| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverter-drive rotary compressor wherein a highly developed rotation-speed control of a screw compressor can be performed even though the input/output accuracy of the controller is not high, and the operation time is comparatively long. SOLUTION: In the controller A, discharge pressure of the compressor 7 is detected by a pressure sensor 13, and a power-supply frequency command is output to an inverter 3 by rotational speed control. In the rotational speed control, PID or PI control is mainly performed, and a plurality of operations is performed. COPYRIGHT: (C)2008,JPO&INPIT
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