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harmonic in inverter output

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bobbywu

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i have make inverter with unipolar pulse width modulation. the signal switching is 3Khz on 50 Hz as frequency fundamental. The harmonic occur in 6Khz.what happen if i use single phase motor as load. what the diiference about low order harmonic and high orde harmonic?thanks...
 

Lower order harmonics are generated by motor commutation and upper harmonics with induction noise .
High storage capacity is desirable across the motor for start and run.
However , powerfactor correction capacitor across input (AC caps --oil paper wound foil ) are a solution.
 

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