Title: Identification between broken rotor bars and low-frequency load torque fluctuations in a three-phase induction motor

Authors: Ranjan Sasti Charan Pal; Amiya Ranjan Mohanty

Addresses: Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India ' Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India

Abstract: Motor current signature analysis is an efficient methodology for fault diagnosis of induction motors. The appearance of broken rotor bars creates pole pass frequency (f_PPF). Applied load torque creates low-frequency load torque fluctuations at frequency (f_L), which tends to exist in the vicinity of f_PPF. Hitherto, techniques have been proposed wherein synchronised monitoring of three-phase currents and three-phase voltages are measured by three current and three voltage sensors. This leads to a requirement for a data acquisition (DAQ) unit with at least six channels that make the overall system expensive and cumbersome in the field. However, in the present article, a new fault diagnostic approach has been proposed, which considers current data being monitored only from one single phase and thus requires only one single channel of DAQ that makes the overall system economical and portable for easy field deployment. The proposed analytical study has been verified with experimental results and finite element method.

Keywords: broken rotor bars; BRBs; load torque fluctuations; motor current signature analysis; MCSA; three-phase induction motors.

DOI: 10.1504/IJAAC.2024.137055

International Journal of Automation and Control, 2024 Vol.18 No.2, pp.133 - 160

Received: 01 Jul 2022
Accepted: 25 Feb 2023
Published online: 01 Mar 2024 *

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