There are three main types of DC motors which are
- DC shunt motors,
- DC series motors, and
- DC compound motors.
- The shunt and series type of DC motor has only one field winding on the pole of the Stator, while the compound type has two separate field windings wound on the stator of each pole.
- The performance of a motor can be judged by its characteristic curves known as motor characteristics.
There are basically three important characteristics which are given-
(i) Torque and Armature current characteristic (Ta/Ia)
(ii) Speed and armature current characteristic (N/Ia)
(iii) Speed and torque characteristic (N/Ta)
Torque v/s Armature current characteristic and Speed v/s armature current characteristic are known as staring characteristics while Speed v/s torque characteristic is known as running characteristics.