| 摘要 |
The present invention relates to a fluid machinery for generating a pressure by rotating an impeller with a motor. The fluid machinery has a frequency converter (F) for supplying electric power to the motor, a detector for detecting a frequency and a current value, and a program for specifying in advance the relationship between the frequency and the current value. A frequency and a current value in an actual operation are compared with the specified program, and the frequency generated by the frequency converter (F) is varied so that an operating point of the fluid machinery approaches the specified program. <IMAGE> |
