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Separately excited drives

SEPARATELY EXCITED DRIVES

The static drives are classified into many types. In this unit we conclude only two types of static drives namely separately excited and series. These are further classified into two types namely single phase semi and full converter, three phase semi and full converter. To understand the better view observe the below slide.


The separately excited dc motors means the motors which operates through excitation given by the external circuit or machine. These type of motors are not self excited. The separately excited dc motor drive is given in below figure.


The voltage of an armature is controlled by a semi converter or full converter when the circuit is fed with AC supply.
*The back emf of motor is indicated by eb
*The Armature resistance is indicated by Ra
*The Armature inductance is indicated by La
The torque equation and speed formula for separately excited drives are given below:


Advantages of freewheeling diode:
1. Continues current operation
2. Increase in system efficiency and stability gain
3. High gain accuracy.



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