Smallest inwheel motor

[Fundog]

Hey everybody.

There's been a lot of in-wheel skateboard motors as of recent, but these motors are relatively large so the wheels end up fairly large as well e.g. 80 mm+ diameter. I am wondering if there such a thing as a compact, direct-drive, in-wheel skateboard motor? I am well aware that in-wheel motors are essentially low-KV BLDC motors, and that low diameter motors and low-KV motors do not mix well. My question is, what's the smallest feasible direct drive motor in terms of motor diameter?

I have found a 70 mm direct drive skateboard wheel from a chinese manufacturer, but the performance rating is abysmal and it appears some of the ratings are falsified.
http://loftyambition.en.alibaba.com/product/60405663866-801618327/Lightest_electric_skateboard_with_smaller_in_wheel_motor_hub_motor.html
What I can gather from this, is that the motor was 55 mm diameter and 55 mm in can length. Has anyone successfully used a 55 mm direct drive motor on an e-board before?

What I am looking for is a compact in-wheel motor, not really the ones commonly featured on this forum. This in-wheel motor doesn't have to be all that powerful, it just needs to have a decent top speed and hill climbing gradient, so essentially performance isn't my top priority.

 

[cmatson]

hummie's motor is pretty small- not sure exactly, but smaller than carvon's or jacobs.

 

[Hummina Shadeeba]

80mm x 56. Same as kegel.

 

[bandaro]

I have a set of custom 50mm hub motors running some 80mm wheels. They are around the 180 Kv mark, give about 40km/h on 6s. So small-ish and decent. I would also suggest hitting up Vanarian from https://endless-sphere.com/forums/viewtopic.php?f=35&t=65799. He is working with small lightweight ones for his blades, so something similar might work?

 

[Fundog]

Hey everyone and thanks for the replies. Could you all list your motor diameter, can length, peak power and Kv rating, pretty please?

 

[Hummina Shadeeba]

I haven't gotten around to testing the peak power of the hub motors I'm selling but 90kv. 45x25mm stator.

Maybe if u had a really small wheel yet it was long u could get down to a low kv and with the small diameter you'd have lots of leverage as well

 

[Vanarian]

I have a set of custom 50mm hub motors running some 80mm wheels. They are around the 180 Kv mark, give about 40km/h on 6s. So small-ish and decent. I would also suggest hitting up Vanarian from https://endless-sphere.com/forums/viewtopic.php?f=35&t=65799. He is working with small lightweight ones for his blades, so something similar might work?

Haha thank you!

Well my hubs are really designed toward blades so would need re-work for hub skateboarding use .