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| Re: Amtrak may Lengthen Acela Express Trainsets to ''Meet Demand'' (673874) | |||
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Re: Amtrak may Lengthen Acela Express Trainsets to ''Meet Demand'' |
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Posted by JournalSquare-K-Car on Thu Aug 28 11:30:32 2008, in response to Re: Amtrak may Lengthen Acela Express Trainsets to ''Meet Demand'', posted by WillD on Thu Aug 28 11:08:13 2008. Well, I read that the ARROW III AC motors had issues of cracking at high speeds. If you stall an AC motor, it can still burn up, by the way, even the field windings can burn up, if not, the rotor can be damaged due to overheating. And by the way, from what I know, there are no permanent magnets in those motors, rather, there are aluminum rods, and the motors run off of induction. Though AC motors are tougher due to their simpler nature, it is still possible to build a tough DC motor. Plus, I don't know how often they service either motor. Note that the R142 MDBFs aren't that great, and R68s outperform them. Maybe it has nothing to do with motors though.Do you know, by any chance, how often the brushes are changed on those motors? I know AC motors are more robust, but their controllers are not so robust... On the other hand, DC motors are not as robust as AC ones, though they are still robust, and the controllers are definately simpler, and more durable than AC controllers. Plus the parts are more interchangeable. |
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