FlexPV 4" hubmotor kit for skateboard/scooter/inlines/bike

[sk8norcal]

http://www.flexpv.cc/
http://www.kickstarter.com/projects/56669829/flexpv-an-open-vehicle-dev-kit-for-everyone
http://www.techinasia.com/flexpv-open-source-electric-motor-kickstarter/
http://www.youtube.com/watch?v=t9AXAT_Jvx4

http://www.makezine.com/2015/04/30/back-kickstarter-teams-last-project-failed/

[youtube]qcUjNCyrx_Y[/youtube]




https://www.uumotor.com/tag/4-inch-hub-motor

http://www.etotheipiplusone.net/?p=3501



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[maxchilton]

neat.

 

[made_in_the_alps_legacy]

36V 200W

 

[Hummina Shadeeba]

surprisingly low wattage for the uumotor less than zero took apart and all their motors. 80mm stator and .3mm airgap and 250 watts? Or 150 watts for the 4 inch one. That's nothing compared to a typical outrunner.

"more stator poles and magnet poles also divides down the mechanical speed of the motor relative to the electrical “speed” more, contributing to torque per amp."

?. I thought adding poles diminishes the area of steel and copper and while you might have more poles they are individually weaker. I thought 12x14 was a magic number for 3 phase in terms of getting torque. I forget where I read it and cant find the link. could've been a dream.

the kickstarter one looks like it needs more rubber and the mount is an insanely monstrous piece of what looks like some kind of construction set for kids I've seen

They're all interesting but I wouldn't want to buy any of them.