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{|===<!--6.4.2-->Contact Physics – Formulas=== *'''Constriction resistance''' : $R_e = \rho/2a$(Single spot contact according to Holm; circular touching spot between cleancontact surfaces): $R_e = \rho/2Na$(Multi-spot contact according to Holm without influence between the Nindividual spots): $R_e = \rho/2 x \sum a_i + 3 \pi \rho /32N^2 x \sum \sum (s_ij) i \neq j$(Multi-spot contact according to Greenwood considering the influence betweenthe spots) *'''Contact resistance''': $R_K = R_e + R_f$ *'''Path resistance''' : $R_d = R_b + R_K$ |*'''EditorContact resistance and contact force''':$R_K = 280\rho \sqrt[3]{E (F_K \cdot r)} $ |DODUCO Holding GmbH(According to Holm model for film-free spherical contact surfaces with plasticdeformation of the contact material; F<brsub>Im Altgefäll 12k<br/sub>< 1 N for typical contact materials)75181 Pforzheim : $R_K = 9000 \rho \sqrt{ H/ GermanyF_K}$(According to Holm model for film-free spherical contact surfaces with plasticdeformation of the contact material; F<sub>k<br/sub> >5 N for typical contact materials)Phone +49 *'''Dynamic contact separation''' (0without considering magnetic fields caused by the current path) 7231 602-: $F_A \approx 0,8 xl^2$(Rule of thumb with F<sub>A<br/sub>in N and l in kA) Fax +49 *'''Contact voltage and max. contact temperature''': $T_kmax \approx 3200 U_K$ *'''Contact resistance at higher contact forces (0according to Babikow) 7231 602''' : $R_K = cF_k^{-398m}$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%;"
|'''Managing Directors''':!Material combination |Dr. Hans-Joachim Dittloff (Vorsitzender)<br>Dr. Franz Kaspar<br>Hajo Kufahl<br>!c
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|'''Registration''':Copper - Copper |HRB 710592 AG Mannheim(0.08 bis 0.14) x 10<sup>-3</sup>
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|'''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
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|Flat – Flat
|1
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|Pyramid – Flat
|0.5
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|Sphere – Flat
|0.6
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|Sphere – Sphere
|0.5
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|Multi-strand brush - Flat
|1
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|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]]
