| 摘要 |
PURPOSE:To correspond to an electric power system control such as an automatic frequency control or the like, by permitting a regulation of a motor output in accordance with an external command signal while water is pumped up. CONSTITUTION:When a pump head H and a motor output command P0E are given, a motor output is given to a secondary winding phase angle calculation unit 16 so that a secondary winding excitation amount setting unit 17 sets an exciting amount of a secondary winding considering an actual rotational speed N and phase units 22a-23c control excitation for causing an actual motor output to coincide with the command signal. On the other hand, when the pump head H and the motor output command P0E are input, an optimum guide vane opening function generator 33 produces an optimum guide vane opening YOPT. A servo system 14 for operating a guide vane is controlled based on the output for regulating an amount of water passing through a pump. With this arrangement, operation is effected at a rotational speed of maximum efficiency which is different depending on an output.
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