## Worked examples in electrical machines and drives |

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### Contents

INTRODUCTION AND REVIEW OF BASIC | 1 |

TRANSFORMERS Example Nos | 24 |

D C MACHINES | 38 |

Copyright | |

7 other sections not shown

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### Common terms and phrases

3-phase air-gap ampere approximate circuit Calculate characteristic components condition constant copper loss d.c. machine d.c. series motor drives duty cycle dynamic braking electrical electromagnetic torque equation equivalent circuit equivalent-circuit excitation expression field current field resistance ft per phase full-load torque give harmonic Hence increase induction machine induction motor inertia input kg m2 load angle load torque magnetisation curve maximum torque mechanical load motoring convention neglected Nm/A normal open-circuit operating output p.f. lagging parameters per-unit phasor diagram power factor power-electronic primary rad/s rated current rated flux rated torque rated value rated voltage ratio reactance reduced referred regeneratively braking resistor rev/min reverse rotation rotor current saturation secondary Short-circuit single-phase slip solution speed/torque curves starting torque stator synchronous impedance synchronous machine synchronous motor synchronous speed terminal voltage thyristor transfer function transformer unit voltage and frequency waveform winding