Electricity: single generator systems inventions

20090267572 - Current limitation for a double-fed asynchronous machine: In a method and an apparatus for controlling the output or drawn active and reactive power of a double-fed asynchronous machine (5), the maintenance of a maximum permissible current (16) of the machine—without the use of a subordinate current controller—is ensured by virtue of the fact that, during the operation... Agent: Henry M Feiereisen, LLC Henry M Feiereisen

20090256532 - Kinetic energy harvesting in a drill string: An apparatus and method for harvesting energy in a wellbore is disclosed. In one embodiment, a harvester tool positioned in a wellbore for capturing energy in the wellbore is disclosed. The harvester tool includes a rotor comprising a magnet. The magnet is disposed eccentric to a center of the harvester... Agent: Schlumberger Oilfield Services

20090251109 - Systems and methods involving starting variable speed generators: An exemplary method for starting a generator, the method comprising, starting a rotor with an AC voltage across the rotor. Starting a stator. Increasing a speed of the rotor.... Agent: Cantor Colburn, LLP

20090251110 - Method and apparatus for controlling electric power generation for vehicles: The present invention provides, as one aspect, an apparatus for controlling electric power generation for vehicles, which controls energization of an excitation winding of a generator driven by an internal-combustion engine controlled by a controller to control output voltage of the generator. The apparatus includes a restraining unit that restrains... Agent: Oliff & Berridge, PLC

20090251111 - Static compensator apparatus for hvdc system: A static compensator apparatus for a HVDC system may control harmonic wave compensation at high passive speed to meet operating characteristics of the HVDC system. A static compensator is turned-on in a normal mode and compensates for invalid power and removes a harmonic wave generated by the high voltage direct... Agent: Kenyon & Kenyon LLP

20090251112 - Permanent magnet electric generator with variable magnet flux excitation: A permanent magnet (PM) electric generator with directly controllable field excitation control comprises: a drive shaft; a PM rotor assembly with multiple PMs arranged around an outer axial periphery of the rotor assembly; a stator assembly comprising a ferromagnetic stator yoke, multiple ferromagnetic stator teeth mounted to the stator yoke... Agent: Stephen George Mican

20090251113 - Cordless power transfer: A system for cordless transfer of power for appliances or electronic devices 30 has a power transferring device 80 with a plurality of magnets 52 driven by a motor 70B powered by commercial electric power devices or lines. The power transferring device 80 is positioned below a table or countertop... Agent: David L. King, Sr.