Power, Torque. 9L vs 10L

Originally Posted by boss 302

if you want more torque than go with an xl motor.

RIGHT!

[Serum]

and when they turn their energy almost directly into heat, you know that the satisfaction point of the magnet is reached.


if you calculate it back, the same motors from a serie with another winding will have the same power.

Here, take a look at these measurements;

http://www.lehner-motoren.com/diagra....18v_liste.txt

http://www.lehner-motoren.com/diagra....18v_liste.txt

if you look at the poweroutput of both motors and take a look at the 800watt line, you'll see that the 1940/10 has got 28.7 N/cm of torque and the 1940/12 has got 34.05 N/cm of torque. and if you take another look at the RPM's, you'll see that the the 1940/10 delivers 28.7@26797rpm and the 1940/12 34.05@22674.

these values mean, that the motor can lift;

28.7N@101km/h
34.5N@85km/h




so the motors will deliver about the same power, but the 10L will have got more torque (untill it reaches the satisfactionpoint of the power of the magnet) then, both motors will have the same power. but with this higher torque, comes a lower RPM, and RPM X Torque = POWER and you don't run your car on torque, but on power.

[coolhandcountry]

Well If the formula is right power = torque x rpm The 10l has it beat. The 10l has lower kv so it takes more torque to equal the same power.

[studysession]

I put an 8L in my EMaxx today it is insane. I have a 10L in my 1/8 scale buggy and it is just as insane but the 8L is a bit fast because higher kv per cell.I am temped to try to find a 10L with a 1/8 shaft if I could and use it in my EMaxx for the better run time.

[Serum]

@leroy, that is exactly my point. same power.

and you don't run a car on torque or on RPM, it's a mixture of both.

[GriffinRU]

Torque Down < decrease < Number of turns > increase > Torque Up

Torque Down < decrease < Can (Core) Diameter > increase > Torque Up

Torque Down < decrease < Can Length > increase > Torque Up

Torque Down < decrease < Magnet Size > increase > Torque Up

Artur

[maxxdude1234]

Just for the record artur, I agree with everything you say here. BUT, the torque a motor needs to produce depends solely upon the load put upon it. The factors you hightlighted (number of turns, can diameter, can length, magnet size) affect the 'kt' of a particular motor. The 'kt' of a motor will affect how much current the motor will need to draw to produce enough torque to overcome that load.
Not critizising you; just trying to clear this up for everyone else

ps. to all those people who say 'if this formula is correct; power = torque x rpm' - there is no 'if' about it. This formula stems from moment calculations in physics, and believe me its correct!

[Serum]

It sure is maxxdude.. It sure is..
and that is the reason why i keep saying it's NOT ONLY about torque.

It's the mixture of torque AND rpm..

TORQUE determines the TIME the car needs to get to topspeed

and BHP (watts) determines the TOPSPEED of the car.

together with a whole lot other variables, but this is about torque and motors, so this is the thing that is relevant, without getting into useless details.


And in RC, you can take a 9L. and if you want more runtime, take a 10L...

If you want noticable more torque, get an XL.

[coolhandcountry]

Originally Posted by GriffinRU

Torque Down < decrease < Number of turns > increase > Torque Up

Torque Down < decrease < Can (Core) Diameter > increase > Torque Up

Torque Down < decrease < Can Length > increase > Torque Up

Torque Down < decrease < Magnet Size > increase > Torque Up

Artur

Well to this table right here is right the 10 L has more torque to.
I think the 9l or 10l has a good torque but it would depend alot on the runtime and batteries to which one i would run. the 9L on 16 cells would have good power but would suck cause of heat issues.

like i said earlier if you want more torque just go with an xl size motor

[GriffinRU]

http://www.rc-monster.com/forum/show...?t=2689&page=2

Artur