How’s this:
· Hub motor wires enter on the inner portion of the hub and spin their OD. Most boat drives use prop shafts.
· Cost has been an issue historically
· Typically brushless, requiring a brushless controller
· Typically sub-HP power levels
· Typically not used in a reversible mode on a bike---mainly a controller constraint
· RPM high (as you mention)
· Thermal (as you mention) issues might be of concern, but not probably untenable
The high-RPM doesn’t at first seem like a major issue since you could belt drive it to gain torque for speed.
However, for reduction, you’d need a larger pulley than the hub diameter.
You could also gang up hub motors it seems for greater torque.
I think it’d be really neat to have a pair of larger, higher torque hub motors that direct drive a sternwheel or sidewheel on a boat.
It’d be good to know what the price per steady watt rating is achievable with these first.
-Myles Twete, Portland, Or.
From: electricboats@
Sent: Monday, May 17, 2010 1:40 AM
To: electricboats@
Subject: [Electric Boats] ebike hub motors
sorry guys if discussed (search of hub motors=0) but being in China and seeing low price of bike hub motors here begs the question: isn't there a use in our marine world? I assume overheating and too high rpms are the drawback but what else? Ebikes with hub motors and Lithium Ion batteries are getting cheaper.
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