Techniques are described for using an electrical motor to slow down or stop a propulsor during an operation mode where the engine is to be otherwise running but the speed of the propulsor should be low or the propulsor should be stopped.

An engine system of an aircraft includes an energy storage system, a gas turbine engine, and a controller. The gas turbine engine includes a low spool, a high spool, a low-spool generator operably coupled to the low spool, and a high-spool electric motor operably coupled to the high spool. The controller is configured to detect a braking condition of the aircraft, transfer power from the low-spool generator to the energy storage system based on the storage capacity state of the energy storage system, and transfer power to the high spool through the high-spool electric motor to support combustion in the gas turbine engine while a rotational speed of the low spool is reduced responsive to the low-spool generator extracting energy from the low spool.

A fan motor braking apparatus includes a fan motor, a conversion circuit and a motor driver circuit. The conversion circuit is respectively and electrically connected to the fan motor and the motor driver circuit. The conversion circuit includes bridge structures. After the fan motor starts operating, the motor driver circuit receives at least one fan status signal and determines whether the fan motor braking apparatus enters a braking status or not according to the at least one fan status signal. When the fan motor braking apparatus enters the braking status, the motor driver circuit outputs a braking control signal to the conversion circuit so that the bridge structures of the conversion circuit generate a brake effect on fan motor, wherein the at least one fan status signal includes an external speed-control signal and a transition voltage signal of the fan motor.

A regulation system (20) of an expansion turbine (3) speed, the system having an organic Rankine cycle system (10) in turn having at least one expansion turbine (3), a control unit (21) which manages all the control processes of the regulation system (20), and regulates the frequency of the electrical energy produced by a generator (4) operating according to a predetermined management logic on one or more of the following components: at least one inlet valve (AV), at least one by-pass valve (BV), an electrical accumulation system (22), a dissipative electrical brake (24), a control of interruptible electrical loads (25) or a system for modulating heat generation or recovery, the predetermined management logic includes a primary regulation that takes place within 10 s and a secondary regulation that takes place in a time between 30 seconds and 30 minutes.

An assembly for a gas turbine engine of an aircraft includes a rotational assembly, a starter generator, and a control relay. The starter generator is coupled with the rotational assembly. The starter generator is configured to selectively drive rotation of the rotational assembly. The starter generator includes a motor winding including a first electrical terminal and a second electrical terminal. The control relay includes a switch electrically connected to the first electrical terminal. The switch is positionable in a first contact position and a second contact position, in the first contact position, the first electrical terminal is electrically isolated from the second electrical terminal through the switch. In the second contact position, the first electrical terminal is electrically connected to the second electrical terminal through the switch such that a closed electrical circuit is formed through the motor winding, the first electrical terminal, the second electrical terminal, and the switch.

A fan motor braking apparatus is provided. The fan motor braking apparatus includes a fan motor, a conversion circuit and a motor driver circuit. The conversion circuit is respectively and electrically connected to the fan motor and the motor driver circuit. The conversion circuit includes bridge structures. After the fan motor starts operating, the motor driver circuit receives at least one fan status signal and determines whether the fan motor braking apparatus enters a braking status or not according to the at least one fan status signal. When the fan motor braking apparatus enters the braking status, the motor driver circuit outputs a braking control signal to the conversion circuit so that the bridge structures of the conversion circuit generate a brake effect on fan motor, wherein the at least one fan status signal includes an external speed-control signal and a transition voltage signal of the fan motor.

A method of braking a rotational air mover portion of an aircraft propulsion system is provided. The method includes: using an electrical device to apply a torque to a propulsion unit driven by a propulsion system of an aircraft, the propulsion unit including a rotational air mover configured to provide thrust for propelling the aircraft, wherein the electrical device is configured to produce electrical energy during the process of applying the torque to the propulsion unit; controlling the electrical device to apply an amount of the torque that is sufficient to cause the rotational air mover to decelerate or to maintain the rotational air mover non-rotational; and directing the electrical energy produced by the electrical device to an aircraft component.

Disclosed is a swing angle adjustment device for an electric fan oscillating head, and an electric fan applying same. By means of an arc reinforcing sleeve, in which one end is in sliding fit with a planetary gear addendum-circle surface and the other end is in clearance with a sun gear addendum-circle, being made on the lower end surface of a planet carrier, the swing angle adjustment device which is for an electric fan oscillating head and can prevent a planetary-gear crank from dislocation is constituted; by means of a small-diameter non-involute toothed ratchet wheel and a pawl being arranged on a large, a non-involute toothed ratchet wheel and pawl clutch device is formed, such that the swing angle adjustment device for an electric fan oscillating head is constituted in such a way that the clutch device has no slip under normal conditions; by means of a rotor position sensing signal acquisition device, in which high- and low-voltage elements are isolated from each other, being arranged, on a rotor of an electric motor, to connect to an angle adjustment control chip, a closed-loop electric-control-type swing angle adjustment device, in which angle adjustment is convenient, for an electric fan oscillating head is constituted; and by means of using a screw-free structure and a built-in layout for a bearing sleeve positioning plate, a magnetic attraction brake device, and components that are related to an electrical signal sampling system, the structure of the swing angle adjustment device is compact.

A regulation system (20) of an expansion turbine (3) speed, the system having an organic Rankine cycle system (10) in turn having at least one expansion turbine (3), a control unit (21) which manages all the control processes of the regulation system (20), and regulates the frequency of the electrical energy produced by a generator (4) operating according to a predetermined management logic on one or more of the following components: at least one inlet valve (AV), at least one by-pass valve (BV), an electrical accumulation system (22), a dissipative electrical brake (24), a control of interruptible electrical loads (25) or a system for modulating heat generation or recovery, the predetermined management logic includes a primary regulation that takes place within 10 s and a secondary regulation that takes place in a time between 30 seconds and 30 minutes.

A steam turbine includes a turbine main body having blades supported rotatably, a steam channel which is connected to the turbine main body and in which steam flows, a regulating valve configured to linearly move to adjust opening/closing of the steam channel, and an opening/closing drive mechanism configured to drive the regulating valve. The opening/closing drive mechanism includes an electric motor configured to rotate by an electric power being supplied, a conversion mechanism configured to convert rotational motion of the electric motor into linear motion of the regulating valve, and a brake operated by regenerative energy of the electric motor.