Power Electronic Control of AC Motors |
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Page 130
... modulated line - to - line voltage is proportional to the modulation index , M , and the periodic time of the reference wave , T. Thus , the pulse duration , T ,, is pro- portional to MT , or M / ƒ , where ƒ is the frequency of the ...
... modulated line - to - line voltage is proportional to the modulation index , M , and the periodic time of the reference wave , T. Thus , the pulse duration , T ,, is pro- portional to MT , or M / ƒ , where ƒ is the frequency of the ...
Page 134
... Modulation index , M k = 2p + 1 0 0 0.2 0.4 0.6 k = p ± 2 ( b ) k = 3p + 2 0.8 1.0 Modulation index , M FIG . 4.25 . Harmonic content of the sinusoidal PWM voltage as a function of modulation index : ( a ) harmonic amplitude relative to ...
... Modulation index , M k = 2p + 1 0 0 0.2 0.4 0.6 k = p ± 2 ( b ) k = 3p + 2 0.8 1.0 Modulation index , M FIG . 4.25 . Harmonic content of the sinusoidal PWM voltage as a function of modulation index : ( a ) harmonic amplitude relative to ...
Page 135
... modulation in a sinusoidal PWM inverter : ( a ) comparator input voltages ... index is less than unity and pulse dropping does not occur . The output ... modulation in the preceding para- graphs , it was tacitly assumed that the sine wave ...
... modulation in a sinusoidal PWM inverter : ( a ) comparator input voltages ... index is less than unity and pulse dropping does not occur . The output ... modulation in the preceding para- graphs , it was tacitly assumed that the sine wave ...
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