50 KRPM, 1,100 degF, Magnetic Bearings for Jet Turbine Engines

The need for an increased jet turbine engines’ propulsion capability requires: (1) lightweight, (2) high-efficiency, (3) high-speed and (4) high-temperature components. These requirements put the conventional components such as the mechanical bearings under excessive constraints and make them obsolete. In this context, SatCon Technology Corporation has developed a highspeed, high-temperature (50 krpm, 600°C) magnetic bearing system that has the potential of meeting these requirements. This magnetic bearing system, comprised of two radial and one double acting thrust bearings, was successfully tested to 50,000 rpm. This paper describes the development of this system from its design through its fabrication and testing. Details on the system and component requirements are presented, along with a step-by-step design and trade-off analysis. Test data and their discussion are provided, as well.