Conceptual Design of High-Speed Permanent-Magnet Generator for a Micro Gas Turbine

A conceptual design of a high-speed permanent-magnet generator for a micro gas turbine serving as an auxiliary power unit to be utilized in non-road mobile machinery (NRMM) is described. A new type of slot less generator is proposed for the NRMM. The high-speed generator design must take into consideration the various aspects of the micro gas turbine including the effect of the mechanical properties, the turbine and the compressor properties as well as the load cycles of the vehicle. Analysis is performed on the rotor parts of the generator to define the mechanical and thermal strength of the rotor. After adjustments of the rotor parameters they are used to complete the electromagnetic model of the generator. An analytical electromagnetic analysis of the generator is performed and then compared with the finite element analysis (FEA) to determine the efficiency and the losses.