WHY DONT AC MOTORS WIGGLE BACK AND FORTH? WHY DO THEY RUN FORWARD, WHEN THE CHARGES IN THE WIRES JUST WIGGLE?
This was Nikola Tesla’s great invention: to use the vibrations of Alternating Current to create a rotating magnetic vortex, then let the magnetic vortex cause a hunk of metal to turn. The rotating magnetic field sweeps through the metal and drags it along. These are called “induction motors.” There’s also another way to do it. Suppose we take a little battery powered motor and remove the magnets. Replace them with electromagnet coils. Connect the coils (and the motor’s rotor) to AC. Now whenever the current reverses, all of the magnetic poles in the motor reverse too, and the motor still spins in the same direction. The “N” attracts the “S”, but when the current reverses direction, the “S” now attracts the “N”, and the motor still turns the same. If you feed AC to that motor, it will keep spinning even though the direction of current is flipping back and forth.
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