| 摘要 |
<P>PROBLEM TO BE SOLVED: To offer a pump control method and a pump controller which does not affect a motor by the temperature rise of a pump drive motor even if the user varies the frequency to the second frequency (for example, 60Hz) being the maximum frequency the specified frequency higher than the first frequency, using a pump of the specified first frequency (for example, 50Hz). <P>SOLUTION: This pump controller possesses a control means which controls the rotational speed so that the current value of the pump drive motor may come to a preset current value or its vicinity. The control means possesses a function of speed-variably operating the pump for the specified first frequency (50Hz) until the second frequency (60Hz) the specified frequency higher than the first frequency, operating it at a certain voltage/frequency ratio α1 between 0Hz and the first frequency (50Hz), operating it at a voltage/frequency ratio (Vc/50), where the temperature rise of the pump drive motor becomes minimum, with the first frequency (50Hz), and operating it at a certain voltage/frequency ratio α2 between the first frequency (50Hz) and the second frequency (60Hz). <P>COPYRIGHT: (C)2005,JPO&NCIPI |
