Look at the comparison between the BPM and the much smaller G370. Everything is nearly identical throughout the rpm range -speed, power and torque

https://ebikes.ca/tools/simulator.html?grade=010&motor=MBPM&motor_b=MG310_STD_O&grade_b=10&bopen=true

The G370 as a small motor performs well(I think) because they run the internal motor very fast and reduce the speed by something like 11:1 as compared to 5:1 with the BPM and xf15. But I wonder how does it compare to the BPM on long runs with 20 minutes continuous hill climbs in terms of overheating and durability? The 'Final Temp' on the simulator puts me off.

One of the attractions of mxus motors is that are very cheap and easily available at present and the xf15 upgrade seems (and has been) a good option.(so far so good)

Edited September 14, 20241 yr by Sturmey

Re The graph above, you have set the controllers with a maximum phase current limit of 30Amps and this is putting a limit on your BPM torque and is causing the torque blue line to abruptly level off horizontally as RPM drops. If you change you controller phase current limit from 30A to 70A as I have below to remove the phase limit, you will correct this as I have below.

This then explains the problem with the BPM low torque limit with your model. A higher rpm motor usually has more strands but less turns (all other things been equal) and needs more phase current which you put a 30A limit on..... Phase current is not the same as battery current and increases above battery current as the rpm drops below the peak power point on the curve.

PS. The reason I originally used the BPM as a comparison is because I thought it might come close to the xf15 which I upgraded to which is not modeled. Incidentally, what motor do you have at present?

 

https://ebikes.ca/tools/simulator.html?motor=MBPM&cont=cust_15_70_0.03_V&grade=10&cont_b=cust_15_70_0.03_V&motor_b=MXUS_XF07&grade_b=10&bopen=true

 

Ah, thanks for explaining, I had for some reason thought the max phase current set to 2*max battery current was appropriate

 

I have an xfO8c (in a 700c wheel), a Bafang g020 otherwise known as h405 ? (In a 26" wheel) and an 1.6 kg akm74 in a 20 inch wheel (which seems to have nearly identical properties to the 1.6kg Bafang g370 in a 27.5" wheel

https://ebikes.ca/tools/simulator.html?bopen=true&cont=cust_15_70_0.03_V&motor=MG75&wheel=20i&cont_b=cust_15_70_0.03_V&motor_b=MG370_10T&wheel_b=27.5i&grade=10&grade_b=10

)

 

The simulator seems to show a heavier duty motor with the same no load max speed, fed the same current by a controller, will have greater efficiency and a faster speed up a steep incline than a smaller motor (which is the impression that I had before)