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Old Jan 17, 2013, 09:02 PM
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Lafayette, Louisiana
Joined Dec 2005
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Question
Can I make my motor wires 30"-40" Long?

Can I make the brushless motor wire 30-40" long?
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Last edited by jonathan7x70; Jan 17, 2013 at 10:02 PM.
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Old Jan 17, 2013, 10:02 PM
President @ Acadian RC Club
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Lafayette, Louisiana
Joined Dec 2005
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Thanks in advance
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Old Jan 17, 2013, 10:43 PM
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I've run with motor wires in excess of 30" long with no problems except for some power loss. If you try to run battery wires that long you'll blow the esc unless you add lots of capacitance.
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Old Jan 17, 2013, 11:40 PM
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thanks bob
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Old Jan 17, 2013, 11:43 PM
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Lafayette, Louisiana
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If I am reading right.... If I keep the same quality wire and make the gauge heavier (ex. if 14g then make it 10g) It will help with power loss and keep it to a minimum.
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Old Jan 18, 2013, 12:54 AM
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check the blog http://circuitcalculator.com/wordpre...rs-calculation

Larger wires are an issue of weight vs. performance gain. The calculator in the blog lets you make some of those tradeoffs.

Bob
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Old Jan 18, 2013, 05:36 AM
222 km/hr Parkjet flyer
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Latvia, Ventspils pilsēta, Ventspils
Joined Jan 2010
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I use copper household stiff wire as my extenders for motor wires. I trade weight for minimum voltage drop and also the wires can be bent permanently to suit installation.
I remove the white outer insulation and separate the individual leads still with their own insulation intact. A single turn of insulation tape at intervals is all needed to tidy them up ... a small blob of Hot glue to tack in place.

Depending on the model - I either solder the ESC wires to the extensions or use bullets ... and bullets at motor end.

So far no problems with this ... one EDF is running 5S to a 3200kv 70mm unit at over 25" extension ... with no discernible difference to when tested without extension.

Nigel
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Old Jan 18, 2013, 01:31 PM
President @ Acadian RC Club
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Lafayette, Louisiana
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I am not worried about weight. Its a 100" span plane that specs at 20lbs and I all ready built it ready to fly at 14-15Lbs... Dont think Ill be adding 5lbs of wire.

SOoooo. What is the best wire for least amount of either voltage / performance drop?
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Old Jan 18, 2013, 07:15 PM
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United States, CA, Bear Valley Springs
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What amp draw do you expect? I kinda like Nigel's solution. Simple.
I'd use 12awg in general.

mw
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Old Jan 18, 2013, 08:04 PM
222 km/hr Parkjet flyer
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My usual solid copper is 1.5mm for low power stuff and 2mm for higher draw ..

Basically it all started because my house is being rebuilt and electrics redone ... loads of cable left over. For my high demand 70mm EDF - I use the cable that is supplying main feed to a ring main ... so that is capable of carrying serious load .. probably 2.5mm

For my other - I use cable that is from wiring rooms and is 1.5mm - 2mm ...

I have tested with and without the extensions and i see no discernible drop in power - volts or amps with or without. As I say - I always make sure the extension wire is greater diameter than the ESC leads ... as long as I see that - i don't worry about gauge of wire.

Nigel
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Old Jan 27, 2013, 01:00 PM
President @ Acadian RC Club
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Lafayette, Louisiana
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Quote:
Originally Posted by solentlife View Post
My usual solid copper is 1.5mm for low power stuff and 2mm for higher draw ..

Basically it all started because my house is being rebuilt and electrics redone ... loads of cable left over. For my high demand 70mm EDF - I use the cable that is supplying main feed to a ring main ... so that is capable of carrying serious load .. probably 2.5mm

For my other - I use cable that is from wiring rooms and is 1.5mm - 2mm ...

I have tested with and without the extensions and i see no discernible drop in power - volts or amps with or without. As I say - I always make sure the extension wire is greater diameter than the ESC leads ... as long as I see that - i don't worry about gauge of wire.

Nigel
Still only on the motor side.. the 3 wires... the AC side... not the DC,battery side.. right?

I did the AC side, motor side at 35" on 10 gauge. Did not notice any power loss or performance loss.. works fine. I used high strand count flexible silicon wire. Pulling about 60amps max and 30-40 Continuous.
When I first did it I did the battery side... + & -.... @ 35" even on 10 gauge at 60 amps the wire got warm and motor had problems with timing. The motor side worked fine.

Now what the best way for the motor side wiring I dont know but it worked so.

I would still like to do the best way even if it works because I want it to be as efficient as possible.
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Old Jan 29, 2013, 05:25 AM
222 km/hr Parkjet flyer
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Latvia, Ventspils pilsēta, Ventspils
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Yes AC side is correct ... I try to leave ESC to Battery side as is to prevent issues.

Nigel
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