Syllabus for Mid semester (6th sem) : Electrical Drives and Control 2160912

Syllabus for first MID semester Examination:

Electrical Drives and Control 2160912

1. Introduction:

 •            History Of DC Drive -Electronic Control -Solid State Control

•             State Of Art Of DC Drive

•             Block Diagram Of Drive

•             Components Of Electrical Drive and their functions

 2. Dynamics of Electrical Drives

·                     Types of Load-Quadratal diagram of speed

·                     Torque characteristics –

·                     Types and Characteristics of load torque –

·                     Dynamics of motor- load combination –

·                     steady state & transient stability of an electrical drive –

·                     Determination of moment of inertia- Load equalization

3. DC drives Speed-torque characteristics

·                     DC separately excited, shunt and series motors

·                      Modified speed-torque characteristics with resistive control

·                      Analysis for speed-torque equations in terms of firing angle and duty cycle;

·                     Modified speed-torque characteristics with phase controlled converters and DC-DC converters for continuous conduction and discontinuous conduction

·                      Closed loop speed control schemes

·                     Dynamic model of DC machine

·                      Speed and position control scheme using the dynamic model

4. Scalar control of AC machines

·                     Review of V/f control

·                      VSI based Induction Motor control

·                      Harmonics and Harmonic torques with VSI

·                     Selection of carrier frequency and harmonic spectrum

·                     Advantages of V/f control over other scalar control techniques

·                     Various operating modes for doubly fed induction machine: Sub-synchronous and super-synchronous motoring and generating

·                      Static Scherbius drive: Design aspects like speed range, power factor, ratings of components

·                     Closed-loop speed control schemes: slip control, current limit control

·                      CSI fed IM

·                      Speed-torque characteristics with current source

 Comparison with VSI based control 

Syllabus for second MID semester Examination:
Above syllabus + 

6. Applications of Electric Drives

·                     Introduction to Solar and battery powered Drives;

·                     Introduction to traction Drives;

·                     Servo motor drive requirement – control and implementation

Question Bank( Electrical Drives &Control)

Unit :1

1) Enlist advantages of electrical drives.

2) State essential part of electrical drives.

3) What are the functions of power modulator?

4) Draw block diagram of electrical drive and explain briefly function of each block.

5) What is electrical drive?

6) Enlist factors to be considered for selection of electrical drive.

Unit :2

1) Explain different types of load on electrical drives.

2) Explain quadrilateral diagram of speed and torque characteristic (four quadrant operation)

3) Write a note on load torque and its classification.

4) Dynamic equation of motor load combination.

5) Determination of moment of inertia of a motor.

6) Write a note on stability of an electrical drive.

7) Write a note on load equalisation.

Unit :3

1) Explain speed torque characteristics of separately excited D.C. motor.

2) Explain speed torque characteristic of DC shunt motor.

3) Explain speed torque characteristic of DC series motor.

4) Explain speed torque characteristic of PMDC motor.

5) Explain dynamic model of DC motor drive.

6) Explain speed control methods of DC series motor.

7) Explain speed control methods of DC shunt motor.

8) Explain ward leonard method of speed control.

9) Explain the 1-ɸ half wave converter drive for the speed control of separately excited dc motor with waveform.

10) Explain the 1-ɸ full wave converter drive for the speed control of separately excited dc motor with waveform.

11) Explain the 1-ɸ semi converter drive for the speed control of separately excited dc motor with waveform.

12) Explain the 1-ɸ dual converter  drive for the speed control of separately excited dc motor with waveform.

13) Explain the 3-ɸ half wave converter drive for the speed control of separately excited dc motor with waveforms at α=30˚, α=150˚.

14) Explain chopper controlled drive operation modes for the speed control of separately excited dc motor with waveform.

15) Explain principle of regenerative barking and speed control (2^nd quadrant operation) of drive using chopper.

16) Explain working of 2-quadrant operation of drive using chopper.(1^st and 2^nd quadrant operation)

17) Give 3points of comparison between converter fed dc drives and chopper fed dc drives.

18) Explain speed and position control scheme of dc motor using dynamic model of dc motor.

Unit :4

1) Explain speed torque characteristics of separately excited D.C. induction mortor.

2) Explain stator voltage control of induction motor.

3) Explain V/f control of induction motor.

4) Explain the effect of non sinusoidal supply on VSI

 5) Explain unipolar and bipolar PWM method for inverter.

6) Explain speed control methods of DC series motor.

7) Explain speed control methods of DC shunt motor.

8) Explain ward leonard method of speed control.

9) Enlist advantages of V/f control.

10) Explain the operating modes of doubly fed induction machine.

11) Explain working of static scherbius drive.

12) Explain closed loop speed control of induction motor using slip control scheme.

13) Explain closed loop speed control of induction motor using current limit control scheme.

14) Explain closed loop speed control of CSI fed induction motor drive.

15) Give 7 points of comparison between CSI and VSI.

Solve numericals based on theory and formulas used in chapter 2,3 and 4.