Monday, January 5, 2015

Re: [Electric Boats] Re: running the motor on genset

 

you could make a small battery bank with used cells from a wrecked hybrid vehicle.
The prius and the ford escape use NIMH.
NIMH seems to perform best, for fast recharge and high current output.
Used ford escape packs can be purchased from wreckers for around 350.00.
They have 250 C size cells rated at 5.5Ah each.
They are packaged in groups of 6 volt packs inside the main pack.

The small battery pack would be nice while docking, as the generator would not be needed.

Mark

From: "John Acord jcacord@gmail.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Saturday, January 3, 2015 9:10 PM
Subject: [Electric Boats] Re: running the motor on genset

 
Larry,

That sounds like it would have been a Ward Leonard system where the generator armature and motor armature are wired in a loop, resistance control of generator and motor fields controlling the speed.  Similar to elevators of that vintage but the elevator system used an AC line motor to drive the DC generator.  Pretty clunky control system by today's standards.

I suppose you could run a DC motor in a boat in some sort of similar fashion but find it hard to think of a good way of varying the generator output directly to control the motor, especially smooth acceleration and response to load changes.

Electronic controls for DC motors are exceptionally good these days but they expect to have a constant voltage that is capable of large rapid swings in current.  Batteries are very good at that!! 

I've not gotten there yet, still building my system (DC motor, batteries and a generator), but I don't think you would need a very large battery bank to provide the rapid current response along with a good size generator to keep them full.  The batteries should last a long time as they would never be discharged very much.

John



 

--
Flatwater Electronics
www.flatwaterfarm.com
"Neurosurgery for computer looms."


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Posted by: Mark F <mark.internet@yahoo.ca>
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