I measure MCSA before motor maintenance. we changed new sleeve bearing, clean, spray insulation then heat stator. After finished I measure MCSA again. I see some different:
1. At 1X: The peak (0.0375dB - after maintenance) is higher the peak (0.0228dB peak - before maintenance). I worry about unbalance rotor.
2. At 4.16Hz: the peak after maintenance decreased the peak before maintenance.
I need some recommendation from everyone.
Please see attached file