Abstract: A selection device includes: a storage unit storing a plurality of types of amplifiers in advance; an acquisition unit for acquiring a plurality of selected amplifiers selected for driving a plurality of designated motors designated in advance; an alignment order selection unit for selecting a predetermined arrangement order in which the plurality of selected amplifiers are arranged adjacent to each other in the width direction on the basis of the types of the plurality of selected amplifiers; and a display control unit for causing a display unit to display the predetermined arrangement order.

Abstract: A motor drive device 1 is provided with: a converter unit 11 which converts input alternating-current power into direct-current power and outputs the same to a DC link; a DC link capacitor 4; voltage dividing resistors 13-1, 13-2 which are connected in series with one another and which are provided between a positive potential line and a negative potential line of the DC link; a measurement resistor 14 connected between the connecting point of the voltage dividing resistors 13-1 and 13-2 and the positive potential line or the negative potential line of the DC link; a resistance voltage measuring unit 15 for measuring the resistance voltage across the measurement resistor 14; a direct current component extracting unit 16 for extracting the direct current component of the resistance voltage; an alternating current component extracting unit 17 for extracting the alternating current component of the resistance voltage; a DC link potential measuring unit 18 for measuring the positive potential and the negative pot

Abstract: Provided are a selection device and a selection method in which it is easy for an operator to select a motor and an amplifier while taking an auxiliary function and a compliance standard into consideration.

Abstract: Provided are a selection device and a selection method for enabling an operator to efficiently select an amplifier capable of driving a motor having a desired performance, said selection being made from the perspective of the number of amplifiers installed, the price, or the installation space.

Abstract: A servo amplifier selection device includes a memory configured to store specifications of each of a plurality of amplifiers capable of supplying power to a motor; and a processor configured to select, based on the number of one or more designated motors, specifications of each of the one or more designated motors, and specifications of each of the plurality of amplifiers, a combination of amplifiers connected to the one or more designated motors from the plurality of amplifiers in such a way that each of the one or more designated motors is connected to any of the plurality of amplifiers; and select, for each amplifier included in the combination of the amplifiers, specifications of a power cable that connects between the amplifier and a power source in such a way as to satisfy a supply of power needed for the motor connected to the amplifier.

Abstract: A machine state monitoring device is a machine state monitoring device that is intended for a motor drive device of a machine tool. The motor drive device includes: a motor; a converter and an inverter that adjust a power supply voltage; a power failure detection unit that acquires an input voltage of the motor drive device so as to detect a power failure in the motor drive device; and a communication unit that transmits, based on the result of the detection of the detection unit, a time when the power failure is started, and a time when the power failure is completed. The machine state monitoring device includes: a communication unit that receives information of the time when the power failure is started and the time when the power failure is completed from the communication unit of the motor drive device; and a storage unit that stores the information.

Abstract: A power conversion apparatus includes: a converter including switching elements and configured to convert an AC voltage supplied from an AC power supply through a switch unit into a DC voltage; a filter provided between the switch unit and the converter and including reactors and capacitors, the filter being configured to remove noise; and a control unit configured to discharge electric charge stored in the capacitors by setting the switching elements into an ON state after opening the switch unit.

Abstract: A power conversion apparatus includes: a converter converting AC voltage supplied from an AC power supply via a switch unit, into DC voltage; a smoothing capacitor smoothing the DC voltage output from the converter; a resistor suppressing electric current flowing into the smoothing capacitor; a switch short-circuiting the both ends of the resistor; a filter including reactors and capacitors and that removes noise; and a control unit controlling opening and closing of the switch unit and the switch. The control unit changes the switch unit from the open state to the closed state with the switch in an open state if the voltage across the smoothing capacitor is lower than a voltage threshold, and changes the switch unit from the open state to the closed state with the switch in an closed state if the voltage across the smoothing capacitor is equal to or greater than the voltage threshold.

Abstract: A power conversion apparatus includes: a converter including switching elements and configured to convert an AC voltage supplied from an AC power supply through a switch unit into a DC voltage; a filter provided between the switch unit and the converter and including reactors and capacitors, the filter being configured to remove noise; and a control unit configured to discharge electric charge stored in the capacitors by setting the switching elements into an ON state after opening the switch unit.

Abstract: A servo amplifier selection device includes a memory configured to store specifications of each of a plurality of amplifiers capable of supplying power to a motor; and a processor configured to select, based on the number of one or more designated motors, specifications of each of the one or more designated motors, and specifications of each of the plurality of amplifiers, a combination of amplifiers connected to the one or more designated motors from the plurality of amplifiers in such a way that each of the one or more designated motors is connected to any of the plurality of amplifiers; and select, for each amplifier included in the combination of the amplifiers, specifications of a power cable that connects between the amplifier and a power source in such a way as to satisfy a supply of power needed for the motor connected to the amplifier.

Abstract: A power conversion apparatus includes: a converter converting AC voltage supplied from an AC power supply via a switch unit, into DC voltage; a smoothing capacitor smoothing the DC voltage output from the converter; a resistor suppressing electric current flowing into the smoothing capacitor; a switch short-circuiting the both ends of the resistor; a filter including reactors and capacitors and that removes noise; and a control unit controlling opening and closing of the switch unit and the switch. The control unit changes the switch unit from the open state to the closed state with the switch in an open state if the voltage across the smoothing capacitor is lower than a voltage threshold, and changes the switch unit from the open state to the closed state with the switch in an closed state if the voltage across the smoothing capacitor is equal to or greater than the voltage threshold.

Abstract: A machine state monitoring device is a machine state monitoring device that is intended for a motor drive device of a machine tool. The motor drive device includes: a motor; a converter and an inverter that adjust a power supply voltage; a power failure detection unit that acquires an input voltage of the motor drive device so as to detect a power failure in the motor drive device; and a communication unit that transmits, based on the result of the detection of the detection unit, a time when the power failure is started, and a time when the power failure is completed. The machine state monitoring device includes: a communication unit that receives information of the time when the power failure is started and the time when the power failure is completed from the communication unit of the motor drive device; and a storage unit that stores the information.

Abstract: A power failure detection unit in an AC-DC converter device detects power failure of a 3-phase AC power supply at the time of driving a motor, and generates a power failure detection signal in accordance with detection of power failure. A transmitter unit in the AC-DC converter device transmits the power failure detection signal using a cable, radio, or an optical fiber. A receiver unit in a DC-AC converter device receives the power failure detection signal transmitted from the transmitter unit.

Abstract: A motor drive of an embodiment of the present invention includes a PWM converter for converting AC power inputted from a low voltage AC power source into DC power by PWM control, an inverter for converting the received DC power to AC power to drive a motor, and a capacitor connected between the PWM converter and the inverter. The PWM converter is operated so as to limit input and output currents or input and output power to predetermined values, and supplied from the low voltage AC power source with a lower voltage than a voltage required to drive the motor. The PWM converter boosts a DC link voltage being an output voltage to the voltage able to drive the motor, and thereby serves to increase the potential difference of the capacitor between charged and discharged states to reduce the capacitance of the capacitor.

Abstract: A motor drive of an embodiment of the present invention includes a PWM converter for converting AC power inputted from a low voltage AC power source into DC power by PWM control, an inverter for converting the received DC power to AC power to drive a motor, and a capacitor connected between the PWM converter and the inverter. The PWM converter is operated so as to limit input and output currents or input and output power to predetermined values, and supplied from the low voltage AC power source with a lower voltage than a voltage required to drive the motor. The PWM converter boosts a DC link voltage being an output voltage to the voltage able to drive the motor, and thereby serves to increase the potential difference of the capacitor between charged and discharged states to reduce the capacitance of the capacitor.

Abstract: A motor driving device includes a rectifier, an inverter connected to a DC link on a DC side of the rectifier, a power failure detecting unit for detecting a power failure on the alternating side of the rectifier, an electric storage device connected to the DC link, a charging unit that possesses a voltage boosting function of charging the electric storage device by direct current power at the DC link, a discharging unit that causes direct current power stored in the electric storage device to be discharged to the DC link, and a control unit that causes the charging unit to operate when the power failure detecting unit does not detect a power failure, or before start of motor drive, and causes the discharging unit and the inverter to operate when the power failure detecting unit detects a power failure.

Abstract: A motor drive apparatus includes an AC/DC converter which converts AC power supplied from a power supply to DC power, a DC/AC converter which converts DC power to AC power and vice versa, a DC link unit which connects the DC side of the AC/DC converter to the DC side of the DC/AC converter and delivers the DC power from one to the other and vice versa, an energy storage unit which includes at least one capacitor storage unit and at least one flywheel storage unit each of which is connected to the DC link unit and stores or supplies the DC power, and an energy control unit which performs control so that the energy storage unit stores or supplies the DC power.

Abstract: A power failure detection unit in an AC-DC converter device detects power failure of a 3-phase AC power supply at the time of driving a motor, and generates a power failure detection signal in accordance with detection of power failure. A transmitter unit in the AC-DC converter device transmits the power failure detection signal using a cable, radio, or an optical fiber. A receiver unit in a DC-AC converter device receives the power failure detection signal transmitted from the transmitter unit.

Abstract: A motor drive device (1) of the present invention includes a converter unit (10) and an inverter unit (30). The converter unit (10) includes: power supply voltage monitoring unit (3) for detecting a power failure; DC link voltage detecting means (4); capacitor total capacity calculating means (6) which calculates total capacity of DC link smoothing capacitors (17, 18) and calculates a DC link low-voltage alarm detection level for an instantaneous power failure; DC link low-voltage alarm detection level setting means (8) which varies the DC link low-voltage alarm detection level for an instantaneous power failure as necessary; and alarm generating means (7) which monitors the DC link voltage and generates an alarm to protect the converter unit. In the case where a power failure is detected, the DC link low-voltage alarm detection level is increased in accordance with the total capacity of the DC link smoothing capacitors (17, 18).

Abstract: A motor driving device includes a rectifier, an inverter connected to a DC link on a DC side of the rectifier, a power failure detecting unit for detecting a power failure on the alternating side of the rectifier, an electric storage device connected to the DC link, a charging unit that possesses a voltage boosting function of charging the electric storage device by direct current power at the DC link, a discharging unit that causes direct current power stored in the electric storage device to be discharged to the DC link, and a control unit that causes the charging unit to operate when the power failure detecting unit does not detect a power failure, or before start of motor drive, and causes the discharging unit and the inverter to operate when the power failure detecting unit detects a power failure.