How much DC voltage for a VFD?

[delwin]

Hello, I have some beginners questions about VFDs.
I'm planning to build a VFD for a ACIM, the motor is 3-phase, rated - Delta/Y 220V/380V(RMS). I'm going to use it in star configuration.
The mains supply is 220V single phase.
Now the question is, how much should be the DC Bus voltage, that feed the 3-phase inverter?
I'm going to control the switches (I assume IGBTs) with a PWM generated by a dsPIC, but the bus voltage is unclear to me.

Should 400VDC be enough, or should it be something like 560+VDC?

Please help, info on this subject is quite unavailable, especialy when it is non US(110VAC) setup.
10x in advance.

 

[Mehrshad74]

for a 220v output VFD and space vector the bus should be 300 to 350v
for 380v version 500 to 600v
if you use the motor in delta configuration you just need to rectify the 220v ac and put 1uf per watt electrolytic capacitor on DC link. (400V)
for instance a 2200w motor drive needs 2200uf/400v bus capacitor.
don't forget the inrush current limiter on your dc bus. It is a wire wound(10w for each 1000uf is fine) resistor in series with the cap and after a short time(>10RC) it should be shorted by a relay(5A/kw) .

 

[delwin]

So if I want to use the motor in 3-phase star configuration. I would need a 560VDC, is this correct?

 

[Mehrshad74]

Exactly...