1. Mechanical vibration: The irregular rotation of the generator rotor and the movement between the stator core can cause mechanical vibration, which is one of the main sources of generator knocking sound.
2. Electromagnetic induction: When the coils and magnetic field in the generator come into contact with a metal conductor, a brief magnetic field collapse occurs, which can cause internal vibrations in the body, leading to the generation of knocking sounds.
3. Piston knocking sound: When the piston switches between compression and power stroke, the direction of the axial force at its top changes, which may cause abnormal noise when knocking the cylinder.
4. Poor lubrication: Excessive oil sludge inside the engine, counterfeit engine oil, damaged oil pump, and other factors can lead to poor lubrication and may also cause knocking sounds.
5. Poor fuel quality: Using inferior or low-grade fuel can cause the engine to vibrate and produce knocking sounds.
The methods to reduce or eliminate knocking sounds include:
1. Replace faulty components: Replacing the spindle, bearings, or adjusting the air gap can reduce mechanical vibration.
2. Adjust the machine position: Placing the machine on a stable ground can reduce mechanical vibration and knocking sound.
3. Use vibration isolation measures: installing rubber pads, adjusting machine weight distribution, or using specially designed machine bases can effectively isolate vibrations.
4. Adjust the voltage and frequency of the generator: Professional personnel can reduce the knocking sound caused by electromagnetic induction by adjusting the voltage and frequency.
5. Inspection and maintenance: Regularly inspect and maintain the generator to avoid knocking sounds caused by parts wear or poor lubrication.
