Re: Scrap HST2

On 12 Aug 2006 03:53:14 -0700 someone who may be "D7666"
<d7666@xxxxxxxxxxx> wrote this:-

There is really no need for CoCo.

I remain unconvinced.

Power electronics have moved forward much in the last decade. Siemens
ES64xyz are 6400 kW continuous rating under 25 kV AC - that is more
than a 92, and is more than a Eurotunnel BoBoBo in original form. The
Bombardier Traxx MS2 are 5600 kW long term but discontinous under AC.

If this was all there was to consider then the complications of
distributing motors along high power EMUs would be avoided by
designers. Rather they would have a high powered motorcoach or two
in the formation, in essence an updated version of the REP/TC
combination.

Asynchronous motors are also inherently less prone
to slipping than a DC motor.

And there is a lot of clever electronics to make wheelslip less of a
problem. However, relatively little can be done about the contact
patch between wheel and rail, no matter how clever the electronics.
When west coast rain starts pouring down the more wheels the better,
whether for hauling a heavy train at medium speed or a light train
at higher speed. Better electronics means that one locomotive can
continue to climb at normal speed, rather than using two just in
case, but there are limits to what it can do.




--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54
.

Relevant Pages

  • Re: Speedometer / Odometer stopped working. Check engine / ABS lights on now
    ... The speedometer meter is an analog meter, driven by electronics in ... the instrument cluster and the input from the tranny speed sensor. ... odometer is basically a digital counter, also driven by pulses from the ... The ABS system relies on sensors located at each wheel, ...
    (rec.autos.makers.mazda.miata)
  • Re: Sega Daytona force feedback wheel issue
    ... First thing would be to change the potentiometer for the steering. ... Electronics usually work or don't work so it should be ... I took apart the steering and there is a 5KOhm POT ... on top and on bottom of the main steering wheel. ...
    (rec.games.video.arcade.collecting)
  • Re: Logic equivalent in electronic
    ... I am builing a digial circuits with inverters, ... http://en.wikipedia.org/wiki/Flip-flop_ (electronics) ... Re-inventing the wheel may be helpful to learn how the wheel is made, ...
    (sci.electronics.basics)
  • Re: Logic equivalent in electronic
    ... I am builing a digial circuits with inverters, ... http://en.wikipedia.org/wiki/Flip-flop_ (electronics) ... Re-inventing the wheel may be helpful to learn how the wheel is made, ...
    (sci.electronics.basics)