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Over-modulation of a PWM inverter produces

  • A.a perfectly sinusoidal output of larger amplitude
  • B.a reduction in the fundamental output voltage
  • C.an increase in the switching frequency of the inverter
  • D.low-order harmonics in the output

Answer: D

Once pulses begin to be dropped, the output is no longer a faithful reproduction of the reference and harmonics at low multiples of the fundamental appear. Those harmonics produce torque ripple and extra loss in the machine.

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