Abstract: A power conversion device comprising, a power converter that outputs signal to the motor to vary the motor's output frequency, output voltage and output current and control unit that controls the power converter, the control unit is, calculating the first power from the output voltage and output current, calculating the second power from the output current, electrical circuit parameters and frequency estimates, calculating the first phase error estimate so that the first power follows the second power in the first frequency domain, calculating the second phase error estimate different from the first frequency domain in a second frequency domain, controlling the frequency estimates so that the first phase error estimate or the second phase error estimate follows the command value of the phase error estimate.

Abstract: This power conversion device comprises: a power converter including a switching element; and a control unit which controls the power converter. The control unit calculates a torque electric current detection value and an excitation electric current detection value from an electric current flowing to an external device, and when an absolute value of the torque electric current detection value is greater than or equal to the excitation electric current detection value, performs control such that the excitation electric current detection value follows the torque electric current detection value.

Abstract: A power conversion device includes a harmonic voltage generation unit that superimposes dc-axis and qc-axis harmonic voltages on dc-axis and qc-axis voltage commands in accordance with a switching signal; and an inductance estimation unit that estimates dc-axis inductance and qc-axis inductance on a basis of dc-axis and qc-axis harmonic currents, amplitude values of the harmonic voltages, and the switching signal.

Abstract: This power conversion device comprises: a power converter including a switching element; and a control unit which controls the power converter. The control unit calculates a torque electric current detection value and an excitation electric current detection value from an electric current flowing to an external device, and when an absolute value of the torque electric current detection value is greater than or equal to the excitation electric current detection value, performs control such that the excitation electric current detection value follows the torque electric current detection value.

Abstract: An image forming apparatus includes: an extraction unit configured to extract an image for position detection from job image data; a first image forming unit configured to form the image for position detection on a recording medium; a second image forming unit disposed on a downstream in a feeding direction of the recording medium relative to the first image forming unit; a first detection unit configured to detect the image for position detection formed by the first image forming unit; and a determining unit configured to determine a correction amount of an image forming position of the second image forming unit based on a position of the image for position detection that is detected by the detection unit and a position of the image for position detection in the image data.

Abstract: An image forming apparatus includes: an extraction unit configured to extract an image for position detection from job image data; a first image forming unit configured to form the image for position detection on a recording medium; a second image forming unit disposed on a downstream in a feeding direction of the recording medium relative to the first image forming unit; a first detection unit configured to detect the image for position detection formed by the first image forming unit; and a determining unit configured to determine a correction amount of an image forming position of the second image forming unit based on a position of the image for position detection that is detected by the detection unit and a position of the image for position detection in the image data.

Abstract: An ejection apparatus includes: a first ejection unit configured to eject droplets on a recording medium conveyed in a conveyance direction to form an image for detection; a first detection unit disposed downstream of the first ejection unit and configured to detect the image for detection; a second ejection unit disposed downstream of the detection unit and configured to eject droplets on the recording medium; and a control unit configured to: predict a first elongation amount of the recording medium based on a first difference between a first set time period and a first detection time period from a reference time point to a first detection time point when the image for detection is detected by the first detection unit; and perform delay control on the second ejection unit for delaying an ejection timing of the second ejection unit based on the predicted elongation amount.

Abstract: An image processing apparatus includes a processor. The processor is configured to set an image position of a reference image in a transport direction of a recording medium to an arbitrary position on a specific page of the recording medium. The reference image is formed using a first color and serves as a reference for an image position of an image of a second color to be formed after the image of the first color is formed. The processor is also configured to adjust the image position for the second color on an adjacent page, located adjacently upstream of the specific page in the transport direction, by using image information of the reference image formed on the specific page.

Abstract: An image forming apparatus includes an image forming unit, first and second detectors, and a corrector. The image forming unit includes first and second image forming units disposed downstream of the first unit in a transport direction of a recording medium and causes the first and second units to form predetermined correction images onto the recording medium. The first detector is disposed downstream of the first unit and upstream of the second unit in the transport direction, and detects the correction image formed by the first unit. The second detector is disposed downstream of the second unit in the transport direction and detects the correction image formed by the second unit. The corrector corrects an image position of the second unit in a width direction of the recording medium by using the correction images formed by the first and second units and detected by the first and second detectors.

Abstract: A power conversion device includes a harmonic voltage generation unit that superimposes dc-axis and qc-axis harmonic voltages on dc-axis and qc-axis voltage commands in accordance with a switching signal; and an inductance estimation unit that estimates dc-axis inductance and qc-axis inductance on a basis of dc-axis and qc-axis harmonic currents, amplitude values of the harmonic voltages, and the switching signal.

Abstract: An ejection apparatus includes: a first ejection unit configured to eject droplets on a recording medium conveyed in a conveyance direction to form an image for detection; a first detection unit disposed downstream of the first ejection unit and configured to detect the image for detection; a second ejection unit disposed downstream of the detection unit and configured to eject droplets on the recording medium; and a control unit configured to: predict a first elongation amount of the recording medium based on a first difference between a first set time period and a first detection time period from a reference time point to a first detection time point when the image for detection is detected by the first detection unit; and perform delay control on the second ejection unit for delaying an ejection timing of the second ejection unit based on the predicted elongation amount.

Abstract: An image forming apparatus includes an image forming unit, first and second detectors, and a corrector. The image forming unit includes first and second image forming units disposed downstream of the first unit in a transport direction of a recording medium and causes the first and second units to form predetermined correction images onto the recording medium. The first detector is disposed downstream of the first unit and upstream of the second unit in the transport direction, and detects the correction image formed by the first unit. The second detector is disposed downstream of the second unit in the transport direction and detects the correction image formed by the second unit. The corrector corrects an image position of the second unit in a width direction of the recording medium by using the correction images formed by the first and second units and detected by the first and second detectors.

Abstract: An image processing apparatus includes a processor. The processor is configured to set an image position of a reference image in a transport direction of a recording medium to an arbitrary position on a specific page of the recording medium. The reference image is formed using a first color and serves as a reference for an image position of an image of a second color to be formed after the image of the first color is formed. The processor is also configured to adjust the image position for the second color on an adjacent page, located adjacently upstream of the specific page in the transport direction, by using image information of the reference image formed on the specific page.

Abstract: An ejection apparatus includes: a feeding unit that feeds a recording medium; a first ejection unit that ejects droplets onto the recording medium to form plural detection images along a feeding direction of the recording medium, a detection unit that detects a distance from a predetermined origin of the recording medium to each of the detection images along the feeding direction; and a second ejection unit that is disposed on a downstream side relative to the first ejection unit in the feeding direction of the recording medium, and ejects droplets onto the recording medium at a timing based on a value obtained by adding an average value of differences between detection values of the detection unit and setting values to a setting value of the detection image on most downstream side in the feeding direction.

Abstract: An ejection apparatus includes: a feeding unit that feeds a recording medium; a first ejection unit that ejects droplets onto the recording medium to form plural detection images along a feeding direction of the recording medium, a detection unit that detects a distance from a predetermined origin of the recording medium to each of the detection images along the feeding direction; and a second ejection unit that is disposed on a downstream side relative to the first ejection unit in the feeding direction of the recording medium, and ejects droplets onto the recording medium at a timing based on a value obtained by adding an average value of differences between detection values of the detection unit and setting values to a setting value of the detection image on most downstream side in the feeding direction.

Abstract: A printing apparatus includes: a first driving portion transporting a paper sheet; a printing portion being disposed on an upstream side of the first driving portion in a transporting direction of the transported paper sheet, including a plurality of aligned ejection ports ejecting liquid onto the transporting paper sheet to print an image on the paper sheet by the liquid; a drawing portion being disposed on an upstream side of the printing portion in the transporting direction, drawing the paper sheet of which a tip end is placed at a preset position, and feeding the paper sheet to a transporting path via the printing portion and the first driving portion; and a guiding portion being interposed between the printing portion and the first driving portion in the transporting direction, and when feeding the paper sheet, freely reciprocating between a first position and a second position.

Abstract: A sheet-edge detecting device includes first and second detecting units and a determining unit. The detecting units are disposed at an edge of a sheet having feed holes in a direction crossing a transporting direction of the sheet, and are separated from each other in the transporting direction so as not to be positioned in one or more feed holes simultaneously. In the direction crossing the transporting direction, the detecting units are separated from each so as not to be positioned in a feed hole and outside the edge simultaneously, one of the detecting units is at a position corresponding to an allowable displacement of the edge, and the other detecting unit is at the same position as the one of the detecting units or closer to the edge than the one of the detecting units is. The determining unit determines the position of the edge of the sheet.

Abstract: A printing apparatus includes: a first driving portion transporting a paper sheet; a printing portion being disposed on an upstream side of the first driving portion in a transporting direction of the transported paper sheet, including a plurality of aligned ejection ports ejecting liquid onto the transporting paper sheet to print an image on the paper sheet by the liquid; a drawing portion being disposed on an upstream side of the printing portion in the transporting direction, drawing the paper sheet of which a tip end is placed at a preset position, and feeding the paper sheet to a transporting path via the printing, portion and the first driving portion; and a guiding portion being interposed between the printing portion and the first driving portion in the transporting direction, and when feeding the paper sheet, freely reciprocating between a first position and a second position.

Abstract: Disclosed is a motor control apparatus for controlling a synchronous motor, which includes a receiver section for receiving the value detected by a temperature sensor installed inside the synchronous motor. The synchronous motor is started up with the current fed into it, whose magnitude is changed in accordance with the temperature received by the receiver section at the time of starting up the synchronous motor. In this way, the stable startup of the synchronous motor can be guaranteed and the useful life of the semiconductor elements can also be prolonged.

Abstract: A sheet-edge detecting device includes first and second detecting units and a determining unit. The detecting units are disposed at an edge of a sheet having feed holes in a direction crossing a transporting direction of the sheet, and are separated from each other in the transporting direction so as not to be positioned in one or more feed holes simultaneously. In the direction crossing the transporting direction, the detecting units are separated from each so as not to be positioned in a feed hole and outside the edge simultaneously, one of the detecting units is at a position corresponding to an allowable displacement of the edge, and the other detecting unit is at the same position as the one of the detecting units or closer to the edge than the one of the detecting units is. The determining unit determines the position of the edge of the sheet.