Classification of Motor Noise
What is noise
From a physics perspective, noise is a combination of many uncoordinated or irregular residual sounds. Noise not only affects people's work and rest, but also makes them restless and annoying; It may even harm the health of guests, cause deafness, or lead to various other diseases. At present, industrial noise has become one of the three major environmental pollutants (sewage, exhaust gas, noise). With the development of industry, in order to ensure a suitable working environment and people's health, certain measures must be taken to reduce the noise to within the allowable limit.
The electromagnetic noise, ventilation noise, mechanical noise, and their main vibration sources generated in the motor are summarized and appropriately discussed.
The root cause of electromagnetic noise is the vibration and resonance generated in the iron core and its associated mechanical components due to the alternating electromagnetic force caused by various harmonic magnetic fields in the air gap of the motor. Mechanical noise is the periodic or non periodic mechanical impact or vibration generated by the friction between motor related components.
Aerodynamic noise includes three types: broadband noise, whistle sound, and whistling sound. Broadband noise is the noise generated by the disturbance of gas caused by vortices during the rotation of structural components in gas; The whistle sound is the noise generated by the relative movement between the stator and rotor; Whistle sound is noise generated by resonance interference in gaps, while whistle sound and whistle sound are emitted due to the periodic fluctuations of gases.
