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Dead time and current waveform?

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seyyah

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In 6 switch 3 ph inverter i'm generating 3ph sinusoidal signal and applying to a 3ph motor.. I'm using a dead time of 3.3us. With a locked rotor output voltage waveform is pure sinusoidal. But while motor revolves it's not pure and distorted around the zero crossing point significantly.
1- How can we determine the min dead time to avoid this?
2- How can we avoid this?
 

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