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You could use a full-wave rectifier to generate the DC.
If the motor can tolerate the rectified AC pulses directly from the rectifier, than the RMS value of the rectified AC will be 220V.
If the motor must see smooth DC then you will need to filter the rectified AC. That will give a higher DC voltage since it will now be near the peak voltage of the 220VAC or about 308V. You will then need a regulator to reduce the voltage. That can dissipate a lot of heat depending upon how much current the motor requires.
You don't need a transformer but then there is a shock hazard from the power to ground and you must take precautions for that.