## Introduction to Electrical Machines |

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### Contents

Chap Page I Electromagnet1sm and Electromagnetic Induct1on | 1 |

The Magnet1c Circu1t and Magnetic Calculations | 18 |

The Electromagnetic Mach1ne | 50 |

Copyright | |

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air-gap ampere ampere-turns amplitude amps armature average value axial B-H curve brush c.g.s. units calculated coefficient coil commutator conductors connexion constant cooling core current wave D.C. machine decreases dielectric dielectric strength direction E.M.F. and current E.M.F. induced E.M.F. wave eddy current eddy current losses effect electric force electrical machines equal equation ergs excitation ferromagnetic flux density frequency friction fundamental fundamental frequency Hence hysteresis loss increases induced E.M.F. induction motor insulation joules laminations leakage flux lines per sq load loop magnetic circuit magnetic field magnetizing current magnetizing force materials maximum value mica number of conductors number of turns ohms path permeability permeance permittivity phase pole pitch portion Power output produced r.m.s. value rate of heat reactance reluctance rotating rotor salient pole self-inductance shown in fig sin0 sin6 sine wave slot speed stator surface temperature rise three-phase transformer turbo-alternator varnish volt-amperes volts watts wave form winding