By Control Of Excitation Patents (Class 322/6)
  • Publication number: 20080150494
    Abstract: An apparatus and method generate electric current within a specified frequency range from a rotor operating within a broad range of rotational speeds by reducing the number of poles of the generator at higher rotational speeds. At higher rotational speeds, the generator circuit is altered so that a flow of current through half of a plurality of windings is reversed and the polarity in the said half of the windings is reversed. Two adjacent windings with the same polarity create a single pseudo pole, which effectively reduces the number of poles in the generator by half, and reduces the frequency of the electric current produced by the generator. Thus, the generator is operable to produce current within a specified frequency range from a rotor operating within a broad range of rotational speeds.
    Type: Application
    Filed: December 26, 2006
    Publication date: June 26, 2008
    Inventors: Glenn C. Lemmers, Darin R. Morman
  • Patent number: 7071657
    Abstract: A single-pole type generator with low loss magnetic core is excited by a field coil that is part of a low loss series resonant circuit tuned to a desired AC power frequency, which may be frequencies such as 50 Hz or 60 Hz or 400 Hz. The series resonant circuit is excited at the resonant frequency. The resulting resonant behavior of the excitation circuit automatically provides the high driving voltages and sinusoidal energy storage patterns needed to efficiently modulate the magnetic field at the desired power frequency. This modulation of the excitation field is amplified by mechanical power from a rotating shaft and modulates the output current and voltage of a single phase output circuit of the single-pole type generator at that power frequency in a sinusoidal pattern thus delivering alternating current power without any requirement for further electronic rectification, commutation or processing.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: July 4, 2006
    Assignee: Raven Technology, LLC
    Inventors: Christopher N. Tupper, Duncan G. Wood
  • Patent number: 7064526
    Abstract: A permanent magnet starter/generator subsystem configured in a fault tolerant architecture is described herein for small engine applications. The system allows for lighter system weight, improved system reliability, higher performance capability and reduced maintenance.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: June 20, 2006
    Assignee: Astronics Advanced Electronic Systems Corp.
    Inventor: Stanley C. Patterson
  • Patent number: 6337561
    Abstract: A generating system having a rotating type generator to interconnect a power system in order to output power of the generator to the power system comprises a generator, an exciting circuit and an excitation control section. It also comprises short-cycle stabilizing sections for outputting a short-cycle stabilizing signal for suppressing short-cycle power fluctuations according to at least one of an electric parameter and a mechanical parameter of the generator and a long-cycle stabilizing section for outputting a long-cycle stabilizing signal for suppressing long-cycle power fluctuations having a cycle time longer than short-cycle power fluctuations according to the mechanical parameter of the generator. The outputs of the short-cycle stabilizing sections and the long-cycle stabilizing section are sent to the excitation control section.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: January 8, 2002
    Assignees: Chubu Electric Power Co., Inc., Kabushiki Kaisha Toshiba
    Inventors: Yoshinari Sudou, Akira Takeuchi, Yoshinobu Mitani, Mamoru Kawasaki, Mikihito Andou, Kaiichirou Hirayama, Yoichi Uemura, Nobuo Fukushima, Toshiaki Sogabe
  • Patent number: 5656922
    Abstract: A vehicle based AC power system includes a specialized high efficiency vehicle alternator capable of supplying its maximum rated DC output current, even when being driven by an idling vehicle engine, to power a DC to AC inverter and provide maximum rated AC power at any engine speed. The alternator is preferably a wound field and permanent magnet hybrid alternator employing a three state bridge-type voltage regulator. An electrical load monitor electrically connected to monitor the electrical load on the alternator and a transmitter and receiver are used to remotely signal a user whenever there is an excessive load on the system.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: August 12, 1997
    Assignee: Ecoair Corp.
    Inventors: William J. LaVelle, Charles D. Syverson, William P. Curtiss