Patent ID: 9605597
Date: 2017-03-28
CPC Classifications: F01D,F02C,F05D,Y02E

Claim:
1. A gas turbine engine, comprising: a compressor including a combustor adjacent the compressor; a turbine adjacent the combustor, the turbine including a shaft coupled to the compressor rotor assembly and at least one turbine disk assembly; a motor coupled to the shaft; a variable frequency drive electrically connected to the motor and to an AC power source and configured to slow roll the gas turbine engine at shutdown, the variable frequency drive including an AC to DC voltage converter and a DC to AC voltage converter; a stored energy source; and a ride thru unit electrically connected to the variable frequency drive, the AC power source and the stored energy source, the ride thru unit including at least one DC to DC voltage converter, operable to monitor an AC power of the AC power source, and provide power from the stored energy source to the variable frequency drive through the ride thru unit when an interruption or loss of the AC power is detected while the shaft is turned with the motor for a predetermined amount of time after shutdown of the gas turbine engine; and a lube oil system including wherein the lube oil variable frequency drive is electrically connected to the ride thru unit and the ride thru unit is further configured to provide power from the stored energy source to the lube oil variable frequency drive through the ride thru unit up to a second predetermined amount of time when an interruption or loss of the AC power is detected during operation of the gas turbine engine, and shut down the gas turbine engine when the interruption or loss of the AC power lasts longer than the second predetermined amount of time.