Editing Slip ring (section)

=== Wireless slip rings ===
{{Main|Rotary transformer}}
Wireless slip rings do not rely on the typical friction-based metal and carbon brush contact methods that have been employed by slip rings since their invention, such as those explored above. Instead, they transfer both power and data wirelessly [[Electromagnetic induction|via a magnetic field]], which is created by the coils that are placed in the rotating receiver, and the stationary transmitter.<ref>{{Cite news|url=http://powerbyproxi.com/slip-ring/|title=Slip Rings {{!}} How Does a Slip Ring Work • PowerbyProxi|newspaper=PowerbyProxi|language=en-US|access-date=2016-11-24|archive-date=2016-11-24|archive-url=https://web.archive.org/web/20161124203817/http://powerbyproxi.com/slip-ring/|url-status=dead}}</ref> Wireless slip rings are considered an upgrade from&nbsp;— or alternative to&nbsp;— traditional slip rings, as their lack of standard mechanical rotating parts means they are typically more resilient in harsh operating environments and require less maintenance. However, the amount of power that can be transmitted between coils is limited; typically a traditional contact-type slip ring can transmit orders of magnitude more power in the same volume.