Deleted
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Post by Deleted on Dec 15, 2005 16:26:55 GMT
Just wondering...... does anyone think that trains will - eventually - have a different system from the reverser, to make the direction change?
Am curious is all
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Post by chris on Dec 15, 2005 18:29:48 GMT
Er....................
I suppose new gadgets will be invented. Eventually they'll become diriverless. I remember having an idea of voice activated trains once. I'll see if i can dig out the post.
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Post by tom2506 on Dec 15, 2005 18:31:54 GMT
If it ain't broken don't fix it. If the reverser's work the way they are why change them?
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Post by dunois on Dec 15, 2005 19:33:47 GMT
In a few years the reversing of the trains in the Paris metro line number 13 (and also in the line 8 some time after) will be fully automated but the method of reversing stay the same.
Approximatly 30/45 sec will be won during peak time hours further increasing the number of trains in theses lines.
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Deleted
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Post by Deleted on Dec 15, 2005 20:06:37 GMT
Bit of an odd question. Are you asking about methods of reversing trains, or the controls to reverse trains? Plus, isn't this posted in the non-train forum?
If it's the former, metro trains can reverse in platforms, headshunts/sidings, passenger loops, and non-passenger loops.
As dunois mentioned, automatic reversing in headshunts/sidings is becoming increasingly common. It can be done on all driverless metros (obviously!), Vienna U-bahn, Hong Kong MTR, Madrid Metro, and soon will be introduced on Line 13 in Paris.
Mod edit: now moved to 'trains technical' by Colin
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Deleted
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Post by Deleted on Dec 16, 2005 16:05:00 GMT
Well i'm curious aren't i ?? ;d
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Post by Deleted on Dec 16, 2005 20:50:15 GMT
Well i'm curious aren't i ?? ;d We still don't quite understand your question though! |
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Post by q8 on Jan 13, 2006 23:26:01 GMT
What Joe means I think is will the actual 'reverser' that changes to polarity and the way the current flows round the motor l be replaced with some other gadget?
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Post by Deleted on Jan 27, 2006 20:28:16 GMT
That is indeed what I am trying to say - thanks Bob  (Apologies - I'm not technical  ) |
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prjb
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LU move customers from A to B, they used to do it via 'C'.
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Post by prjb on Jun 21, 2006 21:09:08 GMT
How to resurrect a Thread without really trying! The reverser barrel as such remains on current and stock as well as the new stock being built/designed. On newer stock we are moving away from putting an actual key into the barrel itself. You do still have a switch with FOR/REV and various other positions though. |
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Post by ribaric on Jun 21, 2006 23:52:33 GMT
Not really sure of the question here, I think's it's about how motor rotation direction is changed?
It used to be done via contacts on a key operated barrel which was mechanically interlocked with the master-controller so that a change of direction was only possible if no motor current was flowing - ie: the M/C was in the shut-off position.
The contacts provided a 50v control supply to an air operated set of contactors (the reverser) which routed traction power in one direction or the other through the field windings - so the motor changed it's rotation direction.
Armature current (the bit that spins) direction was not changed. If the direction of current was changed in both the field and armature windings the motor would continue to spin in the same direction.
This principle is based in fundamental physics so is unlikely to ever change whilst DC traction motors are in use, however the air-operated gear is now replaced by a set up of silicon control devices (SCRs) - used to be called "thyristors" - which are solid state devices. These developed rapidly and effectively wiped away years of testing on the Hainault-Woodford line because the new components did everything the trials were trying to achieve. It must have been how Logie-Baird felt after years of work and expense to create the film television only for the cathode ray tube device to come along and negate everything he'd ever done.
Life can be a bitch sometimes.
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