Novak HV4400 and 7XL BL Sensored System...
 

After playing for some time with dual BL novak setup, decided to improvise…

E-Maxx was used as a platform.

Mount HV4400 motor and Feigao 7XL motor onto E-Maxx tranny, match both motors timing and connect to HV4400 ESC.

Now you have perfect platform for running any serious BL motor in sensored configuration.

So far I like this combo, and found some interesting feature in HV4400 ESC. It is programmed to change timing at middle range RPM (will try to measure more precisely later), corresponding in different efficiency and might be reason why stock ESC/motor combo overheats.

Artur

P.S. Another reason was waiting on feigao sensored motors, want to see results sooner…

so you have run it sucessfully? what about runtimes? cant be to good huh?

Yes, 4 battery packs and 1 gear in tranny :)
About 7 minutes on 12 cell's
Run-time looks fine, my E-Maxx is heavy 12+lbs.
What is really good is that you can crawl, it is very smooth at low RPM.

Artur

7 minutes doesnt sound to pleasing but thats fixable with lipos :) do you have a picture? maybe a video? what kind of speeds? i would hope better than the hv and almost as fast as a 7xl on 12 cells correct?

I will put pictures later (camera on vacation :) ).
If I will have a chance I will capture video, but 7XL is 7XL you all new how it runs...

But let me tell you amount of torque at start is amazing, I need new gears for tranny.

Artur

P.S. Good thing is that hv4400 ESC can run it with no problem so far. And if you follow my EVX mod thread then most all principles apply for this ESC as well... (14 cells is not the limit as long as you keep 6 cells on capacitor connector, but do not exceed 18 cell's :) capacitors are not rated for that. I think, just kidding of course, Novak engineers checked my EVX upgrade, they change couple things... )

Are you running the motors on different controlers? Or, are you running them on the same controler?

You say novak changed some things. Does that mean that are better?

crazy, i think off of one.

Well, I am still collecting data on it...

so far HV ESC vs. EVX ESC:

- better water protection
- better FET's
- multi-layer pcb
- better BEC
- better 14 cells support, without mods can 16 (even 18, need to test)

fan support, external cap, external tabs...

7XL runs on HV4400 controller, HV4400 motor runs free. I am using only sensors from Novak's motor to drive big motor.

Artur

So in other words if novak was to change there motor design to a 7or8 xl 540 can. It would be a very competative system. If they did such a thing I would like to test it out. The hv maxx is only a 380 size now xl.

I am suprised that they haven't done this yet, including low and high voltage versions. It is so simple, their design allows to implement that very quick and easy. Not sure about motor part though...

But if Mike can get from Feigao brushless sensored motors, then we can have a very competitive priced killer setup. And if there is a demand I can think of conversion for HV controllers to run with more cell's (18/36/60++ :)).

Artur

What sort of current can the HV-maxx controller handle?

it is only rated at 14 cells max from the factory

I think griffinRU mean it will be able to handle more cells after modifications. Presumeably he'd be chaning the FETs to much more powerful ones, and installing different capacitors, and maybe a few other things. I've seen some of his work with modified EVX's - and its all looks very well done!
I was merely asking what the current handling capabilities of the stock HV-maxx ESC were, because they must be quite high if it can handle the 7XL. Novak havn't released many specs to do with the HV-maxx controller, so I wondered if anyone knew?

Thank You,

With proper cooling (stock fan works fine) up to 400A continuous per phase, 1000A peaks. Datasheet specs. But I will say 210A to be safe. Two FET's (IRF3703) per phase 210A each, 2.8mOh Rdon

To sum this all - 1.73*210=363.3 average :)

Enough to move motor wires if timing wrong.
2 to 5 times more starting torque then same motor with sensoreless ESC.

Artur

P.S. In stock form ESC is pretty good, HV-motor sucks...