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Contact Physics – Formulas

89 bytes added, 12:33, 7 February 2019
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{|===<!--6.4.2-->Contact Physics – Formulas=== |*'''EditorConstriction resistance''':<math>R_e = \rho/2a</math>|DODUCO Holding GmbH(Single spot contact according to Holm; circular touching spot between cleancontact surfaces): <math>R_e = \rho/2Na</math>(Multi-spot contact according to Holm without influence between the Nindividual spots): <math>R_e = \rho/2 x \sum a_i + 3 \pi \rho /32N^2 x \sum \sum (s_ij) i \neq j<br/math>Im Altgefäll 12(Multi-spot contact according to Greenwood considering the influence betweenthe spots) *'''Contact resistance''': <math>R_K = R_e + R_f<br/math>75181 Pforzheim *'''Path resistance''' : <math>R_d = R_b + R_K</ Germanymath> *'''Contact resistance and contact force''': <brmath>R_K = 280\rho \sqrt[3]{E (F_K \cdot r)} </math>Phone +49 (0According to Holm model for film-free spherical contact surfaces with plasticdeformation of the contact material; F<sub>k</sub> < 1 N for typical contact materials) 7231 602: <math>R_K = 9000 \rho \sqrt{ H/ F_K}</math>(According to Holm model for film-free spherical contact surfaces with plasticdeformation of the contact material; F<sub>k</sub> > 5 N for typical contact materials) *'''Dynamic contact separation''' (without considering magnetic fields caused by the current path) : <math>F_A \approx 0,8 xl^2</math>(Rule of thumb with F<sub>A</sub> in N and l in kA) *'''Contact voltage and max. contact temperature''': <math>T_kmax \approx 3200 U_K<br/math>Fax +49 *'''Contact resistance at higher contact forces (0according to Babikow) 7231 602''' : <math>R_K = cF_k^{-398m}</math>For F<sub>K</sub> between 10 and 200 N<br/>Mail: info@doduco.netc = material dependent proportionality factor<br/>m = shape dependent exponent of the contact force  {| class="twocolortable scalable" style="text-align: left; font-size: 12px; width:45%;"
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|'''Managing Directors''':!Material combination |Dr. Hans-Joachim Dittloff (Vorsitzender)<br>Dr. Franz Kaspar<br>Hajo Kufahl<br>!c
|-
|'''Registration''':Copper - Copper |HRB 710592 AG Mannheim(0.08 bis 0.14) x 10<sup>-3</sup>
|-
|'''Consulting and Realisation''':Aluminum - Aluminum|Steinbeis - Transferzentrum Unternehmensentwicklung an der Hochschule Pforzheim (SZUE3 bis 6,7)x 10<brsup>Blücherstraße 32 -3<br>75177 Pforzheim <br/sup>https://www.szue.de/
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|'''Revision and German version''':Brass - Brass |Christian Teitscheid - Teitscheid Freelance IT0.67 x 10<brsup>Barbarastraße 22 -3<br>47495 Rheinberg <br/sup>http://www.teitscheid-freelance.de/
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|Steel – Silver
|0.06 x 10<sup>-3</sup>
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|Steel – Copper
|3.1 x 10<sup>-3</sup>
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|Steel – Brass
|3.0 x 10<sup>-3</sup>
|}
 
{| class="twocolortable scalable" style="text-align: left; font-size: 12px; width:45%; "
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!Contact shapes
!m
|-
|Flat – Flat
|1
|-
|Pyramid – Flat
|0.5
|-
|Sphere – Flat
|0.6
|-
|Sphere – Sphere
|0.5
|-
|Multi-strand brush - Flat
|1
|-
|Current bar (Busbar) contact
|0.5 - 0.7
|}
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==References==
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
 
[[de:Formeln_aus_der_Kontaktphysik]]
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