ANALYTICAL ANALYSIS OF ROTOR SLOT HARMONICS IN THE LINE CURRENT OF SQUIRREL CAGE INDUCTION MOTORS

Mohamed Yazid Kaikaa - Fatima Babaa Abdelmalek Khezzar - Mohamed Boucherma

   This paper describes a new approach for analysing the effect of the space distribution of rotor bars in squirrel cage induction machines on the generation of rotor slot harmonics (RSH). An analytical expression of the stator current has been developed. The proposed expression is based on the linkage inductance expression derived using the winding function approach (WFA) and its decomposition into Fourier series. This approach describes the necessary relationship required for the presence of rotor slot harmonics and explains how the stator current is influenced by voltage unbalance. Simulations results have shown excellent match with theoretically predicted harmonic components.

Keywords: induction motor, rotor slot harmonics, voltage unbalance, Fourier series, diagnostics

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