In a steady state regime we want to supply the load with voltages that form a balanced tri phased system of sinusoidal voltages:
In the case of the sine wave modulation we consider:
As we must have
the voltages must have a peak amplitude U0 so that
We can write
which leads to:
The coefficient r is called the amplitude modulation factor
If we normalize the amplitude of the reference voltages, that means if , we'll obtain:
Figure 2