Question

torque characteristics of dc motor

Answer 1

Torque vs. armature current (Ta-Ia) In case of DC shunt motors, we can assume the field flux ɸ to be constant. Though at heavy loads, ɸ decreases in a small amount due to increased armature reaction. As we are neglecting the change in the flux ɸ, we can say thattorque is proportional to armature current