Thyristor Control of A.C. Motors |
Contents
PRINCIPLES OF VARIABLEFREQUENCY A C DRIVES | 1 |
I | 17 |
THE D C LINK CONVERTER | 37 |
Copyright | |
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a.c. drive a.c. motor a.c. supply air-gap flux anode applications armature bridge circuit bridge inverter bridge rectifier capacitor commutating circuit component conducting constant control circuitry copper loss current waveforms cycloconverter d.c. link converter delay angle equation equivalent circuit f₁ firing angle full-load fundamental gating pulses half-cycle half-wave harmonic currents I.E.E.E. Trans increased induction motor inductive load inductor input inverter circuit load current low-frequency m.m.f. wave machine magnetic motor drive motor torque negative non-sinusoidal obtained output frequency output voltage waveform per-unit phase voltage phase-controlled power factor pulse-width modulated reactive power reduced reluctance motor reverse rotating rotor current rotor frequency rotor resistance shown in Fig single-phase sinusoidal speed control speed range static inverter stator current stator frequency stator voltage supply frequency supply voltage switching synchronous speed three-phase thyratron thyristor torque transformer transient V₁ variable-frequency variable-frequency drive variable-speed variable-speed drive voltage and current voltage control volts/Hz winding zero