Synchronous machine with harmonics dampening

A rotating field synchronous machine comprising;

• magnetic poles;
• a field winding disposed on said magnetic poles;
• a DC reactor between said field winding and a DC excitation power supply for said field winnding, for blocking flowing-in of higher harmonics to said DC excitation power supply;
• and
• a capacitor connected in parallel with said field winding on the field winding side of said DC reactor;
• thereby forming a series resonant circuit which includes said capacitor and said field winding, so that said series resonant circuit resonates at a specific resonant frequency.

A rotating field synchronous machine comprising;

• magnetic poles;
• a damper winding disposed on each of said magnetic poles and constituting by itself an independent closed circuit, said damper winding being divided into predetermined number of winding divisions, each thereof having predetermined winding turns;
• first capacitors, each thereof being connected in parallel with each of said winding divisions;
• a first series resonant circuit, further comprising said first capacitors and said damper winding, for resonating at a first resonant frequency;
• a field winding disposed on said magnetic poles;
• a second capacitor connected in parallel with said field winding;
• and
• a second series resonant circuit, further comprising said second capacitor and said field winding, for resonating at a second resonant frequency.