OK, I knew I had one more question for all you motor experts!  Why is 
it that a series motor will keep on going faster and faster and finally 
explode if given adequate voltage unloaded?  Plus, if we have this back 
EMF stuff, where does it go if you take the load away?  Wouldn't there 
be an upper limit on the RPMs because of the BEMF, or is that upper 
limit a bit high for our commutator?

        Seth



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