Air-cooled motor current decreases
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The motor of the air-cooled fan often experiences a decrease in current during normal operation. The normal current for a 37KW motor is 46A; when there are fluctuations, it drops to around 36A, and after some time it gradually increases again. Once the current decreases, the temperature after air cooling will rise immediately, affecting subsequent processes. Due to the high production load at the moment, it’s not possible to shut down the equipment for inspection; I’m asking experts to help analyze where the problem lies. This motor had its bearings replaced in May due to bearing damage.
Is this happening with a single motor or in batches? If it occurs in batches, it is likely a problem with the power grid; if it happens with just one unit, then there might be an issue with the motor.
Is the fan impeller angle adjustable? Because vibration causes changes in the blade angle, and the angle determines the motor load
It was a single motor; it had been operating normally for over a year before maintenance was performed