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access icon free Broken rotor bar fault detection of the grid and inverter-fed induction motor by effective attenuation of the fundamental component

© The Institution of Engineering and Technology
Received 15/05/2019, Accepted 17/07/2019, Revised 07/07/2019, Published 18/07/2019

Since electrical machines are the largest consumer of electricity worldwide, their fault diagnostic at the incipient stage and condition monitoring is essential for better reliability, economy, and safety of operation. Out of several condition monitoring techniques, motor current signature analysis is gaining heightened popularity because of its non-invasive nature, the least number of sensors required and versatility of compatible algorithms. In this study, the best characteristics of infinite impulse response (IIR) filter are exploited to observe the broken rotor bar (BRB) frequencies with good legibility in current and voltage spectrum of the grid and inverter-fed motor, respectively. The causes of various harmonics in the stator current spectrum are first investigated for better understanding. The results are taken based on simulation and measurements taken from the laboratory setup. It is observed that a better tuning of IIR filters can make diagnostic algorithms capable of detecting the frequencies of interest by effectively attenuating the fundamental component and reducing its spectral leakage. Moreover, in case of direct torque control-based industrial inverter-fed motors, the current cannot be a good candidate for fault diagnostics rather the phase voltage can be effectively used for the detection of BRBs.

Inspec keywords: stators; fault diagnosis; induction motors; condition monitoring; torque control; invertors; IIR filters; rotors

Other keywords: diagnostic algorithms; infinite impulse response filter; economy; broken rotor bar frequencies; fault diagnostic; IIR filters; fault diagnostics rather the phase voltage; compatible algorithms; electrical machines; fundamental component; largest consumer; inverter-fed induction motor; good legibility; stator current spectrum; inverter-fed motor; noninvasive nature; heightened popularity; condition monitoring techniques; voltage spectrum; motor current signature analysis; electricity worldwide; grid; incipient stage; direct torque control-based industrial inverter-fed motors; broken rotor bar fault detection; effective attenuation

Subjects: Mechanical variables control; Control of electric power systems; Asynchronous machines

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