| 摘要 |
PURPOSE:To perform saving of energy by switching an inverter power supply to a commercial power supply on the halfway of up-operation of an elevator and the commercial power supply to the inverter power supply at the time of fixed speed clown-operation. CONSTITUTION:In the case of a transfer from accelerative up-operation to fixed speed up-operation after starting up-operation of an elevator and in the case of a transfer from accelerative down-operation to fixed speed down- operation after starting down-operation, a power supply of an electric motor 2 is switched from an inverter power supply 5 to a commercial power supply (frequency 50Hz or 60Hz)4. In the case of a transfer from fixed speed up- operation to decelerative up-operation and in the case of a transfer from fixed speed down-operation to decelerative down-operation, of the elevator, the power supply of the electric motor 2 is switched from the commercial power supply 4 to the inverter power supply 5. In this way, energy can be saved by enabling a loss of energy to decrease. |
