Next message: (no name): "Re: lv-ab: Power Company Alternators"
In a message dated 2/1/02 9:07:34 PM Eastern Standard Time,
writes:
>
> A long time ago I read about an electronically controlled AC power
> generator that could control the frequency it puts out electronically
> without depending on the rotation speed. Do such things exist, or was
> this yet another great idea that never made it to the real world?
>
>
Several containerships I worked aboard just before retiring had an alternator
built around the propellor shaft. The rotor was on the propellor shaft and
many stator coils surrounded it. After the ship got up to sea speed the unit
was turned on. It generated "wild" ac which was then rectified into DC and
fed to a monster inverter that produced 440 vac, 3 phase, 60 Hz. This power
source was used to power the many reefer boxes (40 foot refrigerated
containers) that the ship carried and allowed the engineers to shut down all
but one of the 1200 rpm diesel gensets which carried the load in port. This
was for economy because the gensets used expensive light diesel while the
main engine used cheaper bunker C after it was started and warmed up. The
majority of the engineers routine work involved maintaining the bunker C
preconditiong equipment, mostly filters and heaters.
Norm
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