By Armature Circuit Impedance Patents (Class 322/95)
  • Publication number: 20110050184
    Abstract: An active rectifier controller decouples measurements of the phase and speed of a variable frequency synchronous generator from measurements of the AC output voltage. The active rectifier controller receives position information representative of the rotor position of the VFSG independent of a load connected to the VFSG that is used to determine the phase position and speed of the VFSG. Based on measurements of the generator speed and phase, the active rectifier controller controls the active rectifier to draw AC currents in-phase with the back-electromotive force (BEMF) voltage of the VFSG.
    Type: Application
    Filed: August 28, 2009
    Publication date: March 3, 2011
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Waleed M. Said, Si Jian Fang
  • Publication number: 20100039077
    Abstract: Apparatus for measuring load angle in a synchronous generator is disclosed. The synchronous generator is of a type comprising a main machine, an exciter for exciting the main machine, and a permanent magnet machine for exciting the exciter. The apparatus comprises means for sensing a waveform produced by the permanent magnet machine, means for sensing a waveform produced by the main machine, and means (20) for comparing the waveform produced by the permanent magnet machine with the waveform produced by the main machine to produce a measure of load angle. The measure of load angle may be used to provide a warning of potential pole slip.
    Type: Application
    Filed: February 7, 2008
    Publication date: February 18, 2010
    Applicant: CUMMINS GENERATOR TECHNOLOGIES LIMITED
    Inventor: Denis Hedley Dalby
  • Patent number: 7292010
    Abstract: A new methodology for dealing with the Electric-Magnetic Anti-skid Braking System (EMABS) and recycling the regenerating energy on braking is proposed. Developing a dynamic damper which comprising positive and negative type resistors connected in series becomes a fast switch with adaptation, attenuation and fast recovery system properties, is a crucial turnkey. For braking purpose, the most general configuration is to couple the fast switches to the stator and rotor coils in an AC alternator that is driven by the vehicle's wheels or propellers. After performing the dynamic impedance matching in this braking system, the EMABS effect and recycling of the regenerating energy on braking are accordingly obtained.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: November 6, 2007
    Inventors: Yen-Weay Hsu, Tsun-Cheng Lin, Jiunn-Huei Chen, Ying-Yin Ting
  • Patent number: 7268522
    Abstract: A wound field synchronous (WFS) dynamoelectric machine comprises: a rotor assembly; an exciter generator section comprising a stationary multiphase exciter stator winding for receiving excitation power from a multiphase alternating current (AC) source to generate an exciter stator magnetic field, a multiphase exciter rotor winding in the rotor assembly for generating multiphase AC excitation power as it cuts through the exciter stator magnetic field and a rotating rectifier assembly in the rotor assembly for converting the multiphase AC excitation power to direct current (DC) excitation power; a synchronous machine section comprising a DC main rotor winding in the rotor assembly for generating a main rotor magnetic field and a stationary multiphase main stator winding for receiving a multiphase AC control signal to generate a rotating main stator magnetic field that interacts with the main rotor magnetic field to rotate the rotor assembly; and an impedance that selectively connects one phase of the exciter st
    Type: Grant
    Filed: May 20, 2006
    Date of Patent: September 11, 2007
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Donal E. Baker
  • Patent number: 7245112
    Abstract: There is provided an energy discharge apparatus for dissipating a quantity of stored magnetic energy in a generator field coil of a brushless generator. The apparatus includes an exciter regulator responsive to an output signal of the generator and which provides an exciter field signal, and an exciter field coil responsive to the exciter field signal and which provides an exciter magnetic field, and an exciter armature coil responsive to the exciter magnetic field and which provides an exciter armature signal. The apparatus further includes a control circuit responsive to the exciter armature signal, and a variable impedance in series with the generator field coil and responsive to the control circuit. The variable impedance serves to dissipate the quantity of stored magnetic energy. In another embodiment the apparatus includes a positive feedback circuit responsive to the exciter armature signal and operable to dissipate the quantity of stored magnetic energy.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: July 17, 2007
    Assignee: Teleflex Canada Incorporated
    Inventors: Aleks Velhner, Neil Garfield Allyn, Terry Moreau
  • Patent number: 7161330
    Abstract: There is provided an energy discharge apparatus for dissipating a quantity of stored magnetic energy in a generator field coil of a brushless generator. The apparatus includes an exciter regulator responsive to an output signal of the generator and which provides an exciter field signal, and an exciter field coil responsive to the exciter field signal and which provides an exciter magnetic field, and an exciter armature coil responsive to the exciter magnetic field and which provides an exciter armature signal. The apparatus further includes a control circuit responsive to the exciter armature signal, and a variable impedance in series with the generator field coil and responsive to the control circuit. The variable impedance serves to dissipate the quantity of stored magnetic energy. In another embodiment the apparatus includes a positive feedback circuit responsive to the exciter armature signal and operable to dissipate the quantity of stored magnetic energy.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: January 9, 2007
    Assignee: Teleflex Canada Incorporated
    Inventors: Aleks Velhner, Neil Garfield Allyn, Terry Moreau
  • Patent number: 7154249
    Abstract: There is provided an energy discharge apparatus for dissipating a quantity of stored magnetic energy in a generator field coil of a brushless generator. The apparatus includes an exciter regulator responsive to an output signal of the generator and which provides an exciter field signal, and an exciter field coil responsive to the exciter field signal and which provides an exciter magnetic field, and an exciter armature coil responsive to the exciter magnetic field and which provides an exciter armature signal. The apparatus further includes a control circuit responsive to the exciter armature signal, and a variable impedance in series with the generator field coil and responsive to the control circuit. The variable impedance serves to dissipate the quantity of stored magnetic energy. In another embodiment the apparatus includes a positive feedback circuit responsive to the exciter armature signal and operable to dissipate the quantity of stored magnetic energy.
    Type: Grant
    Filed: February 17, 2005
    Date of Patent: December 26, 2006
    Assignee: Teleflex Canada Incorporated
    Inventors: Aleks Velhner, Neil Garfield Allyn, Terry Moreau
  • Patent number: 6310405
    Abstract: A non-directional frequency generator spark prevention apparatus including a plurality of electric connections connected with a direct current power source, i.e., brushes, and a commutator for converting direct current waveform inputted through the brushes into alternating current waveform by rotational movement thereof, and for outputting the alternating current waveform. A voltage pulse controlling part is connected between the brushes of the non-directional frequency generator, while having a resistor and a transistor which are connected in series with each other, and the transistor is operated synchronously with the rotation of the commutator of the non-directional frequency generator. By controlling the electric current to flow through the transistor during the brush-off period, a spark production during the brush-off period can be prevented.
    Type: Grant
    Filed: February 10, 2000
    Date of Patent: October 30, 2001
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-woon Han, Seong-deog Jang, Kwang-seok Kang, Han-jun Sung
  • Patent number: 6066941
    Abstract: A method and apparatus for controlling AC power from the stator of an alternator in which groups of windings have various numbers of turns and various numbers of poles per winding can be connected in series to achieve optimum power generation at one RPM and in parallel to achieve optimum power generation at another RPM.
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: May 23, 2000
    Assignee: Outboard Marine Corporation
    Inventor: Michael J. French
  • Patent number: 5705918
    Abstract: A switched reluctance generator is controlled such that flux growth in a phase winding occurs at a faster rate during the initial part of the phase inductance cycle and at a second, slower rate during the subsequent part of the phase inductance cycle. The difference between flux growth and decay may be achieved either by applying different voltages during the two parts of the phase inductance cycle or by applying the same voltage over only part of the phase winding during the initial part of the phase inductance cycle and then applying that voltage across the phase winding thereafter. It is advantageous to make the increase in flux more rapid than its decay because minimizing the length of time that the flux is present while the phase inductance is rising will minimize the production of unwanted (motoring) torque.
    Type: Grant
    Filed: August 4, 1995
    Date of Patent: January 6, 1998
    Assignee: Switched Reluctance Drives, Ltd.
    Inventor: Rex M. Davis
  • Patent number: 5172046
    Abstract: An electric generator is provided including a rotor having a surface with permanent magnets disposed thereon. A stator is provided having an electrical winding wound thereon in grooves in the stator. An air gap is disposed between the stator and rotor. The electrical winding of the stator is connected to a variable inductance. The value of the variable inductance is controlled by a control stage. The output of the variable inductance is connected to a rectifier which feeds direct electrical current to a current accumulator device, for example, a storage battery. The variable inductance is controlled by the control circuit such that the electrical current from the electric generator is maintained substantially constant for a particular load by the adjustment of the inductance of the variable inductance.
    Type: Grant
    Filed: August 9, 1991
    Date of Patent: December 15, 1992
    Assignee: Fag Kugelfischer Georg Schafer
    Inventors: Adam Dittner, Norbert Oberlack
  • Patent number: 5039933
    Abstract: An induction generator is disclosed wherein both the stator and rotor windings are utilized to generate power with the three phase winding of the stator and rotor each connected in parallel with a delta connected capacitive network connected therebetween. The electrical output may thus be increased by a factor of four over a conventional generator of the same size.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: August 13, 1991
    Assignee: John Dong
    Inventor: Jilan Dong
  • Patent number: 4786853
    Abstract: A brushless capacitor excited alternator includes a rotor assembly having a coil and a diode connected in series with the coil. A stator contains the output coil of the alternator. Also wound on the stator are primary and auxiliary excitation coils. An excitation capacitor is provided with means for connecting it between various terminals on the primary and auxiliary excitation coils, and for connecting the two coils together. The magnetic field and thus the output voltage of the alternator may be varied by connecting the capacitor to different coil terminals.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: November 22, 1988
    Assignee: Kohler Co.
    Inventor: Richard D. VanMaaren
  • Patent number: 4677364
    Abstract: The reactive power of an induction machine is compensated by providing fixed capacitors on each phase line for the minimum compensation required, sensing the current on one line at the time its voltage crosses zero to determine the actual compensation required for each phase, and selecting switched capacitors on each line to provide the balance of the compensation required.
    Type: Grant
    Filed: January 4, 1985
    Date of Patent: June 30, 1987
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Timothy J. Williams, Mohamed A. El-Sharkawi, Subrahmanyam S. Venkata
  • Patent number: 4489290
    Abstract: The output of an electrical generator driven by a meter is coupled to a load through circuitry for limiting the reflected forces placed on the meter.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: December 18, 1984
    Assignee: The Singer Company
    Inventor: Richard C. Warner
  • Patent number: 4473792
    Abstract: A coupling system for an induction motor type generator (10) to an A.C. power line (18) wherein an electronic switch means (28) which is controlled by a control system (30) is regulated to turn "on" at a relatively late point in each half cycle of its operation whereby the energizing power supplied by the line (18) to the induction motor type generator (10) is decreased and the net power delivered to the line is increased.
    Type: Grant
    Filed: March 31, 1983
    Date of Patent: September 25, 1984
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Frank J. Nola
  • Patent number: 4449090
    Abstract: A vehicle generator is provided with a noise reduction apparatus in the form of an inductor coil wound about a plate connecting an output capacitor to an output terminal.
    Type: Grant
    Filed: September 16, 1982
    Date of Patent: May 15, 1984
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hitoshi Gotoh
  • Patent number: 4419618
    Abstract: To utilize the full power capacity of alternators 1, the alternator phases are connected through a transformer 9 to the rectifier 4 which provides rectified output to a battery 8. The transformer 9 has tapped windings, the taps being placed in circuit with the alternator-rectifier network in dependence on a speed control signal, for example derived from the frequency of the alternator, to effect tap changing and matching of the internal impedance of the alternator 1 to the battery 8/load L combination. In accordance with one feature (FIGS. 2, 3), the taps are on the primary, and a-c switches such as triacs 15 are selectively energized as the speed of the generator changes; in accordance with another embodiment (FIGS. 4, 5), the taps are on the secondary of the transformer, and unilaterally conductive switches, such as thyristors or SCRs 48, can be used, in parallel with the rectifier diodes 47 of the rectifying array, and selectively fired as a function of speed.
    Type: Grant
    Filed: October 22, 1981
    Date of Patent: December 6, 1983
    Assignee: Robert Bosch GmbH
    Inventor: Ralf Gretsch
  • Patent number: 4417195
    Abstract: The laminated stator core for an engine ignition system includes in addition to that ignition system an arrangement for charging the storage battery of an internal combustion engine powered device during engine operation with a charging coil surrounding one leg of the ignition stator core, a capacitor in parallel with the coil, and a rectifier coupled to the charging coil for conveying a varying unidirectional current to the battery. The ignition system may be of the type having a three legged E-shaped laminated stator core and a flywheel supported permanent magnet with charging coils being positioned on each of the outer E legs with diodes in series with each charging coil and means connecting the two coil-diode series circuits in parallel with one another and to the battery for providing a pair of sequential primary charging current pulses to the battery during each revolution of the flywheel. A fourth laminated stator core leg supporting a charging coil may be employed in some circumstances.
    Type: Grant
    Filed: November 24, 1982
    Date of Patent: November 22, 1983
    Assignee: Tecumseh Products Company
    Inventor: John N. MacLeod
  • Patent number: 4417194
    Abstract: An electric power generator system including a switched capacitor controlled induction generator adapted to provide power at a regulated voltage and frequency. The system is adapted for autonomous operation for delivery of power with unity power factor to an external power grid.
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: November 22, 1983
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: William P. Curtiss, Donald E. Fulton
  • Patent number: 4388585
    Abstract: A power generating system for adjustably coupling an induction motor, as a generator, to an A.C. power line wherein the motor and power line are connected through a triac. The triac is regulated to normally turn "on" at a relatively late point in each half cycle of its operation, whereby at less than operating speed, and thus when the induction motor functions as a motor rather than as a generator, power consumption from the line is substantially reduced.
    Type: Grant
    Filed: March 16, 1981
    Date of Patent: June 14, 1983
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Frank J. Nola
  • Patent number: 4383214
    Abstract: The laminating stator core for an engine ignition system includes in addition to that ignition system an arrangement for charging the storage battery of an internal combustion engine powered device during engine operation with a charging coil surrounding one leg of the ignition stator core, a capacitor in parallel with the coil, and a rectifier coupled to the charging coil for conveying a varying unidirectional current to the battery. The ignition system may be of the type having a three legged E-shaped laminated stator core and a flywheel supported permanent magnet with charging coils being positioned on each of the outer E legs with diodes in series with each charging coil and means connecting the two coil-diode series circuits in parallel with one another and to the battery for providing a pair of sequential primary charging current pulses to the battery during each revolution of the flywheel. A fourth laminated stator core leg supporting a charging coil may be employed in some circumstances.
    Type: Grant
    Filed: September 25, 1980
    Date of Patent: May 10, 1983
    Assignee: Tecumseh Products Company
    Inventor: John N. MacLeod
  • Patent number: 4378587
    Abstract: Disclosed is a frequency converter system for altering the frequency of a-c power supplied from a distribution network to a load, the system including a pair of mechanically coupled rotating alternating current machines, the alteration of the rate and direction of rotation of the prime mover altering the frequency of the power. A variable impedance network comprising saturable core reactors and connected in the rotor circuit of the prime mover is utilized to effect the change of rate and direction of prime mover rotation.
    Type: Grant
    Filed: October 31, 1980
    Date of Patent: March 29, 1983
    Assignee: ESCO Manufacturing Company
    Inventors: James E. McClain, Howard L. Scott
  • Patent number: 4354150
    Abstract: A slip ring less, three-phase, AC generator especially for motor vehicles, in which the compound winding is subdivided into individual components which are directly interconnected within the branches of the rectifier bridge supplying direct current for the on-board electrical system so that the voltage drop across the compound winding is sensed and compensated by the regulator. The compound winding can be wound of wire having a small diameter.
    Type: Grant
    Filed: April 16, 1980
    Date of Patent: October 12, 1982
    Assignee: Robert Bosch GmbH
    Inventor: Wolfgang Kofink
  • Patent number: 4344027
    Abstract: The present invention is directed to a novel frequency regulator which controls a generator output frequency for variations in both the input power to the generator and the power supplied to an uncontrolled external load. The present invention further includes over current and current balance protection devices which are relatively inexpensive to manufacture, which may be encapsulated to provide protection from the operating environment and which respond more quickly than previously known electromechanical devices.
    Type: Grant
    Filed: February 7, 1980
    Date of Patent: August 10, 1982
    Inventor: Robert F. Karlicek
  • Patent number: 4341989
    Abstract: The invention relates to a device for phase compensation and excitation of a multiphase asynchronous machine, especially one to be driven as a generator and to be operated at low speed. Each winding (1 to 3) in the machine is connected in series or in parallel with a capacitive element consisting of a bank of capacitors (4 to 6) having at least one pair of series connected electrolytic capacitors (7, 8), having in each pair equal terminals interconnected.
    Type: Grant
    Filed: February 26, 1980
    Date of Patent: July 27, 1982
    Assignee: Elmekano i Lulea AB
    Inventors: Torvald Sandberg, Stig Forsberg
  • Patent number: 4296368
    Abstract: In an internal combustion engine driven generator in which a capacitor excitation type synchronous generator is driven by an internal combustion engine, the internal combustion engine has a characteristic that the revolution per minute thereof is increased with a decreasing load applied thereto, and the generator has a characteristic that the output voltage thereof is decreased with a decreasing load current with the revolution per minute maintained unchanged.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: October 20, 1981
    Assignee: Kokusan Denki Co., Ltd.
    Inventor: Masaaki Kubo
  • Patent number: 4246532
    Abstract: This invention relates to a synchronous generator comprising a stator having output winding means connected to a load or loads and main voltage building up means including capacitor means and capacitor exciting winding means, said capacitor means being connected across said capacitor exciting winding means, said output winding means and said capacitor exciting winding means being provided on a common core; and a rotor having field winding means across which a rectifier means is connected; wherein said synchronous generator further comprises auxiliary voltage building up means provided in said stator, said auxiliary voltage building up means causing the output winding means to provide said stator with armature reaction when initial large current has flowed through said auxiliary voltage building up means from said output winding means to thereby build up output voltage across said output winding means with the start of said generator.
    Type: Grant
    Filed: April 6, 1979
    Date of Patent: January 20, 1981
    Assignee: Kokusan Denki Co., Ltd.
    Inventor: Masaaki Kubo
  • Patent number: 4242628
    Abstract: A wind turbine drives the squirrel-cage rotor of a capacitively excited induction generator. The amount of excitation is controlled in accordance with the output voltage of the stator and hence the speed of the wind turbine. The generating system is capable of operating at high efficiency over a wide speed range, since the electrical output frequency is allowed to vary with the rotor speed. The electrical power supplied by the induction generator is used for heating purposes within a nearby building.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: December 30, 1980
    Assignee: The Regents of the University of Minnesota
    Inventors: Narendra Mohan, Mahmoud Riaz