Power semiconductor drives
Wiley, Nov 19, 1984 - Technology & Engineering - 354 pages
This 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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ThreePhase Induction Motors
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acceleration air-gap approximate armature circuit armature current assumed breakdown torque bridge rectifier calculated chopper circuit in Fig commutated controlled rectifier converter current Ia current-source inverter curve dc source deceleration delay angle determine diode rectifier 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 line current motor speed motor terminal pd neglected obtained output per-phase 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 stator stator current steady-state supply synchronous motor system in Fig three-phase thyristors transfer function variables voltage-source inverter waveform windage losses zero