Synchronous machine with harmonics dampening

Details Synchronous machine with harmonics dampening Synchronous machine with harmonics dampening

1995-02-15

1997-09-16

Wysocki, Jonathan

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318138, H02P 1300

Patent

active

056684584

ABSTRACT:
A synchronous machine effectively absorbs higher harmonics in an AC system to which the synchronous machine is linked. The synchronous machine includes a damper winding, disposed on each magnetic pole and constituting by itself an independent closed circuit; capacitors, each of which is connected in parallel with each of several damper winding divisions obtained by dividing the damper winding at predetermined winding turns; a DC reactor for blocking flowing-in of higher harmonics to a DC power supply for DC excitation; a series resonant circuit further including the damper winding and the capacitors; and a series resonant circuit including the field winding and capacitors. Resonant frequencies of both series resonant circuits are set at 6 nf (n: an integer, f: a fundamental frequency) so as to greatly reduce impedance of the damper winding and the field circuit seen from an armature of the synchronous machine, by which to extinguish or reduce higher harmonics (6n.+-.1)f of the AC system.

REFERENCES:
patent: 1894455 (1933-01-01), Youhouse
patent: 3686523 (1972-08-01), Gordon et al.
patent: 3983469 (1976-09-01), Brown
patent: 4053820 (1977-10-01), Peterson et al.
patent: 4206395 (1980-06-01), Okuyama et al.
patent: 4426606 (1984-01-01), Suita et al.
patent: 4494050 (1985-01-01), Godfrey et al.
patent: 4723202 (1988-02-01), Kalman
patent: 4885526 (1989-12-01), Szabo

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