[modeleng] Re: Electric Traction Problems
- From: "John Pagett" <john_pagett@xxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Thu, 5 Apr 2007 21:24:09 +0100
While we are on the subject of electronic controllers...
Quite a few claim to be regenerative. That is, they will put energy back
into the batteries whilst using the motor as a brake.
Usually, our battery locos use permanent magnet motors. At full speed, the
back emf generated by the motor will be a little less that the supply
voltage. As the loco slows down, this voltage will fall, so how can it be
sufficient to "push" current back into the battery? I know that chopping the
current will produce inductive spikes which would be sufficient to overcome
the battery voltage, but is that how they do it?
JohnP
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