Issues with the operating power of rotary vane blowers
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The company’s Roots blower has a power rating of 78 kW, a set frequency of 24 Hz, and an operating current of 130 A. Operating power calculated based on current: 1.732*380*130*0.9*0.85=65kw ； Operating power calculated by frequency: 78*（24/50）^3=8.6kw. Experts, could you give some advice? Is there something wrong with my algorithm? Is there a problem with the inverter?
The first formula seems plausible, but I don’t understand why the cube of the same frequency is proportional to it in the second formula The rotation speed changes, which affects the flow rate, but not the exhaust pressure (which is determined by the system pressure).
Is the operating current the current of the inverter, or the incoming current of the motor?