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SYLLABUS

Unit-1 :

Introduction Basic elements – Types of electric drives – Factors influencing the choice of electrical drives – Heating and cooling curves – Loading conditions and classes of duty – Selection of power rating for drive motors with regard to thermal overloading and load variation factors.

Unit-2 :

Drive Motor Characteristics Mechanical characteristics – Speed-torque characteristics of various types of load and drive motors – Braking of electrical motors – DC motors: Shunt, series and compound – Single phase and three phase induction motors.

Unit -3:

Starting Methods Types of D.C motor starters – Typical control circuits for shunt and series motors – Three phase squirrel cage and slip ring induction motors.

Unit-4 :

Conventional and Solid State Speed Control of D.C. Drives Speed control of DC series and shunt motors – Armature and field control, Ward-Leonard control system – Using controlled rectifiers and DC choppers – Applications.

Unit-5 :

Conventional and Solid State Speed Control of A.C. Drives Speed control of three phase induction motor – Voltage control, Voltage / frequency control, Slip power recovery scheme – Using inverters and AC voltage regulators – Applications.