RE: [PSUBS-MAILIST] diesel electric

[MerlinSub@t-online.de]

"Stephen Pearce" <sjpearceqld@bigpond.com> schrieb:
> Frank
>  
 For example a 75KW DC
> motor is in the range of 28K to 30K (USD) new. The AC equivalent is
> about 12K and Reconditioned about 6K.

I have here three DC 40 kw motors from older CNC tool-machinery
- second hand - was 200 USD each. 

The problem are the switch and controllers - not an easy find. 

There are two types of diesel electic drives. 

Type one is full diesel electric : 
prop- e-motor - cabel - controller - e-generator - dieselmotor

If the e-motor fails : no drive
if the controller fails : no drive
if the e generator fails : no drive
if the dieselmotor fails : no drive 

This type one needs a full size diesel, full size generator and full size E-motor
For example for euronaut 100 kw each to run on the surface full speed. 

Type two is semi-diesel-electric
prop - shaft - e-motor/generator - shaft - diesel
if something fails - the other system can take the boat home. 
And the eletric system is designed for underwater drive only. 
Diesel 100 kw - rest 40. 

The second system has more redundancy and is lighter so I choose that. 
But you have to design and build  the shaft and transmissions belts. 

The type one can be build from standard components - and conected just via a cable. 
But is heavier has no redunany and is not cheaper and needs more space because 
of two e-motors and one bigger frequency drives. 
I choose type two.

But I would like to make a new matrix with pro and con for each sub-design. 
Maybe for an electrican with good knowledge of controllers - type one is easier to make than for a more mechanical guy like me. I understand the function of a shaft between prop and diesel 
- but not of a software -progammed - frequency - controller. :-0

regards Carsten 










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