Pump consumption power calculation method at revolution per minute in inverter controlled water supply pump

摘要

The present invention relates to a method of calculating power consumption according to the number of revolutions of a feed pump controlled by an inverter. More particularly, the present invention relates to a pump for controlling the number of revolutions by using an inverter, wherein a plurality of flow rates, headings, and power consumption at the maximum number of revolutions of the pump are measured over the entire flow rate range, To a method of automatically calculating the power consumption by the number of revolutions of the motor. According to the present invention, even if only a plurality of performances (flow rate, head, power consumption) at the maximum number of revolutions are measured in a water supply pump that controls the number of revolutions by using an inverter, We want to provide a method of automatically calculating power consumption. To this end, in the present invention, a plurality of performance (flow rate, heading, power consumption) at the maximum rotational speed of the pump is measured and the power consumption for the rotational speed at an arbitrary heading is calculated by using the superposition principle of the pump. The degree of power consumption for the number of revolutions is the n-th order equation, and the degree n is obtained based on three reference points among a plurality of calculation points. Then, by completing the relational expression of the power consumption with respect to the number of revolutions, it is possible to obtain the power consumption with respect to the number of revolutions in an arbitrary head. The present invention can not only calculate the power and the electric power with respect to the number of revolutions of the pump but also calculate the power consumed by each pump in the case of a booster pump system composed of a plurality of pumps to control each pump more effectively Can be effective.