Quote:
Originally Posted by freebeard
My current (ha!) understanding is that DC with a commutator is like greyhound chasing a mechanical rabbit, where polyphase AC is (thanks to the magic of the Right-hand rule) an electrical vortex that drags the rotor arond with it. That leaves brushless DC and single-phase AC for me to 'brush' up on.
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If you take the polyphase AC and replace the AC rotor (laminated steel with conducting bars) with a magnetic rotor (one pair of magnets for each 'pole') .. you have a brushelss DC motor or polyphase DC.
Single phase AC uses a capacitor circuit to offset the single phase at low rpm and generate torque, or uses a second coil inside the stator to perform the same function.
I *HIGHLY* recommend howstuffworks.com for going through the basics ... well illustrated and well described (unlike my descriptions
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