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9th International Conference on Compressors and their Systems IOP Publishing IOP Conf. Series: Materials Science and Engineering 90 (2015) 012062 doi:10.1088/1757-899X/90/1/012062 it was decided to use a hybrid design for these machines to ensure extended bearing life in harsh environments. Compressed air is supplied to the journal bearings via small ports in the pads to allow the shaft to float before the machine starts to rotate. Thus the bearings operate in a hydrostatic mode. When a pre-set speed has been reached the compressed air is switched off so the bearings operate hydrodynamically. The thrust bearing consists of two sets of opposing tilting pad air bearings. Due to the high loads encountered it was necessary to maximise the capacity of the bearings within a very confined space. The disc on the shaft that provides the counter-face for the bearings is limited in diameter by the stresses imposed by rotating at such high speeds. This has the effect of limiting the bearing surface area available. The system employed uses a combination of hydrostatic and hydrodynamic operation. An external compressed supply is fed to the bearings when required under command of the machine controller. 3.3 Turbine A radial inflow turbine was selected for this duty. Design metrics for the duty fall within normal bounds for this class of device and in the absence of condensation a high adiabatic efficiency would be expected. As the steam entering the package is dry saturated, condensation would occur within the stage, leading to a reduction in adiabatic efficiency and potentially to erosion. It was established that good design should allow these risks to be mitigated. 3.4 Generator The generator is a two pole permanent magnet machine which is integrated on the same shaft as the turbine. The windings are formed as six turns around an electrical steel stator in an aluminium casing. A challenge with this type of machine is to limit the length of the end turns so as to keep the overall shaft length as short as possible. In this machine the end turns are formed after winding to control the shape. The machine uses water cooling in a jacket around the stator and forced air cooling in the air gap. Performance was optimised to give the desired output with a margin within the capability of a Class H insulation system. Figure 4. Prototype Spirax Sarco TurboPower Package. The approach to the package design was to employ best the practice used in packaging of similar machinery to produce a robust, compact and aesthetically pleasing unit. See Figure 4. It was 3.5 Package 5PDF Image | IOP Science The Development of a Small High Speed Steam Microturbine Generator System
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