Power Electronic Control of AC Motors |
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Page 123
... wave , ve , is compared with a sinusoidal reference wave , v ,, of the desired frequency , and the crossover points are used to determine the inverter switching instants . In Fig . 4.16 , an asymmetrical triangular wave is mixed with a sine ...
... wave , ve , is compared with a sinusoidal reference wave , v ,, of the desired frequency , and the crossover points are used to determine the inverter switching instants . In Fig . 4.16 , an asymmetrical triangular wave is mixed with a sine ...
Page 131
... wave PWM inverter . AC line voltage waveform : ( a ) near base frequency ; ( b ) at half - frequency ; ( c ) at ... sine wave supply , and the inverter output voltage should be as nearly sinusoidal as possible . It seems obvious ...
... wave PWM inverter . AC line voltage waveform : ( a ) near base frequency ; ( b ) at half - frequency ; ( c ) at ... sine wave supply , and the inverter output voltage should be as nearly sinusoidal as possible . It seems obvious ...
Page 135
... sine wave . This means that the pole voltage waveform is now an unmodulated square wave , and the inverter has transitioned from sine wave PWM to the six - step mode of operation , which develops the maximum possible value of ...
... sine wave . This means that the pole voltage waveform is now an unmodulated square wave , and the inverter has transitioned from sine wave PWM to the six - step mode of operation , which develops the maximum possible value of ...
Common terms and phrases
ac supply adjustable-frequency adjustable-speed adjustable-speed drive airgap flux amplitude Appl applications armature brushless dc motor capacitor characteristics component Conf constant copper loss current waveforms cycloconverter dc link voltage device diode drive system electrical Equation fundamental gate gate turn-off thyristors half-cycle harmonic currents IEEE IEEE Ind IEEE Trans increased induction motor induction motor drive inductor input inverter drive junction load current maximum modulation modulation index MOSFET motor current motor operation motor torque n-p-n transistor on-state output voltage per-unit permanent magnet phase current phase-controlled phasor pole voltage positive power factor power semiconductor pulse PWM inverter rated rectifier reduced reluctance motor reverse rotation rotor servo shaft shown in Fig signal sine wave single-phase sinusoidal slip frequency snubber speed control static stator current stator voltage supply frequency supply voltage switching synchronous motor three-phase thyristor tion torque torque angle torque-speed transistor turn-off vector voltage and current voltage waveform volts/hertz winding zero