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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...
 

vimalkhanna

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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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