Daisuke Maeda
Daisuke Maeda, Hitachi JP
Patent application number | Description | Published |
---|---|---|
20080203962 | APPARATUS AND METHOD FOR DRIVING SYNCHRONOUS MOTOR - The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value. | 08-28-2008 |
20080224643 | SEMICONDUCTOR DEVICE FOR DRIVING MOTOR, THREE-PHASE MOTOR AND MOTOR DRIVING APPARATUS WITH THE SEMICONDUCTOR DEVICE AND FAN MOTOR - In order to prevent a short circuit of top and bottom arms of a motor driving IC when noise is added to six control signals for controlling six switching elements, there is provided a semiconductor device for driving a motor, being sealed with resin as one package and comprising: six switching elements for driving a three-phase motor; three output terminals for outputting voltages to the three-phase motor; at least one driving circuit for driving the six switching elements; three control signal input terminals; and a function) of generating six control signals for control of the six switching elements based on three control signals inputted through the three control signal input terminals. | 09-18-2008 |
20110018485 | APPARATUS AND METHOD FOR DRIVING SYNCHRONOUS MOTOR - The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value. | 01-27-2011 |
Daisuke Maeda, Kokubunji JP
Patent application number | Description | Published |
---|---|---|
20130319075 | Sensor Module and Sensor System - Reliability and accuracy of a sensor are secured while adjustment cost of a sensor module is suppressed. A signal component analysis part | 12-05-2013 |
20130340524 | INERTIAL SENSOR - In an inertial sensor, an acceleration sensor element section includes a first movable section configured to respond to acceleration applied thereto and a diagnosis electrode configured to displace the first movable section with an electrostatic force according to voltage application from a control circuit section. An angular velocity sensor element section includes a second movable section configured to respond to an angular velocity applied thereto and a driving electrode configured to displace the second movable section with an electrostatic force according to voltage application from the control circuit section. A voltage signal input to the driving electrode and a voltage signal input to the diagnosis electrode are the same voltage signal. The voltage signal input to the diagnosis electrode is a signal for detecting a mechanical failure. Carrier signal for detecting displacement of the first movable section has frequency higher than frequency of signal applied to the diagnosis electrode. | 12-26-2013 |
Daisuke Maeda, Chiyoda-Ku JP
Patent application number | Description | Published |
---|---|---|
20140000766 | HOT-ROLLED STEEL SHEET WITH EXCELLENT PRESS FORMABILITY AND PRODUCTION METHOD THEREOF | 01-02-2014 |
Daisuke Maeda, Funabashi-Shi JP
Patent application number | Description | Published |
---|---|---|
20150133588 | POLYMER COMPOSITION CONTAINING ORGANIC NONLINEAR OPTICAL COMPOUND - There is provided a polymer matrix that can suppress the orientational relaxation of an organic nonlinear optical compound, and a composition containing this polymer matrix and an organic nonlinear optical compound, and an optical material obtained by using the composition. A composition including: a norbornene imide polymer having a structural unit of Formula [1]; and an organic nonlinear optical compound: | 05-14-2015 |
20150252147 | AROMATIC POLYAMIDE AND FILM-FORMING COMPOSITION CONTAINING SAME - An aromatic polyamide, which is obtained by reacting a benzene tricarboxylic acid or a derivative thereof with a diamine compound in the presence of a terminally blocked compound having a crosslinkable group and a functional group that is reactive with a benzene tricarboxylic acid such as 1-amino-2-propanol or a derivative thereof as expressed by scheme (1), and which has a weight average molecular weight of 1,000-100,000 in terms of polystyrene as determined by gel permeation chromatography, has good solubility in organic solvents, while maintaining heat resistance and transparency. A thick film can be formed using a film-forming composition that contains this aromatic polyamide. | 09-10-2015 |
Daisuke Maeda, Narita-Shi JP
Patent application number | Description | Published |
---|---|---|
20150315683 | HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME - A hot-rolled steel sheet includes, as a chemical composition, by mass %, C: 0.030% to 0.10%, Mn: 0.5% to 2.5%, and Si+Al: 0.100% to 2.5%, in which the steel sheet has a microstructure including, by area fraction, ferrite: 80% or more, martensite: 3% to 15.0%, and pearlite: less than 3.0%, in which a number density of martensite having an equivalent circle diameter of 3 μm or more at a position which is at a depth of ¼ of the steel sheet thickness from the surface of the steel sheet, is 5.0 pieces/10000 μm | 11-05-2015 |