Electrical Drives

a) Draw the speed-torque characteristics of D.C series motor.

Write short note on:

b) Stepper motor

Write short note on:

a) Switched reluctance motor (SRM) drive

b) Drive the expressions for the emf and torque of a PMBLDC motor

a) Write the classifications of PWM techniques.

b) Describe the solid state stator voltage control technique for the speed control of three phase induction motor.

a) Eplain variable frequency method for controlling speed of induction motor .

b) Discuss about the speed-torque characteristics of three phase induction motor with necessary equation.

a) Explain the various methods of braking of induction motors.

b) Explain different electrical braking methods used in electrical drive and explain the method applied to dc shunt motor.

a) With the neat circuit diagram, explain chopper fed four quadrant dc drives.

b) With the block diagram, examine the operation of armature and field control of DC motor drive using controlled rectifiers.

a) Discuss the factors that can influence the choice of motor to drive the load.

b) Explain the merits and demerits of ac and ac drives.

a) Describe the method of estimating equivalent continuous power rating of a motor for short time load application.

b) Write a brief note on classes of duty for an electric motor.

a) Explain the selection of power rating for drive motors with regard to thermal overloading and load variation factors.

g) Compare the Static Kramer and Scherbius System.

f) List the application of chopper fed DC drives.

e) What are the three types of BLDC linear motor?

d) What is thermal overloading?

c) explain electrical and mechanical characteristics of dc series motor.

b) What are the applications of electric drive?