Third File

NAME: AUNG MIN THANT S/N: 11314693

IV.1 No-load Tests

A. DC Series Motor

Speed: n(rev/min) Current: I(A)

Voltage: V(V)

1478 2.61 17.6

1328 2.57 16

1240 2.52 14.8

1040 2.45 12.8

820 2.25 10.5

528 2.07 7.4

280 1.75 4.7

0

2

4

6

8

10

12

14

16

18

20

0 500 1000 1500 2000

Vo

lt(V

)

Speed (rev/min)

DC Series Motor: Voltage vs Speed

DC series motor

0

0.5

1

1.5

2

2.5

3

0 500 1000 1500 2000

Cu

rren

t(I)

Speed (rev/min)

DC Series Motor: Current vs Speed

DC Series Motor


B. AC Series Motor

Speed: n(rev/min)

Current: I(A)

Voltage: V(V)

1336 3.9 40.3

980 3.6 36.4

658 3.3 32.4

540 3.2 30.4

272 2.5 25

200 2.28 17.79

0

5

10

15

20

25

30

35

40

45

0 500 1000 1500

Vo

lt(V

)

Speed (rev/min)

AC series motor:Voltage vs Speed

AC series motor

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0 500 1000 1500

Cu

rren

t(I)

Speed (rev/min)

AC series motor:Current vs Speed

AC series motor


C. DC separately excited motor

Speed: n(rev/min)

Current: I(A)

Voltage: V(V)

1428 2.11 17.3

1250 2 15.1

816 1.67 10

468 1.35 5.6

273 1.12 3.5

0

2

4

6

8

10

12

14

16

18

20

0 500 1000 1500

Vo

lt(V

)

Speed(rev/min)

DC separately excited motor: Voltage Vs Speed

DC separately excitedmotor

0

0.5

1

1.5

2

2.5

0 500 1000 1500

Cu

rren

t(I)

Speed(rev/min)

DC separately excited motor:Current vs Speed

DC separately excitedmotor


IV.2 Load Test (For separately excited DC motor only)

A. Separately excited DC motor (1A)

Speed: n(rev/min)

Field current:If(A)

Armature current: Ia(A)

Torque: Te(Nm)

Armature voltage:V(V)

Load Voltage: Vac(V)

Load Current:Iac(A)

Power Armature

(W)

Power Load(W)

500 1 10 4.89 9.6 8 1.07 96 8.56

575 1 10 5.38 10.5 8.8 1.12 105 9.856

623 1 10 5.38 11.1 9.1 1.18 111 10.738

710 1 10 5.38 12.1 9.6 1.24 121 11.904

825 1 10 5.38 13.4 10 1.3 134 13

910 1 10 5.38 14.4 10 1.3 144 13

0

20

40

60

80

100

120

140

160

0 200 400 600 800 1000

Speed(rev/min)

Load Test separately excited DC motor (1A)

Torque

Power Armature

Power Load


B. Separately excited DC motor (0.5A)

Speed: n(rev/min)

Field current:If(A)

Armature current:

Ia(A)

Torque: Te(Nm)



Load Current:Iac(A)

Power Armature

(W)

Power Load(W)

868 1 10 5.38 13.83 10 1.32 138.3 13.2

793 0.9 10 5.38 13.32 10 1.31 133.2 13.1

700 0.8 10 4.9 11.45 8 1.3 114.5 10.4

793 0.69 10 4.43 11.72 8 1.1 117.2 8.8

730 0.5 10 2.92 11.69 7.6 1 116.9 7.6

0

20

40

60

80

100

120

140

160

0 100 200 300 400 500 600 700 800 900 1000

Speed (rev/min)

Load Test separately excited DC motor (0.5A)

Torque

Power Armature

Power Load


IV.3 Resistance Test

A. Armature circuit resistance

Rotor Position Volt(V) Current (A)

Resistance Ra(Ω)

1 1.88 5.43 0.346224678

1 1.51 4.35 0.347126437

1 1.09 3.2 0.340625

1 0.54 1.56 0.346153846

1 3.45 10 0.345

2 2.01 5.6 0.358928571

2 1.8 5.2 0.346153846

2 1.02 2.98 0.342281879

2 0.2 0.59 0.338983051

2 3.42 10 0.342

3 1.89 5.2 0.363461538

3 1.59 4.8 0.33125

3 1.08 3.03 0.356435644

3 0.57 1.5 0.38

3 3.41 10 0.341

Average 0.348374966

0

2

4

6

8

10

12

0 0.5 1 1.5 2 2.5 3 3.5

Rotor position

Armature Circuit Resistance

Volt

Current

Resistance

Linear (Resistance)


B. Shunt field winding resistance

Volt(V) Current(A) Resistance(Ω)

4.98 0.5 9.96

9.87 0.6 16.45

14.9 0.7 21.2857143

19.9 0.8 24.875

22.2 0.9 24.6666667

24.8 1 24.8

Average 20.3395635

C. Series field winding resistance

Volt(V) Current(A) Resistance(Ω)

2.53 7.39 0.34235453

2.17 6.27 0.3460925

1.79 5.41 0.33086876

0.96 2.79 0.34408602

0.53 1.51 0.35099338

3.52 10 0.352

Average 0.3443992

y = 40.311x - 14.125

0

5

10

15

20

25

30

0 0.5 1 1.5

Vo

lt(V

)

Current(I)

Shunt field winding resistance

I Vs Volt

Linear (I Vs Volt)


C. Series field winding resistance

Series field resistance (Rf) = approximately 0.35Ω

Appendix 3

V. Lab Report

2. Explanation of the results of experiments and discussion of the different types of behaviour

Connection of the motor to AC series produces accuracy more than in DC. AC series motor Voltage

and Current are risen up obviously. Having this experience could say that AC series motor is more

desirable than DC type due to higher power production at the output.

The load test shows that a field current and an armature current can obtain increasing speed. It can

be seen that torque remains stable which could be due to the load present.

y = 0.3505x - 0.0327

0

0.5

1

1.5

2

2.5

3

3.5

4

0 5 10 15

Vo

lt(V

)

Current(I)

Series Field Winding Resistance

Current Vs Volt

Linear (Current Vs Volt)


Appendix 3

V. Lab Report

3. Ea= Va- (Ia*(Ra+Rf))


Voltage: V(V) Ra Rf Ea

1478 2.61 17.6 0.348 0.344 15.79388

1328 2.57 16 0.348 0.344 14.22156

1240 2.52 14.8 0.348 0.344 13.05616

1040 2.45 12.8 0.348 0.344 11.1046

820 2.25 10.5 0.348 0.344 8.943

528 2.07 7.4 0.348 0.344 5.96756

280 1.75 4.7 0.348 0.344 3.489

y = 0.0102x + 0.5719

0

2

4

6

8

10

12

14

16

18

0 500 1000 1500 2000

Emf

(Ea)

Speed (rev/min)

back emf Dc series motor

back emf Dc seriesmotor



Voltage: V(V) Ra Rf Ea wr Kf

1478 2.61 17.6 0.348 0.344 15.79388 154.6973 0.041341

1328 2.57 16 0.348 0.344 14.22156 138.9973 0.042286

1240 2.52 14.8 0.348 0.344 13.05616 129.7867 0.04257

1040 2.45 12.8 0.348 0.344 11.1046 108.8533 0.044799

820 2.25 10.5 0.348 0.344 8.943 85.82667 0.050318

528 2.07 7.4 0.348 0.344 5.96756 55.264 0.05839

280 1.75 4.7 0.348 0.344 3.489 29.30667 0.079767

Average 0.051353

DC series motor


5.

Speed: n(rev/min)

Field current:If(A)

Armature current:

Ia(A)

Torque: Te(Nm)



Load Current:Iac(A)

Power Armature

(W)

Power Load(W)

Ea

500 1 10 4.89 9.6 8 1.07 96 8.56 25.591

575 1 10 5.38 10.5 8.8 1.12 105 9.856 32.37863

623 1 10 5.38 11.1 9.1 1.18 111 10.738 35.08155

710 1 10 5.38 12.1 9.6 1.24 121 11.904 39.98057

825 1 10 5.38 13.4 10 1.3 134 13 46.4563

910 1 10 5.38 14.4 10 1.3 144 13 51.24271

6.

Torque:

Te(Nm)

Armature voltage:V(

V)

Load Voltag

e: Vac(V)

Load Current:Iac(

A)

Power Armatur

e (W)

Power Load(

W) Ea wr

Efficiency

4.89 9.6 8 1.07 96 8.56 25.591 52.3333

3 0.08916

7

5.38 10.5 8.8 1.12 105 9.856 32.3786

3 60.1833

3 0.09386

7

5.38 11.1 9.1 1.18 111 10.738 35.0815

5 65.2073

3 0.09673

9

5.38 12.1 9.6 1.24 121 11.904 39.9805

7 74.3133

3 0.09838

5.38 13.4 10 1.3 134 13 46.4563 86.35 0.09701

5

5.38 14.4 10 1.3 144 13 51.2427

1 95.2466

7 0.09027

8

0

10

20

30

40

50

60

0 200 400 600 800 1000

EMF

(Ea)

Speed (rev/min)

EMF versus field excitation current(1A)

EMF versus fieldexcitation current


7. Experimental Results Vs Theoretical Calculation

Experimental results has many factors such as human errors, equipment faults, temperature

changes which cause all practical results slightly different from theoretical calculation.

Theory has a lot of formulas which can be plugged by numbers. I n reality, theoretical

calculation can’t be accurate at all time.

4.8

4.9

5

5.1

5.2

5.3

5.4

5.5

0.085 0.09 0.095 0.1

Torq

ue

(Nm

)

Efficiency

Load Test Efficiency Vs Torque current(1A)

Load Test Efficiency VsTorque

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