Thyristor Control of A.C. Motors |
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Page 5
... switch having zero voltage drop across it and a current which is determined by the external circuit . In the off ... switching times of the thyristor are an order of magnitude lower than those of the thyratron . The reduced turn ...
... switch having zero voltage drop across it and a current which is determined by the external circuit . In the off ... switching times of the thyristor are an order of magnitude lower than those of the thyratron . The reduced turn ...
Page 140
... switching elements for small motors , ( 165-6 ) but thyristors are necessary for larger powers . Conventional d.c. armature windings have been used with solid - state commutators which simulate the progressive switching action of the ...
... switching elements for small motors , ( 165-6 ) but thyristors are necessary for larger powers . Conventional d.c. armature windings have been used with solid - state commutators which simulate the progressive switching action of the ...
Page 147
... switching device consisting of two switching rings which were driven by the motor shaft or by a small independent variable - speed motor . Subsequently , a completely static switching unit was developed . ( 180 ) In a more recent paper ...
... switching device consisting of two switching rings which were driven by the motor shaft or by a small independent variable - speed motor . Subsequently , a completely static switching unit was developed . ( 180 ) In a more recent paper ...
Contents
PRINCIPLES OF VARIABLEFREQUENCY A C DRIVES | 1 |
THE D C LINK CONVERTER | 27 |
THE PHASECONTROLLED CYCLOCONVERTER | 83 |
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a.c. drive a.c. motor a.c. supply air-gap flux amplitude anode applied armature bridge circuit capacitor cent commutating circuit component constant control circuitry copper loss current waveforms cycloconverter d.c. link converter delay angle equation equivalent circuit f₁ firing angle frequency converter full-load fundamental gating pulses half-cycle half-wave harmonic currents I₁ increased induction motor inductive load inductor input inverter circuit load current low-frequency m.m.f. wave machine magnetic 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 six-step speed control static frequency converter static inverter stator current stator voltage supply frequency supply voltage switching synchronous speed three-phase thyratron thyristor torque transformer transient V₁ variable-frequency variable-frequency drive variable-speed drive voltage and current voltage control voltage drop volts/Hz winding zero