| 摘要 |
This invention provides a controller of an elevator capable of performing stable speed control by using a cheap power accumulating device of a low capacity even at a discharging control time. Therefore, the controller has a converter 2, an inverter 4, a power accumulating device 11 arranged between DC buses 3, a charging-discharging control circuit 15 for controlling charging and discharging operations of the power accumulating device, a power failure detector 22, a current measuring instrument 23 and a voltage measuring instrument 24 for respectively detecting an output current and an output voltage of the inverter, a car load measuring instrument 25, an encoder 20, and a speed control circuit 21A for controlling an operation of the inverter. The speed control circuit 21A calculates output power of the inverter, and calculates discharging ability power of the power accumulating device on the basis of a measuring value of charging and discharging states. The speed control circuit 21A also calculates a limit power maximum value given by a sum of the discharging ability power and limit power of an AC power source, and changes speed commands on the basis of comparison of the output power of the inverter and the limit power maximum value.
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