{HEAD ~ Three changes} in {TAIL ~ magnet current} rotate the rotor to three successive stable positions, the third position being achieved when both magnets are energized to complete one step of the motor and then poles are again induced to start another step if desired 
{ HEAD ~ Three changes } in { TAIL ~ magnet current } rotate the rotor to three successive stable positions , the third position being achieved when both magnets are energized to complete one step of the motor and then poles are again induced to start another step if desired
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