Electrical Slip Ring Technology Research – Contact Resistance
Submitted by: Submitted by noblex
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Pages: 3
Category: Business and Industry
Date Submitted: 10/05/2015 02:19 AM
Slip ring technology is widely used in celestial navigation, optical tracking, optical measurement,
optical search devices and automated machinery. In this article, experimental and engineering
analysis of contact resistance and insulation properties of the electrical slip ring.
1. The contact resistance of the slip ring
If the contact resistance of the conductive slip ring is large, the current through the contact point
relative temperature will be high, may even cause the wire brush and slip ring welding, while the
contact pressure increases, these will affect the information transfer effect, and therefore the
better the smaller of contact resistance. Factors that affect the size of the contact resistance
include: a contact portion of the material, the form of the contact surface and the contact
pressure.
Select the contact portions of the material
Slip ring made of a conductive ring and wire brush the two main parts. Its main properties are:
high conductivity, good thermal conductivity, high melting point, small resistance temperature
coefficient (has antioxidant, anti-sulfide, anti-corrosive gases and other characteristics); has a
certain hardness, wear resistance and other characteristics. After testing, the choice of brass
conductive ring better, you can use gold wire brush nickel wire, nickel gold wire but is
expensive, generally used in beryllium (QBe2), in addition, can also choose brass plated layer of
palladium on the surface meet good electrical properties, have a good anti-corrosion effect.
Contact style of wire brush and slip ring
Contact style of point contact and surface contact, general slip rings are point-contact. Contact
resistance of point contact is small, because the contact area is small, small current through, after
several tests, the maximum current is not more than 10 amps, if the slip ring to transfer current of
more than 10 amps, you should consider taking surface contact type. Surface contact type require...
