Thyristor Control of A.C. Motors |
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Page 73
... frequency . As the cycloconverter output frequency approaches the supply frequency , the harmonic distortion in the output voltage increases , since the output voltage waveform is composed of fewer segments of the supply voltage . As a ...
... frequency . As the cycloconverter output frequency approaches the supply frequency , the harmonic distortion in the output voltage increases , since the output voltage waveform is composed of fewer segments of the supply voltage . As a ...
Page 115
... supply . A general set of equations which is valid for transient and steady ... supply frequency . They have shown that the ... FREQUENCY OPERATION OF INDUCTION MOTORS 115 Transient Performance of the Frequency-controlled Induction Motor.
... supply . A general set of equations which is valid for transient and steady ... supply frequency . They have shown that the ... FREQUENCY OPERATION OF INDUCTION MOTORS 115 Transient Performance of the Frequency-controlled Induction Motor.
Page 116
... supply frequency lies between 10 and 20 per cent of the rated frequency . The lightly damped oscillations occurring at these reduced frequencies impair the system per- formance at low speeds . Small induction motors may even become ...
... supply frequency lies between 10 and 20 per cent of the rated frequency . The lightly damped oscillations occurring at these reduced frequencies impair the system per- formance at low speeds . Small induction motors may even become ...
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