Method of operating a gas turbine engine

摘要

A method of operating a gas turbine engine (10) having a rotatable turbine shaft (14; 18) with an electric machine (24; 26) mounted to the shaft (14; 18). The method includes providing supplemental acceleration and/or deceleration of the turbine shaft (14; 18) of the gas turbine engine through the use of the electric machine (24; 26) operated as an electric motor and/or an electric generator, in order to avoid an undesirable engine speed range during engine operation.