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For the time being we have understood it such that he has an 50/60Hz power inverter rated 2.2 kW, 3-phase, 400 Volts (and perhaps 50 Hz or 60 Hz) depending upon where you are living. You have one pure sine wave inverter that you want to use for driving DC Motor. If your question is as above, I further understand that the 2.2 kW AC Drive/Inverter is basically an AC to AC frequency converter, perhaps for converting frequency from 50 Hz to
60 Hz or the other way round. And your question is that you have an identical 2.2 kW AC Drive/Inverter and want to use it for driving a DC Motor. If my understanding as described above is correct then my answer is that you cannot get DC from any intermediate stage because there is no storage battery there that can get charged and provide DC for running a motor. In place of any Battery the intermediate components are Capacitors and these are not of such capacity that they can provide you stable DC for running DC motor.