Abstract: A power turbine speed control system for a turbo-shaft type gas turbine engine that has a gas generator compressor spool and a power turbine spool and drives an electrical generator that powers at least one electrical load by way of at least one electrical bus, comprises a power turbine controller that senses the rotary speed of the power turbine spool and generates at least one signal that changes the torque of the electrical generator in response to the sensed change in the rotary speed of the power turbine spool.

Abstract: A power turbine speed control system for a turbo-shaft type gas turbine engine that has a gas generator compressor spool and a power turbine spool and drives an electrical generator that powers at least one electrical load by way of at least one electrical bus, comprises a power turbine controller that senses the rotary speed of the power turbine spool and generates at least one signal that changes the torque of the electrical generator in response to the sensed change in the rotary speed of the power turbine spool.

Abstract: An electrodynamic machine has a winding and a switching arrangement effectively dividing the winding into individually controllable portions. During a first operating condition, current flows through the entire winding in a manner controlled by the switching arrangement. In a second condition, the switching arrangement restricts current flow to only a portion of the winding. The second condition effectively reduces the inductive capacity of the winding.

Abstract: A power turbine speed control system for a turbo-shaft type gas turbine engine that has a gas generator compressor spool and a power turbine spool and drives an electrical generator that powers at least one electrical load by way of at least one electrical bus, comprises a power turbine controller that senses the rotary speed of the power turbine spool and generates at least one signal that changes the torque of the electrical generator in response to the sensed change in the rotary speed of the power turbine spool.

Abstract: A power turbine speed control system for a turbo-shaft type gas turbine engine that has a gas generator compressor spool and a power turbine spool and drives an electrical generator that powers at least one electrical load by way of at least one electrical bus, comprises a power turbine controller that senses the rotary speed of the power turbine spool and generates at least one signal that changes the torque of the electrical generator in response to the sensed change in the rotary speed of the power turbine spool.

Abstract: A power turbine speed control system for a turbo-shaft type gas turbine engine that has a gas generator compressor spool and a power turbine spool and drives an electrical generator that powers at least one electrical load by way of at least one electrical bus, comprises a power turbine controller that senses the rotary speed of the power turbine spool and generates at least one signal that changes the torque of the electrical generator in response to the sensed change in the rotary speed of the power turbine spool.

Abstract: A torque tube assembly for transmitting rotational force from a first end to a second end includes a number n of concentric elongate torque tubes, where n is an odd integer greater than or equal to three. The concentric elongate torque tubes are connected for co-rotation. A serpentine thermal conduction path is defined between the first end of the torque tube assembly and the second end of the torque tube assembly, and includes at least a portion of each of the concentric elongate torque tubes.

Abstract: An electrodynamic machine has a winding and a switching arrangement effectively dividing the winding into individually controllable portions. During a first operating condition, current flows through the entire winding in a manner controlled by the switching arrangement. In a second condition, the switching arrangement restricts current flow to only a portion of the winding. The second condition effectively reduces the inductive capacity of the winding.

Abstract: A power turbine speed control system for a turbo-shaft type gas turbine engine that has a gas generator compressor spool and a power turbine spool and drives an electrical generator that powers at least one electrical load by way of at least one electrical bus, comprises a power turbine controller that senses the rotary speed of the power turbine spool and generates at least one signal that changes the torque of the electrical generator in response to the sensed change in the rotary speed of the power turbine spool.

Abstract: A dynamoelectric machine comprises: a stator that comprises a plurality of stator poles arranged around a stator surface of revolution with a stator axis for the stator surface of revolution; at least one rotor that comprises a plurality of permanent rotor magnets arranged around a rotor surface of revolution with a rotor axis for the rotor surface of revolution that is coincident with the stator axis and with the rotor surface of revolution adjacent the stator surface of revolution; a drive shaft with a drive shaft axis of rotation that is substantially coincident with the stator axis coupled to the rotor for rotating the rotor relative to the stator about the drive shaft axis of rotation; and a at least one actuator for axially displacing the rotor surface of revolution along the drive shaft relative to the stator surface of revolution to change magnetic flux interaction between the stator poles and the rotor magnets; wherein at least one of the surfaces of revolution tilts with respect to the drive shaft a

Abstract: A magnetic actuator core is provided for a radial bearing that supports a rotor for rotation about an axis. The magnetic actuator core includes a back iron, and a plurality of poles spaced circumferentially about the axis and extending radially from the back iron. Each of the poles has a taper wherein the circumferential width of the pole tapers from larger to smaller as the pole extends from the back iron.

Abstract: Losses in efficiency of operation of a dynamoelectric machine as a result of eddy current losses and poor coolant efficiency and/or disruption of the magnetic circuit in a rotor by coolant passages is avoided in a dynamoelectric machine including a stator (18) in which a rotor (16) is journaled. The rotor includes a stack (16) of thin laminations (17) made of a ferromagnetic material to define a rotor body. The rotor body includes a plurality of equally angularly spaced poles (58) separated by recesses (64). Coolant passages (76) located in the rotor at or just radially inward of the base (72) of each pole (58) and substantially radially outward of the rotational axis (56) of the rotor (14) to maximize cooling efficiency of the poles (58) without disrupting the magnetic circuit in the rotor. Slots (80) are placed in the tips (70) of the poles (58) of selected laminations (17) and extend generally radially inward to reduce eddy current losses.

Abstract: An electromagnetic thrust bearing having reduced windage losses, improved structural integrity, and enhanced electromagnetic flux density. The present invention provides an electromagnetic thrust bearing having a first annular stator segment and a second annular stator segment joined thereto to define an annular electromagnetic coil chamber having an L-shaped cross-section. By employing first and second stator segments, the electromagnetic coil can be precision wound onto one segment without interference from the other segment, and then the two segments can be joined after the precision winding has been performed. The first segment is joined to the second segment at a location remote from the stator poles to thereby provide a more structurally sound assembly able to better withstand loads imposed thereon. The stator segment pole faces include axially extending lips to maximize electromagnetic flux density and thus load carrying capacity.

Abstract: A magnetic bearing (10) is provided for supporting a rotor (12) for rotation about an axis (14). The magnetic bearing (10) includes a plurality of actuator cores (16) spaced circumferentially about the axis (14), and a plurality of non-magnetic spacers (18A, 18B). Each of the cores (16) has a pair of circumferentially spaced end surfaces (28). Each of the spacers (18A, 18B) is positioned between the end surfaces (28) of adjacent pairs of the cores (16) and has an interference fit with the end surfaces (28) to form a circumferentially preloaded ring (19) of the cores (16) and spacers (18A, 18B) centered on the axis (14). At least one of the non-magnetic spacers is a multi-piece assembly (18A) including a shim (32, 49) having a width selected to provide the circumferential preload within a predetermined range.