No,
but the diesel is still needed to make air for the brake system and heat for
the crew and to keep the batteries charged up and to operate the relays that
make everything work,
the magnets you speak of is the magnetic field of the electrical system which
either generates power or makes resistance without any of the parts actually
touching each other, and dynamics cannot stop the train like the air brakes can
and you still have to use the air brakes, you just add dynamics to it as an
assist, the Seaboard did not buy much dynamics if they had any at all, early
Seaboard engineers used what some people call Seaboard dynamics, they set the
reversers in the opposite direction of travel and used a little throttle to
send reverse current through the traction motors to slow them down, they also
burned up a few traction motors as the system is not designed for that, but
leave it up to a bunch of ex steam engineers to find something to tear up them
diesels that took away their favored steam engines
G
wollffee <wolfee@onebox.com> wrote:
OK, thanks, I think I understand. This means that the diesel is not
used then, right? When the wheels turn, instead of getting pushed by
the magnets in the electric motors, they get the opposite force and
the magnets push AGAINST the direction they are turning, right?
--- In BRHSlist@yahoogroups.com, "gpcom" wrote:
> Dynamic brakes work by turning the motors into generators through a
resistor
> grid. This principle is used on many types of equipment including
large
> overhead cranes. The wheels become the prime mover for the motor
acting as a
> generator and the electrical load applied
> by the resistors applies mechanical load to the wheels causing a
braking
> action without using mechanical or friction brakes, thus there is
no brake
> wear.
> -----Original Message-----
> From: wollffee [mailto:wolfee@o...]
> Sent: Sunday, October 26, 2003 4:06 PM
> To: BRHSlist@yahoogroups.com
> Subject: [BRHSlist] Don't stop now.
> OK, next question. How do dynamic brakes work? Does the diesel
have
> to be turning the generator in order for them to work? Does it turn
> the generator backwards? Please keep in mind that I am the kind of
> guy that has to call an electrician to change light bulbs so don't
> tell me all kinds of complicated stuff, ok?
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