larsb
1 MW
Just double wires to get more area then?
larsb said:Right, understood.
EG has had the habit of posting "you're attacking" etc in his posts, meanwhile sending nasty PMs so I thought about it before i posted but decided it could fill in the missing pieces, what's being said and done in the background.
TorgueRPM said:If they would just do something better for torque management, those motors would be so much more appealing. At the power levels these can take those axles just don't seem like enough. Something like an Enertrac torque arm would be awesome.
ridethelightning said:awesome wheel build! Where did you get the wheels please?
i have done something similar with cast 5 spoke 12"wheels, but i had to make a stainless ring adapter to get it to match up with the existing holes in the motor flange.
i did see the little cast 12" wheels with holes in them, but i couldnt find them in the right size at the time.
toolman2 said:fubgumfaw said:My motor...It's seeing 309 phase amp peaks at 82v that's 50kw now.
That is not correct and this appeared to have been successfully clarified by a number of members over the last page or two.
-When phase amps are at their peak, the motor rpm and voltage are going to be at a minimum. At this point your display for battery power consumption is going to reflect this fact and likely be reading closer to 5kw.
fubgumfaw said:I reported the peak phase amps the controller reported.
I took pack voltage X the reported peak phase amps to get that 50kw...nothing more than that.
What you are saying is "incorrect" is what the controller reported. I simply posted that information here.
John in CR said:I have dual 12F Nucs on 4 different bikes and the only issue I've ever had is that occasionally only one controller response when I jump on the throttle too aggressively from a dead stop, but returning the throttle to zero and twisting again makes it go every time. My pair of 24F's are waiting for the right project.
Regarding tire size, it sounds like you have MidMonsters, not HubMonsters. HubMonsters are slightly larger and come only with a 13" rim, though they may have made some with smaller for other companies. I'd love to get one with 12's as the smallest OD I've found in a 13 is 19.25", which is what I generally run. I have some with larger, including an EEB with a large 16" motor tire. That bike lacks real launch thrust, but the short wheelbase and high CG prevent what my lower longer scooters can do.
What Kv is the Nuc reporting on the motor(s) you have? What's the diameter of the bolt on cover?
Also note that the factory made a lot of versions of the same design using the same cast shells...different stator widths and different windings, so you can't know exactly what you have without measuring Kv and Phase-to-phase winding resistance.
john61ct said:So to get motor power kW from Phase amps, you need to know the motor voltage
can't multiply times battery voltage
is that correct?
john61ct said:You can't control other people.
But you can (perhaps) exercise control over your reaction to their provocations.
It is exactly within that gap that true human Freedom lies.
Ianhill said:john61ct said:So to get motor power kW from Phase amps, you need to know the motor voltage
can't multiply times battery voltage
is that correct?
Kv × battery volts give a theoretical top speed on traditional controllers but the vector foc controllers can exchange amps for volts in a way to extend rpm range at expense of more amps and more total power.
From what i understand the motor must have a torque reserve to get effective field weakening and not overheat the motor so a 48v system field weakeneing to get a 72v hub closer to its potential rpm fine.
48v motor on a 72v system allready pushed to its limit and then field weakening on top is going to push motor into saturation point get very hot and seal its fate.
john61ct said:So to get motor power kW from Phase amps, you need to know the motor voltage
can't multiply times battery voltage
is that correct?
Addy said:john61ct said:So to get motor power kW from Phase amps, you need to know the motor voltage
can't multiply times battery voltage
is that correct?
That's right.
Calculating battery power works alright to get the approximate motor power, but it would be less accurate if field weakening is involved. This is because part of the battery energy is being used to weaken the motor magnets instead of directly moving the motor.