Size motors to use with MMP

[Pdelcast]

Originally Posted by J57ltr

Patrick mentioned that they would not warranty a MMM used on a motor less than 70mm long.
Jeff

I don't recall ever making that statement. You can always run a smaller motor on a big controller. The MMM can commutate a motor just as fast as our smaller controllers, so there is no real limit on RPM on the MMM.

[LiqrSicc]

Originally Posted by J57ltr

It would seem to me if you used a 2200 on 6S or a mini erevo motor on 6S it would kill the MMP for sure. Patrick mentioned in one thread that the 2200 could draw in excess of 2K amps and in another thread that they would not warranty a MMM used on a motor less than 70mm long. I cant find the thread for the 70mm statment, but it made since to me at the time. I looked most of the evening yesterday but Patrick posts a lot and I get side tracked easily.

Jeff

I have a mini-revo running 6s on my MMP with a Neu 1115. I think the MMP is more than capable. So far I havent seen temps over 140. I get my Eagletree this weekend so I can see what kind of amps I'm actually pulling.

[BrianG]

Originally Posted by J57ltr

It would seem to me if you used a 2200 on 6S or a mini erevo motor on 6S it would kill the MMP for sure. Patrick mentioned in one thread that the 2200 could draw in excess of 2K amps and in another thread that they would not warranty a MMM used on a motor less than 70mm long. I cant find the thread for the 70mm statment, but it made since to me at the time. I looked most of the evening yesterday but Patrick posts a lot and I get side tracked easily.

Jeff

I don't know why you would say that. Motor current is a function of load (gearing, weight, etc) for the most part. In something as small as the mini ERevo, there is practically no load, so you'd be lucky to draw 10A max, and most of that would be the power required just to accelerate the rotor by itself. Frankly, I'd be more worried about the drivetrain.

Patrick mentioned in one thread that the 2200 could draw in excess of 2K amps and in another thread that they would not warranty a MMM used on a motor less than 70mm long

. I actually think Joe might have said something about this . IIRC it was pertaining to a smaller motor, in a bigger vehicle, and that once a small motor starts to go, it can fry the esc due to over amp draw. The smaller motor being more likely to have a problem with a heavy vehicle.

[suicideneil]

Thats what I seem to recall too- was quite a while ago for sure. Using an undersized motor and trying to gear it like you would a larger motor will cause issues with any esc- once the motor starts to demag its sucks current like crazy- esc and wires then start to heat up alot; take my word on that one...

[Riko]

lol so, can somebody sum up for noobs? :D

MMP (1/10 esc) + small motor (for 1/10) = good combo
MMp esc + larger motor (2200kv) = bad...because

MMM (1/8 esc) + small motor (for 1/10) = bad...cause
MMM + larger motor (2200kv) = good combo

[Unsullied_Spy]

Originally Posted by Riko

lol so, can somebody sum up for noobs? :D

MMP (1/10 esc) + small motor (for 1/10) = good combo
MMp esc + larger motor (2200kv) = bad...because

MMM (1/8 esc) + small motor (for 1/10) = bad...cause
MMM + larger motor (2200kv) = good combo

MMP + Larger motor = Bad when used in the wrong setup, in 1/8th setups I'd use it only on 6s with lower KV motors when your peak power output is less than 2,000 watts (keep the amps down).

MMM + Small motor = OK. Small motor + big truck = bad. You won't hurt a motor or ESC by using an overkill ESC.

[J57ltr]

Originally Posted by Pdelcast

I don't recall ever making that statement. You can always run a smaller motor on a big controller. The MMM can commutate a motor just as fast as our smaller controllers, so there is no real limit on RPM on the MMM.

Ok it wasn't you it was Joe and it was 68mm not 70. I guess I remember seeing the Castle logo and since you were the last one to post I thought it was you.

http://www.rc-monster.com/forum/show...ght=warrantied

I would like to use the MMP unless you recommend against it. I would also like to keep in warranty at least until it is up. I need something smaller than the MMM combo to keep it under the buggy body, there isn't a lot of room under there. Since I don't plan on bashing around with this car (at least with the same setup) so would be recommended for this application?

Jeff

[J57ltr]

Originally Posted by BrianG

I don't know why you would say that. Motor current is a function of load (gearing, weight, etc) for the most part. In something as small as the mini ERevo, there is practically no load, so you'd be lucky to draw 10A max, and most of that would be the power required just to accelerate the rotor by itself. Frankly, I'd be more worried about the drivetrain.

Dunno I guess I was tired.

I'm probably gonna get booed off stage for this statement. But it seems to me like Novak has the best mid-size motor right now, the HV. Why not take advantage of all that sensor work they put into it. :D If you used the 7.5 (3000kv) then the bigger rotor, which is supposed to drop the kv, and figure that it is an unloaded rating, it should be fine on 6s.
I'm thinking of running this combo, in 4.5 flavor, on 4s, in the new Slash 4x4 .

[BrianG]

I agree asheck. With the demise of Medusa, the Novak HV series is about the best mid-size motor out that I can think of.

[scarletboa]

*cough* neu 1509 and 1512 series *cough*

[BrianG]

OK, I guess price should have been mentioned too.

[Unsullied_Spy]

What does an HV motor with the new rotor cost?

Especially when you can get a reman Novak for 70 bucks. Rotor is an extra 37. But imo it is not an absolute have to have.