• Title/Summary/Keyword: Linear compressor

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A Study on the Design of Two Phase Drivering Transverse Flux Linear Motor for Compressor (2상 구동 압축기용 횡자속 선형 전동기 설계에 관한 연구)

  • Jeong, D.H.;Woo, B.C.;Kang, D.H.;Chang, J.H.;Kim, J.M.;Hong, D.K.
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.879-880
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    • 2006
  • 횡자속의 기본원리는 릴럭턴스 전동기와 같다. 발생한 힘밀도는 공극과 극간격에 반비례하고 기자력의 자성에 비례한다. 이러한 횡자속 선형전동기를 적용할 경우 추력의 변화로 인해서 진동과 힘의 불평형이 발생하는 것이 일반적이다. 본 논문에서는 이러한 추력 불평형과 진동특성을 향상시킬 수 있는 방법이 다상형으로 구동하는 방법이 있으며 힘을 균일하게 할 수 있고 전동기의 체적을 줄이고 진동특성을 저감시킬 수 있다는 것이라고 판단된다.

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A Dynamic Characteristic of the Multi-Inverter Heat Pump with Frosting (착상을 수반한 멀티 가변속 열펌프의 동특성)

  • ;;Shigeru Koyama
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.5
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    • pp.337-345
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    • 2003
  • In the case of heat exchangers operating under frosting condition, the growth of frost layer causes the heat exchanger to increase the thermal resistance and pressure loss of the air flow. In this paper, a transient characteristic prediction model of the heat transfer for multi inverter heat pump with frosting on its surface was presented taking into account the change of the fin efficiency due to the growth of the frost layer. In this dynamic simulation program, which was peformed for a basic air conditioning system model, such as evaporator, condenser, compressor, linear electronic expansion valve (LEV) and bypass circuit. The theoretical model was driven from the obtained heat transfer coefficient and mass transfer coefficient, independently. And we consider heat transfer performance was only affected by a decrease of the wind flow area. The calculated results were compared with some cases of experiments for frosting conditions.

A Method for Estimating the Piston Stroke of Linear Compressor for Refrigerator (냉장고용 선형 압축기의 피스톤 스트로크 예측기법)

  • Son, Jang-Kyung;Chun, Tae-Won;Lee, Hong-Hee;Kim, Heung-Gun;Nho, Eui-Cheol
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.437-438
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    • 2013
  • 냉장고용 선형압축기가 기존의 왕복동식 압축기보다 높은 효율과 저 소음 때문에 많이 주목받고 있다. 그런데 선형압축기의 피스톤 스트로크는 선형 영구자석형 동기전동기의 입력 전압 및 전류값을 적분하여 구하며, 이 입력 신호에 직류성분이 포함될 경우 스트로크가 발산된다. 본 논문은 적분기대신 전역 통과 필터 및 고대역 통과 필터 등을 사용하여 스트로크의 발산 및 직류 옵셋이 없는 스트로크 예측기법을 제시한다. 시뮬레이션 및 실험을 통하여 제시한 기법의 타당성을 확인한다.

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The performance evaluation of Stirling cryocooler for thermal imaging system (III) : Thermal environmental test (열상장비용 스터링 극저온 냉동기 특성평가 (III) : 열환경시험)

  • 김양훈;박성제;홍용주;김효봉;고득용;이승홍;나종문
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.10a
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    • pp.163-166
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    • 2003
  • This paper presents the results of a series of performance tests for the Stilting cryocooler. Infrared sensor systems incorporating cryocoolers are required to be qualified to the appropriate environmental specification. Linear drive Stilting cryocooler have matured to the stage of undergoing formal qualification test program The thermal environmental test of the Stilting cryocooler is presented in this paper. We performed that low and high temperature keeping test from -4$0^{\circ}C$ to +6$0^{\circ}C$ and operating test at high and low temperature cyclic range with acceptance tests performed at scheduled intervals. Cooling capacity was determined as a function of cooler components temperatures at the compressor, hot end and cold tip. Tests performed on this cooler have been successful with a measured cooling performance of more than 0.8W@80K for 23$^{\circ}C$ ambient temperature with 40 $W_{ac}$ input power.

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The performance evaluation of Stirling cryocooler for thermal imaging system (II) : Life test (열상장비용 스터링 극저온 냉동기 특성평가 (II) : 수명시험)

  • 홍용주;박성제;김효봉;김양훈;권영주
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.10a
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    • pp.324-327
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    • 2003
  • The needs for the cryocooler which has high reliability and long MTTF are increased in the military and commercial thermal imaging system The gas contamination wear, leakage of the working fluid, fatigue and etc. have the significant effects on the reliability and MTTF(Mean Time To Failure) or MTBF(Mean Time Between Failure) of the Stirling cryocooler. In the KIMM, the Stilting cryocooler with the linear compressor was released after the several performance tests were performed. This paper describe the experimental facility for the MTTF evaluation and some typical results of the Stilling cryocooler.

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A Study on the Design of PM Exited Transverse Flux Linear Motor for Compressor (압축기용 영구자석 여자 횡자속 선형 전동기 설계에 관한 연구)

  • Park, G.W.;Kang, D.H.;Chang, J.H.;Woo, B.C.;Hong, D.K.
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1165-1167
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    • 2005
  • 본 논문은 냉각기 등에 적용 가능한 소형 압축기용 영구자석 여자 횡자속 선형 전동기 개발에 관한 내용이다. 3차원 등가 자기 회로망법을 이용하여 전동기의 특성을 해석하고 상용화 되어 사용되고 있는 선형 압축기의 특성과 서로 비교하여 그 성능을 평가 하였다.

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Development of the Dynamic Simulation Program of a Multi-Inverter Heat Pump under Frosting Conditions

  • Park Byung-Duck;Lee Joo-Dong;Chung Baik-Young
    • International Journal of Air-Conditioning and Refrigeration
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    • v.12 no.3
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    • pp.113-122
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    • 2004
  • In case of heat exchangers operating under frosting condition, the thermal resistance and the air-side pressure loss increase with a growth of frost layer. In this paper, a transient characteristic prediction model of the heat transfer for a multi-inverter heat pump with frosting on its surface was presented by taking into account the change of the fin efficiency due to the growth of the frost layer. This dynamic simulation program was developed for a basic air conditioning system composed of an evaporator, a condenser, a compressor, a linear electronic expansion valve, and a bypass circuit. The theoretical model was derived from measured heat transfer and mass transfer coefficients. We also considered that the heat transfer performance was only affected by the decrease of wind flow area. The calculated results were compared with the experimental results for frosting conditions.

Analysis of Dynamic Characteristics of a Piston for a Linear Compressor Considering Changes in Groove Geometry (리니어 압축기에서 그루브 형상 변화에 따른피스톤의 동특성 해석)

  • Noh, Sangwan;Oh, Wonsik;Park, Kyeongbae;Rhim, Yoonchul
    • Tribology and Lubricants
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    • v.31 no.5
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    • pp.221-228
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    • 2015
  • It is possible to prevent a piston from contacting the cylinder by changing the shape of the piston or by applying micro-textures, such as micro-grooves or micro-holes, over the piston surface. Usually, the minimum radial clearance reaches its minimum value at the beginning of the suction stroke because the pressure around the piston is low and almost axisymmetric such that the net pressure force on the piston is not sufficiently high to support the piston from touching the cylinder. In this study, we apply a series of saw-tooth-shaped grooves on the piston surface, and numerically investigate the effects of groove depth, groove angle, and the number of grooves with radial clearance variations using a finite difference method. We conduct a dynamic analysis of the piston for various changes in groove geometries to obtain the minimum radial clearance variation for the entire compression cycle. The minimum radial clearance increases while friction loss decreases when we apply the series of saw-tooth-shaped grooves on the piston. In addition, we analyze the impact of the change in the groove shape variable due to changes in radial clearance. Leakage variations are relevant to radial clearance, but have almost no effect on the groove parameters.

Development of the Pulse Tube Cryocooler for Infrared Detector (적외선 검출기용 맥동관 극저온 냉동기 기술개발)

  • Yeom, Hankil;Park, Seoung-Je;Hong, Hong-Ju;Ko, Junseok;In, Sehwan;Kim, Hyo-Bong
    • Transactions of the KSME C: Technology and Education
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    • v.3 no.4
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    • pp.241-248
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    • 2015
  • Most of the Stirling cryocoolers used for infrared detector cooling in domestic is imported. Because the cooler has a high price, short life and poor durability, demand for the coolers continues steadily. However, the cooler is highly related to defense and space technology, technology transfer or co-development with the countries having experties in cooler design is very limited. The pulse tube cooler to be developed in this study is such that the mechanical piston in low temperature actuating part is replaced by the gas piston and linear compressor is adopted, which results in low vibration, long life and better durability. It is expected that development of the pulse tube cooler will not only improve our technology to the level of advanced countries, but also enhance the skills in designing and manufacturing of the infrared detector.

An experimental study on the cooling performance and the phase shift between piston and displacer in the Stirling cryocooler

  • Park, S. J.;Y. J. Hong;Kim, H. B.;D. Y. Koh;B. K. Yu;Lee, K. B.
    • Progress in Superconductivity and Cryogenics
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    • v.5 no.1
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    • pp.111-117
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    • 2003
  • In the design of the split type free displacer Stilting cryocooler the motion of the displacer is very important to decide the cooling capacity, which depends upon the working gas pressure, the swept volume in the compression space and the expansion space, operating frequency, the phase shift between piston and displacer, etc. In this study, Stirling cryocooler actuated by the electric farce of the dual linear motor is designed and manufactured. Cool down characteristics of the cold end with laser displacement sensor in the expander of the Stilting cryocooler is evaluated. The charging pressure was 15kg$_{f}$/$\textrm{cm}^2$ and operating frequency was 50Hz. Input power and the lowest temperature were about 32W and 67K, respectively. And, displacement of the piston is measured by LVDTs (Linear Variable Differential Transformers), displacement of thedisplacer is measured by laser optic method, and phase shift between piston and displacer is discussed. As the peak-to-peak pressure of the compressor was increased, peak-to-peak displacement of the displacer was increased. The peak-to-peak displacement of the displacer increases in the range of 0 - 64.5Hz(resonant frequency of the displacer), but decreases steeply when the operating frequency is bigger than the resonant frequency. Finally when the phase shift between displacements of the Piston and displacer is 45。, operating frequency is optimum and is decided by resonant frequency of the expander, mass and cross section area of the displacer and constant by friction and flow resistance.e.