| 摘要 |
PURPOSE: To enable to supply power to a plurality of sequentially continuing power feeder sections of a longitudinal stator motor provided with a power switch or a relay which is simply constituted at a low cost by using only one frequency converter for power conversion. CONSTITUTION: In the case of changeover from a first power feeder section 10 to a second power feeder section 20, a frequency converter 1 is first turned off. Next, a main contact 12 of the power switch or the relay which corresponds to the first power feeder section 10 is opened, and a main contact 22 of a power feeder switch relay which corresponds to the second power feeder section 20 is closed. After that, the frequency converter 1 is again turned off. |
