Abstract
This paper investigates the effect of the rotor slots (bars) number of a three phase squirrel cage induction motor on the motor performance under broken bar fault condition. Two motors have been investigated at full load condition in healthy bars, one broken bar and two broken bars operations. The first motor has 24 stator slots and is investigated with rotor slots 20, 29 and 32 and the second motor has 36 slots and is investigated with rotor slots 28 and 44. The above-mentioned rotor slots numbers have been selected based on manufacturer's database. The effect of rotor slots numbers on motor performance with broken bars fault has been observed by analyzing the stator current emerging frequency components, steady state copper losses, slip at full load and steady state bar currents. Recommendation for the safest stator and rotor slots combinations has been provided based on simulated key performance indicators.
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