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Electrical Questions for Skrap and AS-EE - 10/3/2005 2:22 AM   
sleepy23



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Status: offline 		Hey guys,
Since two are the resident electrical experts..i have a question or two i would like to ask:

1. if price wasnt an issue, what is the most conductive, least resistance wire that can be purchased? this would be for like motor and battery connections from and esc

2. anyone know of a good cheap source to get some of the two sided thermal transfer tape?

3. would i benefit from increasing the size of the wires than frun from the esc to the receiver?

i think that covers it...
thanks

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 2:29 AM   
bIGmiK



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Status: offline 		not 100% sure but im 75% sure these are right.

1. gold wire.

2. no idea.

3. you will only benifit IF more electrons are trying to pass through the wire than can fit, causing a bottlenose affect.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 3:29 AM   
XXT-CRer


 

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Status: offline 		as for wire that is practical, im sure its gonna be copper, and i bet they mention size, and number of conductors. im interested to see what they say myself, so BUMP.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 4:31 AM   
AS-EE


 

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quote:

if price wasnt an issue, what is the most conductive, least resistance wire that can be purchased? this would be for like motor and battery connections from and esc


Stay with copper. Although silver and gold are better conductors, the price just does not justify its use in the R/C realm. If you want to lower the resistances for wires then use much larger diameter size wire. Also try to keep the distance of the wires as short as possible as this too helps cut down on the resistances.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 4:41 AM   
bIGmiK



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Status: offline 		he said with no price limit, so i told him the best.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 8:00 AM   
michelob78



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Status: offline 		Silver is the best conductor.
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Prob wont notice that much of a difference, do your current wires get hot or warm? prob not they can handle more, bigger wire will reduce ohms by a very small amount i doubt you would notice. use ohms law to calculate E=IxR,12 gauge is .00187 per foot and 16 is .00473. The voltage drop across the wires is what concerns you find the current draw of your motor i'll use 30 amps for simplicity so 30x.00187=.0561 voltage lost at wire. 30x.00473=.1419 a difference of .0858v not a heck of alot, if you are squeezin every last drop of power from batts maybe

< Message edited by michaelob78 -- 10/3/2005 8:09 AM >

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 12:24 PM   
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Status: offline 		Thermal transfer tape is available from computer stores I believe - check like newegg.com - they also have thermal paste which does the same thing...

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 12:49 PM   
SkrapIron



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Status: offline 		Dang,

I need to quit sleeping. Yeah, what they said.

Element Electrical resistivity (microohm-cm)

Aluminum 2.655
Copper 1.678
Gold 2.24
Silver 1.586
Platinum 10.5

As you can see from the chart, Silver is the least resistive to current flow, with copper being a close second.

The most efficient use of wire is a to choose the thickest gauge that is practical, over the shortest distance possible. In our hobby grade motors, it is likely that you would see a few extra RPM out of the motor, by changing the type, gauge, and run of the cables. I doubt that it would really be noticible anywhere but on a dynometer.

As for the thermal transfer tape, I think you can pick that up at Radio Shack. I have to pick up some stuff today, so I'll check there for ya!

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 2:40 PM   
sleepy23



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Status: offline 		Thanks guys, i appreciate the info as i have NO electrical inclinations ( i hated the two circuits classes i had to take).
To answer some of the questions...my wires dont get hot at all. W/o being able to look, i think i have 14 ga on my mgm controller (only cuz they didnt recommend switching it out) and then 12ga Deans wire on my novak system. I just wanted to know what the best wire was cuz i am always looking to improve performance if only by a few rpm.
My radioshack didnt have the heat tape. I have some of the paste, but it doesnt work too well with the application ( holding on a custom heatsink for my mgm controller) and it attracts dirt and just makes a mess. I dont like my cars looking like crap, i run em, i clean, and they typically are very well laid out, the poaste just messes it all up.

thanks again, i will do some searching for some wire and/or see if we have some here at work.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 2:47 PM   
bIGmiK



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Status: offline 		silicon wiring is the only way to go.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 3:00 PM   
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Status: offline 		thats pretty interesting scrap. i bet the gold being higher resistance than copper will surprise some folks.ive never actually looked up the conductivity of the various metals, but i knew silver would be way up there cuz they use it for contacts in large motor starters in my trade.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 3:03 PM   
bIGmiK



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Status: offline 		i was told gold how the lowest resistance, but i spose the person who told me was wrong.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 4:37 PM   
NitroStar



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Status: offline 		1. The Deans 12 ga. wire is very flexible and is great for RC applications. Or any popular RC brand of 12 "silicone" wire. The silicone refers to the soft insulation making it more flexible than other 12 ga wire which matters greatly in small places.

2. Comp USA or any small computer store down the street. Try to get 3M brand. Any of it will be inexpensive.

3. Unless the wire from the ESC to the reciever is old, brittle or nicked, you would not benefit from going larger cause you still have to connect them to the small terminals in the reciever plug.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 5:33 PM   
ETRNL



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Status: offline 		wow.. i have a degree in Automated Industrial Process Control Theory and we were taught that platinum is the best conductor as far as connections go, most PLC's (programmable logic controllers) connections and adapters have platinum plated connectors. And in the military most of the connectors, plugs, relays, missile buffers, missile umbilicals, all of the weapons system connections, ( at least on the F-16) are gold plated..... why would the military spend more money on gold if silver is more conductive.....( oh.... it the military.. ) anyways im not trying to disagree put i looked it up and Skrappys right. i was just surprised at the rating.. all this time i thought platinum was the best...

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 5:48 PM   
SkrapIron



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Status: offline 		Platinum is used because it has the highest corrosion resistance of all the rare-metals. It has nothing to do with conductivity, it's all about longevity.

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RE: Electrical Questions for Skrap and AS-EE - 10/3/2005 6:08 PM   
AS-EE


 

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Status: offline 		Yep, silver and copper are not very corrosion resistance. So for circuit board cards that plug into ports, gold would be a good choice.

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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 2:07 AM   
michelob78



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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 2:17 AM   
MBX5T Maniac



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Status: offline 		i think i will try the platnum wire!

he he

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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 2:21 AM   
michelob78



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Status: offline 		I doubt it platinum is more expensive than gold

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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 3:30 AM   
zaphod42



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Status: offline 		Don't forget your solder connections if you are really trying to reduce your resistance. Standard electronics solder is usually 63% Tin and 37% lead (or thereabouts) and doesn't make the lowest resistance connection available. With the government trying to get rid of lead in everything (it is, after all, a deadly poison) there are silver solders popping up everywhere. I have been using the 96% tin and 4% silver stuff you can get at Radio Shack. It doesn't flow as well but it make a higher strength and lower resistance connection (if only by a few microOhms).

By the way, if you are attaching the heatsink permanently (IE: it will NEVER need to be removed) you could try JB Weld - it conducts heat way better than those thermal tapes. Just don't get it on anything you don't want to be electrically conductive. If you'd prefer something more 'elegant' than JB Weld then Loctite makes a line of thermally conductive epoxies that work quite well - here is a link to one example: http://www.contacteast.com/product/group.asp?parent_id=11487 They make several compounds for different applications.

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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 3:46 AM   
sleepy23



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Status: offline 		well i already use deans racing colder, deans 12ga wire, deans connectors... so there is not a weak spot in my setup, i just like pushing the limits.
as for the thermal tape, i plan on sticking with that or a combo of that and heat transfer paste. the beautiful part of that is i can change out my custom heatsinks as i need too. the problem with the paste only is that it allows the heat sink to slide around. if i can lock it down, then i am going to have some killer heatsinks on my esc and motor..(superlite heatsinks )

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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 4:10 AM   
zaphod42



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Status: offline 		Some of the Loctite thermal adhesives are semi-permanent (IE: removable). They have more strength than the tape and conduct heat better but you can still get them off. They are, however, pricey and if what you're doing is working for you then stick with it.

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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 10:19 AM   
ETRNL



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Status: offline 		this is turning out to be a very informative thread. im learning new things. im glad there are seasond pros here. now only if soldering was as easy as welding..

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RE: Electrical Questions for Skrap and AS-EE - 10/4/2005 4:04 PM   
sleepy23



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Status: offline 		you must be kidding....soldering is alot easier than welding and you dont have to worry bout welding sunburn, do not need a welding hood, and really dont have to wear any kind of protective gear (which you would wear if welding correctly)

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RE: Electrical Questions for Skrap and AS-EE - 10/5/2005 12:01 AM   
ETRNL



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Status: offline 		well i can weld in my sleep. but soldering just kicks my a$$. i dont know why.. maybe cause my gun sucks.. but yes i have a major problem soldering... and no im not kidding..

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