| 摘要 |
PURPOSE: To perform automatic landing operation in case of power failure of a commercial power supply while protecting a power supply for emergency by detecting a current-equivalent value and a voltage-equivalent value of an induction motor, and controlling an operation speed of an elevator based on the current-equivalent value and the voltage-equivalent value of the induction motor in automatic landing operation. CONSTITUTION: When a commercial AC power supply 10 fails, a contactor coil 11 is deenergized to put a contactor contact 11b on, and a drive command is generated to an auxiliary inverter device 23. In the auxiliary inverter device 23, power of a power supply (battery) 20 for emergency is converted into three- phase AC, and after a DC power is supplied to an inverter 17 at a specified time after that, so the three-phase AC power is supplied to a control circuit 30. The control circuit 30 takes deviation between a speed command and a detected speed V to perform integrating operation for calculating a current command and a frequency command, it takes deviation between a current command value and a detected current I to perform integrating operation to calculate a voltage command, and it outputs a pulse signal, based on the voltage command value and the frequency command value to control the inverter 17. |
