| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rotating speed switching controller for a plurality of motors which protects a circuit by securely operating a protective circuit, not only when a plurality of fan motors are arranged in a parallel-connected state (high-speed rotation state) but also in a series-connected state (low-speed rotation state). <P>SOLUTION: A control unit 10 is provided, by which rotating speeds of two fan motors 3, 4 are switched by switching the two fan motors 3, 4 to the series connection state and the parallel-connected state with a power circuit, and two kinds of fuses of different capacity, namely larger capacity fuses 5, 5 and a smaller capacity fuse 6, are provided in a switchable state as the protective circuit to intercept the power circuit, when the motors are locked. The switching controller is constituted so that the larger capacity fuses 5, 5 and the smaller capacity fuse 6 of the different capacity in the protective circuit may be switched, interlocked with a switching command by the controller 10 between the series-connected state and the parallel-connected state. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
