Maddness

[jagboy]

Hmmm.... could you elaborate a little. I hate messing w/ electronics (especially such crucial and intricate ones), but this intrigues me.


JB

[BrianG]

Originally Posted by jagboy

Hmmm.... could you elaborate a little. I hate messing w/ electronics (especially such crucial and intricate ones), but this intrigues me.


JB

By any means, I am not saying this will be easy! This is rough breakdown of what I'd attempt:

- Use the "brains" from the small ESC. If I was really good, I'd redesign all the circuitry for the receiver input, programming, and CPU control - but I'm not that good, so I'd cheat. :)

- Create a V/A amp (voltage and current amplifier) that will amplify the signal voltage to the battery voltage and amplify the current to 200A or more.

- Since the needed battery voltage (>50v) is quite a bit higher than the small ESC could handle, I'd initially bring the high battery voltage into the V/A amp and then also regulate it down to 8v to send to the battery input of the small ESC.

- Feed the three motor wire outputs of the small ESC to a voltage amplifier so the voltage is as high as the high voltage from the batteries.

- Then, use as many MOSFETs in parallel as needed to achive the current you want (>200A). Due to the way MOSFETs work, they can be easily paralleled. The devices would not be surface mounted, but typical TO-220 cases properly mounted to a heatsink. As you can imagine, the resulting

- Add some protection circuitry to the battery input and motor output of the small ESC so that if a problem occurs with the seperate V/A amp board, the ESC will still be usable.

- Use 6 gauge wire for the power, and 8 gauge for the final motor outputs.

I just wish I had a BL ESC to spare so I could experiment, something like the Mamba is pretty cheap at $80, but too expensive to just experiment with. Since it's not going to drive a low impedance load (V/A amp will take care of that), it won't even need a heatsink.

There are a few disadvantages to this:
- The V/A board will end up being rather large.
- The batteries that can supply this kind of current and voltage would be something like 4 or 5 car small batteries in series, which would be heavy!
- It would have to be a fairly large truck 1:6 or 1:4 scale to fit all the components and use driveline parts that won't shred with the torque!