What causes overcurrent in the motor?
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The currently in-use pump has a flow rate of 3.2 m3/h, a head of 160 m, and a motor power of 15 kW. When it is in use, the current at the pump outlet is 35.5 A. When the other pump is used, the current at the pump outlet is 29.2 A. After analyzing the reasons, it was found that there is no issue with the process flow; the pump shaft rotates very smoothly, with no signs of jamming.
The pump is fine; there’s no sticking issue, so the problem must lie with the quality of the motor
Based on the motor power you mentioned, the current in your motor should not exceed 20A; for a synchronous motor, the rated current is 22A. Check what the power factor of your motor is – in my opinion, the motor selected for you is too small
The rated current is 28.8A. Two new impellers have been installed; the diameter of these new impellers is 23.5 mm smaller than that of the old ones, but their flow channels are wider than those of the old impellers
Is your motor’s power factor 79%? What is the efficiency of the pump? Even if the efficiency is 50%, the power required by the pump is still 11,12 KW; there should be no issue with overcurrent
Is your motor’s power factor 79%? What is the efficiency of the pump? Even if the efficiency is 50%, the power required by the pump is still 11,12 KW; there should be no issue with overcurrent
1. Verify whether there are any changes in the density, temperature, and pressure of the process medium. 2. Check whether the safety factor of the motor meets the requirements. 3. Ensure that the pump itself is not worn out; just because it rotates easily does not necessarily mean there are no problems. 4. Check for any wear on the motor
There is an issue with the pump selection, resulting in operation at low flow rates.
The no-load loss of the motor itself is very low; the current, or power, comes from the device being driven. If there is an overcurrent, it is generally not related to the motor.