Patent ID: 6307278
Filing Date: 2001-10-23
Classification: F01D,F02C,F05D,H02K

Abstract:
A rotating group for a microturbine power generating system, comprising:a turbine wheel receiving expanding gas, the expanding gas causing the turbine wheel to rotate about an axis;a rotor having at least one rotor surface and a rotor bore concentric with the axis, at least a portion of said rotor being magnetic, wherein said at least one rotor surface is adapted for rotation within at least one foil journal bearing;a single tieshaft having a diameter of less than about one-half inch, the tieshaft being concentric with the axis and extending through the rotor bore, the tieshaft having a yield strength and being preloaded in tension to a predetermined percentage of said yield strength; andmeans for maintaining the tension in the tieshaft and securing said rotor and said turbine wheel to rotate in unison with the tieshaft.