## Power semiconductor drivesThis comprehensive guide to the design of electric motor drives and speed and position control systems provides an analysis of the steady-state operation of drive systems that permit the specification of suitable converters and machines for the AC or DC system envisioned. Includes some coverage of transient operation. |

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### Contents

Chopper Drives | 127 |

ThreePhase Induction Motors | 158 |

Speed Control by SlipEnergy Recovery | 199 |

Copyright | |

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acceleration air-gap approximation armature circuit armature current assumed bridge rectifier calculated chopper circuit in Fig commutated controlled rectifier converter current Ia current-source inverter curve dc source deceleration delay angle determine diode diode rectifier discontinuous current drive system energy equation equivalent circuit Example field current field weakening flux frame-size freewheeling friction and windage full-load fundamental component gating signals illustrated in Fig increased induction motor inductor leakage inductance line-to-line load torque loss torque machine motor speed motor terminal pd neglected obtained output per-phase phasor power factor pulse-width modulation quadrant rad/s rated speed rated torque rated value ratio reactance regeneration regenerative braking rms value rotational losses rotor shaft shown in Fig single-phase sinusoidal speed control speed range speed-torque characteristic ßoe stator stator current supply synchronous motor system in Fig three-phase thyristors transfer function variables voltage-source inverter waveform windage losses zero