Patent application number | Description | Published |
20090058331 | Semiconductor Power Converter - A semiconductor power converter includes a power converter for converting direct current to three-phase alternating current or vice versa; a means for detecting a current in an alternating current side of the power converter; a means for providing a current reference in the alternating current side of the power converter; a current controller for calculating a voltage reference in the alternating current side of the power converter to match the current reference and a value of the detected current; and a pulse width modulation means for controlling the power converter through pulse width modulation based on the voltage reference, wherein the current reference is used in place of the value of the detected current for at least one phase current among three phase currents in the alternating current side. | 03-05-2009 |
20090108784 | Motor Control Apparatus and Motor System - In a motor control apparatus, apparatus all switching devices of all phases of an inverter are kept fixed at OFF in accordance with a value of an all-OFF control pulse signal Poff outputted by a pulse generator. The pulse generator generates at least twice a pulse causing an induced voltage detection signal Pdet to change to an H level. A terminal voltage of a motor is inputted in accordance with the value of the induced voltage detection signal Pdet. Data of the sampling round in which amplitude of the induced voltage signal is great and the signal is not in saturation is selected from the data so inputted and a rotor position is estimated. | 04-30-2009 |
20090140674 | CONTROL APPARATUS FOR AC MOTOR - It is attained by being provided with a motor constant calculation unit for calculating electric constants of a motor, and by correcting setting values of electric constants defined on one of the axes of two orthogonal axes, by a functional expression using a state variable defined on the same axis, and by correcting them by a functional expression using a state variable defined on the other axis. | 06-04-2009 |
20090323232 | ELECTRIC POWER CONVERSION DEVICE, COMPRESSOR MOTOR WITH THE DEVICE, AND AIR CONDITIONER WITH THE MOTOR - The device is provided with an electric power conversion circuit including switching elements for converting a DC electric power to an AC electric power, a load connected to an output side of the electric power conversion circuit, means for detecting a current flowing through a DC side in the electric power conversion circuit, a voltage command value preparing means for controlling the operation of the switching elements in the electric power conversion circuit and a wire breaking detecting means. The wire breaking detection means judges a wire breaking in the load or an abnormality of any of the switching elements in the electric power conversion circuit by making use of a DC current detection value in a period when a current of maximum voltage phase or of voltage minimum phase of the electric power conversion circuit is flowing in a DC current. | 12-31-2009 |
20110050140 | Driving system of permanent magnet synchronous motor - When applying a high frequency voltage which alternates on positive and negative sides to a permanent magnet synchronous motor, a driving system of synchronous motor switches the applied voltage phase by 120 degrees successively and applies resultant voltages to three phases. A pulsating current generated by applying a high frequency voltage is detected at timing of elapse of a predetermined time Δt since an output voltage of at least one phase has changed from a state in which all output voltages of the three phases of a power converter are positive or negative. Current detection is conducted by using a DC resistor or a phase current sensor provided on a DC bus. A magnetic pole estimation unit calculates the rotor magnetic pole position of the permanent magnet synchronous motor on the basis of differences between positive side and negative side change quantities in three-phase currents obtained from detected current values. | 03-03-2011 |
20130113212 | Wind Power Generator System, and Control Method for the Same - This invention is intended to provide a wind power generator system or method for controlling a wind power generator system, designed to implement switching-initiated smooth energy changeover without leading to a complex system configuration. | 05-09-2013 |
Patent application number | Description | Published |
20090030867 | REVIEWING APPARATUS, RECIPE SETTING METHOD FOR REVIEWING APPARATUS AND REVIEWING SYSTEM - A recipe setting method and reviewing apparatus which permit even a novice to analyze the contents of existing recipe settings without trial-and-error attempts in the reviewing apparatus for reviewing a sample and to create a new recipe in a short time based on the results of the analysis. By a reviewing apparatus having a function of reviewing a sample under registered review conditions, based on a recipe in which the review conditions are registered. The reviewing apparatus is configured to display a list of the contents of the settings of plural set items regarding plural recipes and to create a new recipe based on the results of analysis of commonality by using the contents of settings having high degrees of commonality as initial settings. | 01-29-2009 |
20090180680 | PATTERN DEFECT ANALYSIS EQUIPMENT, PATTERN DEFECT ANALYSIS METHOD AND PATTERN DEFECT ANALYSIS PROGRAM - A data processing unit acquires a review image including a pattern defect on a substrate, compares the review image with a reference image thereby to extract a defect image, the reference image including no pattern defect, and performs an alignment between the review image and a self-layer design pattern image which is generated from design data belonging to the identical layer in a region corresponding to the review image. The data processing unit, then, based on result of the alignment, generates an another-layer design pattern image which is generated from design data belonging to another layer in the region corresponding to the review image, and, based on a synthesized image of the defect image and the another-layer design pattern image, determines the relative position relationship between the pattern defect and a pattern belonging to another layer, and judges the criticality based on the relative position relationship. | 07-16-2009 |
20120114221 | PATTERN DEFECT ANALYSIS EQUIPMENT, PATTERN DEFECT ANALYSIS METHOD AND PATTERN DEFECT ANALYSIS PROGRAM - A data processing unit acquires a review image including a pattern defect on a substrate, compares the review image with a reference image thereby to extract a defect image, the reference image including no pattern defect, and performs an alignment between the review image and a self-layer design pattern image which is generated from design data belonging to the identical layer in a region corresponding to the review image. The data processing unit, then, based on result of the alignment, generates an another-layer design pattern image which is generated from design data belonging to another layer in the region corresponding to the review image, and, based on a synthesized image of the defect image and the another-layer design pattern image, determines the relative position relationship between the pattern defect and a pattern belonging to another layer, and judges the criticality based on the relative position relationship. | 05-10-2012 |
20120327212 | SEM TYPE DEFECT OBSERVATION DEVICE AND DEFECT IMAGE ACQUIRING METHOD - The present invention enables provision of a defect observation device that reduces wait time from an end of pickup of a reference image and accompanying processing to a start of pickup of a defect image compared to conventional ones by making a pixel count resolution of the reference image be low compared to a pixel count of the defect image in an image pickup unit using an electronic microscope for automatic fine defect classification, whereby a throughput enhanced compared to those of conventional ones can be achieved. | 12-27-2012 |
20130278748 | PATTERN MATCHING METHOD AND APPARATUS - When the degree of matching between patterns decreases due to a pattern fluctuation or an appearance fluctuation that has occurred during manufacturing steps, a heavy work burden would be placed on an operator. A data processing unit of a pattern matching apparatus calculates a threshold for determination of matching between a first template image and a partial region of a search target image obtained by capturing an image of the surface of a sample, on the basis of a result of evaluation of a similarity between the search target image and a second template image, the second template image having been captured in a wider range than the first template image. | 10-24-2013 |