Reasons for reduced flow and increased speed in centrifugal pumps
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The characteristic curve of the centrifugal pump as determined shows that as the flow rate decreases, the rotational speed increases as well, by approximately 1 percent of the original speed (for example, from 2880 at the beginning to 2930 later on). The curve for flow rates ranging from 17 m^3/h to 4 shows a small increase, but it is indeed an upward trend
Is the speed controlled by flow or pressure?
This can be explained by the force balance within the motor’s coils. When the load decreases, the actual output power of the motor decreases. Since the voltage remains constant, the only change that can occur is a decrease in current. As the current decreases, the resistance exerted by the coils inside the motor on the magnetic field within the motor is reduced, and as a result, the speed increases. From a force perspective, this is the only way to achieve a state of equilibrium. Haha, I’m not sure if it’s correct; I suggest the original poster check the electrical section.