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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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