Advantages And Disadvantages Of Dc Drive System

Advantages And Disadvantages Of Dc Drive System

3.1 Variable Speed Drive System This chapter deals with the classification and basic operation of electric variable speed drive system and scope, merits and demerits of DC and AC drives. Then AC induction motor drive is selected for complete description. Here AC drive system is presented with its components like inverters, position sensors and current controller.



Figure 3.1: Classification of Electric Drive System Above fig. 3.1 shows the complete classification of Modern Electric Drive system. The rings in the above fig. 3.1 show the type of motor and type of converter chosen for doing thesis work. In every industry there are industrial processes of some form that require adjustment for normal operation ... Show more content on Helpwriting.net ...Three–phase induction motor of wound rotor type is commonly used in adjustable–speed drives. According to the type of winding on rotor, there are two common types of induction machines namely, squirrel–cage induction motor and wound–rotor induction motor. Squirrel–cage induction motors are mostly used in industrial drives which have cylindrical rotor with short–circuited rotor windings with the voltage supplied to stator windings. The rotor does not have a brushes and commutator but consists of conducting bars that are placed into the rotor slots. These bars are short circuited by the shorting rings. Whereas wound rotor induction motors have wye–connected rotor windings. In addition to the voltage that is applied to the stator windings, the phase voltages can be supplied to the rotor winding using brushes and slip rings. However, wound–rotor induction motors have not been widely used because their efficiency and maximum angular velocity are lower compared to squirrel–cage. On the other hand, squirrel–cage motors have been tremendously used in high–performance electric drives and electromechanical systems. Therefore, in this thesis, only three phase squirrel–cage induction motor drive is taken and performance analysis has been done using

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