Maddness

Hi guys. Just been looking at some amazing brushless motors. Spotted a lehner 3080 (10Kw!!!). Just thought to myself, should i dare putting one in an E-Maxx?

If i did i'd be looking at about 60v lipos, speedwise id be seeing around what? 70? 80?

All just ideas...

Darren

[stampy]

i think a 3080 is totally out of the question in terms of size an power. 1 the sheer size of a 3080 is huge i doubt you could make a a mount that would work. 2 the shaft is 10mm you would have to make a pinion for it cause ive never seen a 10mm mod1 pinion. as for 60volts of lipo thats alot of batteries even with lipo this thing will weight a ton. i think if your after 70 mph a 2280 on prolly 29.6 volts (4 7.4 lipo packs) should get you there. sorry to rain on your idea :002:

[BrianG]

Wow, those 3080's are BIG! 120mm x 60mmD?!? Must be something for robot wars, or a R/C life-sized buggy.

What kind of controller would you use?? Either way, it'll take an obscene amount of voltage and/or current!

[HotnCold]

But boy what would it look like. " You run brushless..... Now This is brushless".. LOL

YOU CAN DO IT! (Rob schnider voice)

3080 10t
16s4p lipo
Kontronicks power jazz

perfect!

[HotnCold]

The Waterboy was friggin hilarious. Awesome movie...

[maxxdude1234]

Its quite possible that a couple of 3080 motors could be used in an electric city car. Two of these motors would give about 27hp, would be plenty to move a little inner city car and would keep all the green activists happy :).

[coolhandcountry]

I was thinking of getting a 3060 and mounting it to a chassis with direct drive the the rear diff. I think it would have enough power to pull it and would be awesom fast. Never tried yet though. :027:

Seems like a bad idea in some ways and a good idea in other ways.

I'll keep thinking about it.

Stampy - Yes, gears would have to be custom made. Motor mount idea would clam round the motor case at the rear and support it there, so it doesnt move.

I don't know the amp draw, but i'll look around.

[jagboy]

I was looking at using two 3080s to power an electric kart, but I couldn't find an ESC that could handle the voltage and amperage. I checked out the Power Jazz, but it can only handle 120 amps. If you used all 120 continuously and 63 volts, you could only produce 7560 watts. You need a 63 volt controller that can handle 160 amps continuous to produce 10kw. Schulze has two that can handle the amps (Future 32.170 and 40.160), but they fall short on voltage. I'm sure that there is an industrial company that has one, but I dont know of any controller capable of handling it. I'm sure there is one out there or else Lehner couldn't sell any of their 30 series motors. The car would have to be built around the motor. I dont think any current production car would be able to take 10kw even with upgrades.... maybe the Baja 5B. That would be incredible! Anyway... sorry to be the bearer of bad news, but if you find a controller please tell me. I'm always looking for stuff like that. If I find one, I'll tell you.


JB

[BrianG]

It might be easier to simply get a small low current/voltage ESC and then add as many output FETs as needed to handle the current. You'd basically just be using the input decoder circuitry (from the transmitter) and the "programming" from it. The voltage capacity is limited by the choice of FETs. Yeah, it would be clunky and rather large - not like the nice neat little ESC we are used to...

[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!

[captain harlock]

What are you guys thinking?!! You've been stripping gears and spurs with the 22 series and yet, you're thinking of mounting an almost 2kilo motor in your pooor truck?!! I tell the truth, it wont be any joy, at all. Use a 2280 if you want extreme power. A 3060 or 3080 are beyond rediculous.

Hmmm I'll look at controllers. There was a boat that had two 3080's in it, so there must be a controller out there to handle it.