Three phase inverter

I would like to know the issues having in this circuit. for the output I am getting 60Vdc with or without the load.

AhmedFizn said:

for the output I am getting 60Vdc with or without the load

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That is probably correct for the circuit as drawn

You have a uni-polar 120v supply referenced to "earth"
60v is half of 120v.

Consider a conventional 3 phase supply,
the star point is connected to "earth" and the phases vary + and - about the reference earth.
So for a balanced load connected to such a supply, the star point will be at 0v.

JimB

Thank you