Equivalent DC circuit of 3 phase induction motor
The average DC current will be determined by the total power delivered to the motor plus the losses in the inverter. The reactive component of the motor current will be seen as bus capacitor ripple current. I don't believe you have taken that into consideration.

If the losses are ignored, the power delivered by the DC link is equal to the mechanical power delivered by the motor. The average DC current is the mechanical power in watts delivered by the motor divided by the DC bus voltage.