a comparative analysis of speed control of separately excited dc motors by conventional-2

7/28/2019 A Comparative Analysis of Speed Control of Separately Excited Dc Motors by Conventional-2

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International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976

6545(Print), ISSN 0976 6553(Online) Volume 4, Issue 2, March April (2013), IAEME

229

A COMPARATIVE ANALYSIS OF SPEED CONTROL OF

SEPARATELY EXCITED DC MOTORS BY CONVENTIONAL AND

VARIOUS AI TECHNIQUE BASED CONTROLLERS

Debirupa Hore*

(M.Tech Power and Energy systems, B.E Electrical Engineering)

*Assistant Professor Electrical Engineering Department

KJ Educational Institutes KJCOEMR Pune Maharashtra India

ABSTRACT

This paper presents a comparison of speed control of a separately excited DC motor

using different types of controllers. Conventional controllers are generally used to control the

speed of the separately excited DC motors in various industrial applications. It is found to be

simple and high effective if the load disturbances are small. But during high load or large

variation of load the AI technique based controllers such as proves to be fast and reliable. To

control the speed of the motor a step down chopper is also used. The control scheme of the

motor was tested with convention PI controller following the Fuzzy controller and then

ANFIS Based speed controller. All the responses were analyzed in MATLAB/SIMULINK

environment. The simulation results show that the Artificial Intelligence based speed

controllers gives good performance and high robustness in large load disturbances.

I.INTRODUCTIONDevelopment of high performance motor drives is very essential for industrialapplications. A high performance motor drive system must have good dynamic speed

command tracking and load regulating response. Depending on the application, some of them

have fixed speed and some have variable speed. The variable speed drives, have various

limitations such as poor efficiencies, lower speeds etc. With the advent of power electronics

today we have variable drive systems which are not only smaller in size but also very

efficient, highly reliable and meeting all the stringent demands of the various industries of

modern era. DC motors provide excellent control of speed for acceleration and deceleration.

The power supply of a DC motor connects directly to the field of the motor which allows for

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ISSN 0976 6545(Print)ISSN 0976 6553(Online)

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precise voltage control, and is necessary for speed and torque control applications. DC

drives, because of their simplicity, ease of application, reliability and favorable cost

have long been a backbone of industrial applications. DC drives are less complex as

compared to AC drives system. DC drives are normally less expensive for low horsepowerratings. DC motors have a long tradition of being used as adjustable speed machines and a

wide range of options have evolved for this purpose. Cooling blowers and inlet air flanges

provide cooling air for a wide speed range at constant torque. DC regenerative drives are

available for applications requiring continuous regeneration for overhauling loads. AC drives

with this capability would be more complex and expensive. Properly applied brush and

maintenance of commutator is minimal. DC motors can provide high starting torques which

is required for traction drives. They are also used for mobile equipment such as golf carts,

quarry and mining applications. DC motors are conveniently portable and well fit to

special applications, like industrial equipments and machineries that are not easily run

from remote power sources.

With the advent of thyristors and thyristor power converters the variable voltage to

the dc motor is obtained from static power converters. Phase controlled rectifiers providevariable dc voltage from constant voltage, constant frequency mains. The static apparatus is

very efficient, compact and has a very good dynamic behavior. It is very easy to provide a

four quadrant drive with slight modifications in the converter. A dc chopper can be used to

obtain a variable voltage from a constant dc voltage. The average value of the output voltage

can be varied by varying the time ratio of the chopper.

II.CHOPPERSA DC chopper is a static power electronic device that converts fixed dc input voltage

to a variable dc output voltage. A Chopper may be considered as dc equivalent of an AC

transformer since they behave in an identical manner. As chopper involves one stage

conversion, these are more efficient. Choppers are now being used all over the world for

rapid transit systems. These are also used in trolley cars, battery-operated vehicles, traction-

motor control, and control of induction motors, marine hoists, forklift trucks and mine

haulers. The future electric automobiles are likely to use choppers for their speed control and

braking. Besides, the saving in power, the DC chopper offers greater efficiency, faster

response, lower maintenance, small size, smooth control, regeneration facility and for many

applications, lower cost, than motor-generator sets or gas tubes approaches.

A. PRINCIPLE OF STEP-DOWN CHOPPER (BUCK-CONVERTER) OR CLASS ACHOPPER

A chopper is a high speed ON or OFF semiconductor switch which is consists of

power semiconductor devices, input dc power supply, elements (R, L, C, etc.) and outputload. The average output voltage across the load is controlled by varying on-period and off-

period (or duty cycle) of the switch In fig.1 when chopper CH1 is ON, V 0 = V and current i0flows in the arrow direction shown. When CH1 IS OFF, V0 = 0 but i0 in the load continues

flowing in the same direction through freewheeling diode FD. Hence average values of both

load voltage and current, i.e. V and I0 are always positive as shown by the hatched area in thefirst quadrant ofV-I plane in fig.1 (b). The power flow in type-A chopper is always fromsource to load. This chopper is also called step-down chopper as average output voltage V0 is

always less than the input dc voltage.


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Fig. 1(a) Class A Chopper Circuit

Fig. 1(b): Voltage and Current Directions

The variations in on and off periods of the switch provides an output voltage with an

adjustable average value.

Fig 1(c): Voltage Waveforms

Average voltage, V = (T / (T +T))* V= (T /T)* V=V (1)T = on-timeT = off-time

T = T + T= chopping periodThus the voltage can be controlled by varying duty cycle.

V = f*T *V (2)f = 1/T = chopping frequency

III. MODELLING OF SEPARATELY EXCITED DC MOTORA separately excited dc motor is very versatile as a variable speed motor. Its speed can be

varied by varying the applied voltage to the armature or field current. The speed control using thevariation of armature voltage can be used for constant torque application in the speed range from

zero to rated speed (base speed). Speeds above base speed are obtained by means of fieldweakening, the armature voltage being kept at the rated value. The speed control in this case is at

constant power. In both cases the speed control is smooth and step-less


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International Journal of Elect

6545(Print), ISSN 0976 6553(O

Fig 2

Fig 2(b): Co

A. OPERATION OF SEPARATWhen a separately excite

current of ia flows in the circuit, th

torque at a particular speed. Thewinding is supplied separately. A

current. In general ia is much less t

B.FIELD AND ARMATURE E

Instantaneous field current:

difVf= Rfif+ Lf dtWhere, Rf and Lf are the field resisInstantaneous armature current:

diaVa = Raia+La + EgdtWhere, Ra and La are the arm

The motor back emf, which is also

Eg = KvifKv is the motor voltage constant

ical Engineering and Technology (IJEET),

line) Volume 4, Issue 2, March April (2013),

232

(a): Separately Excited DC motor

plete layout for DC motor speed control

ELY EXCITED DC MOTOR

dc motor is excited by a field current of if ane motor develops a back EMF and a torque to ba

ield current if is independent of the armature cuny change in the armature current has no effecan if.

QUATIONS

(3)

tor and inductor, respectively.

(4)

ture resistor and inductance respectively.

known as speed voltage, is expressed as:

(5)

(in V/A-rad/sec and is the motor speed (in ra

SSN 0976

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d an armaturelance the load

rrent ia.. Eacht on the field

/sec).


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C.BASIC TORQUE EQUATIO

The torque developed by the motor i

Td = Kt ifiawhere, (Kt=Kv) is the torque consta

For normal operation, the developedinertia, i.e.

dTd = J + B + TLdtWhere, B: viscous friction constant,

: load torque (N.m)

J: inertia of the motor (kg.m

D. STEADY-STATE TORQUEThe motor speed can be easily deri

= (Va - IaRa)/KvIfIf Ra is a small value (which is usu

= Va /KvIfThat is if the field current is kept cThe developed torque is:

Td = KtIfIa= B+ TLThe required power is:

Pd= TdE. TORQUE AND SPEED CON

An important fact can be

current, or flux (If) the torque demotor speed can be controlled by c

F. VARIABLE SPEED OPERA

Fig. 3(a): Torque Vs



233

s:

(6)

t.(in V/A-rad/s)

torque must be equal to the load torque plus the fric

(7)

(N.m/rad/s)

2)

ND SPEED

ed:

(8)

al), or when the motor is lightly loaded, i.e. Ia is sm

(9)

nstant, the motor speed depends only on the supply

(10)

(11)

ROL

educed for steady-state operation of DC motor. F

mand can be satisfied by varying the armature

ntrolling Va (voltage control) or controlling Vf(fieldION

peed Characteristic for Different Armature Voltage

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tion and

all,

voltage.

r a fixed field

current Ia. Thecontrol).

s


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Family of steady state torque speed curves for a range of armature voltage can be drawn as above. Thespeed of DC motor can simply be set by applying the correct voltage. The speed variation from no

load to full load (rated) can be quite small. It depends on the armature resistance.

G. BASE SPEED AND FIELD-WEAKENING

Fig. 3(b): Torque Vs Speed and Power Vs Speed Characteristic of Separately Excited DC Motor

The motor speed can be varied by-

(a) Controlling the armature voltage V, known as voltage control;(b) Controlling the field current I, known as field control; and(c) Torque demand, which corresponds to an armature current I, for a fixed field current I.The speed corresponds to the rated armature voltage, rated field current and rated armature currentwhich is known as the rated (or base) speed. In practice, for a speed less than the base speed, the

armature current and field currents are maintained constant to meet the torque demand, and the

armature voltage V is varied to control the speed. For speed higher than the base speed, the armaturevoltage is maintained at the rated value and the field current is varied to control the speed. However,

the power developed by the motor (power = torque * speed) remains constant.Base speed (W)-The speed which correspond to the rated V , rated I and rated I .Constant torque region (W< W)-Ia and If are maintained constant to met torque demand. V is varied to control the speed as powerincreases with speed.

Constant power region (W> W)-V is maintained at the rated value and If is reduced to increase speed. However the powerdeveloped by the motor (= torque x speed) remains constant. This phenomenon is known as Fieldweakening.

Fig 3(c): Typical Operating Regions of Separately Excited DC Machines


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IV. DESIGN OF CONTROL

Three types of controllers wer

involves the design of three type1. Conventional PI Controll

2. Fuzzy Controller

3. ANFIS Controller

A. DESIGN OF PI CONTR

1.DESIGN CURRENT CON

Fig4: Block

KtKp(1+Tis)*( RaIa Tis(1+sTa)=

Iaref KtKp(1+Tis)*(Ra)Tis(1+sTa)Here, (Current Controller Parsuch that it cancels the largest ti

of the system in 7.2.and, the res

Ti=Ta

Now, putting the value in equati

Ia KtKp/RasTa=Iaref K1KtKp/RaTas(1+T1s)

KtKp

Let Ko =RaTa



235

ER

used and the result was analyzed. Design

s of controllerer

LLER

TROLLER

diagram for design of Current Controller

)(12)

K11+T1s

meter) can be varied as when required. shome constant in the transfer function in order to

onse will be much faster. Assuming

n (12) we have

(13)

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of Controller

ld be chosenreduce order


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236

So,

= I=/

( )

I= ( ) (14)Therefore, the characteristic equation of the above equation is given as

sT + s + KK =0s +

+

=0

s + 2 + =0; ==1/(2T )=

For a second order system value of =0.707 to have a proper response.

0.707=

KK =1/2T

= (15)

K = (16)From Eq.14 we have

I= ( )

)

=( )/

(17)

The zero in the above equation may result in an overshoot. Therefore, we will use a time lag

filter to cancel its effect. The current loop time constant is much higher than filter time

constant. For a small delay we can write

(1 + Ts)I =

(18)

I= (19)Neglecting s term we have

I=

(20)

This equation is used as a response for the speed controller.


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2. DESIGN OF SPEED CONTROLLER

Fig5: Block diagram for design of Speed Controller

(s)/(s)(ref)=(Kn/K2)(Ra/KmTmTn)(1+TnS/(1+2T2S)S )/1+(KnRa/K2KmTmTn)(1+TnS/(1+2T2S)S)(K1/(1+T1S)) (21)Here, we have the option to Tn such that it cancels the largest time constant of the transfer function

So, Tn=2T2Hence, equation 21 will be written as:

(s)/(s)(ref. ) = (KnRa/K2KmTmTn)(1 + T1S)/K2KmTnS2(1 + T1S) + KnRaK1 (22)Ideally, (s) =1/S (S+s+)

The damping constant is zero in above transfer function because of absence of S term, which results inoscillatory and unstable system. To optimize this we must get transfer function whose gain is close tounity

Then using Modulus og Hugging method and deducing the above equation we finally get

( )( )/ ( )( ) = 1/( 1 + 4 1 + 8 2 1 + 8 3 1) (23)3. DESIGN OF FUZZY CONTROLLER

The fuzzy controller used in this scheme is a Speed Controller. The Conventional Speed PI

Controller is replaced by a Fuzzy Logic Based speed Controller for providing more reliable controlleroutputs for the Speed control of The Induction Motor. The main objective of the fuzzy controller is that

the actual speed response of the induction motor must track the reference speed response The design ofa Fuzzy logic system includes the design of a rule base, the design of the member-ship functions

determination of the Linguistic values. Here, the inputs of fuzzy controllers are the error in speed andthe rate of change of this error at any time interval. The output of the fuzzy controller is the ActivePower. Here, five fuzzy sets (NB, N, Z, P, and PB) are adopted for each input and output variables.

The Character NB, N Z, P, PB represents Negative big, Negative, Zero, Positive, Positive Big. The

membership functions of the two input variables and the one output variable has normalized universeof discourse over the interval [- 1, 1].For the implementation of FLC, firstly, the universe of discourse

of input and output variables of FLC are determined. In practice, each universe is restricted to an

interval that is related to the maximal and minimal possible values of the respective variables. That isto the operating range of the variable. The universe of discourse of the input and output variables of the

Mamdani type (PI like) FLC can be determined as-

The universe of the error is defined by the maximal and minimal values of the variables. It {emin,emax] is the interval where:

= =


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Analogously the change in error and the change of the output have operating ranges between

[ , ] and [ , ].Where,

`

=

= = = The operating ranges are defined with respect to the external values of the relevant variables. They

can be further adjusted by taking into account the dynamics of the controlled systems and the

sampling intervals.For simplification and unification of the design of the FLC and its computer implementation,

however it is more convenient to operate with normalizes universe of discourse of the input andoutput variables of the FLC. The normalized universes are well defined domains; the fuzzy values

of input and output variables are fuzzy subsets of these domains. In general, the normalized

universes can be identical to the real operating ranges of the variables, but in most applications

they coincide with the closed interval [-1 1].Otherwise ,scaling of both input and output variablesare done in order to bring the values within prescribed limit.The Rule Table is formulated based on which the Fuzzy Controller is designed.

Table:1 Rule base for speed controller

4. DESIGN OF ANFIS CONTROLLERSteps Involved in the making of the ANFIS Controller

Step1: Get the Error and Change in Error values from the previous model and save it in workspaceand finally define these values in a matrix in the M-file of Matlab.

Step2: Run the matrix file.

Step3: Open the ANFIS editor.Step4: Load data from workspace in the ANFIS editor.

Step5:Generate FIS using Grid Partition. Here, the number of Member Functions and type of

Member Functions are taken.Step6: Train the data using training FIS. Here the Error tolerance and epochs are also given.

Step7: The data is trained using Train FIS.Step8: Step2 to 7 are performed using Checking Data.

Step9: The file is saved in both workspace and matlab-file by exporting it.Step10: The Simulink model for ANFIS is opened and the controller is named after the name of

the file saved in Step9.

The ANFIS Speed Controller is obtained using the above steps.


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V. SIMULATION RESULTS AND DISCUSSIONSThe graph responses of the Fuzzy and ANFIS controllers has been compared with the.

conventional PI controller. With the implementation of AI techniques (Fuzzy & ANFIS), theresponse shows that there is much flexibly with the variation of load found as compared to

conventional model. In all the responses it has been found that the actual speed of the DC

motor is as par with the reference speed of the motor. With Conventional PI speed controller

the actual speed of the motor is tracking the reference speed of the motor up to the rated

speed and even beyond it. But with Fuzzy & ANFIS Controller the actual speed of the motor

is tracking the reference speed of the motor upto the rated speed and when the motor is

overloaded the responses falls and error goes on increasing concluding that the motors fails to

start or the motor stops. Thus the AI technique based controllers provides much better and

precise control of the DC motor.

FIG 6:-Block Representation of Motor Model with Fuzzy & PI Controller

Fig 7:-Block Representation of Motor Model with ANFIS & PI Controller


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Appendix

Table:2

I. Performance of DC motor using PI speed ControllerIt is observed from the responses that the actual speed of the DC motor tracks the reference

speed of the motor up to the rated speed of the motor (55rpm). Beyond the rated speed the PIcontroller has limitations in controlling the speed of the dc motor.

Fig 8:Speed Responses of a Separately Excited dc Motor with Step Source as Input Using PIController

Fig 9: Speed Responses of a Separately Excited dc Motor with Ramp Source as Input Using

PI Controller

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5-20

0

20

40

60

Reference Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5-20

0

20

40

60

Actual Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5-20

0

20

40

60

Error Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Reference Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Actual Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5-0.5

0

0.5

1

Error Speed

TimeinSec

S

peed

in

rpm


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II.Performance of DC motor using Fuzzy speed ControllerA. With motor running up to rated speed

Fig 9: Speed Responses of a Separately Excited dc Motor with Step Source as Input with

Rated Load Using Fuzzy Controller

Fig10: Speed Responses of a Separately Excited dc Motor with Ramp Source as Input with

Rated Load Using Fuzzy Controller

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Reference Speed

TimeinSec

S

p

e

e

d

in

rp

m

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Actual Speed

TimeinSec

S

p

e

e

d

in

rp

m

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

ErrorSpeed

TimeinSec

S

p

e

e

d

in

rp

m

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Reference Speed

Time inSec

S

p

e

e

d

in

rp

m

0 0.5 1 1. 5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

ActualSpeed

TimeinSec

S

p

e

e

d

in

rp

m

0 0.5 1 1. 5 2 2.5 3 3.5 4 4.5 5-0.5

0

0.5

1

Error Speed

Time inSec

S

p

e

e

d

in

rp

m


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242

B.With motor running at overloaded condition


Over Loading Condition Using Fuzzy Controller

Fig 12: Speed Responses of a Separately Excited dc Motor with Ramp Source as Input with

Over Loading Condition

III. Performance of DC motor using ANFIS based speed ControllerA. With motor running up to rated speed


Rated Load Using ANFIS Controller

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Reference Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

-400

-200

0

Actual Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

100

200

300

400

500

Error Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

50

100

Reference Speed

TimeinSec

Speed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5-400

-200

0

Actual Speed

TimeinSec

Speed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

100

200

300

Error Speed

TimeinSec

Speed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

TimeinSec

Speed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

TimeinSec

Speed

inr

pm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

TimeinSec

Speed

inr

pm

Actual Speed

Error Speed

Reference Speed


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Rated Load Using ANFIS Controller

B.With motor running at overloaded condition


Over Loading Condition Using ANFIS Controller


Over Loading Condition Using ANFIS Controller .

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Reference Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Actual Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Error Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Reference Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5-60

-40

-20

0

Actual Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50

50

100

Error Speed

TimeinSec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

0

20

40

60

Reference Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5-200

-100

0

Actual Speed

Timein Sec

S

peed

in

rpm

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

0

100

200

ErrorSpeed

Timein Sec

S

peed

in

rpm


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VI.CONCLUSIONIn this paper the speed of a dc motor has been done using three different types of

Controllers viz Speed PI controller, Fuzzy logic based controller and ANFIS based controller.The responses of the motor with three different types of controllers are simulated and studied

and compared with step and ramp responses. With varying load responses it is observed that

the AI technique based controllers gives a flexible and precise control of speed both on

normal loaded and overloaded condition as compared to the conventional PI controller.

REFERENCES

[1].Waleed I. Hameed1 and Khearia A. Mohamad2 Speed control of separately excited dc

motor using fuzzy neural model reference controller International Journal of Instrumentation

and Control Systems (IJICS) Vol.2, No.4, October 2012 PP 27-39.

[2] Dr.P.S Bimbhra Power Electronics,Khanna Publishers.

[3]Ronald R Yager, Dimitar P Filev, Essentials of Fuzzy Modeling and Control WileyInterscience Publications.

[4]Jun Yan, Michael Ryan, James Power Using Fuzzy

Logic towards Intelligent systems

[5]Singari.v.s.r Pavankumar, Sande.krishnaveni, Y.B.Venugopal, Y.S.Kishore Babu, A

Neuro- Fuzzy Based Speed Control of Separately Excited DC Motor, IEEE Transactions on

Computational Intelligence and Communication Networks, pp. 93-98, 2010.

[6] Basma A. Omar, Amira Y. Haikal, Fayz F. Areed, An Adaptive Neuro-Fuzzy Speed

Controller for a Separately excited DC Motor, International Journal of Computer

Applications, pp. 29-37, Vol. 39 No.9, February 2012.

[7] Vandana Jha, Dr. Pankaj Rai and Dibya Bharti, Modelling and Analysis of Dc-Dc

Converter Using Simulink for Dc Motor Control, International Journal of Electrical

Engineering & Technology (IJEET), Volume 3, Issue 2, 2012, pp. 58 - 68, ISSN Print : 0976-6545, ISSN Online: 0976-6553.

[8] M.Gowrisankar and Dr. A. Nirmalkumar, Implementation & Simulation of Fuzzy Logic

Controllers for the Speed Control of Induction Motor and Performance Evaluation of Certain

Membership Functions, International Journal of Electrical Engineering & Technology

(IJEET), Volume 2, Issue 1, 2011, pp. 25 - 35, ISSN Print : 0976-6545, ISSN Online: 0976-

6553.

BIBLIOGRAPHY

Debirupa Hore was born in Guwahati Assam India on April 19th

1983.She

received her B.E Degree in Electrical Engineering from Assam EngineeringCollege Guwahati in 2006 and M.Tech in Energy and Power Systems in 2010

from NIT Silchar. She worked in GIMT Guwahati for 5 years as Assistant

Professor. Currently she is working as an Assistant Professor in Electrical

Engineering Department in KJ Educational Institutes, KJCOEMR, Pune

(Maharashtra).Her research areas of interest includes Power Systems, AI

Techniques, Power Electronics and Drives etc.

a comparative analysis of speed control of separately excited dc motors by conventional-2

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