Have any of the vendors looked at motors from Magnomatics?
They are BLDC motors that have integrated magnetic gearing for an effective direct-drive coupling at a claimed 97% efficiency.
http://www.magnomatics.com/pages/applications/marine-propulsion.htm
http://www.magnomatics.com/pages/technology/pseudo-direct-drive.htm
A big plus is the reduction of moving parts, even smaller footprint, near elimination of contacting parts and no need for lubrication in the transmission. It looks like one of these motors and a thrust bearing would be all that's required between the controller and the output shaft.
Since it is driven as a regular BLDC motor, it would work with existing readily available controllers from Kelly and Sevcon, would just need to be characterized for the controller.
Of course, I assume this all comes at a pretty high cost, which is understandable, considering the engineering research and development costs that need to be recouped.
It looks like their MAGSPLIT hybrid drive works similarly to the Solomon Technologies motors (which are built by Homewood). These were essentially two electric motors connected through a planetary gear. One motor on the sun gear, one motor on the ring gear and the output shaft on the planet carrier. The Magnomatics MAGSPLIT has all of this except the sun motor, which is intended for the ICE connection.
At any reate, it would be great to see this technology available from one of the electric conversion vendors here. Any of you have this in their sights?
Cheers,
/Jason
Posted by: jt.yahoo@jtaylor.ca
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