| Patent application number | Description | Published |
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| 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 |
| 20090146592 | POSITION SENSORLESS CONTROLLER FOR PERMANENT MAGNET MOTOR - In a calculation for estimating axis error in a permanent magnet motor, a d-axis commanded voltage value is added to the product of three signals, which are a q-axis detected current value or commanded current value, an inductance value, and an estimated speed value, and then the resulting value is divided by the product of a commanded speed value ω | 06-11-2009 |
| 20090322262 | Controller For Permanent Magnet Synchronous Motor and Motor Control System - A motor control system includes a power converter, a vector controller for controlling the power converter, an axial error estimating operation for estimating an axial error which is a deviation between the phase estimation value and phase value of the motor, and a rotational speed estimating computing unit | 12-31-2009 |
| 20100231148 | Torque Controller for Permanent Magnet Synchronous Motor - When output voltage V | 09-16-2010 |
| 20110006715 | Control Unit and Control Method for Permanent Magnet Synchronous Motor - If magnitude relations between the output terminal voltage based on a DC negative terminal of the inverter and a threshold voltage that is a fixed value are compared, polarity thereof is changed at a predetermined rotor phase. The magnitude relation, for example, is detected by an inexpensive and simple apparatus such as a level shift circuit and a NOT circuit. The rotor phase of the permanent magnet synchronous motor is inferred on the basis of changes in the magnitude relation and if it is differentiated, a rotation speed is inferred. If the inferred values of the rotor phase and rotation speed are fed back to synchronous operation or vector control, the free-running permanent magnet synchronous motor is restarted. | 01-13-2011 |
| Patent application number | Description | Published |
|---|
| 20100151323 | ELECTRODE, ELECTRODE PASTE AND ELECTRONIC PARTS USING THE SAME - The objects of the present invention are to provide a copper-base electrode which can be calcined in an oxidative atmosphere, e.g., in air, like a silver electrode, and is less expensive than a silver electrode; an electrode paste; and electronic parts using it. The other objects of the present invention are to provide a copper-base electrode which can be calcined in an inert gas atmosphere, e.g., in nitrogen, at low temperature; an electrode paste; and electronic parts using it. | 06-17-2010 |
| 20100180934 | LOW SOFTENING POINT GLASS COMPOSITION, BONDING MATERIAL USING SAME AND ELECTRONIC PARTS - A low softening point glass composition, which is substantially free from lead, bismuth and antimony and comprises oxides of vanadium, phosphorous, tellurium and iron, a softening point of the composition being 380° C. or lower. | 07-22-2010 |
| 20100307802 | Wiring Member, Method of Manufacturing the Wiring Member and Electronic Element - A wiring member comprising a substrate, a copper wiring layer having an electrical resistivity of not larger than 4×10 | 12-09-2010 |
| 20110001094 | ELECTROCONDUCTIVE MATERIAL AND POSITIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY USING THE SAME - Disclosed is an electroconductive material which contains at least a vanadium oxide and a phosphorus oxide, and has a crystalline structure composed of a crystalline phase and an amorphous phase, in which the crystalline phase contains a monoclinic vanadium-containing oxide, and a volume of the crystalline phase is larger than that of the amorphous phase. | 01-06-2011 |
