Carbon brushes & sliprings

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Anonymous Poster	Carbon brushes & sliprings 12/20/2008 2:11 PM
	hi friends, I am not from purely electrical field. I have some doubts about brush & sliprings.Please tell something about purpose of carbon brushes & sliprings in motors. Also about material of brushes. Thanks in advance
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#1 Re: Carbon brushes & sliprings 12/20/2008 3:50 PM
	Slip rings simply allow you to connect wires to a rotating part, if you didn't use slip rings the wires would get twisted round the shaft and break. Brushes on a comutator do a slightly different task, as well as connecting to rotating parts, the 'ring' part is cut into sections such that the brush connects to a different coil as the commutator rotates. Del __________________ health warning: These posts may contain traces of nut.
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garth Guru Join Date: Sep 2006 Location: NSW Australia Posts: 1101 Good Answers: 23	#2 Re: Carbon brushes & sliprings 12/21/2008 6:43 AM
	Brushes are formulated with mixtures of carbon,graphite, copper, silver and probably a few more but these are the main groups. The mixtures depend on voltage and current carrying capacity also duty cycle and-ability to withstand wear for the particular application. __________________ Dont get on to the roundabout if you dont know how to get off
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sijin Participant Join Date: Dec 2008 Posts: 1	#3 Re: Carbon brushes & sliprings 12/21/2008 7:40 AM
	Daer friend, AC machine need DC supply for magnetic field, located in rotor. We cant give supply through wire to a rotating equipment, so we esu a sliding contact. Brushes touches on round slip ring located on rotor. Brushes are on stator and connected to DC supply. Graphite.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#4 Re: Carbon brushes & sliprings 12/23/2008 11:47 AM
	Try removing a simple DC motor from an unwanted battery-operated toy, and dissecting it. The purpose of both will be revealed. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#5 In reply to #4 Re: Carbon brushes & sliprings 12/23/2008 11:52 AM
	Unwanted/broken. So that's scheduled for boxing day then? __________________ health warning: These posts may contain traces of nut.
	Reply Off Topic (Score 5)

Anonymous Poster	#6 Re: Carbon brushes & sliprings 11/30/2010 6:31 AM
	there are several type of brushes with different specificationes that are selected for electrical machines due to current , voltage and speed and also material of slipring and climate. 1 hard carbon 2 carbon graphite 3 resin-bonded graphite 4 electrographite 5 metal graphite www.industrialgraphite.com more information on carbon brushes
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Anonymous Poster (1); garth (1); PWSlack (1); sijin (1); user-deleted-1105 (2)

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