Abstract:
A fuel control system having a combustive energy value evaluator determining a combustive energy value of the fuel, and a controller calculating a desired flow rate based at least on the combustive energy value and controlling a fuel metering device such that the fuel flow rate corresponds to the desired fuel flow rate.
Abstract:
A method and apparatus for starting a gas turbine engine using a brushless sensorless machine, the machine having a rotor and a stator with windings, the method including positioning the rotor at a desired position with respect to the stator and then energizing the windings of the stator.
Abstract:
A method and apparatus for permanent magnetic (PM) rotor crack detection includes a sensor which monitors magnetic flux distribution of the PM rotor and identifies the presence of a crack in the PM rotor when a magnetic flux distribution change or anomaly is detected.
Abstract:
Methods and systems are disclosed for reducing alternating current ripples in direct current electrical power generation systems with one or more regulated permanent magnet machines. Ripple suppression is achieved, in one aspect, by modulating the control current of a regulated permanent magnet machine.
Abstract:
A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The motor drive circuit includes a reconfigurable active snubber. Under given resonance conditions, the active snubber is configured to use a resistive element to dissipate electrical transients across the commutation circuit.
Abstract:
A fuel control system having a combustive energy value evaluator determining a combustive energy value of the fuel, and a controller calculating a desired flow rate based at least on the combustive energy value and controlling a fuel metering device such that the fuel flow rate corresponds to the desired fuel flow rate.
Abstract:
An aircraft electronics housing assembly maintains the electronics unit at given ambient conditions despite changes in conditions outside the housing during the aircraft flight cycle.
Abstract:
An elongated conductive casing is filled with a dielectric material and has an opening at one end. The dielectric material forms a surface across the opening, and a plate member is disposed on the surface to form the sensitive arm of the capacitive probe. Formed within the casing are four capacitors, including the sensitive arm, which form a capacitive probe.
Abstract:
Electric machines comprising a plurality of magnetized rotors, preferably including bi-pole magnets. The rotors are configured to drive and/or be driven by a common shaft, as for example by suitable configurations of gears. The rotors are magnetically indexed, in pairs, with respect to each other and to corresponding electrical windings, such that, when a current is passed through the one or more windings, the rotors provide phased rotary power to the common shaft; or, when torque is applied to the common shaft, a phased electrical output is provided to the windings.
Abstract:
Method and system are disclosed for starting a high voltage engine using a starter permanent magnet motor. The starter motor is powered using a DC power source remote from the starter motor. A bidirectional DC-to-DC converter local to the DC power source is used to produce a variable high voltage variable frequency power for driving the starter motor, and is remotely controlled to produce a controlled output current level. During generate mode the DC-DC converter may be used to charge the battery.