Abrégé

An active transient voltage suppression device is disclosed which may utilize an activation network to turn on a semiconductor switch. The activation network may be triggered based on the rate of change of voltage on the protected input of the device. More than one such device may be cascaded in parallel to increase energy dissipation without device screening and may provide a stable voltage limit over a wide range of operating currents. The device may be tested for open and short failure modes in circuit.

Classes IPC  ?

• H02H 9/04 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de tension

Abrégé

An active transient voltage suppression device is disclosed which may utilize an activation network to turn on a semiconductor switch. The activation network may be triggered based on the rate of change of voltage on the protected input of the device. More than one such device may be cascaded in parallel to increase energy dissipation without device screening and may provide a stable voltage limit over a wide range of operating currents. The device may be tested for open and short failure modes in circuit.

Classes IPC  ?

• H02H 9/00 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion
• H02H 9/04 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de tension

Abrégé

A generator with relatively high (Length/Diameter) aspect ratio, which may be mounted within the rotating mast of a helicopter, and which may generate power that is conditioned by a rotating power conditioning unit and delivered to the rotating rotor blades without the use of slip rings, is disclosed. The generator may be arranged to take advantage of the available space within the mast. Temperature of the mast and generator may be controlled by varying the wall thickness of the mast wall and using cooling fins on the mast and a cooling dome.

Classes IPC  ?

• B64D 15/12 - Dégivrage ou antigivre des surfaces externes des aéronefs par chauffage électrique

Abrégé

An integrated starter-generator (ISG) utilizes a dedicated, properly sized start box for the starting function, and a fully controllable hybrid homopolar machine with a generator control unit (GCU) for the generate function. The hybrid homopolar machine may comprise a permanent magnet (PM) section that is supplemented by a homopolar field section, which results in a regulated output voltage by either boosting or bucking the voltage out of the PM section vectorially through a common stator.

Classes IPC  ?

• H02K 31/00 - Moteurs ou génératrices acycliques, c.-à-d. machines à courant continu avec des induits en tambour ou à disque, avec captation de courant continue
• H02K 21/04 - Bobinages disposés sur les aimants pour une excitation additionnelle
• H02P 9/30 - Dispositions pour la commande de génératrices électriques de façon à obtenir les caractéristiques désirées à la sortie par variation du champ utilisant des tubes à décharge ou des dispositifs à semi-conducteurs utilisant des dispositifs à semi-conducteurs

Produits et services

Electrical diagnostic equipment; electrical diagnostic equipment, namely, current sensors, current guns, gaussmeters, transducers, current probes, multimeters, and hall generators for measuring electrical current flow.

Abrégé

A generator arrangement is provided in which the functionality of two typically separate electrical power generators are combined together into a single generator that forms part of a three-in-one combined multi-generator which has a dual drive path with a shear section that immunizes one of the generators (e.g., the permanent magnet generator) within the single combined multi-generator from a failure of another generator (e.g., the main generator) within the single combined multi-generator.

Classes IPC  ?

• H02K 7/06 - Moyens de transformation d'un mouvement alternatif en un mouvement circulaire ou vice versa
• H02K 7/20 - Association structurelle à des machines dynamo-électriques auxiliaires, p. ex. à des moteurs électriques de lancement ou des excitatrices
• H02K 16/00 - Machines avec plus d'un rotor ou d'un stator
• H02K 23/60 - Moteurs ou génératrices à induits tournants et champ inducteur tournant

Produits et services

TRANSFORMERS (FIXED AND VARIABLE RATIO), REACTORS, COILS, MAGNETIC AMPLIFIERS, POWER SUPPLIES (WITH ELECTRONIC AND ELECTROMECHANICAL RECTIFIERS), CHOPPERS, SILICON CONTROLLED RECTIFIERS, LIGHT DIMMERS, AND ELECTRICAL RESISTANCES; RATIO METERING DEVICES