Friday, January 2, 2015

Re: [Electric Boats] running the motor on genset

 

In the late 60's, I was stationed on a sub tender in San Diego who's propulsion system was diesel/electric.  A diesel powered generator powering a DC motor directly, no batteries.  The reason for using this system was to eliminate the reduction gear set that would normally have been installed.  I was always told that the Navy did not buy ship reduction gear sets as they were extremely expensive.  And instead, they leased them.
Using the DC motor eliminated the need for any reduction gears.
 
Sent: Friday, January 02, 2015 5:00 PM
Subject: RE: [Electric Boats] running the motor on genset
 
 

This is what I wanted to confirm.
 
Martin

To: electricboats@yahoogroups.com
From: electricboats@yahoogroups.com
Date: Fri, 2 Jan 2015 16:56:00 -0500
Subject: RE: [Electric Boats] running the motor on genset

 
 

In an earlier post, you (or someone else?) said that motors are known to draw more than their rated horsepower on start-up.  That is true if applying full voltage when the motor is at a dead stop.  For example, the blower in your furnace is powered up by applying full power via a relay.  In your case, however, you will be slowly throttling up.  You can easily keep the power below what the generator can provide as the poster below suggests.

 

From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
Sent: Friday, January 02, 2015 4:01 PM
To: electricboats@yahoogroups.com
Subject: RE: [Electric Boats] running the motor on genset

 

I understand that, but what about starting on genset only(without batteries)??

 

Martin

From: no_reply@yahoogroups.com
To: electricboats@yahoogroups.com
Date: Sun, 28 Dec 2014 12:29:10 -0800
Subject: RE: [Electric Boats] running the motor on genset

 

Just don't run them up over 8kw each and it will work.

 

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Posted by: "Larry Doyle" <ldoyle@triad.rr.com>
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