International Journal of Scientific & Engineering Research, Volume 4, Issue 4, April-2013 1571
ISSN 2229-5518

Improvement of Efficiency and Thermal Withstanding Capacity of Single Phase Induction Motor using organic Nano Filler Mixed Enamel

B.Guruprakash, R.vishnuprakash, E.Muthupandi, R.Balakumar, N.Vanaja, D.Edision selvaraj

Abstract - It has been found that the addition of nanofillers to the enamel can greatly improve the thermal, mechanical and electrical properties of enamel. Al2O3 has been used as nano filler. The micro particles of Al2O3 were converted into nano particles with the help of ball mill. Scanning electron microscope (SEM) has been used to augment the particle size of the nano powder. The nano filler was mixed with enamel by using ultrasonic vibrator. The enamel filled with nano filler was coated on the windings of the single phase induction motor. The performance analysis of the single phase induction motor was carried out by no load test, blocked rotor test and load test. Based on the calculations and result obtained by the above tests, the efficiency of the induction motor coated with enamel filled with nano filler of Al2O3 was increased by 6% when compared to that of induction motor coated with pure enamel. Heat run test was also performed on this motor to determine the total loss of energy dissipated as heat.
Index words – Single Phase Induction motor, Enamel, Coating, Nano Filler, Load Test, Al2O3

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I. INTRODUCTION

N recent days, a great deal of attention has been given to the applications of nano fillers in the field of electrical insulating materials. It has been noted that

the use of nano fillers to the enamel can greatly improve the

thermal, mechanical and electrical properties of it. Single phase Induction motors are widely used in fans, centrifugal pumps, blowers, lifts, washing machines, hair driers, toys and so on. The efficiency of the induction motor depends upon the enamel used. For motors, the enamel was used for three purposes: impregnation, coating and adhesion. The efficiency of the induction motor could be increased by adding the nano fillers with the enamel which was used as coating for the windings of the motor. In this paper, the efficiency of the normal single phase induction motor and Al2O3 nano filler added enamel coated with the single phase induction motor was analyzed and the results were compared with each other. Heat run tests were performed on electric machines to determine the total loss of energy dissipated as heat. It was a well-known fact that the operating temperature of an electric machine has a very strong relationship with the life duration of the insulation. The enamel used for coating the machine windings were organic in nature and were adversely affected by thermal

decomposition.

phase induction motor. The specifications of the single phase induction motor were shown below in the table 1.

Table 1 Specifications of the Single phase induction motor

II. COATING OF THE NANO FILLER ADDED ENAMEL TO THE WINDINGS OF THE MOTOR

Five percentage of nano powder of Al2O3 was taken and it was mixed with the enamel by using ultrasonic vibrator. Then this enamel was coated on the windings of the single

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Figure 1 Nanocomposite filled enamel coated induction motor

International Journal of Scientific & Engineering Research, Volume 4, Issue 4, April-2013 1572
ISSN 2229-5518

III. EXPERIMENTAL ANALYSIS

A. PERFORMANCE ANALYSIS OF SINGLE PHASE INDUCTION MOTOR – DIRECT LOADING METHOD

The load test was conducted as per the circuit diagram shown in the figure 2 and the output power,current, efficiency, powerfactor and speed of the induction induction was measured. The maximum efficiency obtained from an ordinary induction motor was 69%. The maximum efficiency obtained from nano coated induction motor was

75%. The efficiency of the induction motor with and

without nanocoating was measured and their readings were shown in the table 2.

Figure 2 circuit diagram for load test on single phase induction motor

Table 2 Measurement of efficiency

Normal IM

Nanocoated IM

current

Efficiency

Current

efficiency

3.9

41.46

4

53.65

4

51.31

4.1

65.15

4.2

67.79

4.2

69.50

4.3

69.22

4.3

72.40

4.4

68.73

4.4

74.49

B. TEMPERATURE TEST

Heat run test was performed on electric machines to determine the total loss of energy dissipated as heat. It was a well-known fact that the operating temperature of an electric machine has a very strong relationship with the life duration of the insulation. Heat run tests were conducted on this motor as per IEC 60851. The temperature of the motor was measured under different conditions and the readings were shown in the table 3.

Table 3 Measurement of temperature

Time

Normal motor

Nano coated

motor

0

30

30

5

44

40

10

48

43

15

50

46

20

53

49

25

55

50

30

57

53

35

58

53

IV. CONCLUSIONS

The following observations were clear as per this study:

1. The efficiency of the induction motor was increased by 6 % by adding nano filler of Al2O3 to the enamel used as the coating for the windings of the single phase induction motor.

2. The addition of nano fillers to the enamel has increased the temperature withstanding capacity of the induction motor. Hence the life time of the motor will be increased.

V. ACKNOWLEDGEMENT

This research project would not have been possible without the support of many people. The authors wishes to express their gratitude to the supervisor who was abundantly helpful and offered invaluable assistance, support and guidance. The author would also like to convey thanks to the institute Mepco schlenk engineering college and Faculty for providing the laboratory facilities.

VI. REFERENCE

[1] Selvaraj, D. Edison. "Characterization of dielectric properties of the enamel filled with carbon Nanotubes for the frequency range of 50 Hz-5 MHz." International Journal of Science and Engineering Applications 1.2 (2012): 102-106.
[2] Selvaraj, D. Edison, and C. Pugazhendhi Sugumaran. "Comparative Analysis of Dielectric Properties of Enamel Filled with Various Nanofillers such as ZrO2, Al2O3, CNT and ZnO." International Journal of Science and Engineering

Applications 1.1 (2012): 51-55.

[3] Selvaraj, D. Edison. "Partial discharge characteristics of enamel filled with micro and nano composite of SiO2 and TiO2." International Journal of Science and Engineering Applications 1.2 (2012): 95-101.
[4] D.Edisonselvaraj,B.Guruprakash,R.Vishnuprakash,R.Balaku mar"Analysis of Efficiency, Thermal Withstanding Capacity and Electromagnetic Interference of Three Phase Squirrel
Cage Induction Motor Coated with SiO2 & TiO2

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International Journal of Scientific & Engineering Research, Volume 4, Issue 4, April-2013 1573
ISSN 2229-5518
NanoCompositeFilledEnamel."International Journal of Science and Engineering Applications 1.1 (2012): 17-21.
[5] Edison Selvaraj, D., C. Pugazhendhi Sugumaran, and A.
SivaPrakash. "Characterization of Electrical and Thermal Properties of Enamel Filled with Carbon Nanotubes." Proceedings of the Third International Conference on Trends in Information, Telecommunication and Computing. Springer New York.

[6] Barbara goricka ,Barbara czoeowska,Boleseaw mazurek,Jadwiga zawadzka,Lech gorecki “Varnishes modified with nanoparticles for use in electrical insulation” Electrotechnical Institute, Division of Electro technology and Materials Science M.Sklodowskiej-Curie 55/61, 50-369

Wroclaw, Poland

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