Current draw of a 3511KV 5407L with no load on 2s or 3s lipo? Need some help here.

[littlegiant]

Originally Posted by hemiblas

Sorry it took me so long. 3.4A on 2S, 5A on 3S.

Ok that's a 5407L right?

I guess my feigao is working fine. Max current draw on a 1/10 buggy was 33A on 3S sounds ok right? Race track will be different I understand.

[J57ltr]

So what is the test procedure for idle current?

Jeff

[littlegiant]

Originally Posted by J57ltr

So what is the test procedure for idle current?

Jeff

Hook the esc up to a wattmeter and apply full throttle. Check the amp reading.

The motor must be without any load (free load)

[zeropointbug]

Well, it's a very complex and time consuming procedure, where you take any load off the motor and run the thing WOT and measure the currents using an eagletree or similar unit. Now, this is only for the non faint of heart and experienced RCist.

[hemiblas]

Woops, you know what, it an 8L purple feigao. Sorry about that. I can only read the 77A max sticker and the .0076 ohm on it which I think corresponds to an 8L motor. So a 7L would be higher than what I gave you. Ya I just hooked up my wattmeter and let it run full blast for a couple of seconds. I tried a couple times to be sure, but you dont want to run these things unloaded for too long.

33A peak on 3S sounds fine. In fact that might be a bit low. I'm assuming its a light buggy to get that number. But ya looks like it is ok.

[J57ltr]

Originally Posted by zeropointbug

Well, it's a very complex and time consuming procedure, where you take any load off the motor and run the thing WOT and measure the currents using an eagletree or similar unit. Now, this is only for the non faint of heart and experienced RCist.

Well I didn't know, I didn't think you were supposed to run them at full throttle without a load (though I have done it), and idle to me means low rpm.

Jeff

[littlegiant]

Originally Posted by J57ltr

Well I didn't know, I didn't think you were supposed to run them at full throttle without a load (though I have done it), and idle to me means low rpm.

Jeff

free load actually. There is nothing wrong with testing motors without a load.

[littlegiant]

Originally Posted by hemiblas

Woops, you know what, it an 8L purple feigao. Sorry about that. I can only read the 77A max sticker and the .0076 ohm on it which I think corresponds to an 8L motor. So a 7L would be higher than what I gave you. Ya I just hooked up my wattmeter and let it run full blast for a couple of seconds. I tried a couple times to be sure, but you dont want to run these things unloaded for too long.

33A peak on 3S sounds fine. In fact that might be a bit low. I'm assuming its a light buggy to get that number. But ya looks like it is ok.

Hey thanks alot. 33A peak on 3S was tested on a low traction surface. Asphalt or grass will definitely result in a higher peak current.

[zeropointbug]

Originally Posted by J57ltr

Well I didn't know, I didn't think you were supposed to run them at full throttle without a load (though I have done it), and idle to me means low rpm.

Jeff

j/k about that... well about it being complex and all. It's just the no load full rpm is what idle current would be. For instance, my 1512/3D on 6s lipo will consume only 1.5amps at 40,000rpm with no load.

[hemiblas]

Something I have learned about the feigao motors is they last forever as long as you cut the run short when they get to about 175 ish. Once they go over that and overheat, they become useless. So watch temps.

[J57ltr]

Originally Posted by zeropointbug

j/k about that... well about it being complex and all. It's just the no load full rpm is what idle current would be. For instance, my 1512/3D on 6s lipo will consume only 1.5amps at 40,000rpm with no load.

I forget you guys run all those low Kv motors, my lowest is 3.3Kv and they go up from there so my last 3 are well over 60K at 3S

Jeff