larsb
1 MW
I’ve seen 7500 rpm max stated by qs for the 138 motor. Might be less depending on the gear setup
larsb said:I’ve seen 7500 rpm max stated by qs for the 138 motor. Might be less depending on the gear setup
niels_ said:does anyone use a ND72490 with this motor?
i can't find anything about this controller anywhere.
https://nl.aliexpress.com/i/1005001971351434.html
EVOXY6768 said:Has anyone got this set up and running in there conversions yet ? Haven't seen many video's or complete builds beside the one posted here on endless sphere and what controllers is everyone using, QS suggest Votel EM 200
Considering this in my next build in a 125 motor cross bike.
Cheers
jhoexp said:Has anyone got this set up and running in there conversions yet ? Haven't seen many video's or complete builds beside the one posted here on endless sphere and what controllers is everyone using, QS suggest Votel EM 200
Considering this in my next build in a 125 motor cross bike.
Cheers
jhoexp said:john61ct said:OK how about "better" for long steep hills & heavy loads at low speeds. Very slow top speeds.
Yes, exactly. It sure depends mostly on what use you want to make of it.
More mass means slower to overheat in that context?
I think you can say so, probably not much of a problem in most use cases.
Or are the magnets a small component of overall mass? When people talk about iron, and "moar copper", how do magnets fit in?
In this kind of IPM motors, magnet are embedded in the rotor laminations. Copper wire is in stator windings. How they influence performance is so complex that you can't really say much just from the lenght of the motor. I think you can probably assume that the longer motor will have higher torque and turn slower.
larsb said:Shouldn’t answer when you don’t know..
Longer magnet motor will also have larger stator and airgap area. You will get roughly proportional larger power out of the motor.
2x the stator and magnets, 2x the motor.
Motor will not be slower just because it’s got longer magnets, the peak rpm depends on winding, voltage, stator and magnet materials and structural design. The winding is not the same for the 90H motor as for the 70H.
jhoexp said:As I said, there is so much more that influence motor performance... but still with qs138 90H and 70H, with everything else staying the same, the first have more torque and turns a little slower than the smaller one.
So you just stated the obvious and nothing more than what already said, but being a dick. Well done, dumbass. :thumb:
larsb said:I guess it hurts to be wrong :wink:
The original question was for 70H vs 90H motor. Most things are indeed the same between these so why muddy the waters with “complex things”?
When i checked the QS data for the kV for 70H and 90H they have close to the same kV. Why do you say it’s slower? Have you measured them?
larsb said:Here we go from 90H vs 70H and then the magnet question. Since we’re discussing a really similar motor with increased length it’s not complex. there’s no point to compare two motors with different diameters or such difference and ask what is the best magnet height.
So what’s the kV for 70H and 90H in comparison? This data will help a lot of folks with their builds.
larsb said:Seem to understand? You did not understand: i said there was a change in the winding to keep the kV the same or it would have been roughly 60*70/90, so 47 for the 90H motor.
I just asked to prove you don’t know what you’re talking about. Give a man enough rope..
larsb said:Next thing i’ll ask is how relative torque vs inertia changes when a motor is made longer..
Does it change..really?