Those lil DC motors use a permanent magnet as the Field which has a fixed magnetic North/South Polarity,,,,,,,,,therefore when you reverse the electrical polarity in the armature its resultant generated North South magnetic polarity changes so the magnetic forces turn it the opposite direction....
If you use electric current to create the magnetic field by its turns around a soft iron core, its resulatant North/South magnetic polarity is of one orientation depending on direction of current flow and likewise in the armature and it turns one particualr way buttttttttttttttttt even if you swap polarIty it (CURRENT FLOW) changes in BOTH Armature and Filed so they do not change RELATIVE TO EACH OTHER so it still turns same way. To reverse it you have to swap winding ends so flow is changed in only ONE and then it will indeed reverse
Hope that helps a little, and before someone wants to jump all over this brief explanation, remember I cant put perfectly accurate in a paragraph what it can take a book to fill lol so there
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Today's Featured Article - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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