First, the mechanical cause of vibration motor noise
1. The rotor fixing parts are not tightened and there is looseness; 2. The static balance of the fan is not done or the precision is not enough;
3. The rotor is unbalanced without static and dynamic balance check; 4. The stator and rotor core are deformed;
5. The shaft is bent, and the rotor and the rotor are rubbed. 6. The anchor is unstable, the installation is not correct, and it is not strong.
7. The iron core and the iron core gear plate are loose; 8. The parts are processed differently, and the assembly tolerance is unreasonable;
9. The quality of the vibration motor assembly and installation is not good; 10. The end cap and bearing cap screw position are tightened or biased.
Second, how to judge the vibration motor noise is caused by mechanical reasons 1. When the noise is independent of the applied voltage and load current, it can be judged to be mechanical noise;
2. If the noise is unstable, high and low, it is mechanical noise.
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