Ask
Login
0
12kviews
Compare DC motor and Induction Motor
written 6.2 years ago by gravatar for ypsukale ypsukale • 50 modified 2.2 years ago by gravatar for Krishna_Agrawal Krishna_Agrawal • 2.6k
industrial electronics
ADD COMMENT EDIT
1 Answer
0
728views
written 2.2 years ago by gravatar for Krishna_Agrawal Krishna_Agrawal • 2.6k


Difference between Induction Motor and DC Motor : -

Sr.No Topic Induction Motor DC Motor
1 Definition Inductions motors can be defined as an electric motor which is driven by an alternating current (AC). DC motors is also a rotatory electric motor that converts Direct current (DC energy) into mechanical energy.
2 Types Induction motors are mainly of two types which are synchronous AC motors and induction motors. DC motors are also mainly of two types which are namely DC motors with brushes and DC motors without brushes.
3 Current Input Induction motors only run when an alternating current is given as input. DC motors will only run when DC supply is given. In the case of DC series motor, the motor might run with AC supply. But, for shunt motors, the motor never runs on AC supply.
4 Commutators and Brushes Commutators and brushes are absent in Induction motors. Commutators and carbon brushes are present in DC motors.
5 Input Supply Phases Induction motors can run on both single-phase and three-phase supplies. DC motors can run only on single-phase supply.
6 Supply Sources Three phase or single phase power from the supply mains. Energy is obtained from batteries, cells etc.
7 Starting of Motor A three-phase Induction motor is self-starting but a single-phase AC motor requires a starting mechanism. DC motors are always self-starting in nature.
8 Input Terminals In Induction motors, three input terminals (RYB) is present. In DC motors, two input terminals (positive and negative) are present.
9 Armature Characteristics In Induction motors, the armature is stationary while the magnetic field rotates. In DC motors, the armature rotates while the magnetic field remains stationary.
10 Speed Control The speed of an Induction motor can be changed by varying the frequency. In the case of DC motors, speed can be controlled by changing the armature winding’s current.
11 Load Change Induction motors show a slow response to the change in load. DC motors show a quick response to the change in load.
12 Starting Induction Motor are not self starting. It requires some external starting equipments. DC motors are self starting.
13 Life Expectancy Since Induction motors do not have brushes and commutators, they are very rigged and have a high life expectancy. The brushes and commutators in DC motors limit the speed and reduce the life expectancy of the motor.
14 Efficiency Due to induction current loss and motor slip, the efficiency of the Induction motor is less. The efficiency of the DC motor is high as there is no slip and induction current loss.
15 Maintenance Induction motors require less maintenance as brushes and commutators are absent. DC motors require excessive maintenance due to the presence of brushes and commutators.
16 Applications Induction motors are required where there is a need for high speed and variable torque. DC motors are required where there is a need for variable speed and high torque.
17 Practical Uses They are mainly used in large industries. They are mainly used in small domestic appliances.



enter image description here
ADD COMMENT EDIT
Please log in to add an answer.