Difference between revisions of "Contact Physics – Formulas"
From Electrical Contacts
Doduco Admin (talk | contribs) |
Doduco Admin (talk | contribs) |
||
Line 16: | Line 16: | ||
*'''Path resistance''' | *'''Path resistance''' | ||
− | : <math> | + | : <math>R_d = R_b + R_K</math> |
*'''Contact resistance and contact force''' | *'''Contact resistance and contact force''' |
Revision as of 11:14, 31 March 2014
6.4.2 Contact Physics – Formulas
- Constriction resistance
(Single spot contact according to Holm; circular touching spot between clean contact surfaces)
(Multi-spot contact according to Holm without influence between the N individual spots)
(Multi-spot contact according to Greenwood considering the influence between the spots)
- Contact resistance
- Path resistance
- Contact resistance and contact force
(According to Holm model for film-free spherical contact surfaces with plastic deformation of the contact material; Fk < 1 N for typical contact materials)
(According to Holm model for film-free spherical contact surfaces with plastic deformation of the contact material; Fk > 5 N for typical contact materials)
- Dynamic contact separation (without considering magnetic fields caused by the current path)
(Rule of thumb with FA in N and l in kA)
- Contact voltage and max. contact temperature
- Contact resistance at higher contact forces (according to Babikow)
For FK between 10 and 200 N
c = material dependent proportionality factor
m = shape dependent exponent of the contact force