| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 322027000 | Current output | 13 |
| 20090009146 | Generating system with a regulated permanent magnet machine - An electromechanical power transfer system that transfers power between a prime mover and a direct current (DC) electrical power system, comprises: a permanent magnet machine (PMM) that has a permanent magnet (PM) rotor coupled to the prime mover, a stator with a multiphase alternating current (AC) winding coupled to an AC bus and a control coil with a winding that has a configuration to generate a magnetic field with flux that varies the reactance of the stator winding with the application of control coil current; a position sensing system for generating a rotor position signal that is representative of the angular position of the PM rotor; a control coil current sensor for generating a control coil current signal that is representative of the level of electrical current in the control coil; an electrical potential sensor for generating a DC bus potential signal that is representative of the level of DC potential on the DC bus; an electrical current sensor for generating a DC bus current signal that is representative of the level of DC current that the active rectifier supplies to the electrical load by way of the DC bus; an output power estimator that compares the DC bus potential signal with the DC bus current signal to generate an output power signal; a differentiator that receives the output power signal to generate a respective rate of output power signal; a summer that adds the rate of output power signal with the DC bus potential signal to generate a DC potential feedback signal; and a selectable main active/passive rectifier system for converting multiphase AC power developed by the stator to DC power supplied to the electrical load by way of a DC bus; a control coil current regulator system to regulate the control coil current; wherein the control coil current regulator system generates a level of the control coil current that regulates current in the stator to a desired level in response to a control coil current feedback loop that comprises the control coil current signal and a DC bus potential feedback loop that comprises the DC potential feedback signal and in a generating mode the main active rectifier system maintains a constant potential on the DC bus regardless of sudden changes in electrical load on the DC bus in response to the DC bus potential feedback loop and the rotor position feedback loop; and wherein both the control coil current regulator system and the main active rectifier system switch from an active regulating mode to a protection non-regulating mode upon detection of a fault in the DC bus. | 01-08-2009 |
| 20090237037 | Alternator voltage regulator with maximum output limiting function - An alternator system includes a field circuit, a regulator that regulates a field circuit electrical flow through the field circuit, and an output current sensor that detects an actual current output from the alternator system. The alternator system further includes a controller that communicates with the regulator to vary the field circuit electrical flow based on the actual current detected by the output current sensor. | 09-24-2009 |
| 20100033141 | 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 regard to some loads which are generally of an active nature, the capacity of a first generator, which is voltage controlled, may be insufficient to adequately avoid transient voltage instability. By providing an actuator signal from a load to act as a pre-emptive or forward feed to an electrical current controlled generator, that second electrical current generator can be arranged to provide additional or reduced electrical current to avoid system voltage instability. | 02-11-2010 |
| 20110074365 | WIND POWER GENERATING SYSTEM AND CONTROL METHOD FOR THE SAME - A wind power generating system includes a unit for eliminating harmonics component of specified-order from inputted current detection value of a grid-side converter and a unit for controlling the grid-side converter using the current detection value in which harmonics are eliminated. | 03-31-2011 |
| 20110204856 | VEHICLE GENERATOR - The vehicle generator includes an armature winding including a plurality of phase windings, a switching section formed as a bridge circuit constituted of a plurality of pairs of an upper arm and a lower arm connected in series to rectify voltages induced in the phase windings, each of the upper and lower arms being constituted of a switching element parallel-connected with a diode, a control section for controlling on/off timings of the switching elements, and a voltage zero-cross detecting section for performing voltage zero-cross detection to detect, as voltage zero-cross points, time points at which at least one of line-to-line voltages among the phase windings of the armature winding changes in polarity. The control section is configured to start on-off control of the switching elements based on the voltage zero-cross points detected by the voltage zero-cross detecting section. | 08-25-2011 |
| 20120025788 | LOW-LOSS ZERO CURRENT SWITCHING SHUNT REGULATOR FOR AC ALTERNATOR - A control circuit for use with an AC alternator has a plurality of outlet lines leading from the alternator, each receiving a phase of current generated by the alternator. Tap lines are associated with each of the power lines and are associated with a switch. The switches drain power to a drain when in a first state, and allow the power to pass downstream to a system load when in a second state. A switch control changes the switches between the first and second state. A detector detects when the current signal is approaching a zero crossing between a cycle positive portion and a negative portion. The switch control takes in the information with regard to the approaching zero crossing, and change the switches between the first and second states based upon the detected zero crossing point. An alternator is also disclosed. | 02-02-2012 |
| 20130320936 | CURRENT CONTROLLER AND GENERATOR SYSTEM - A current controller for controlling plural stator currents of plural stator windings of an electrical machine, in particular a generator, is provided, wherein the plural windings are separately connectable to a converter. The current controller includes a positive-sequence current controller configured to provide a first voltage command, in particular in a rotating dq+ frame, based on the plural stator currents; a negative-sequence current controller configured to provide a second voltage command, in particular in the dq+ frame, based on the plural stator currents. Further, the current controller includes a summation system for adding the first voltage command and the second voltage command to obtain a summed voltage command based on which the converter is controllable. | 12-05-2013 |
| 20140253053 | RESONANT COMMUTATION SYSTEM FOR EXCITING A THREE-PHASE ALTERNATOR - An alternator has a field coil that produces a magnetic field which induces electricity in a coil arrangement. A field coil excitation system includes a generator with an output coil assembly for producing alternating electricity. A rectifier converts the alternating electricity into voltage and direct current at two nodes. A capacitor, between the nodes, has capacitance that forms a resonant circuit with inductance of the output coil assembly. Due to that resonant circuit, the voltage and direct current oscillate in a predefined phase relationship. A switch and the field coil are connected in series between the nodes. A controller renders the switch conductive for a time period specified by a received control signal. The switch is rendered non-conductive at the first occurrence of a minimum current level after the time period ends. The predefined phase relationship enables the minimum current level to be detected by sensing the voltage. | 09-11-2014 |
| 20140266078 | GENERATOR ARCHITECTURE WITH MAIN FIELD ROTATING POWER CONVERTER - A generator includes a stationary portion and a rotating portion. The stationary portion includes a main armature winding and the rotating portion includes a main field winding a main field rotating power converter that selectively controls current supplied to the main field winding. | 09-18-2014 |
| 20150061607 | METHODS AND SYSTEMS FOR AN INTEGRATED ELECTRICAL GENERATOR WITH HYBRID RECTIFIER - An electrical DC generation system is disclosed. According to one aspect, a system for electrical DC generation includes an electrical machine having multiple stator windings and multiple rectifiers for connection to portions of the stator windings. At least one active rectifier and at least one passive rectifier are connected in series to form a DC bus having a positive terminal and a negative terminal, where the positive terminal of the DC bus is connected to a positive output terminal of the electrical machine and where the negative terminal of the DC bus is connected to a negative output terminal of the electrical machine. The at least one active rectifier is used to control a current flowing through the DC bus and/or an output voltage of the electrical machine. | 03-05-2015 |
| 20160123305 | CONTROLLING THE ENERGY FLOW FROM AN ELECTRICAL MACHINE WITH UNBALANCED IMPEDANCE - A method, an arrangement and a computer program for controlling an energy flow to a grid, from an electrical alternating current machine with unbalanced impedance, in particular an electrical alternating current generator of a wind turbine, the method comprising: obtaining a first power signal representing a first power command. | 05-05-2016 |
| 20160149390 | SECURE AND DEPENDABLE DIFFERENTIAL PROTECTION FOR ELECTRIC POWER GENERATORS - Secure and dependable differential protection for electric power generators is described herein. An internal fault is declared if the operating current exceeds a function of the restraining current, and the operating current exceeds and adjusted pickup value. The adjusted pickup value is selected as a minimum of a compensated first pickup value and a second pickup value. The compensated first pickup value may be calculated by adding the absolute value of a compensation addend with a first pickup value. The compensation addend may be calculated by filtering, compensating, and summing current values from the neutral side and the power system side of the electrical generator. The absolute value of the compensation addend may be further adjusted using a security compensation factor. | 05-26-2016 |
| 20160164445 | Field Current Profile - An output of a generator may vary according to the speed of the engine, physical characteristics of the engine, or other factors. A profile for a generator that describes a periodic fluctuation in an operating characteristic for the generator is identified. A field current of an alternator associated with the generator is modified based on the profile for the generator in order to counter variations in the output of the generator. | 06-09-2016 |
