Difference between revisions of "General Rules for Dimensioning of Contacts"
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− | ===6.4.6 General Rules for Dimensioning of Contacts=== | + | ===<!--6.4.6-->General Rules for Dimensioning of Contacts=== |
− | + | '''Recommended Minimum Contact Forces at Slightly Sliding Contact Make:''' | |
− | + | <table class="twocolortable" style="text-align: left; font-size: 12px;width:40%"> | |
− | + | <tr> | |
− | + | <td>Gold</td> | |
− | + | <td>0.03 N </td> | |
− | + | </tr><tr> | |
− | + | <td>Silver </td> | |
− | + | <td>0.1 N</td> | |
− | + | </tr><tr> | |
− | + | <td>Tungsten </td> | |
− | + | <td>0.5 N</td> | |
− | + | </tr> | |
− | + | </table> | |
− | + | '''Contact Force Recommendations:''' | |
{| class="twocolortable" style="text-align: left; font-size: 12px;width:40%" | {| class="twocolortable" style="text-align: left; font-size: 12px;width:40%" | ||
Line 46: | Line 46: | ||
− | + | '''General Rules for Dimensioning of Contact Rivets''' | |
− | + | ||
+ | [[File:General Rules for Dimensioning of Contact Rivets.jpg|left|thumb|Figure 1: General Rules for Dimensioning of Contact Rivets]] | ||
+ | {| class="twocolortable" style="text-align: left; font-size: 12px;width:100%" | ||
+ | |- | ||
+ | !Dimensioning | ||
+ | !Solid Rivets (1) | ||
+ | !Composite Rivets (2) | ||
+ | |- | ||
+ | |a : d | ||
+ | |1.5 : 1 bis 2.5 : 1 | ||
+ | |2 : 1 bis 2.5 : 1 | ||
+ | |- | ||
+ | |a : b | ||
+ | |2.5 : 1 bis 10 : 1 | ||
+ | |3 : 1 bis 5 : 1 | ||
+ | |- | ||
+ | |c : b | ||
+ | |≥ 1 : 1 | ||
+ | |≥ 1 : 1 | ||
+ | |- | ||
+ | |b : s | ||
+ | | | ||
+ | |≥ 2 : 1 | ||
+ | |- | ||
+ | |s<sub>min</sub> | ||
+ | | | ||
+ | |≈ 0.3 mm | ||
+ | |} | ||
+ | |||
+ | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | + | '''Failure Probability of Single and Double (Bifurcated) Contacts''' (according to Thielecke) | |
− | + | {| class="twocolortable" style="text-align: left; font-size: 12px;width:100%" | |
− | + | |- | |
− | + | !Contact force[N] | |
− | + | !colspan="4" style="text-align:center"|'''Single contact''' | |
+ | |- | ||
+ | ! | ||
+ | !Ag | ||
+ | !AuNi 5, Pt | ||
+ | !Ag | ||
+ | !AuNi 5, Pt | ||
+ | |- | ||
+ | |0.04 | ||
+ | | | ||
+ | |1 x 10<sup>-4</sup> | ||
+ | | | ||
+ | |2 x 10<sup>-8</sup> | ||
+ | |- | ||
+ | |0.1 | ||
+ | |2 x 10<sup>-3</sup> | ||
+ | |4 x 10<sup>-5</sup> | ||
+ | |8 x 10<sup>-5</sup> | ||
+ | |8 x 10<sup>-9</sup> | ||
+ | |- | ||
+ | |0.2 | ||
+ | |1 x 10<sup>-4</sup> | ||
+ | |8 x 10<sup>-6</sup> | ||
+ | |4 x 10<sup>-6</sup> | ||
+ | |4 x 10<sup>-8</sup> | ||
+ | |- | ||
+ | |0.3 | ||
+ | |5.5 x 10<sup>-6</sup> | ||
+ | |1.5 x 10<sup>-6</sup> | ||
+ | |1.8 x 10<sup>-7</sup> | ||
+ | |3.2 x 10<sup>-10</sup> | ||
+ | |} | ||
− | |||
− | + | <div class="multiple-images"> | |
− | function of the voltage (according to Kirchdorfer); | + | <figure id="fig:Failure probability of a contact as a function of the voitage"> |
− | Ag/Ni10; 10 mA | + | [[File:Failure probability of a contact as a function of the voitage.jpg|left|thumb|Figure 2: Failure probability of a contact as a function of the voltage (according to Kirchdorfer); Ag/Ni10; 10 mA]] |
+ | </figure> | ||
− | + | <figure id="fig:Failure probability of a contact as a function of the current"> | |
− | function of the current (according to | + | [[File:Failure probability of a contact as a function of the current.jpg|left|thumb|Figure 3: Failure probability of a contact as a function of the current (according to Kirchdorfer); Ag/Ni10; F<sub>k</sub> = 0.45 N; U = 24 V]] |
− | Kirchdorfer); Ag/Ni10; F = 0.45 N; U = 24 V | + | </figure> |
+ | </div> | ||
+ | <div class="clear"></div> | ||
==References== | ==References== | ||
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]] | [[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]] | ||
+ | |||
+ | [[de:Faustregeln_für_die_Kontaktdimensionierung]] |
Latest revision as of 13:01, 26 January 2023
General Rules for Dimensioning of Contacts
Recommended Minimum Contact Forces at Slightly Sliding Contact Make:
Gold | 0.03 N |
Silver | 0.1 N |
Tungsten | 0.5 N |
Contact Force Recommendations:
Signal relays | ≥ 3 cN |
AC power relays | ≥ 20 cN |
Automotive relays | ≥ 20 cN |
Motor switches (Contactors) (Silver – Metal oxide contacts) |
0.05 - 0.08 N/A |
Power switches | 0.1 - 0.2 N/A |
Connectors (Gold coating) |
≥ 30 cN/contact element |
Connectors (Silver coating) |
≥ 50 cN/contact element |
Connectors (Tin coating) |
≥ 1 N/contact element |
General Rules for Dimensioning of Contact Rivets
Dimensioning | Solid Rivets (1) | Composite Rivets (2) |
---|---|---|
a : d | 1.5 : 1 bis 2.5 : 1 | 2 : 1 bis 2.5 : 1 |
a : b | 2.5 : 1 bis 10 : 1 | 3 : 1 bis 5 : 1 |
c : b | ≥ 1 : 1 | ≥ 1 : 1 |
b : s | ≥ 2 : 1 | |
smin | ≈ 0.3 mm |
Failure Probability of Single and Double (Bifurcated) Contacts (according to Thielecke)
Contact force[N] | Single contact | |||
---|---|---|---|---|
Ag | AuNi 5, Pt | Ag | AuNi 5, Pt | |
0.04 | 1 x 10-4 | 2 x 10-8 | ||
0.1 | 2 x 10-3 | 4 x 10-5 | 8 x 10-5 | 8 x 10-9 |
0.2 | 1 x 10-4 | 8 x 10-6 | 4 x 10-6 | 4 x 10-8 |
0.3 | 5.5 x 10-6 | 1.5 x 10-6 | 1.8 x 10-7 | 3.2 x 10-10 |