculate the sound pressure of centrifugal fan, the unsteady flow data is needed. And Noise cause is dividing to fluid noise by exhaust flow of fan and vibration noise by rotational vibration of vacuum cleaner fan motor. Until now, measuring method has been used to measure vibration by the accelerometer; this method has been not measured for the vibration in some parts of brush and commutator because of motor construction and 3-D vibrating mode. This paper was purposed on the accurate analysis, using laser vibration analyzer,. By using this measured data of noise cause against the difficult part in old times, we would like to use for the design of silent fan motor.