Direct metering fuel system with an integral redundant motor pump

A direct metering fuel supply system, comprising:

• a pump housing;
• a plurality of axial gap motors disposed within the pump housing, each axial gap motor configured to be selectively energized and operable, upon being energized, to supply a drive torque at a drive speed;
• a fixed displacement, variable speed positive displacement piston pump disposed within the pump housing, the fixed displacement, variable speed positive displacement piston pump and coupled to each of the axial gap motors to receive the drive torque selectively supplied therefrom and operable, upon receipt of the drive torque, to supply fuel at a flow rate dependent on the drive speed;
• and
• a gas turbine engine control adapted to receive fuel flow commands and operable, in response to the fuel flow commands, to energize one of the plurality of axial gap motors,
• wherein each axial gap motor comprises:
• a pair of permanent magnet rotors, each rotor coupled to the fixed displacement, variable speed positive displacement piston pump and having a plurality of magnetic dipoles disposed thereon;
• and
• a stator having a plurality of independent stator coils disposed thereon, the stator disposed between, and spaced axially apart from, each of the rotors.

A direct metering fuel supply system, comprising:

• a plurality of axial gap motors, each axial gap motor configured to be selectively energized and operable, upon being energized, to supply a drive torque at a drive speed;
• a fixed displacement, variable speed positive displacement piston pump coupled to each of the axial gap motors to receive the drive torque selectively supplied therefrom and operable, upon receipt of the drive torque, to supply fuel at a flow rate dependent on the drive speed;
• and
• a gas turbine engine control adapted to receive fuel flow commands and operable, in response to the fuel flow commands, to energize one of the plurality of axial gap motors, the gas turbine engine control is further operable to determine operability of the energized axial gap motor and, based on this determination, to selectively deenergize the energized axial gap motor and energize a deenergized axial gap motor,
• wherein each axial gap motor comprises:
• a pair of permanent magnet rotors, each rotor coupled to the fixed displacement, variable speed positive displacement piston pump and having a plurality of magnetic dipoles disposed thereon;
• and
• a stator having a plurality of independent stator coils disposed thereon, the stator disposed between, and spaced axially apart from, each of the rotors.