The pictures used are from someone who watches both our channels. Before talking to him for the last few months i also knew nothing about the winding options. I thought 2T, 3T, 3.5T and 5T were it. Then he said 3.3T and im like “how da hail you gonna wind 3.3 turns?” Lol. Then he sent the chart and it made sense. I also helped my friend with electric ninja upgrade it from stock 273 3kw to 273 50H 3T 8kw, 21s80ah battery with 240a continuous 480a peak, 72890 controller. It could do 155 kph (96 mph), and this is a full size motorcycle. But now his wife bought him a Kawasaki 650 and the ebike was sold. Lol.
Here is the winding chart link so you can see it clearly: ibb.co/sgRYsb9 0:00 QS 273 bicycle motor winding and magnet option table. 0:09 the coils are in groups of 3, and the number 48 x 343 means 48 strands of magnetic wire, 3 turns, 4 turns, 3 turns (3.3t average) 0:16 this seems to say 80x222 meaning 80 strands of wire with 2 turns, 2 turns, 2 turns (2T average) 0:24 A basic generator only needs a magnet, copper wire and relative motion to generate electricity. 0:28 to increase voltage, you can increase magnet strength, turns of copper wire, or the relative speed the magnet passes the wires 0:32 Here we see how as the magnet size increases 28H, 40H, 45H, 48H, the rpm needed to make 72v decreases 0:43 Kv is the rpm needed to create 1 volt. A 12Kv motor will run unloaded 12 rpm for each volt the battery is charged to. 0:52 Smaller magnet makes less voltage per rpm, and therefore can run faster than a bigger magnet at the same voltage. 1:01 Field weakening is used to make the magnets appear to be smaller, allowing the motor to run faster before back EMF is too high 1:08 As you add more turns, of course the number of strands per turns must be less because of limited volume in each stator slot. 1:15 Choosing the correct motor is an absolute nightmare. 1:23 Setting field weakening on and limiting its depth mist be done carefully, especially when a 12kw controller is used on a 4kw motor. 1:31 rpm absolutely must be restrained when field weakening is on because if the motor runs unloaded it can go faster than its designed, ruining the motor and also overvoltaging the controller if suddenly field weakening is removed while the motor wants to make 120v due to high rpm.
I don’t know what that 7 is but in a QS 273 one od the winding options is 55x333, which means 55 strands of wire, wound 3 turns, 3 turns, 3 turns, about each set of 3 coils. Do you have a QS 273 motor? If so, what magnet size does it have 30H, 40H, 45H or 50H? What nominal voltage is your battery?
so with this chart. *running same set up as ebike guy* Should I ditch the 3.3t motor to a 2.5t or a 3t motor for the qs 273 v3 hub motor for higher top speed as I weigh little to nothing *my bike weighs more than me* currently my 3.3t motor will pull 385line amps and 268phase amps and caps around 75mph or so
@@player1unknown9 weight has nothing to do with top speed on a bicycle, its 99% aerodynamic drag, so its how big you are and how well you can tuck that will make you faster than someone else on the same bike. Thats why Angelo could reach 100 mph and Ebike Guy never even got close. Weight only affects acceleration, and if you are doing a top speed run with full acceleration then extra weight will make you consume the motor’s thermal mass and reach overtemp before reaching top speed. If the only thing you care about is top speed, then choosing a motor that reaches top speed just before using field weakening should do that, but its the aerodynamics that determines how fast you can really go on the bike. If the motor turns are so low it can just reach 100 mph before field weakening is needed, then that will have the highest top speed, but be inefficient at lower speeds. And while a 2T can carry more amps than a 3.3T before heating up, its still the stator width and magnet height that determines how much torque it can make, which is the thing trying to overcome that aerodynamic drag. A 273 (273 mm diameter stator) with 40H (40mm wide) magnet is generally not going to get you 100 mph. Even the 50H struggles to hit 100 mph. I would suggest whatever motor you get that you pay the extra few bucks for the temperature sensor. That would have saved Ebike guys motor if he had one and had it selected in settings. The other variable is Volts. As you go from 72v->84v->96v or even 108v, you can use lower higher turns and still overcome back emf at 100mph. With 72V you would do best with 2T to reach 100 mph but with 108v 3T will do better. To really see what your bike needs i would need to see a screen recording of your fardriver app during max acceleration up to top speed.
@@imho7250 I see so then at this point its my tune holding me back with 75mph being cap on 3.3t and aero. I could send you my recording of the fardriver how it behaves but idk where to send that to you unless I just post it on youtube
@@player1unknown9 , normally its easiest to go out to your test site, open the app, start screen recording, then do a slow scroll through all the settings top to bottom, then switch to graph and do a max acceleration to top speed. Then end screen recording and post it to your TH-cam channel, not as a short (so i have timestamps) had not for kids (because my app doesn’t let me comment on videos for kids), then let me know and I will watch it and comment.
From what he has explained he just has wrong settings. Perhaps when he used the 2T motor, which didn’t need field weakening to go an insane speed, he turned field weakening off, but then when the 2T had a problem and he switched back to the 3.3T, he didn’t understand it cant go that fast without field weakening. This short video will hopefully help him understand to turn on field weakening and set everything needed to protect the motor. He really needs a 273 50H 2T for his bike if he wants to move his big body through the air at 100 mph.
@@Ooohh-v3i , lol, I don’t know about all that but I’ve been discussing this same topic for a few months with someone else trying to make a 273 40H go 100 mph. This video just explains some fundamental things to understand when field weakening is needed.
Thank you my friend this is much needed 🙏
The pictures used are from someone who watches both our channels. Before talking to him for the last few months i also knew nothing about the winding options. I thought 2T, 3T, 3.5T and 5T were it. Then he said 3.3T and im like “how da hail you gonna wind 3.3 turns?” Lol. Then he sent the chart and it made sense.
I also helped my friend with electric ninja upgrade it from stock 273 3kw to 273 50H 3T 8kw, 21s80ah battery with 240a continuous 480a peak, 72890 controller. It could do 155 kph (96 mph), and this is a full size motorcycle. But now his wife bought him a Kawasaki 650 and the ebike was sold. Lol.
Here is the winding chart link so you can see it clearly: ibb.co/sgRYsb9
0:00 QS 273 bicycle motor winding and magnet option table.
0:09 the coils are in groups of 3, and the number 48 x 343 means 48 strands of magnetic wire, 3 turns, 4 turns, 3 turns (3.3t average)
0:16 this seems to say 80x222 meaning 80 strands of wire with 2 turns, 2 turns, 2 turns (2T average)
0:24 A basic generator only needs a magnet, copper wire and relative motion to generate electricity.
0:28 to increase voltage, you can increase magnet strength, turns of copper wire, or the relative speed the magnet passes the wires
0:32 Here we see how as the magnet size increases 28H, 40H, 45H, 48H, the rpm needed to make 72v decreases
0:43 Kv is the rpm needed to create 1 volt. A 12Kv motor will run unloaded 12 rpm for each volt the battery is charged to.
0:52 Smaller magnet makes less voltage per rpm, and therefore can run faster than a bigger magnet at the same voltage.
1:01 Field weakening is used to make the magnets appear to be smaller, allowing the motor to run faster before back EMF is too high
1:08 As you add more turns, of course the number of strands per turns must be less because of limited volume in each stator slot.
1:15 Choosing the correct motor is an absolute nightmare.
1:23 Setting field weakening on and limiting its depth mist be done carefully, especially when a 12kw controller is used on a 4kw motor.
1:31 rpm absolutely must be restrained when field weakening is on because if the motor runs unloaded it can go faster than its designed, ruining the motor and also overvoltaging the controller if suddenly field weakening is removed while the motor wants to make 120v due to high rpm.
how to calculate it if I have a 333x7 motor winding
I don’t know what that 7 is but in a QS 273 one od the winding options is 55x333, which means 55 strands of wire, wound 3 turns, 3 turns, 3 turns, about each set of 3 coils.
Do you have a QS 273 motor? If so, what magnet size does it have 30H, 40H, 45H or 50H?
What nominal voltage is your battery?
@@imho7250 my engine for qs 260 70H 12kw 96v
@@imho7250 th-cam.com/video/D6G_4DJHyqg/w-d-xo.html
so with this chart. *running same set up as ebike guy* Should I ditch the 3.3t motor to a 2.5t or a 3t motor for the qs 273 v3 hub motor for higher top speed as I weigh little to nothing *my bike weighs more than me* currently my 3.3t motor will pull 385line amps and 268phase amps and caps around 75mph or so
@@player1unknown9 weight has nothing to do with top speed on a bicycle, its 99% aerodynamic drag, so its how big you are and how well you can tuck that will make you faster than someone else on the same bike. Thats why Angelo could reach 100 mph and Ebike Guy never even got close.
Weight only affects acceleration, and if you are doing a top speed run with full acceleration then extra weight will make you consume the motor’s thermal mass and reach overtemp before reaching top speed.
If the only thing you care about is top speed, then choosing a motor that reaches top speed just before using field weakening should do that, but its the aerodynamics that determines how fast you can really go on the bike.
If the motor turns are so low it can just reach 100 mph before field weakening is needed, then that will have the highest top speed, but be inefficient at lower speeds.
And while a 2T can carry more amps than a 3.3T before heating up, its still the stator width and magnet height that determines how much torque it can make, which is the thing trying to overcome that aerodynamic drag. A 273 (273 mm diameter stator) with 40H (40mm wide) magnet is generally not going to get you 100 mph. Even the 50H struggles to hit 100 mph.
I would suggest whatever motor you get that you pay the extra few bucks for the temperature sensor. That would have saved Ebike guys motor if he had one and had it selected in settings.
The other variable is Volts. As you go from 72v->84v->96v or even 108v, you can use lower higher turns and still overcome back emf at 100mph. With 72V you would do best with 2T to reach 100 mph but with 108v 3T will do better.
To really see what your bike needs i would need to see a screen recording of your fardriver app during max acceleration up to top speed.
@@imho7250 I see so then at this point its my tune holding me back with 75mph being cap on 3.3t and aero. I could send you my recording of the fardriver how it behaves but idk where to send that to you unless I just post it on youtube
@@imho7250 th-cam.com/users/shortsNf-rMlz_rrw my send and yes I was at like 60% capacity or lower fixed all that as battery % was wrong
@@player1unknown9 , normally its easiest to go out to your test site, open the app, start screen recording, then do a slow scroll through all the settings top to bottom, then switch to graph and do a max acceleration to top speed. Then end screen recording and post it to your TH-cam channel, not as a short (so i have timestamps) had not for kids (because my app doesn’t let me comment on videos for kids), then let me know and I will watch it and comment.
@@imho7250 alright will do soon ill get back to ya when I do that.
I hope ebike guy didn't get a lemon or a vaulted hub motor
From what he has explained he just has wrong settings. Perhaps when he used the 2T motor, which didn’t need field weakening to go an insane speed, he turned field weakening off, but then when the 2T had a problem and he switched back to the 3.3T, he didn’t understand it cant go that fast without field weakening.
This short video will hopefully help him understand to turn on field weakening and set everything needed to protect the motor.
He really needs a 273 50H 2T for his bike if he wants to move his big body through the air at 100 mph.
@@imho7250 you are a genius and I know you are!!!
@@Ooohh-v3i , lol, I don’t know about all that but I’ve been discussing this same topic for a few months with someone else trying to make a 273 40H go 100 mph. This video just explains some fundamental things to understand when field weakening is needed.
@@imho7250 trust me you are if you was here in the state you would be a BILLIONAIRE if not already!!