With same specs, is one motor more powerful than the other?

[Arbol]

Let us assume we build:

1. A q100c at 12s with KU65 @ 15A
2. A Bafang CST / Xofo type of motor, also at 12s with also KU65 @ 15A (the same type of batteries too)

Max power in both cases is 44*15 = 660W.

Is one of the two configurations more powerful "in the real world" than the other?

At least with combustion engines, it does not need to be the case. A bigger motor (a v8 for example) will probably feel more powerful than a small engine, even if they have the same max power, due to torque at intermediate rpm.

Does it happen the same here?

 

[Deleted member 4366]

Yes. The 500w motor will draw nearer 15 amps for a greater speed range. I'm not sure why. I need to think about it a bit. Woosh say that their Big Bear motor has 15 amps max. It definitely climbs a lot better than a Q100.

Cross Xofo off the list. They only supply the trade. You'd need to buy a minimum quantity of something like 10 kits.

 

[trex]

9continent has a new motor, direct drive, 3.2kgs, with a selection of windings.
It looks definitely yummy!!
http://www.9continent.com/nkt/products_show.asp?id=100
d8veh, is it worth trying out?

 

[Deleted member 4366]

Everything is worth trying out because you always learn something. Whether it will perform like you want is a different matter. I don't use DD motors, so I can't really comment on them other than to state the obvious that you can get regen from them for what it's worth, and you get a bit of drag from them unless they do something clever.

 

[trex]

this motor is the nearest to the BionX. 5 year guarantee, noiseless, no broken gears - no matter how many Watts you run through the motor and costs less than a third of the price of my BBS01.
may need a temperature gauge though.

 

[trex]

apparently, it already has built-in temperature gauge, the temperature is displayed on the LCD in their kit.

 

[Geebee]

apparently, it already has built-in temperature gauge, the temperature is displayed on the LCD in their kit.

Do you have a link to the kit?

 

[trex]

this is the LCD with temperature display:
http://www.9continent.com/nkt/manage/eWebEditor/UploadFile/201411095230549.pdf

the motor works sensored/sensorless. With direct drive motors, the sweet spot where efficiency > 65% is quite narrow, you burn typically 25% more electricity. Is it acceptable for much greater longevity?
I am trying to devise a formula for choosing the best winding depending on cycling ability.