Novak HV4400 and 7XL BL Sensored System...

[crazyjr]

Hey GriffinRU, I just recently aquired a Novak HV-Maxx brushless system and within minutes of running it for the first time the Magnet slipped on the shaft. As i fixed it with JB Weld( no warranty) I tried to find the sensors and couldn't. Could you explain how the sensors work with nothing to key into on either the magnet or the shaft? When i think sensors i think revo Optidrive, but i'm sure it could be a solid state setup as well. So could you please enlighten an old newb? thanks

[Serum]

Yeah Artur!! this would be awesome.

I would love to drive a 10XL on 18 cells sensored, it is possible to get the hvmaxx esc modified to run on an higher voltage, right?

[GriffinRU]

Originally Posted by crazyjr

Hey GriffinRU, I just recently aquired a Novak HV-Maxx brushless system and within minutes of running it for the first time the Magnet slipped on the shaft. As i fixed it with JB Weld( no warranty) I tried to find the sensors and couldn't. Could you explain how the sensors work with nothing to key into on either the magnet or the shaft? When i think sensors i think revo Optidrive, but i'm sure it could be a solid state setup as well. So could you please enlighten an old newb? thanks

BL motors use magnetic feedback. 3 sensors, based on Hall effect, placed 120degress apart generate signal for ESC everytime magnets pole passes by. Attached picture shows Novaks sensors, located inside can.

Artur

[GriffinRU]

Originally Posted by Serum

Yeah Artur!! this would be awesome.

I would love to drive a 10XL on 18 cells sensored, it is possible to get the hvmaxx esc modified to run on an higher voltage, right?

16 cells, even without mods, should be fine, using correct wiring (6 cell on capacitor side, the rest on opposite). But more then 16, I need to investigate this possibility, now hopefully (still working on sensors) I have a motor to play with.

After solving initial problems, future upgrades/modifications would be addressed as usual. :)

Artur

[Serum]

16 is nice. what is up with the 6cells on the capacitor side? is it a BEC issue? or are these cells used for feeding the processorboard?

Keep us updated please, this is a very interesting project.

Are those sensored feigao's easy to get?

[crazyjr]

Ok thanks, i saw that but thought you needed a rotating assembly for the sensors, like the Revo Optidrive system. But if it runs on magnetic feedback, wouldn't it be similar to a sensorless except sensorless doesn't use a circut board to detect movement?

[GriffinRU]

Originally Posted by Serum

16 is nice. what is up with the 6cells on the capacitor side? is it a BEC issue? or are these cells used for feeding the processorboard?

Keep us updated please, this is a very interesting project.

Are those sensored feigao's easy to get?

Both, BEC and ESC power, one is less important but second is prone to overheat the PCB.

It is possible :) but is it easy or not I am not sure, sorry for not clear answer.

Artur

[GriffinRU]

Originally Posted by crazyjr

Ok thanks, i saw that but thought you needed a rotating assembly for the sensors, like the Revo Optidrive system. But if it runs on magnetic feedback, wouldn't it be similar to a sensorless except sensorless doesn't use a circut board to detect movement?

Sensoreless based on feedback from phases, which only exists when motor spins, while sensored feedback doesn't require rotation to point out rotors location.

Artur

[maxxdude1234]

Originally Posted by GriffinRU

Sensoreless based on feedback from phases, which only exists when motor spins, while sensored feedback doesn't require rotation to point out rotors location.

Artur

....And the slower the motor spins, the smaller the 'back emf', so the less easy it is for the controller to detect the rotors position - hence cogging at low speeds.

[coolhandcountry]

If I read correctly some where. Can't you bypass the first 6 cell group and run a ubec to power it. The run the 16 cells like in a series on the other wires. The main hot and ground wire.

[GriffinRU]

Originally Posted by coolhandcountry

If I read correctly some where. Can't you bypass the first 6 cell group and run a ubec to power it. The run the 16 cells like in a series on the other wires. The main hot and ground wire.

No.

There is no way to substitute built-in power for logic and brains with external power without modifications on PCB.

Artur

[GriffinRU]

Ok, it is working now. Almost plug and play :)
Requires some tweaking on sensor side, I will share info with Feigao, hopefully it can be resolved.

So far works as expected. Too bad its raining outside.

Artur

[coolhandcountry]

Well is other companies going to make a sensored esc. I would hope so. I would like to see a 8s lipo capable esc with sensored smooth running.

[Red350DropTop]

I have got a bunch of new stuff coming for my maxx. 977 charger, 9L and a HV-Maxx setup. I will try out the HV-Maxx and then I think I am going to try the 9L on it as well. Could be a month though, but I enjoyed this writeup Arthur.

[GriffinRU]

Next would be mods on ESC.

By the way do not use reverse with Novak HV-Maxx or use it carefully, because going from forward to reverse is safe but going from reverse to forward... you can snap everything in your truck with big motors :)

Artur

P.S.

I have got a bunch of new stuff coming for my maxx. 977 charger, 9L and a HV-Maxx setup. I will try out the HV-Maxx and then I think I am going to try the 9L on it as well. Could be a month though, but I enjoyed this writeup Arthu

Thank you

Well is other companies going to make a sensored esc. I would hope so. I would like to see a 8s lipo capable esc with sensored smooth running.
__________________
Run quietly and have plenty of power.

Brushless. It rules.

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I hope so...