How to convert modified sine to normal sine?

Question

Electronics

There is an inverter. At the output 220V 4000W modified sine.
It is necessary that a low-speed asynchronous motor work from it.
I read on the Internet about two LC circuits: one in parallel, the other in series, but this solution has its drawbacks.
I read about the usual construction of voltage stabilizers and did not find information on how they correct the voltage shape, if they correct at all.
Judging by the description, neither the relay type voltage regulator nor the "latter" type voltage regulator regulates the shape. At least not a word about it is written, and judging by the design.

Answer 1

if the passive filter does not suit you, then nothing. Or buy a new inverter.