Analysis of the Squirrel Cage Induction Motor in the Broken Rotor Bar Condition Based on the Calculation of the Rotor Bar Current

Calculating the current of the rotor bars in a squirrel cage induction motor (SCIM) using stator data is difficult, but it is very useful. With the calculation of the rotor bars’ current, analysis and investigation of some different parameters of the motor can be done, precisely. One of the faults faced by SCIM is the broken rotor bar (BRB) fault. The breakage of one or more bars causes a change in the healthy bars' current and the motor's behavior and parameters. This paper introduces the method of calculating the rotor bars’ current in the SCIM in two healthy and defective states (breakage of ۱ bar and ۲ adjacent bars) using the multiple-coupled circuit (MCC) model. In addition to currents, some important parameters, such as speed, magnetic field, etc., will be calculated. For validation of results, a two-pole SCIM with a nominal specification of ۱.۱ kW, ۲۲۰/۳۸۰ V, and ۵۰ Hz is subjected to experimental testing. The results are confirmed by practical tests and simulations using the Ansys Maxwell software.

کلیدواژه ها:

Broken rotor bar fault ، Multiple-coupled circuit ، Rotor bar ، Squirrel cage Induction motor