Single Phase Motor Humming Problem is the alternating magnetic field trying to move the rotor in both directions at the same time.
Reason No. 1
Testing of start circuit: A quick test for start winding failure I frequently use is wrap about 15 turns of string around the shaft, switch the motor on, and as its buzzing, very positively pull the loose end of the string till it comes off the shaft: This will give it the starting momentum and direction to run.
If the motor runs, there is a single phase motor humming problem with the start winding. Look at the capacitor located inside or near the connection box. The buzzing indicates that the RUN winding is good.
Reason No. 2
There may be the reason If the motor shaft cannot be easily turned, the following may apply:
The rotor is dragging on the Field laminations inside the Squirrel Cage. The bearings or Bushes could be worn, or, if the motor end shields were removed, they were not correctly put back on, and need to be lined up.
The load could also be either seized, jammed or be just too big.
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