Seek the formula for motor frequency conversion calculation
Thread Content
This post was last edited by flute6 on 2012-2-10 21:15. I want to add an inverter to the motor, but how? I still don’t know how to calculate it. So I’m asking everyone for help! ! All I know for now is that the differential pressure from the pump outlet to behind the control valve is 2.0 to 4.0 Mpa. What about me? I want to add an inverter to reduce the motor’s speed in order to compensate for this pressure difference. But adding a high-voltage inverter costs hundreds of thousands. If a variable frequency drive is used, only 70 kWh of electricity can be saved per hour to achieve the level I want. So I would like to verify the conversion relationships and formulas among the motor speed, the pump’s outlet pressure, and the current. Thank you, please help me out, all the teachers! !
Rotational speed n=60*f/P； f is the current frequency, P is the number of pole pairs; it represents the ratio of flow rates of pumps (the more precise the measurement is, the smaller the change in speed)
H1/H2=(n1/n2)^2 H----head n---rotations