Question

Closed loop speed control of dc motor with inner current loop explain

Answer 1

DC Motor is very extensively used machine where the speed control is desired. The operation of DC motor in different steps is easy compared to AC motors. By the open loop control the DC motor can be operated at any intermediate speed by changing the voltage, armature current etc. But in open loop (Prediction based) control accuracy in speed cannot be obtained i.e. the speed will not be constant for load variations on the motor. There will not be any feedback to the controller to indicate the change in speed due to load. This disadvantage restricts the use of opes loop speed control DC motor in applications where constant speed is essential.