I am designing an inverter in Ltspice and am looking to have a simple circuit to represent the motor load and filter out the PWM harmonics in order to obtain outputs. The motor characteristics are:
Synchronous Inductance: 500 uH
Resistance (line-neutral): 500 mohms
Will a RLC filter circuit similar to the image shown below work? If so what values should I use for the components (the PWM frequency I am trying to remove is 20kHz, will this use f=1/2*pi*RC)
I think I could do it for single phase however I am struggling with a 3 phase motor especially because of both resistor and inductor when calculating the values required for the filter.
Here is the overall circuit