section_path: Inputs/Control
section_name: Control
paragraph_text: Control
  
  DC motors can be operated at variable speeds by adjusting the voltage applied to the terminals or by using pulse-width modulation (PWM).
  
  AC motors operated at a fixed speed are generally powered directly from the grid or through motor soft starters.
  
  AC motors operated at variable speeds are powered with various power inverter, variable-frequency drive or electronic commutator technologies.
  
  The term electronic commutator is usually associated with self-commutated brushless DC motor and switched reluctance motor applications.