The design and manufacturing of shaded pole motors have a significant impact on noise levels and can significantly reduce them. Here are some key aspects of the impact of design and manufacturing on noise levels:

1. Mechanical vibration control: Mechanical vibration of shaded pole motors is one of the main sources of noise. By optimizing the motor's bearings, rotor balance, and structural stiffness, the generation of mechanical vibration can be reduced, thereby reducing noise levels.

2. Magnetic field design: The motor's magnetic field also has an impact on noise. By optimizing the motor's magnetic field design and magnetic field distribution, the electromagnetic vibration and noise generation inside the motor can be reduced.

3. Material selection: Choosing the right material can reduce noise conduction and resonance. For example, using sound-absorbing materials or vibration-damping materials to reduce mechanical vibration and noise conduction.

4. Manufacturing quality control: Precision and quality control during the manufacturing process are also critical to noise levels. Ensure that the motor's components are accurately processed and assembled to reduce unnecessary friction and vibration.

5. Noise reduction technology: Using noise reduction technology around the motor and fan, such as soundproof covers, vibration isolation pads, etc., can effectively reduce noise transmission and external interference.

It should be noted that different motor design and manufacturing standards, material selection, and manufacturing quality control levels will have different effects on noise levels. Optimized design and precise manufacturing can significantly reduce the noise level of shaded pole motors. Manufacturers usually pay attention to noise control during product development and take corresponding measures to reduce noise levels and provide lower noise products.