RE: [PSUBS-MAILIST] RE: DC Motors

["Jay K. Jeffries" <bottomgun@mindspring.com>]

Carsten,
Sounds like you will be using BIG solid state inverters.  A lot of these are
used on pleasure vessels but I am always very wary of this type of equipment
in critical applications.  The inverters are not water friendly...tend to
let the Magic Smoke out when damp!  Also, they do not produce a perfect sine
wave for critical AC applications and tend to wear out instruments quicker
(better to run instruments on DC if possible).

Recognize that an MG set is another piece of equipment to take up space (and
mess-up your weight and balance calculations).  It is a shame that there are
not small, powerful ones produced.  Hopefully in a few years,
high-temperature superconductor motors will reach the commercial market
resulting in much smaller motors that are VERY efficient.

As an aside, forget the name of the nuclear submarine in new construction
years ago out in Mare Island, California that had a trim issue at the pier
with all hatches (and possibly cut access holes in the deck) open.  Went to
the bottom quick but all of the 110 VAC lights aboard could be seen through
the water to still be working as the motor generator was still producing AC
from the batteries!
R/Jay

-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Carsten
Standfuss
Sent: Tuesday, February 28, 2006 2:31 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] RE: DC Motors

Hi Jay, goor idear but I am sorry, I have not the space for a 40kw AC-DC
MG setup. Also the efficency is with 0,9*0,9 = 0,81 not very hig.
Produce at input 40 kwh just 32,4 kw power and 7,6 kw of heat.. 

best regards Carsten - but is my second option if the black box
Dc400v-Dc600v-Ac400V 0,95% box development fails.. 





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