## Electrical Machines |

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### Contents

Introduction | 1 |

Transformer | 26 |

ThreePhase Transformers | 130 |

Basic Concepts of Rotating Machines | 161 |

DC Generators | 208 |

DC Motors | 275 |

Synchronous Generators | 349 |

Synchronous Motors | 426 |

Polyphase Induction Motors | 482 |

Single Phase Motors and Special Machines | 560 |

Appendix | 616 |

631 | |

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### Common terms and phrases

0.8 power factor air gap alternator angle armature current armature reaction armature resistance auto-transformer brush Calculate characteristic commutator constant copper loss core loss cos0 Cu-loss DC machine DC motor DC shunt motor delta connected eddy current ELECTRICAL MACHINES Equation equivalent circuit excitation field current field resistance field winding frequency full-load full-load current full-load torque given hv side hysteresis impedance induced emf induction motor iron loss lagging power factor line current line voltage load current magnetising maximum efficiency maximum torque no-load number of turns open circuit operation parallel phase voltage phasor diagram power factor lagging power input Q respectively reactance reactive power rotor resistance SC test short circuit shown in Figure shunt field slip ring slots Solution star-connected starter starting torque stator stepper motor supply voltage synchronous motor synchronous reactance synchronous speed terminal voltage three-phase unity power factor voltage drop voltage regulation zero