Novak HV4400 and 7XL BL Sensored System...

[GriffinRU]

Originally Posted by BrianG

That's a pretty good idea by adding solder and wire to the traces - gives the trace a bit more "meat".

To increase the current capability of the ESC in general, what about simply adding a couple more FETs per phase? Those TO-220 style FET cases make it pretty easy compared to the surface-mount IC types. You'd probably have to add a PCB extension then use a different case - it would add a bit more weight but worth it IMO. From the pic, it looks like the source and drain leads are directly paralleled on each phase. From there, you'd have to see if the gates are directly paralleled, or if there is a resistor. The end result probably wouldn't be pretty, but you'd have roughly double the current capability and would heat up less due to the lower total "on" resistance. Just an idea...

Yes, thats the way, but not much you can do under Novak's "hood", but if you redesign power FET's PCB and re-use HV daughter (brains) board, then extra performance can be achieved. It can be packaged different as well.

We will see on demand :)

Artur

[squeeforever]

Hey Crazy, on that many cells or on 5s lipo, for racing, you might want to consider like a 9xl. My 10xl on 14 cells is already to much for a track. I can't wait to go to 6S lipo but im sure I'll have to turn down my epa alot.

[crazyjr]

I was refering to max cells, probably run 12 cells or 4s lipo for racing

[Red350DropTop]

Well, I finally converted my HV-Maxx setup to a sensored 9L.

I had a very hard time matching the timing of the motors just based upon hooking up the motors. It probably has to do with the can size, though Artur didn't mention it with the C50 motor. I probably spent 2-3 hours testing amp draw. I got it matched pretty well I think.

It was very dark when I ran some GP3700 6 cell packs though it. I was running my HV at 12 66 gearing. I am going for cheap here, so I drilled out a set of pinions for the 9L (it is a C can with a 5 shaft) . I ran 18 70 for the 9L. Wasn't extremely impressed by the top speed as compared to the HV, though it was dark. Controller was warm after a couple of minutes. Tried some GP3300 7 cell packs and it really picked up in speed. After a few runs with it, controller wasn't too warm, but motor had picked up some heat.

The brakes are too touchy now. At this moment, I am using the traxxas radio, and coming off full throttle to brakes anything over 1/8 trigger = flipping it on the lid. Artur, how were the brakes on your setup? I have a MX-3, need to get crystals for it though, but I will have to change the EPA if I want to drive this thing. I was being so conscious of not trying to flip it over, I clipped a sidewalk and broke all mounting screws on the plastic skid plate and bent the ears of my T-Maxx frame down. :019:

The HV-Maxx motor is pretty heavy, if I decide I like the setup, I will take the heat sink off to try and save some weight.

[GriffinRU]

Originally Posted by Red350DropTop

Well, I finally converted my HV-Maxx setup to a sensored 9L.

I had a very hard time matching the timing of the motors just based upon hooking up the motors. It probably has to do with the can size, though Artur didn't mention it with the C50 motor. I probably spent 2-3 hours testing amp draw. I got it matched pretty well I think.

It was very dark when I ran some GP3700 6 cell packs though it. I was running my HV at 12 66 gearing. I am going for cheap here, so I drilled out a set of pinions for the 9L (it is a C can with a 5 shaft) . I ran 18 70 for the 9L. Wasn't extremely impressed by the top speed as compared to the HV, though it was dark. Controller was warm after a couple of minutes. Tried some GP3300 7 cell packs and it really picked up in speed. After a few runs with it, controller wasn't too warm, but motor had picked up some heat.

The brakes are too touchy now. At this moment, I am using the traxxas radio, and coming off full throttle to brakes anything over 1/8 trigger = flipping it on the lid. Artur, how were the brakes on your setup? I have a MX-3, need to get crystals for it though, but I will have to change the EPA if I want to drive this thing. I was being so conscious of not trying to flip it over, I clipped a sidewalk and broke all mounting screws on the plastic skid plate and bent the ears of my T-Maxx frame down. :019:

The HV-Maxx motor is pretty heavy, if I decide I like the setup, I will take the heat sink off to try and save some weight.

Very good news, I am hoping rock-crawlers will jump on this setup.

Yes , brakes are very strong. I set mine to 45% only.
You can easily remove heatsink (by the way good heatsink) from HV-motor and use it somewhere else.
Sorry for C50 hassle, I thought that i published picture on its wiring. It is quite different from feigao.

Artur

[Red350DropTop]

No, the C50 motor did not throw me wiring wise. I thought that the smaller can motors would be harder to match timing to the HV motor by just hooking them together, and I wondered if the C50 gave you that problem.

[kufman]

I have also made this idea work for a lehner basic 4200 and a novak 10.5 running on the old SS5800 controller. I haven't road tested it yet, but it works well on the bench. I did cheat and use an o-scope to get the gearing lined up.

[kufman]

I just thought of something, we can use the slave motor to do the braking using a standard brushed ESC and some diodes!!

[GriffinRU]

Originally Posted by kufman

I just thought of something, we can use the slave motor to do the braking using a standard brushed ESC and some diodes!!

Why not using it to charge battery pack?

[zeropointbug]

I don't think charging the batteries (Lipo) is a good idea... I think the only batteries that can handle the currents would be A123's... but then again, it would be for a short period, so who knows, maybe it could work?

Arthur, are you still running this?

whats new with the feigo motors?

[kufman]

Originally Posted by GriffinRU

Why not using it to charge battery pack?

Probably could work, hadn't thought of it. Regenerative braking is usually such a small affect that it is proably more work than it is worth.