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Old 10-20-2012, 02:39 AM   #5 (permalink)
Ryland
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How big is this motor? a lot of people go by diameter alone, but if it has the kind of forced cooling you talk about then it might be a higher output... but then again that is with the forced cooling! over heating any motor will kill it.
Bottom line of course is that under sizing your controller will be a bad idea and that higher voltage with a controller/battery pack is better then lower, a 72v 400amp speed controller is not enough for a car, golf cart sure, but not a car, a 144v 500amp speed controller will work for a lot of cars but people who ask a lot of their car will find it to be lacking, you are not going to find many lead acid batteries that can discharge past 600 amps for more then a few seconds but if your controller can't handle that much you will feel it, lithium on the other hand is more likely to be able to handle high discharge rates like that but still going with higher voltage is always nice, it keeps the wire size small.
Most motors can handle higher voltage... until they burn up and that is where cooling comes in, finding someone who knows what your motor can handle is going to be really hard, so get some thermocouples and find out for your self how hot it gets and unless you can find something saying it can handle over 350F then keep it under that.
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