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A fast calculation method for parametric survey is needed when designing motors. We propose a new method for analyzing the harmonic components of air-gap flux density distribution in three-phase wound rotor induction motors. The proposed method is based on analytical equations for permeance and magnetomotive force distribution, considering the influence of the circumference slot arrangement and winding pattern of the motor. Thus, the harmonic components of the air-gap flux density distribution can be analyzed in a short time. The analysis results of the proposed method are in agreement with those of finite element magnetic analysis in on-load condition. Consequently, this method is shown to be suitable for quantitatively estimating the flux density of wound rotor induction motors and useful for parametric survey when designing wound rotor induction motors.

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