Diagnosis of Multiple Rotor Bar Faults of Squirrel Cage Induction Motor (SCIM) Using Rational Dilation Wavelet Transforms

Abstract

Vibration is the vital feature of the motor to diagnose various faults. The existing methods have many limitations. This work proposes a non-invasive Software Phase Locked Loop (SPLL) technique to diagnose the multiple rotor faults. A high-frequency (10.525GHz) microwave signal is projected on the motor and the reflected signal is captured by the handheld ultra-wide band (UWB) radar. Hardware filter is replaced by a software phase locked loop filter to remove high-frequency noise content in the signal. The output of the SPLL is analysed with Rational Dilation Wavelet Transforms (RDWT) and compared the change in the signal energy of the wavelet sub-band 6 for the multiple rotor bar faults and sub-bands 6 and 7 for the combination of rotor bar and bearing faults, respectively. The signal energy at sub-band 6 increased from 2.19% without fault to 3.99%, 6.03% and 13.66% with an increase in the number of rotor bars with faults. The variation of the experimental values of the signal energy for rotor bar faults compared with the theoretical values found that the error is reduced and accuracy is increased with the number of faults. For simultaneous rotor bar and bearing faults, the signal energy at sub-bands 6 and 7 also increases. The proposed SPLL-based method that is able to diagnose the individual faults and combination of the faults and has advantages such as simple, cost-effective and non-invasive technique compared with the existing methods.

KEYWORDS:

• Bearing faults
• Handheld UWB radar
• Rational dilation wavelet transforms (RDWT)
• Rotor bar faults
• Software phase locked loop (SPLL)
• Squirrel cage induction motor (SCIM)

Additional information

Notes on contributors

Madhusudhana Reddy Barusu

Madhusudhana Reddy Barusu was born in Andhra Pradesh, India, on July 21, 1985. He received doctoral degree from Anna University, Chennai, India and received Master’s degree from the Satyabhama University, Chennai, India. He has been working as a faculty member in the Department of Electronics and Communication Engineering, Vel Tech High Tech Dr Rangarajan Dr Sakunthala Engineering College since 2011. His areas of interest include VLSI design, power electronics and drives, signal processing. Dr Madhusudhana Reddy Barusu is life time member of the Indian Society for Technical Education (ISTE), the Institution of Electronics and Telecommunication Engineers (IETE).

Meganathan Deivasigamani

Meganathan Deivasigamani was born in Chennai, India on May 28,1974. He received doctoral degree from CEG, Anna University, Chennai, India and graduated from PSG Tech, Coimbatore, India. He has been working as a faculty member in the Department of Electronics Engineering, Anna University since 2003. His areas of interest include VLSI design and power electronics and drives. Dr D Meganathan received post-doctoral fellowship under EURINDIA programme. He had been KTH Royal Institute of Technology, Sweden, for the collabortive research work during 2010-11. He is a member of IETE, IE. etc. Email: [email protected]