Abstract: Provided is a control device for an AC rotating electric machine, which includes: a temperature detection unit configured to detect a temperature of a protection unit provided in an object to be protected when a current is supplied from a power conversion circuit including a switching element to the AC rotating electric machine and output, as a detected temperature, one of the temperature and a temperature of the object to be protected that is estimated from the temperature; a temperature compensation unit configured to calculate, through use of the detected temperature output from the temperature detection unit, a compensated temperature equal to or higher than the detected temperature; and a torque limiting unit configured to limit, through use of the compensated temperature calculated by the temperature compensation unit, a torque command value input thereto.

Abstract: A control device for an AC rotating electric machine includes: a temperature detection unit configured to detect a temperature of a protection part; a maximum current adjustment unit configured to adjust a maximum current of an AC rotating electric machine so as to prevent the temperature of the protection part from exceeding a set temperature; an allowable torque calculation unit configured to calculate an allowable torque based on the maximum current adjusted; a torque command adjustment unit configured to adjust a torque command value directed to the AC rotating electric machine based on the allowable torque; an upper limit number-of-rotation calculation unit configured to calculate an upper-limit number of rotations of the AC rotating electric machine based on the maximum current adjusted; and a number-of-rotation adjustment unit configured to adjust the number of rotations of the AC rotating electric machine based on the upper-limit number of rotations.

Abstract: An image forming apparatus includes an image forming unit configured to form an image on a sheet; a reading unit configured to read the image formed on the sheet by the image forming unit during a period in which the sheet is being conveyed by a conveying unit; a control unit configured to control a conveyance speed of the sheet by the conveying unit; and a determination unit configured to determine whether or not there is an image defect in the image formed on the sheet by the image forming unit based on image data of a first partial image read by the reading unit, excluding a second partial image passing through the reading unit during a speed variation period in which the control unit varies the conveyance speed of the sheet.

Abstract: An information processing method performs steps for an information processing apparatus to communicate with an image forming apparatus having first and second sheet output sections. The second sheet output section can be switched between a close position to serve to guide a sheet to the first sheet output section, and an open position not to guide the sheet to the first sheet output section but to stack the sheet. The method inputs a type of sheet, acquires information indicating whether the second sheet output section is in an open or closed state, and transmits image information to the image forming apparatus. When the sheet type recommends the sheet be output to the second sheet output section and the second sheet output section is in the closed state, a message is output to prompt to switch the second sheet output section into the open position before the image information is transmitted.

Abstract: To provide a controller for AC rotary electric machine which can compensate error of the actual on-duty with respect to the command on-duty calculated from command voltage with good accuracy, with a simple circuit configuration. A controller for AC rotary electric machine detects an actual on-duty of the switching device based on the detection value of the midpoint potential which is the potential of the connection node of the series connection in the series circuit; calculates an on-duty error based on the difference between the command on-duty and the actual on-duty; and corrects the voltage command or the command on-duty based on the on-duty error.

Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.

Abstract: To provide a controller for an AC rotary machine capable of performing on/off control of the switching device of the set which does not fail, by considering the state of the AC rotary machine related to the windings of the failed set. A controller for an AC rotary machine, about a set in which the switching device failed, stops dq-axis current control, and turns on, in the case of the short circuit failure, and turns off, in the case of the open circuit failure, at least the respective phase switching devices of the positive electrode side or the negative electrode side which is the same side as the failed switching device; and about a set which does not fail, continues dq-axis current control and changes the current component of the d-axis according to the state of the AC rotary machine related to the windings of the failed set.

Abstract: When the connection between a DC power source and a multigroup-multiphase electric-power conversion apparatus is cut off, a control apparatus controls switching devices so that the respective states of the two or more groups of electric-power conversion apparatuses included in the multigroup-multiphase electric-power conversion apparatus are each switched stepwise from all-phase short-circuiting state to an all-phase cutoff state at different timings.

Abstract: A temperature detection condition of a temperature detection unit used in a motor system is determined by: obtaining a phase current value flowing through a motor device and obtaining a temperature detection value; calculating, as an integrated phase current value, at least one of a first integrated phase current value, which is obtained by integrating an amount by which the phase current value exceeds a first phase current threshold, and a second integrated phase current value, which is obtained by integrating an amount by which the phase current value is smaller than a second phase current threshold that is equal to or smaller than the first phase current threshold; and determining an amount of variation in the temperature detection value detected by the temperature detection unit following the start of determination of the temperature detection condition and an amount of variation in the calculated integrated phase current value.

Abstract: An image forming apparatus includes: an image forming unit configured to form an image on a sheet; a reading unit configured to read the image formed on the sheet by the image forming unit in a duration where the sheet is being conveyed by a conveying unit; a control unit configured to control a conveyance speed of the sheet by the conveying unit; and a determination unit configured to determine whether or not there is an image defect in the image formed on the sheet by the image forming unit based on image data of a first partial image read by the reading unit, excluding a second partial image passing through the reading unit during a speed variation period in which the control unit varies the conveyance speed of the sheet.

Abstract: Provided is a control device for an AC rotating electric machine, which includes: a temperature detection unit configured to detect a temperature of a protection unit provided in an object to be protected when a current is supplied from a power conversion circuit including a switching element to the AC rotating electric machine and output, as a detected temperature, one of the temperature and a temperature of the object to be protected that is estimated from the temperature; a temperature compensation unit configured to calculate, through use of the detected temperature output from the temperature detection unit, a compensated temperature equal to or higher than the detected temperature; and a torque limiting unit configured to limit, through use of the compensated temperature calculated by the temperature compensation unit, a torque command value input thereto.

Abstract: To provide a controller for an AC rotary machine capable of performing on/off control of the switching device of the set which does not fail, by considering the state of the AC rotary machine related to the windings of the failed set. A controller for an AC rotary machine, about a set in which the switching device failed, stops dq-axis current control, and turns on, in the case of the short circuit failure, and turns off, in the case of the open circuit failure, at least the respective phase switching devices of the positive electrode side or the negative electrode side which is the same side as the failed switching device; and about a set which does not fail, continues dq-axis current control and changes the current component of the d-axis according to the state of the AC rotary machine related to the windings of the failed set.

Abstract: The n-bit decoder circuit includes 2n base circuits each outputting, as the output signal OA, ‘0’, ‘1’ or the input signal IA depending on setting of selection signals S<1:0>; and the (n?1)-bit decoder circuit. The (n?1)-bit decoder circuit includes 2(n-1) base circuits and an (n?2)-bit decoder circuit in cases of n?3, and includes the 1-bit decoder circuit in cases of n=2. The 1-bit decoder circuit outputs ‘00’ in cases of the binary input BIN<0>=‘0’ and outputs ‘01’ in cases of the binary input BIN<0>=‘1’ as thermometer outputs THM(1)<1:0>.

Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.

Abstract: A control device of an AC rotating electrical machine includes: a midpoint potential detection unit 12 that detects, for respective phases, midpoint potentials 43, 44, 45 of upper switching elements 41 and lower switching elements 42 of an inverter circuit 20; a phase current detection unit 23 that detects a phase current of each phase of an AC rotating electrical machine 3; and a CPU 11 that calculates a current estimated value Idc of DC current that is input from a DC power supply 2 to the inverter circuit 20, on the basis of the detected midpoint potential of each phase and the phase current of each phase.

Abstract: The n-bit decoder circuit includes 2n base circuits each outputting, as the output signal OA, ‘0’, ‘1’ or the input signal IA depending on setting of selection signals S<1:0>; and the (n-1)-bit decoder circuit. The (n-1)-bit decoder circuit includes 2(n-1) base circuits and an (n-2)-bit decoder circuit in cases of n 3, and includes the 1-bit decoder circuit in cases of n=2. The 1-bit decoder circuit outputs ‘00’ in cases of the binary input BIN<0>=‘0’ and outputs ‘01’ in cases of the binary input BIN<0>=‘1’ as thermometer outputs THM(1)<1:0>.

Abstract: When the connection between a DC power source and a multigroup-multiphase electric-power conversion apparatus is cut off, a control apparatus controls switching devices so that the respective states of the two or more groups of electric-power conversion apparatuses included in the multigroup-multiphase electric-power conversion apparatus are each switched stepwise from a phase short-circuiting state to an all-phase cutoff state at different timings.

Abstract: An image forming apparatus includes a housing unit that includes an intermediate plate, a lift-up unit, a first detection unit, a second detection unit, a feeding unit, a control unit, a first acquisition unit that acquires a first driving amount, a storage unit that stores a threshold, a determination unit that determines that a recording material is overloaded on the intermediate plate when the first driving amount is smaller than the threshold, a second acquisition unit that acquires a second driving amount, a correction unit that obtains a differential amount by subtracting a predetermined driving amount from the second driving amount acquired by the second acquisition unit, and corrects, on a basis of the differential amount, the threshold stored in the storage unit or the first driving amount acquired by the first acquisition unit.

Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.

Abstract: An AC-rotating-electric-machine control apparatus includes two or more electric-power conversion circuits that control respective voltages to be applied to the two or more groups of multi-phase armature windings, for each of the two or more groups of multi-phase armature windings; each of the two or more electric-power conversion circuits has two or more switching devices for opening or closing the corresponding group of multi-phase armature windings, for each of the phases; the two or more switching devices are switching-controlled in such a way that opening operation or duty control can be applied to the corresponding group of multi-phase armature windings.