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A compressor assembly (10) has a fluid inlet positioned to facilitate the passage of a fluid. The compressor assembly includes a compressor housing (60) defining a compressor inlet (35), a compressor rotating element (45) rotatably supported at least partially within the compressor housing, and an i

A compressor assembly (10) has a fluid inlet positioned to facilitate the passage of a fluid. The compressor assembly includes a compressor housing (60) defining a compressor inlet (35), a compressor rotating element (45) rotatably supported at least partially within the compressor housing, and an inlet guide vane assembly (500) including a housing (505) that defines a flow passage (525), a plurality of vanes (540), and a guide ring (555). Each of the plurality of vanes is rotatably supported by the housing and is coupled to the guide ring such that each of the vanes is rotatable simultaneously between a first position and a second position to control the quantity of fluid that passes through the flow passage to the compressor rotating element.

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1. A compressor assembly having a fluid inlet positioned to facilitate the passage of a fluid, the compressor assembly comprising: a compressor housing defining a compressor inlet;a compressor rotating element rotatably supported at least partially within the compressor housing;an inlet guide vane a

1. A compressor assembly having a fluid inlet positioned to facilitate the passage of a fluid, the compressor assembly comprising: a compressor housing defining a compressor inlet;a compressor rotating element rotatably supported at least partially within the compressor housing;an inlet guide vane assembly including a housing that defines a flow passage, a plurality of vanes, and a guide ring, each of the plurality of vanes being rotatably supported by the housing and coupled to the guide ring such that each of the vanes is rotatable simultaneously between a first position and a second position to control the quantity of fluid that passes through the flow passage to the compressor rotating element; anda plurality of individual vane actuators, each individual vane actuator connecting one of the plurality of vanes to the guide ring, wherein at least one of the individual vane actuators includes a yoke with a slot and a bearing member in the slot, wherein the yoke is fixedly attached to one of the vanes and the bearing member is directly connected to the guide ring. 2. The compressor assembly of claim 1, wherein each vane is substantially triangular and includes two substantially linear sides. 3. The compressor assembly of claim 2, wherein each side includes an upstream bevel and a downstream bevel and wherein the upstream bevel and the downstream bevel are not equal in size. 4. The compressor assembly of claim 1, wherein each vane includes a first substantially planar surface and a second substantially planar surface opposite and parallel to the first substantially planar surface. 5. The compressor assembly of claim 1, wherein the compressor rotating element is a centrifugal impeller. 6. The compressor assembly of claim 1, wherein the compressor rotating element is a rotary screw. 7. The compressor assembly of claim 1, wherein the slot is U-shaped and the yoke includes two legs along the slot, and wherein the bearing member engages the two legs to couple the yoke to the guide ring. 8. The compressor assembly of claim 7, wherein the bearing member includes a spherical plane bearing having a spherical member and an outer race. 9. The compressor assembly of claim 8, wherein each of the legs includes a slot sized to receive and guide the outer race. 10. A compressor assembly comprising: a compressor housing defining a compressor inlet;a compressor rotating element rotatably supported at least partially within the compressor housing;an inlet guide vane housing coupled to the compressor housing and including a flow passage;a guide ring rotatably supported by the inlet guide vane housing and rotatable around the inlet guide vane housing;a guide vane supported by the inlet guide vane housing and rotatable between a closed position and an open position;a shaft fixedly connected to the guide vane and extending radially through the inlet guide vane housing;a yoke fixedly connected to the shaft such that movement of the yoke causes a corresponding movement of the guide vane, the yoke defining a slot; anda bearing member engaged in the slot and arranged to interconnect the guide ring and the yoke such that rotation of the guide ring around the inlet guide vane housing produces a corresponding rotation of the yoke. 11. The compressor assembly of claim 10, wherein the guide vane is substantially triangular and includes two substantially linear sides. 12. The compressor assembly of claim 11, wherein each side includes an upstream bevel and a downstream bevel and wherein the upstream bevel and the downstream bevel are not equal in size. 13. The compressor assembly of claim 10, wherein the vane includes a first substantially planar surface and a second substantially planar surface opposite and parallel to the first substantially planar surface. 14. The compressor assembly of claim 10, wherein the compressor rotating element is a centrifugal impeller. 15. The compressor assembly of claim 10, wherein the compressor rotating element is a rotary screw. 16. The compressor assembly of claim 10, wherein the slot is U-shaped and the yoke includes two legs along the slot, and wherein the bearing member engages the two legs to couple the yoke to the guide ring. 17. The compressor assembly of claim 16, wherein the bearing member includes a spherical plane bearing having a spherical member and an outer race. 18. The compressor assembly of claim 17, wherein each of the legs includes a slot sized to receive and guide the outer race. 19. A compressor assembly comprising: a compressor housing defining a compressor inlet;a compressor rotating element rotatably supported at least partially within the compressor housing;an inlet guide vane housing coupled to the compressor housing and including a flow passage;a guide ring rotatably supported by the inlet guide vane housing and rotatable around the inlet guide vane housing; a plurality of guide vanes supported by the inlet guide vane housing with each vane of the plurality of guide vanes being rotatable between a closed position and an open position;a plurality of individual vane actuators arranged such that each of the individual vane actuators is directly connected to one of the plurality of vanes and is coupled to the guide ring; andan actuator coupled to a selected one of the individual vane actuators and operable to move the selected individual vane actuator between a first position and a second position to move the corresponding guide vane between the closed position and the open position, movement of the selected individual vane actuator simultaneously moving the guide ring to move each of the remaining individual vane actuators between the first position and the second position such that each of the corresponding vanes moves between the closed position and the open position in unison, wherein at least one of the individual vane actuators includes a yoke with a slot and a bearing member in the slot, wherein the yoke is fixedly attached to one of the vanes and the bearing member is directly connected to the guide ring. 20. The compressor assembly of claim 19, wherein the compressor rotating element is a centrifugal impeller. 21. The compressor assembly of claim 19, wherein the compressor rotating element is a rotary screw. 22. The compressor assembly of claim 19, wherein the slot is U shaped and the yoke includes two legs along the slot, and wherein the bearing member engages the two legs to couple the yoke to the guide ring. 23. The compressor assembly of claim 22, wherein the bearing member includes a spherical plane bearing having a spherical member and an outer race. 24. The compressor assembly of claim 23, wherein each of the legs includes a slot sized to receive and guide the outer race.