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I was reading about the SPWM Bipolar Scheme for inverters the book said that we choose the frequency modulation ratio be odd to obtain only odd harmonics.

What happens if we choose the frequency modulation ratio as even ? Do we obtain even and odd harmonics in the frequency spectrum.

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  • \$\begingroup\$ I believe the problem with even harmonics is the lack of prime numbers. The more ways you can factor a number and the more similar its factors the more harmonic problems you will have IIRC. I believe someone else will explain much better so I won't write this as an answer. Every even number by definition shares a factor, which makes all even numbers other than 2 inferior on average to all odd numbers, and all of the "cherries" save 2(prime numbers) are odd. IIRC anyway. \$\endgroup\$ – K H Oct 2 '18 at 23:55

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