• Title, Summary, Keyword: Magnetic contactor

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Design and Analysis Method for A DC Magnetic Contactor with a Permanent Magnet

  • Kim, So-Hyun;Park, Hyeon-Jeong;Ro, Jong-Suk;Jung, Hyun-Kyo
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.4
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    • pp.481-486
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    • 2014
  • The demand for a DC power distributed system is increasing as renewable energy sources and DC electrical load are proliferating. For the automation of a power system, a magnetic contactor for the DC power system is required. The conventional magnetic contactors are mostly equipped with a solenoid magnetic actuator. However, the conventional magnetic contactor has problems with continuous power consumption, and heat generation. To address these problems, a permanent magnet type DC magnetic contactor is proposed in this paper.

Lifetime improvement of 4P Magnetic Contactor (4P 전자접촉기의 수명 향상)

  • Lee, Kyung-Ku;Ryu, Jong-Sang;Kim, Gyeon-Mook;Park, Ji-Hong;Jo, Hyun-Kil;Seo, Jung-Min
    • Proceedings of the KIEE Conference
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    • pp.42-44
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    • 2001
  • This paper proposes impact vibration theory of magnetic contactor moving mechanism and correlation test the bouncing time with the spring load. Mechanical and electrical lifetime is under the influence of impact vibration of magnetic contactor moving mechanism. In shortage of technique, we have experienced many difficulties in magnetic contactor development. By this research, we analyzed total moving mechanism and applied results to optimum 4p magnetic contactor development.

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A study of warpage caused by glass fiber orientation in Injection Molding to Upper Frame of Magnetic Contactor in 85 AF (Magnetic Contactor Upper Frame 사출성형시 유리섬유 배향에 따른 뒤틀림 변형에 관한 연구)

  • Park, Jin-Young;Cho, Hae-Yong;Kim, Kil-Su;Hwang, Han-Seong
    • Proceedings of the KSME Conference
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    • pp.766-771
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    • 2000
  • As using of insulating material of plastic to industrial electric field, thermoset has been gradually substituted for thermoplastic. But changing the material with crystalline has some problem, which is strength or warpage, Especially getting a strength to endure inner pressure is necessary when arc is occurred. So we use the material that is composed of glass fiber to compensate strength. By the way as the reinforced glass-fiber material is used in injection molding, unstableness of dimension is appeared frequently and it is difficult to know warpage pattern. So this paper will be contributed to know warpage pattern of mold product that is upper frame of magnetic contactor caused by glass-fiber orientation with fixed gate-system, when glass-fiber reinforced material with classification of poly-amide is used in injection molding.

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A Study on Accelerated Life Tests for Magnetic Switch Used in Distribution System (배전선로에 사용되는 전자개폐기(Magnetic Switch)의 가속수명시험에 관한 연구)

  • Ryu, Haeng-Soo;Han, Gyu-Hwan;Kwon, Young-Il
    • Proceedings of the KIEE Conference
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    • pp.536-540
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    • 2002
  • In this paper, accelerated life test (ALT) models and procedures for Magnetic Switch (MS) are developed and applied to assure specified reliability of the products at development phase and guarantee the life of the products. Magnetic contactor that functions with over-current relay is called MS. Magnetic contactor closes and opens the motor load with ON/OFF switch of electronic contactor. It is also used for protecting and controlling the load. Magnetic contactor detects the over-current flow in the load with a over-current relay and disconnects the load by opening its control power. In this study, ALT models for MS are developed using the relationship between stresses and life characteristics of products. Using the ALT models, we performed life tests and analyzed the tests results. The proposed ALT models and procedures may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably. Finally the results of this study will contribute to improving reliability of products and strengthening competitiveness of our products in world markets.

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To Ensure A Product Reliability The Study on Accelerated Stress Tests for Magnetic Switch Used in Power Distribution System (제품 신뢰성 확보을 위한 배전 계통에 사용되는 전자개폐기 가속스트레스시험에 관한 연구)

  • Ryu, Haeng-Soo;Park, Sang-Yong;Han, Gyu-Hwan;Kwon, Young-Il;Yoon, Nam-Sik
    • Proceedings of the KIEE Conference
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    • pp.377-380
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    • 2005
  • In this paper, accelerated stress test(AST) for Magnetic Switch (MS) are applied to assure specified reliability of the products. Magnetic contactor that functions with over-current relay is called MS. Magnetic contactor closes and opens the motor load with ON/OFF switch of electronic contactor. It is also used for protecting and controlling the load. Magnetic contactor detects the over-current flow in the load with a over-current relay and disconnects the load by opening its control power. In this study, AST for product assembly are developed in order to improve the weak point so that increase the product reliability. Also we will show the basic information for the accelerated life test(ALT). The proposed AST results and procedures may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably. Finally the results of this study will contribute to improving reliability of products and strengthening competitiveness of our products in the world markets.

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A study on the suppress method of arc on a electromagnetic contactor (전자개폐기의 arc 억제방안에 관한 연구)

  • 노창주;홍순일;정승환
    • Journal of Advanced Marine Engineering and Technology
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    • v.7 no.1
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    • pp.40-48
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    • 1983
  • Nowadays electromagnetic contactors are used for power on-off in various electrical loads. If the severe arc are occurred when power off, the magnetic contactor can not long run because of damage of contactor. In this paper, Authors indicate a method of how to minimize the arc when power off, Authors contrived a electronic circuit which can adjust the demagnetizing point of electro magnetic contactor, and control the demagnetizing point, utilizing our circuit, so as to occur the extinguish of arc at near the AC current zero point which is indispensibly exists. From the results of study, Authors could get confirmations the AC circuit could cut off with occurrence of mininum arc, and that possibility of extensive utilization of our method to hightension circuit.

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The Operating Characteristic Analysis of PM-type MAGNETIC CONTACTOR (영구자석형 전자접촉기의 동작특성 해석)

  • Cho, Hyun-Kil;Lee, Eun-Woong;Kim, Gil-Su;Kim, Il-Jung;Kim, Sung-Jong
    • Proceedings of the KIEE Conference
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    • pp.792-794
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    • 2000
  • This paper describes the design and the analysis of electromagnetic system of Magnetic Switch using 2D parametric finite element method(EM-Pulse). Magnetic Switch is electrical equipment, which is widely used for switching on/off motors in industrial field. The transient state is simulated in order to calculate the response time of Magnetic Switch. The simulation is based upon a step-by-step integration of the electric circuit equations and the core movement. The contactor uses a permanent magnet for maintaining the closed state. The presented solution takes account of non-linear magnetic material property and spring force controlled by core position. The dynamic response of Magnetic Switch predicted by the simulation agrees closely with the required condition.

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Designing Techniques of PM-type MAGNETIC CONTACTOR (영구자석형 전자접촉기의 설계기법)

  • Cho, Hyun-Kil;Lee, Eun-Woong;Kim, Kil-Su;Kim, Jun-Ho;Jeong, Jong-Ho;Lim, Su-Saeng
    • Proceedings of the KIEE Conference
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    • pp.653-656
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    • 2001
  • This paper describes the design and the analysis of permanent magnetic actuator "Magnetic Switch" using classical method and 2D finite element method. The classical method gives an outline of permanent magnet size and analysis is carried out by finite element method. Therefore we make use of the result in specific detail site of magnet. The transient state is simulated in order to calculate the response time of "Magnetic Switch". The simulation is based upon a step-by-step integration of the electric circuit equations and the tore movement. The contactor uses a permanent magnet for maintaining the closed state. The presented solution takes account of non-linear magnetic material property and spring force controlled by core position. The dynamic response of "Magnetic Switch" is predicted by the simulation agrees closely with the required condition.

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The transient analysis for choosing the optimal SCR ratings of AC3 utilization category testing equipment used for electrical durability test for magnetic switch (IEC60947-4에 따른 전자개폐기 전기적 수명시험설비의 과도현상을 고려한 SCR최적 정격선정에 대한 연구)

  • Ryu Haeng Soo;Kim Kab Dong;Han Gyu Hwan
    • Proceedings of the KIEE Conference
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    • pp.354-356
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    • 2004
  • This paper is the transient analysis for choosing the optimal SCR ratings of AC3 utilization category testing equipment(AC3 TE) used for electrical durability test for magnetic switch according to IEC60947-4 Annex B by utilizing EMTP -ATPDraw. Magnetic contactor closes and opens the motor load with ON/OFF switch of electronic contactor. It is also used for protecting and controlling the load. Magnetic contactor detects the over-current flow in the load with a over-current relay and disconnects the load by opening its control power. The key cost of AC3 TE is the SCR ratings. The more decreases SCR ratings, the more decreased the cost is, but it is impossible to ensure the reliability. On the other hand, the more increases SCR ratings, the more increased the cost is. Thereupon, in this paper after the testing circuit is simulated by using EMTP-ATPDraw the SCR ratings will be applied in order to guarantee the testing reliability of PT&T(Power Testing and Technology institute in LG Industrial Systems Co.,Ltd.).

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Time Estimation of Forming and Extinguishing Arc in the dc Contactor at Opening Contacts (접점 개방시 직류 접촉기의 아크 형성과 소호 시간 예측법)

  • Cho Hyun-Kil;Lee Eun-Woong;Kim Jun-Ho
    • Proceedings of the KIEE Conference
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    • pp.788-790
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    • 2004
  • This paper describes the phenomenon of the molten metal bridge theory of the arc discharge at opening contacts. And we analyze the magnetic force and drag force acting on the arc column in the DC magnetic contactor Arc cooling time by the force convection is calculated in the thermal dynamic equation using mean temperature method. Since arc gas lost conduction characteristics below a such temperature, it verify that the process of forming and extinguishing arc is able to analyze in terms of temperature characteristic by simulation and experiments of the 3 types arc extinction unit. It propose the practical simulation method to improve the electrical endurance of dc contactor.

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