section_path: Inputs/Power supply
section_name: Power supply
paragraph_text: Power supply
  
  A DC motor is usually supplied through a split ring commutator as described above.
  
  AC motors' commutation can be achieved using either a slip ring commutator or external commutation. It can be fixed-speed or variable-speed control type, and can be synchronous or asynchronous. Universal motors can run on either AC or DC.