Calculation of The Rotor Bars Current in The Squirrel Cage Induction Motor in The Rotor Eccentricity Condition Using The Multiple Coupled Circuit Model

Shadfar, Hamed; Izadfar, Hamid Reaz

doi:10.22075/jme.2025.38273.2873

Calculation of The Rotor Bars Current in The Squirrel Cage Induction Motor in The Rotor Eccentricity Condition Using The Multiple Coupled Circuit Model

Articles in Press

Document Type : Research Paper

Authors

Hamed Shadfar ¹

Hamid Reaz Izadfar ²

¹ Semnan University

² دانشگاه سمنان

10.22075/jme.2025.38273.2873

Abstract

Rotor eccentricity (RE) is one of the common faults in induction motors (IMs). We will calculate the rotor bar current (RBC) in this condition. This helps to the precision modeling of motors under fault conditions. Besides, the dynamic behavior of the IM under dynamic eccentricity (DE) and static eccentricity (SE) will be analyzed. To monitor the condition of electric machines to prevent unexpected failure, we need accurate modeling of motor behavior and performance in different operating conditions. The multiple coupled circuit (MCC) model is one of the powerful methods for modeling and analyzing electric machines in healthy and faulty conditions, including RE faults, which have been widely used in recent years. This paper calculates the RBC under RE conditions on a 2-pole squirrel cage induction motor (SCIM) with a nominal specification of 1.1 kW, 220/380 V, and 50 Hz, using an MCC model based on the winding function theory (WFT) and the stator data. Also, the behavior of other motor characteristics is evaluated. This paper presents a new method for calculating the RBC of an IM. This method is analytical and can be used to model the IM precisely. The results enable us to calculate and compare the primary parameters of IMs for both healthy and faulty conditions, including losses, efficiency, and torque ripple.

Keywords

Multiple coupled circuit model (MCC)

Rotor bar

Rotor eccentricity (RE)

Squirrel cage induction motor (SCIM)

Winding function theory (WFT)

Subjects