Fault-tolerant radial flux rotary electric machines are provided. One such machine comprises: a permanent magnet rotor having fourteen poles; and an alternate-wound stator having sixteen slots and four coil pairs, each coil pair forming part of one of four independent electrical phases.

The present disclosure provides an electrical generator within an engine that includes a permanent magnet that emits a first magnetic field and is disposed on a first shaft; a first winding connected to a second shaft such that the first winding is positioned within the first magnetic field; a field winding disposed on the second shaft such that the field winding generates a second magnetic field that rotates as first shaft rotates relative to the second shaft; a second winding disposed on the first shaft, the second winding being positioned to receive the second magnetic field and provide a resonant emitter with an electrical power input to generate a third magnetic field when the first shaft rotates relative to the second shaft; and a resonant receiver disposed on an enclosure of the engine, positioned to receive the third magnetic field and convert the third magnetic field into an electrical output.

The present disclosure provides an electrical generator within an engine that includes a permanent magnet that emits a first magnetic field and is disposed on a first shaft; a first winding connected to a second shaft such that the first winding is positioned within the first magnetic field; a field winding disposed on the second shaft such that the field winding generates a second magnetic field that rotates as first shaft rotates relative to the second shaft; a second winding disposed on the first shaft, the second winding being positioned to receive the second magnetic field and provide a resonant emitter with an electrical power input to generate a third magnetic field when the first shaft rotates relative to the second shaft; and a resonant receiver disposed on an enclosure of the engine, positioned to receive the third magnetic field and convert the third magnetic field into an electrical output.

Methods and systems for operating a hybrid electric aircraft propulsion system. The method comprises providing alternating current (AC) electric power to a first electric motor to drive a first rotating propulsor, providing the first electric motor with AC electric power from at least one motor inverter operatively coupled to a direct current (DC) power source, detecting a failure in a path to the first electric motor, and selectively rearranging a first switching arrangement between the generator, the at least one motor inverter, and the first electric motor.

Hydraulic fracturing systems and methods that are configured for enhanced mobility. The hydraulic fracturing systems and methods utilize power supply components, power generating devices, and electrically powered devices that are relatively small and lightweight, thereby making the systems they are used in more easily transportable without sacrificing system performance when delivering pressurized fracturing fluid to one or more wellbores. Due to their relatively small size, the hydraulic fracturing systems may require less maintenance and may therefore be relatively inexpensive to own and operate.

A terminal lead support for use in an integrated drive generator has a body defining an outer end extending to two outer angled surfaces. The outer angled surfaces each extend to curved end portions. The curved end portions connect the outer angled surfaces into inner angled surfaces. The inner angled surfaces each extend into cupped portions formed about a radius. There are six apertures formed within the body, with laterally outer apertures spaced from the outer surface by a greater amount than laterally intermediate apertures. The laterally intermediate apertures are spaced from the outer surface by a greater amount than laterally inner apertures. An integrated drive generator and a method of replacing a terminal lead support are also disclosed.

Apparatus and methods for recovering energy in a petroleum, petrochemical, or chemical plant as described. The apparatus includes a fluid process stream flowing through a petroleum, petrochemical, or chemical process zone. There are at least one variable-resistance power-recovery turbine, a portion of the first process stream flowing through the first power-recovery turbine to generate electric power as direct current therefrom. There is a single DC to AC inverter electrically connected to at least one power-recovery turbine, and the output of the DC to AC inverter electrically connected to a first substation.

A system can include a first generator configured to operate in a first speed range to produce a predetermined output characteristic, a second generator configured to operate at a second speed range different from the first speed range to produce the predetermined output characteristic, and a controller configured to activate the first generator at and/or above a first low activation speed and at and/or below a first high activation speed within the first speed range. The controller can be configured to activate the second generator at and/or above a second low activation speed within the second speed range. The controller can be configured to deactivate the first generator at and/or above a first high deactivation speed. The controller can be configured to deactivate the second generator at and/or below a second low deactivation speed.

A power generation system includes one or more micro-turbine electric generators (MTEGs). The MTEGs include a housing having an inlet for receiving pressurized gas and an outlet for releasing expanded gas. The MTEGs also include a rotor, a user-replaceable nozzle for directing pressurized gas over blades of the rotor, and a stator for generating alternating current (AC) responsive to rotation of the rotor. The power generation system also includes a programmable logic controller (PLC) coupled to the MTEGs that operates flow control valves (FCVs) coupled to the MTEGs to modulate the flow of gas to the MTEGs to generate output power suitable to support an electrical load. The system also includes power conversion circuitry configured to convert AC generated by the MTEGs to direct current (DC) and to provide the DC to an electrical load. The system also includes a skid for mounting multiple and MTEGs and FCVs.

A gas turbine engine comprises an electronic control unit adapted to control functions of the gas turbine engine and having a DC power input unit coupled to receive DC supply power and an ignition igniter coupled thereto. The ignition exciter includes an AC power input unit adapted to receive AC power from an AC power source within the gas turbine engine, a power rectification unit coupled to receive the AC power from the AC power source and configured, upon receipt thereof, to rectify the AC power into DC power, and a DC power output unit coupled to receive the DC power from the power rectification unit and configured to supply the DC power to the DC power input unit of the electronic control unit as DC supply power and/or the ignition igniter.