Motor Maximum Watt Ratings

[ReddyWatts]

This is what I found for motor max watt ratings on the net. Please help me fill in the blanks, adds or any changes.

Thanks!

continuous rating/ 30 second rating

Neu -
1506 - 700 watts/ 1500 watts
1509 - 1000 watts/ 2000 watts
1512 - 1200 watts/ 2500 watts
1515 - 1500 watts/ 2700 watts
1521 - 1700 watts/ 3000 watts
1527 - 2100 watts/ 3300 watts
2215 - 3000 watts/ 5000 watts
2230 - 6000 watts/ 10000 watts

KB45 - 1500 watts/ 2700 watts

Feigao
XL - 800 watts/ 1600 watts
L - 600 watts/ 1300 watts
S - 450 watts/ 1000 watts
380L - 450 watts/ 1000 watts

SV - BlackJack 800 watts/ 1600 watts

Ammo 2300 - 700 watts/ 1400 watts

700sc - 650 watts

Always calculate your setup Watts and know your motors amp - maximum effeciency rating

Volts (X) Amps = Watts

Steven, I cant find any maximum wattage ratings for your motors. Think about adding some to your listings or direct me to them, if I just missed em. thanks

[Ub Hauled]

1527 - 2100 cont, 3300 watts (30sec)

2215 - 3000cont, 5000watts (30sec)

2230 - 6000cont, 10000watts (30sec)

Source: http://www.flydma.com/index.php?cPath=1

[ReddyWatts]

Thanks, I added them.

[Doozie870]

I will also share the Doozafly inrunner motor watts. Decided to be a player in the sticker on the chinese motor game.

[AntronX]

Feigao 540 Motors Maximum Amps:

7S = 93A
8S = 81A
9S = 72A
10S =65A

7L = 88A
8L = 77A
9L = 68A
10L = 61A

7XL = 95A
8XL = 83A
9XL = 74A
10XL = 66A

Source: http://img.diytrade.com/cdimg/85838/...1082223033.jpg

Other Feigao motors: http://www.feigao.com/sdp/85838/4/cp-102738.html

This thread needs to be made sticky.

[ED66677]

I was told directly by Feigao (I contacted them when I started with FE boats before I found OSE), that the 540 range was design for 36 or 40 volts max, that would give a max of almost 4000watts for the 7XL! I'm not sure any of these motor with a KV above 1200 can really handle 40volts, a 6XL would spin more than 110000rpm while they are given for 50000rpm max???
the most powerfull (6XL) at 50000rpm, at 110Amp, would handle a max of 18Volts so the real max power would be 1980Watts!

[Ub Hauled]

I guess their (Feigao's) philosophy is "Aim High... sell what you can".

I have a hard time believing that any 540 can they have can deliver more then 900-1100watts... but I like to see the glass "half full"... there is a lot of room for improvement.

[ED66677]

my 8Xl has delivered easily a bit more than 1000watts under 3S, dead cold!

[ReddyWatts]

I was just going by my experience with a Feigao 540. Running a 10XL on 18 cells and 3300mah cycle, it would get the motor to 145F. That was 1600 watts max and thought the factory had said 800 watts. I think I recall other users saying they ran them around 1800 watts max in races.

This discrepency is interesting. It is clear why users are overloading these motors. We need a definate answer on the Feigao series motors.

[AntronX]

I was told directly by Feigao (I contacted them when I started with FE boats before I found OSE), that the 540 range was design for 36 or 40 volts max, that would give a max of almost 4000watts for the 7XL!

No, you can't apply that voltage to 7XL. That 40V estimate was probably meant for 16 to 34 turn range, not 7 turn. You can try running 4KW into 7XL, but it will not last. The magnet core will quickly overheat and demagnetize. In your calculation, you took 7XL max amp value of 95A and multiplied by 40V giving 3800W. Guess what, electricity is a funny thing, it does not work like that. At 40V, with x437 prop you will not get 95A, but somewhere between 200 - 300A (crude estimate).

IMO, the proper way to estimate power for these motors, is to start with half of max amp value and measure magnet rotor temperature. It may not be possible to open up the motor after every test, pull the rotor out and measure it's temp. Maybe the driveshaft temp can be close enough. Then compare the result to the temperature at which magnets will start to demagnetize. Then get the temps to the threshold, and record your amps and volts during load, multiply and you get your watts. Note that with better cooling it may be possible to get more power out of the motor without demagging it, so this max power estimate will vary greatly between different setups of different people. Someone who is cooling their 540XL with liquid Nitrogen can dump more power into it, than someone using tiny water cooling jacket.

[ED66677]

No, you can't apply that voltage to 7XL. That 40V estimate was probably meant for 16 to 34 turn range, not 7 turn. You can try running 4KW into 7XL, but it will not last. The magnet core will quickly overheat and demagnetize. In your calculation, you took 7XL max amp value of 95A and multiplied by 40V giving 3800W. Guess what, electricity is a funny thing, it does not work like that. At 40V, with x437 prop you will not get 95A, but somewhere between 200 - 300A (crude estimate).

Isn't it what I said?

the most powerfull (6XL) at 50000rpm, at 110Amp, would handle a max of 18Volts so the real max power would be 1980Watts!

[Steven Vaccaro]

Steven, I cant find any maximum wattage ratings for your motors. Think about adding some to your listings or direct me to them, if I missed em. thanks

Feigao doesn't list any good performance charts.

From my testing I have found that the 380L is about the same output as a 540S.

[Steven Vaccaro]

One other thing to consider.

Will a 1515 thats 1500 watts run at

10 volts x 150 amps
or
20 volts x 75amps

at the same efficiencies?

[AntronX]

the most powerfull (6XL) at 50000rpm, at 110Amp, would handle a max of 18Volts so the real max power would be 1980Watts!

6XL is not the most powerful. 32 turn is just as powerful as 16 turn, as 8turn. Max amps do not represent how powerful the motor is. 6 turn is wound for low volts and high amps. 16 turn is wound for higher volts and lower amps. Either way, power should stay the same. Power (W) = Volts * Amps.

Hey, if someone feels like donating few Feigao motors for me to test, feel free to do so. I will post my progress here on the forums. I can return them back, if they survive.

[AntronX]

One other thing to consider. Will a 1515 thats 1500 watts run at 10 volts x 150 amps or 20 volts x 75amps at the same efficiencies?

If more amps means more heat, and more heat is less efficiency, then the answer is obvious. But is it same one 1515 in both situations, or 2 differently wound motors?