| Patent application number | Description | Published |
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| 20110074320 | CONTROL DEVICE FOR ELECTRIC MOTOR DRIVE DEVICE - A control device that controls an electric motor drive device. The control device is configured with a first voltage control section that derives a modulation rate representing a ratio of an effective value of the voltage command values to the DC voltage and a voltage command phase. A second voltage control section generates a control signal for controlling the DC/AC conversion section on the basis of the modulation rate, the voltage command phase, and a magnetic pole position representing a rotational angle of a rotator of the AC electric motor. A computation cycle of the first voltage control section is set to be longer than a computation cycle of the second voltage control section. | 03-31-2011 |
| 20110080125 | CONTROL DEVICE FOR ELECTRIC MOTOR DRIVE APPARATUS - A electric motor drive apparatus comprising a voltage control unit performing voltage control processing that determines alternating-current voltage command values serving as command values of the alternating-current voltages to be supplied to the alternating-current electric motor and generates switching control signals for the inverter; and a control mode selection unit selecting a synchronous control mode in which a cycle of electric angle of the alternating-current electric motor is synchronized with a switching cycle of the inverter, or an asynchronous control mode in which the cycles are not synchronized with each other. Current detection processing is performed to detect currents flowing in coils of the alternating-current electric motor in every standard calculation cycle that is set to a half of a cycle of the carrier. | 04-07-2011 |
| 20110080131 | CONTROL DEVICE - A control device that controls a plurality of inverters respectively provided corresponding to a plurality of alternating-current electric motors so as to control the plurality of alternating-current electric motors by current feedback. The control device comprises a carrier frequency setting unit that individually selects and sets one of a plurality of carrier frequencies, each of which is a frequency of a carrier for generating switching control signals for the inverter based on a pulse width modulation method, for each of the plurality of inverters, and a switching timing table that specifies a switching timing serving as a permissible timing of switching to a different carrier frequency pair from each of a plurality of carrier frequency pairs each of which is composed of a combination of the carrier frequencies set for each of the plurality of inverters. | 04-07-2011 |
| Patent application number | Description | Published |
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| 20090033468 | RFID tag information communicating apparatus - This disclosure discloses an RFID tag information communicating apparatus, comprising an apparatus antenna device; a command transmission portion that generates and transmits a command signal for reading information from an RFID circuit element; an information acquisition portion that attempts a reception of a reply signal transmitted from said RFID circuit element in response to said command signal; and an electrostatic-safe communication control portion that controls at least said command transmission portion and repeatedly transmit a plurality of times said command signal to said RFID circuit element so that information substantially unaffected by static electricity is acquired by said information acquisition portion. | 02-05-2009 |
| 20090051500 | RFID TAG FOR AUCTION BIDS, RFID TAG COMMUNICATION SYSTEM, AUCTION SYSTEM, AND SERVER FOR AUCTION BIDS - A RFID circuit element provided with an IC circuit part that can store information and a tag antenna connected to the IC circuit part is provided, and the IC circuit part stores and holds auction site information including operator information such as login ID, password and the like and URL and the like of an auction site associated with each of a plurality of auction sites and product information such as product name/model number of a product the operator wants to successfully bid, a bidding price, quantity and the like. | 02-26-2009 |
| 20090256672 | Article management system, and portable apparatus for communicating with RFID tag - An article management system | 10-15-2009 |
| 20090295547 | RFID tag communication apparatus - This disclosure discloses an RFID tag communication apparatus comprising: a housing including a bottom surface; an antenna provided at a distance h from the bottom surface; and a radio frequency circuit including a carrier wave transmitting device that generates a carrier wave of a frequency fc; wherein the correlation as fo| 12-03-2009 | |
