Patent application number | Description | Published |
20110262758 | ENAMEL AND GROUND COAT COMPOSITIONS - A composition that upon firing, forms a non-stick enamel layer is disclosed. The composition can be applied to a metal substrate to provide a non-stick, durable coating for cooking surfaces. Also disclosed are methods of forming enamel layers and corresponding coated substrates. Various ground coats and related methods are also described. Furthermore, various multilayer coatings and structures are disclosed that include an enamel layer and a ground coat layer. | 10-27-2011 |
20130045389 | Dark Colored Easy-To-Clean Enamel - A composition that upon firing, forms a low-temperature clean enamel layer is disclosed. The composition can be applied to a metal substrate to provide a low-temperature cleaning, durable coating for cooking surfaces. Also disclosed are methods of forming enamel layers and corresponding coated substrates. Various ground coats and related methods are also described. Furthermore, various multilayer coatings and structures are disclosed that include an enamel layer and a ground coat layer. | 02-21-2013 |
20140302331 | Enamel And Ground Coat Compositions - A composition that upon firing, forms a non-stick enamel layer is disclosed. The composition can be applied to a metal substrate to provide a non-stick, durable coating for cooking surfaces. Also disclosed are methods of forming enamel layers and corresponding coated substrates. Various ground coats and related methods are also described. Furthermore, various multilayer coatings and structures are disclosed that include an enamel layer and a ground coat layer. | 10-09-2014 |
Patent application number | Description | Published |
20100027746 | X-ray diffraction wafer mapping method for rhombohedral super-hetero-epitaxy - A new X-ray diffraction (XRD) method is provided to acquire XY mapping of the distribution of single crystals, poly-crystals, and twin defects across an entire wafer of rhombohedral super-hetero-epitaxial semiconductor material. In one embodiment, the method is performed with a point or line X-ray source with an X-ray incidence angle approximating a normal angle close to 90°, and in which the beam mask is preferably replaced with a crossed slit. While the wafer moves in the X and Y direction, a narrowly defined X-ray source illuminates the sample and the diffracted X-ray beam is monitored by the detector at a predefined angle. Preferably, the untilted, asymmetric scans are of {440} peaks, for twin defect characterization. | 02-04-2010 |
20120200696 | Lock-In Imaging System for Detecting Disturbances in Fluid - A lock-in imaging system is configured for detecting a disturbance in air. The system includes an airplane, an interferometer, and a telescopic imaging camera. The airplane includes a fuselage and a pair of wings. The airplane is configured for flight in air. The interferometer is operatively disposed on the airplane and configured for producing an interference pattern by splitting a beam of light into two beams along two paths and recombining the two beams at a junction point in a front flight path of the airplane during flight. The telescopic imaging camera is configured for capturing an image of the beams at the junction point. The telescopic imaging camera is configured for detecting the disturbance in air in an optical path, based on an index of refraction of the image, as detected at the junction point. | 08-09-2012 |
Patent application number | Description | Published |
20080315822 | Rotor position detection at standstill and low speeds using a low power permanent magnet machine - For a multiphase alternating current (AC) wound field synchronous machine (WFSM) that has a stator with a selected number of poles, the WFSM having an associated exciter and multiphase AC permanent magnet machine (PMM) directly coupled to the WFSM, a method of sensing the position of a rotor in the WFSM comprises the steps of: configuring a stator for the PMM to have a number of poles that is a sub-multiple of the selected number of WFSM stator poles; configuring a rotor for the PMM to have high saliency; applying multiphase AC power of a selected frequency to the PMM stator: detecting at least one set of stator harmonic currents of the multiphase AC power resulting from the rotor saliency; converting the detected PMM harmonic stator currents from their multiphase coordinates to αβ coordinates; rotating the converted PMM stator currents into a reference frame for at least one selected harmonic to generate αβ coordinate harmonic current vectors; and estimating the position of the WFSM rotor based on the values of the αβ coordinate harmonic current vectors in the selected harmonic reference frame. | 12-25-2008 |
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 |
20100175478 | Torque Oscillation Monitoring - A method of detecting and monitoring torsional oscillation in a mechanical coupling between a prime mover and a multiphase alternating current (AC) electrical generator, comprises the steps of: detecting in at least one received signal variations that are indicative of changes in the rotational speed of the electrical generator; extracting information from the detected variations that are indicative of torsional oscillation to produce a torsional oscillation signal that has information relating to at least the amplitude of the torsional oscillation; and monitoring the torsional oscillation signal to determine the presence and severity of the torsional oscillation in the mechanical coupling. | 07-15-2010 |
20100327820 | 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. | 12-30-2010 |
20110115444 | ELECTRIC LOAD DAMPER FOR DAMPING TORSIONAL OSCILLATION - An electric load damper assembly includes a synchronous generator operable to provide a plurality of phases of electrical output in response to a mechanical input from a rotating shaft. An electric load damper includes a phase leg for each of the plurality of phases. Each phase leg includes a resistive load, a snubber and at least one solid state switch. The at least one solid state switch is in parallel with the snubber, and the at least one solid state switch and snubber are collectively in series with the resistive load. A controller is operable to receive a signal indicative of a rotational speed oscillation of the synchronous generator, and is operable to selectively reduce a torsional oscillation of the shaft by diverting electrical current from the synchronous generator through the resistive load of each of the plurality of phases in response to the signal exceeding a predefined threshold. | 05-19-2011 |
20110266987 | SYNCHRONOUS DISTURBANCE SUPPRESSION IN A VARIABLE SPEED MOTOR DRIVE - A variable speed drive for an electric motor has an inverter for receiving pulse width modulation controls. The inverter communicates power signals to a poly-phase electrical motor. A resolver communicates signals from the poly-phase motor back to a motor control. The motor control includes a speed control, a field-oriented control, and a pulse width modulation drive for driving the inverter. The resolver is connected to the speed control and to the field-oriented control, and further communicates with a synchronous compensator. The synchronous compensator is configured to drive the harmonic content at a target frequency or frequencies in a selected signal towards zero over time. | 11-03-2011 |
20120062161 | ROTOR POSITION DETECTION AT STANDSTILL AND LOW SPEEDS USING A PMG TO OPERATE A WOUND FIELD SYNCHRONOUS MACHINE - A method of operating a WFSM in a motoring mode determines a relative position of a PMG rotor with respect to the WFSM rotor. A PMG is coupled to the WFSM via a coupling shaft. A relative difference between the WFSM rotor position and the PMG rotor position is determined based on carrier injection sensorless (“CIS”) stimulation signals. The relative difference between the PMG rotor and the WFSM main machine in conjunction with the PMG rotor position is used to determine the WFSM rotor position during motoring operation of the main machine. A stator of the WFSM main machine is energized to maintain operation of the WFSM in response to the detected main rotor position. | 03-15-2012 |
20120299515 | WOUND FIELD SYNCHRONOUS MACHINE ROTOR TRACKING USING A CARRIER INJECTION SENSORLESS SIGNAL AND EXCITER CURRENT - An example method of initiating operation of a wound field synchronous machine in a motoring mode includes estimating an initial position of a rotor of a wound field synchronous machine using a carrier injection sensorless stimulation signal. The method tracks an operating position of the rotor based on current harmonics of the wound field synchronous machine. The method also calibrates the tracking using the initial position. | 11-29-2012 |
20130193888 | SENSORLESS ROTOR POSITION DETERMINATION FOR A WOUND FIELD SYNCHRONOUS MACHINE - A rotor position determination and tracking system for a dynamo electric machine includes a first AC power supply to inject a carrier wave into a main stator of the dynamoelectric machine and a second AC power supply to inject an excitation voltage or current into an exciter stator of the dynamo electric machine. A plurality of current sensors and voltage sensors located at the exciter input lines sense current and voltage thereat. A first control logic receives the sensed current and voltage and outputs an estimated rotor position. A second control logic receives an estimated exciter field voltage or current rotating wave form angle and filtered sensed current or voltage signals from the first control logic and utilizes a known main stator carrier frequency to determine the rotor position. The rotor position is input into the first control logic to calibrate the first control logic for tracking of the true rotor position. | 08-01-2013 |
20150097372 | THREE PHASE FLUX SWITCHING GENERATOR IN A THREE STAGE WOUND FIELD SYNCHRONOUS MACHINE - A brushless, three phase wound field synchronous machine (WFSM) provides an electromechanical power transfer system wherein it may serve as both a starter and a generator. Power for the excitation system of the WFSM is provided by a three phase flux switching generator (FSG). The three phase FSG also provides position sensor functionality for the WFSM when the WFSM operates in the starter/motor mode. | 04-09-2015 |
Patent application number | Description | Published |
20090171177 | System And Method For Attaching A Sensor To A Patient's Skin - A method and apparatus for affixing a sensor adjacent a tissue site is disclosed. In an embodiment, the spectrophotometric sensor comprises, a sensor body, one or more light emitters, one or more photodetectors, and a light scattering medium capable of increasing at least one of the effective detection area of the one or more photodetectors or the effective emission area of the one or more light emitters. | 07-02-2009 |
20100280582 | DEVICE, SYSTEM AND METHOD OF REMOVING HEAT FROM SUBCUTANEOUS LIPID-RICH CELLS - Devices, systems and methods for removing heat from subcutaneously disposed lipid-rich cells are disclosed. In selected embodiments, suction and/or heat removal sources are coupled to an applicator. The applicator includes a flexible portion and a rigid portion. The rigid portion includes a thermally conductive plate and a frame coupling the thermally conductive plate and the flexible portion. An interior cavity of the applicator is in fluid communication with the suction source, and the frame maintains contiguous engagement between the heat removal source and the thermally conductive plate. | 11-04-2010 |
20110066016 | OPAQUE, ELECTRICALLY NONCONDUCTIVE REGION ON A MEDICAL SENSOR - A medical sensor may be adapted to prevent unwanted light and electrical interference from corrupting physiological measurements. Sensors are provided with features that reduce the amount of outside light or shunted light that impinge the detecting elements of the sensor. The sensor is adapted to reduce crosstalk between electrical signals, increasing the accuracy of measurements. The sensor is also adapted to reduce the effect of outside light or shunted light on pulse oximetry measurements. | 03-17-2011 |
20140257443 | DEVICE, SYSTEM AND METHOD OF REMOVING HEAT FROM SUBCUTANEOUS LIPID-RICH CELLS - Devices, systems and methods for removing heat from subcutaneously disposed lipid-rich cells are disclosed. In selected embodiments, suction and/or heat removal sources are coupled to an applicator. The applicator includes a flexible portion and a rigid portion. The rigid portion includes a thermally conductive plate and a frame coupling the thermally conductive plate and the flexible portion. An interior cavity of the applicator is in fluid communication with the suction source, and the frame maintains contiguous engagement between the heat removal source and the thermally conductive plate. | 09-11-2014 |