Brushless DC motors are those where the phase windings are held in stator and the permanent magnets are in the rotor. Stator windings are alternately energized using electronic switching circuits instead of mechanical commutation through brushes. BEHAVIOUR OF DC MOTORS: The value of induced back emf due to armature rotation is given by (3) = radial magnetic flux = no. of conductors moving through the magnetic field = revolutions per minute = no. of poles =no. of parallel paths in armature The equivalent circuit of a DC motor is given by: Armature current is given by; =net voltage/net resistance (4) Where =applied voltage across armature conductors = resistance of armature circuit The voltage equation of a motor given by (5) (6) =electrical input to the armature
Brushless DC motors are those where the phase windings are held in stator and the permanent magnets are in the rotor. Stator windings are alternately energized using electronic switching circuits instead of mechanical commutation through brushes. BEHAVIOUR OF DC MOTORS: The value of induced back emf due to armature rotation is given by (3) = radial magnetic flux = no. of conductors moving through the magnetic field = revolutions per minute = no. of poles =no. of parallel paths in armature The equivalent circuit of a DC motor is given by: Armature current is given by; =net voltage/net resistance (4) Where =applied voltage across armature conductors = resistance of armature circuit The voltage equation of a motor given by (5) (6) =electrical input to the armature
Theory.docx