Darren2018 said:
I am wondering how to get the most power out of this setup:
QS205 50H (kV not decided)
Nucular 24F at 300bA/500pA
25" total wheel size
10-50mph
I know the basic theory is to condense the motors available power into a useful rpm range but as we all know this is not as easy as it sounds when the motor is mounted within the wheel itself as the most significant tuning variables are now void. To pick the motor that maximises the bA and pA limits is not too difficult but I would like to choose a motor that has a wide and useful power band. Would a 3.5T plus field weakening be best? Spinningmagents mentioned this combination and it makes sense. Is anyone running 500pA on a QS205 3.5T with field weakening?
5T vs 3.5T. Notice how much extra power is available from 15mph onwards
Screen Shot 2020-11-15 at 12.58.45 pm.png
Even when the battery is at 50% the 3.5T still has loads more useful power
Screen Shot 2020-11-15 at 13.02.26 pm.png
I think the 4T with field weakening might be the best option if the Nucular controller is ever able to be run on 24S as you will not be capped on pA like you are on the 3.5T and the extra speed that the 3.5T is capable of requires a lot of power to sustain it anyway. I don't think the top speed is an issue for either motor especially once field weakening is applied so at this point getting more lower end torque would probably be better. I am aware that heat will become a problem but primarily my bike will be used like a regular 350W ebike so I am not too worried plus Hubsinks and Statoraid will enable the motor to cool much faster.
4T 24S vs 3.5T 22S
Screen Shot 2020-11-15 at 13.42.20 pm.png
Who else is running any of these combinations? Anyone know of any high powered mid drive frames that keep the pedals and regular bike seat?
Hello all,
I am on the same boat here…
I’ve got the Nuc 24F controller on order, but I am still deciding on the motor winding and wheel size.
• Battery (21s12p VTC6 battery pack rated for 88.2V max), maximum voltage of the 24F controller is 90V
• Wheel would be 20” O.D., should be a good balance between low end torque and speed
• QS205 50H V3 (3T? 4?, I’m not sure)
Using the Grin Motor Simulator, it shows that the 3T motor has much higher torque and therefore higher acceleration after the 25 kph mark. Notice how the blue curve of the 3T extends over the blue curve of the 4T. So at 280 bA and 480 pA, the 3T should be the clear choice, no?
Please help me understand if I am missing anything. What’s the point in choosing a 4T or a 5T of it will produce less torque at these settings?