A new method with a simple and reliable structure to fault detection of broken rotor bar of three-phase squirrel cage induction motors

Rajaee, Mahdi; Ebadi, Mahdi; Yousefian, Mahmoud

doi:10.48301/kssa.2025.452740.2886

A new method with a simple and reliable structure to fault detection of broken rotor bar of three-phase squirrel cage induction motors

Document Type : Original Article

Authors

Mahdi Rajaee ¹

Mahdi Ebadi ²

Mahmoud Yousefian ³

¹ Ph.D. Student, Department of Electrical Engineering, Ferdowsi University of Mashhad, Tehran, Iran

² Assistant Professor, Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

³ Assistant Professor, Department of Electrical Engineering, Technical and Vocational University (TVU), Tehran, Iran

10.48301/kssa.2025.452740.2886

Abstract

Current analysis of electric machines in the field of fault detection with features such as reliability, simple structure, ability to implement online, non-invasive, usable in continuous operation of the motor with any torque and application for motors with different power is important. In this research, extracting the current periodic root mean square (CPRMS), which is based on the effectiveness of instantaneous sampling of the current at certain intervals is proposed. in squirrel cage induction motors, it’s necessary to detect the broken rotor bar (BRB), and considering that in this fault, the frequency component (1±2s)fs affects the main signal of the motor current. The amount of slip of high-power motors during operation is very small, which makes the fault detection process difficult. Compared to transient, offline, and invasive methods that require stopping, starting, or installing internal equipment, the CPRMS method performs fracture fault detection in the continuous operating mode of the motor without using internal equipment. In this paper, the proposed method is simulated on four power spectrum' of three-phase squirrel cage induction motors with low, medium, high and very high power, taking into account the parameters of the equivalent circuit, with using of MATLAB programming.

Keywords

Fault detection

Current periodic root mean square (CPRMS)

Three-phase squirrel cage induction motors

Broken rotor bar

Subjects

power engineering

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