| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 318702000 | Antihunting or damping | 10 |
| 20090009129 | Active damping for synchronous generator torsional oscillations - A generator control unit (GCU) provides active damping of a synchronous generator by monitoring the speed of the synchronous generator and detecting oscillations in the monitored speed. The oscillations are indicative of torsional oscillations within the mechanical drivetrain including the synchronous generator or generators. In response to detected oscillations in the monitored speed, the GCU generates a varying set-point value that is used to control the excitation voltage provided to the synchronous generator. Varying the excitation voltage provided to the synchronous generator causes a variation in synchronous generator torque. By selectively varying the torque in the synchronous generator, the GCU provides active damping in the synchronous generator that decreases or dampens the torsional oscillations. | 01-08-2009 |
| 20090256516 | ELECTROMECHANICAL MACHINE CONTROL SYSTEM - There is provided an electromechanical machine control system for variable speed controlling an electromechanical machine which can realize a desired control response and a stable control system by online regulating the gain of a linear differential controller by current feedback based on an electric parameter or mechanical parameter of the electromechanical machine. | 10-15-2009 |
| 20100237821 | VECTOR CONTROL DEVICE FOR ALTERNATING-CURRENT ELECTRIC MOTOR - There is provided a vector control device for an alternating-current electric motor having a damping controller which automatically calculates an optimum damping operation amount and does not require any gain setting itself, whereby an adjustment work of a control system can be simplified. The vector control device is equipped with a vector controller | 09-23-2010 |
| 20100315033 | SYSTEM AND METHOD OF DYNAMIC REGULATION OF REAL POWER TO A LOAD - A system and method for controlling an AC motor drive includes a control system programmed with an energy algorithm configured to optimize operation of the motor drive. Specifically, the control system receives input of an initial voltage-frequency command to the AC motor drive, receives a real-time output of the AC motor drive generated according to the initial voltage-frequency command, and determines a real-time value of a motor parameter based on the real-time output of the AC motor drive. The control system also inputs a plurality of modified voltage-frequency commands to the AC motor drive, determines the real-time value of the motor parameter corresponding to each of the plurality of modified voltage-frequency commands, and identifies an optimal value of the motor parameter based on the real-time values of the motor parameter. The control system maintains an input of a current modified voltage-frequency command when the real-time value of the motor parameter corresponds to the optimal value of the motor parameter. | 12-16-2010 |
| 20110234144 | MOTOR CONTROL DEVICE AND ELECTRICAL EQUIPMENT WITH MOTOR CONTROLLED THEREBY - A motor control device includes a current detecting unit detecting current flowing into a motor winding, a speed/electrical angle estimating unit estimating a rotational speed and an electrical angle of the motor, based on the current, a load torque estimating unit estimating load torque to be developed by a load, from a torque current obtained based on the current and the electrical angle, a motor constant and inertia moment of the motor inclusive of the load, a load torque phase calculating unit calculating a phase of periodic fluctuation indicated by the load torque, a torque-compensating current determining unit determining a sinusoidal torque-compensating current, based on the load torque phase, and an amplitude/phase adjusting unit detecting speed fluctuation of the motor to adjust amplitude and phase of the torque compensating current by increasing or decreasing the amplitude and the phase so that the speed fluctuation is reduced. | 09-29-2011 |
| 20130175970 | CURRENT CONTROL GAIN ADJUSTING METHOD FOR PM MOTOR, CURRENT CONTROL METHOD, AND CONTROL DEVICE - The present invention includes a voltage applying step of applying an applied voltage including a DC component and a plurality of frequency components to a PM motor, a motor current detecting step of detecting a motor current flowing depending on the applied voltage, and a current control gain adjusting step of calculating a current control gain based on frequency characteristics of the applied voltage and the motor current. In this manner, a stable current control gain having a high current response can be adjusted within a short period of time. | 07-11-2013 |
| 20130200839 | RECTIFIER BASED TORSIONAL MODE DAMPING SYSTEM AND METHOD - A torsional mode damping controller system connected to a converter that drives a drive train including an electrical machine and a non-electrical machine. The controller system includes an input interface configured to receive measured data related to variables of the converter or the drive train and a controller connected to the input interface. The controller is configured to calculate at least one dynamic torque component along a section of a shaft of the drive train based on the measured data from the input interface, generate control data for a rectifier of the converter for damping a torsional oscillation in the shaft of the drive train based on the at least one dynamic torque component, and send the control data to the rectifier for modulating an active power exchanged between the converter and the electrical machine. | 08-08-2013 |
| 20140203754 | METHOD OF CONTROLLING AN AC MACHINE AND CONTROLLER FOR CONTROLLING AN AC MACHINE - A method of controlling an AC machine that includes a stator and a rotor. The method includes observing a stability parameter that is indicative of the stability of the AC machine and dependent on a current state of the AC machine; and controlling the AC machine based on the observed stability parameter so as to promote stable operation of the AC machine. The method may include controlling the AC machine to operate as a motor or as a generator. The AC machine may be a permanent magnet synchronous machine. A controller suitable for performing the method is also disclosed. | 07-24-2014 |
| 20150091492 | SYSTEM, METHOD AND APPARATUS FOR COMPUTING, MONITORING, MEASURING, OPTIMIZING AND ALLOCATING POWER AND ENERGY FOR A ROD PUMPING SYSTEM - A system and methods are provided for controlling a motor of a rod pumping system using previous RPMs of the motor and predicting an RPM of the motor; correcting a power factor of a motor of a rod pumping system; allocating energy consumption and allocating energy generation for a set of wells connected to an electricity meter using an amount of energy generated by each well; and generating an alert if a set of data is beyond a threshold for the set of data. | 04-02-2015 |
| 20160254772 | A Method For Suppressing A Speed Fluctuation, A Control Apparatus And A Compressor Control System | 09-01-2016 |
