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04000EE402052004

Pages: 2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Eighth semester B.Tech degree examinations, September 2020

Course Code: EE402
Course Name: Special Electrical Machines

PARTA
Answer all questions, each carries 5 marks.

What is a drag cup servo motor? What is its significance?
With the help of a diagram, explain the construction and working of Hybrid type
stepper motor.
Draw and explain the phasor diagram of an AC series motor.
Explain the torque slip characteristics of a Reluctance motor.
Explain the constructional details of Permanent Magnet DC Motor with relevant
diagrams.
List any five applications of Brushless DC motors.
Write short note on Linear Reluctance Motor.
Explain the working principle of a Linear Synchronous Motor.

PART ‏تا‎

Answer any two full questions, each carries 10 marks.

Enumerate the features of DC servo motor. List two applications of DC servo
motors.
Explain the operation of armature controlled DC servomotor with circuit
diagram.
Explain the principle of operation of an AC Servomotor with the help of a block
diagram.
Describe a unipolar drive circuit for a Permanent Magnet stepper motor.
Draw and explain Static and Dynamic characteristics of a stepper motor.
Explain the construction of multi stack Variable Reluctance Stepper motor with
the help of neat sketches.

PART C

Answer any two full questions, each carries 10 marks.

Give the constructional details and working principle of a hysteresis motor.

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Duration: 3 Hours

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