| Patent application number | Description | Published |
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| 20080231219 | MOTOR DRIVE APPARATUS AND MOTOR DRIVE METHOD - To reduce noise by limiting a current peak value to a predetermined value or less and by smoothing the waveforms of drive currents during the current limitation, switching control means ( | 09-25-2008 |
| 20090218972 | METHOD AND APPARATUS FOR DETECTING REVERSE CURRENT, AND METHOD AND APPARATUS FOR DRIVING MOTOR - A reverse current detection apparatus determines whether an electrical conduction control to a motor coil of a motor is in a predetermined state based on a timing signal representing a timing at which to conduct a source current or a sink current through the motor coil and a control signal for a half bridge in a power stage, and compares the output voltage of the power stage with a threshold value, so as to detect the presence/absence of a reverse flow of a phase current based on these results. A motor driving apparatus for driving a motor under a PWM control includes a rectification switching section for switching a rectification scheme from one to another based on the reverse current detection apparatus and a detection result thereof. | 09-03-2009 |
| 20090243526 | DEVICE AND METHOD FOR DETECTING BACK ELECTROMOTIVE FORCE PHASE AND DEVICE AND METHOD FOR CONTROLLING EXCITATION - In a back electromotive force phase detecting device, a timing generating unit generates a timing signal indicating a start timing, an intermediate timing and an end timing of a 180-degree electrical angle period in a detection target phase, from an excitation pulse signal. A difference calculating unit receives the timing signal, and calculates a difference between a total PWM control period of the detection target phase during a first-half 90-degree period, and a total PWM control period of the detection target phase during a second-half 90-degree period. In an excitation control device, a control unit changes the capability of driving a motor based on an output of the back electromotive force phase detecting device. | 10-01-2009 |
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| 20090176059 | Thermal Barrier Coating Member, Method for Producing the Same, Thermal Barrier Coating Material, Gas Turbine, and Sintered Body - There are provided a thermal barrier coating material and a thermal barrier coating member that can suppress spalling when used at a high temperature and have a high thermal barrier effect, a method for producing the same, a turbine member coated with a thermal barrier coating, and a gas turbine. The thermal barrier coating member comprises a heat resistant substrate, a bond coat layer formed thereon, and a ceramic layer formed further thereon, wherein the ceramic layer comprises an oxide which consists of an oxide represented by the general formula A | 07-09-2009 |
| 20100217540 | METHOD FOR ESTIMATING PHYSICAL PROPERTY OF CERAMIC, METHOD FOR ESTIMATING PHYSICAL PROPERTY OF THERMAL BARRIER COATING, METHOD FOR ESTIMATING REMAINING LIFETIME OF THERMAL BARRIER COATING, METHOD FOR ESTIMATING REMAINING LIFETIME OF HIGH-TEMPERATURE MEMBER, AND PHYSICAL PROPERTY ACQUIRING APPARATUS - A method is provided by which physical properties, in particular, the Young's modulus and thermal conductivity of a ceramic layer of a thermal barrier coating formed on a high-temperature member are accurately estimated in a short period of time. A method for estimating a physical property of a ceramic includes a step of calculating the Larson-Miller parameter from the time for which and the temperature at which the ceramic is heated; a step of acquiring the porosity of the ceramic corresponding to the calculated Larson-Miller parameter, based on the calculated Larson-Miller parameter and a diagram correlating the Larson-Miller parameter and the porosity obtained from samples having the same composition as the ceramic; and a step of acquiring the physical property of the ceramic corresponding to the acquired porosity, based on the acquired porosity and a diagram correlating the porosity and the physical property obtained from samples having the same composition as the ceramic. | 08-26-2010 |
| 20100242797 | THERMAL BARRIER COATING MATERIAL - A thermal barrier coating material having a lower thermal conductivity than rare earth stabilized zirconia materials. A thermal barrier coating material comprising mainly a compound represented by composition formula (1): | 09-30-2010 |
| 20110262770 | THERMAL BARRIER COATING MATERIAL, THERMAL BARRIER COATING, TURBINE MEMBER, AND GAS TURBINE - A thermal barrier coating material that exhibits superior high-temperature crystal stability to YSZ, as well as a high degree of toughness and an excellent thermal barrier effect. Also provided are a thermal barrier coating, which has a ceramic layer formed using the thermal barrier coating material and exhibits excellent durability to heat cycling, and a turbine member and a gas turbine which are each provided with the thermal barrier coating. The thermal barrier coating material comprises mainly ZrO | 10-27-2011 |
