No abstract available

[en] This paper describes the application of subsystem summary algorithms for self-contained power system configuration trade-off studies and presents the results of a recently completed study. The development of summary weight algorithms for rocket turbines and rotating electrical generators is described. These new algorithms are combined with previously developed power conditioning subsystem algorithms in a computer program to automatically study various system configurations. A flow chart of the computer program is included in the paper. The computer program was used to find a minimum weight self-contained power system. Results of the study are presented in this paper

No abstract available

[en] One of the vital problems in developing high-speed cryogenically cooled electrical machines with a cryostat common to rotor and stator is availability of reliable shaft seals. Depending on the electric machine design, reliable rotary seals are required both for working media sealing and for maintaining vacuum in rotating cryostats. Newly designed rotary seals employ the principles of radial hydrodynamic sealing. Tentative experimental studies proved the advantages of the new design over the traditional radial hydrodynamic seals. Pressure difference withstood by the new seals with no obvious sealed media leaks is about 1.5 times greater than that provided by a conventional seal

[en] The role of the 5 MJ homopolar machine at the Center for Electromechanics has changed from that of a pulsed power supply experiment to that of a power supply for various experiments. Because of this change in duty, it was necessary to modify the machine to allow more efficient operation and easier connection of the machine to the load

[en] The Fast Discharge Experiment (FDX) is a 0.36 MJ, 200 V homopolar machine designed to discharge in one millisecond. This experiment is intended to establish the fundamental limitations involved in extracting energy in the shortest time from a flywheel using homopolar conversion. After initial testing of FDX was completed and data was analyzed, problems limiting performance were identified. Various components of the machine were redesigned and modified to correct these problems. A second set of tests, including short circuit discharges from various speeds, has recently been conducted. Results and analysis of these tests will be presented. New problems encountered as well as recommendations for additional work will also be given

[en] The discharge of shock homopolar generator without a ferromagnetic core and with a water-cooled exciting winding, consuming high power is considered. The discharge is carried out at pulsed excitation which makes it possible to decrease the thermal load of the winding and to release its necessary power. Upon exciting the generator , the winding is short-circuited and its power supply is off. This allows the stored energy to be reduced. The analysis of the transient porcess in the generator-load circuit is geven. As a result, the diagrams are obtained that allow the calculation of current pulse characteristics to be carried out. In case the parameters of the shock homopolar generator and the load are matched properly, the use of the excitation method described may be very efficient. To reduce the time necessary to exite the generator, a shock synchronous generator may be used as an exciter that is switched in when its e.m.f. is zero. The fast excitation of the generator makes, it possible not to use a contactor in the circuit as discharge currents of the generator may be of some million amps

[en] To create a powerful pulse power source which can operate in the regime of pulse repetition with the frequency of up to several hundred Hz, a model of compression generator on the basis of the d.c. unit ANDM-150O/750, 10 kW, is developed. The rotor and stator are manufactured of electrical sheet steel. The packet length is 425 mm, the rotor diameter is 280 mm, the size of aluminiUm busbar = 8x3 mm, the generator weight equals 400 kg. The model showed high specific characteristics: energy transferred per pulse - 25 J/kg, pulse capacity - 25 kW/kg

No abstract available

[en] Condition monitoring of rotating machine is essential to guarantee the safety operation as well as to improve the efficiency of nuclear power plants operations. One of the promising condition monitoring techniques which has been preferred currently since it is simple, non-invasive and inexpensive is Motor Stator Signature Analysis (MCSA). However, the investigation of the MCSA technique using a compact, low cost, and having industrial class hardware which is capable for nuclear power plant applications has been limited. The research is aimed to develop condition monitoring method based on MCSA utilizing a compact industrial class for nuclear power plant. The investigation includes development of condition monitoring based on real-time FPGA-CompatRIO hardware, development of a custom built display module for early warning system, testing of the monitoring hardware, fault frequency analysis of electric motors including the performances of fault detections. The condition monitoring system is able to execute a fault detection task around 164 ms, to recognize accurately fault frequencies of stator shorted turn for about 75%, broken rotor bar around 95%, eccentricity 65%, mechanical misalignment 85%, including supply voltage unbalances 100%. The condition monitoring system based on its performance assessments could become a suitable alternative not only for rotating machines but also condition monitoring for other nuclear reactor components. (author)