Abstract
Radial turbines that have a permanent magnet generator rotor in a common shaft have been widely used for small turbines like a microturbine. Though one of the features for those turbo machineries is their capability to be configured with a simplified rotor configuration without gear boxes, thrust generated by the rotor system has to be canceled in the rotor system itself. A simple method is presented for thrust estimation which has been used in development of a 150kW class microturbine. This simple method for thrust estimation was applied to design a similar type of small radial inflow turbine. The turbine rotor was designed to satisfy both high turbine efficiency and low thrust. Experimental results of the prototype turbine load tests showed that the estimated thrust was within the design allowance range at the rated load.
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