A rotary actuator is provided. The rotary actuator includes a stator assembly centered along a longitudinal axis of the rotary actuator. The rotary actuator also includes a rotor assembly surrounding the stator assembly. The rotor assembly is rotatable about the longitudinal axis relative to the sta
A rotary actuator is provided. The rotary actuator includes a stator assembly centered along a longitudinal axis of the rotary actuator. The rotary actuator also includes a rotor assembly surrounding the stator assembly. The rotor assembly is rotatable about the longitudinal axis relative to the stator assembly. The rotary actuator also includes first and second bearing assemblies mounted at adjacent opposed axial ends of the stator assembly and connected between the stator assembly and rotor assembly to allow for the rotation of the rotor assembly about the longitudinal axis relative to the stator assembly. A hydraulic actuation arrangement is formed between the rotor assembly and the stator assembly. The hydraulic actuation arrangement includes at least one first pressure chamber and at least one second pressure chamber. At least one of the at least one first pressure chamber and the at least one second pressure chamber has a variable volume.
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1. A rotary actuator for actuating the variable stator vanes of a compressor section of a turbine engine, the rotary actuator comprising: a stator assembly centered along a longitudinal axis of the rotary actuator;a rotor assembly surrounding the stator assembly; the rotor assembly rotatable about t
1. A rotary actuator for actuating the variable stator vanes of a compressor section of a turbine engine, the rotary actuator comprising: a stator assembly centered along a longitudinal axis of the rotary actuator;a rotor assembly surrounding the stator assembly; the rotor assembly rotatable about the longitudinal axis relative to the stator assembly;first and second bearing assemblies mounted at adjacent opposed axial ends of the stator assembly and connected between the stator assembly and rotor assembly to allow for the rotation of the rotor assembly about the longitudinal axis relative to the stator assembly; anda hydraulic actuation arrangement formed between the rotor assembly and the stator assembly, the hydraulic actuation arrangement including at least one first pressure chamber and at least one second pressure chamber, an at least one rotor vane of the rotor assembly located between the at least one first pressure chamber and the at least one second pressure chamber, the at least one first pressure chamber operable to receive a hydraulic fluid at a first pressure, the at least one second pressure chamber operable to receive a hydraulic fluid at a second pressure different than the first to create a pressure differential between the at least one first and second pressure chambers operable to rotate the at least one rotor vane and the rotor assembly about the longitudinal axis;further comprising an inlet manifold, the inlet manifold having a first inlet and a second inlet, and wherein the stator assembly includes an internal cavity defining a first inlet chamber and a second inlet chamber, the first inlet chamber in fluid communication with the first inlet, the second inlet chamber in fluid communication with the second inlet. 2. The rotary actuator of claim 1, further comprising an inlet tube extending from the first inlet and fluidly sealing the first inlet chamber from the second inlet chamber. 3. The rotary actuator of claim 2, wherein the first inlet chamber includes at least one inlet port fluidly communicating the first inlet with the least one first pressure chamber, and wherein the second inlet chamber includes at least one inlet port fluidly communicating the second inlet with the at least one second pressure chamber. 4. The rotary actuator of claim 1, wherein the hydraulic actuation arrangement includes at least one stator vane extending radially outward from a center of the stator assembly, and the at least one rotor vane extending radially inward from an interior hollow surface of an outer housing of the rotor assembly, the at least one stator vane sealingly engaging the interior surface of the rotor housing, the at least one rotor vane sealingly engaging an exterior surface of the stator assembly. 5. The rotary actuator of claim 4, wherein the at least one first pressure chamber is formed on a first side of the at least one stator vane, and wherein the at least one second pressure chamber is formed on a second side of the at least one stator vane. 6. The rotary actuator of claim 1, further comprising at least one connection element formed on an exterior of the rotor assembly, the at least one connection element configured to connect the rotor assembly to a unison ring of the compressor section of the turbine engine. 7. The rotary actuator of claim 1, wherein at least one of the at least one first pressure chamber and the at least on second pressure chamber has a variable volume. 8. A rotary actuator for actuating the variable stator vanes of a compressor section of a turbine engine, the rotary actuator comprising: a stator assembly centered along a longitudinal axis of the rotary actuator;a rotor assembly surrounding the stator assembly; the rotor assembly rotatable about the longitudinal axis relative to the stator assembly;first and second bearing assemblies mounted at adjacent opposed axial ends of the stator assembly and connected between the stator assembly and rotor assembly to allow for the rotation of the rotor assembly about the longitudinal axis relative to the stator assembly; anda hydraulic actuation arrangement formed between the rotor assembly and the stator assembly, the hydraulic actuation arrangement including at least one first pressure chamber and at least one second pressure chamber, an at least one rotor vane of the rotor assembly located between the at least one first pressure chamber and the at least one second pressure chamber wherein at least one of the at least one first pressure chamber and the at least one second pressure chamber has a variable volume; andan inlet manifold, the inlet manifold having a first inlet and a second inlet, and wherein the stator assembly includes an internal cavity defining a first inlet chamber and a second inlet chamber, the first inlet chamber in fluid communication with the first inlet, the second inlet chamber in fluid communication with the second inlet. 9. The rotary actuator of claim 8, wherein the hydraulic actuation arrangement includes at least one stator vane extending radially outward from a center of the stator assembly, and the at least one rotor vane extending radially inward from an interior hollow surface of an outer housing of the rotor assembly, the at least one stator vane sealingly engaging the interior surface of the rotor housing, the at least one rotor vane sealingly engaging an exterior surface of the stator assembly. 10. The rotary actuator of claim 9, wherein the at least one first pressure chamber is formed on a first side of the at least one stator vane, and wherein the at least one second pressure chamber is formed on a second side of the at least one stator vane. 11. A method of actuating the unison rings of a compressor section of a turbine engine using a rotary actuator, the method comprising the steps of: providing a hydraulic actuation arrangement formed between a rotor assembly and a stator assembly, the hydraulic actuation arrangement including at least one first pressure chamber and at least one second pressure chamber, an at least one rotor vane of the rotor assembly located between the at least one first pressure chamber and the at least one second pressure chamber;providing an inlet manifold, the inlet manifold having a first inlet and a second inlet, and wherein the stator assembly includes an internal cavity defining a first inlet chamber and a second inlet chamber, the first inlet chamber in fluid communication with the first inlet, the second inlet chamber in fluid communication with the second inlet;supplying fluid at a first pressure to the at least one first pressure chamber of the hydraulic actuation arrangement of the rotary actuator;supplying fluid at a second pressure to the at least one second pressure chamber of the hydraulic actuation arrangement of the rotary actuator; andwherein the steps of supplying the fluid at first and second pressures creates a force imbalance acting upon the hydraulic actuation arrangement to rotate the at least one rotor blade of the rotator assembly and the rotor assembly of the hydraulic actuation arrangement relative to the stator assembly about a longitudinal axis of the rotary actuator.
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