What causes the motor to make intermittent unusual noises?
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During today’s electrical inspector’s check, intermittent abnormal noises were detected on the motor side. The approximate sound description is a hiss, hiss... The sound occurs about once every 1 second, intermittently. What’s going on with this issue, everyone?
We have encountered this problem as well; by replacing the bearings at both ends of the motor, things returned to normal. However, it’s not clear whether it’s the same type of fault
The motor bearing is probably damaged; otherwise, it could be that the motor rotor is rubbing against the casing, or the cooling fan is causing friction. Let’s analyze each possibility one by one
The noise stopped in the afternoon, so I asked the electrical engineer. It turned out it was due to a lack of oil; I checked the records and saw that it hadn’t been refueled for a long time
Sound source: front bearing of the motor. I originally thought the same thing
I don’t understand motors that well; my experience in working with them comes from dealing with those bearings. If everything is taken care of properly, there should be no problems. If not, just apply more grease. Don’t try to listen to the sound the motor makes at the beginning of winter – wait until it gets warmer before checking it. The vibration analyzer is completely useless; if it indicates a problem, you can then report it for repair. For early fault detection, you can use something like the BH550 from Bohua Technology – it’s more reliable than human ears