WHAT IS COMMUTATOR..?

     

DC MACHINE :COMMUTATOR

  

1.               The rotor has a ring-shaped laminated iron core with slots.
   ·     The commutator consists of insulated copper segments mounted on an insulated tube.
   ·        Two brushes are pressed to the commutator to permit current flow.
   ·    The brushes are placed in the neutral zone, where the magnetic field is close to zero, to reduce arcing
   ·     The commutator switches the current from one rotor coil to the adjacent coil The switching requires the interruption of the coil current.
   ·        The sudden interruption of an inductive current generates high voltages .
   ·        The high voltage produces flashover and arcing between the commutator segment and the brush.

FOR MORE DETAILS:CLICK HERE..