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Actually I think I have comingled three numbers:

  • AC traction motor slip ratio, up to 45%, which is the ratio of the rotating speed of the electric fields in the motor to the armature.
  • Locomotive wheel slip ratio, up to 25%, which is how far the wheel goes in comparison to how far the locomotive goes.
  • Locomotive tractive effort ratio, up to 30%, which is the tractive force compared to the weight of the locomotive.

Anyway, they're all impressively large numbers...  :-)
by asdf on Sat Dec 13th, 2008 at 10:44:20 AM EST
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... and the ratio of tractive force to the weight of the locomotive changes ... that's part of the gain, that adding the same tractive force does not add the same weight, because the generator is not carried along for the ride.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.
by BruceMcF (agila61 at netscape dot net) on Sat Dec 13th, 2008 at 01:13:58 PM EST
[ Parent ]

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