Electrical Engineering > GATE 2025 > Inverters
The 3-phase modulating waveforms (va(t),vb(t) and vc(t)), used in sinusoidal PWM in a Voltage Source Inverter (VSI) are
va(t)=0.8 sin(ωt)V
vb(t)=0.8 sin(ωt-2π/3)V
vc(t)=0.8 sin(ωt+2π/3)V
where ω=2π×40 rad/s is the fundamental frequency. The modulating waveforms are compared with a 10 kHz triangular carrier whose magnitude varies between +1 and -1. The VSI has a DC link voltage of 600 V and feeds a star connected motor. The per phase fundamental RMS motor voltage, in volts, is closest to
va(t)=0.8 sin(ωt)V
vb(t)=0.8 sin(ωt-2π/3)V
vc(t)=0.8 sin(ωt+2π/3)V
where ω=2π×40 rad/s is the fundamental frequency. The modulating waveforms are compared with a 10 kHz triangular carrier whose magnitude varies between +1 and -1. The VSI has a DC link voltage of 600 V and feeds a star connected motor. The per phase fundamental RMS motor voltage, in volts, is closest to
Correct : d
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