The development of pump motors is considered, along with their influence on the evolution of electric pumps as a whole. The thermoregulation systems developed for this purpose consist basically of heat exchangers, pipelines, ventilators, and electric pumps. The development of electrical pumps for satellites demands optimal selection of the pump hydraulic power and also the types of pump and electric drive, so as to ensure: (a) maximum efficiency and duration of continuous operation, (b) minimum mass and energy consumption, (c) the ability of pump components to operate in vacuum and in contact with various coolants. Thermoregulation systems may be characterized as low-flow, low-speed pumps. Such pumps were first developed to cool the instruments in the Molniya communications satellite at the end of the 1950s. The pump unit developed consists of the pump itself, an electric motor with a magnetic clutch separating the brush-commutator assembly from the coolant, and a reducing gear (from 2500 to 800 rpm). The results of many years of progress in developing electric pump units for the thermoregulation systems of satellites are: (a) the development of contactless DC (Direct Current) motors, (b) the development of motor power from 1 to 100 W, with increase in the power/mass ratio from 2.0 to 40.0 W/kg and in the working life from 2000 to 100,000 hours, (c) increase in the pump speed coefficient (with fixed flow-rate/head ratio) from 15 to 100 and increase in pump efficiency to 0.6.
Contactless DC motors in electric pumps of spacecraft
Berührungslose Gleichstrompumpenmotoren für Raumfahrzeuge
Russian Electrical Engineering ; 70 , 6 ; 13-16
1999
4 Seiten, 3 Bilder, 3 Quellen
Article (Journal)
English
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