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[quote]QUOTE: <i>Originally posted by chad thomas</i> <br /><br />Yes, they do fail. And when they do it can be quite a show of arcs and sparks accented by the smell of acrid smoke. <br /> <br />DC traction motors have a minimum continious speed rating. Below this speed you go into what's called "short time rating". The slower you go the shorter the time. Depending on the gearing of the traction motor at say 11mph you might have a short time rating of 1/2 hour. That means you can go that slow for up to a half hour without significant risk of damage. The short time ratings are usually marked on the ampmeter in there corrisponding ranges so when you look at it you can see what short time rating your currently at. <br /> <br />AC traction motors do not generate that much heat at low speed and do not have a short time rating. Therefore a AC unit could pull max tractive effort all the way down to 0 mph. <br />[/quote] <br /> <br />Interesting <br /> <br />when that happens (the "show") can it be dangerous to stand near the wheels?
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