Design of an estimator of the kinematics of AC contactors

Abstract-The undesirable phenomenon of the contact bounce causes severe erosion of the contacts and, as a consequence, their electrical life and reliability are greatly reduced. On the other hand, the bounce of the armature can provoke re-opening of the contacts, even when they have already been closed. This paper deals with the elimination of the bounce in both contacts and armature of a commercial dc core contactor. This is achieved by means of a current closed-loop controller, which only uses as input the current and voltage of the contactor's magnetizing coil. The logic control has been implemented in a low cost microcontroller. Moreover, the board control can be fed by either dc or ac, and either in 50 Hz or 60 Hz so as to extend its applicability. A set of data is obtained from the measurement of the position and velocity of the movable parts for different operating voltages, and the dynamic behavior of the contactor is discussed.

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“…The magnetizing inductance of a U-shape contactor is related to the position of the moving armature [23]- [25] as follows:…”

Section: A Position Observermentioning

confidence: 99%

Closed-Loop Controller for Eliminating the Contact Bounce in DC Core Contactors

Espinosa¹,

Riba²,

Cusidó³

et al. 2010

IEEE Trans. Comp. Packag. Technol.

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“…So this nature of N atom has the greatest effect on yield strength among other alloying elements. The atomic size of nitrogen was small when compared with that of iron, chromium and nickel making it as an interstitial element in steel [3]. In some cases the nitrogen was used as a replacement element for nickel in medical applications.…”

Section: Introductionmentioning

confidence: 99%

“…The nitrogen was used as the alloying element in WC9 steel because the addition of nitrogen increases the mechanical properties of the alloy linearly. The nitrogen was added to the alloy in solid form as nitride ferrochrome which had 60% Cr, 6% N and 0.1% C. At 0°C the density of nitrogen was 1.25 g/cm 3 which was very much less than the base alloy [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Nitrogen as an Alloying Element in WC9 Grade Steel

Vishnuh

Sudhakar

Tamilarasu

et al. 2017

Archives of Metallurgy and Materials

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In the present work the effect of nitrogen on WC9 alloy at various weight percentages was analyzed and tested for their microstructural and mechanical properties. The nitrogen was added at 0.05, 0.10, 0.15, 0.20 and 0.25 wt. % in the solid form as nitrided ferrochrome to WC9 alloy. The samples were heat treated by solution annealing process at a temperature of 1100°C for 5 hours to improve the austenitic formation. Microstructures and mechanical properties such as tensile strength, yield strength, hardness, % elongation and % reduction of WC9-N alloy were examined. It was observed that increasing nitrogen wt. % increases the mechanical properties. The obtained mechanical properties were compared with base WC9 and C12A grade steel, where it was found to be replacement for C12A grade steel at its composition at lower end. The material cost analysis for WC9-N and C12A grade steel was done and both were compared.

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“…It is an undesirable marvel, which brings about a re-opening of the contacts, creating the ghost of an electric circular segment until the contact makes unquestionably [2]. The curve can bring about extreme contact disintegration, and consequently the electrical life and unwavering quality of the contacts are drastically decreased [3,4]. An ascent in the contact temperature causes a more noteworthy increment in the contact resistance.…”

Section: Introductionmentioning

confidence: 99%

Parameter Characterization in Processing of Silver – Aluminum Based Electrical Contact Materials

Kumar¹,

Parameshwaran²,

Ananthi³

et al. 2017

Archives of Metallurgy and Materials

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An electrical contractor is one which plays significant role in day todays life in industries as well as in home appliances. In current scenario the materials for conducting purpose has an overwhelming research capability. Now a day the silver based electrical contact composite material have provided the potential applications in aerospace and automobile industries. Among silver based contact material the silver cadmium oxide and silver tin oxide plays a vital role in fabrication of electrical contactors. In this research an attempt has been made to study the influence of adding Aluminum with silver based electrical contact composite materials by two different processing routes namely stir-casting and powder metallurgy. Silver and aluminum matrix plays a virtual role in composite world owing to their highest conductivity. Optimum parameters were identified for attaining the maximum properties such as conductivity, hardness, density, and porosity of composition. By this better conducting property and mechanical property of the electrical contact can be improved by this system. Thus a screening test has be conducted with addition of Al with silver tin oxide compositions hence this paper aims to process the aluminum -silver based electrical contact materials by stir casting processing and powder metallurgy route and compare the results obtained.

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Design of an estimator of the kinematics of AC contactors

Cited by 5 publications

References 31 publications

Closed-Loop Controller for Eliminating the Contact Bounce in DC Core Contactors

Closed-Loop Controller for Eliminating the Contact Bounce in DC Core Contactors

Experimental Analysis of Nitrogen as an Alloying Element in WC9 Grade Steel

Parameter Characterization in Processing of Silver – Aluminum Based Electrical Contact Materials

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