Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8164312 | Reduction in generator-sourced fault current contribution An approach for reduction in generator-sourced fault current contribution is disclosed. In one aspect, automatic excitation control of a generator is coordinated with a generator step-up transformer operating on maximized tap selection to reduce generator fault curr... | 04/24/2012 |
| 8164311 | Control device for electric rotating machine A control device has a unit for selecting each of states of an inverter applying a voltage to a generator, a unit for predicting a first current of the generator, flowing at a second time elapsed by one control period from a first time, from a detected current and t... | 04/24/2012 |
| 8154260 | Generating system Within generator systems maintenance of stability in terms of voltage is desirable. Generally, several generators will be arranged in parallel within the generator system with one generator voltage controlled to provide dynamic responsiveness to load switching. With... | 04/10/2012 |
| 8040113 | Fault tolerant generator or starter/generator with low torque ripple A fault tolerant generator apparatus includes subsystems isolated from each other, so that the generator may operate in a fault mode with low torque ripple. The apparatus comprises a machine and a power controller unit. In an embodiment, the machine has a plurality ... | 10/18/2011 |
| 7990114 | Overload control of an electric power generation system A control system for an electrical power generation system (EPGS) provides overload protection without disconnecting a generator of the EPGS from an excessive electrical load. Available engine power and current levels of the electrical load are continuously measured... | 08/02/2011 |
| 7965063 | Inverter generator In an inverter generator having an engine generator unit, a converter that converts generated alternating current to direct current, an inverter that converts the direct current to alternating current with switching elements to supply to an electrical load, an inver... | 06/21/2011 |
| 7944184 | 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 har... | 05/17/2011 |
| 7863867 | Overload control of an electric power generation system A control system for an electrical power generation system (EPGS) provides overload protection without disconnecting a generator of the EPGS from an excessive electrical load. Available engine power and current levels of the electrical load are continuously measured... | 01/04/2011 |
| 7728561 | Apparatus for controlling power generation for vehicle An apparatus for controlling generation of power to be generated by a generator driven by an engine mounted on a vehicle equipped with an electrical load operative on the power from the generator, the generator including a field winding to which current is supplied ... | 06/01/2010 |
| 7688040 | System and method for electric current and power monitoring and control of a generator A control device measures a voltage drop across a conductor in a generator to determine and control the total generator output current. A temperature of the conductor is also measured to improve the accuracy. The control device may further improve on the accuracy by... | 03/30/2010 |
| 7688039 | System and method for electric current and power monitoring and control of a generator A control device measures a voltage drop across a conductor in a generator to determine and control the total generator output current. A temperature of the conductor is also measured to improve the accuracy. The control device may further improve on the accuracy by... | 03/30/2010 |
| 7598713 | System and method for electric current and power monitor and control of a generator A control device measures a voltage drop across a conductor in a generator to determine and control the total generator output current. A temperature of the conductor is also measured to improve the accuracy. The control device may further improve on the accuracy by... | 10/06/2009 |
| 7560907 | Charging system for field devices A charging circuit for field devices is disclosed. The circuit has at least three modes and automatically shifts between the modes depending on voltage of the generator. In a first mode, the charging circuit provides voltage regulation. In a second mode, the chargin... | 07/14/2009 |
| 7560908 | Automatic voltage switching for generator voltage change A method of switching the operating voltage of a portable generator system includes operating an electrical generator to produce a first electrical signal and connecting a terminal assembly to the electrical generator. The terminal assembly is arranged in a first ar... | 07/14/2009 |
| 7554301 | Fault current limiting in an electrical power network Generators 12a are for a distributed generation system. A control system 32a receives information about network faults 14a. In normal conditions, the control system 32a controls the field current in the field c... | 06/30/2009 |
| 7521905 | High power permanent magnet alternator with improved controlled output Apparatus, systems, and methods are provided for reducing a potentially damaging high voltage fault condition in an alternator system. The apparatus comprises a motor, a rectifier coupled to the motor, an output node coupled to the rectifier, and a switch coupled be... | 04/21/2009 |
| 7514906 | Automotive rotary electrical apparatus An automotive rotary electrical apparatus with less than four switching control elements capable of blocking a field current while preventing breakage of the switching control elements in response to a malfunction in a feeder circuit for a field coil is proposed. Fi... | 04/07/2009 |
| 7508172 | Failure detection apparatus for an alternator A failure detection apparatus for an alternator can detect a short circuit failure of a diode in a full-wave rectifier with high precision by use of a simple circuit structure based on the state of a detection terminal when the alternator generates no electricity. T... | 03/24/2009 |
| 7466108 | Battery charging control device A battery charging control device comprising a control circuit that performs control to keep a voltage across a battery charged by an output of an AC generator around a target value, comprising: a load driving switch inserted between the battery and a load; and a lo... | 12/16/2008 |
| 7459889 | DC bus short circuit compliant power generation systems using induction machine Conventional electric power generation system employ a solid state electronically controlled IM that may be capable of self-start motoring and power generation, but, when the DC bus voltage collapses upon a failure, an additional external source of DC voltage is not... | 12/02/2008 |
| 7425818 | Apparatus for connecting a prime mover driven alternator to a circuit with an existing alternating current The present invention provides a connector arrangement operative to connect a prime mover driven alternator to an alternating current circuit with an existing alternating current. For example, the connector arrangement may be used to connect an alternator driven by ... | 09/16/2008 |
| 7417333 | Methods and apparatus for controlling current in an electrical machine A method for determining electric currents for an electrical machine includes generating a first real power current demand signal and a first reactive power current demand signal. The method also includes determining at least one of a second real power current deman... | 08/26/2008 |
| 7405541 | Control apparatus for automotive alternator having capability of reliably detecting disconnection between alternator and battery According to the present invention, there is provided a control apparatus for an automotive alternator which includes a switch, a target voltage setter, a voltage regulator, and a disconnection detector. The switch is configured to be selectively turned on and off s... | 07/29/2008 |
| 7405543 | Device for regulating the power output of an electrical generator in motor vehicles In a device for regulating the power output of an electrical generator in motor vehicles having an internal combustion engine, in which the generator has a regulator unit, which prevents exceeding at least one limiting temperature by regulation, the regulator unit i... | 07/29/2008 |
| 7394227 | Power generation control apparatus for vehicle A vehicle power generation control apparatus has a power supply circuit, a rotation detecting circuit, an exciting current detecting circuit, a torque detecting/maximum exciting current determining circuit, and an exciting current control circuit. The rotation detec... | 07/01/2008 |
| 7394166 | Method, apparatus and computer program product for wind turbine start-up and operation without grid power A wind turbine having features for black-starting includes an electric generation system for producing electricity by operation of the wind and comprising an interface for providing the electricity to an electric grid; a control system for controlling components of ... | 07/01/2008 |
| 7378820 | Electrical power generation system and method for generating electrical power An electrical power generation system and method for generating electrical power are provided. The electrical power generation system utilizes a master controller for controlling operation of devices coupled to an AC electrical grid and DC electrical grid based on p... | 05/27/2008 |
| 7368893 | Voltage control apparatus for electric generator of vehicle In a vehicle voltage control apparatus which regulates the output voltage of the vehicle electric generator and which receives an external control signal for lowering the regulated voltage value, from an external apparatus such as the engine ECU during engine starti... | 05/06/2008 |
| 7365520 | Vehicle-generator output voltage control apparatus The vehicle-generator output voltage control apparatus includes a voltage control circuit regulating an output voltage of a vehicle generator by controlling a field current flowing into a field winding of the vehicle generator by controlling a conduction state of a ... | 04/29/2008 |
| 7348764 | Coil switching of an electric generator An electric generator includes multiple coil sections and switches connected to the multiple coil sections for selectively interconnecting the coil sections in series, or in parallel, or in a series-parallel configuration across first and second power terminals for ... | 03/25/2008 |
| 7345457 | Brushless exciters using a high temperature superconducting field winding A brushless exciter for a synchronous generator or motor generally includes a stator and a rotor rotatably disposed within the stator. The rotor has a field winding and a voltage rectifying bridge circuit connected in parallel to the field winding. A plurality of fi... | 03/18/2008 |
| 7345456 | Power system stabilizer providing excitation limiter functions A stabilizer and synchronous electric power generator system using same that provides both power system damping and excitation limiter functionality. The stabilizer includes a processing unit and a memory storing routines executable by the processing unit. The routi... | 03/18/2008 |
| 7337863 | Circuit arrangement for the control of at least one electric machine The objective of providing a circuit arrangement for the control of at least one electric machine (1), which is suitable for also enabling operating conditions of the electric machine (1) that demand high power-peaks of short duration, is essentially a... | 03/04/2008 |
| 7327123 | Controller for AC generator A control system that can accommodate the wide variations in the output of a generator, such as a permanent magnet alternator, while providing an output with relatively uniform phase ripple. The control system includes a zero crossing detector and variable ramp gene... | 02/05/2008 |
| 7304403 | Power signaling based technique for detecting islanding conditions in electric power distribution systems A signaling system for detecting power line discontinuity in a power distribution system having a local power generator in a feeder line employs a signal generator that provides a local generator control signal with a preset protocol continuously and is located in t... | 12/04/2007 |
| 7301311 | Brushless starter-generator with independently controllable exciter field A starter-generator system supplies a controllable torque to a gas turbine engine, to thereby assist in starting the gas turbine engine, by independently controlling excitation frequency and/or voltage magnitude. The starter-generator includes a multi-phase exciter ... | 11/27/2007 |
| 7294991 | Method and apparatus for calculating/controlling power generation torque In an apparatus, a first detecting unit detects the number of revolutions of a power generator, a second detecting unit detects an output voltage of the power generator, and a third detecting unit detects an output current of the power generator. A torque calculatin... | 11/13/2007 |
| 7292010 | Energy attenuating device with the dynamical and adaptive damping feature 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 fa... | 11/06/2007 |
| 7282893 | Method and apparatus for generator control A generator control circuit is provided that includes a first circuit (44) monitoring a generator voltage change rate and producing a first output when the voltage change rate is above a first level, a second circuit (48) monitoring a generator current... | 10/16/2007 |
| 7279802 | Method in a wind power plant A method for preventing mechanical oscillation in a wind power plant includes determining wind speed, controlling a generator of the power plant with speed control when the wind speed is below a predefined limit to maintain the rotation speed of the generator below ... | 10/09/2007 |
