Is the Leaf Bike 30mm wide stator motor the most underrated motor in the world of ebikes?

[ebike4healthandfitness]

This motor makes the perfect 135mm rear wheel for those using 7 speed freewheel. Not only is dish-less like the old Nine Continent motor but has a greater distance between spoke flanges making for a wheel with much better lateral stiffness.

Furthermore it has a significantly wider stator at 30mm compared to the old Nine Continent 27mm.

Efficiency of the Leaf bike 30mm is also a class leading 90.5%.

What am I missing?

 

[neptronix]

Honestly the dyno graph on this motor is super suspect.
29 inch 48V 52V 1000W rear hub motor wheel

Why do we suddenly get 90.5% efficiency at one specific point in the curve? that's a big jump from the points surrounding it.
Also, the RPM is increasing in every point except this 90.5% efficiency part, where it's actually gone backwards..



Compare this to the 1500W motor, where we hit that high efficiency point, but there's a gradient between the efficiency points. There's also no speed fluctuation..



Another interesting thing in the 1000w dyno graph is that the graphic doesn't show a 90.5% peak, it shows a ~88% peak.. the numbers aren't adding up..



The motor itself is 14lbs and the efficiency looks average for a 30mm stator 9C type design. For another 2lbs you get an exceptional motor that can handle about twice the continuous power and is also substantially more efficient across the power band.

That's why the 30mm leaf doesn't get much if any love on this forum.

 

[ebike4healthandfitness]

That is a good find you made there. I emailed Leaf bike about the discrepancy in the data.

 

[999zip999]

Leaf has a 30 mm stator I thought it was a 35 mm stator ?

 

[ebike4healthandfitness]

Leaf has a 30 mm stator I thought it was a 35 mm stator ?

They have 30mm, 35mm and 42mm.

 

[Bullfrog]

The 42mm stator is only available in the 170/190mm OLD motor..."OLD" is over locknut dimenstion.

I would highly recomend the 35mm motor if you have 135mm dropouts. It can handle a lot more abuse without overheating than the 30mm motor.

 

[ebike4healthandfitness]

The 42mm stator is only available in the 170/190mm OLD motor..."OLD" is over locknut dimenstion.

Leaf bike also told me they think they could do 42mm wide stator with 135mm OLD but it would have to be single speed and couldn't use a disc brake.

This also makes a dish-less wheel with 50mm spacing between outside of spoke flange to outside of spoke flange (which probably works out to 47mm space from center of spoke flange to center of spoke flange).