i am building up from scratch so i can provide whatever prop would work best.... don't bldc and pmac motors both develop full torque at any rpm.... if so and neglecting cooling for the moment, wouldn't even a 1% friction based loss in efficiency be unnecessary when using these motors as direct connects... using a belt also produces a side pressure load on the bearings that would seemingly be unnecessary with a direct coupling.....
i really do not know and ask because i wish to understand what i may be fundamentally misunderstanding
From: danbollinger <no_reply@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, September 6, 2011 9:31 PM
Subject: [Electric Boats] Re: belt drives vs directly coupled motor shafts and torque
Cogged belts are very efficient. And, when you realize that they can be used to match the motor's and prop's most efficient rpm, they can contribute to a drive system that is MORE efficient than a direct drive between the same components.
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