在磨损轴承之间的孔隙过大；孔隙间距不够均匀；转子平衡不够；转轴弯曲；铁

Excessive porosity between worn bearings; not evenly spaced porosity; insufficient rotor balance; bent shaft; loose or altered core; uncorrected centering of couplings; unbalanced fan; insufficient casing strength or poor foundation; The motor anchor screw is loose; the cage rotor is open and welded; the wound rotor is open; the stator winding is faulty [7]. Troubleshooting: Overhaul bearings and replace if necessary; adjust apertures to make them uniform; correct rotor balance; correct shafts to be straight; correct overlapping cores; recalibrate Coupling or pulley; overhaul the fan, keep the fan in a balanced state, correct its geometry; further fix the casing; further fix the anchor screws, repair the rotor and stator windings.

Excessive pores between worn bearings; The pore spacing is not uniform enough; Insufficient rotor balance; Shaft bending; Loose iron core or shape change; The coupling center is not corrected; The fan cannot be balanced; Insufficient casing strength or poor foundation; The anchor screw of the motor is loose; Open welding and open circuit of cage rotor; Wound rotor open circuit; The stator winding is faulty [7]. Troubleshooting: overhaul the bearing and replace it if necessary; Adjust the pores to make them uniform; Correct the balance of the rotor; Correct the shaft to be straight; Correct overlapping cores; Recalibrate the coupling or pulley; Overhaul the fan, keep the fan in balance and correct its geometry; Further fixing the casing; Further fix the anchor screws and repair the rotor and stator windings.

Excessive porosity between worn bearings; Gap spacing is not uniform enough; Insufficient rotor balance; Rotating shaft bending; Loose iron core or shape change; The coupling center is not calibrated; The fan cannot be balanced; Insufficient casing strength or poor foundation; Loose foundation screws of motor; Open welding and open circuit of cage rotor; The winding rotor is broken; The stator winding is faulty [7]. Troubleshooting: overhaul the bearing and replace it if necessary; Adjust the pores to make them uniform; Correct the balance of the rotor; Correct the rotating shaft to be straight; Corrected overlapping iron cores; Recalibrate the coupling or pulley; Overhaul the fan to keep it in balance and correct its geometry; Further fixing the casing; Further fix the anchor screws and repair the rotor and stator windings.