Motor voltage

[dadnjesse]

I have a Neu 1515/1y with 10 gauge motor wires, that is rated around 4 cell.
I just purchased an 1515/2y that I am told will run 5 to 6 cells, why if it's rated for more voltage does it have only 14 gauge wires. It seems if it's going to be higher voltage, that the wires should be at least 10 gauge or thicker?





1515/2y/f

[bdebde]

At a higher voltage you will need less amps to get the same power output. Higher amps requires larger wire, less amps smaller wire.

[BrianG]

It is important to add that you will get less amps with more voltage IF the motor resistance is higher. And the 2Y does have higher resistance than the 1Y.

The whole amps question is moot really. So much depends on gearing, weight, drag, etc that is all but impossible to estimate. When selecting a motor, shoot for ~40k rpm for the better motors and ~35k for the Wanderers/Feigaos/etc. Then, just divide that max rpm by the motor kv to get the ideal voltage to run.

[lincpimp]

Not to hijack this thread but do you think the feigao 380xl motors could handle 4s or 5s. It is a good length and around 2900kv, so 4s would most likely be the maxx I would try.

[BrianG]

4s is a little on the high side for that type of motor at over 41k rpm. 3s would be a little better IMO at 32k rpm.

[lincpimp]

I was going to use 3s on it anyway. Do you see and advantages/disadvantages to using this motor over a simialr kv feigao 540 l can?

[GriffinRU]

I posted current rating for wires earlier, but again short wires can handle allot.
As for motor windings wire gauge defines current limit not the voltage. Voltage would be defined by core...

Use my program to find sweet spot for given motor and use common sense:
High RPM/Low Torque <- small/short MOTOR diameter/can length large/long -> Low RPM/High

[Sower]

Originally Posted by BrianG

It is important to add that you will get less amps with more voltage IF the motor resistance is higher. And the 2Y does have higher resistance than the 1Y.

The whole amps question is moot really. So much depends on gearing, weight, drag, etc that is all but impossible to estimate. When selecting a motor, shoot for ~40k rpm for the better motors and ~35k for the Wanderers/Feigaos/etc. Then, just divide that max rpm by the motor kv to get the ideal voltage to run.

Nice info to hear Brian. That makes me feel better . . . when I run your calcs for the 40k rpms, my Neu 1515 2700kv comes out to 14.8v and that's what I'm running.