Difference between AC Motor and DC Motor

 

BASIS	AC MOTOR	DC MOTOR
Nature of the Input Current	Alternating Current is the main input power in the AC motor	Direct Current is the main input power in the DC motor
Supply Sources	Three-phase or single-phase power from the supply mains	Energy is obtained from batteries, cells, etc.
Commutation Process	Absent in AC motor	Present in DC motor
Supply Phase	Both single-phase and three-phase supply are used	Only single-phase supply is used
Number of terminals	There are 3 input terminals RYB.	There are two input terminals Positive and negative
Carbon brushes	No carbon brushes	There are carbon brushes in the DC Motor
Applications	Suitable for large and industrial applications	DC motor is used in small and domestic applications
Starting	AC Motor is not self-starting. It requires some external starting equipment	DC Motor is self-starting
Position of Armature	The Armature is stationary and the magnetic field rotates	The armature rotates while the magnetic field remains stationary.
Maintenance cost	Less expensive as compared to DC Motor	DC Motor maintenance is more expensive.