ebike4healthandfitness said:
Here is what I get with Leaf bike 1500 Kv set at 9.6:
https://ebikes.ca/tools/simulator.html?bopen=true&motor=9C212_6T&batt=cust_72_0.00001_40&cont=cust_80_250_0.00001_V&hp=0&cont_b=cust_80_250_0.00001_V&motor_b=Leaf%205T&batt_b=cust_72_0.00001_40&hp_b=0&kv_b=9.6
(Peak power for RH212 occurs at 378.5 rpm with 70.7% efficiency for 4032 watts. Peak power for Leaf bike 1500 (Kv 9.6) occurs at 426 rpm with 71.7% efficiency for 4066 watts)
Here is what I get with Leaf bike 1500 Kv set at 9.0:
https://ebikes.ca/tools/simulator.html?bopen=true&motor=9C212_6T&batt=cust_72_0.00001_40&cont=cust_80_250_0.00001_V&hp=0&cont_b=cust_80_250_0.00001_V&motor_b=Leaf%205T&batt_b=cust_72_0.00001_40&hp_b=0&kv_b=9.0
In both of your simulations, you have the battery and phase resistance down to nothing, and the power jacked up so we can see the true but you haven't adjusted for RPM. Watch what happens when we do this:
Upright bike ( your scenario, just adjusted for RPM differences )
https://ebikes.ca/tools/simulator.h...=mph&blue=Lbs&frame_b=mountain&frame=mountain
2021-12-20 05_51_41-Motor Simulator - Tools.png
Now if you take that simulation and put the stator in more of a low-load, high RPM situation, IE in a semi-recumbent with 20" wheels ( better aerodynamics, very different load point on the motor ) we start seeing the achilles heel of the RH212 - the lower efficiency during cruise conditions is noticeable:
https://ebikes.ca/tools/simulator.h...b=20i&wheel=20i&mass_b=120&mass=120&kv_b=9.71
20 incher.png
This is the effect of the extra poles and higher iron losses here.
You sometimes see the opposite with a 29" wheel. The RH212 pulls ahead in efficiency in mid-high power situations. In low power situations, the leaf can often the efficiency race by ~0.1%.
https://ebikes.ca/tools/simulator.h...20&mass=120&grade=&grade_b=&grade=0&grade_b=0
The RH212 performs admirably for it's weight in 26/29 wheels... but the smaller the load, the smaller the wheel ( when you adjust for the RPM difference ), the more the leaf shines.
You might think this is splitting hairs, but when you're pushing serious power for a long time, efficiency matters a lot. A 2% loss of 2000W creates 40W of heat. A hub motor of these sizes can shed around 200W of heat continuously without any cooling mods - we have a very small 'heat budget'... so even 1% matters.
Here's the thing that really disappoints me about the RH212.. it is a bit smaller motor, and therefore should have less iron losses than the leaf.. but instead, it has a bit higher iron losses..