Don Stanley wrote: > Hi Stuart: > Yes, especially if wound on a laminated core like a 3 phase transformer. > Actually, because of the high PWM frequency of the VFD, standard laminated steel transformer cores are not ideal. Ferrite cores will do much better. I have a high-speed spindle motor that has too low inductance, so I used some Renco 1.6 mH "bobbin" style ferrite inductors. This wasn't strictly a noise issue, it was to keep the PWM pulses from saturating the motor's iron core. But, ferrite core inductors should work fine for the noise issue, too. Probably 100 uH with a current rating to match the motor would do well. 3 separate cores would be better than one common one.
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