Redundant electrically driven fuel and oil pumping system for gas turbines

A pumping system for use with a gas turbine engine, the pumping system comprising:

• a motor generator having a plurality of windings;
• a first pump motor, a second pump motor, a third pump motor, a fourth pump motor, a first pump, a second pump, a third pump, a first pump shaft, a second pump shaft, a third pump shaft, a first overrunning clutch, and a second overrunning clutch, each of the first pump motor, the second pump motor, the third pump motor, and the fourth pump motor being electrically connected to the plurality of windings, the first pump motor being coupled to the first pump via the first pump shaft and the second pump motor being coupled to the second pump via the second pump shaft such that the first pump is being driven by the first pump motor in response to at least one of the second pump and the second pump motor becoming inoperable, and the third pump motor and the fourth pump motor being mechanically coupled with the third pump via the third pump shaft such that the third pump is driven by both or a single one of the third pump motor and fourth pump motor, the first overrunning clutch being coupled with the third pump motor and the third pump and the second overrunning clutch being coupled with the fourth pump motor and the third pump such that the first overrunning clutch is located between the third pump motor and the third pump, the second overrunning clutch is located between the fourth pump motor and the third pump, and the third pump is located between the first overrunning clutch and the second overrunning clutch.

A method for use with a gas turbine engine, the method comprising supplying electric power to a first pump motor from a first winding,

• supplying electric power to a second pump motor from a second winding,
• supplying electric power to a third pump motor from the first winding,
• supplying electric power to a fourth pump motor from the second winding,
• driving a first pump with the first pump motor via a first pump shaft,
• driving a second pump with the second pump motor via a second pump shaft,
• driving a third pump with both or a single one of the third pump motor and the fourth pump motor via a third pump shaft,
• driving the first pump with the first pump motor and the second pump with the second pump motor in response to the other of the first pump motor and the second pump motor becoming inoperable such that the operable motor of the first pump motor and the second pump motor continuously provides flow of fluid to the gas turbine engine without interruption, and
• driving the third pump with one of the third pump motor and the fourth pump motor in response to the other of the third pump motor and the fourth pump motor becoming inoperable such that the operable motor of the third pump motor and the fourth pump motor continuously drives the third pump without interruption, and
• decoupling the inoperable one of the third pump motor or the fourth pump motor from the third pump shaft via a overrunning clutch in response to the third pump motor or the fourth pump motor becoming inoperable.