| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic machine unit enabling energy conservation by avoiding waste with a relatively low cost frequency accommodation converter, and to protect the motor from overcurrent or overheat. SOLUTION: In this hydraulic machine unit, a frequency converter is connected to a hydraulic machine 103 driven by a motor 104. Presupposing that the hydraulic machine 103 is driven at a lower frequency than the rated frequency, a frequency converter the capacity of which is selected based on the electric capacity required in practical use at decelerating is used.
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