## Determination of torque in three phase induction motor when unbalanced impedances are put in the stator phases |

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### Contents

Equivalent circuit of a Polyphase Induction | 8 |

Application of Equivalent circuit to | 13 |

Discussion | 32 |

### Common terms and phrases

a.c. resistance actual voltage Amperes aZBb balanced blocked rotor test calculated circuit shown core loss Cornell University current per phase curves determining equations equivalent circuit error H H H introduced load current load test machine constants magnetic field Magnetising method motor at starting motor currents negative sequence current negative sequence network negative sequence quantities negative sequence torque negative sequence voltage neglected Ohmic ohms operating characteristics phase currents Phase Induction Motor polyphase induction motor positive and negative positive sequence current power factor reactance per phase Refer to pages resistance per phase Resistances in phases rotor resistance saturation effects sequence currents flow stalling point stator current stator phases Symmetrical Components torque at rated torque in ft total torque total voltage unbalanced conditions unbalanced operation vector diagram voltage applied zero sequence currents