Testing a couple of 1/10 120A ESC (Pictures of the 200A is in here too)

[lutach]

Originally Posted by snellemin

I just tried a silly 9/44 32P gearing in my big pan car, running the 2.5T motor on 3s1p A123 in my garage. It moved forward everytime and smoothly at that. But take out the sensor cable and you get some serious cogging. I need VHT to put some load on this motor.

With the high Kv motors I have it also does cog unless I go with a 15-16:1 ratio. Now it doesn't cog at all when I used a 5.5T (Half the Kv of the 2.5T) in my KX-ONE. That is why I only run them in sensored mode with low gear ratio, which is very smooth. The reason it didn't cog with the Medusa is because of the lower Kv it has.

[snellemin]

Yes, that is something the mamba can't do. You have to ease into the throttle to get a higher kv motor going.

[lutach]

Originally Posted by snellemin

Yes, that is something the mamba can't do. You have to ease into the throttle to get a higher kv motor going.

When you do your review with the Mamba, try and run the same set up with it.

[johnrobholmes]

sensorless startups will always cog with a higher kv motor that has a tall rollout. It just takes too much tire rotation to get a lock on the EMF feedback.


Good job on the ESCs lutach, I like seeing guys get what they want.

[lutach]

Originally Posted by johnrobholmes

sensorless startups will always cog with a higher kv motor that has a tall rollout. It just takes too much tire rotation to get a lock on the EMF feedback.


Good job on the ESCs lutach, I like seeing guys get what they want.

You're 100% right John.

These are still being tested and there could be more improvements. The factory will be doing a 40A micro ESC as well (I hope lol) as 2 versions of 1/8 scale ESCs. It's still not easy trying to get them to do exactly what I want and I'm not letting anymore of my ideas out.

[snellemin]

Originally Posted by lutach

When you do your review with the Mamba, try and run the same set up with it.

I allready know the answer with that one. It' won't do it.

[lutach]

Originally Posted by snellemin

I allready know the answer with that one. It' won't do it.

Ok lol.

[snellemin]

Did a few test runs with 4S1P A123 in the Rustler geared 58-15 and 58-25, with the Medusa 4800kV motor. Peak Amps between the two gear ratios was off by only a few digits.

I used a Dimension Engineering park bec instead of the built in BEC. I peaked at 1125W, 181.36A@5.58V
Power Graph

[lutach]

Originally Posted by snellemin

Did a few test runs with 4S1P A123 in the Rustler geared 58-15 and 58-25, with the Medusa 4800kV motor. Peak Amps between the two gear ratios was off by only a few digits.

I used a Dimension Engineering park bec instead of the built in BEC. I peaked at 1125W, 181.36A@5.58V
Power Graph

Have you noticed any difference between the 2 frequencies?

[snellemin]

Was too cold last nite to run both 8 and 16khz to record a difference in efficiency. I will warm up my battery pack before I run the frequency difference test for max output.

[lutach]

Ok sounds good.

[snellemin]

I ran the 200A esc on 6s1p A123, medusa 4800 50mm, geared 58/12 and eagletree showed 1700W peak. The pack was cold when I used it.
weather low fifties.
batteries cold
16khz esc setting
timing normal
initial acceleration high

PEAK 1730W=185.72A&6.1V
tires imex 4.25"
motor got to 100F in less then 4 minutes.

[lutach]

Originally Posted by snellemin

I ran the 200A esc on 6s1p A123, medusa 4800 50mm, geared 58/12 and eagletree showed 1700W peak. The pack was cold when I used it.
weather low fifties.
batteries cold
16khz esc setting
timing normal
intial accelaration high

PEAK 1730W=185.72A&6.1V
tires imex 4.25"
motor got to 100F in less then 4 minutes.

You are crazy lol. We definitely need better batteries now. Goodness gracious.

[snellemin]

I should try those packs Mike sells and see how low I can pull those with this ESC.

[lutach]

Little video of the 1.5T working:

http://www.youtube.com/watch?v=KC_1VgrSp2c

It takes a little bit of power to get it moving, but the 200A ESC doesn't seem to mind it.