High-speed generator with electromagnetic bearings for space electric power plants
Electrotechnology. Electromechanics
Аuthors
, ,Corporation "Space systems monitoring, information management and electromechanical systems" named A.G. Iosif'yan, "Corporation "VNIIEM", 4, Horomny deadlock, building 1, Moscow, 107078, Russia
Abstract
In this paper elaboration is presented and investigations are made for a possible design of high-speed (rotational frequency – 60000 rev/min) electric generators with power of 250 kW and electromagnetic bearings that can be used in gas turbine units with an energy conversion system for space electric power plants. Elaboration of the most optimal types of high-speed electric generators is done: synchronous generator with permanent magnet excitation and generator with out-closed magnetic flux. The study showed that it is impossible to make a generator with out-closed magnetic flux with power of 250 kW and rotational frequency 60000 rev/min. Therefore the only possible high-speed generator type is a synchronous generator with permanent magnet excitation. Electromagnetic bearing assemblies being able to provide sustained operation of a turbo-generator without maintenance are studied. Radial and axial electromagnetic bearing designs are defined. Design-theoretical study of electromagnetic bearing design characteristics is done. Calculation of critical rotational frequencies for the synchronous generator with permanent magnet excitation is made. This calculation showed that it is necessary to overcome minimum one critical rotational frequency.Keywords:
turbo-generator; electromagnetic bearing; gas bearing; synchronous generator with permanent magnet excitation; generator with out-closed magnetic fluxDownload