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Motor cooling and oil management in the motor/compressor unit required careful balancing of pressures in its three internal cavities. In addition, lubricant thermal stability testing was completed. Figure 3.2.4.8 shows oil samples maintained at 212F for several weeks without metals and at 392F with metals. Clearly, the oil stability is affected at the higher temperature in the presence of metals. Passivating the metal surfaces allows long- term operation at 347F without loss of stability. a. b. Figure 2.3.8 Long-term lubricant stability test results 2.3.2.3 Motor and oil cooling system modifications The interdependent oil management and motor cooling systems were completely redesigned. Earlier testing was often limited by significant losses of oil from the gearbox sump. These losses primarily occurred when initiating turbine operation from turbine bypass, and when the motor cooling system was manually actuated. Analysis of the system data showed that large pressure differences could occur between the motor cavity and the transmission cavity in these circumstances, causing ejection of bearing lubrication oil into the motor casing and subsequently into the system. Also, with a single coolant stream feeding the motor and oil cooler in series, we found it difficult to get the correct balance between cooling loads. To resolve these problems, the cooling system was revised to feed the motor and oil cooling loads in parallel. These cooling circuits are illustrated in Figure 2.3.9. Management of oil inventory during transients was determined to be primarily an operational issue. To study this problem in more detail, a sophisticated UV spectrophotometer system was installed to measure oil concentration at the refrigerant- pump outlet as a function of time. Oil losses can now be correlated with all other system data, allowing diagnosis and control of the phenomenon shown below in Figure 2.3.10. 63PDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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