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| Number | Title | Issue Date |
| 7746038 | System and method for suppressing DC link voltage buildup due to generator armature reaction A controller employed in conjunction with a synchronous generator monitors the output voltage of the generator. The controller employs the monitored output voltage as feedback that is used to control the excitation provided to an exciter field winding. In addition, ... | 06/29/2010 |
| 7375499 | Fault tolerant synchronisation source for excitation control of a three phase power generating system A fault-tolerant synchronisation source for excitation control of a three-phase generator system that combines point of regulation (POR) signals representing parameters comprising voltage and current for each phase at the POR to generate a fault-tolerant synchronisa... | 05/20/2008 |
| 7312550 | Architecture for electric machine In one aspect, an alternator is described which includes a current control apparatus including a stator winding and a control winding, wherein current control in the control winding regulates the stator winding. In another aspect, a gas turbine engine includes a mul... | 12/25/2007 |
| 7288923 | Voltage-limited electric machine An electric alternator having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits around different portions of the winding which may be configured relative to one another... | 10/30/2007 |
| 7274865 | General purpose 100% solid state drive for direct current rotary machines General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as mo... | 09/25/2007 |
| 7262539 | Saturation control of electric machine The invention includes an electric alternator/motor having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits, one of which includes a saturable portion in which saturat... | 08/28/2007 |
| 7126313 | Architecture for electric machine The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be us... | 10/24/2006 |
| 7091637 | AC generator for vehicle having rectifying unit An ac generator for a vehicle includes a rotor for providing a magnetic field, a stator having a stator core in which a plurality of phase-windings is mounted to generate electromotive force when the magnetic field is supplied, a rectifying unit which includes posit... | 08/15/2006 |
| 7034509 | Multiple voltage generating There are apparatus and methods for generating a plurality of voltage levels. There is a rotor that includes a first and a second portion of rotor windings. The first portion of rotor windings is constructed and arranged to establish a first magnetic field of a firs... | 04/25/2006 |
| 6969930 | Half-stepping motor with bifilar winding ratio for smooth motion A half-stepping motor with bifilar coil windings about its stator poles has two layers of stator coils with different numbers of turns per pole for each layer. The ratio between the number turns is selected to provide a desired angular phase shift in the torque prof... | 11/29/2005 |
| 6965183 | Architecture for electric machine The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be us... | 11/15/2005 |
| 6960900 | Method and apparatus for starting a gas turbine using a polyphase electric power generator A method to start a combined unit gas turbine and electrical unit having a static start drive including the steps of: applying a variable frequency voltage from the static start drive to a winding of the generator to accelerate the combined unit to a turbine self-su... | 11/01/2005 |
| 6933704 | Slip-inducing rotation starting exciter for turbine generator A dynamoelectric machine combining the functions of an exciter, a turning motor, and a starting motor for a turbine. The machine operates in a first mode where the slip between a first stator winding and a first armature winding is positive and thus the magnetic fie... | 08/23/2005 |
| 6909263 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 06/21/2005 |
| 6906479 | Gas turbine engine starter generator with multiple windings on each exciter stator pole A rotating electrical machine, such as an aircraft starter-generator, includes an exciter that has its stator windings divided into a number of sections. A plurality of switches are electrically coupled to the exciter stator winding sections and are configured and c... | 06/14/2005 |
| 6864667 | Stator winding pattern for reduced magnetic noise An electrical generator having a stator, a rotor, two windings, and a rectifying circuit. The stator has a first winding arranged in a wye configuration and a second winding arranged in a delta configuration. The wye winding is wound in a full pitch pattern around t... | 03/08/2005 |
| 6750636 | Redundant field drive for an electric machine An electric power generating system comprising: a generator including an alternator and regulator, the regulator including a normal field control and a redundant field control with a default field command and a selector for selecting between the normal field control... | 06/15/2004 |
| 6531685 | Separate exciter windings for weld and auxiliary power A method and apparatus for providing power from an engine includes a one or more output windings in of slots on a generator. A plurality of exciter windings are in magnetic communication with the one or more output windings. The exciter windings are also ... | 03/11/2003 |
| 6522106 | Automatic voltage regulating system for engine generator An automatic voltage-regulating system for an engine generator includes an output voltage detecting device for extracting a single-phase AC output voltage from an output winding wound around a stator to output a detection voltage, and a switching device f... | 02/18/2003 |
| 6486640 | Control system for variable frequency generator Disclosed is a control system for a variable frequency generator including a main stator winding for providing a generator output, excited by a main rotor winding, and a main exciter rotor winding for energizing the main rotor winding, excited by a main e... | 11/26/2002 |
| 6188204 | Brushless AC field system for stable frequency variable speed alternators An AC generator whose field winding (4) on the rotor is excited by AC so that the resultant speed of the rotating field is the algebraic sum of the rotor speed and the speed of the field relative to the rotor itself. This makes it possible to generate AC ... | 02/13/2001 |
| 6160384 | Magneto-equipped power device A power device including a magneto and a rectification circuit for rectifying an output of the magneto is provided which is capable of adjusting an output of the magneto without any specific control circuit. A field adjusting excitation coil is arranged o... | 12/12/2000 |
| 5764036 | Multiple output decoupled synchronous generator and electrical system employing same A multiple output synchronous generator in accordance with the instant invention comprises a stator having a first stator winding having a number of poles p and a second stator winding having a number of poles 2*p*n where p and n are any whole numbers, th... | 06/09/1998 |
| 5714821 | Alternating current generator with direct connected exciter winding A three phase four pole alternating current generator includes an AC exciter including a series winding for each phase of the main generator windings and a shunt winding for each of the main phase windings. The series exciter windings includes two coils. ... | 02/03/1998 |
| 5694027 | Three-phase brushless self-excited synchronous generator with no rotor excitation windings On a stator core, there are wound T-connection primary generating windings such that the second and third single-phase windings are respectively arranged at positions electrically orthogonal to the first single-phase winding. The winding number of the fir... | 12/02/1997 |
| 5598091 | Three-phase brushless self-excited synchronous generator with no rotor exciting windings On a stator core, there are wound primary generating windings of four (4) poles with a distributed full-pitch winding structure and stator excitation windings with a concentrated full-pitch winding structure, having the number of poles odd-number times th... | 01/28/1997 |
| 5187426 | Device for limiting the terminal voltage in an alternator An arrangement for limiting the terminal voltage in an alternator has a fixed stator winding acting on rectifiers and an excitation winding which rotates with the alternator rotor. The arrangement also has a controller and a first slip ring contact which ... | 02/16/1993 |
| 5051640 | Heteropolar excited synchronous machine A stator-excited synchronous machine with an unwound, toothed rotor has a stator which is subdivided into sectors each of which is wound with an excitation winding. Permanent magnets are disposed between the stator sectors tangentially. The permanent magn... | 09/24/1991 |
| 4887020 | Self-compensating brushless alternator A self-excited brushless alternator having a rotating field winding excited by an alternating current exciter whose rotating armature rotates with the rotating field winding and is permanently connected to the field winding via a field rectifier also moun... | 12/12/1989 |
| 4871960 | Output voltage control system for an electric generator An output voltage control system for an electric generator having two field windings, wherein a rotary shaft of the generator is rotated by a power source such as an engine, for producing an output voltage. According to the invention, the control system i... | 10/03/1989 |
| 4851758 | Brushless generator A brushless generator having a rotor for generating a magnetic field, a stator having magnetic poles facing the rotor a main generating winding; and a voltage is induced as the magnetic field generated in the rotor intersects the main generating winding, ... | 07/25/1989 |
| 4733157 | Electronic voltage regulator with two-directional action for alternators A voltage regulator supplies excitation current both in addition and in subtraction, since supplied current can vary not only in intensity, but also in direction depending on the signal given by a control device, which regulates the conduction of the regu... | 03/22/1988 |
| 4723106 | Brushless generator exciter using hybrid rectifier A brushless generator exciter employs a hybrid full-wave rectifier in which at least some of the rectifying diodes are controllable according to an external signal for adjusting the total exciter power fed to the generator rotor. An optical transmission t... | 02/02/1988 |
| 4663582 | Self-excited generator A stator is formed with two opposed magnetic poles, and first and second magnetic paths juxtaposed to each other. An output coil and a first exciting coil are wound on the first magnetic path in such a manner as to produce respective electromagnetic force... | 05/05/1987 |
| 4633160 | Self-excited alternator A self-excited brushless alternator having a rotating field excited by an alternating current exciter whose armature rotates with the field winding of the alternator and is permanently connected to that winding by a rotating field rectifier. To obtain rel... | 12/30/1986 |
| 4467267 | Alternator excitation system An excitation system for a brushless synchronous alternator includes an exciter having a stator which includes first and second sets of field coils respectively coupled to a source of DC power and in series with polyphase AC output current developed by th... | 08/21/1984 |
| 4424478 | Device for exciting master generator of self-contained power units for transportation facilities A device for exciting a master generator of self-contained power units for transportation facilities comprises a master generator with a first excitation winding, an auxiliary exciter generator with a second excitation winding, an exciting current regulat... | 01/03/1984 |
| 4408152 | Single phase, self-regulated alternator A substantially constant frequency self-regulated generator produces in one embodiment 120 volts or the like single phase output or in another embodiment 120 or 240 volts or the like single phase output. The generator employs an exciter stator and a stati... | 10/04/1983 |
| 4383213 | Triodyne A dynamoelectric machine having a multiple of three poles and a corresponding multiple of three brushes is disclosed. Each of the poles are wound poles, two of each group of three poles being excited with a constant excitation during normal operation, the... | 05/10/1983 |
| 4383215 | Direct-current, self-contained, mobile power supply system To prevent over-excitation upon high-speed operation of a compound wound alternator, the shunt field, connected in standard manner to a voltage regulator, has an additional shunt field winding placed on the core, the additional shunt field winding being c... | 05/10/1983 |
