Abstract: A power conversion apparatus includes a converter that rectifies a first AC voltage supplied from an AC source, a capacitor that is connected to an output end of the converter and smooths a first DC voltage rectified by the converter into a second DC voltage including a first ripple, an inverter that is connected across the capacitor and converts the second DC voltage into a second AC voltage corresponding to a desired frequency, and a voltage detection unit that acquires a physical quantity correlated with the second DC voltage, and controls the second AC voltage to superimpose a second ripple correlated with the first ripple on an output voltage of the inverter.

Abstract: A suction flow path of a screw compressor includes a male-side flow path that opens in an axial direction with respect to working chambers in a suction process on the male rotor side and extends from a starting end positioned on one side of a virtual plane to a first termination end positioned on the other side; and a female-side flow path on the female rotor side that extends from the starting end to a second termination end positioned on the other side of the virtual plane. The male-side or the female-side first flow path wall is configured such that at least a partial area in a range from the starting end to the first or the second termination end is closer to a male-side or female-side rotor lobe section from the starting end side toward the first or second termination end side.

Abstract: A drive device (100) includes a power converter (2), a magnetic pole position identification unit (5a), a magnetic pole position identification unit (5b), a subtractor (8), and a current control unit (6). The power converter (2) supplies power to a main-side synchronous motor (1a) and a sub-side synchronous motor (1b) connected in parallel. The subtractor (8) obtains an angular difference (?) using the magnetic pole position of the rotor of the main-side synchronous motor (1a) identified by the magnetic pole position identification unit (5a) and the magnetic pole position of the rotor of the sub-side synchronous motor (1b) identified by the magnetic pole position identification unit (5b). A magnetic flux current command compensation unit (10) adjusts the absolute value of a magnetic flux current command (id*) based on the angular difference (?).

Abstract: A power conversion device includes: a switching signal generator configured to generate a switching signal to output, from an inverter circuit, an AC voltage corresponding to a designated phase; a speed estimator configured to estimate an estimated phase of a rotor of a motor based on a current flowing through the motor; and a beat suppression controller configured to output an adjusted phase to the switching signal generator so as to suppress a beat component superimposed on the current flowing through the motor, the adjusted phase being obtained by adjusting the estimated phase.

Abstract: A drive device includes a power converter, a first magnetic pole position identification unit, a second magnetic pole position identification unit, a subtractor, and a current control unit. The power converter supplies power to a main-side synchronous motor and a sub-side synchronous motor connected in parallel. The subtractor obtains an angular difference using the magnetic pole position of the rotor of the main-side synchronous motor identified by the first magnetic pole position identification unit and the magnetic pole position of the rotor of the sub-side synchronous motor identified by the second magnetic pole position identification unit. A magnetic flux current command compensation unit adjusts the absolute value of a magnetic flux current command based on the angular difference. The current control unit controls the power converter using a torque current command and the magnetic flux current command with the absolute value adjusted by the magnetic flux current command compensation unit.

Abstract: A power converting apparatus includes a rectifier unit that rectifies first alternating-current power supplied from a commercial power supply, a capacitor connected to an output end of the rectifier unit, an inverter connected across the capacitor to generate second alternating-current power and output the second alternating-current power to a motor, and a control unit that controls an operation of the inverter and an operation of the motor using a dq-rotational coordinate system rotating in synchronization with a rotor position of the motor. The control unit extracts multiple frequency components from a q-axis current pulsation, which is a pulsatile component of a q-axis current, and limits the amplitude value of each of the extracted frequency components to control the amplitude of the q-axis current pulsation.

Abstract: A power conversion apparatus includes: a rectifying unit that rectifies an AC voltage input from an AC power supply to convert the AC voltage into a DC link voltage; a capacitor that is charged with a DC link voltage converted by the rectifying unit; a power application unit that converts the DC link voltage with which the capacitor is charged into an AC voltage by switching the DC link voltage, and outputs the AC voltage to a motor; and a control unit that controls the power application unit. The control unit controls the power application unit such that a second beat is superimposed on a motor current, the second beat having a second frequency different from a first beat having a first frequency included in the motor current and having at least one of an amplitude or a phase aligned with the first beat.

Abstract: A power conversion device (100) includes: a switching signal generator (7) configured to generate a switching signal to output, from an inverter circuit (5), an AC voltage corresponding to a designated phase; a speed estimator (8) configured to estimate an estimated phase of a rotor of a motor (2) based on a current flowing through the motor (2); and a beat suppression controller (10) configured to output an adjusted phase to the switching signal generator (7) so as to suppress a beat component superimposed on the current flowing through the motor (2), the adjusted phase being obtained by adjusting the estimated phase.

Abstract: A drive device for an AC motor includes: an adaptive observation unit that adaptively estimates an angular velocity of a rotor of an AC motor; a speed control unit that determines a first torque command with which an angular velocity command matches an average value of an estimated angular velocity; a phase lead amount calculation unit that calculates, based on a disturbance frequency, a phase lead amount of a transfer function from a true angular velocity to a model deviation; a vibration suppression control unit that determines, based on a frequency of load torque pulsations, the model deviation, and the phase lead amount, a second torque command with which speed pulsations in the AC motor are suppressed; and a torque control unit that controls a torque of the AC motor based on the first torque command and the second torque command.

Abstract: A drive device for an AC motor includes: an adaptive observation unit that adaptively estimates an angular velocity of a rotor of an AC motor; a speed control unit that determines a first torque command with which an angular velocity command matches an average value of an estimated angular velocity; a phase lead amount calculation unit that calculates, based on a disturbance frequency, a phase lead amount of a transfer function from a true angular velocity to a model deviation; a vibration suppression control unit that determines, based on a frequency of load torque pulsations, the model deviation, and the phase lead amount, a second torque command with which speed pulsations in the AC motor are suppressed; and a torque control unit that controls a torque of the AC motor based on the first torque command and the second torque command.

Abstract: A load driving apparatus includes first and second motors that drive a plurality of loads on a one-to-one basis, and an inverter that applies a common voltage to the first and second motors. The first motor is vector-controlled by a control unit. The second motor is driven by the common voltage. The ratio of the winding resistance value of the second motor to the winding resistance value of the first motor as a reference motor is 2.4 or more.

Abstract: A fluid machine that performs efficient cooling of a control system, such as a control device. The fluid machine is provided with: a fluid machine body; a drive source; a control device; a housing in which the fluid machine body, the drive source, and the control device are housed; and a cooling fan. The housing has a plurality of intake openings for introducing cooling air into the interior thereof and one exhaust opening, and includes a partition wall which partitions the interior of the housing into a first compartment and a second compartment and which has a communication portion providing communication between the first compartment and a part of the second compartment. A first intake opening among the plurality of intake openings is disposed in a housing wall of the first compartment in which at least the control device is disposed, and a second intake opening is disposed in a housing wall of the second compartment in which at least the drive source is disposed.

Abstract: A fluid machine that performs efficient cooling of a control system, such as a control device. The fluid machine is provided with: a fluid machine body; a drive source; a control device; a housing in which the fluid machine body, the drive source, and the control device are housed; and a cooling fan. The housing has a plurality of intake openings for introducing cooling air into the interior thereof and one exhaust opening, and includes a partition wall which partitions the interior of the housing into a first compartment and a second compartment and which has a communication portion providing communication between the first compartment and a part of the second compartment. A first intake opening among the plurality of intake openings is disposed in a housing wall of the first compartment in which at least the control device is disposed, and a second intake opening is disposed in a housing wall of the second compartment in which at least the drive source is disposed.

Abstract: [Problem] The present invention has as an object to reduce the occurrence of jamming of sheet within a sheet handling device. [Solution] The sheet handling device comprises an input/output section having the function of stacking sheets and configured to accept and dispense sheets from the sheet handling device; a storing unit configured to store sheets; a transport path allocated between the storing unit and the input/output section and configured to transport sheets; a determination section allocated on the transport path and configured to determine transport condition of sheets being transported; and a controller that, in the event that the determination section determines improper transport condition of a sheet being transported from the storing unit to the input/output section by the transport path, controls the transport path so as to store the sheet in the storing unit.

Abstract: [Problem] The present invention has as an object to reduce the occurrence of jamming of sheet within a sheet handling device. [Solution] The sheet handling device comprises an input/output section having the function of stacking sheets and configured to accept and dispense sheets from the sheet handling device; a storing unit configured to store sheets; a transport path allocated between the storing unit and the input/output section and configured to transport sheets; a determination section allocated on the transport path and configured to determine transport condition of sheets being transported; and a controller that, in the event that the determination section determines improper transport condition of a sheet being transported from the storing unit to the input/output section by the transport path, controls the transport path so as to store the sheet in the storing unit.

Abstract: An automated teller machine having a customer operation part, a deposit/payment port to put into bills, a distinction part which distinguishes bill, storages which stores bill, a storage box which keeps bill decided to be true bill at the distinction part among bills put into the deposit/payment port, and a main control part which pays out bills from the storages with true bills kept in the storage box, stores rejected bills in the storage box when the amount of money put into the deposit/payment port is greater than the amount input at the customer operation part. The machine idle-rotates a drum type temporary storage box without winding bill when the amount of true bill is greater than the payment amount input at the customer operation part.

Abstract: When using an inexpensive deposit box in a provided bill handling apparatus, bills that can be deposited are increased irrespective of a limit in the number of bills that can be stacked in the deposit box. In a bill handling apparatus including a bill deposit/withdrawal port for depositing/withdrawing bills, a bill discrimination section for discriminating bills, a temporary storage box for temporarily storing bills, a deposit box for accepting reject bills and bills other than pertinent bill kinds, bill acceptance boxes for accepting the pertinent bill kinds, bill transport paths for transporting bills, and a main control section for controlling the whole apparatus, the number of bills that can be deposited is increased by providing a section for counting bills transported to the deposit box and a section for temporarily stopping bill separation from the temporary storage box.

Abstract: It is intended to make possible informing, at the time of maintenance for regular inspection or the like, personnel in charge of any part where a trouble is predictable to enable them to perform inspection or maintenance before the trouble occurs and thereby to reduce the duration the failure of the apparatus. A bill handling apparatus is provided with a conveyance path for conveying bills among a deposit/withdrawal unit, bill boxes, a rejected bill box and a temporary stocking box, wherein sensors for detecting passage of the bills are arranged on the conveyance path, and there are further provided a conveyance monitoring/control unit for monitoring a conveyance status of the bills in each of sensor sections on the conveyance path on the basis of front end passage times and rear end passage times of the bills at the sensors and a display device for perceivably outputting a result of monitoring by the conveyance monitoring/control unit.

Abstract: When using an inexpensive deposit box in a provided bill handling apparatus, bills that can be deposited are increased irrespective of a limit in the number of bills that can be stacked in the deposit box. In a bill handling apparatus including a bill deposit/withdrawal port for depositing/withdrawing bills, a bill discrimination section for discriminating bills, a temporary storage box for temporarily storing bills, a deposit box for accepting reject bills and bills other than pertinent bill kinds, bill acceptance boxes for accepting the pertinent bill kinds, bill transport paths for transporting bills, and a main control section for controlling the whole apparatus, the number of bills that can be deposited is increased by providing a section for counting bills transported to the deposit box and a section for temporarily stopping bill separation from the temporary storage box.

Abstract: An automated teller machine having a customer operation part, a deposit/payment port to put into bills, a distinction part which distinguishes bill, storages which stores bill, a storage box which keeps bill decided to be true bill at the distinction part among bills put into the deposit/payment port, and a main control part which pays out bills from the storages with true bills kept in the storage box, stores rejected bills in the storage box when the amount of money put into the deposit/payment port is greater than the amount input at the customer operation part. The machine idle-rotates a drum type temporary storage box without winding bill when the amount of true bill is greater than the payment amount input at the customer operation part.