Submerged motor pumps for liquefied natural gas service are usually supported by special ball bearings, but the life of these bearings is not long enough. To improve this problem we have developed a high speed submerged motor pump supported by active magnetic bearings for liquefied natural gas service. If we could decrease the number of impellers because of the high rotating speed of the rotor, then the pump casing can become smaller. The magnetic bearings of this submerged motor pump are five-axis type active magnetic bearings. To control the rotor in the thrust direction, we used magnetic bearings and the liquid thrust equalizing mechanism (TEM). The mass of the rotor of this high speed submerged motor pump is about 50 kg. The designated speed of the rotor is about 16400 rpm. The magnetic bearings facilitated stable rotor rotation in LNG, and the magnetic bearings kept good stability under the cavitation pump condition. Further, we could rotate the rotor under closing flow rate conditions associated with complicated flow forces.
High speed submerged motor pump for liquefied natural gas service supported by magnetic bearings
Hochgeschwindigkeits-Tauchmotorpumpe mit Magnetlagerung zum Fördern von Flüssigerdgas
ISMB, Magnetic Bearings, International Symposium, 3 ; Jul ; 401-410
1992
10 Seiten, 14 Bilder, 1 Quelle
Conference paper
English
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