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H192011 Pages: 2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

EIGHTH SEMESTER B.TECH DEGREE EXAMINATION(S), OCTOBER 2019

Course Code: EE402
Course Name: SPECIAL ELECTRIC MACHINES

PARTA

Answer all questions, each carries 5 marks.
Explain the constructional details and importance of Drag Cup Servomotor
Explain the dynamic characteristics of stepper motor.
What are the advantages and limitations of Universal motor?
Draw and explain n+l switches and diode configuration power converter for
SRM
Compare Mechanical Commutation and Electronic Commutation?
Differentiate trapezoidal type BLDC motor and sinusoidal type PMBLDC motor
Write short note on linear synchronous motor.

List the application of linear motor

PART B
Answer any two full questions, each carries 10 marks.

List the applications of Servomotors

With relevant diagrams explain armature controlled DC Servomotors

With neat sketches, explain the constructional details and working principle of
variable reluctance stepper motor. List any four applications of stepper motor.
Compare the performance of AC and DC servo motors

Discuss 2 phase ON mode excitation of three phase and four phase stepper

motors

PART C
Answer any two full questions, each carries 10 marks.
Why compensating winding is used in AC series motor? Draw series motor with
different types of compensating windings

Discuss the torque speed characteristics of hysteresis motor

With neat sketches explain the construction and operation of 8/6 SRM

Page lof 2

Duration: 3 Hours

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