The document details a call for research projects aimed at final year engineering students specializing in electrical and electronics disciplines, emphasizing the guidance of experts in assembling hardware for projects related to vector control of induction motors. It discusses the historical development of polyphase induction machines, the advantages of vector control, and introduces various controllers, including PI, PID, and fuzzy logic controllers, with their operational principles and applications. Additionally, it includes literature references to foundational works in the field, highlighting the importance of control techniques in achieving effective motor performance.

1. EXPERT SYSTEMS AND SOLUTIONS
Email: expertsyssol@gmail.com
expertsyssol@yahoo.com
Cell: 9952749533
www.researchprojects.info
PAIYANOOR, OMR, CHENNAI
Call For Research Projects Final
year students of B.E in EEE, ECE,
EI, M.E (Power Systems), M.E
(Applied Electronics), M.E (Power
Electronics)
Ph.D Electrical and Electronics.
Students can assemble their hardware in our
Research labs. Experts will be guiding the
projects.

2. Control of Induction Motor
Under the Guidance
of
Prof.Pramod Agarwal
Dr.Sumit Ghatak Choudhri

3. INTRODUCTION TO VECTOR
Nikola Tesla in 1880 introduced the concept of
PolyPhase Induction Machine, from which the
world has witnessed continued growth in the use
of Induction Machine
Three phase induction motors has been mainly
preferred for is simplicity, robustness and
maintenance free operation
But for variable speed drive normally D.C drives
are preferred . The main problem with D.C
drives is the time to time maintenance of the
commutators, brushes and brush holders

5. Problems with scalar Control
At frequencies higher than the rated value,
the constant V/Hz principle also have to
be violated because, to avoid insulation
break down, the stator voltage must not
exceed its rated value

6. WHAT IS VECTOR CONTROL
Vector control mode is defined as a control
technique in which two equivalent control signals
are produced to control Flux and Torque in
decoupled Manner.
both the magnetic field and the torque
developed in the motor can be controlled
independently;
Optimal conditions for torque productions,
resulting in the maximum torque per unit
ampere, occur in the motor both in the steady
state conditions and transient conditions of an
operation.

8. Direct and Indirect
Direct Method Indirect Method
hall effect no direct
transducers are used measurement is done
to obtain rotor flux but a larger
computation is used

9. Typical hardware layout of FOC
system

10. V/F CONTROL
Problems with scalar
Control
At frequencies higher
than the rated value, the
constant V/Hz principle
also have to be violated
because, to avoid
insulation break down,
the stator voltage must
not exceed its rated value

11. SPACE PHASOR

12. Clarke Transformation

13. PARK TRANSFORMATION

14. PHASOR DIAGRAM OF VECTOR
CONTROL

15. Flux Orientation Methods
Rotor flux orientation
It gives a natural decoupling control
Stator flux orientation
It gives a coupling effect which needs to be
compensated by a decoupling compensation
current
Air gap flux orientation
It gives a coupling effect which needs to be
compensated by a decoupling compensation
current

18. PWM MERITS AND DEMERITS
MERTS
Relatively simple and robust Power circuit
Low Manufacturing Cost
Simple Voltage and Current Control techinques
Demerits
Most PWM inverters operate at low and medium
switching frequency levels; a reason for this is that
such converters need to switch rapidly to minimize
loss. Any attempt to increase switching frequencies
will also follow in an increase of switching loss and an
increase in the generation of electromagnetic
interference.

19. Speed Controller
ω e (n) = ω n* - ω n
Speed Controller takes speed error as input
and output Torque Value
Types of Speed Controllers
PI Controller
PID Controller
Fuzzy Controller

20. PI controller
K P and K i are
proportional and integral
gain parameters of the
PI speed controller
T (n) = T (n-1) * + KP [ω re (n) - ω re(n-1) ] + K i ω re (n)

21. PID Controller
T (n) = T (n-1) * +KP [ω re(n) - ω re(n-1) ] + K i ω re(n) +
K d [ω re (n) - 2 ω re(n-1) + ω re(n-2) ]

22. Fuzzy Logic Controller

23. Modelling

24. Modeling

25. The Concept of Space Vector

26. BLOCK DIAGRAM OF INDUCTION
MOTOR

29. SPEED SENSORLESS DRIVE
Reduction of Hardware
Increased Mechanical robustness
Higher reliability
Unaffected machine Inertia

30. INDUCTION MOTOR

31. DOL STARTER MODEL IN
MATLAB

32. SIMULATED STARTING
RESPONSE OF A 1HP MACHINE
Stator Voltage
Van,Vbn,Vcn
500
0
-500
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Stator Currents
20
Ia Ib Ic
0
-20
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Speed
4000
Wm
2000
0
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Torque
20
TL TE
0
-20
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
Time --->

33. REVERSAL and RE-REVERSAL
S ta tor V olta ge
500
V an,V bn,V cn
0
-500
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
S ta tor Curre nts
20
Ia Ib Ic
0
-20
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
S pe e d
5000
0
Wm
-5000
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Torque
50
TL TE
0
-50
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Tim e --->

34. Load Perturbations
Stator Voltage
500
Van,Vbn,Vcn
0
-500
3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Stator Currents
5
Ia Ib Ic
0
-5
3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Speed
4000
Wm
2000
0
3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Torque
5
TL TE
0
-5
3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Time --->

40. LITERATURE SURVEY
F. Blaschke, ”The principle of field orientation as applied to the new TRANSVEKTOR closed-loop control for
rotating field machines,” Siemens Review, pp. 217-220, 1972.
Review,
G.Diana, R.G. Harley, “ An aid for teaching field oriented control applied to Induction Machines,” IEEE Trans.
on Power Systems, Vol. 4, no.3, pp.1258-1262, Aug 1989
Systems,
James A. Norris, “ Vector Control of A.C Motors,” in Proc. 1993 IEEE Textile, Fibre and Film Industry
Technical Conf., pp. 3/1 – 3/8.
Conf.,
W.Leonard, “ Field Oriented for Controlling AC Machine-Principle and Applications,” in Proc. 1988 Power
Electronics and variable Speed Drives Conf., pp.277-282
Conf.,
B.K.Bose, Power Electronics and A.C Drives, New Jersey, Prentice-Hall, 1986
Drives,
P.C Krause, Analysis of Electrical machinery, New York; McGraw-Hill 1986.
machinery,
J. Murphy and E Turnbull, Power Electronic control of A.C Motors. Oxford,U.K., Pergamon Press, 1988.
Power
S.Yamamura, AC Motor for High Performance Applications, Analysis and Control, New York, Marcel dekker,
Control,
1986
R.Krishnan, Electric Motor Drives Modeling Analysis and Control , Pearson Education, New Delhi, India, 2003
J.W.Finch, “ Scalar and vector : a simplified treatment of induction motors performance,” in Proc. 1998 IEE
vector control colloquium, pp2/1- 2/4.
colloquium,
C.C Lee, “ Fuzzy logic on Control System Part-I,” IEEE Trans. on Systems, Manual Cybernetics, vol.20, no.2,
Cybernetics,
pp.404-418, Mar/Apr 1990
C.C Lee, “ Fuzzy logic on Control System Part-II,” IEEE Trans. on Systems, Manual Cybernetics, vol.20, no.2,
Cybernetics,
pp.404-418, Mar/Apr 1990
Hellendoom H. and C. Thomas, “Defuzzifications in Fuzzy controllers”, Intelligence and Fuzzy Systems, Vol.
1, 28-30 1996. pp. 109-123, 1993.
B.N.Singh, “Investigations on vector Controlled Induction Motor Drive,” Ph.D dissertation, Dept. of Electrical
Eng., Indian Institute of Technology, Delhi. India. 1995.
S.Ghatak Choudhuri, “Analysis and Development of vector Control of Induction Motor Drive,” Ph.D
dissertation, Dept. of Electrical Eng., Indian Institute of Technology, Delhi. India. 2004.