Thanks, I understand. In addition to adjusting the
generator/alternator, can they also adjust the output of the diesel?
In other words, can 893 rpm produce, say, 1000hp when it is given
less fuel under minimum load and produce 3000 under maximum load with
a lot of fuel?
--- In BRHSlist@yahoogroups.com, "Russell Strodtz" <vlbg@e...> wrote:
> Engine RPM can not be directly correlated to HP output.
>
> As has been mentioned before in this forum neither the
> traction motors or the main alternator have built in fields
> with permanent magnets.
>
> Power output of a constant speed diesel-electric can be
> controlled by adjusting the current level applied to the
> field excitation of the main alternator.
>
> Constant speed diesel-electrics have been experimented with
> for freight locomotives but the fuel penalty is just a little
> too high.
>
> Constant speed diesel-electrics are, pretty much, only used
> in passenger operations. The lighting, heating, and air
> conditioning needs of just about all modern passenger equipment
> are supplied by trainlined electrical cables connecting to the
> locomotives. In the case of some locomotives there is a separate
> diesel-electric power supply that handles this task. On some
> others the equipment's power needs are supplied by another
> alternator connected to the diesel used for propulsion.
>
> Since the equipment's needs stay the same whether the train is
> moving or not the constant speed diesel is necessary.
>
> Think about standard rapid transit equipment. Every time there
> is a gap in the third rail at a switch or something the lights
> briefly go out. This is not a problem since the gaps are short
> and the train is still moving and very shortly picks the power
> back up again.
>
> A loss of services at station stops or a reduction in available
> power going downhill or drifting would not be acceptable in
> passenger service.
>
> Russ
> ----- Original Message -----
> From: wollffee
> To: BRHSlist@yahoogroups.com
> Sent: Friday, 07 November, 2003 09:22
> Subject: [BRHSlist] How does an F40PH work?
>
>
> I found the operators manual for this loco and it states that the
> engine runs at 893 RPM at ALL times during normal ops. Yet, it
still
> has the normal 8 power setting positions. If the motor always
runs
> at full speed, how is power to the wheels adjusted?
>
>
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