International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Faults Analysis and Reliability Improvement of Pot Motor Milankumar Manavar1, Piyush Bhupta2, Ismail Pota3, Parshottam Keshvala4 1.2B.E.
Students of Electrical dept., Dr. Subhash Technical Campus, Junagadh, Gujarat, India Professor, Electrical Dept., Dr. Subhash Technical Campus, Junagadh, Gujarat, India 4Sr. Engineer, Pot motor Dept., Indian Rayon, Veraval, Gujarat, India ---------------------------------------------------------------------***--------------------------------------------------------------------3Assistant
Abstract - This paper describes the faults analysis and
reliability improvement of pot motor. The pot motor is continuous running 24 hours in spinning machine to give high speed application for process of rayon production. The pot motor is placed under the most severe chemical conditions, exposed directly to splash of Glauber’s salt (Na2SO4.10H2O) and sulphuric acid and others unknown factor affecting on pot motor. There is special design generator is used for power supply of pot motor. And pot motor should run for 24 hours its most important condition. By using capacitor bank, ceramic bearing, copper bar of rotor, change in diameter of stator winding, visual inspection by skilled person, etc. By applying all we get reliability improvement of pot motor.
Figure No. 1: Pot motor 2. DESIGN OF POT MOTOR According to design of pot motor is very special purpose. The pot motor is made in Japan. It is use since 1970. It means it is very old design of Japan. The design of pot motor is included in this table number 1 as follow,
Key Words: Pot motor, faults analysis, power factor improvement, copper bar of rotor, ceramic bearing, testing and measurement, reliability etc.
1. INTRODUCTION Sr. No. 1 2 3 4 5 6 7 8
The main objective of this study is to redesign a reliable scheme for pot motor. The pot motor is one of the parts of squirrel cage induction motor and the concept is same as squirrel cage induction motor. The cake of yarn is rotating in pot and this pot is mounted on the pot holder or shaft of pot motor. In the spinning machine there is required high speed rotating machine. So here by using special design of pot motor with high frequency and low voltage is used for supplying a power.
Table No. 1: Design of pot motor
The pot motor is vertical axis motor which is placed under the spinning machine. The pot motor should run for 24 hours without any stop. In Indian Rayon there is near about 15000 nos. of pot motor is used for process of rayon production. So that it’s necessary to understand its construction, types of faults, environment, how to improve the reliability of pot motor and other affecting factors.
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Impact Factor value: 5.181
Design of pot motor Details Remarks Power 275 W Voltage 150 V Frequency 150 Hz Stator slots 18 RPM 9000 Rotor slots 22 Air-gap 0.30 mm rad. SWG 22
According to table no. 1 the stator winding of pot motor is double layer type and in this lap winding is used. The conductor is dual coated with supper enameled type is used in the pot motor. The insulation class of this winding is F class-155 c. The frame accommodating the electrical unit is made of special cast iron, having an extremely smooth surface which is specially coated which almost care f or excellent resistivity to acid, alkali, shock and impact. This special coating is incorporated into the unit shape of the
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