Ive run 8kw through a Bafang 750 hub. And also blown 7 of them.
I think its true because I have WINDED motors myself. Its simple math a 3t motor may have 40 strands and a 6t motor would have 20 strands for the same copper fill. Thats half as much. It can only handle half the watts. You can simulate this with the grin sim. T
So I asked a bunch of experts. this very thing.
They all say ... "No you are wrong. A 3T CANNOT handle " 2x" the power" of a 6T."
IDK where you get that from bu I wont agree with it, nor the experts in the forum I asked for their opinion.
And yes we can use the Grin sim... To prove this.
its all about copper fill. equal copper fill between a 6T and a 3T means they handle the same amount of power ( in watts, Hp, or pferdestärke typically. Easy to convert between.
To quote an Endless Sphere expert ( undoubtedly watching this thread)... Barent... ( the Admin)
" if voltage is considered "variable" in your analysis, then ultimately any winding with an equivalent "copper fill" in the windings will produce approximately the same total power."
"if the battery voltage is the same in both instances (i.e. 48V) , then the 3T winding would handle more total power. I don't think I'd say Twice the power as a 6T winding, but certainly "more"."
and...
Sam: ( the moderator)
"No. Not half. The motor simulator on
ebikes.ca can confirm what i am about to say. It all comes down to copper density (ignoring everything else).
So for example if you weigh a 3T, 4T , 5T and 6T mxus 45mm with identical magnets and stators, the heavier will be slightly more power dense because m ore copper makes more flux. With only certain strand and turn counts possible each of the different variants have slightly different weights due to different amounts of copper fitting inside.
From memory for this specific example the 4T motor variant was about 5 percent more power dense due to having more copper.
But thats not 50 percent.
The key word in your question is “handle”. ""
and Marc:
"Half the amps, roughly yes so if same voltage then half the power. Talking about peak power only. Continuous is the opposite, the high turn count can handle a little bit more because it produces more torque with less amps."
Aaron
"Basically u get the same torque cause the 3t handles more amps and they'd burn the windings at approx the same torque levels, obviously different amp levels but it's about the same torque output."
So there are four people who have been doing this probably longer than you, and longer than my eight years, and know the correct answer.
I also was told how to show this on the sim if you want to get into that. You know.. from an expert. Unbiased education.
Hey, you tell us the QSMOTOR and the NBPower motors are the same, I show pics they are not.
You say its not a " 5kW NBP" and I show you the serial number and buyer quoting the purchase.
YOu say the wires are all the same... I show you wires half the size on the 5kW motors.
QSMOTOR SIA explicitly says on this forum that their motors are cloned and sold and others call motors "QSMOTOR" and overate them and stuff... and to look out for that..
QS specifically lists the 205 motor serial number info on this site and that NBP motor does not fit....
I post a friend comment on his 5kW NBP burnt... You tell me " that wasnt a 5kW NBP"... Yeah ok.
You mis spell " wound". Me? i say....
YOU tell us " these motors are all clones of the CROMOTOR" ... They aint. cause.. get this... I got a Cromotor here.. everything is different. The core, the shell, the bearings, the axle. Different. the strands per turn. Different.
I dont think we gonna get anywhere here. You just wont accept I might be right. Nor any of these other long time players.
I also got a few like this: from electrical engineers. Since you know. I work for power engineering commpanies and own one. They like to talk them ingineers. Talk all day you get them to. frocking smart people they are. lol. Love to talk. Some times. You can learn some shit asking real engineers shit. Lol. at least me, for me I can.
Ping said:
"there is no point in comparing motors with different windings because in the same situation each of them will have different efficiency and power consumption."
*Wound. I think " Wound" is the proper term. You " Wind " a motor and the past tense is "wound" not " winded".
The definition of ' WINDED" is not applicable here. I dont know how you 'winded" a motor. Is that like wearing it out?
1: cause (someone) to have difficulty breathing because of
exertion or a blow to the stomach.
"the fall nearly winded him"
out of puff
2.
detect the presence of (a person or animal) by
scent.
"the birds could not have seen us or winded us"
3.
literary
sound (a
bugle or call) by blowing.
"but scarce again his horn he wound"
" Power" is " Voltage dependent" and some loads are better served with certain RPM/V... such as Justins sailboat, who he rewound a Grin motor to a high RPM / V for his application.. an pulled INCREDIBLE power out of the motor... a few year back. As opposed to some other schools of thought that one might have about the tork on a sail boat prop. the higher rpm/V served him well for his application voltage...
Power as i know it is rads per sec squared around a diameter. .
enumerated in watts, brake horsepower, or PferdStarke.
I see it. It aint the same i dont know what the diff is.
