Unidirectionally Conductive Patents (Class 322/79)
  • Patent number: 10020763
    Abstract: A power generation system is provided in which, when a static frequency converter (SFC) is connected to synchronous generator's armature windings, an AC exciter performs AC excitation by allowing a d-axis winding and a q-axis winding of the AC exciter to configure d-q orthogonal axes; and, at the time of steady-state operation of the synchronous generator, an alternating current(s) supplied from an electric power source is rectified by a thyristor excitation device, and also the AC exciter thereby performs DC excitation by connecting the d-axis winding and the q-axis winding in series with each other.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: July 10, 2018
    Inventors: Akiko Tabuchi, Toshiyuki Fujii, Ryota Onishi, Shinya Noguchi, Ryoji Miyatake
  • Patent number: 8928293
    Abstract: An electrical machine includes a stator having a main armature winding, an exciter field winding, and a transformer primary winding. A rotor is operatively connected to rotate relative to the stator, wherein the rotor includes an exciter armature winding operatively connected to the exciter armature winding for field excitation therebetween, a main field winding operatively connected to the main armature winding for field excitation therebetween, and a transformer secondary winding operatively connected to the transformer primary winding to form a rotating transformer. A generator control unit is operatively connected to the main armature winding, exciter field winding, and transformer primary winding to control the main armature and exciter field windings based on excitation in the primary winding received from the transformer secondary winding.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: January 6, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Jacek F. Gieras, Steven J. Moss
  • Publication number: 20150002106
    Abstract: According to one embodiment, there is provided a generator excitation apparatus including a plurality of first power converters and a second power converter. The plurality of first power converters are electrically connected to windings of respective phases of rotors of a wound rotor type induction generator in which the windings of the rotors of the respective phases are electrically independent, and are configured to bidirectionally convert DC and AC. The second power converter is configured to bidirectionally convert DC and AC between DC sides of the first power converters and a three-phase DC power supply. The DC sides of the first power converters are electrically connected together to a DC side of the second power converter.
    Type: Application
    Filed: June 25, 2014
    Publication date: January 1, 2015
    Inventors: Katsuhisa INAGAKI, Kentaro SUZUKI, Ryuta HASEGAWA, Teruyuki ISHIZUKI, Kiyoshi KUSUNOKI
  • Publication number: 20100134074
    Abstract: An exciter assembly for supplying a field current to the rotor windings of a superconducting synchronous machine includes a pulse transformer having a stationary primary winding and a secondary winding that is mounted to the rotor of the superconducting synchronous machine for rotation therewith. A switched mode power supply supplies a pulsed voltage to the primary winding of the pulse transformer. The pulsed voltage developed at the secondary winding of the pulse transformer is supplied to the rotor windings through a rectifier semiconductor device and a pair of transfer leads. The rotor windings and a flywheel semiconductor device are located inside a cryogenic chamber or cryostat. The flywheel semiconductor device is connected in parallel with the rotor windings and operates in unison with the rectifier semiconductor device in order to provide synchronous rectification of the switched mode power supply output.
    Type: Application
    Filed: February 13, 2006
    Publication date: June 3, 2010
    Inventor: Allan David Crane