Patent application number | Description | Published |
20090091281 | MOTOR DRIVING APPARATUS - A motor driving apparatus having a converter, which receives AC voltage and converts it to DC power, and an inverter, which receives the DC power and converts it to AC power, includes a charge/discharge control circuit and a capacitor connected in parallel to a link section between the converter and the inverter, and energy stored in the capacitor C | 04-09-2009 |
20090218976 | MOTOR DRIVING APPARATUS - A motor driving apparatus comprises a charge/discharge control circuit for controlling charge to or discharge from a capacitor connected in parallel in a link section between a converter and an inverter, and a current control means for controlling discharge current from the charge/discharge control circuit. The current control means controls discharge current from the charge/discharge control circuit based on input current to the inverter or output current from the converter so that output current from the converter is equal to a prescribed value. | 09-03-2009 |
20090237016 | MOTOR CONTROLLER - A motor controller capable of effectively utilizing electrical energy accumulated in a capacitor and achieving a reduction in capacitance of the capacitor. The motor controller includes a converter that receives an input AC voltage and performs AC-to-DC power conversion thereon, an inverter that receives DC power and performs DC-to-AC conversion thereon, and a capacitor and a charging/discharging control circuit connected in parallel with a DC link between the converter and the inverter. Electrical energy is supplied from the capacitor to the DC link via the charging/discharging control circuit. The charging/discharging control circuit has a circuit for discharging electrical energy accumulated in the capacitor and for stepping up a voltage of the capacitor when discharging the electrical energy. | 09-24-2009 |
20110238338 | MOTOR DRIVING APPARATUS EASILY ANALYZABLE FOR CAUSE OF FAULT - Disclosed is a motor driving apparatus in which provisions are made so as to easily isolate the cause of a fault in the event of the occurrence thereof. The voltage and current in each phase of the AC power being supplied to a converter are detected, and the most recently detected data are stored in a power supply monitoring unit for a predetermined period of time. If an alarm occurs in the converter, inverter, or controller, the data currently held in the power supply monitoring unit are recorded in a recording unit. By displaying the thus recorded data, one can easily identify whether the cause of the alarm is due to the power supply or the motor driving apparatus itself. | 09-29-2011 |
20120068636 | MOTOR DRIVING APPARATUS - When the output of motor reaches or exceeds a predetermined value during acceleration of the motor, the control target value of the DC link voltage which is the voltage of a power storage device is gradually lowered in corresponding relationship to the motor output. When the motor enters a constant speed control mode, the DC link control target value is maintained at a constant level. When the motor enters a deceleration control mode, the DC link control target value is gradually raised in corresponding relationship to the motor output, and regenerative power is recovered by the power storage device and reused in the next control cycle. | 03-22-2012 |
20120068637 | MOTOR DRIVING APPARATUS - During motor acceleration control period that starts at time T | 03-22-2012 |
20120326641 | MOTOR DRIVE APPARATUS EQUIPPED WITH ENERGY STORAGE UNIT - 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. | 12-27-2012 |
20140021888 | MOTOR DRIVING DEVICE INCLUDING ELECTRIC STORAGE DEVICE - 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. | 01-23-2014 |
20140306634 | MOTOR CONTROL DEVICE PROVIDED WITH POWER FAILURE MANAGEMENT - 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. | 10-16-2014 |