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DC link capacitor values calculation in a 2 leg inverter

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Stagmang

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Dear All,
I would like to know the formula to calculate the capacitance for two capacitors whose midpoint is connected to a third phase of brushless dc motor (For simplification one can consider "series RL" load connected in WYE or DELTA fashion). Overall its about driving a 3 phase motor with 4 mosfets/igbt connected to 2 of the phases and one phase to dc link midpoint. I am not understanding how to calculate the capacitor values as winding's of load may have an impact on them. What all factors impact the capacitance value calculation?
If suppose Vdc supply voltage, inverter output frequency, RL load values, rated speed and rated current of motor winding's known.
Kindly give me your valuable inputs.
Thank you in advance
 
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