Causes of abnormal noise in automobile generators from Pacific Automotive Network: 1. Generator V-belt slips 2. Generator bearings damaged 3. Rotor and stator collide forward; fan blades and front cover collision.
Metal friction noise is mainly caused by the damage of the bearing, or the friction noise of the bearing sleeve and housing; Vibration noise is caused by bearing aging, a loose, unbalanced foundation. Improper rotor and connecting shaft. Poor coordination, crankcase cracking, etc. ; buzzing, general overload, two elements, short circuit between turns, etc.
If it is a variable frequency motor, the frequency may be too high and the mechanical resonance point cannot be avoided. If there is no frequency converter, you must first determine whether the abnormal noise comes from the motor or fromu mechanical noise caused by the motor. Abnormal noise in the engine can be caused by a broken fan and severe bearing wear due to lack of oil. If the motor rotor shaft does not rotate but the motor makes abnormal noise, then it is sure that the rotor shaft and motor are damaged. The rotor windings (cast aluminum squirrel rotor) are loose.
To distinguish electromagnetic noise, mechanical noise or ventilation noise, the step-by-step operation method is generally used to distinguish, that is, disconnect a certain moving part to analyze the source of noise, for example. the noise generated by disconnecting the fan is electromagnetic noise or mechanical noise, then turn off the power supply, if the noise persists at the end, it can be determined as mechanical noise.
(Photo/Text/Photo: Pacific Automotive Network Q&A)
The reasons for abnormal noise are as follows:
1. the diesel generator The fan blades are vibrating and the rivets between the blades and the fan blade hub are loose. The fan mounting screw is loose. Cracks developed at the roots of the fan blades, changing the pitch angle of the blades. Broken fan blades, etc.
2. It means that the fan pulley fixing bolts are loose or the screws fixing the fan are loose and need to be welded or replaced in time.