| 摘要 |
<P>PROBLEM TO BE SOLVED: To continuously supply AC power to each equipment such as cooling fan of a motor without using an uninterruptible power supply (UPS) or a DC/AC converting device even in the blackout in the AC source. <P>SOLUTION: In a control device for an elevator, three-phase AC supplied from the external AC source 1 is temporally converted into a direct current with a power converter 2, and the direct current is converted into an alternate current with an inverter 4 and is supplied to a motor 5 to moving up and down a car of the elevator. In case of blackout in the AC source 1, a part of the direct current from an accumulator 8 to a power converter 2 side of the inverter 4 is converted into the alternate current with the power converter 2 to drive the motor 5 through the inverter 4, and then the alternate current is supplied to a AC source circuit 25. <P>COPYRIGHT: (C)2007,JPO&INPIT |
