There may be many reasons why shaded-pole motors generate noise, including blade noise, electromagnetic vibration noise, mechanical resonance noise, etc. Here are some ways to reduce shaded-pole motor noise:

1. Optimize blade design: The blade is one of the main components that generate noise in shaded-pole motors. By optimizing the shape, size, and number of blades, the turbulence and noise between the blade and the air can be reduced.

2. Reduce electromagnetic vibration: Electromagnetic vibration is one of the reasons why motors generate noise when they are running. Taking some measures, such as increasing the thickness of the insulation layer of the stator and rotor and improving the balance of the stator and rotor, can reduce electromagnetic vibration and the corresponding noise.

3. Reduce mechanical resonance: Mechanical resonance is another common cause of noise. Mechanical resonance noise may be reduced by optimizing the structural design of the motor, reducing the occurrence of resonant frequencies, or adopting vibration reduction measures.

4. Use sound insulation materials: Using sound insulation materials in the motor housing and surrounding environment may effectively absorb and isolate noise and reduce the noise level transmitted to the surrounding environment.

5. Regular maintenance and lubrication: Regular maintenance and lubrication of the motor to ensure the good condition of the bearings and other running parts can reduce friction and mechanical noise.

6. Optimize the installation environment: Install the motor properly to avoid contact and resonance between the motor and other structures to reduce the possibility of conducted noise.

The above are some common methods to reduce the noise of shaded pole motors. The specific measures to be taken are determined according to the motor design and application environment. If the noise problem is serious, it is recommended to consult a professional engineer for detailed evaluation and solution formulation.