Hello All,

I’m here to bring forward some simulation data on the available hub motors. These simulations assume that the VESC is a Sinusoidal, Space Vector Modulation @ 6 Khz or 20Khz. I am going to present the information available for @Hummie and @jacobbloy’s hub motor designs. Because of the limitations of the software I am using, I cannot simulate their temperatures. That said, the temperatures I do simulate do not account for passive air cooling through vents or shaft/hangar heat sinks (@carl.1).

Target RMS Current is 30Amps for these simulations. I do account for the voltage difference between Jacobs (10s) and Hummie’s (12s). I ask that everyone STOP TALKING ABOUT KV. Focus on Temperature and Torque because those are the variables we need to be more careful about - not speed! Scaling can happen later. If you can respect that, then please add your commentary.

I’ll update this as I get around to it. If people want me to produce more accurate results, I do not have any version of Hummie’s motors so please tell me the specs.

## Jacob’s V2 Motors (24 Pole, Wye)

6Khz SVM Freq.

20Khz SVM Freq.Winding Specs.

## Hummie’s V2 Motors (12 Pole, *Wye???*, 80 kv)

I interpert this to mean that his 80 kv model is 24.25 Awg, 1 Strand, 33 Turns.

6Khz SVM Freq.

20Khz SVM Freq.

Winding Specs.

## Hummie’s V2 Motors (12 Pole, *Wye???*, 90 kv)

I interpert this to mean that his 90 kv model is 24.75 Awg, 1 Strand, 30 Turns.

6Khz SVM Freq.

20Khz SVM Freq.

Winding Specs.

## Hummie’s V2 Motors (12 Pole, *Wye???*, 100 kv)

I interpert this to mean that his 100 kv model is Awg, 1 Strand, 27 Turns.

6Khz SVM Freq.

20Khz SVM Freq.

Winding Specs.

## Reference:

VESC: Sinusiosal SVM 20,000hz switching

Torque for 80mm Wheel to stall/equal to gravity with a 100kg load: 05% - 3.9Nm total (or 3.9/2 Nm per motor) 10% - 7.8Nm total 15% - 12Nm total 20% - 15Nm total 25% - 19Nm total

RPM/Speed for 80mm Wheel: 0560 - 05 mph / 8.1 kmh 1100 - 10 mph / 16 kmh 1600 - 15 mph / 24 kmh 2100 - 20 mph / 32 kmh 2700 - 25 mph / 40 kmh

For the same max current, Jacob’s Hubs are superior. That does not mean that they are without fault. The losses are significantly lower however. -KM