Dual MM + One Motor= ?

[Takedown]

I was thinking of doing this seeing that I already have two MM's on hand and would like to keep them instead of selling them and getting a MMM. I would like to run dual MM's in parallel into one high amp draw motor while running seperate lipos for each MM ESC. Is this even possible Im guessing it is if both lpo are exactly the same voltage and amp rating output. But what Im worried about is the ESC's fighting each other...

[brushlessboy16]

I threw this out ther a while back, as long as the escs are set the same they will be fine, because they are both being timed off the single emf pulse.

[What's_nitro?]

To be safe, you should parallel the LiPos prior to the MMs, and make sure all of the wires from MM --> Motor are the same length.

[lincpimp]

An interesting idea, but do you really need 200 amps at 4s?

Going to have quite a bit of battery weight. What are going to put this in? What motor?

[brushlessboy16]

Probably his Humungous outrunner, hes probably gonna run 8s with the beast

[lincpimp]

Doubling up mms will not double the voltage capability, just the amp capability. So it would be a 200amp 4s esc, maybe 5s.

[Takedown]

Yes that is what Im looking for linc. I dont want to buy a MMM at the momment but want to pair up two MM's in parrallel to see how well it does. And yes if all goes to plan I will either be running dual 4's or dual 3's. Seperate pack for each MM.

[brushlessboy16]

Well if u sell both mms, u will have enuff to get the Triple M

[skellyo]

Just take into account that the higher the current, the more inefficiency you'll have. Everywhere you have resistance in the circuit, you lose power in the form of P = I^2 * R.

[brushlessboy16]

in short u mean resistance(whic leads to) heat
He told me he was gonna run a micro ducted fan to cool his setup off... Wouldnt the doubled current potential far outweigh the extra wattage used as heat?

[Takedown]

I will be running a 53/30 stator outrunner and dont feel safe running 8s on a MM "Wonder Why" so thats were this idea came from. Heres a sketch of what I would like to complete...

[skellyo]

It will probably be ok in terms of the heat dissipation, but it's really a poor idea compared with going with a higher voltage and less current.

Look at it this way as an example...you have a 2000W load...

2000W on 4S = 135A, so 67.5A per MM designed for about 100A continuous (IIRC)

2000W on 6S = 90A on a single MMM designed for about 200A continuous (IIRC)

I know which one makes more sense to me. IMO, sell the MM's and buy a MMM.

[skellyo]

Originally Posted by Takedown

I will be running a 53/30 stator outrunner and dont feel safe running 8s on a MM "Wonder Why" so thats were this idea came from. Heres a sketch of what I would like to complete...

That's not 8S, it's either 4S2P or 3S2P.

[lincpimp]

Well, that has the mm paralleled, which will double the amp capability. Your motor will only see 4s though, not 8s.

[Takedown]

Oops I wired it wrong... Ill try and fix it quick.