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Nowadays induction machines of enclosed slot rotor structure are widely utilised and are also being applied to ac servo drive for high performance. However, since in this types of machines local magnetic saturation is found at relatively small flux levels due to its rotor structure, the parameters have large discrepancies in their values depending on the identification methods. Moreover, stator current is much more distorted immediately after a stepwise change in the stator voltage. This means that distortion of the flux is enhanced even if stator current is controlled sinusoidally.