NDLI: Simulation of the heat transfer mechanism in relays to improve contact reliability at freezing temperatures

Content Provider	IEEE Xplore Digital Library
Author	Volm, D. Walesch, R. Bachmann, A.
Copyright Year	2004
Description	Author affiliation: Matsushita Electr. Works, Holzkirchen, Germany (Volm, D.; Walesch, R.; Bachmann, A.)
Abstract	Computer simulations of thermodynamic processes optimally expand the alternatives available for experimental technology and thereby reveal problems at critical temperatures already at the developmental or design-in stage. In many cases, knowing the thermal efficiency within a relay can help to avoid switching problems. It is well known that at low temperatures, residual dampness in the relay or its materials can condense on the relay contacts. The speed of the cooling processes plays an important role in this respect. That condensation, at low temperatures, leads to ice formation and to an unstable or high-impedance contact resistance. Obviously this phenomenon depends on many parameters: besides load current and coil efficiency, the connection to the PCB plays a decisive role. In the following article, the thermal efficiency of a relay to be used at low temperatures and small load currents are calculated according to the finite element method. In several steps, the relevant influential variables are determined and the design thereby optimised. Comparative electrical and temperature measurements are also drawn upon to verify the simulation.
Sponsorship	Components, Packaging, and Manuf. Technol. Soc. of the Inst. of Electr. and Electron. Eng., Inc
Starting Page	488
Ending Page	493
File Size	850760
Page Count	6
File Format	PDF
ISBN	0780384601
DOI	10.1109/HOLM.2004.1353161
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heat transfer Relays Temperature Computational modeling Computer simulation Thermodynamics Cooling Ice Contact resistance Coils
Content Type	Text
Resource Type	Article

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