Reply to "High Vibration Problem at Raw Mill Motor"

I must say I suspect two other options rather then bearing frequency:

- something is exciting your motor from the side of the gearbox / planetary gearbox, 50 teeth for sun gear sounds a low number, you also have to check the planetary teeth rotation speed

- or there is some electric fault weakness on the motor but I don't understand how is it possible that the line frequency is fluctuating?? OK, rotation frequency, but line frequency should be constant at 50 Hz 

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